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Message-Id: <200809221841.27993.srinivasa@in.ibm.com>
Date: Mon, 22 Sep 2008 18:41:27 +0530
From: Srinivasa Ds <srinivasa@...ibm.com>
To: Ingo Molnar <mingo@...e.hu>
Cc: Roland McGrath <roland@...hat.com>, linux-kernel@...r.kernel.org,
akpm@...ux-foundation.org, paulus@...ba.org,
linuxppc-dev@...abs.org, linux-parisc@...r.kernel.org,
"H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH] Demultiplexing SIGTRAP signal
On Monday 22 September 2008 16:12:02 Ingo Molnar wrote:
> no fundamental objections - assuming existing x86 apps have not grown an
> ABI dependency on the existing send_sigtrap() semantics. (Debuggers and
> JITs would be a candidate for such dependencies.)
>
Assuming that no ABI dependency exist between x86 apps and send_sigtrap(),
And implementing some of the Ingo's suggestions, Iam resending the patch.
Still waiting for Roland's reply.
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 strucutre. Here is an attempt is generalise this
infrasturcutre by extending it to x86 and x86_64 archs.
Signed-off-by: Srinivasa DS <srinivasa@...ibm.com>
---
arch/ia64/include/asm/siginfo.h | 5 -----
arch/powerpc/include/asm/siginfo.h | 5 -----
arch/x86/kernel/ptrace.c | 7 ++++---
arch/x86/kernel/traps_32.c | 4 +++-
arch/x86/kernel/traps_64.c | 2 +-
include/asm-generic/siginfo.h | 2 ++
include/asm-parisc/siginfo.h | 5 -----
include/asm-x86/ptrace.h | 2 +-
include/asm-x86/traps.h | 10 ++++++++++
9 files changed, 21 insertions(+), 21 deletions(-)
Index: linux-2.6.27-rc7/arch/ia64/include/asm/siginfo.h
===================================================================
--- linux-2.6.27-rc7.orig/arch/ia64/include/asm/siginfo.h
+++ linux-2.6.27-rc7/arch/ia64/include/asm/siginfo.h
@@ -113,11 +113,6 @@ typedef struct siginfo {
#undef NSIGSEGV
#define NSIGSEGV 3
-/*
- * SIGTRAP si_codes
- */
-#define TRAP_BRANCH (__SI_FAULT|3) /* process taken branch trap */
-#define TRAP_HWBKPT (__SI_FAULT|4) /* hardware breakpoint or watchpoint */
#undef NSIGTRAP
#define NSIGTRAP 4
Index: linux-2.6.27-rc7/arch/powerpc/include/asm/siginfo.h
===================================================================
--- linux-2.6.27-rc7.orig/arch/powerpc/include/asm/siginfo.h
+++ linux-2.6.27-rc7/arch/powerpc/include/asm/siginfo.h
@@ -15,11 +15,6 @@
#include <asm-generic/siginfo.h>
-/*
- * SIGTRAP si_codes
- */
-#define TRAP_BRANCH (__SI_FAULT|3) /* process taken branch trap */
-#define TRAP_HWBKPT (__SI_FAULT|4) /* hardware breakpoint or watchpoint */
#undef NSIGTRAP
#define NSIGTRAP 4
Index: linux-2.6.27-rc7/arch/x86/kernel/traps_32.c
===================================================================
--- linux-2.6.27-rc7.orig/arch/x86/kernel/traps_32.c
+++ linux-2.6.27-rc7/arch/x86/kernel/traps_32.c
@@ -891,6 +891,7 @@ void __kprobes do_debug(struct pt_regs *
{
struct task_struct *tsk = current;
unsigned int condition;
+ int si_code;
trace_hardirqs_fixup();
@@ -935,8 +936,9 @@ void __kprobes do_debug(struct pt_regs *
goto clear_TF_reenable;
}
+ si_code = get_si_code((unsigned long*)&condition);
/* Ok, finally something we can handle */
- send_sigtrap(tsk, regs, error_code);
+ send_sigtrap(tsk, regs, error_code, si_code);
/*
* Disable additional traps. They'll be re-enabled when
Index: linux-2.6.27-rc7/arch/x86/kernel/traps_64.c
===================================================================
