GDB 7.6.50

gdb/nios2-linux-tdep.c

Index: gdb/nios2-linux-tdep.c
diff --git a/gdb/nios2-linux-tdep.c b/gdb/nios2-linux-tdep.c
new file mode 100644
index 0000000000000000000000000000000000000000..fe29e7a72666bfc8ef27842b4b0beab672a23eca
--- /dev/null
+++ b/gdb/nios2-linux-tdep.c
@@ -0,0 +1,233 @@
+/* Target-dependent code for GNU/Linux on Nios II.
+   Copyright (C) 2012-2013 Free Software Foundation, Inc.
+   Contributed by Mentor Graphics, Inc.
+
+   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 "frame.h"
+#include "gdb_assert.h"
+#include <string.h>
+#include "osabi.h"
+#include "solib-svr4.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
+#include "symtab.h"
+#include "regset.h"
+#include "regcache.h"
+#include "linux-tdep.h"
+#include "glibc-tdep.h"
+#include "nios2-tdep.h"
+
+#include "features/nios2-linux.c"
+
+/* Core file and register set support.  */
+
+/* Map from the normal register enumeration order to the order that
+   registers appear in core files, which corresponds to the order
+   of the register slots in the kernel's struct pt_regs.  */
+
+static const int reg_offsets[NIOS2_NUM_REGS] =
+{
+  -1,  8,  9, 10, 11, 12, 13, 14,	/* r0 - r7 */
+  0,  1,  2,  3,  4,  5,  6,  7,	/* r8 - r15 */
+  23, 24, 25, 26, 27, 28, 29, 30,	/* r16 - r23 */
+  -1, -1, 19, 18, 17, 21, -1, 16,	/* et bt gp sp fp ea sstatus ra */
+  21,					/* pc */
+  -1, 20, -1, -1, -1, -1, -1, -1,	/* status estatus ...  */
+  -1, -1, -1, -1, -1, -1, -1, -1
+};
+
+/* Implement the supply_regset hook for core files.  */
+
+static void
+nios2_supply_gregset (const struct regset *regset,
+		      struct regcache *regcache,
+		      int regnum, const void *gregs_buf, size_t len)
+{
+  const gdb_byte *gregs = gregs_buf;
+  int regno;
+  static const gdb_byte zero_buf[4] = {0, 0, 0, 0};
+
+  for (regno = NIOS2_Z_REGNUM; regno <= NIOS2_MPUACC_REGNUM; regno++)
+    if (regnum == -1 || regnum == regno)
+      {
+	if (reg_offsets[regno] != -1)
+	  regcache_raw_supply (regcache, regno,
+			       gregs + 4 * reg_offsets[regno]);
+	else
+	  regcache_raw_supply (regcache, regno, zero_buf);
+      }
+}
+
+static struct regset nios2_core_regset =
+{
+  NULL,
+  nios2_supply_gregset,
+  NULL,
+  NULL
+};
+
+/* Implement the regset_from_core_section gdbarch method.  */
+
+static const struct regset *
+nios2_regset_from_core_section (struct gdbarch *gdbarch,
+                                const char *sect_name, size_t sect_size)
+{
+  if (strcmp (sect_name, ".reg") == 0)
+    return &nios2_core_regset;
+
+  return NULL;
+}
+
+/* Initialize a trad-frame cache corresponding to the tramp-frame.
+   FUNC is the address of the instruction TRAMP[0] in memory.  */
+
+static void
+nios2_linux_sigreturn_init (const struct tramp_frame *self,
+			    struct frame_info *next_frame,
+			    struct trad_frame_cache *this_cache,
+			    CORE_ADDR func)
+{
+  CORE_ADDR base = func + 16;
+  int i;
+
+  for (i = 0; i < 8; i++)
+    trad_frame_set_reg_addr (this_cache, i + 8, base + i * 4);
+  for (i = 0; i < 7; i++)
+    trad_frame_set_reg_addr (this_cache, i + 1, base + (i + 8) * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 16 * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 17 * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 18 * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 19 * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_ESTATUS_REGNUM, base + 20 * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 21 * 4);
+
+  /* Save a frame ID.  */
+  trad_frame_set_id (this_cache, frame_id_build (base, func));
+}
+
+/* Initialize a trad-frame cache corresponding to the tramp-frame.
