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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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60
gdb/ppc-linux-tdep.c
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@@ -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"
@@ -314,31 +315,50 @@ 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;
if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub, insnbuf))
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++)
{
/* Insn pattern is
lis r11, xxxx
lwz r11, xxxx(r11)
Branch target is in r11. */
if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub, insnbuf))
{
/* Insn pattern is
lis r11, xxxx
lwz r11, xxxx(r11)
Branch target is in r11. */
target = (ppc_insn_d_field (insnbuf[0]) << 16)
| ppc_insn_d_field (insnbuf[1]);
target = read_memory_unsigned_integer (target, 4, byte_order);
target = (ppc_insn_d_field (insnbuf[0]) << 16)
| ppc_insn_d_field (insnbuf[1]);
target = read_memory_unsigned_integer (target, 4, byte_order);
}
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)
+ 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;
}
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)
+ ppc_insn_d_field (insnbuf[0]);
target = read_memory_unsigned_integer (target, 4, byte_order);
}
return target;
return 0;
}
/* Wrappers to handle Linux-only registers. */