[S390] disassembler: mark exception causing instructions
If an exception happens the PSW either points to the instruction that
caused the exception or to the instruction that follows the exception
causing instruction, depending on the exception type.
Since the inkernel disassembler adds a ">" in front of the disassembly
many people assume incorrectly that the instruction that is pointed to
must be the cause of the exception. To make people aware that this is
not necessarily the case add a different character in front of the
disassembled instruction that precedes the current instructions.
The output now looks like this:
Krnl PSW : 0704200180000000 0000000000120de8 (test_function+0x0/0x100)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:2 PM:0 EA:3
Krnl GPRS: 000003ff00000000 0000000000120de4 000000000091bb40 0000000000000001
000003fffd2ea000 0000000030fb7df8 0000000030fb7f10 000003ffffa113c8
000000000091bb40 000003fffd2ea000 0000000000000002 0000000030fb7f10
000000003f290240 0000000000606220 00000000002cfb5c 0000000030fb7d58
Krnl Code: 0000000000120ddc: b90400a9 lgr %r10,%r9
0000000000120de0: a7f4ff88 brc 15,120cf0
#0000000000120de4: a7f40001 brc 15,120de6
>0000000000120de8: a7f13f80 tmll %r15,16256
0000000000120dec: eb8ff0580024 stmg %r8,%r15,88(%r15)
0000000000120df2: a7840001 brc 8,120df4
0000000000120df6: b90400ef lgr %r14,%r15
0000000000120dfa: a7fbffb8 aghi %r15,-72
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/dis.c b/arch/s390/kernel/dis.c
index 45df6d4..e2f8475 100644
--- a/arch/s390/kernel/dis.c
+++ b/arch/s390/kernel/dis.c
@@ -1578,10 +1578,15 @@
ptr += sprintf(ptr, "%s Code:", mode);
hops = 0;
while (start < end && hops < 8) {
- *ptr++ = (start == 32) ? '>' : ' ';
+ opsize = insn_length(code[start]);
+ if (start + opsize == 32)
+ *ptr++ = '#';
+ else if (start == 32)
+ *ptr++ = '>';
+ else
+ *ptr++ = ' ';
addr = regs->psw.addr + start - 32;
ptr += sprintf(ptr, ONELONG, addr);
- opsize = insn_length(code[start]);
if (start + opsize >= end)
break;
for (i = 0; i < opsize; i++)