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Epilogue unwinder for PowerPC.

This commit is contained in:
Wei-cheng Wang 2015-01-17 14:29:16 +08:00 committed by Cole Wang
parent 07d57b544c
commit 2608dbf8a3
2 changed files with 107 additions and 4 deletions
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11
gdb/ChangeLog
View File

@ -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

100
gdb/rs6000-tdep.c
View File

@ -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);