From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Sun, 24 Jul 2011 08:48:33 +0000 (+0200)
Subject: [S390] use siginfo for sigtrap signals
X-Git-Tag: v3.1-rc1~261^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=73b7d40ff1bcd44b4245c2714b88cf872fe44685;p=profile%2Fivi%2Fkernel-x86-ivi.git

[S390] use siginfo for sigtrap signals

Provide additional information on SIGTRAP by using a sig_info signal.
Use TRAP_BRKPT for breakpoints via illegal operation and TRAP_HWBKPT
for breakpoints via program event recording. Provide the address of
the instruction that caused the breakpoint via si_addr.
While we are at it get rid of tracehook_consider_fatal_signal.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index f386e16..e9372c7 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -18,7 +18,7 @@
 #include <linux/kernel.h>
 #include <linux/string.h>
 #include <linux/errno.h>
-#include <linux/tracehook.h>
+#include <linux/ptrace.h>
 #include <linux/timer.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
@@ -325,10 +325,17 @@ static inline void __user *get_psw_address(struct pt_regs *regs,
 
 void __kprobes do_per_trap(struct pt_regs *regs)
 {
+	siginfo_t info;
+
 	if (notify_die(DIE_SSTEP, "sstep", regs, 0, 0, SIGTRAP) == NOTIFY_STOP)
 		return;
-	if (current->ptrace)
-		force_sig(SIGTRAP, current);
+	if (!current->ptrace)
+		return;
+	info.si_signo = SIGTRAP;
+	info.si_errno = 0;
+	info.si_code = TRAP_HWBKPT;
+	info.si_addr = (void *) current->thread.per_event.address;
+	force_sig_info(SIGTRAP, &info, current);
 }
 
 static void default_trap_handler(struct pt_regs *regs, long pgm_int_code,
@@ -421,9 +428,13 @@ static void __kprobes illegal_op(struct pt_regs *regs, long pgm_int_code,
 		if (get_user(*((__u16 *) opcode), (__u16 __user *) location))
 			return;
 		if (*((__u16 *) opcode) == S390_BREAKPOINT_U16) {
-			if (current->ptrace)
-				force_sig(SIGTRAP, current);
-			else
+			if (current->ptrace) {
+				info.si_signo = SIGTRAP;
+				info.si_errno = 0;
+				info.si_code = TRAP_BRKPT;
+				info.si_addr = location;
+				force_sig_info(SIGTRAP, &info, current);
+			} else
 				signal = SIGILL;
 #ifdef CONFIG_MATHEMU
 		} else if (opcode[0] == 0xb3) {