Index: gdb/ppc64-tdep.c |
diff --git a/gdb/ppc64-tdep.c b/gdb/ppc64-tdep.c |
new file mode 100644 |
index 0000000000000000000000000000000000000000..174ab7c253fff138a807b157af571c577848ab71 |
--- /dev/null |
+++ b/gdb/ppc64-tdep.c |
@@ -0,0 +1,554 @@ |
+/* Common target-dependent code for ppc64 GDB, the GNU debugger. |
+ |
+ Copyright (C) 1986-2013 Free Software Foundation, 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 "gdbcore.h" |
+#include "ppc-tdep.h" |
+#include "ppc64-tdep.h" |
+#include "elf-bfd.h" |
+ |
+/* Macros for matching instructions. Note that, since all the |
+ operands are masked off before they're or-ed into the instruction, |
+ you can use -1 to make masks. */ |
+ |
+#define insn_d(opcd, rts, ra, d) \ |
+ ((((opcd) & 0x3f) << 26) \ |
+ | (((rts) & 0x1f) << 21) \ |
+ | (((ra) & 0x1f) << 16) \ |
+ | ((d) & 0xffff)) |
+ |
+#define insn_ds(opcd, rts, ra, d, xo) \ |
+ ((((opcd) & 0x3f) << 26) \ |
+ | (((rts) & 0x1f) << 21) \ |
+ | (((ra) & 0x1f) << 16) \ |
+ | ((d) & 0xfffc) \ |
+ | ((xo) & 0x3)) |
+ |
+#define insn_xfx(opcd, rts, spr, xo) \ |
+ ((((opcd) & 0x3f) << 26) \ |
+ | (((rts) & 0x1f) << 21) \ |
+ | (((spr) & 0x1f) << 16) \ |
+ | (((spr) & 0x3e0) << 6) \ |
+ | (((xo) & 0x3ff) << 1)) |
+ |
+/* If PLT is the address of a 64-bit PowerPC PLT entry, |
+ return the function's entry point. */ |
+ |
+static CORE_ADDR |
+ppc64_plt_entry_point (struct gdbarch *gdbarch, CORE_ADDR plt) |
+{ |
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
+ /* The first word of the PLT entry is the function entry point. */ |
+ return (CORE_ADDR) read_memory_unsigned_integer (plt, 8, byte_order); |
+} |
+ |
+/* Patterns for the standard linkage functions. These are built by |
+ build_plt_stub in bfd/elf64-ppc.c. */ |
+ |
+/* Old ELFv1 PLT call stub. */ |
+ |
+static struct ppc_insn_pattern ppc64_standard_linkage1[] = |
+ { |
+ /* addis r12, r2, <any> */ |
+ { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 }, |
+ |
+ /* std r2, 40(r1) */ |
+ { -1, insn_ds (62, 2, 1, 40, 0), 0 }, |
+ |
+ /* ld r11, <any>(r12) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, |
+ |
+ /* addis r12, r12, 1 <optional> */ |
+ { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 }, |
+ |
+ /* ld r2, <any>(r12) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 }, |
+ |
+ /* addis r12, r12, 1 <optional> */ |
+ { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 }, |
+ |
+ /* mtctr r11 */ |
+ { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, |
+ |
+ /* ld r11, <any>(r12) <optional> */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 1 }, |
+ |
+ /* bctr */ |
+ { -1, 0x4e800420, 0 }, |
+ |
+ { 0, 0, 0 } |
+ }; |
+ |
+/* ELFv1 PLT call stub to access PLT entries more than +/- 32k from r2. |
+ Also supports older stub with different placement of std 2,40(1), |
+ a stub that omits the std 2,40(1), and both versions of power7 |
+ thread safety read barriers. Note that there are actually two more |
+ instructions following "cmpldi r2, 0", "bnectr+" and "b <glink_i>", |
+ but there isn't any need to match them. */ |
+ |
+static struct ppc_insn_pattern ppc64_standard_linkage2[] = |
+ { |
+ /* std r2, 40(r1) <optional> */ |
+ { -1, insn_ds (62, 2, 1, 40, 0), 1 }, |
+ |
+ /* addis r12, r2, <any> */ |
+ { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 }, |
+ |
+ /* std r2, 40(r1) <optional> */ |
+ { -1, insn_ds (62, 2, 1, 40, 0), 1 }, |
+ |
+ /* ld r11, <any>(r12) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, |
+ |
+ /* addi r12, r12, <any> <optional> */ |
+ { insn_d (-1, -1, -1, 0), insn_d (14, 12, 12, 0), 1 }, |
+ |
+ /* mtctr r11 */ |
+ { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, |
+ |
+ /* xor r11, r11, r11 <optional> */ |