+   FUNC is the address of the instruction TRAMP[0] in memory.  */
+
+static void
+nios2_linux_rt_sigreturn_init (const struct tramp_frame *self,
+			       struct frame_info *next_frame,
+			       struct trad_frame_cache *this_cache,
+			       CORE_ADDR func)
+{
+  CORE_ADDR base = func + 41 * 4;
+  int i;
+
+  for (i = 0; i < 23; i++)
+    trad_frame_set_reg_addr (this_cache, i + 1, base + i * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_RA_REGNUM, base + 23 * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_FP_REGNUM, base + 24 * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_GP_REGNUM, base + 25 * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_PC_REGNUM, base + 27 * 4);
+  trad_frame_set_reg_addr (this_cache, NIOS2_SP_REGNUM, base + 28 * 4);
+
+  /* Save a frame ID.  */
+  trad_frame_set_id (this_cache, frame_id_build (base, func));
+}
+
+static struct tramp_frame nios2_linux_sigreturn_tramp_frame =
+{
+  SIGTRAMP_FRAME,
+  4,
+  {
+    { 0x00800004 | (119 << 6), -1 },  /* movi r2,__NR_sigreturn */
+    { 0x003b683a, -1 },               /* trap */
+    { TRAMP_SENTINEL_INSN }
+  },
+  nios2_linux_sigreturn_init
+};
+
+static struct tramp_frame nios2_linux_rt_sigreturn_tramp_frame =
+{
+  SIGTRAMP_FRAME,
+  4,
+  {
+    { 0x00800004 | (173 << 6), -1 },  /* movi r2,__NR_rt_sigreturn */
+    { 0x003b683a, -1 },               /* trap */
+    { TRAMP_SENTINEL_INSN }
+  },
+  nios2_linux_rt_sigreturn_init
+};
+
+/* When FRAME is at a syscall instruction, return the PC of the next
+   instruction to be executed.  */
+
+static CORE_ADDR
+nios2_linux_syscall_next_pc (struct frame_info *frame)
+{
+  CORE_ADDR pc = get_frame_pc (frame);
+  ULONGEST syscall_nr = get_frame_register_unsigned (frame, NIOS2_R2_REGNUM);
+
+  /* If we are about to make a sigreturn syscall, use the unwinder to
+     decode the signal frame.  */
+  if (syscall_nr == 119 /* sigreturn */
+      || syscall_nr == 173 /* rt_sigreturn */)
+    return frame_unwind_caller_pc (frame);
+
+  return pc + NIOS2_OPCODE_SIZE;
+}
+
+/* Hook function for gdbarch_register_osabi.  */
+
+static void
+nios2_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  linux_init_abi (info, gdbarch);
+
+  /* Shared library handling.  */
+  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+  set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
+
+  set_solib_svr4_fetch_link_map_offsets (gdbarch,
+					 svr4_ilp32_fetch_link_map_offsets);
+  /* Enable TLS support.  */
+  set_gdbarch_fetch_tls_load_module_address (gdbarch,
+                                             svr4_fetch_objfile_link_map);
+  /* Core file support.  */
+  set_gdbarch_regset_from_core_section (gdbarch,
+                                        nios2_regset_from_core_section);
+  /* Linux signal frame unwinders.  */
+  tramp_frame_prepend_unwinder (gdbarch,
+                                &nios2_linux_sigreturn_tramp_frame);
+  tramp_frame_prepend_unwinder (gdbarch,
+                                &nios2_linux_rt_sigreturn_tramp_frame);
+
+  tdep->syscall_next_pc = nios2_linux_syscall_next_pc;
+
+  /* Index of target address word in glibc jmp_buf.  */
+  tdep->jb_pc = 10;
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+
+extern initialize_file_ftype _initialize_nios2_linux_tdep;
+
+void
+_initialize_nios2_linux_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_nios2, 0, GDB_OSABI_LINUX,
+                          nios2_linux_init_abi);
+
+  initialize_tdesc_nios2_linux ();
+}