[PATCH 03/11] perf annotate: Fix branch instruction with multiple operands

[Arnaldo Carvalho de Melo]

From: Kim Phillips <kim.phillips@xxxxxxx>

'perf annotate' is dropping the cr* fields from branch instructions.

Fix it by adding support to display branch instructions having
multiple operands.

Power Arch objdump of int_sqrt:

 20.36 | c0000000004d2694:   subf   r10,r10,r3
       | c0000000004d2698: v bgt    cr6,c0000000004d26a0 <int_sqrt+0x40>
  1.82 | c0000000004d269c:   mr     r3,r10
 29.18 | c0000000004d26a0:   mr     r10,r8
       | c0000000004d26a4: v bgt    cr7,c0000000004d26ac <int_sqrt+0x4c>
       | c0000000004d26a8:   mr     r10,r7

Power Arch Before Patch:

 20.36 |       subf   r10,r10,r3
       |     v bgt    40
  1.82 |       mr     r3,r10
 29.18 | 40:   mr     r10,r8
       |     v bgt    4c
       |       mr     r10,r7

Power Arch After patch:

 20.36 |       subf   r10,r10,r3
       |     v bgt    cr6,40
  1.82 |       mr     r3,r10
 29.18 | 40:   mr     r10,r8
       |     v bgt    cr7,4c
       |       mr     r10,r7

Also support AArch64 conditional branch instructions, which can
have up to three operands:

Aarch64 Non-simplified (raw objdump) view:

       âffff0000083cd11c: â cbz    w0, ffff0000083cd100 <security_filâ
...
  4.44 âffff000â083cd134: â tbnz   w0, #26, ffff0000083cd190 <securitâ
...
  1.37 âffff000â083cd144: â tbnz   w22, #5, ffff0000083cd1a4 <securitâ
       âffff000â083cd148:   mov    w19, #0x20000                   //â
  1.02 âffff000â083cd14c: â tbz    w22, #2, ffff0000083cd1ac <securitâ
...
  0.68 âffff000âââ3cd16c: â cbnz   w0, ffff0000083cd120 <security_filâ

Aarch64 Simplified, before this patch:

       â    â cbz    40
...
  4.44 â   ââ tbnz   w0, #26, ffff0000083cd190 <security_file_permissâ
...
  1.37 â   ââ tbnz   w22, #5, ffff0000083cd1a4 <security_file_permissâ
       â   â  mov    w19, #0x20000                   // #131072
  1.02 â   ââ tbz    w22, #2, ffff0000083cd1ac <security_file_permissâ
...
  0.68 â   âââcbnz   60

the cbz operand is missing, and the tbz doesn't get simplified processing
at all because the parsing function failed to match an address.

Aarch64 Simplified, After this patch applied:

       â    â cbz    w0, 40
...
  4.44 â   ââ tbnz   w0, #26, d0
...
  1.37 â   ââ tbnz   w22, #5, e4
       â   â  mov    w19, #0x20000                   // #131072
  1.02 â   ââ tbz    w22, #2, ec
...
  0.68 â   âââcbnz   w0, 60

Originally-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxxxxxxx>
Tested-by: Ravi Bangoria <ravi.bangoria@xxxxxxxxxxxxxxxxxx>
Reported-by: Anton Blanchard <anton@xxxxxxxxx>
Reported-by: Robin Murphy <robin.murphy@xxxxxxx>
Signed-off-by: Kim Phillips <kim.phillips@xxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Taeung Song <treeze.taeung@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20170601092959.f60d98912e8a1b66fd1e4c0e@xxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/util/annotate.c | 33 ++++++++++++++++++++++++++++++---
 1 file changed, 30 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 07d5608a675f..1367d7e35242 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -239,10 +239,20 @@ static int jump__parse(struct arch *arch __maybe_unused, struct ins_operands *op
 	const char *s = strchr(ops->raw, '+');
 	const char *c = strchr(ops->raw, ',');
 
-	if (c++ != NULL)
+	/*
+	 * skip over possible up to 2 operands to get to address, e.g.:
+	 * tbnz	 w0, #26, ffff0000083cd190 <security_file_permission+0xd0>
+	 */
+	if (c++ != NULL) {
 		ops->target.addr = strtoull(c, NULL, 16);
-	else
+		if (!ops->target.addr) {
+			c = strchr(c, ',');
+			if (c++ != NULL)
+				ops->target.addr = strtoull(c, NULL, 16);
+		}
+	} else {
 		ops->target.addr = strtoull(ops->raw, NULL, 16);
+	}
 
 	if (s++ != NULL) {
 		ops->target.offset = strtoull(s, NULL, 16);
@@ -257,10 +267,27 @@ static int jump__parse(struct arch *arch __maybe_unused, struct ins_operands *op
 static int jump__scnprintf(struct ins *ins, char *bf, size_t size,
 			   struct ins_operands *ops)
 {
+	const char *c = strchr(ops->raw, ',');
+
 	if (!ops->target.addr || ops->target.offset < 0)
 		return ins__raw_scnprintf(ins, bf, size, ops);
 
-	return scnprintf(bf, size, "%-6.6s %" PRIx64, ins->name, ops->target.offset);
+	if (c != NULL) {
+		const char *c2 = strchr(c + 1, ',');
+
+		/* check for 3-op insn */
+		if (c2 != NULL)
+			c = c2;
+		c++;
+
+		/* mirror arch objdump's space-after-comma style */
+		if (*c == ' ')
+			c++;
+	}
+
+	return scnprintf(bf, size, "%-6.6s %.*s%" PRIx64,
+			 ins->name, c ? c - ops->raw : 0, ops->raw,
+			 ops->target.offset);
 }
 
 static struct ins_ops jump_ops = {
-- 
2.9.4