#include "defs.h"
#include "gdbcore.h"
#include "frame.h"
#include "target.h"
#define IS_SIGTRAMP(insn1, insn2) \
( \
(insn1 == 0xdefc0014 && insn2 == 0x70774e40) \
\
|| insn1 == 0x70774e40)
#define IS_RT_SIGTRAMP(insn1, insn2) \
( \
(insn1 == 0x203c0000 && insn2 == 0x00ad4e40) \
\
|| (insn1 == 0x70524600 && (insn2 >> 16) == 0x4e40))
int
m68k_linux_in_sigtramp (CORE_ADDR pc)
{
CORE_ADDR sp;
char buf[12];
unsigned long insn0, insn1, insn2;
if (read_memory_nobpt (pc - 4, buf, sizeof (buf)))
return 0;
insn1 = extract_unsigned_integer (buf + 4, 4);
insn2 = extract_unsigned_integer (buf + 8, 4);
if (IS_SIGTRAMP (insn1, insn2))
return 1;
if (IS_RT_SIGTRAMP (insn1, insn2))
return 2;
insn0 = extract_unsigned_integer (buf, 4);
if (IS_SIGTRAMP (insn0, insn1))
return 1;
if (IS_RT_SIGTRAMP (insn0, insn1))
return 2;
insn0 = (insn0 << 16) | (insn1 >> 16);
insn1 = (insn1 << 16) | (insn2 >> 16);
if (IS_SIGTRAMP (insn0, insn1))
return 1;
if (IS_RT_SIGTRAMP (insn0, insn1))
return 2;
return 0;
}
#define SIGCONTEXT_PC_OFFSET 26
#define UCONTEXT_PC_OFFSET 88
static CORE_ADDR
m68k_linux_sigtramp_saved_pc (struct frame_info *frame)
{
CORE_ADDR sigcontext_addr;
char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
int ptrbytes = TARGET_PTR_BIT / TARGET_CHAR_BIT;
int sigcontext_offs = (2 * TARGET_INT_BIT) / TARGET_CHAR_BIT;
if (frame->next)
sigcontext_addr
= read_memory_unsigned_integer (FRAME_ARGS_ADDRESS (frame->next)
+ FRAME_ARGS_SKIP
+ sigcontext_offs,
ptrbytes);
else
sigcontext_addr
= read_memory_unsigned_integer (read_register (SP_REGNUM)
+ sigcontext_offs,
ptrbytes);
if (m68k_linux_in_sigtramp (frame->pc) == 2)
target_read_memory (sigcontext_addr + UCONTEXT_PC_OFFSET, buf, ptrbytes);
else
target_read_memory (sigcontext_addr + SIGCONTEXT_PC_OFFSET, buf, ptrbytes);
return extract_unsigned_integer (buf, ptrbytes);
}
CORE_ADDR
m68k_linux_frame_saved_pc (struct frame_info *frame)
{
if (get_frame_type (frame) == SIGTRAMP_FRAME)
return m68k_linux_sigtramp_saved_pc (frame);
return read_memory_unsigned_integer (frame->frame + 4, 4);
}