gdb/s390-tdep.c - Issue 124383005: GDB 7.6.50

Unified Diff: gdb/s390-tdep.c

Issue 124383005: GDB 7.6.50 (Closed) Base URL: http://git.chromium.org/native_client/nacl-gdb.git@upstream

Patch Set: Created 6 years, 11 months ago

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Index: gdb/s390-tdep.c

diff --git a/gdb/s390-tdep.c b/gdb/s390-tdep.c

deleted file mode 100644

index 620eaea7d58b925408d1f519e3c365d62c6210df..0000000000000000000000000000000000000000

--- a/gdb/s390-tdep.c

+++ /dev/null

@@ -1,3331 +0,0 @@

-/* Target-dependent code for GDB, the GNU debugger.

- Contributed by D.J. Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)

- for IBM Deutschland Entwicklung GmbH, IBM Corporation.

- This file is part of GDB.

- This program is free software; you can redistribute it and/or modify

- it under the terms of the GNU General Public License as published by

- the Free Software Foundation; either version 3 of the License, or

- (at your option) any later version.

- This program is distributed in the hope that it will be useful,

- but WITHOUT ANY WARRANTY; without even the implied warranty of

- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

- GNU General Public License for more details.

- You should have received a copy of the GNU General Public License

- along with this program. If not, see <http://www.gnu.org/licenses/>. */

-#include "defs.h"

-#include "arch-utils.h"

-#include "frame.h"

-#include "inferior.h"

-#include "symtab.h"

-#include "target.h"

-#include "gdbcore.h"

-#include "gdbcmd.h"

-#include "objfiles.h"

-#include "floatformat.h"

-#include "regcache.h"

-#include "trad-frame.h"

-#include "frame-base.h"

-#include "frame-unwind.h"

-#include "dwarf2-frame.h"

-#include "reggroups.h"

-#include "regset.h"

-#include "value.h"

-#include "gdb_assert.h"

-#include "dis-asm.h"

-#include "solib-svr4.h"

-#include "prologue-value.h"

-#include "linux-tdep.h"

-#include "s390-tdep.h"

-#include "stap-probe.h"

-#include "ax.h"

-#include "ax-gdb.h"

-#include "user-regs.h"

-#include "cli/cli-utils.h"

-#include <ctype.h>

-#include "features/s390-linux32.c"

-#include "features/s390-linux32v1.c"

-#include "features/s390-linux32v2.c"

-#include "features/s390-linux64.c"

-#include "features/s390-linux64v1.c"

-#include "features/s390-linux64v2.c"

-#include "features/s390x-linux64.c"

-#include "features/s390x-linux64v1.c"

-#include "features/s390x-linux64v2.c"

-/* The tdep structure. */

-struct gdbarch_tdep

- /* ABI version. */

- enum { ABI_LINUX_S390, ABI_LINUX_ZSERIES } abi;

- /* Pseudo register numbers. */

- int gpr_full_regnum;

- int pc_regnum;

- int cc_regnum;

- /* Core file register sets. */

- const struct regset *gregset;

- int sizeof_gregset;

- const struct regset *fpregset;

- int sizeof_fpregset;

-};

-/* ABI call-saved register information. */

-static int

-s390_register_call_saved (struct gdbarch *gdbarch, int regnum)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- switch (tdep->abi)

- {

- case ABI_LINUX_S390:

- if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)

- || regnum == S390_F4_REGNUM || regnum == S390_F6_REGNUM

- || regnum == S390_A0_REGNUM)

- return 1;

- break;

- case ABI_LINUX_ZSERIES:

- if ((regnum >= S390_R6_REGNUM && regnum <= S390_R15_REGNUM)

- || (regnum >= S390_F8_REGNUM && regnum <= S390_F15_REGNUM)

- || (regnum >= S390_A0_REGNUM && regnum <= S390_A1_REGNUM))

- return 1;

- break;

- }

- return 0;

-static int

-s390_cannot_store_register (struct gdbarch *gdbarch, int regnum)

- /* The last-break address is read-only. */

- return regnum == S390_LAST_BREAK_REGNUM;

-static void

-s390_write_pc (struct regcache *regcache, CORE_ADDR pc)

- struct gdbarch *gdbarch = get_regcache_arch (regcache);

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);

- /* Set special SYSTEM_CALL register to 0 to prevent the kernel from

- messing with the PC we just installed, if we happen to be within

- an interrupted system call that the kernel wants to restart.

- Note that after we return from the dummy call, the SYSTEM_CALL and

- ORIG_R2 registers will be automatically restored, and the kernel

- continues to restart the system call at this point. */

- if (register_size (gdbarch, S390_SYSTEM_CALL_REGNUM) > 0)

- regcache_cooked_write_unsigned (regcache, S390_SYSTEM_CALL_REGNUM, 0);

-/* DWARF Register Mapping. */

-static int s390_dwarf_regmap[] =

- /* General Purpose Registers. */

- S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,

- S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,

- S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,

- S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,

- /* Floating Point Registers. */

- S390_F0_REGNUM, S390_F2_REGNUM, S390_F4_REGNUM, S390_F6_REGNUM,

- S390_F1_REGNUM, S390_F3_REGNUM, S390_F5_REGNUM, S390_F7_REGNUM,

- S390_F8_REGNUM, S390_F10_REGNUM, S390_F12_REGNUM, S390_F14_REGNUM,

- S390_F9_REGNUM, S390_F11_REGNUM, S390_F13_REGNUM, S390_F15_REGNUM,

- /* Control Registers (not mapped). */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Access Registers. */

- S390_A0_REGNUM, S390_A1_REGNUM, S390_A2_REGNUM, S390_A3_REGNUM,

- S390_A4_REGNUM, S390_A5_REGNUM, S390_A6_REGNUM, S390_A7_REGNUM,

- S390_A8_REGNUM, S390_A9_REGNUM, S390_A10_REGNUM, S390_A11_REGNUM,

- S390_A12_REGNUM, S390_A13_REGNUM, S390_A14_REGNUM, S390_A15_REGNUM,

- /* Program Status Word. */

- S390_PSWM_REGNUM,

- S390_PSWA_REGNUM,

- /* GPR Lower Half Access. */

- S390_R0_REGNUM, S390_R1_REGNUM, S390_R2_REGNUM, S390_R3_REGNUM,

- S390_R4_REGNUM, S390_R5_REGNUM, S390_R6_REGNUM, S390_R7_REGNUM,

- S390_R8_REGNUM, S390_R9_REGNUM, S390_R10_REGNUM, S390_R11_REGNUM,

- S390_R12_REGNUM, S390_R13_REGNUM, S390_R14_REGNUM, S390_R15_REGNUM,

- /* GNU/Linux-specific registers (not mapped). */

- -1, -1, -1,

-};

-/* Convert DWARF register number REG to the appropriate register

- number used by GDB. */

-static int

-s390_dwarf_reg_to_regnum (struct gdbarch *gdbarch, int reg)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- /* In a 32-on-64 debug scenario, debug info refers to the full 64-bit

- GPRs. Note that call frame information still refers to the 32-bit

- lower halves, because s390_adjust_frame_regnum uses register numbers

- 66 .. 81 to access GPRs. */

- if (tdep->gpr_full_regnum != -1 && reg >= 0 && reg < 16)

- return tdep->gpr_full_regnum + reg;

- if (reg >= 0 && reg < ARRAY_SIZE (s390_dwarf_regmap))

- return s390_dwarf_regmap[reg];

- warning (_("Unmapped DWARF Register #%d encountered."), reg);

- return -1;

-/* Translate a .eh_frame register to DWARF register, or adjust a

- .debug_frame register. */

-static int

-s390_adjust_frame_regnum (struct gdbarch *gdbarch, int num, int eh_frame_p)

- /* See s390_dwarf_reg_to_regnum for comments. */

- return (num >= 0 && num < 16)? num + 66 : num;

-/* Pseudo registers. */

-static const char *

-s390_pseudo_register_name (struct gdbarch *gdbarch, int regnum)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- if (regnum == tdep->pc_regnum)

- return "pc";

- if (regnum == tdep->cc_regnum)

- return "cc";

- if (tdep->gpr_full_regnum != -1

- && regnum >= tdep->gpr_full_regnum

- && regnum < tdep->gpr_full_regnum + 16)

- {

- static const char *full_name[] = {

- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",

- "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"

- };

- return full_name[regnum - tdep->gpr_full_regnum];

- }

- internal_error (__FILE__, __LINE__, _("invalid regnum"));

-static struct type *

-s390_pseudo_register_type (struct gdbarch *gdbarch, int regnum)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- if (regnum == tdep->pc_regnum)

- return builtin_type (gdbarch)->builtin_func_ptr;

- if (regnum == tdep->cc_regnum)

- return builtin_type (gdbarch)->builtin_int;

- if (tdep->gpr_full_regnum != -1

- && regnum >= tdep->gpr_full_regnum

- && regnum < tdep->gpr_full_regnum + 16)

- return builtin_type (gdbarch)->builtin_uint64;

- internal_error (__FILE__, __LINE__, _("invalid regnum"));

-static enum register_status

-s390_pseudo_register_read (struct gdbarch *gdbarch, struct regcache *regcache,

- int regnum, gdb_byte *buf)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

- int regsize = register_size (gdbarch, regnum);

- ULONGEST val;

- if (regnum == tdep->pc_regnum)

- {

- enum register_status status;

- status = regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &val);

- if (status == REG_VALID)

- {

- if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)

- val &= 0x7fffffff;

- store_unsigned_integer (buf, regsize, byte_order, val);

- }

- return status;

- }

- if (regnum == tdep->cc_regnum)

- {

- enum register_status status;

- status = regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &val);

- if (status == REG_VALID)

- {

- if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)

- val = (val >> 12) & 3;

- else

- val = (val >> 44) & 3;

- store_unsigned_integer (buf, regsize, byte_order, val);

- }

- return status;

- }

- if (tdep->gpr_full_regnum != -1

- && regnum >= tdep->gpr_full_regnum

- && regnum < tdep->gpr_full_regnum + 16)

- {

- enum register_status status;

- ULONGEST val_upper;

- regnum -= tdep->gpr_full_regnum;

- status = regcache_raw_read_unsigned (regcache, S390_R0_REGNUM + regnum, &val);

- if (status == REG_VALID)

- status = regcache_raw_read_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,

- &val_upper);

- if (status == REG_VALID)

- {

- val |= val_upper << 32;

- store_unsigned_integer (buf, regsize, byte_order, val);

- }

- return status;

- }

- internal_error (__FILE__, __LINE__, _("invalid regnum"));

-static void

-s390_pseudo_register_write (struct gdbarch *gdbarch, struct regcache *regcache,

- int regnum, const gdb_byte *buf)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

- int regsize = register_size (gdbarch, regnum);

- ULONGEST val, psw;

- if (regnum == tdep->pc_regnum)

- {

- val = extract_unsigned_integer (buf, regsize, byte_order);

- if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)

- {

- regcache_raw_read_unsigned (regcache, S390_PSWA_REGNUM, &psw);

- val = (psw & 0x80000000) | (val & 0x7fffffff);

- }

- regcache_raw_write_unsigned (regcache, S390_PSWA_REGNUM, val);

- return;

- }

- if (regnum == tdep->cc_regnum)

- {

- val = extract_unsigned_integer (buf, regsize, byte_order);

- regcache_raw_read_unsigned (regcache, S390_PSWM_REGNUM, &psw);

- if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)

- val = (psw & ~((ULONGEST)3 << 12)) | ((val & 3) << 12);

- else

- val = (psw & ~((ULONGEST)3 << 44)) | ((val & 3) << 44);

- regcache_raw_write_unsigned (regcache, S390_PSWM_REGNUM, val);

- return;

- }

- if (tdep->gpr_full_regnum != -1

- && regnum >= tdep->gpr_full_regnum

- && regnum < tdep->gpr_full_regnum + 16)

- {

- regnum -= tdep->gpr_full_regnum;

- val = extract_unsigned_integer (buf, regsize, byte_order);

- regcache_raw_write_unsigned (regcache, S390_R0_REGNUM + regnum,

- val & 0xffffffff);

- regcache_raw_write_unsigned (regcache, S390_R0_UPPER_REGNUM + regnum,

- val >> 32);

- return;

- }

- internal_error (__FILE__, __LINE__, _("invalid regnum"));

-/* 'float' values are stored in the upper half of floating-point

- registers, even though we are otherwise a big-endian platform. */

-static struct value *

-s390_value_from_register (struct type *type, int regnum,

- struct frame_info *frame)

- struct value *value = default_value_from_register (type, regnum, frame);

- int len = TYPE_LENGTH (check_typedef (type));

- if (regnum >= S390_F0_REGNUM && regnum <= S390_F15_REGNUM && len < 8)

- set_value_offset (value, 0);

- return value;

-/* Register groups. */

-static int

-s390_pseudo_register_reggroup_p (struct gdbarch *gdbarch, int regnum,

- struct reggroup *group)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- /* We usually save/restore the whole PSW, which includes PC and CC.

