/* Copy the value of next pc of sigreturn and rt_sigrturn into PC,
return 1. In addition, set IS_THUMB depending on whether we
will return to ARM or Thumb code. Return 0 if it is not a
rt_sigreturn/sigreturn syscall. */
static int
arm_linux_sigreturn_return_addr (struct frame_info *frame,
unsigned long svc_number,
CORE_ADDR *pc, int *is_thumb)
{
/* Is this a sigreturn or rt_sigreturn syscall? */
if (svc_number == 119 || svc_number == 173)
{
if (get_frame_type (frame) == SIGTRAMP_FRAME)
{
ULONGEST t_bit = arm_psr_thumb_bit (frame_unwind_arch (frame));
CORE_ADDR cpsr
= frame_unwind_register_unsigned (frame, ARM_PS_REGNUM);
*is_thumb = (cpsr & t_bit) != 0;
*pc = frame_unwind_caller_pc (frame);
return 1;
}
}
return 0;
}
void
dwarf2_tailcall_sniffer_first (struct frame_info *this_frame,
void **tailcall_cachep,
const LONGEST *entry_cfa_sp_offsetp)
{
CORE_ADDR prev_pc = 0, prev_sp = 0; /* GCC warning. */
int prev_sp_p = 0;
CORE_ADDR this_pc;
struct gdbarch *prev_gdbarch;
struct call_site_chain *chain = NULL;
struct tailcall_cache *cache;
volatile struct gdb_exception except;
gdb_assert (*tailcall_cachep == NULL);
/* PC may be after the function if THIS_FRAME calls noreturn function,
get_frame_address_in_block will decrease it by 1 in such case. */
this_pc = get_frame_address_in_block (this_frame);
/* Catch any unwinding errors. */
TRY_CATCH (except, RETURN_MASK_ERROR)
{
int sp_regnum;
prev_gdbarch = frame_unwind_arch (this_frame);
/* Simulate frame_unwind_pc without setting this_frame->prev_pc.p. */
prev_pc = gdbarch_unwind_pc (prev_gdbarch, this_frame);
/* call_site_find_chain can throw an exception. */
chain = call_site_find_chain (prev_gdbarch, prev_pc, this_pc);
if (entry_cfa_sp_offsetp == NULL)
break;
sp_regnum = gdbarch_sp_regnum (prev_gdbarch);
if (sp_regnum == -1)
break;
prev_sp = frame_unwind_register_unsigned (this_frame, sp_regnum);
prev_sp_p = 1;
}
void
dwarf2_tailcall_sniffer_first (struct frame_info *this_frame,
void **tailcall_cachep,
const LONGEST *entry_cfa_sp_offsetp)
{
CORE_ADDR prev_pc = 0, prev_sp = 0; /* GCC warning. */
int prev_sp_p = 0;
CORE_ADDR this_pc;
struct gdbarch *prev_gdbarch;
struct call_site_chain *chain = NULL;
struct tailcall_cache *cache;
gdb_assert (*tailcall_cachep == NULL);
/* PC may be after the function if THIS_FRAME calls noreturn function,
get_frame_address_in_block will decrease it by 1 in such case. */
this_pc = get_frame_address_in_block (this_frame);
/* Catch any unwinding errors. */
TRY
{
int sp_regnum;
prev_gdbarch = frame_unwind_arch (this_frame);
/* Simulate frame_unwind_pc without setting this_frame->prev_pc.p. */
prev_pc = gdbarch_unwind_pc (prev_gdbarch, this_frame);
/* call_site_find_chain can throw an exception. */
chain = call_site_find_chain (prev_gdbarch, prev_pc, this_pc);
if (entry_cfa_sp_offsetp == NULL)
break;
sp_regnum = gdbarch_sp_regnum (prev_gdbarch);
if (sp_regnum == -1)
break;
prev_sp = frame_unwind_register_unsigned (this_frame, sp_regnum);
prev_sp_p = 1;
}
CATCH (except, RETURN_MASK_ERROR)
{
if (entry_values_debug)
exception_print (gdb_stdout, except);
return;
}
END_CATCH
/* Ambiguous unwind or unambiguous unwind verified as matching. */
if (chain == NULL || chain->length == 0)
{
xfree (chain);
return;
}
cache = cache_new_ref1 (this_frame);
*tailcall_cachep = cache;
cache->chain = chain;
cache->prev_pc = prev_pc;
cache->chain_levels = pretended_chain_levels (chain);
cache->prev_sp_p = prev_sp_p;
if (cache->prev_sp_p)
{
cache->prev_sp = prev_sp;
cache->entry_cfa_sp_offset = *entry_cfa_sp_offsetp;
}
gdb_assert (cache->chain_levels > 0);
}