+ { -1, 0x7d6b5a78, 1 }, |
+ |
+ /* add r12, r12, r11 <optional> */ |
+ { -1, 0x7d8c5a14, 1 }, |
+ |
+ /* ld r2, <any>(r12) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 }, |
+ |
+ /* ld r11, <any>(r12) <optional> */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 1 }, |
+ |
+ /* bctr <optional> */ |
+ { -1, 0x4e800420, 1 }, |
+ |
+ /* cmpldi r2, 0 <optional> */ |
+ { -1, 0x28220000, 1 }, |
+ |
+ { 0, 0, 0 } |
+ }; |
+ |
+/* ELFv1 PLT call stub to access PLT entries within +/- 32k of r2. */ |
+ |
+static struct ppc_insn_pattern ppc64_standard_linkage3[] = |
+ { |
+ /* std r2, 40(r1) <optional> */ |
+ { -1, insn_ds (62, 2, 1, 40, 0), 1 }, |
+ |
+ /* ld r11, <any>(r2) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 }, |
+ |
+ /* addi r2, r2, <any> <optional> */ |
+ { insn_d (-1, -1, -1, 0), insn_d (14, 2, 2, 0), 1 }, |
+ |
+ /* mtctr r11 */ |
+ { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, |
+ |
+ /* xor r11, r11, r11 <optional> */ |
+ { -1, 0x7d6b5a78, 1 }, |
+ |
+ /* add r2, r2, r11 <optional> */ |
+ { -1, 0x7c425a14, 1 }, |
+ |
+ /* ld r11, <any>(r2) <optional> */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 1 }, |
+ |
+ /* ld r2, <any>(r2) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 }, |
+ |
+ /* bctr <optional> */ |
+ { -1, 0x4e800420, 1 }, |
+ |
+ /* cmpldi r2, 0 <optional> */ |
+ { -1, 0x28220000, 1 }, |
+ |
+ { 0, 0, 0 } |
+ }; |
+ |
+/* ELFv1 PLT call stub to access PLT entries more than +/- 32k from r2. |
+ A more modern variant of ppc64_standard_linkage2 differing in |
+ register usage. */ |
+ |
+static struct ppc_insn_pattern ppc64_standard_linkage4[] = |
+ { |
+ /* std r2, 40(r1) <optional> */ |
+ { -1, insn_ds (62, 2, 1, 40, 0), 1 }, |
+ |
+ /* addis r11, r2, <any> */ |
+ { insn_d (-1, -1, -1, 0), insn_d (15, 11, 2, 0), 0 }, |
+ |
+ /* ld r12, <any>(r11) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 12, 11, 0, 0), 0 }, |
+ |
+ /* addi r11, r11, <any> <optional> */ |
+ { insn_d (-1, -1, -1, 0), insn_d (14, 11, 11, 0), 1 }, |
+ |
+ /* mtctr r12 */ |
+ { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 12, 9, 467), 0 }, |
+ |
+ /* xor r2, r12, r12 <optional> */ |
+ { -1, 0x7d826278, 1 }, |
+ |
+ /* add r11, r11, r2 <optional> */ |
+ { -1, 0x7d6b1214, 1 }, |
+ |
+ /* ld r2, <any>(r11) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 11, 0, 0), 0 }, |
+ |
+ /* ld r11, <any>(r11) <optional> */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 11, 0, 0), 1 }, |
+ |
+ /* bctr <optional> */ |
+ { -1, 0x4e800420, 1 }, |
+ |
+ /* cmpldi r2, 0 <optional> */ |
+ { -1, 0x28220000, 1 }, |
+ |
+ { 0, 0, 0 } |
+ }; |
+ |
+/* ELFv1 PLT call stub to access PLT entries within +/- 32k of r2. |
+ A more modern variant of ppc64_standard_linkage3 differing in |
+ register usage. */ |
+ |
+static struct ppc_insn_pattern ppc64_standard_linkage5[] = |
+ { |
+ /* std r2, 40(r1) <optional> */ |
+ { -1, insn_ds (62, 2, 1, 40, 0), 1 }, |
+ |
+ /* ld r12, <any>(r2) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 12, 2, 0, 0), 0 }, |
+ |
+ /* addi r2, r2, <any> <optional> */ |
+ { insn_d (-1, -1, -1, 0), insn_d (14, 2, 2, 0), 1 }, |
+ |
+ /* mtctr r12 */ |
+ { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 12, 9, 467), 0 }, |
+ |
+ /* xor r11, r12, r12 <optional> */ |
+ { -1, 0x7d8b6278, 1 }, |
+ |
+ /* add r2, r2, r11 <optional> */ |
+ { -1, 0x7c425a14, 1 }, |
+ |
+ /* ld r11, <any>(r2) <optional> */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 1 }, |
+ |
+ /* ld r2, <any>(r2) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 }, |
+ |
+ /* bctr <optional> */ |
+ { -1, 0x4e800420, 1 }, |
+ |
+ /* cmpldi r2, 0 <optional> */ |
+ { -1, 0x28220000, 1 }, |
+ |
+ { 0, 0, 0 } |