- However, some older gdbservers may not support saving/restoring

- the whole PSW yet, and will return an XML register description

- excluding those from the save/restore register groups. In those

- cases, we still need to explicitly save/restore PC and CC in order

- to push or pop frames. Since this doesn't hurt anything if we

- already save/restore the whole PSW (it's just redundant), we add

- PC and CC at this point unconditionally. */

- if (group == save_reggroup || group == restore_reggroup)

- return regnum == tdep->pc_regnum || regnum == tdep->cc_regnum;

- return default_register_reggroup_p (gdbarch, regnum, group);

-/* Core file register sets. */

-int s390_regmap_gregset[S390_NUM_REGS] =

- /* Program Status Word. */

- 0x00, 0x04,

- /* General Purpose Registers. */

- 0x08, 0x0c, 0x10, 0x14,

- 0x18, 0x1c, 0x20, 0x24,

- 0x28, 0x2c, 0x30, 0x34,

- 0x38, 0x3c, 0x40, 0x44,

- /* Access Registers. */

- 0x48, 0x4c, 0x50, 0x54,

- 0x58, 0x5c, 0x60, 0x64,

- 0x68, 0x6c, 0x70, 0x74,

- 0x78, 0x7c, 0x80, 0x84,

- /* Floating Point Control Word. */

- -1,

- /* Floating Point Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GPR Uppper Halves. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GNU/Linux-specific optional "registers". */

- 0x88, -1, -1,

-};

-int s390x_regmap_gregset[S390_NUM_REGS] =

- /* Program Status Word. */

- 0x00, 0x08,

- /* General Purpose Registers. */

- 0x10, 0x18, 0x20, 0x28,

- 0x30, 0x38, 0x40, 0x48,

- 0x50, 0x58, 0x60, 0x68,

- 0x70, 0x78, 0x80, 0x88,

- /* Access Registers. */

- 0x90, 0x94, 0x98, 0x9c,

- 0xa0, 0xa4, 0xa8, 0xac,

- 0xb0, 0xb4, 0xb8, 0xbc,

- 0xc0, 0xc4, 0xc8, 0xcc,

- /* Floating Point Control Word. */

- -1,

- /* Floating Point Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GPR Uppper Halves. */

- 0x10, 0x18, 0x20, 0x28,

- 0x30, 0x38, 0x40, 0x48,

- 0x50, 0x58, 0x60, 0x68,

- 0x70, 0x78, 0x80, 0x88,

- /* GNU/Linux-specific optional "registers". */

- 0xd0, -1, -1,

-};

-int s390_regmap_fpregset[S390_NUM_REGS] =

- /* Program Status Word. */

- -1, -1,

- /* General Purpose Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Access Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Floating Point Control Word. */

- 0x00,

- /* Floating Point Registers. */

- 0x08, 0x10, 0x18, 0x20,

- 0x28, 0x30, 0x38, 0x40,

- 0x48, 0x50, 0x58, 0x60,

- 0x68, 0x70, 0x78, 0x80,

- /* GPR Uppper Halves. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GNU/Linux-specific optional "registers". */

- -1, -1, -1,

-};

-int s390_regmap_upper[S390_NUM_REGS] =

- /* Program Status Word. */

- -1, -1,

- /* General Purpose Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Access Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Floating Point Control Word. */

- -1,

- /* Floating Point Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GPR Uppper Halves. */

- 0x00, 0x04, 0x08, 0x0c,

- 0x10, 0x14, 0x18, 0x1c,

- 0x20, 0x24, 0x28, 0x2c,

- 0x30, 0x34, 0x38, 0x3c,

- /* GNU/Linux-specific optional "registers". */

- -1, -1, -1,

-};

-int s390_regmap_last_break[S390_NUM_REGS] =

- /* Program Status Word. */

- -1, -1,

- /* General Purpose Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Access Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Floating Point Control Word. */

- -1,

- /* Floating Point Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GPR Uppper Halves. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GNU/Linux-specific optional "registers". */

- -1, 4, -1,

-};

-int s390x_regmap_last_break[S390_NUM_REGS] =

- /* Program Status Word. */

- -1, -1,

- /* General Purpose Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Access Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Floating Point Control Word. */

- -1,

- /* Floating Point Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GPR Uppper Halves. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GNU/Linux-specific optional "registers". */

- -1, 0, -1,

-};

-int s390_regmap_system_call[S390_NUM_REGS] =

- /* Program Status Word. */

- -1, -1,

- /* General Purpose Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Access Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* Floating Point Control Word. */

- -1,

- /* Floating Point Registers. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GPR Uppper Halves. */

- -1, -1, -1, -1, -1, -1, -1, -1,

- /* GNU/Linux-specific optional "registers". */

- -1, -1, 0,

-};

-/* Supply register REGNUM from the register set REGSET to register cache

- REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */

-static void

-s390_supply_regset (const struct regset *regset, struct regcache *regcache,

- int regnum, const void *regs, size_t len)

- const int *offset = regset->descr;

- int i;

- for (i = 0; i < S390_NUM_REGS; i++)

- {

- if ((regnum == i || regnum == -1) && offset[i] != -1)

- regcache_raw_supply (regcache, i, (const char *)regs + offset[i]);

- }

-/* Collect register REGNUM from the register cache REGCACHE and store

- it in the buffer specified by REGS and LEN as described by the

- general-purpose register set REGSET. If REGNUM is -1, do this for

- all registers in REGSET. */

-static void

-s390_collect_regset (const struct regset *regset,

- const struct regcache *regcache,

- int regnum, void *regs, size_t len)

- const int *offset = regset->descr;

- int i;

- for (i = 0; i < S390_NUM_REGS; i++)

- {

- if ((regnum == i || regnum == -1) && offset[i] != -1)

- regcache_raw_collect (regcache, i, (char *)regs + offset[i]);

- }

-static const struct regset s390_gregset = {

- s390_regmap_gregset,

- s390_supply_regset,

- s390_collect_regset

-};

-static const struct regset s390x_gregset = {

- s390x_regmap_gregset,

- s390_supply_regset,

- s390_collect_regset

-};

-static const struct regset s390_fpregset = {

- s390_regmap_fpregset,

- s390_supply_regset,

- s390_collect_regset

-};

-static const struct regset s390_upper_regset = {

- s390_regmap_upper,

- s390_supply_regset,

- s390_collect_regset

-};

-static const struct regset s390_last_break_regset = {

- s390_regmap_last_break,

- s390_supply_regset,

- s390_collect_regset

-};

-static const struct regset s390x_last_break_regset = {

- s390x_regmap_last_break,

- s390_supply_regset,

- s390_collect_regset

-};

-static const struct regset s390_system_call_regset = {

- s390_regmap_system_call,

- s390_supply_regset,

- s390_collect_regset

-};

-static struct core_regset_section s390_linux32_regset_sections[] =

- { ".reg", s390_sizeof_gregset, "general-purpose" },

- { ".reg2", s390_sizeof_fpregset, "floating-point" },

- { NULL, 0}

-};

-static struct core_regset_section s390_linux32v1_regset_sections[] =

- { ".reg", s390_sizeof_gregset, "general-purpose" },

- { ".reg2", s390_sizeof_fpregset, "floating-point" },

- { ".reg-s390-last-break", 8, "s390 last-break address" },

- { NULL, 0}

-};

-static struct core_regset_section s390_linux32v2_regset_sections[] =

- { ".reg", s390_sizeof_gregset, "general-purpose" },

- { ".reg2", s390_sizeof_fpregset, "floating-point" },

- { ".reg-s390-last-break", 8, "s390 last-break address" },

- { ".reg-s390-system-call", 4, "s390 system-call" },

- { NULL, 0}

-};

-static struct core_regset_section s390_linux64_regset_sections[] =

- { ".reg", s390_sizeof_gregset, "general-purpose" },

- { ".reg2", s390_sizeof_fpregset, "floating-point" },

- { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },

- { NULL, 0}

-};

-static struct core_regset_section s390_linux64v1_regset_sections[] =

- { ".reg", s390_sizeof_gregset, "general-purpose" },

- { ".reg2", s390_sizeof_fpregset, "floating-point" },

- { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },

- { ".reg-s390-last-break", 8, "s930 last-break address" },

- { NULL, 0}

-};

-static struct core_regset_section s390_linux64v2_regset_sections[] =

- { ".reg", s390_sizeof_gregset, "general-purpose" },

- { ".reg2", s390_sizeof_fpregset, "floating-point" },

- { ".reg-s390-high-gprs", 16*4, "s390 GPR upper halves" },

- { ".reg-s390-last-break", 8, "s930 last-break address" },

- { ".reg-s390-system-call", 4, "s390 system-call" },

- { NULL, 0}

-};

-static struct core_regset_section s390x_linux64_regset_sections[] =

- { ".reg", s390x_sizeof_gregset, "general-purpose" },

- { ".reg2", s390_sizeof_fpregset, "floating-point" },

- { NULL, 0}

-};

-static struct core_regset_section s390x_linux64v1_regset_sections[] =

- { ".reg", s390x_sizeof_gregset, "general-purpose" },

- { ".reg2", s390_sizeof_fpregset, "floating-point" },

- { ".reg-s390-last-break", 8, "s930 last-break address" },

- { NULL, 0}

-};

-static struct core_regset_section s390x_linux64v2_regset_sections[] =

- { ".reg", s390x_sizeof_gregset, "general-purpose" },

- { ".reg2", s390_sizeof_fpregset, "floating-point" },

- { ".reg-s390-last-break", 8, "s930 last-break address" },

- { ".reg-s390-system-call", 4, "s390 system-call" },

- { NULL, 0}

-};

-/* Return the appropriate register set for the core section identified

- by SECT_NAME and SECT_SIZE. */

-static const struct regset *

-s390_regset_from_core_section (struct gdbarch *gdbarch,

- const char *sect_name, size_t sect_size)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- if (strcmp (sect_name, ".reg") == 0 && sect_size >= tdep->sizeof_gregset)

- return tdep->gregset;

- if (strcmp (sect_name, ".reg2") == 0 && sect_size >= tdep->sizeof_fpregset)

- return tdep->fpregset;

- if (strcmp (sect_name, ".reg-s390-high-gprs") == 0 && sect_size >= 16*4)

- return &s390_upper_regset;

- if (strcmp (sect_name, ".reg-s390-last-break") == 0 && sect_size >= 8)

- return (gdbarch_ptr_bit (gdbarch) == 32

- ? &s390_last_break_regset : &s390x_last_break_regset);

- if (strcmp (sect_name, ".reg-s390-system-call") == 0 && sect_size >= 4)

- return &s390_system_call_regset;

- return NULL;

-static const struct target_desc *

-s390_core_read_description (struct gdbarch *gdbarch,

- struct target_ops *target, bfd *abfd)

- asection *high_gprs = bfd_get_section_by_name (abfd, ".reg-s390-high-gprs");

- asection *v1 = bfd_get_section_by_name (abfd, ".reg-s390-last-break");

- asection *v2 = bfd_get_section_by_name (abfd, ".reg-s390-system-call");

- asection *section = bfd_get_section_by_name (abfd, ".reg");

- if (!section)

- return NULL;

- switch (bfd_section_size (abfd, section))

- {

- case s390_sizeof_gregset:

- if (high_gprs)

- return (v2? tdesc_s390_linux64v2 :

- v1? tdesc_s390_linux64v1 : tdesc_s390_linux64);

- else

- return (v2? tdesc_s390_linux32v2 :

- v1? tdesc_s390_linux32v1 : tdesc_s390_linux32);

- case s390x_sizeof_gregset:

- return (v2? tdesc_s390x_linux64v2 :

- v1? tdesc_s390x_linux64v1 : tdesc_s390x_linux64);

- default:

- return NULL;

- }

-/* Decoding S/390 instructions. */

-/* Named opcode values for the S/390 instructions we recognize. Some

- instructions have their opcode split across two fields; those are the

- op1_* and op2_* enums. */

-enum

- {

- op1_lhi = 0xa7, op2_lhi = 0x08,

- op1_lghi = 0xa7, op2_lghi = 0x09,

- op1_lgfi = 0xc0, op2_lgfi = 0x01,

- op_lr = 0x18,

- op_lgr = 0xb904,

- op_l = 0x58,

- op1_ly = 0xe3, op2_ly = 0x58,

- op1_lg = 0xe3, op2_lg = 0x04,

- op_lm = 0x98,

- op1_lmy = 0xeb, op2_lmy = 0x98,

- op1_lmg = 0xeb, op2_lmg = 0x04,

- op_st = 0x50,

- op1_sty = 0xe3, op2_sty = 0x50,

- op1_stg = 0xe3, op2_stg = 0x24,

- op_std = 0x60,

- op_stm = 0x90,

- op1_stmy = 0xeb, op2_stmy = 0x90,

- op1_stmg = 0xeb, op2_stmg = 0x24,

- op1_aghi = 0xa7, op2_aghi = 0x0b,

- op1_ahi = 0xa7, op2_ahi = 0x0a,

- op1_agfi = 0xc2, op2_agfi = 0x08,

- op1_afi = 0xc2, op2_afi = 0x09,

- op1_algfi= 0xc2, op2_algfi= 0x0a,

- op1_alfi = 0xc2, op2_alfi = 0x0b,

- op_ar = 0x1a,

- op_agr = 0xb908,

- op_a = 0x5a,

- op1_ay = 0xe3, op2_ay = 0x5a,

- op1_ag = 0xe3, op2_ag = 0x08,

- op1_slgfi= 0xc2, op2_slgfi= 0x04,

- op1_slfi = 0xc2, op2_slfi = 0x05,

- op_sr = 0x1b,

- op_sgr = 0xb909,

- op_s = 0x5b,

- op1_sy = 0xe3, op2_sy = 0x5b,

- op1_sg = 0xe3, op2_sg = 0x09,

- op_nr = 0x14,

- op_ngr = 0xb980,

- op_la = 0x41,

- op1_lay = 0xe3, op2_lay = 0x71,

- op1_larl = 0xc0, op2_larl = 0x00,

- op_basr = 0x0d,

- op_bas = 0x4d,

- op_bcr = 0x07,

- op_bc = 0x0d,

- op_bctr = 0x06,

- op_bctgr = 0xb946,

- op_bct = 0x46,

- op1_bctg = 0xe3, op2_bctg = 0x46,

- op_bxh = 0x86,

- op1_bxhg = 0xeb, op2_bxhg = 0x44,

- op_bxle = 0x87,

- op1_bxleg= 0xeb, op2_bxleg= 0x45,

- op1_bras = 0xa7, op2_bras = 0x05,

- op1_brasl= 0xc0, op2_brasl= 0x05,

- op1_brc = 0xa7, op2_brc = 0x04,

- op1_brcl = 0xc0, op2_brcl = 0x04,

- op1_brct = 0xa7, op2_brct = 0x06,

- op1_brctg= 0xa7, op2_brctg= 0x07,

- op_brxh = 0x84,

- op1_brxhg= 0xec, op2_brxhg= 0x44,

- op_brxle = 0x85,

- op1_brxlg= 0xec, op2_brxlg= 0x45,

- };

-/* Read a single instruction from address AT. */

-#define S390_MAX_INSTR_SIZE 6

-static int

-s390_readinstruction (bfd_byte instr[], CORE_ADDR at)

- static int s390_instrlen[] = { 2, 4, 4, 6 };

- int instrlen;

- if (target_read_memory (at, &instr[0], 2))

- return -1;

- instrlen = s390_instrlen[instr[0] >> 6];

- if (instrlen > 2)

- {

- if (target_read_memory (at + 2, &instr[2], instrlen - 2))

- return -1;

- }

- return instrlen;

-/* The functions below are for recognizing and decoding S/390

- instructions of various formats. Each of them checks whether INSN

- is an instruction of the given format, with the specified opcodes.

