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Use ARM-specific unwinding tables in unw_step

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Uses ex_tables routines to provide a new means of unwinding the stack.
Set UNW_ARM_UNWIND_METHOD=4 to use ARM-specific unwinding tables.

Signed-off-by: Ken Werner <ken.werner@linaro.org>
This commit is contained in:
Zachary T Welch 2011-03-15 18:15:43 +00:00 committed by Arun Sharma
parent ffc474b8c8
commit 6a67154674
3 changed files with 56 additions and 2 deletions
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1
include/tdep-arm/libunwind_i.h
View file

@ -261,6 +261,7 @@ extern int tdep_access_fpreg (struct cursor *c, unw_regnum_t reg,
#define UNW_ARM_METHOD_ALL 0xFF
#define UNW_ARM_METHOD_DWARF 0x01
#define UNW_ARM_METHOD_FRAME 0x02
#define UNW_ARM_METHOD_EXIDX 0x04
#define unwi_unwind_method UNW_OBJ(unwind_method)
extern int unwi_unwind_method;

17
src/arm/Ginit_local.c
View file

@ -1,5 +1,6 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2008 CodeSourcery
Copyright 2011 Linaro Limited
This file is part of libunwind.
@ -38,6 +39,7 @@ unw_init_local (unw_cursor_t *cursor, ucontext_t *uc)
PROTECTED int
unw_init_local (unw_cursor_t *cursor, ucontext_t *uc)
{
register void *current_sp asm ("sp");
struct cursor *c = (struct cursor *) cursor;
if (tdep_needs_initialization)
@ -47,6 +49,21 @@ unw_init_local (unw_cursor_t *cursor, ucontext_t *uc)
c->dwarf.as = unw_local_addr_space;
c->dwarf.as_arg = uc;
if (UNW_TRY_METHOD (UNW_ARM_METHOD_EXIDX))
{
int arm_exidx_init_done = 0;
if (!arm_exidx_init_done)
{
arm_exidx_init_done = 1;
arm_exidx_init_local ("libunwind");
}
c->frame.fp = __builtin_frame_address (0);
c->frame.sp = current_sp;
c->frame.lr = __builtin_return_address (0);
c->frame.pc = &unw_init_local;
}
return common_init (c, 1);
}

40
src/arm/Gstep.c
View file

@ -1,5 +1,6 @@
/* libunwind - a platform-independent unwind library
Copyright (C) 2008 CodeSourcery
Copyright 2011 Linaro Limited
This file is part of libunwind.
@ -24,6 +25,33 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include "unwind_i.h"
#include "offsets.h"
#include "ex_tables.h"
static inline int
arm_exidx_step (struct cursor *c)
{
struct arm_exidx_table *table = arm_exidx_table_find (c->frame.pc);
if (NULL == table)
return -UNW_ENOINFO;
struct arm_exidx_entry *entry = arm_exidx_table_lookup (table, c->frame.pc);
if (NULL == entry)
return -UNW_ENOINFO;
struct arm_exidx_vrs s;
arm_exidx_frame_to_vrs (&c->frame, &s);
uint8_t buf[32];
int ret = arm_exidx_extract (entry, buf);
if (ret < 0)
return ret;
ret = arm_exidx_decode (buf, ret, &arm_exidx_vrs_callback, &s);
if (ret < 0)
return -ret;
return arm_exidx_vrs_to_frame (&s, &c->frame);
}
PROTECTED int
unw_step (unw_cursor_t *cursor)
@ -33,8 +61,16 @@ unw_step (unw_cursor_t *cursor)
Debug (1, "(cursor=%p)\n", c);
/* Try DWARF-based unwinding... this is the only method likely to work for
ARM. */
if (UNW_TRY_METHOD (UNW_ARM_METHOD_EXIDX))
{
ret = arm_exidx_step (c);
if (ret >= 0)
return ret;
if (ret < 0 && ret != -UNW_ENOINFO)
return ret;
}
/* Next, try DWARF-based unwinding. */
if (UNW_TRY_METHOD(UNW_ARM_METHOD_DWARF))
{
ret = dwarf_step (&c->dwarf);