+ }; |
+ |
+/* ELFv2 PLT call stub to access PLT entries more than +/- 32k from r2. */ |
+ |
+static struct ppc_insn_pattern ppc64_standard_linkage6[] = |
+ { |
+ /* std r2, 24(r1) <optional> */ |
+ { -1, insn_ds (62, 2, 1, 24, 0), 1 }, |
+ |
+ /* addis r11, r2, <any> */ |
+ { insn_d (-1, -1, -1, 0), insn_d (15, 11, 2, 0), 0 }, |
+ |
+ /* ld r12, <any>(r11) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 12, 11, 0, 0), 0 }, |
+ |
+ /* mtctr r12 */ |
+ { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 12, 9, 467), 0 }, |
+ |
+ /* bctr */ |
+ { -1, 0x4e800420, 0 }, |
+ |
+ { 0, 0, 0 } |
+ }; |
+ |
+/* ELFv2 PLT call stub to access PLT entries within +/- 32k of r2. */ |
+ |
+static struct ppc_insn_pattern ppc64_standard_linkage7[] = |
+ { |
+ /* std r2, 24(r1) <optional> */ |
+ { -1, insn_ds (62, 2, 1, 40, 0), 1 }, |
+ |
+ /* ld r12, <any>(r2) */ |
+ { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 12, 2, 0, 0), 0 }, |
+ |
+ /* mtctr r12 */ |
+ { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 12, 9, 467), 0 }, |
+ |
+ /* bctr */ |
+ { -1, 0x4e800420, 0 }, |
+ |
+ { 0, 0, 0 } |
+ }; |
+ |
+/* When the dynamic linker is doing lazy symbol resolution, the first |
+ call to a function in another object will go like this: |
+ |
+ - The user's function calls the linkage function: |
+ |
+ 100003d4: 4b ff ff ad bl 10000380 <nnnn.plt_call.printf> |
+ 100003d8: e8 41 00 28 ld r2,40(r1) |
+ |
+ - The linkage function loads the entry point and toc pointer from |
+ the function descriptor in the PLT, and jumps to it: |
+ |
+ <nnnn.plt_call.printf>: |
+ 10000380: f8 41 00 28 std r2,40(r1) |
+ 10000384: e9 62 80 78 ld r11,-32648(r2) |
+ 10000388: 7d 69 03 a6 mtctr r11 |
+ 1000038c: e8 42 80 80 ld r2,-32640(r2) |
+ 10000390: 28 22 00 00 cmpldi r2,0 |
+ 10000394: 4c e2 04 20 bnectr+ |
+ 10000398: 48 00 03 a0 b 10000738 <printf@plt> |
+ |
+ - But since this is the first time that PLT entry has been used, it |
+ sends control to its glink entry. That loads the number of the |
+ PLT entry and jumps to the common glink0 code: |
+ |
+ <printf@plt>: |
+ 10000738: 38 00 00 01 li r0,1 |
+ 1000073c: 4b ff ff bc b 100006f8 <__glink_PLTresolve> |
+ |
+ - The common glink0 code then transfers control to the dynamic |
+ linker's fixup code: |
+ |
+ 100006f0: 0000000000010440 .quad plt0 - (. + 16) |
+ <__glink_PLTresolve>: |
+ 100006f8: 7d 88 02 a6 mflr r12 |
+ 100006fc: 42 9f 00 05 bcl 20,4*cr7+so,10000700 |
+ 10000700: 7d 68 02 a6 mflr r11 |
+ 10000704: e8 4b ff f0 ld r2,-16(r11) |
+ 10000708: 7d 88 03 a6 mtlr r12 |
+ 1000070c: 7d 82 5a 14 add r12,r2,r11 |
+ 10000710: e9 6c 00 00 ld r11,0(r12) |
+ 10000714: e8 4c 00 08 ld r2,8(r12) |
+ 10000718: 7d 69 03 a6 mtctr r11 |
+ 1000071c: e9 6c 00 10 ld r11,16(r12) |
+ 10000720: 4e 80 04 20 bctr |
+ |
+ Eventually, this code will figure out how to skip all of this, |
+ including the dynamic linker. At the moment, we just get through |
+ the linkage function. */ |
+ |
+/* If the current thread is about to execute a series of instructions |
+ at PC matching the ppc64_standard_linkage pattern, and INSN is the result |
+ from that pattern match, return the code address to which the |
+ standard linkage function will send them. (This doesn't deal with |
+ dynamic linker lazy symbol resolution stubs.) */ |
+ |
+static CORE_ADDR |
+ppc64_standard_linkage1_target (struct frame_info *frame, |
+ CORE_ADDR pc, unsigned int *insn) |
+{ |
+ struct gdbarch *gdbarch = get_frame_arch (frame); |
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
+ |
+ /* The address of the PLT entry this linkage function references. */ |
+ CORE_ADDR plt |
+ = ((CORE_ADDR) get_frame_register_unsigned (frame, |
+ tdep->ppc_gp0_regnum + 2) |