- If it is, it sets the remaining arguments to the values of the

- instruction's fields, and returns a non-zero value; otherwise, it

- returns zero.

- These functions' arguments appear in the order they appear in the

- instruction, not in the machine-language form. So, opcodes always

- come first, even though they're sometimes scattered around the

- instructions. And displacements appear before base and extension

- registers, as they do in the assembly syntax, not at the end, as

- they do in the machine language. */

-static int

-is_ri (bfd_byte *insn, int op1, int op2, unsigned int *r1, int *i2)

- if (insn[0] == op1 && (insn[1] & 0xf) == op2)

- {

- *r1 = (insn[1] >> 4) & 0xf;

- /* i2 is a 16-bit signed quantity. */

- *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;

- return 1;

- }

- else

- return 0;

-static int

-is_ril (bfd_byte *insn, int op1, int op2,

- unsigned int *r1, int *i2)

- if (insn[0] == op1 && (insn[1] & 0xf) == op2)

- {

- *r1 = (insn[1] >> 4) & 0xf;

- /* i2 is a signed quantity. If the host 'int' is 32 bits long,

- no sign extension is necessary, but we don't want to assume

- that. */

- *i2 = (((insn[2] << 24)

- | (insn[3] << 16)

- | (insn[4] << 8)

- | (insn[5])) ^ 0x80000000) - 0x80000000;

- return 1;

- }

- else

- return 0;

-static int

-is_rr (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)

- if (insn[0] == op)

- {

- *r1 = (insn[1] >> 4) & 0xf;

- *r2 = insn[1] & 0xf;

- return 1;

- }

- else

- return 0;

-static int

-is_rre (bfd_byte *insn, int op, unsigned int *r1, unsigned int *r2)

- if (((insn[0] << 8) | insn[1]) == op)

- {

- /* Yes, insn[3]. insn[2] is unused in RRE format. */

- *r1 = (insn[3] >> 4) & 0xf;

- *r2 = insn[3] & 0xf;

- return 1;

- }

- else

- return 0;

-static int

-is_rs (bfd_byte *insn, int op,

- unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)

- if (insn[0] == op)

- {

- *r1 = (insn[1] >> 4) & 0xf;

- *r3 = insn[1] & 0xf;

- *b2 = (insn[2] >> 4) & 0xf;

- *d2 = ((insn[2] & 0xf) << 8) | insn[3];

- return 1;

- }

- else

- return 0;

-static int

-is_rsy (bfd_byte *insn, int op1, int op2,

- unsigned int *r1, unsigned int *r3, unsigned int *d2, unsigned int *b2)

- if (insn[0] == op1

- && insn[5] == op2)

- {

- *r1 = (insn[1] >> 4) & 0xf;

- *r3 = insn[1] & 0xf;

- *b2 = (insn[2] >> 4) & 0xf;

- /* The 'long displacement' is a 20-bit signed integer. */

- *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))

- ^ 0x80000) - 0x80000;

- return 1;

- }

- else

- return 0;

-static int

-is_rsi (bfd_byte *insn, int op,

- unsigned int *r1, unsigned int *r3, int *i2)

- if (insn[0] == op)

- {

- *r1 = (insn[1] >> 4) & 0xf;

- *r3 = insn[1] & 0xf;

- /* i2 is a 16-bit signed quantity. */

- *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;

- return 1;

- }

- else

- return 0;

-static int

-is_rie (bfd_byte *insn, int op1, int op2,

- unsigned int *r1, unsigned int *r3, int *i2)

- if (insn[0] == op1

- && insn[5] == op2)

- {

- *r1 = (insn[1] >> 4) & 0xf;

- *r3 = insn[1] & 0xf;

- /* i2 is a 16-bit signed quantity. */

- *i2 = (((insn[2] << 8) | insn[3]) ^ 0x8000) - 0x8000;

- return 1;

- }

- else

- return 0;

-static int

-is_rx (bfd_byte *insn, int op,

- unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)

- if (insn[0] == op)

- {

- *r1 = (insn[1] >> 4) & 0xf;

- *x2 = insn[1] & 0xf;

- *b2 = (insn[2] >> 4) & 0xf;

- *d2 = ((insn[2] & 0xf) << 8) | insn[3];

- return 1;

- }

- else

- return 0;

-static int

-is_rxy (bfd_byte *insn, int op1, int op2,

- unsigned int *r1, unsigned int *d2, unsigned int *x2, unsigned int *b2)

- if (insn[0] == op1

- && insn[5] == op2)

- {

- *r1 = (insn[1] >> 4) & 0xf;

- *x2 = insn[1] & 0xf;

- *b2 = (insn[2] >> 4) & 0xf;

- /* The 'long displacement' is a 20-bit signed integer. */

- *d2 = ((((insn[2] & 0xf) << 8) | insn[3] | (insn[4] << 12))

- ^ 0x80000) - 0x80000;

- return 1;

- }

- else

- return 0;

-/* Prologue analysis. */

-#define S390_NUM_GPRS 16

-#define S390_NUM_FPRS 16

-struct s390_prologue_data {

- /* The stack. */

- struct pv_area *stack;

- /* The size and byte-order of a GPR or FPR. */

- int gpr_size;

- int fpr_size;

- enum bfd_endian byte_order;

- /* The general-purpose registers. */

- pv_t gpr[S390_NUM_GPRS];

- /* The floating-point registers. */

- pv_t fpr[S390_NUM_FPRS];

- /* The offset relative to the CFA where the incoming GPR N was saved

- by the function prologue. 0 if not saved or unknown. */

- int gpr_slot[S390_NUM_GPRS];

- /* Likewise for FPRs. */

- int fpr_slot[S390_NUM_FPRS];

- /* Nonzero if the backchain was saved. This is assumed to be the

- case when the incoming SP is saved at the current SP location. */

- int back_chain_saved_p;

-};

-/* Return the effective address for an X-style instruction, like:

- L R1, D2(X2, B2)

- Here, X2 and B2 are registers, and D2 is a signed 20-bit

- constant; the effective address is the sum of all three. If either

- X2 or B2 are zero, then it doesn't contribute to the sum --- this

- means that r0 can't be used as either X2 or B2. */

-static pv_t

-s390_addr (struct s390_prologue_data *data,

- int d2, unsigned int x2, unsigned int b2)

- pv_t result;

- result = pv_constant (d2);

- if (x2)

- result = pv_add (result, data->gpr[x2]);

- if (b2)

- result = pv_add (result, data->gpr[b2]);

- return result;

-/* Do a SIZE-byte store of VALUE to D2(X2,B2). */

-static void

-s390_store (struct s390_prologue_data *data,

- int d2, unsigned int x2, unsigned int b2, CORE_ADDR size,

- pv_t value)

- pv_t addr = s390_addr (data, d2, x2, b2);

- pv_t offset;

- /* Check whether we are storing the backchain. */

- offset = pv_subtract (data->gpr[S390_SP_REGNUM - S390_R0_REGNUM], addr);

- if (pv_is_constant (offset) && offset.k == 0)

- if (size == data->gpr_size

- && pv_is_register_k (value, S390_SP_REGNUM, 0))

- {

- data->back_chain_saved_p = 1;

- return;

- }

- /* Check whether we are storing a register into the stack. */

- if (!pv_area_store_would_trash (data->stack, addr))

- pv_area_store (data->stack, addr, size, value);

- /* Note: If this is some store we cannot identify, you might think we

- should forget our cached values, as any of those might have been hit.

- However, we make the assumption that the register save areas are only

- ever stored to once in any given function, and we do recognize these

- stores. Thus every store we cannot recognize does not hit our data. */

-/* Do a SIZE-byte load from D2(X2,B2). */

-static pv_t

-s390_load (struct s390_prologue_data *data,

- int d2, unsigned int x2, unsigned int b2, CORE_ADDR size)

- pv_t addr = s390_addr (data, d2, x2, b2);

- /* If it's a load from an in-line constant pool, then we can

- simulate that, under the assumption that the code isn't

- going to change between the time the processor actually

- executed it creating the current frame, and the time when

- we're analyzing the code to unwind past that frame. */

- if (pv_is_constant (addr))

- {

- struct target_section *secp;

- secp = target_section_by_addr (&current_target, addr.k);

- if (secp != NULL

- && (bfd_get_section_flags (secp->bfd, secp->the_bfd_section)

- & SEC_READONLY))

- return pv_constant (read_memory_integer (addr.k, size,

- data->byte_order));

- }

- /* Check whether we are accessing one of our save slots. */

- return pv_area_fetch (data->stack, addr, size);

-/* Function for finding saved registers in a 'struct pv_area'; we pass

- this to pv_area_scan.

- If VALUE is a saved register, ADDR says it was saved at a constant

- offset from the frame base, and SIZE indicates that the whole

- register was saved, record its offset in the reg_offset table in

- PROLOGUE_UNTYPED. */

-static void

-s390_check_for_saved (void *data_untyped, pv_t addr,

- CORE_ADDR size, pv_t value)

- struct s390_prologue_data *data = data_untyped;

- int i, offset;

- if (!pv_is_register (addr, S390_SP_REGNUM))

- return;

- offset = 16 * data->gpr_size + 32 - addr.k;

- /* If we are storing the original value of a register, we want to

- record the CFA offset. If the same register is stored multiple

- times, the stack slot with the highest address counts. */

- for (i = 0; i < S390_NUM_GPRS; i++)

- if (size == data->gpr_size

- && pv_is_register_k (value, S390_R0_REGNUM + i, 0))

- if (data->gpr_slot[i] == 0

- || data->gpr_slot[i] > offset)

- {

- data->gpr_slot[i] = offset;

- return;

- }

- for (i = 0; i < S390_NUM_FPRS; i++)

- if (size == data->fpr_size

- && pv_is_register_k (value, S390_F0_REGNUM + i, 0))

- if (data->fpr_slot[i] == 0

- || data->fpr_slot[i] > offset)

- {

- data->fpr_slot[i] = offset;

- return;

- }

-/* Analyze the prologue of the function starting at START_PC,

- continuing at most until CURRENT_PC. Initialize DATA to

- hold all information we find out about the state of the registers

- and stack slots. Return the address of the instruction after

- the last one that changed the SP, FP, or back chain; or zero

- on error. */

-static CORE_ADDR

-s390_analyze_prologue (struct gdbarch *gdbarch,

- CORE_ADDR start_pc,

- CORE_ADDR current_pc,

- struct s390_prologue_data *data)

- int word_size = gdbarch_ptr_bit (gdbarch) / 8;

- /* Our return value:

- The address of the instruction after the last one that changed

- the SP, FP, or back chain; zero if we got an error trying to

- read memory. */

- CORE_ADDR result = start_pc;

- /* The current PC for our abstract interpretation. */

- CORE_ADDR pc;

- /* The address of the next instruction after that. */

- CORE_ADDR next_pc;

- /* Set up everything's initial value. */

- {

- int i;

- data->stack = make_pv_area (S390_SP_REGNUM, gdbarch_addr_bit (gdbarch));

- /* For the purpose of prologue tracking, we consider the GPR size to

- be equal to the ABI word size, even if it is actually larger

- (i.e. when running a 32-bit binary under a 64-bit kernel). */

- data->gpr_size = word_size;

- data->fpr_size = 8;

- data->byte_order = gdbarch_byte_order (gdbarch);

- for (i = 0; i < S390_NUM_GPRS; i++)

- data->gpr[i] = pv_register (S390_R0_REGNUM + i, 0);

- for (i = 0; i < S390_NUM_FPRS; i++)

- data->fpr[i] = pv_register (S390_F0_REGNUM + i, 0);

- for (i = 0; i < S390_NUM_GPRS; i++)

- data->gpr_slot[i] = 0;

- for (i = 0; i < S390_NUM_FPRS; i++)

- data->fpr_slot[i] = 0;

- data->back_chain_saved_p = 0;

- }

- /* Start interpreting instructions, until we hit the frame's

- current PC or the first branch instruction. */

- for (pc = start_pc; pc > 0 && pc < current_pc; pc = next_pc)

- {

- bfd_byte insn[S390_MAX_INSTR_SIZE];

- int insn_len = s390_readinstruction (insn, pc);

- bfd_byte dummy[S390_MAX_INSTR_SIZE] = { 0 };

- bfd_byte *insn32 = word_size == 4 ? insn : dummy;

- bfd_byte *insn64 = word_size == 8 ? insn : dummy;

- /* Fields for various kinds of instructions. */

- unsigned int b2, r1, r2, x2, r3;

- int i2, d2;

- /* The values of SP and FP before this instruction,

- for detecting instructions that change them. */

- pv_t pre_insn_sp, pre_insn_fp;

- /* Likewise for the flag whether the back chain was saved. */

- int pre_insn_back_chain_saved_p;

- /* If we got an error trying to read the instruction, report it. */

- if (insn_len < 0)

- {

- result = 0;

- break;

- }

- next_pc = pc + insn_len;

- pre_insn_sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];

- pre_insn_fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];

- pre_insn_back_chain_saved_p = data->back_chain_saved_p;

- /* LHI r1, i2 --- load halfword immediate. */

- /* LGHI r1, i2 --- load halfword immediate (64-bit version). */

- /* LGFI r1, i2 --- load fullword immediate. */

- if (is_ri (insn32, op1_lhi, op2_lhi, &r1, &i2)

- || is_ri (insn64, op1_lghi, op2_lghi, &r1, &i2)

- || is_ril (insn, op1_lgfi, op2_lgfi, &r1, &i2))

- data->gpr[r1] = pv_constant (i2);

- /* LR r1, r2 --- load from register. */

- /* LGR r1, r2 --- load from register (64-bit version). */

- else if (is_rr (insn32, op_lr, &r1, &r2)

- || is_rre (insn64, op_lgr, &r1, &r2))

- data->gpr[r1] = data->gpr[r2];