--- linux-2.6.27-rc7.orig/arch/x86/kernel/traps_64.c
+++ linux-2.6.27-rc7/arch/x86/kernel/traps_64.c
@@ -936,7 +936,7 @@ asmlinkage void __kprobes do_debug(struc
tsk->thread.error_code = error_code;
info.si_signo = SIGTRAP;
info.si_errno = 0;
- info.si_code = TRAP_BRKPT;
+ info.si_code = get_si_code(&condition);
info.si_addr = user_mode(regs) ? (void __user *)regs->ip : NULL;
force_sig_info(SIGTRAP, &info, tsk);
Index: linux-2.6.27-rc7/include/asm-generic/siginfo.h
===================================================================
--- linux-2.6.27-rc7.orig/include/asm-generic/siginfo.h
+++ linux-2.6.27-rc7/include/asm-generic/siginfo.h
@@ -199,6 +199,8 @@ typedef struct siginfo {
*/
#define TRAP_BRKPT (__SI_FAULT|1) /* process breakpoint */
#define TRAP_TRACE (__SI_FAULT|2) /* process trace trap */
+#define TRAP_BRANCH (__SI_FAULT|3) /* process taken branch trap */
+#define TRAP_HWBKPT (__SI_FAULT|4) /* hardware breakpoint or watchpoint
*/
#define NSIGTRAP 2
/*
Index: linux-2.6.27-rc7/include/asm-parisc/siginfo.h
===================================================================
--- linux-2.6.27-rc7.orig/include/asm-parisc/siginfo.h
+++ linux-2.6.27-rc7/include/asm-parisc/siginfo.h
@@ -3,11 +3,6 @@
#include <asm-generic/siginfo.h>
-/*
- * SIGTRAP si_codes
- */
-#define TRAP_BRANCH (__SI_FAULT|3) /* process taken branch trap */
-#define TRAP_HWBKPT (__SI_FAULT|4) /* hardware breakpoint or watchpoint */
#undef NSIGTRAP
#define NSIGTRAP 4
Index: linux-2.6.27-rc7/arch/x86/kernel/ptrace.c
===================================================================
--- linux-2.6.27-rc7.orig/arch/x86/kernel/ptrace.c
+++ linux-2.6.27-rc7/arch/x86/kernel/ptrace.c
@@ -1357,7 +1357,8 @@ const struct user_regset_view *task_user
#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;
@@ -1366,7 +1367,7 @@ void send_sigtrap(struct task_struct *ts
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;
@@ -1476,5 +1477,5 @@ asmregparm void syscall_trace_leave(stru
*/
if (test_thread_flag(TIF_SINGLESTEP) &&
(current->ptrace & PT_PTRACED))
- send_sigtrap(current, regs, 0);
+ send_sigtrap(current, regs, 0, TRAP_BRKPT);
}
Index: linux-2.6.27-rc7/include/asm-x86/traps.h
===================================================================
--- linux-2.6.27-rc7.orig/include/asm-x86/traps.h
+++ linux-2.6.27-rc7/include/asm-x86/traps.h
@@ -36,6 +36,16 @@ void do_invalid_op(struct pt_regs *, lon
void do_general_protection(struct pt_regs *, long);
void do_nmi(struct pt_regs *, long);
+int get_si_code(unsigned long *condition)
+{
+ if (*condition & DR_STEP)
+ return TRAP_TRACE;
+ else if (*condition & (DR_TRAP0|DR_TRAP1|DR_TRAP2|DR_TRAP3))
+ return TRAP_HWBKPT;
+ else
+ return TRAP_BRKPT;
+}
+
extern int panic_on_unrecovered_nmi;
extern int kstack_depth_to_print;
Index: linux-2.6.27-rc7/include/asm-x86/ptrace.h
===================================================================
--- linux-2.6.27-rc7.orig/include/asm-x86/ptrace.h
+++ linux-2.6.27-rc7/include/asm-x86/ptrace.h
@@ -143,7 +143,7 @@ convert_ip_to_linear(struct task_struct
#ifdef CONFIG_X86_32
extern void send_sigtrap(struct task_struct *tsk, struct pt_regs *regs,
- int error_code);
+ int error_code, int si_code);
#else
void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
#endif
--
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