+ + (ppc_insn_d_field (insn[0]) << 16) |
+ + ppc_insn_ds_field (insn[2])); |
+ |
+ return ppc64_plt_entry_point (gdbarch, plt); |
+} |
+ |
+static CORE_ADDR |
+ppc64_standard_linkage2_target (struct frame_info *frame, |
+ CORE_ADDR pc, unsigned int *insn) |
+{ |
+ struct gdbarch *gdbarch = get_frame_arch (frame); |
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
+ |
+ /* The address of the PLT entry this linkage function references. */ |
+ CORE_ADDR plt |
+ = ((CORE_ADDR) get_frame_register_unsigned (frame, |
+ tdep->ppc_gp0_regnum + 2) |
+ + (ppc_insn_d_field (insn[1]) << 16) |
+ + ppc_insn_ds_field (insn[3])); |
+ |
+ return ppc64_plt_entry_point (gdbarch, plt); |
+} |
+ |
+static CORE_ADDR |
+ppc64_standard_linkage3_target (struct frame_info *frame, |
+ CORE_ADDR pc, unsigned int *insn) |
+{ |
+ struct gdbarch *gdbarch = get_frame_arch (frame); |
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
+ |
+ /* The address of the PLT entry this linkage function references. */ |
+ CORE_ADDR plt |
+ = ((CORE_ADDR) get_frame_register_unsigned (frame, |
+ tdep->ppc_gp0_regnum + 2) |
+ + ppc_insn_ds_field (insn[1])); |
+ |
+ return ppc64_plt_entry_point (gdbarch, plt); |
+} |
+ |
+static CORE_ADDR |
+ppc64_standard_linkage4_target (struct frame_info *frame, |
+ CORE_ADDR pc, unsigned int *insn) |
+{ |
+ struct gdbarch *gdbarch = get_frame_arch (frame); |
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
+ |
+ CORE_ADDR plt |
+ = ((CORE_ADDR) get_frame_register_unsigned (frame, tdep->ppc_gp0_regnum + 2) |
+ + (ppc_insn_d_field (insn[1]) << 16) |
+ + ppc_insn_ds_field (insn[2])); |
+ |
+ return ppc64_plt_entry_point (gdbarch, plt); |
+} |
+ |
+ |
+/* Given that we've begun executing a call trampoline at PC, return |
+ the entry point of the function the trampoline will go to. */ |
+ |
+CORE_ADDR |
+ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
+{ |
+#define MAX(a,b) ((a) > (b) ? (a) : (b)) |
+ unsigned int insns[MAX (MAX (MAX (ARRAY_SIZE (ppc64_standard_linkage1), |
+ ARRAY_SIZE (ppc64_standard_linkage2)), |
+ MAX (ARRAY_SIZE (ppc64_standard_linkage3), |
+ ARRAY_SIZE (ppc64_standard_linkage4))), |
+ MAX (MAX (ARRAY_SIZE (ppc64_standard_linkage5), |
+ ARRAY_SIZE (ppc64_standard_linkage6)), |
+ ARRAY_SIZE (ppc64_standard_linkage7))) - 1]; |
+ CORE_ADDR target; |
+ |
+ if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage7, insns)) |
+ pc = ppc64_standard_linkage3_target (frame, pc, insns); |
+ else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage6, insns)) |
+ pc = ppc64_standard_linkage4_target (frame, pc, insns); |
+ else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage5, insns) |
+ && (insns[8] != 0 || insns[9] != 0)) |
+ pc = ppc64_standard_linkage3_target (frame, pc, insns); |
+ else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage4, insns) |
+ && (insns[9] != 0 || insns[10] != 0)) |
+ pc = ppc64_standard_linkage4_target (frame, pc, insns); |
+ else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage3, insns) |
+ && (insns[8] != 0 || insns[9] != 0)) |
+ pc = ppc64_standard_linkage3_target (frame, pc, insns); |
+ else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage2, insns) |
+ && (insns[10] != 0 || insns[11] != 0)) |
+ pc = ppc64_standard_linkage2_target (frame, pc, insns); |
+ else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage1, insns)) |
+ pc = ppc64_standard_linkage1_target (frame, pc, insns); |
+ else |
+ return 0; |
+ |
+ /* The PLT descriptor will either point to the already resolved target |
+ address, or else to a glink stub. As the latter carry synthetic @plt |
+ symbols, find_solib_trampoline_target should be able to resolve them. */ |