- /* L r1, d2(x2, b2) --- load. */

- /* LY r1, d2(x2, b2) --- load (long-displacement version). */

- /* LG r1, d2(x2, b2) --- load (64-bit version). */

- else if (is_rx (insn32, op_l, &r1, &d2, &x2, &b2)

- || is_rxy (insn32, op1_ly, op2_ly, &r1, &d2, &x2, &b2)

- || is_rxy (insn64, op1_lg, op2_lg, &r1, &d2, &x2, &b2))

- data->gpr[r1] = s390_load (data, d2, x2, b2, data->gpr_size);

- /* ST r1, d2(x2, b2) --- store. */

- /* STY r1, d2(x2, b2) --- store (long-displacement version). */

- /* STG r1, d2(x2, b2) --- store (64-bit version). */

- else if (is_rx (insn32, op_st, &r1, &d2, &x2, &b2)

- || is_rxy (insn32, op1_sty, op2_sty, &r1, &d2, &x2, &b2)

- || is_rxy (insn64, op1_stg, op2_stg, &r1, &d2, &x2, &b2))

- s390_store (data, d2, x2, b2, data->gpr_size, data->gpr[r1]);

- /* STD r1, d2(x2,b2) --- store floating-point register. */

- else if (is_rx (insn, op_std, &r1, &d2, &x2, &b2))

- s390_store (data, d2, x2, b2, data->fpr_size, data->fpr[r1]);

- /* STM r1, r3, d2(b2) --- store multiple. */

- /* STMY r1, r3, d2(b2) --- store multiple (long-displacement

- version). */

- /* STMG r1, r3, d2(b2) --- store multiple (64-bit version). */

- else if (is_rs (insn32, op_stm, &r1, &r3, &d2, &b2)

- || is_rsy (insn32, op1_stmy, op2_stmy, &r1, &r3, &d2, &b2)

- || is_rsy (insn64, op1_stmg, op2_stmg, &r1, &r3, &d2, &b2))

- {

- for (; r1 <= r3; r1++, d2 += data->gpr_size)

- s390_store (data, d2, 0, b2, data->gpr_size, data->gpr[r1]);

- }

- /* AHI r1, i2 --- add halfword immediate. */

- /* AGHI r1, i2 --- add halfword immediate (64-bit version). */

- /* AFI r1, i2 --- add fullword immediate. */

- /* AGFI r1, i2 --- add fullword immediate (64-bit version). */

- else if (is_ri (insn32, op1_ahi, op2_ahi, &r1, &i2)

- || is_ri (insn64, op1_aghi, op2_aghi, &r1, &i2)

- || is_ril (insn32, op1_afi, op2_afi, &r1, &i2)

- || is_ril (insn64, op1_agfi, op2_agfi, &r1, &i2))

- data->gpr[r1] = pv_add_constant (data->gpr[r1], i2);

- /* ALFI r1, i2 --- add logical immediate. */

- /* ALGFI r1, i2 --- add logical immediate (64-bit version). */

- else if (is_ril (insn32, op1_alfi, op2_alfi, &r1, &i2)

- || is_ril (insn64, op1_algfi, op2_algfi, &r1, &i2))

- data->gpr[r1] = pv_add_constant (data->gpr[r1],

- (CORE_ADDR)i2 & 0xffffffff);

- /* AR r1, r2 -- add register. */

- /* AGR r1, r2 -- add register (64-bit version). */

- else if (is_rr (insn32, op_ar, &r1, &r2)

- || is_rre (insn64, op_agr, &r1, &r2))

- data->gpr[r1] = pv_add (data->gpr[r1], data->gpr[r2]);

- /* A r1, d2(x2, b2) -- add. */

- /* AY r1, d2(x2, b2) -- add (long-displacement version). */

- /* AG r1, d2(x2, b2) -- add (64-bit version). */

- else if (is_rx (insn32, op_a, &r1, &d2, &x2, &b2)

- || is_rxy (insn32, op1_ay, op2_ay, &r1, &d2, &x2, &b2)

- || is_rxy (insn64, op1_ag, op2_ag, &r1, &d2, &x2, &b2))

- data->gpr[r1] = pv_add (data->gpr[r1],

- s390_load (data, d2, x2, b2, data->gpr_size));

- /* SLFI r1, i2 --- subtract logical immediate. */

- /* SLGFI r1, i2 --- subtract logical immediate (64-bit version). */

- else if (is_ril (insn32, op1_slfi, op2_slfi, &r1, &i2)

- || is_ril (insn64, op1_slgfi, op2_slgfi, &r1, &i2))

- data->gpr[r1] = pv_add_constant (data->gpr[r1],

- -((CORE_ADDR)i2 & 0xffffffff));

- /* SR r1, r2 -- subtract register. */

- /* SGR r1, r2 -- subtract register (64-bit version). */

- else if (is_rr (insn32, op_sr, &r1, &r2)

- || is_rre (insn64, op_sgr, &r1, &r2))

- data->gpr[r1] = pv_subtract (data->gpr[r1], data->gpr[r2]);

- /* S r1, d2(x2, b2) -- subtract. */

- /* SY r1, d2(x2, b2) -- subtract (long-displacement version). */

- /* SG r1, d2(x2, b2) -- subtract (64-bit version). */

- else if (is_rx (insn32, op_s, &r1, &d2, &x2, &b2)

- || is_rxy (insn32, op1_sy, op2_sy, &r1, &d2, &x2, &b2)

- || is_rxy (insn64, op1_sg, op2_sg, &r1, &d2, &x2, &b2))

- data->gpr[r1] = pv_subtract (data->gpr[r1],

- s390_load (data, d2, x2, b2, data->gpr_size));

- /* LA r1, d2(x2, b2) --- load address. */

- /* LAY r1, d2(x2, b2) --- load address (long-displacement version). */

- else if (is_rx (insn, op_la, &r1, &d2, &x2, &b2)

- || is_rxy (insn, op1_lay, op2_lay, &r1, &d2, &x2, &b2))

- data->gpr[r1] = s390_addr (data, d2, x2, b2);

- /* LARL r1, i2 --- load address relative long. */

- else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))

- data->gpr[r1] = pv_constant (pc + i2 * 2);

- /* BASR r1, 0 --- branch and save.

- Since r2 is zero, this saves the PC in r1, but doesn't branch. */

- else if (is_rr (insn, op_basr, &r1, &r2)

- && r2 == 0)

- data->gpr[r1] = pv_constant (next_pc);

- /* BRAS r1, i2 --- branch relative and save. */

- else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2))

- {

- data->gpr[r1] = pv_constant (next_pc);

- next_pc = pc + i2 * 2;

- /* We'd better not interpret any backward branches. We'll

- never terminate. */

- if (next_pc <= pc)

- break;

- }

- /* Terminate search when hitting any other branch instruction. */

- else if (is_rr (insn, op_basr, &r1, &r2)

- || is_rx (insn, op_bas, &r1, &d2, &x2, &b2)

- || is_rr (insn, op_bcr, &r1, &r2)

- || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)

- || is_ri (insn, op1_brc, op2_brc, &r1, &i2)

- || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)

- || is_ril (insn, op1_brasl, op2_brasl, &r2, &i2))

- break;

- else

- /* An instruction we don't know how to simulate. The only

- safe thing to do would be to set every value we're tracking

- to 'unknown'. Instead, we'll be optimistic: we assume that

- we *can* interpret every instruction that the compiler uses

- to manipulate any of the data we're interested in here --

- then we can just ignore anything else. */

- ;

- /* Record the address after the last instruction that changed

- the FP, SP, or backlink. Ignore instructions that changed

- them back to their original values --- those are probably

- restore instructions. (The back chain is never restored,

- just popped.) */

- {

- pv_t sp = data->gpr[S390_SP_REGNUM - S390_R0_REGNUM];

- pv_t fp = data->gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];

- if ((! pv_is_identical (pre_insn_sp, sp)

- && ! pv_is_register_k (sp, S390_SP_REGNUM, 0)

- && sp.kind != pvk_unknown)

- || (! pv_is_identical (pre_insn_fp, fp)

- && ! pv_is_register_k (fp, S390_FRAME_REGNUM, 0)

- && fp.kind != pvk_unknown)

- || pre_insn_back_chain_saved_p != data->back_chain_saved_p)

- result = next_pc;

- }

- /* Record where all the registers were saved. */

- pv_area_scan (data->stack, s390_check_for_saved, data);

- free_pv_area (data->stack);

- data->stack = NULL;

- return result;

-/* Advance PC across any function entry prologue instructions to reach

- some "real" code. */

-static CORE_ADDR

-s390_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)

- struct s390_prologue_data data;

- CORE_ADDR skip_pc;

- skip_pc = s390_analyze_prologue (gdbarch, pc, (CORE_ADDR)-1, &data);

- return skip_pc ? skip_pc : pc;

-/* Return true if we are in the functin's epilogue, i.e. after the

- instruction that destroyed the function's stack frame. */

-static int

-s390_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)

- int word_size = gdbarch_ptr_bit (gdbarch) / 8;

- /* In frameless functions, there's not frame to destroy and thus

- we don't care about the epilogue.

- In functions with frame, the epilogue sequence is a pair of

- a LM-type instruction that restores (amongst others) the

- return register %r14 and the stack pointer %r15, followed

- by a branch 'br %r14' --or equivalent-- that effects the

- actual return.

- In that situation, this function needs to return 'true' in

- exactly one case: when pc points to that branch instruction.

- Thus we try to disassemble the one instructions immediately

- preceding pc and check whether it is an LM-type instruction

- modifying the stack pointer.

- Note that disassembling backwards is not reliable, so there

- is a slight chance of false positives here ... */

- bfd_byte insn[6];

- unsigned int r1, r3, b2;

- int d2;

- if (word_size == 4

- && !target_read_memory (pc - 4, insn, 4)

- && is_rs (insn, op_lm, &r1, &r3, &d2, &b2)

- && r3 == S390_SP_REGNUM - S390_R0_REGNUM)

- return 1;

- if (word_size == 4

- && !target_read_memory (pc - 6, insn, 6)

- && is_rsy (insn, op1_lmy, op2_lmy, &r1, &r3, &d2, &b2)

- && r3 == S390_SP_REGNUM - S390_R0_REGNUM)

- return 1;

- if (word_size == 8

- && !target_read_memory (pc - 6, insn, 6)

- && is_rsy (insn, op1_lmg, op2_lmg, &r1, &r3, &d2, &b2)

- && r3 == S390_SP_REGNUM - S390_R0_REGNUM)

- return 1;

- return 0;

-/* Displaced stepping. */

-/* Fix up the state of registers and memory after having single-stepped

- a displaced instruction. */

-static void

-s390_displaced_step_fixup (struct gdbarch *gdbarch,

- struct displaced_step_closure *closure,

- CORE_ADDR from, CORE_ADDR to,

- struct regcache *regs)

- /* Since we use simple_displaced_step_copy_insn, our closure is a

- copy of the instruction. */

- gdb_byte *insn = (gdb_byte *) closure;

- static int s390_instrlen[] = { 2, 4, 4, 6 };

- int insnlen = s390_instrlen[insn[0] >> 6];

- /* Fields for various kinds of instructions. */

- unsigned int b2, r1, r2, x2, r3;

- int i2, d2;

- /* Get current PC and addressing mode bit. */

- CORE_ADDR pc = regcache_read_pc (regs);

- ULONGEST amode = 0;

- if (register_size (gdbarch, S390_PSWA_REGNUM) == 4)

- {

- regcache_cooked_read_unsigned (regs, S390_PSWA_REGNUM, &amode);

- amode &= 0x80000000;

- }

- if (debug_displaced)

- fprintf_unfiltered (gdb_stdlog,

- "displaced: (s390) fixup (%s, %s) pc %s len %d amode 0x%x\n",

- paddress (gdbarch, from), paddress (gdbarch, to),

- paddress (gdbarch, pc), insnlen, (int) amode);

- /* Handle absolute branch and save instructions. */

- if (is_rr (insn, op_basr, &r1, &r2)

- || is_rx (insn, op_bas, &r1, &d2, &x2, &b2))

- {

- /* Recompute saved return address in R1. */

- regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,

- amode | (from + insnlen));

- }

- /* Handle absolute branch instructions. */

- else if (is_rr (insn, op_bcr, &r1, &r2)

- || is_rx (insn, op_bc, &r1, &d2, &x2, &b2)

- || is_rr (insn, op_bctr, &r1, &r2)

- || is_rre (insn, op_bctgr, &r1, &r2)

- || is_rx (insn, op_bct, &r1, &d2, &x2, &b2)

- || is_rxy (insn, op1_bctg, op2_brctg, &r1, &d2, &x2, &b2)

- || is_rs (insn, op_bxh, &r1, &r3, &d2, &b2)

- || is_rsy (insn, op1_bxhg, op2_bxhg, &r1, &r3, &d2, &b2)

- || is_rs (insn, op_bxle, &r1, &r3, &d2, &b2)

- || is_rsy (insn, op1_bxleg, op2_bxleg, &r1, &r3, &d2, &b2))

- {

- /* Update PC iff branch was *not* taken. */

- if (pc == to + insnlen)

- regcache_write_pc (regs, from + insnlen);

- }

- /* Handle PC-relative branch and save instructions. */

- else if (is_ri (insn, op1_bras, op2_bras, &r1, &i2)

- || is_ril (insn, op1_brasl, op2_brasl, &r1, &i2))

- {

- /* Update PC. */

- regcache_write_pc (regs, pc - to + from);

- /* Recompute saved return address in R1. */

- regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,

- amode | (from + insnlen));

- }

- /* Handle PC-relative branch instructions. */

- else if (is_ri (insn, op1_brc, op2_brc, &r1, &i2)

- || is_ril (insn, op1_brcl, op2_brcl, &r1, &i2)

- || is_ri (insn, op1_brct, op2_brct, &r1, &i2)

- || is_ri (insn, op1_brctg, op2_brctg, &r1, &i2)

- || is_rsi (insn, op_brxh, &r1, &r3, &i2)

- || is_rie (insn, op1_brxhg, op2_brxhg, &r1, &r3, &i2)

- || is_rsi (insn, op_brxle, &r1, &r3, &i2)

