2009-08-17 Michael Snyder <msnyder@vmware.com>
* amd64-tdep.c: Add a frame unwinder for function epilogues. (amd64_in_function_epilogue_p): New function. (amd64_epilogue_frame_sniffer): New function. (amd64_epilogue_frame_cache): New function. (amd64_epilogue_frame_this_id): New function. (amd64_epilogue_frame_unwind): New struct frame_unwind. (amd64_init_abi): Hook the new unwinder. * amd64-linux-tdep.c (amd64_linux_init_abi): Set gdbarch to use SVR4 method for skip_trampoline_code.
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@ -1,3 +1,16 @@
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2009-08-17 Michael Snyder <msnyder@vmware.com>
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* amd64-tdep.c: Add a frame unwinder for function epilogues.
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(amd64_in_function_epilogue_p): New function.
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(amd64_epilogue_frame_sniffer): New function.
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(amd64_epilogue_frame_cache): New function.
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(amd64_epilogue_frame_this_id): New function.
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(amd64_epilogue_frame_unwind): New struct frame_unwind.
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(amd64_init_abi): Hook the new unwinder.
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* amd64-linux-tdep.c (amd64_linux_init_abi): Set gdbarch to use
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SVR4 method for skip_trampoline_code.
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2009-08-17 Pedro Alves <pedro@codesourcery.com>>
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* objfiles.c (objfile_relocate): Relocate the entry point before
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@ -1415,6 +1415,9 @@ amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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/* GNU/Linux uses SVR4-style shared libraries. */
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set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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/* Displaced stepping. */
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set_gdbarch_displaced_step_copy_insn (gdbarch,
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amd64_displaced_step_copy_insn);
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@ -1887,6 +1887,89 @@ static const struct frame_base amd64_frame_base =
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amd64_frame_base_address
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};
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/* Normal frames, but in a function epilogue. */
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/* The epilogue is defined here as the 'ret' instruction, which will
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follow any instruction such as 'leave' or 'pop %ebp' that destroys
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the function's stack frame. */
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static int
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amd64_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
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{
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gdb_byte insn;
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if (target_read_memory (pc, &insn, 1))
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return 0; /* Can't read memory at pc. */
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if (insn != 0xc3) /* 'ret' instruction. */
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return 0;
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return 1;
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}
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static int
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amd64_epilogue_frame_sniffer (const struct frame_unwind *self,
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struct frame_info *this_frame,
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void **this_prologue_cache)
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{
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if (frame_relative_level (this_frame) == 0)
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return amd64_in_function_epilogue_p (get_frame_arch (this_frame),
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get_frame_pc (this_frame));
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else
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return 0;
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}
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static struct amd64_frame_cache *
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amd64_epilogue_frame_cache (struct frame_info *this_frame, void **this_cache)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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struct amd64_frame_cache *cache;
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gdb_byte buf[4];
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if (*this_cache)
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return *this_cache;
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cache = amd64_alloc_frame_cache ();
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*this_cache = cache;
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/* Cache base will be %esp plus cache->sp_offset (-8). */
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get_frame_register (this_frame, AMD64_RSP_REGNUM, buf);
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cache->base = extract_unsigned_integer (buf, 8,
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byte_order) + cache->sp_offset;
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/* Cache pc will be the frame func. */
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cache->pc = get_frame_pc (this_frame);
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/* The saved %esp will be at cache->base plus 16. */
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cache->saved_sp = cache->base + 16;
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/* The saved %eip will be at cache->base plus 8. */
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cache->saved_regs[AMD64_RIP_REGNUM] = cache->base + 8;
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return cache;
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}
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static void
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amd64_epilogue_frame_this_id (struct frame_info *this_frame,
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void **this_cache,
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struct frame_id *this_id)
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{
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struct amd64_frame_cache *cache = amd64_epilogue_frame_cache (this_frame,
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this_cache);
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(*this_id) = frame_id_build (cache->base + 8, cache->pc);
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}
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static const struct frame_unwind amd64_epilogue_frame_unwind =
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{
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NORMAL_FRAME,
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amd64_epilogue_frame_this_id,
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amd64_frame_prev_register,
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NULL,
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amd64_epilogue_frame_sniffer
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};
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static struct frame_id
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amd64_dummy_id (struct gdbarch *gdbarch, struct frame_info *this_frame)
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{
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@ -2065,6 +2148,12 @@ amd64_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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set_gdbarch_dummy_id (gdbarch, amd64_dummy_id);
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/* Hook the function epilogue frame unwinder. This unwinder is
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appended to the list first, so that it supercedes the other
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unwinders in function epilogues. */
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frame_unwind_prepend_unwinder (gdbarch, &amd64_epilogue_frame_unwind);
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/* Hook the prologue-based frame unwinders. */
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frame_unwind_append_unwinder (gdbarch, &amd64_sigtramp_frame_unwind);
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frame_unwind_append_unwinder (gdbarch, &amd64_frame_unwind);
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frame_base_set_default (gdbarch, &amd64_frame_base);
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