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Skip-trampoline for PowerPC reverse-stepping.

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This commit is contained in:
Wei-cheng Wang
2015-01-17 14:30:59 +08:00
committed by Cole Wang
parent b4cdae6fe5
commit cf90fd9a07
3 changed files with 105 additions and 47 deletions
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6
gdb/ChangeLog
View File

@ -1,3 +1,9 @@
2015-01-17 Wei-cheng Wang <cole945@gmail.com>
* ppc-linux-tdep.c (ppc_skip_trampoline_code):
Scan PLT stub backward for reverse debugging.
* ppc64-tdep.c (ppc64_skip_trampoline_code): Likewise.
2015-01-17 Wei-cheng Wang <cole945@gmail.com>
Ulrich Weigand <uweigand@de.ibm.com>

26
gdb/ppc-linux-tdep.c
View File

@ -51,6 +51,7 @@
#include "linux-tdep.h"
#include "linux-record.h"
#include "record-full.h"
#include "infrun.h"
#include "stap-probe.h"
#include "ax.h"
@ -314,7 +315,16 @@ ppc_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
CORE_ADDR target = 0;
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 = 4; /* At more 4 instructions. */
for (i = 0; i < scan_limit; i++)
{
if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub, insnbuf))
{
/* Insn pattern is
@ -326,21 +336,31 @@ ppc_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
| ppc_insn_d_field (insnbuf[1]);
target = read_memory_unsigned_integer (target, 4, byte_order);
}
if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub_so, insnbuf))
else if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub_so,
insnbuf))
{
/* Insn pattern is
lwz r11, xxxx(r30)
Branch target is in r11. */
target = get_frame_register_unsigned (frame, tdep->ppc_gp0_regnum + 30)
target = get_frame_register_unsigned (frame,
tdep->ppc_gp0_regnum + 30)
+ ppc_insn_d_field (insnbuf[0]);
target = read_memory_unsigned_integer (target, 4, byte_order);
}
else
{
/* Scan backward one more instructions if doesn't match. */
pc -= 4;
continue;
}
return target;
}
return 0;
}
/* Wrappers to handle Linux-only registers. */
static void

50
gdb/ppc64-tdep.c
View File

@ -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"
@ -464,29 +465,57 @@ ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
ARRAY_SIZE (ppc64_standard_linkage8))))
- 1];
CORE_ADDR target;
int scan_limit, i;
if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage8, insns))
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 (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage7, 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 (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage6, 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 (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage5, 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 (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage4, 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 (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage3, 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 (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage2, 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 (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage1, 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
return 0;
{
/* 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
@ -495,6 +524,9 @@ ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
return target ? target : pc;
}
return 0;
}
/* Support for convert_from_func_ptr_addr (ARCH, ADDR, TARG) on PPC64
GNU/Linux.