- || is_rie (insn, op1_brxlg, op2_brxlg, &r1, &r3, &i2))

- {

- /* Update PC. */

- regcache_write_pc (regs, pc - to + from);

- }

- /* Handle LOAD ADDRESS RELATIVE LONG. */

- else if (is_ril (insn, op1_larl, op2_larl, &r1, &i2))

- {

- /* Update PC. */

- regcache_write_pc (regs, from + insnlen);

- /* Recompute output address in R1. */

- regcache_cooked_write_unsigned (regs, S390_R0_REGNUM + r1,

- amode | (from + i2 * 2));

- }

- /* If we executed a breakpoint instruction, point PC right back at it. */

- else if (insn[0] == 0x0 && insn[1] == 0x1)

- regcache_write_pc (regs, from);

- /* For any other insn, PC points right after the original instruction. */

- else

- regcache_write_pc (regs, from + insnlen);

- if (debug_displaced)

- fprintf_unfiltered (gdb_stdlog,

- "displaced: (s390) pc is now %s\n",

- paddress (gdbarch, regcache_read_pc (regs)));

-/* Helper routine to unwind pseudo registers. */

-static struct value *

-s390_unwind_pseudo_register (struct frame_info *this_frame, int regnum)

- struct gdbarch *gdbarch = get_frame_arch (this_frame);

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- struct type *type = register_type (gdbarch, regnum);

- /* Unwind PC via PSW address. */

- if (regnum == tdep->pc_regnum)

- {

- struct value *val;

- val = frame_unwind_register_value (this_frame, S390_PSWA_REGNUM);

- if (!value_optimized_out (val))

- {

- LONGEST pswa = value_as_long (val);

- if (TYPE_LENGTH (type) == 4)

- return value_from_pointer (type, pswa & 0x7fffffff);

- else

- return value_from_pointer (type, pswa);

- }

- /* Unwind CC via PSW mask. */

- if (regnum == tdep->cc_regnum)

- {

- struct value *val;

- val = frame_unwind_register_value (this_frame, S390_PSWM_REGNUM);

- if (!value_optimized_out (val))

- {

- LONGEST pswm = value_as_long (val);

- if (TYPE_LENGTH (type) == 4)

- return value_from_longest (type, (pswm >> 12) & 3);

- else

- return value_from_longest (type, (pswm >> 44) & 3);

- }

- /* Unwind full GPRs to show at least the lower halves (as the

- upper halves are undefined). */

- if (tdep->gpr_full_regnum != -1

- && regnum >= tdep->gpr_full_regnum

- && regnum < tdep->gpr_full_regnum + 16)

- {

- int reg = regnum - tdep->gpr_full_regnum;

- struct value *val;

- val = frame_unwind_register_value (this_frame, S390_R0_REGNUM + reg);

- if (!value_optimized_out (val))

- return value_cast (type, val);

- }

- return allocate_optimized_out_value (type);

-static struct value *

-s390_trad_frame_prev_register (struct frame_info *this_frame,

- struct trad_frame_saved_reg saved_regs[],

- int regnum)

- if (regnum < S390_NUM_REGS)

- return trad_frame_get_prev_register (this_frame, saved_regs, regnum);

- else

- return s390_unwind_pseudo_register (this_frame, regnum);

-/* Normal stack frames. */

-struct s390_unwind_cache {

- CORE_ADDR func;

- CORE_ADDR frame_base;

- CORE_ADDR local_base;

- struct trad_frame_saved_reg *saved_regs;

-};

-static int

-s390_prologue_frame_unwind_cache (struct frame_info *this_frame,

- struct s390_unwind_cache *info)

- struct gdbarch *gdbarch = get_frame_arch (this_frame);

- int word_size = gdbarch_ptr_bit (gdbarch) / 8;

- struct s390_prologue_data data;

- pv_t *fp = &data.gpr[S390_FRAME_REGNUM - S390_R0_REGNUM];

- pv_t *sp = &data.gpr[S390_SP_REGNUM - S390_R0_REGNUM];

- int i;

- CORE_ADDR cfa;

- CORE_ADDR func;

- CORE_ADDR result;

- ULONGEST reg;

- CORE_ADDR prev_sp;

- int frame_pointer;

- int size;

- struct frame_info *next_frame;

- /* Try to find the function start address. If we can't find it, we don't

- bother searching for it -- with modern compilers this would be mostly

- pointless anyway. Trust that we'll either have valid DWARF-2 CFI data

- or else a valid backchain ... */

- func = get_frame_func (this_frame);

- if (!func)

- return 0;

- /* Try to analyze the prologue. */

- result = s390_analyze_prologue (gdbarch, func,

- get_frame_pc (this_frame), &data);

- if (!result)

- return 0;

- /* If this was successful, we should have found the instruction that

- sets the stack pointer register to the previous value of the stack

- pointer minus the frame size. */

- if (!pv_is_register (*sp, S390_SP_REGNUM))

- return 0;

- /* A frame size of zero at this point can mean either a real

- frameless function, or else a failure to find the prologue.

- Perform some sanity checks to verify we really have a

- frameless function. */

- if (sp->k == 0)

- {

- /* If the next frame is a NORMAL_FRAME, this frame *cannot* have frame

- size zero. This is only possible if the next frame is a sentinel

- frame, a dummy frame, or a signal trampoline frame. */

- /* FIXME: cagney/2004-05-01: This sanity check shouldn't be

- needed, instead the code should simpliy rely on its

- analysis. */

- next_frame = get_next_frame (this_frame);

- while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)

- next_frame = get_next_frame (next_frame);

- if (next_frame

- && get_frame_type (get_next_frame (this_frame)) == NORMAL_FRAME)

- return 0;

- /* If we really have a frameless function, %r14 must be valid

- -- in particular, it must point to a different function. */

- reg = get_frame_register_unsigned (this_frame, S390_RETADDR_REGNUM);

- reg = gdbarch_addr_bits_remove (gdbarch, reg) - 1;

- if (get_pc_function_start (reg) == func)

- {

- /* However, there is one case where it *is* valid for %r14

- to point to the same function -- if this is a recursive

- call, and we have stopped in the prologue *before* the

- stack frame was allocated.

- Recognize this case by looking ahead a bit ... */

- struct s390_prologue_data data2;

- pv_t *sp = &data2.gpr[S390_SP_REGNUM - S390_R0_REGNUM];

- if (!(s390_analyze_prologue (gdbarch, func, (CORE_ADDR)-1, &data2)

- && pv_is_register (*sp, S390_SP_REGNUM)

- && sp->k != 0))

- return 0;

- }

- /* OK, we've found valid prologue data. */

- size = -sp->k;

- /* If the frame pointer originally also holds the same value

- as the stack pointer, we're probably using it. If it holds

- some other value -- even a constant offset -- it is most

- likely used as temp register. */

- if (pv_is_identical (*sp, *fp))

- frame_pointer = S390_FRAME_REGNUM;

- else

- frame_pointer = S390_SP_REGNUM;

- /* If we've detected a function with stack frame, we'll still have to

- treat it as frameless if we're currently within the function epilog

- code at a point where the frame pointer has already been restored.

- This can only happen in an innermost frame. */

- /* FIXME: cagney/2004-05-01: This sanity check shouldn't be needed,

- instead the code should simpliy rely on its analysis. */

- next_frame = get_next_frame (this_frame);

- while (next_frame && get_frame_type (next_frame) == INLINE_FRAME)

- next_frame = get_next_frame (next_frame);

- if (size > 0

- && (next_frame == NULL

- || get_frame_type (get_next_frame (this_frame)) != NORMAL_FRAME))

- {

- /* See the comment in s390_in_function_epilogue_p on why this is

- not completely reliable ... */

- if (s390_in_function_epilogue_p (gdbarch, get_frame_pc (this_frame)))

- {

- memset (&data, 0, sizeof (data));

- size = 0;

- frame_pointer = S390_SP_REGNUM;

- }

- /* Once we know the frame register and the frame size, we can unwind

- the current value of the frame register from the next frame, and

- add back the frame size to arrive that the previous frame's

- stack pointer value. */

- prev_sp = get_frame_register_unsigned (this_frame, frame_pointer) + size;

- cfa = prev_sp + 16*word_size + 32;

- /* Set up ABI call-saved/call-clobbered registers. */

- for (i = 0; i < S390_NUM_REGS; i++)

- if (!s390_register_call_saved (gdbarch, i))

- trad_frame_set_unknown (info->saved_regs, i);

- /* CC is always call-clobbered. */

- trad_frame_set_unknown (info->saved_regs, S390_PSWM_REGNUM);

- /* Record the addresses of all register spill slots the prologue parser

- has recognized. Consider only registers defined as call-saved by the

- ABI; for call-clobbered registers the parser may have recognized

- spurious stores. */

- for (i = 0; i < 16; i++)

- if (s390_register_call_saved (gdbarch, S390_R0_REGNUM + i)

- && data.gpr_slot[i] != 0)

- info->saved_regs[S390_R0_REGNUM + i].addr = cfa - data.gpr_slot[i];

- for (i = 0; i < 16; i++)

- if (s390_register_call_saved (gdbarch, S390_F0_REGNUM + i)

- && data.fpr_slot[i] != 0)

- info->saved_regs[S390_F0_REGNUM + i].addr = cfa - data.fpr_slot[i];

- /* Function return will set PC to %r14. */

- info->saved_regs[S390_PSWA_REGNUM] = info->saved_regs[S390_RETADDR_REGNUM];

- /* In frameless functions, we unwind simply by moving the return

- address to the PC. However, if we actually stored to the

- save area, use that -- we might only think the function frameless

- because we're in the middle of the prologue ... */

- if (size == 0

- && !trad_frame_addr_p (info->saved_regs, S390_PSWA_REGNUM))

- {

- info->saved_regs[S390_PSWA_REGNUM].realreg = S390_RETADDR_REGNUM;

- }

- /* Another sanity check: unless this is a frameless function,

- we should have found spill slots for SP and PC.

- If not, we cannot unwind further -- this happens e.g. in

- libc's thread_start routine. */

- if (size > 0)

- {

- if (!trad_frame_addr_p (info->saved_regs, S390_SP_REGNUM)

- || !trad_frame_addr_p (info->saved_regs, S390_PSWA_REGNUM))

- prev_sp = -1;

- }

- /* We use the current value of the frame register as local_base,

- and the top of the register save area as frame_base. */

- if (prev_sp != -1)

- {

- info->frame_base = prev_sp + 16*word_size + 32;

- info->local_base = prev_sp - size;

- }

- info->func = func;

- return 1;

-static void

-s390_backchain_frame_unwind_cache (struct frame_info *this_frame,

- struct s390_unwind_cache *info)

- struct gdbarch *gdbarch = get_frame_arch (this_frame);

- int word_size = gdbarch_ptr_bit (gdbarch) / 8;

- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

- CORE_ADDR backchain;

- ULONGEST reg;

- LONGEST sp;

- int i;

- /* Set up ABI call-saved/call-clobbered registers. */

- for (i = 0; i < S390_NUM_REGS; i++)

- if (!s390_register_call_saved (gdbarch, i))

- trad_frame_set_unknown (info->saved_regs, i);

- /* CC is always call-clobbered. */

- trad_frame_set_unknown (info->saved_regs, S390_PSWM_REGNUM);

- /* Get the backchain. */

- reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);

- backchain = read_memory_unsigned_integer (reg, word_size, byte_order);

- /* A zero backchain terminates the frame chain. As additional

- sanity check, let's verify that the spill slot for SP in the

- save area pointed to by the backchain in fact links back to

- the save area. */

- if (backchain != 0

- && safe_read_memory_integer (backchain + 15*word_size,

- word_size, byte_order, &sp)

- && (CORE_ADDR)sp == backchain)

- {

- /* We don't know which registers were saved, but it will have

- to be at least %r14 and %r15. This will allow us to continue

- unwinding, but other prev-frame registers may be incorrect ... */

- info->saved_regs[S390_SP_REGNUM].addr = backchain + 15*word_size;

- info->saved_regs[S390_RETADDR_REGNUM].addr = backchain + 14*word_size;

- /* Function return will set PC to %r14. */

- info->saved_regs[S390_PSWA_REGNUM]

- = info->saved_regs[S390_RETADDR_REGNUM];

- /* We use the current value of the frame register as local_base,

- and the top of the register save area as frame_base. */

- info->frame_base = backchain + 16*word_size + 32;

- info->local_base = reg;

- }

- info->func = get_frame_pc (this_frame);

-static struct s390_unwind_cache *

-s390_frame_unwind_cache (struct frame_info *this_frame,

- void **this_prologue_cache)

- struct s390_unwind_cache *info;

- if (*this_prologue_cache)

- return *this_prologue_cache;

- info = FRAME_OBSTACK_ZALLOC (struct s390_unwind_cache);

- *this_prologue_cache = info;

- info->saved_regs = trad_frame_alloc_saved_regs (this_frame);

- info->func = -1;

- info->frame_base = -1;

- info->local_base = -1;

- /* Try to use prologue analysis to fill the unwind cache.

