X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fppc64-tdep.c;h=4a0b93a5bf8771d57bce255465f58e72fab1bb8d;hb=141c5cc4c44a6ce1a5c628c0f4849a8b1c91d383;hp=cbbbedc070ccfeb3f29f136c9567e5607f474c12;hpb=fa0079ea727e512d592fff1241a82a0a2f628903;p=deliverable%2Fbinutils-gdb.git diff --git a/gdb/ppc64-tdep.c b/gdb/ppc64-tdep.c index cbbbedc070..4a0b93a5bf 100644 --- a/gdb/ppc64-tdep.c +++ b/gdb/ppc64-tdep.c @@ -1,6 +1,6 @@ /* Common target-dependent code for ppc64 GDB, the GNU debugger. - Copyright (C) 1986-2014 Free Software Foundation, Inc. + Copyright (C) 1986-2015 Free Software Foundation, Inc. This file is part of GDB. @@ -20,6 +20,7 @@ #include "defs.h" #include "frame.h" #include "gdbcore.h" +#include "infrun.h" #include "ppc-tdep.h" #include "ppc64-tdep.h" #include "elf-bfd.h" @@ -303,6 +304,29 @@ static struct ppc_insn_pattern ppc64_standard_linkage7[] = { 0, 0, 0 } }; +/* ELFv2 PLT call stub to access PLT entries more than +/- 32k from r2, + supporting fusion. */ + +static struct ppc_insn_pattern ppc64_standard_linkage8[] = + { + /* std r2, 24(r1) */ + { -1, insn_ds (62, 2, 1, 24, 0), 1 }, + + /* addis r12, r2, */ + { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 }, + + /* ld r12, (r12) */ + { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 12, 12, 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: @@ -425,10 +449,13 @@ ppc64_standard_linkage4_target (struct frame_info *frame, /* Given that we've begun executing a call trampoline at PC, return - the entry point of the function the trampoline will go to. */ + the entry point of the function the trampoline will go to. -CORE_ADDR -ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) + When the execution direction is EXEC_REVERSE, scan backward to + check whether we are in the middle of a PLT stub. */ + +static CORE_ADDR +ppc64_skip_trampoline_code_1 (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), @@ -437,35 +464,84 @@ ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) ARRAY_SIZE (ppc64_standard_linkage4))), MAX (MAX (ARRAY_SIZE (ppc64_standard_linkage5), ARRAY_SIZE (ppc64_standard_linkage6)), - ARRAY_SIZE (ppc64_standard_linkage7))) - 1]; + MAX (ARRAY_SIZE (ppc64_standard_linkage7), + ARRAY_SIZE (ppc64_standard_linkage8)))) + - 1]; CORE_ADDR target; + int scan_limit, i; + + scan_limit = 1; + /* When reverse-debugging, scan backward to check whether we are + in the middle of trampoline code. */ + if (execution_direction == EXEC_REVERSE) + scan_limit = ARRAY_SIZE (insns) - 1; + + for (i = 0; i < scan_limit; i++) + { + if (i < ARRAY_SIZE (ppc64_standard_linkage8) - 1 + && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage8, insns)) + pc = ppc64_standard_linkage4_target (frame, pc, insns); + else if (i < ARRAY_SIZE (ppc64_standard_linkage7) - 1 + && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage7, + insns)) + pc = ppc64_standard_linkage3_target (frame, pc, insns); + else if (i < ARRAY_SIZE (ppc64_standard_linkage6) - 1 + && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage6, + insns)) + pc = ppc64_standard_linkage4_target (frame, pc, insns); + else if (i < ARRAY_SIZE (ppc64_standard_linkage5) - 1 + && 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 (i < ARRAY_SIZE (ppc64_standard_linkage4) - 1 + && 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 (i < ARRAY_SIZE (ppc64_standard_linkage3) - 1 + && 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 (i < ARRAY_SIZE (ppc64_standard_linkage2) - 1 + && 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 (i < ARRAY_SIZE (ppc64_standard_linkage1) - 1 + && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage1, + insns)) + pc = ppc64_standard_linkage1_target (frame, pc, insns); + else + { + /* Scan backward one more instructions if doesn't match. */ + pc -= 4; + continue; + } + + /* 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; + } + + return 0; +} + +/* Wrapper of ppc64_skip_trampoline_code_1 checking also + ppc_elfv2_skip_entrypoint. */ + +CORE_ADDR +ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) +{ + struct gdbarch *gdbarch = get_frame_arch (frame); - 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; + pc = ppc64_skip_trampoline_code_1 (frame, pc); + if (pc != 0 && gdbarch_skip_entrypoint_p (gdbarch)) + pc = gdbarch_skip_entrypoint (gdbarch, pc); + return pc; } /* Support for convert_from_func_ptr_addr (ARCH, ADDR, TARG) on PPC64