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[binutils-gdb] Epilogue unwinder for PowerPC.
- From: Wei-Cheng Wang <weicheng at sourceware dot org>
- To: gdb-cvs at sourceware dot org
- Date: 17 Jan 2015 13:26:07 -0000
- Subject: [binutils-gdb] Epilogue unwinder for PowerPC.
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2608dbf8a3ee666ac0a7d5d7c45611d489edcda5
commit 2608dbf8a3ee666ac0a7d5d7c45611d489edcda5
Author: Wei-cheng Wang <cole945@gmail.com>
Date: Sat Jan 17 14:29:16 2015 +0800
Epilogue unwinder for PowerPC.
Diff:
---
gdb/ChangeLog | 11 ++++++
gdb/rs6000-tdep.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++---
2 files changed, 107 insertions(+), 4 deletions(-)
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b95abdc..982e9ae 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,14 @@
+2015-01-17 Wei-cheng Wang <cole945@gmail.com>
+
+ * rs6000-tdep.c (rs6000_in_function_epilogue_p): Rename to
+ rs6000_in_function_epilogue_frame_p and add an argument
+ for frame_info.
+ (rs6000_epilogue_frame_cache, rs6000_epilogue_frame_this_id,
+ rs6000_epilogue_frame_prev_register, rs6000_epilogue_frame_sniffer):
+ New functions.
+ (rs6000_epilogue_frame_unwind): New.
+ (rs6000_gdbarch_init): Append epilogue unwinder.
+
2015-01-16 Sergio Durigan Junior <sergiodj@redhat.com>
* nat/linux-personality.c: Replace "#ifndef
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index 455318a..e6e2e60 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -872,14 +872,14 @@ insn_changes_sp_or_jumps (unsigned long insn)
limit for the size of an epilogue. */
static int
-rs6000_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+rs6000_in_function_epilogue_frame_p (struct frame_info *curfrm,
+ struct gdbarch *gdbarch, CORE_ADDR pc)
{
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
bfd_byte insn_buf[PPC_INSN_SIZE];
CORE_ADDR scan_pc, func_start, func_end, epilogue_start, epilogue_end;
unsigned long insn;
- struct frame_info *curfrm;
/* Find the search limits based on function boundaries and hard limit. */
@@ -892,8 +892,6 @@ rs6000_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
epilogue_end = pc + PPC_MAX_EPILOGUE_INSTRUCTIONS * PPC_INSN_SIZE;
if (epilogue_end > func_end) epilogue_end = func_end;
- curfrm = get_current_frame ();
-
/* Scan forward until next 'blr'. */
for (scan_pc = pc; scan_pc < epilogue_end; scan_pc += PPC_INSN_SIZE)
@@ -934,6 +932,15 @@ rs6000_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
return 0;
}
+/* Implementation of gdbarch_in_function_epilogue_p. */
+
+static int
+rs6000_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR pc)
+{
+ return rs6000_in_function_epilogue_frame_p (get_current_frame (),
+ gdbarch, pc);
+}
+
/* Get the ith function argument for the current function. */
static CORE_ADDR
rs6000_fetch_pointer_argument (struct frame_info *frame, int argi,
@@ -3339,6 +3346,89 @@ static const struct frame_unwind rs6000_frame_unwind =
NULL,
default_frame_sniffer
};
+
+static struct rs6000_frame_cache *
+rs6000_epilogue_frame_cache (struct frame_info *this_frame, void **this_cache)
+{
+ volatile struct gdb_exception ex;
+ struct rs6000_frame_cache *cache;
+ struct gdbarch *gdbarch = get_frame_arch (this_frame);
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+ CORE_ADDR sp;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = FRAME_OBSTACK_ZALLOC (struct rs6000_frame_cache);
+ (*this_cache) = cache;
+ cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
+
+ TRY_CATCH (ex, RETURN_MASK_ERROR)
+ {
+ /* At this point the stack looks as if we just entered the
+ function, and the return address is stored in LR. */
+ CORE_ADDR sp, lr;
+
+ sp = get_frame_register_unsigned (this_frame, gdbarch_sp_regnum (gdbarch));
+ lr = get_frame_register_unsigned (this_frame, tdep->ppc_lr_regnum);
+
+ cache->base = sp;
+ cache->initial_sp = sp;
+
+ trad_frame_set_value (cache->saved_regs,
+ gdbarch_pc_regnum (gdbarch), lr);
+ }
+ if (ex.reason < 0 && ex.error != NOT_AVAILABLE_ERROR)
+ throw_exception (ex);
+
+ return cache;
+}
+
+static void
+rs6000_epilogue_frame_this_id (struct frame_info *this_frame,
+ void **this_cache, struct frame_id *this_id)
+{
+ CORE_ADDR pc;
+ struct rs6000_frame_cache *info =
+ rs6000_epilogue_frame_cache (this_frame, this_cache);
+
+ pc = get_frame_func (this_frame);
+ if (info->base == 0)
+ (*this_id) = frame_id_build_unavailable_stack (pc);
+ else
+ (*this_id) = frame_id_build (info->base, pc);
+}
+
+static struct value *
+rs6000_epilogue_frame_prev_register (struct frame_info *this_frame,
+ void **this_cache, int regnum)
+{
+ struct rs6000_frame_cache *info =
+ rs6000_epilogue_frame_cache (this_frame, this_cache);
+ return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
+}
+
+static int
+rs6000_epilogue_frame_sniffer (const struct frame_unwind *self,
+ struct frame_info *this_frame,
+ void **this_prologue_cache)
+{
+ if (frame_relative_level (this_frame) == 0)
+ return rs6000_in_function_epilogue_frame_p (this_frame,
+ get_frame_arch (this_frame),
+ get_frame_pc (this_frame));
+ else
+ return 0;
+}
+
+static const struct frame_unwind rs6000_epilogue_frame_unwind =
+{
+ NORMAL_FRAME,
+ default_frame_unwind_stop_reason,
+ rs6000_epilogue_frame_this_id, rs6000_epilogue_frame_prev_register,
+ NULL,
+ rs6000_epilogue_frame_sniffer
+};
static CORE_ADDR
@@ -4154,6 +4244,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
case GDB_OSABI_NETBSD_ELF:
case GDB_OSABI_UNKNOWN:
set_gdbarch_unwind_pc (gdbarch, rs6000_unwind_pc);
+ frame_unwind_append_unwinder (gdbarch, &rs6000_epilogue_frame_unwind);
frame_unwind_append_unwinder (gdbarch, &rs6000_frame_unwind);
set_gdbarch_dummy_id (gdbarch, rs6000_dummy_id);
frame_base_append_sniffer (gdbarch, rs6000_frame_base_sniffer);
@@ -4162,6 +4253,7 @@ rs6000_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
set_gdbarch_believe_pcc_promotion (gdbarch, 1);
set_gdbarch_unwind_pc (gdbarch, rs6000_unwind_pc);
+ frame_unwind_append_unwinder (gdbarch, &rs6000_epilogue_frame_unwind);
frame_unwind_append_unwinder (gdbarch, &rs6000_frame_unwind);
set_gdbarch_dummy_id (gdbarch, rs6000_dummy_id);
frame_base_append_sniffer (gdbarch, rs6000_frame_base_sniffer);