- If this fails, fall back to reading the stack backchain. */

- if (!s390_prologue_frame_unwind_cache (this_frame, info))

- s390_backchain_frame_unwind_cache (this_frame, info);

- return info;

-static void

-s390_frame_this_id (struct frame_info *this_frame,

- void **this_prologue_cache,

- struct frame_id *this_id)

- struct s390_unwind_cache *info

- = s390_frame_unwind_cache (this_frame, this_prologue_cache);

- if (info->frame_base == -1)

- return;

- *this_id = frame_id_build (info->frame_base, info->func);

-static struct value *

-s390_frame_prev_register (struct frame_info *this_frame,

- void **this_prologue_cache, int regnum)

- struct gdbarch *gdbarch = get_frame_arch (this_frame);

- struct s390_unwind_cache *info

- = s390_frame_unwind_cache (this_frame, this_prologue_cache);

- return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);

-static const struct frame_unwind s390_frame_unwind = {

- NORMAL_FRAME,

- default_frame_unwind_stop_reason,

- s390_frame_this_id,

- s390_frame_prev_register,

- NULL,

- default_frame_sniffer

-};

-/* Code stubs and their stack frames. For things like PLTs and NULL

- function calls (where there is no true frame and the return address

- is in the RETADDR register). */

-struct s390_stub_unwind_cache

- CORE_ADDR frame_base;

- struct trad_frame_saved_reg *saved_regs;

-};

-static struct s390_stub_unwind_cache *

-s390_stub_frame_unwind_cache (struct frame_info *this_frame,

- void **this_prologue_cache)

- struct gdbarch *gdbarch = get_frame_arch (this_frame);

- int word_size = gdbarch_ptr_bit (gdbarch) / 8;

- struct s390_stub_unwind_cache *info;

- ULONGEST reg;

- if (*this_prologue_cache)

- return *this_prologue_cache;

- info = FRAME_OBSTACK_ZALLOC (struct s390_stub_unwind_cache);

- *this_prologue_cache = info;

- info->saved_regs = trad_frame_alloc_saved_regs (this_frame);

- /* The return address is in register %r14. */

- info->saved_regs[S390_PSWA_REGNUM].realreg = S390_RETADDR_REGNUM;

- /* Retrieve stack pointer and determine our frame base. */

- reg = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);

- info->frame_base = reg + 16*word_size + 32;

- return info;

-static void

-s390_stub_frame_this_id (struct frame_info *this_frame,

- void **this_prologue_cache,

- struct frame_id *this_id)

- struct s390_stub_unwind_cache *info

- = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);

- *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));

-static struct value *

-s390_stub_frame_prev_register (struct frame_info *this_frame,

- void **this_prologue_cache, int regnum)

- struct s390_stub_unwind_cache *info

- = s390_stub_frame_unwind_cache (this_frame, this_prologue_cache);

- return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);

-static int

-s390_stub_frame_sniffer (const struct frame_unwind *self,

- struct frame_info *this_frame,

- void **this_prologue_cache)

- CORE_ADDR addr_in_block;

- bfd_byte insn[S390_MAX_INSTR_SIZE];

- /* If the current PC points to non-readable memory, we assume we

- have trapped due to an invalid function pointer call. We handle

- the non-existing current function like a PLT stub. */

- addr_in_block = get_frame_address_in_block (this_frame);

- if (in_plt_section (addr_in_block, NULL)

- || s390_readinstruction (insn, get_frame_pc (this_frame)) < 0)

- return 1;

- return 0;

-static const struct frame_unwind s390_stub_frame_unwind = {

- NORMAL_FRAME,

- default_frame_unwind_stop_reason,

- s390_stub_frame_this_id,

- s390_stub_frame_prev_register,

- NULL,

- s390_stub_frame_sniffer

-};

-/* Signal trampoline stack frames. */

-struct s390_sigtramp_unwind_cache {

- CORE_ADDR frame_base;

- struct trad_frame_saved_reg *saved_regs;

-};

-static struct s390_sigtramp_unwind_cache *

-s390_sigtramp_frame_unwind_cache (struct frame_info *this_frame,

- void **this_prologue_cache)

- struct gdbarch *gdbarch = get_frame_arch (this_frame);

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- int word_size = gdbarch_ptr_bit (gdbarch) / 8;

- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

- struct s390_sigtramp_unwind_cache *info;

- ULONGEST this_sp, prev_sp;

- CORE_ADDR next_ra, next_cfa, sigreg_ptr, sigreg_high_off;

- int i;

- if (*this_prologue_cache)

- return *this_prologue_cache;

- info = FRAME_OBSTACK_ZALLOC (struct s390_sigtramp_unwind_cache);

- *this_prologue_cache = info;

- info->saved_regs = trad_frame_alloc_saved_regs (this_frame);

- this_sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);

- next_ra = get_frame_pc (this_frame);

- next_cfa = this_sp + 16*word_size + 32;

- /* New-style RT frame:

- retcode + alignment (8 bytes)

- siginfo (128 bytes)

- ucontext (contains sigregs at offset 5 words). */

- if (next_ra == next_cfa)

- {

- sigreg_ptr = next_cfa + 8 + 128 + align_up (5*word_size, 8);

- /* sigregs are followed by uc_sigmask (8 bytes), then by the

- upper GPR halves if present. */

- sigreg_high_off = 8;

- }

- /* Old-style RT frame and all non-RT frames:

- old signal mask (8 bytes)

- pointer to sigregs. */

- else

- {

- sigreg_ptr = read_memory_unsigned_integer (next_cfa + 8,

- word_size, byte_order);

- /* sigregs are followed by signo (4 bytes), then by the

- upper GPR halves if present. */

- sigreg_high_off = 4;

- }

- /* The sigregs structure looks like this:

- long psw_mask;

- long psw_addr;

- long gprs[16];

- int acrs[16];

- int fpc;

- int __pad;

- double fprs[16]; */

- /* PSW mask and address. */

- info->saved_regs[S390_PSWM_REGNUM].addr = sigreg_ptr;

- sigreg_ptr += word_size;

- info->saved_regs[S390_PSWA_REGNUM].addr = sigreg_ptr;

- sigreg_ptr += word_size;

- /* Then the GPRs. */

- for (i = 0; i < 16; i++)

- {

- info->saved_regs[S390_R0_REGNUM + i].addr = sigreg_ptr;

- sigreg_ptr += word_size;

- }

- /* Then the ACRs. */

- for (i = 0; i < 16; i++)

- {

- info->saved_regs[S390_A0_REGNUM + i].addr = sigreg_ptr;

- sigreg_ptr += 4;

- }

- /* The floating-point control word. */

- info->saved_regs[S390_FPC_REGNUM].addr = sigreg_ptr;

- sigreg_ptr += 8;

- /* And finally the FPRs. */

- for (i = 0; i < 16; i++)

- {

- info->saved_regs[S390_F0_REGNUM + i].addr = sigreg_ptr;

- sigreg_ptr += 8;

- }

- /* If we have them, the GPR upper halves are appended at the end. */

- sigreg_ptr += sigreg_high_off;

- if (tdep->gpr_full_regnum != -1)

- for (i = 0; i < 16; i++)

- {

- info->saved_regs[S390_R0_UPPER_REGNUM + i].addr = sigreg_ptr;

- sigreg_ptr += 4;

- }

- /* Restore the previous frame's SP. */

- prev_sp = read_memory_unsigned_integer (

- info->saved_regs[S390_SP_REGNUM].addr,

- word_size, byte_order);

- /* Determine our frame base. */

- info->frame_base = prev_sp + 16*word_size + 32;

- return info;

-static void

-s390_sigtramp_frame_this_id (struct frame_info *this_frame,

- void **this_prologue_cache,

- struct frame_id *this_id)

- struct s390_sigtramp_unwind_cache *info

- = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);

- *this_id = frame_id_build (info->frame_base, get_frame_pc (this_frame));

-static struct value *

-s390_sigtramp_frame_prev_register (struct frame_info *this_frame,

- void **this_prologue_cache, int regnum)

- struct s390_sigtramp_unwind_cache *info

- = s390_sigtramp_frame_unwind_cache (this_frame, this_prologue_cache);

- return s390_trad_frame_prev_register (this_frame, info->saved_regs, regnum);

-static int

-s390_sigtramp_frame_sniffer (const struct frame_unwind *self,

- struct frame_info *this_frame,

- void **this_prologue_cache)

- CORE_ADDR pc = get_frame_pc (this_frame);

- bfd_byte sigreturn[2];

- if (target_read_memory (pc, sigreturn, 2))

- return 0;

- if (sigreturn[0] != 0x0a /* svc */)

- return 0;

- if (sigreturn[1] != 119 /* sigreturn */

- && sigreturn[1] != 173 /* rt_sigreturn */)

- return 0;

- return 1;

-static const struct frame_unwind s390_sigtramp_frame_unwind = {

- SIGTRAMP_FRAME,

- default_frame_unwind_stop_reason,

- s390_sigtramp_frame_this_id,

- s390_sigtramp_frame_prev_register,

- NULL,

- s390_sigtramp_frame_sniffer

-};

-/* Frame base handling. */

-static CORE_ADDR

-s390_frame_base_address (struct frame_info *this_frame, void **this_cache)

- struct s390_unwind_cache *info

- = s390_frame_unwind_cache (this_frame, this_cache);

- return info->frame_base;

-static CORE_ADDR

-s390_local_base_address (struct frame_info *this_frame, void **this_cache)

- struct s390_unwind_cache *info

- = s390_frame_unwind_cache (this_frame, this_cache);

- return info->local_base;

-static const struct frame_base s390_frame_base = {

- &s390_frame_unwind,

- s390_frame_base_address,

- s390_local_base_address,

- s390_local_base_address

-};

-static CORE_ADDR

-s390_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- ULONGEST pc;

- pc = frame_unwind_register_unsigned (next_frame, tdep->pc_regnum);

- return gdbarch_addr_bits_remove (gdbarch, pc);

-static CORE_ADDR

-s390_unwind_sp (struct gdbarch *gdbarch, struct frame_info *next_frame)

- ULONGEST sp;

- sp = frame_unwind_register_unsigned (next_frame, S390_SP_REGNUM);

- return gdbarch_addr_bits_remove (gdbarch, sp);

-/* DWARF-2 frame support. */

-static struct value *

-s390_dwarf2_prev_register (struct frame_info *this_frame, void **this_cache,

- int regnum)

- return s390_unwind_pseudo_register (this_frame, regnum);

-static void

-s390_dwarf2_frame_init_reg (struct gdbarch *gdbarch, int regnum,

- struct dwarf2_frame_state_reg *reg,

- struct frame_info *this_frame)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- /* The condition code (and thus PSW mask) is call-clobbered. */

- if (regnum == S390_PSWM_REGNUM)

- reg->how = DWARF2_FRAME_REG_UNDEFINED;

- /* The PSW address unwinds to the return address. */

- else if (regnum == S390_PSWA_REGNUM)

- reg->how = DWARF2_FRAME_REG_RA;

- /* Fixed registers are call-saved or call-clobbered

- depending on the ABI in use. */

- else if (regnum < S390_NUM_REGS)

- {

- if (s390_register_call_saved (gdbarch, regnum))

- reg->how = DWARF2_FRAME_REG_SAME_VALUE;

- else

- reg->how = DWARF2_FRAME_REG_UNDEFINED;

- }

- /* We install a special function to unwind pseudos. */

- else

- {

- reg->how = DWARF2_FRAME_REG_FN;

- reg->loc.fn = s390_dwarf2_prev_register;

- }

-/* Dummy function calls. */

-/* Return non-zero if TYPE is an integer-like type, zero otherwise.

- "Integer-like" types are those that should be passed the way

- integers are: integers, enums, ranges, characters, and booleans. */

-static int

-is_integer_like (struct type *type)

- enum type_code code = TYPE_CODE (type);

- return (code == TYPE_CODE_INT

- || code == TYPE_CODE_ENUM

- || code == TYPE_CODE_RANGE

- || code == TYPE_CODE_CHAR

- || code == TYPE_CODE_BOOL);

-/* Return non-zero if TYPE is a pointer-like type, zero otherwise.

- "Pointer-like" types are those that should be passed the way

- pointers are: pointers and references. */

-static int

-is_pointer_like (struct type *type)

- enum type_code code = TYPE_CODE (type);

- return (code == TYPE_CODE_PTR

- || code == TYPE_CODE_REF);

-/* Return non-zero if TYPE is a `float singleton' or `double

- singleton', zero otherwise.

- A `T singleton' is a struct type with one member, whose type is

- either T or a `T singleton'. So, the following are all float

- singletons:

- struct { float x };

- struct { struct { float x; } x; };

- struct { struct { struct { float x; } x; } x; };

- ... and so on.

- All such structures are passed as if they were floats or doubles,

- as the (revised) ABI says. */

-static int

-is_float_singleton (struct type *type)

- if (TYPE_CODE (type) == TYPE_CODE_STRUCT && TYPE_NFIELDS (type) == 1)

- {

- struct type *singleton_type = TYPE_FIELD_TYPE (type, 0);

- CHECK_TYPEDEF (singleton_type);

- return (TYPE_CODE (singleton_type) == TYPE_CODE_FLT

- || TYPE_CODE (singleton_type) == TYPE_CODE_DECFLOAT

- || is_float_singleton (singleton_type));

- }

- return 0;

-/* Return non-zero if TYPE is a struct-like type, zero otherwise.

- "Struct-like" types are those that should be passed as structs are:

- structs and unions.

- As an odd quirk, not mentioned in the ABI, GCC passes float and

- double singletons as if they were a plain float, double, etc. (The

- corresponding union types are handled normally.) So we exclude

- those types here. *shrug* */

-static int

-is_struct_like (struct type *type)

- enum type_code code = TYPE_CODE (type);

- return (code == TYPE_CODE_UNION

- || (code == TYPE_CODE_STRUCT && ! is_float_singleton (type)));

-/* Return non-zero if TYPE is a float-like type, zero otherwise.

- "Float-like" types are those that should be passed as

- floating-point values are.

- You'd think this would just be floats, doubles, long doubles, etc.