+ target = find_solib_trampoline_target (frame, pc); |
+ return target ? target : pc; |
+} |
+ |
+/* Support for convert_from_func_ptr_addr (ARCH, ADDR, TARG) on PPC64 |
+ GNU/Linux. |
+ |
+ Usually a function pointer's representation is simply the address |
+ of the function. On GNU/Linux on the PowerPC however, a function |
+ pointer may be a pointer to a function descriptor. |
+ |
+ For PPC64, a function descriptor is a TOC entry, in a data section, |
+ which contains three words: the first word is the address of the |
+ function, the second word is the TOC pointer (r2), and the third word |
+ is the static chain value. |
+ |
+ Throughout GDB it is currently assumed that a function pointer contains |
+ the address of the function, which is not easy to fix. In addition, the |
+ conversion of a function address to a function pointer would |
+ require allocation of a TOC entry in the inferior's memory space, |
+ with all its drawbacks. To be able to call C++ virtual methods in |
+ the inferior (which are called via function pointers), |
+ find_function_addr uses this function to get the function address |
+ from a function pointer. |
+ |
+ If ADDR points at what is clearly a function descriptor, transform |
+ it into the address of the corresponding function, if needed. Be |
+ conservative, otherwise GDB will do the transformation on any |
+ random addresses such as occur when there is no symbol table. */ |
+ |
+CORE_ADDR |
+ppc64_convert_from_func_ptr_addr (struct gdbarch *gdbarch, |
+ CORE_ADDR addr, |
+ struct target_ops *targ) |
+{ |
+ enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
+ struct target_section *s = target_section_by_addr (targ, addr); |
+ |
+ /* Check if ADDR points to a function descriptor. */ |
+ if (s && strcmp (s->the_bfd_section->name, ".opd") == 0) |
+ { |
+ /* There may be relocations that need to be applied to the .opd |
+ section. Unfortunately, this function may be called at a time |
+ where these relocations have not yet been performed -- this can |
+ happen for example shortly after a library has been loaded with |
+ dlopen, but ld.so has not yet applied the relocations. |
+ |
+ To cope with both the case where the relocation has been applied, |
+ and the case where it has not yet been applied, we do *not* read |
+ the (maybe) relocated value from target memory, but we instead |
+ read the non-relocated value from the BFD, and apply the relocation |
+ offset manually. |
+ |
+ This makes the assumption that all .opd entries are always relocated |
+ by the same offset the section itself was relocated. This should |
+ always be the case for GNU/Linux executables and shared libraries. |
+ Note that other kind of object files (e.g. those added via |
+ add-symbol-files) will currently never end up here anyway, as this |
+ function accesses *target* sections only; only the main exec and |
+ shared libraries are ever added to the target. */ |
+ |
+ gdb_byte buf[8]; |
+ int res; |
+ |
+ res = bfd_get_section_contents (s->the_bfd_section->owner, |
+ s->the_bfd_section, |
+ &buf, addr - s->addr, 8); |
+ if (res != 0) |
+ return extract_unsigned_integer (buf, 8, byte_order) |
+ - bfd_section_vma (s->bfd, s->the_bfd_section) + s->addr; |
+ } |
+ |
+ return addr; |
+} |
+ |
+/* A synthetic 'dot' symbols on ppc64 has the udata.p entry pointing |
+ back to the original ELF symbol it was derived from. Get the size |
+ from that symbol. */ |
+ |
+void |
+ppc64_elf_make_msymbol_special (asymbol *sym, struct minimal_symbol *msym) |
+{ |
+ if ((sym->flags & BSF_SYNTHETIC) != 0 && sym->udata.p != NULL) |
+ { |
+ elf_symbol_type *elf_sym = (elf_symbol_type *) sym->udata.p; |
+ SET_MSYMBOL_SIZE (msym, elf_sym->internal_elf_sym.st_size); |
+ } |
+} |