[S390] add breaking event address for user space
Copy the last breaking event address from the lowcore to a new
field in the thread_struct on each system entry. Add a new
ptrace request PTRACE_GET_LAST_BREAK and a new utrace regset
REGSET_LAST_BREAK to query the last breaking event.
This is useful for debugging wild branches in user space code.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/include/asm/ptrace.h b/arch/s390/include/asm/ptrace.h
index fef9b33..e2c218d 100644
--- a/arch/s390/include/asm/ptrace.h
+++ b/arch/s390/include/asm/ptrace.h
@@ -328,8 +328,8 @@
psw_t psw;
unsigned long gprs[NUM_GPRS];
unsigned long orig_gpr2;
- unsigned short svcnr;
unsigned short ilc;
+ unsigned short svcnr;
};
#endif
@@ -436,6 +436,7 @@
#define PTRACE_PEEKDATA_AREA 0x5003
#define PTRACE_POKETEXT_AREA 0x5004
#define PTRACE_POKEDATA_AREA 0x5005
+#define PTRACE_GET_LAST_BREAK 0x5006
/*
* PT_PROT definition is loosely based on hppa bsd definition in