- But as an odd quirk, not mentioned in the ABI, GCC passes float and

- double singletons as if they were a plain float, double, etc. (The

- corresponding union types are handled normally.) So we include

- those types here. *shrug* */

-static int

-is_float_like (struct type *type)

- return (TYPE_CODE (type) == TYPE_CODE_FLT

- || TYPE_CODE (type) == TYPE_CODE_DECFLOAT

- || is_float_singleton (type));

-static int

-is_power_of_two (unsigned int n)

- return ((n & (n - 1)) == 0);

-/* Return non-zero if TYPE should be passed as a pointer to a copy,

- zero otherwise. */

-static int

-s390_function_arg_pass_by_reference (struct type *type)

- unsigned length = TYPE_LENGTH (type);

- if (length > 8)

- return 1;

- return (is_struct_like (type) && !is_power_of_two (TYPE_LENGTH (type)))

- || TYPE_CODE (type) == TYPE_CODE_COMPLEX

- || (TYPE_CODE (type) == TYPE_CODE_ARRAY && TYPE_VECTOR (type));

-/* Return non-zero if TYPE should be passed in a float register

- if possible. */

-static int

-s390_function_arg_float (struct type *type)

- unsigned length = TYPE_LENGTH (type);

- if (length > 8)

- return 0;

- return is_float_like (type);

-/* Return non-zero if TYPE should be passed in an integer register

- (or a pair of integer registers) if possible. */

-static int

-s390_function_arg_integer (struct type *type)

- unsigned length = TYPE_LENGTH (type);

- if (length > 8)

- return 0;

- return is_integer_like (type)

- || is_pointer_like (type)

- || (is_struct_like (type) && is_power_of_two (length));

-/* Return ARG, a `SIMPLE_ARG', sign-extended or zero-extended to a full

- word as required for the ABI. */

-static LONGEST

-extend_simple_arg (struct gdbarch *gdbarch, struct value *arg)

- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

- struct type *type = check_typedef (value_type (arg));

- /* Even structs get passed in the least significant bits of the

- register / memory word. It's not really right to extract them as

- an integer, but it does take care of the extension. */

- if (TYPE_UNSIGNED (type))

- return extract_unsigned_integer (value_contents (arg),

- TYPE_LENGTH (type), byte_order);

- else

- return extract_signed_integer (value_contents (arg),

- TYPE_LENGTH (type), byte_order);

-/* Return the alignment required by TYPE. */

-static int

-alignment_of (struct type *type)

- int alignment;

- if (is_integer_like (type)

- || is_pointer_like (type)

- || TYPE_CODE (type) == TYPE_CODE_FLT

- || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)

- alignment = TYPE_LENGTH (type);

- else if (TYPE_CODE (type) == TYPE_CODE_STRUCT

- || TYPE_CODE (type) == TYPE_CODE_UNION)

- {

- int i;

- alignment = 1;

- for (i = 0; i < TYPE_NFIELDS (type); i++)

- {

- int field_alignment

- = alignment_of (check_typedef (TYPE_FIELD_TYPE (type, i)));

- if (field_alignment > alignment)

- alignment = field_alignment;

- }

- else

- alignment = 1;

- /* Check that everything we ever return is a power of two. Lots of

- code doesn't want to deal with aligning things to arbitrary

- boundaries. */

- gdb_assert ((alignment & (alignment - 1)) == 0);

- return alignment;

-/* Put the actual parameter values pointed to by ARGS[0..NARGS-1] in

- place to be passed to a function, as specified by the "GNU/Linux

- for S/390 ELF Application Binary Interface Supplement".

- SP is the current stack pointer. We must put arguments, links,

- padding, etc. whereever they belong, and return the new stack

- pointer value.

- If STRUCT_RETURN is non-zero, then the function we're calling is

- going to return a structure by value; STRUCT_ADDR is the address of

- a block we've allocated for it on the stack.

- Our caller has taken care of any type promotions needed to satisfy

- prototypes or the old K&R argument-passing rules. */

-static CORE_ADDR

-s390_push_dummy_call (struct gdbarch *gdbarch, struct value *function,

- struct regcache *regcache, CORE_ADDR bp_addr,

- int nargs, struct value **args, CORE_ADDR sp,

- int struct_return, CORE_ADDR struct_addr)

- struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

- int word_size = gdbarch_ptr_bit (gdbarch) / 8;

- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

- int i;

- /* If the i'th argument is passed as a reference to a copy, then

- copy_addr[i] is the address of the copy we made. */

- CORE_ADDR *copy_addr = alloca (nargs * sizeof (CORE_ADDR));

- /* Reserve space for the reference-to-copy area. */

- for (i = 0; i < nargs; i++)

- {

- struct value *arg = args[i];

- struct type *type = check_typedef (value_type (arg));

- unsigned length = TYPE_LENGTH (type);

- if (s390_function_arg_pass_by_reference (type))

- {

- sp -= length;

- sp = align_down (sp, alignment_of (type));

- copy_addr[i] = sp;

- }

- /* Reserve space for the parameter area. As a conservative

- simplification, we assume that everything will be passed on the

- stack. Since every argument larger than 8 bytes will be

- passed by reference, we use this simple upper bound. */

- sp -= nargs * 8;

- /* After all that, make sure it's still aligned on an eight-byte

- boundary. */

- sp = align_down (sp, 8);

- /* Allocate the standard frame areas: the register save area, the

- word reserved for the compiler (which seems kind of meaningless),

- and the back chain pointer. */

- sp -= 16*word_size + 32;

- /* Now we have the final SP value. Make sure we didn't underflow;

- on 31-bit, this would result in addresses with the high bit set,

- which causes confusion elsewhere. Note that if we error out

- here, stack and registers remain untouched. */

- if (gdbarch_addr_bits_remove (gdbarch, sp) != sp)

- error (_("Stack overflow"));

- /* Finally, place the actual parameters, working from SP towards

- higher addresses. The code above is supposed to reserve enough

- space for this. */

- {

- int fr = 0;

- int gr = 2;

- CORE_ADDR starg = sp + 16*word_size + 32;

- /* A struct is returned using general register 2. */

- if (struct_return)

- {

- regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,

- struct_addr);

- gr++;

- }

- for (i = 0; i < nargs; i++)

- {

- struct value *arg = args[i];

- struct type *type = check_typedef (value_type (arg));

- unsigned length = TYPE_LENGTH (type);

- if (s390_function_arg_pass_by_reference (type))

- {

- /* Actually copy the argument contents to the stack slot

- that was reserved above. */

- write_memory (copy_addr[i], value_contents (arg), length);

- if (gr <= 6)

- {

- regcache_cooked_write_unsigned (regcache, S390_R0_REGNUM + gr,

- copy_addr[i]);

- gr++;

- }

- else

- {

- write_memory_unsigned_integer (starg, word_size, byte_order,

- copy_addr[i]);

- starg += word_size;

- }

- else if (s390_function_arg_float (type))

- {

- /* The GNU/Linux for S/390 ABI uses FPRs 0 and 2 to pass arguments,

- the GNU/Linux for zSeries ABI uses 0, 2, 4, and 6. */

- if (fr <= (tdep->abi == ABI_LINUX_S390 ? 2 : 6))

- {

- /* When we store a single-precision value in an FP register,

- it occupies the leftmost bits. */

- regcache_cooked_write_part (regcache, S390_F0_REGNUM + fr,

- 0, length, value_contents (arg));

- fr += 2;

- }

- else

- {

- /* When we store a single-precision value in a stack slot,

- it occupies the rightmost bits. */

- starg = align_up (starg + length, word_size);

- write_memory (starg - length, value_contents (arg), length);

- }

- else if (s390_function_arg_integer (type) && length <= word_size)

- {

- if (gr <= 6)

- {

- /* Integer arguments are always extended to word size. */

- regcache_cooked_write_signed (regcache, S390_R0_REGNUM + gr,

- extend_simple_arg (gdbarch,

- arg));

- gr++;

- }

- else

- {

- /* Integer arguments are always extended to word size. */

- write_memory_signed_integer (starg, word_size, byte_order,

- extend_simple_arg (gdbarch, arg));

- starg += word_size;

- }

- else if (s390_function_arg_integer (type) && length == 2*word_size)

- {

- if (gr <= 5)

- {

- regcache_cooked_write (regcache, S390_R0_REGNUM + gr,

- value_contents (arg));

- regcache_cooked_write (regcache, S390_R0_REGNUM + gr + 1,

- value_contents (arg) + word_size);

- gr += 2;

- }

- else

- {

- /* If we skipped r6 because we couldn't fit a DOUBLE_ARG

- in it, then don't go back and use it again later. */

- gr = 7;

- write_memory (starg, value_contents (arg), length);

- starg += length;

- }

- else

- internal_error (__FILE__, __LINE__, _("unknown argument type"));

- }

- /* Store return PSWA. In 31-bit mode, keep addressing mode bit. */

- if (word_size == 4)

- {

- ULONGEST pswa;

- regcache_cooked_read_unsigned (regcache, S390_PSWA_REGNUM, &pswa);

- bp_addr = (bp_addr & 0x7fffffff) | (pswa & 0x80000000);

- }

- regcache_cooked_write_unsigned (regcache, S390_RETADDR_REGNUM, bp_addr);

- /* Store updated stack pointer. */

- regcache_cooked_write_unsigned (regcache, S390_SP_REGNUM, sp);

- /* We need to return the 'stack part' of the frame ID,

- which is actually the top of the register save area. */

- return sp + 16*word_size + 32;

-/* Assuming THIS_FRAME is a dummy, return the frame ID of that

- dummy frame. The frame ID's base needs to match the TOS value

- returned by push_dummy_call, and the PC match the dummy frame's

- breakpoint. */

-static struct frame_id

-s390_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)

- int word_size = gdbarch_ptr_bit (gdbarch) / 8;

- CORE_ADDR sp = get_frame_register_unsigned (this_frame, S390_SP_REGNUM);

- sp = gdbarch_addr_bits_remove (gdbarch, sp);

- return frame_id_build (sp + 16*word_size + 32,

- get_frame_pc (this_frame));

-static CORE_ADDR

-s390_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)

- /* Both the 32- and 64-bit ABI's say that the stack pointer should

- always be aligned on an eight-byte boundary. */

- return (addr & -8);

-/* Function return value access. */

-static enum return_value_convention

-s390_return_value_convention (struct gdbarch *gdbarch, struct type *type)

- int length = TYPE_LENGTH (type);

- if (length > 8)

- return RETURN_VALUE_STRUCT_CONVENTION;

- switch (TYPE_CODE (type))

- {

- case TYPE_CODE_STRUCT:

- case TYPE_CODE_UNION:

- case TYPE_CODE_ARRAY:

- case TYPE_CODE_COMPLEX:

- return RETURN_VALUE_STRUCT_CONVENTION;

- default:

- return RETURN_VALUE_REGISTER_CONVENTION;

- }

-static enum return_value_convention

-s390_return_value (struct gdbarch *gdbarch, struct value *function,

- struct type *type, struct regcache *regcache,

- gdb_byte *out, const gdb_byte *in)

- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

- int word_size = gdbarch_ptr_bit (gdbarch) / 8;

- enum return_value_convention rvc;

- int length;

- type = check_typedef (type);

- rvc = s390_return_value_convention (gdbarch, type);

- length = TYPE_LENGTH (type);

- if (in)

- {

- switch (rvc)

- {

- case RETURN_VALUE_REGISTER_CONVENTION:

- if (TYPE_CODE (type) == TYPE_CODE_FLT

- || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)

- {

- /* When we store a single-precision value in an FP register,

- it occupies the leftmost bits. */

- regcache_cooked_write_part (regcache, S390_F0_REGNUM,

- 0, length, in);

- }

- else if (length <= word_size)

- {

- /* Integer arguments are always extended to word size. */

- if (TYPE_UNSIGNED (type))

- regcache_cooked_write_unsigned (regcache, S390_R2_REGNUM,

- extract_unsigned_integer (in, length, byte_order));

- else

- regcache_cooked_write_signed (regcache, S390_R2_REGNUM,

- extract_signed_integer (in, length, byte_order));

- }

- else if (length == 2*word_size)

- {

- regcache_cooked_write (regcache, S390_R2_REGNUM, in);

- regcache_cooked_write (regcache, S390_R3_REGNUM, in + word_size);

- }

- else

- internal_error (__FILE__, __LINE__, _("invalid return type"));

- break;

- case RETURN_VALUE_STRUCT_CONVENTION:

- error (_("Cannot set function return value."));

- break;

- }

- else if (out)

- {

- switch (rvc)

- {

- case RETURN_VALUE_REGISTER_CONVENTION:

- if (TYPE_CODE (type) == TYPE_CODE_FLT

- || TYPE_CODE (type) == TYPE_CODE_DECFLOAT)

- {

- /* When we store a single-precision value in an FP register,

- it occupies the leftmost bits. */

- regcache_cooked_read_part (regcache, S390_F0_REGNUM,

- 0, length, out);

- }

- else if (length <= word_size)

- {

- /* Integer arguments occupy the rightmost bits. */

- regcache_cooked_read_part (regcache, S390_R2_REGNUM,

- word_size - length, length, out);

- }

- else if (length == 2*word_size)

- {

- regcache_cooked_read (regcache, S390_R2_REGNUM, out);

- regcache_cooked_read (regcache, S390_R3_REGNUM, out + word_size);

- }

- else

- internal_error (__FILE__, __LINE__, _("invalid return type"));

- break;

- case RETURN_VALUE_STRUCT_CONVENTION:

- error (_("Function return value unknown."));

- break;

- }

- return rvc;

-/* Breakpoints. */

-static const gdb_byte *

-s390_breakpoint_from_pc (struct gdbarch *gdbarch,

- CORE_ADDR *pcptr, int *lenptr)

- static const gdb_byte breakpoint[] = { 0x0, 0x1 };

- *lenptr = sizeof (breakpoint);

- return breakpoint;

-/* Address handling. */

-static CORE_ADDR

-s390_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR addr)

- return addr & 0x7fffffff;

-static int

-s390_address_class_type_flags (int byte_size, int dwarf2_addr_class)

- if (byte_size == 4)

- return TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;

- else

- return 0;

-static const char *

-s390_address_class_type_flags_to_name (struct gdbarch *gdbarch, int type_flags)

- if (type_flags & TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1)

- return "mode32";

- else

- return NULL;

-static int

-s390_address_class_name_to_type_flags (struct gdbarch *gdbarch,

- const char *name,

- int *type_flags_ptr)

- if (strcmp (name, "mode32") == 0)

- {

- *type_flags_ptr = TYPE_INSTANCE_FLAG_ADDRESS_CLASS_1;

- return 1;

- }

- else

- return 0;

-/* Implementation of `gdbarch_stap_is_single_operand', as defined in

- gdbarch.h. */

-static int

-s390_stap_is_single_operand (struct gdbarch *gdbarch, const char *s)

- return ((isdigit (*s) && s[1] == '(' && s[2] == '%') /* Displacement

- or indirection. */

- || *s == '%' /* Register access. */

- || isdigit (*s)); /* Literal number. */

-/* Set up gdbarch struct. */

-static struct gdbarch *

-s390_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)

- const struct target_desc *tdesc = info.target_desc;

- struct tdesc_arch_data *tdesc_data = NULL;

- struct gdbarch *gdbarch;

- struct gdbarch_tdep *tdep;

