[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 (file)
--- 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) {