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Re: [PATCH 3/3 v2] Process record support for PowerPC
- From: Wei-cheng Wang <cole945 at gmail dot com>
- To: uweigand at de dot ibm dot com, gdb-patches at sourceware dot org
- Date: Sun, 07 Dec 2014 02:00:48 +0800
- Subject: Re: [PATCH 3/3 v2] Process record support for PowerPC
- Authentication-results: sourceware.org; auth=none
2014-12-06 Wei-cheng Wang <cole945@gmail.com>
* ppc-linux-tdep.c (powerpc_linux_in_dynsym_resolve_code):
Scan PLT stub backward for reverse debugging.
(ppc_linux_init_abi): set powerpc_linux_in_dynsym_resolve_code
for both 32-bit and 64-bit.
---
gdb/ppc-linux-tdep.c | 35 ++++++++++++++++++++++++++---------
1 file changed, 26 insertions(+), 9 deletions(-)
diff --git a/gdb/ppc-linux-tdep.c b/gdb/ppc-linux-tdep.c
index 0a2afa7..f8971a3 100644
--- a/gdb/ppc-linux-tdep.c
+++ b/gdb/ppc-linux-tdep.c
@@ -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"
@@ -300,6 +301,22 @@ powerpc_linux_in_dynsym_resolve_code (CORE_ADDR pc)
|| strcmp (MSYMBOL_LINKAGE_NAME (sym.minsym),
"__glink_PLTresolve") == 0))
return 1;
+ else if (execution_direction == EXEC_REVERSE)
+ {
+ int i;
+ struct frame_info *frame = get_current_frame ();
+ struct gdbarch *gdbarch = get_frame_arch (frame);
+ const int plt_stub_len = 4;
+
+ /* Scan backward to chech whether we are in the middle
+ of PLT stub. */
+ for (i = 0; i < plt_stub_len; i++)
+ {
+ if (gdbarch_skip_trampoline_code (gdbarch, frame, pc))
+ return 1;
+ pc -= 4;
+ }
+ }
return 0;
}
@@ -1698,15 +1715,6 @@ ppc_linux_init_abi (struct gdbarch_info info,
else
set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc");
- if (powerpc_so_ops.in_dynsym_resolve_code == NULL)
- {
- powerpc_so_ops = svr4_so_ops;
- /* Override dynamic resolve function. */
- powerpc_so_ops.in_dynsym_resolve_code =
- powerpc_linux_in_dynsym_resolve_code;
- }
- set_solib_ops (gdbarch, &powerpc_so_ops);
-
set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
}
@@ -1751,6 +1759,15 @@ ppc_linux_init_abi (struct gdbarch_info info,
set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc");
}
+ if (powerpc_so_ops.in_dynsym_resolve_code == NULL)
+ {
+ powerpc_so_ops = svr4_so_ops;
+ /* Override dynamic resolve function. */
+ powerpc_so_ops.in_dynsym_resolve_code =
+ powerpc_linux_in_dynsym_resolve_code;
+ }
+ set_solib_ops (gdbarch, &powerpc_so_ops);
+
/* PPC32 uses a different prpsinfo32 compared to most other Linux
archs. */
if (tdep->wordsize == 4)
--
1.9.1