- int tdep_abi;

- int have_upper = 0;

- int have_linux_v1 = 0;

- int have_linux_v2 = 0;

- int first_pseudo_reg, last_pseudo_reg;

- /* Default ABI and register size. */

- switch (info.bfd_arch_info->mach)

- {

- case bfd_mach_s390_31:

- tdep_abi = ABI_LINUX_S390;

- break;

- case bfd_mach_s390_64:

- tdep_abi = ABI_LINUX_ZSERIES;

- break;

- default:

- return NULL;

- }

- /* Use default target description if none provided by the target. */

- if (!tdesc_has_registers (tdesc))

- {

- if (tdep_abi == ABI_LINUX_S390)

- tdesc = tdesc_s390_linux32;

- else

- tdesc = tdesc_s390x_linux64;

- }

- /* Check any target description for validity. */

- if (tdesc_has_registers (tdesc))

- {

- static const char *const gprs[] = {

- "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",

- "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"

- };

- static const char *const fprs[] = {

- "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",

- "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15"

- };

- static const char *const acrs[] = {

- "acr0", "acr1", "acr2", "acr3", "acr4", "acr5", "acr6", "acr7",

- "acr8", "acr9", "acr10", "acr11", "acr12", "acr13", "acr14", "acr15"

- };

- static const char *const gprs_lower[] = {

- "r0l", "r1l", "r2l", "r3l", "r4l", "r5l", "r6l", "r7l",

- "r8l", "r9l", "r10l", "r11l", "r12l", "r13l", "r14l", "r15l"

- };

- static const char *const gprs_upper[] = {

- "r0h", "r1h", "r2h", "r3h", "r4h", "r5h", "r6h", "r7h",

- "r8h", "r9h", "r10h", "r11h", "r12h", "r13h", "r14h", "r15h"

- };

- const struct tdesc_feature *feature;

- int i, valid_p = 1;

- feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.core");

- if (feature == NULL)

- return NULL;

- tdesc_data = tdesc_data_alloc ();

- valid_p &= tdesc_numbered_register (feature, tdesc_data,

- S390_PSWM_REGNUM, "pswm");

- valid_p &= tdesc_numbered_register (feature, tdesc_data,

- S390_PSWA_REGNUM, "pswa");

- if (tdesc_unnumbered_register (feature, "r0"))

- {

- for (i = 0; i < 16; i++)

- valid_p &= tdesc_numbered_register (feature, tdesc_data,

- S390_R0_REGNUM + i, gprs[i]);

- }

- else

- {

- have_upper = 1;

- for (i = 0; i < 16; i++)

- valid_p &= tdesc_numbered_register (feature, tdesc_data,

- S390_R0_REGNUM + i,

- gprs_lower[i]);

- for (i = 0; i < 16; i++)

- valid_p &= tdesc_numbered_register (feature, tdesc_data,

- S390_R0_UPPER_REGNUM + i,

- gprs_upper[i]);

- }

- feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.fpr");

- if (feature == NULL)

- {

- tdesc_data_cleanup (tdesc_data);

- return NULL;

- }

- valid_p &= tdesc_numbered_register (feature, tdesc_data,

- S390_FPC_REGNUM, "fpc");

- for (i = 0; i < 16; i++)

- valid_p &= tdesc_numbered_register (feature, tdesc_data,

- S390_F0_REGNUM + i, fprs[i]);

- feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.acr");

- if (feature == NULL)

- {

- tdesc_data_cleanup (tdesc_data);

- return NULL;

- }

- for (i = 0; i < 16; i++)

- valid_p &= tdesc_numbered_register (feature, tdesc_data,

- S390_A0_REGNUM + i, acrs[i]);

- /* Optional GNU/Linux-specific "registers". */

- feature = tdesc_find_feature (tdesc, "org.gnu.gdb.s390.linux");

- if (feature)

- {

- tdesc_numbered_register (feature, tdesc_data,

- S390_ORIG_R2_REGNUM, "orig_r2");

- if (tdesc_numbered_register (feature, tdesc_data,

- S390_LAST_BREAK_REGNUM, "last_break"))

- have_linux_v1 = 1;

- if (tdesc_numbered_register (feature, tdesc_data,

- S390_SYSTEM_CALL_REGNUM, "system_call"))

- have_linux_v2 = 1;

- if (have_linux_v2 > have_linux_v1)

- valid_p = 0;

- }

- if (!valid_p)

- {

- tdesc_data_cleanup (tdesc_data);

- return NULL;

- }

- /* Find a candidate among extant architectures. */

- for (arches = gdbarch_list_lookup_by_info (arches, &info);

- arches != NULL;

- arches = gdbarch_list_lookup_by_info (arches->next, &info))

- {

- tdep = gdbarch_tdep (arches->gdbarch);

- if (!tdep)

- continue;

- if (tdep->abi != tdep_abi)

- continue;

- if ((tdep->gpr_full_regnum != -1) != have_upper)

- continue;

- if (tdesc_data != NULL)

- tdesc_data_cleanup (tdesc_data);

- return arches->gdbarch;

- }

- /* Otherwise create a new gdbarch for the specified machine type. */

- tdep = XCALLOC (1, struct gdbarch_tdep);

- tdep->abi = tdep_abi;

- gdbarch = gdbarch_alloc (&info, tdep);

- set_gdbarch_believe_pcc_promotion (gdbarch, 0);

- set_gdbarch_char_signed (gdbarch, 0);

- /* S/390 GNU/Linux uses either 64-bit or 128-bit long doubles.

- We can safely let them default to 128-bit, since the debug info

- will give the size of type actually used in each case. */

- set_gdbarch_long_double_bit (gdbarch, 128);

- set_gdbarch_long_double_format (gdbarch, floatformats_ia64_quad);

- /* Amount PC must be decremented by after a breakpoint. This is

- often the number of bytes returned by gdbarch_breakpoint_from_pc but not

- always. */

- set_gdbarch_decr_pc_after_break (gdbarch, 2);

- /* Stack grows downward. */

- set_gdbarch_inner_than (gdbarch, core_addr_lessthan);

- set_gdbarch_breakpoint_from_pc (gdbarch, s390_breakpoint_from_pc);

- set_gdbarch_skip_prologue (gdbarch, s390_skip_prologue);

- set_gdbarch_in_function_epilogue_p (gdbarch, s390_in_function_epilogue_p);

- set_gdbarch_num_regs (gdbarch, S390_NUM_REGS);

- set_gdbarch_sp_regnum (gdbarch, S390_SP_REGNUM);

- set_gdbarch_fp0_regnum (gdbarch, S390_F0_REGNUM);

- set_gdbarch_stab_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);

- set_gdbarch_dwarf2_reg_to_regnum (gdbarch, s390_dwarf_reg_to_regnum);

- set_gdbarch_value_from_register (gdbarch, s390_value_from_register);

- set_gdbarch_regset_from_core_section (gdbarch,

- s390_regset_from_core_section);

- set_gdbarch_core_read_description (gdbarch, s390_core_read_description);

- set_gdbarch_cannot_store_register (gdbarch, s390_cannot_store_register);

- set_gdbarch_write_pc (gdbarch, s390_write_pc);

- set_gdbarch_pseudo_register_read (gdbarch, s390_pseudo_register_read);

- set_gdbarch_pseudo_register_write (gdbarch, s390_pseudo_register_write);

- set_tdesc_pseudo_register_name (gdbarch, s390_pseudo_register_name);

- set_tdesc_pseudo_register_type (gdbarch, s390_pseudo_register_type);

- set_tdesc_pseudo_register_reggroup_p (gdbarch,

- s390_pseudo_register_reggroup_p);

- tdesc_use_registers (gdbarch, tdesc, tdesc_data);

- /* Assign pseudo register numbers. */

- first_pseudo_reg = gdbarch_num_regs (gdbarch);

- last_pseudo_reg = first_pseudo_reg;

- tdep->gpr_full_regnum = -1;

- if (have_upper)

- {

- tdep->gpr_full_regnum = last_pseudo_reg;

- last_pseudo_reg += 16;

- }

- tdep->pc_regnum = last_pseudo_reg++;

- tdep->cc_regnum = last_pseudo_reg++;

- set_gdbarch_pc_regnum (gdbarch, tdep->pc_regnum);

- set_gdbarch_num_pseudo_regs (gdbarch, last_pseudo_reg - first_pseudo_reg);

- /* Inferior function calls. */

- set_gdbarch_push_dummy_call (gdbarch, s390_push_dummy_call);

- set_gdbarch_dummy_id (gdbarch, s390_dummy_id);

- set_gdbarch_frame_align (gdbarch, s390_frame_align);

- set_gdbarch_return_value (gdbarch, s390_return_value);

- /* Frame handling. */

- dwarf2_frame_set_init_reg (gdbarch, s390_dwarf2_frame_init_reg);

- dwarf2_frame_set_adjust_regnum (gdbarch, s390_adjust_frame_regnum);

- dwarf2_append_unwinders (gdbarch);

- frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);

- frame_unwind_append_unwinder (gdbarch, &s390_stub_frame_unwind);

- frame_unwind_append_unwinder (gdbarch, &s390_sigtramp_frame_unwind);

- frame_unwind_append_unwinder (gdbarch, &s390_frame_unwind);

- frame_base_set_default (gdbarch, &s390_frame_base);

- set_gdbarch_unwind_pc (gdbarch, s390_unwind_pc);

- set_gdbarch_unwind_sp (gdbarch, s390_unwind_sp);

- /* Displaced stepping. */

- set_gdbarch_displaced_step_copy_insn (gdbarch,

- simple_displaced_step_copy_insn);

- set_gdbarch_displaced_step_fixup (gdbarch, s390_displaced_step_fixup);

- set_gdbarch_displaced_step_free_closure (gdbarch,

- simple_displaced_step_free_closure);

- set_gdbarch_displaced_step_location (gdbarch,

- displaced_step_at_entry_point);

- set_gdbarch_max_insn_length (gdbarch, S390_MAX_INSTR_SIZE);

- /* Note that GNU/Linux is the only OS supported on this

- platform. */

- linux_init_abi (info, gdbarch);

- switch (tdep->abi)

- {

- case ABI_LINUX_S390:

- tdep->gregset = &s390_gregset;

- tdep->sizeof_gregset = s390_sizeof_gregset;

- tdep->fpregset = &s390_fpregset;

- tdep->sizeof_fpregset = s390_sizeof_fpregset;

- set_gdbarch_addr_bits_remove (gdbarch, s390_addr_bits_remove);

- set_solib_svr4_fetch_link_map_offsets

- (gdbarch, svr4_ilp32_fetch_link_map_offsets);

- if (have_upper)

- {

- if (have_linux_v2)

- set_gdbarch_core_regset_sections (gdbarch,

- s390_linux64v2_regset_sections);

- else if (have_linux_v1)

- set_gdbarch_core_regset_sections (gdbarch,

- s390_linux64v1_regset_sections);

- else

- set_gdbarch_core_regset_sections (gdbarch,

- s390_linux64_regset_sections);

- }

- else

- {

- if (have_linux_v2)

- set_gdbarch_core_regset_sections (gdbarch,

- s390_linux32v2_regset_sections);

- else if (have_linux_v1)

- set_gdbarch_core_regset_sections (gdbarch,

- s390_linux32v1_regset_sections);

- else

- set_gdbarch_core_regset_sections (gdbarch,

- s390_linux32_regset_sections);

- }

- break;

- case ABI_LINUX_ZSERIES:

- tdep->gregset = &s390x_gregset;

- tdep->sizeof_gregset = s390x_sizeof_gregset;

- tdep->fpregset = &s390_fpregset;

- tdep->sizeof_fpregset = s390_sizeof_fpregset;

- set_gdbarch_long_bit (gdbarch, 64);

- set_gdbarch_long_long_bit (gdbarch, 64);

- set_gdbarch_ptr_bit (gdbarch, 64);

- set_solib_svr4_fetch_link_map_offsets

- (gdbarch, svr4_lp64_fetch_link_map_offsets);

- set_gdbarch_address_class_type_flags (gdbarch,

- s390_address_class_type_flags);

- set_gdbarch_address_class_type_flags_to_name (gdbarch,

- s390_address_class_type_flags_to_name);

- set_gdbarch_address_class_name_to_type_flags (gdbarch,

- s390_address_class_name_to_type_flags);

- if (have_linux_v2)

- set_gdbarch_core_regset_sections (gdbarch,

- s390x_linux64v2_regset_sections);

- else if (have_linux_v1)

- set_gdbarch_core_regset_sections (gdbarch,

- s390x_linux64v1_regset_sections);

- else

- set_gdbarch_core_regset_sections (gdbarch,

- s390x_linux64_regset_sections);

- break;

- }

- set_gdbarch_print_insn (gdbarch, print_insn_s390);

- set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);

- /* Enable TLS support. */

- set_gdbarch_fetch_tls_load_module_address (gdbarch,

- svr4_fetch_objfile_link_map);

- set_gdbarch_get_siginfo_type (gdbarch, linux_get_siginfo_type);

- /* SystemTap functions. */

- set_gdbarch_stap_register_prefix (gdbarch, "%");

- set_gdbarch_stap_register_indirection_prefix (gdbarch, "(");

- set_gdbarch_stap_register_indirection_suffix (gdbarch, ")");

- set_gdbarch_stap_is_single_operand (gdbarch, s390_stap_is_single_operand);

- return gdbarch;

-extern initialize_file_ftype _initialize_s390_tdep; /* -Wmissing-prototypes */

-void

-_initialize_s390_tdep (void)

- /* Hook us into the gdbarch mechanism. */

- register_gdbarch_init (bfd_arch_s390, s390_gdbarch_init);

- /* Initialize the GNU/Linux target descriptions. */

- initialize_tdesc_s390_linux32 ();

- initialize_tdesc_s390_linux32v1 ();

- initialize_tdesc_s390_linux32v2 ();

- initialize_tdesc_s390_linux64 ();

- initialize_tdesc_s390_linux64v1 ();

- initialize_tdesc_s390_linux64v2 ();

- initialize_tdesc_s390x_linux64 ();

- initialize_tdesc_s390x_linux64v1 ();

- initialize_tdesc_s390x_linux64v2 ();

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