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* config/m68k/tm-linux.h (FRAME_SAVED_PC): Define as

Browse source 
m68k_linux_frame_saved_pc.
	(IN_SIGTRAMP): Define as m68k_linux_in_sigtramp instead of
	in_sigtramp.
	(SIGCONTEXT_PC_OFFSET): Remove.
	* m68klinux-nat.c (m68k_linux_frame_saved_pc,
	m68k_linux_sigtramp_saved_pc): New functions.
	(IS_SIGTRAMP, IS_RT_SIGTRAMP): Define.
	(SIGCONTEXT_PC_OFFSET): Moved here from config/m68k/tm-linux.h.
	(UCONTEXT_PC_OFFSET): Define.
	(m68k_linux_in_sigtramp): Renamed from in_sigtramp, handle both
	non-RT and RT signal trampolines.
This commit is contained in:
Andreas Schwab 2002-02-26 22:12:49 +00:00
parent 263de0103e
commit 75738c297b
3 changed files with 102 additions and 32 deletions
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15
gdb/ChangeLog
View file

@ -1,3 +1,18 @@
2002-02-26 Andreas Schwab <schwab@suse.de>
* config/m68k/tm-linux.h (FRAME_SAVED_PC): Define as
m68k_linux_frame_saved_pc.
(IN_SIGTRAMP): Define as m68k_linux_in_sigtramp instead of
in_sigtramp.
(SIGCONTEXT_PC_OFFSET): Remove.
* m68klinux-nat.c (m68k_linux_frame_saved_pc,
m68k_linux_sigtramp_saved_pc): New functions.
(IS_SIGTRAMP, IS_RT_SIGTRAMP): Define.
(SIGCONTEXT_PC_OFFSET): Moved here from config/m68k/tm-linux.h.
(UCONTEXT_PC_OFFSET): Define.
(m68k_linux_in_sigtramp): Renamed from in_sigtramp, handle both
non-RT and RT signal trampolines.
2002-02-26 Richard Earnshaw <rearnsha@arm.com>
* config/arm/tm-embed.h (TARGET_UPAGES): Delete.

15
gdb/config/m68k/tm-linux.h
View file

@ -99,16 +99,9 @@
#define GET_LONGJMP_TARGET(ADDR) m68k_get_longjmp_target(ADDR)
/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */
#define SIGCONTEXT_PC_OFFSET 26
#undef FRAME_SAVED_PC
#define FRAME_SAVED_PC(FRAME) \
(((FRAME)->signal_handler_caller \
? sigtramp_saved_pc (FRAME) \
: read_memory_integer ((FRAME)->frame + 4, 4)))
#define FRAME_SAVED_PC(frame) m68k_linux_frame_saved_pc (frame)
extern CORE_ADDR m68k_linux_frame_saved_pc (struct frame_info *);
extern CORE_ADDR sigtramp_saved_pc (struct frame_info *);
#define IN_SIGTRAMP(pc,name) in_sigtramp (pc)
extern int in_sigtramp (CORE_ADDR pc);
#define IN_SIGTRAMP(pc,name) m68k_linux_in_sigtramp (pc)
extern int m68k_linux_in_sigtramp (CORE_ADDR pc);

104
gdb/m68klinux-nat.c
View file

@ -594,40 +594,102 @@ kernel_u_size (void)
return (sizeof (struct user));
}
/* Return non-zero if PC points into the signal trampoline. */
/* Check whether insn1 and insn2 are parts of a signal trampoline. */
#define IS_SIGTRAMP(insn1, insn2) \
(/* addaw #20,sp; moveq #119,d0; trap #0 */ \
(insn1 == 0xdefc0014 && insn2 == 0x70774e40) \
/* moveq #119,d0; trap #0 */ \
|| insn1 == 0x70774e40)
#define IS_RT_SIGTRAMP(insn1, insn2) \
(/* movel #173,d0; trap #0 */ \
(insn1 == 0x203c0000 && insn2 == 0x00ad4e40) \
/* moveq #82,d0; notb d0; trap #0 */ \
|| (insn1 == 0x70524600 && (insn2 >> 16) == 0x4e40))
/* Return non-zero if PC points into the signal trampoline. For the sake
of m68k_linux_frame_saved_pc we also distinguish between non-RT and RT
signal trampolines. */
int
in_sigtramp (CORE_ADDR pc)
m68k_linux_in_sigtramp (CORE_ADDR pc)
{
CORE_ADDR sp;
char buf[TARGET_SHORT_BIT / TARGET_CHAR_BIT];
int insn;
char buf[12];
unsigned long insn0, insn1, insn2;
sp = read_register (SP_REGNUM);
if (pc - 2 < sp)
if (read_memory_nobpt (pc - 4, buf, sizeof (buf)))
return 0;
if (read_memory_nobpt (pc, buf, sizeof (buf)))
return 0;
insn = extract_unsigned_integer (buf, sizeof (buf));
if (insn == 0xdefc /* addaw #,sp */
|| insn == 0x7077 /* moveq #119,d0 */
|| insn == 0x4e40 /* trap #0 */
|| insn == 0x203c /* movel #,d0 */ )
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;
if (read_memory_nobpt (pc - 2, buf, sizeof (buf)))
return 0;
insn = extract_unsigned_integer (buf, sizeof (buf));
if (insn == 0xdefc /* addaw #,sp */
|| insn == 0x7077 /* moveq #119,d0 */
|| insn == 0x4e40 /* trap #0 */
|| insn == 0x203c /* movel #,d0 */ )
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;
}
/* Offset to saved PC in sigcontext, from <asm/sigcontext.h>. */
#define SIGCONTEXT_PC_OFFSET 26
/* Offset to saved PC in ucontext, from <asm/ucontext.h>. */
#define UCONTEXT_PC_OFFSET 88
/* Get saved user PC for sigtramp from sigcontext or ucontext. */
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;
/* Get sigcontext address, it is the third parameter on the stack. */
if (frame->next)
sigcontext_addr = read_memory_integer (FRAME_ARGS_ADDRESS (frame->next)
+ FRAME_ARGS_SKIP
+ sigcontext_offs,
ptrbytes);
else
sigcontext_addr = read_memory_integer (read_register (SP_REGNUM)
+ sigcontext_offs,
ptrbytes);
/* Don't cause a memory_error when accessing sigcontext in case the
stack layout has changed or the stack is corrupt. */
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);
}
/* Return the saved program counter for FRAME. */
CORE_ADDR
m68k_linux_frame_saved_pc (struct frame_info *frame)
{
if (frame->signal_handler_caller)
return m68k_linux_sigtramp_saved_pc (frame);
return read_memory_integer (frame->frame + 4, 4);
}
/* Register that we are able to handle GNU/Linux ELF core file
formats. */