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signals: demultiplexing SIGTRAP signal

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Currently a SIGTRAP can denote any one of below reasons.
	- Breakpoint hit
	- H/W debug register hit
	- Single step
	- Signal sent through kill() or rasie()

Architectures like powerpc/parisc provides infrastructure to demultiplex
SIGTRAP signal by passing down the information for receiving SIGTRAP through
si_code of siginfot_t structure. Here is an attempt is generalise this
infrastructure by extending it to x86 and x86_64 archs.

Signed-off-by: Srinivasa DS <srinivasa@in.ibm.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: akpm@linux-foundation.org
Cc: paulus@samba.org
Cc: linuxppc-dev@ozlabs.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Srinivasa Ds
2008-09-23 15:23:52 +05:30
committed by Ingo Molnar
parent 101d5b7137
commit da654b74bd
9 changed files with 21 additions and 21 deletions
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7
arch/x86/kernel/ptrace.c
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@@ -1358,7 +1358,8 @@ const struct user_regset_view *task_user_regset_view(struct task_struct *task)
#endif
}
void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
int error_code, int si_code)
{
struct siginfo info;
@@ -1367,7 +1368,7 @@ void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs, int error_code)
memset(&info, 0, sizeof(info));
info.si_signo = SIGTRAP;
info.si_code = TRAP_BRKPT;
info.si_code = si_code;
/* User-mode ip? */
info.si_addr = user_mode_vm(regs) ? (void __user *) regs->ip : NULL;
@@ -1454,5 +1455,5 @@ asmregparm void syscall_trace_leave(struct pt_regs *regs)
*/
if (test_thread_flag(TIF_SINGLESTEP) &&
tracehook_consider_fatal_signal(current, SIGTRAP, SIG_DFL))
send_sigtrap(current, regs, 0);
send_sigtrap(current, regs, 0, TRAP_BRKPT);
}