Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1466376 > unrolled thread

[PATCH v6 4/7] perf annotate: Do not ignore call instruction with indirect target

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  [PATCH v6 4/7] perf annotate: Do not ignore call instruction with indirect target Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> - 2016-08-19 15:10 +0200

#1466376 — [PATCH v6 4/7] perf annotate: Do not ignore call instruction with indirect target

Do not ignore call instruction with indirect target when its already
identified as a call. This is an extension of commit e8ea1561952b
("perf annotate: Use raw form for register indirect call instructions")
to generalize annotation for all instructions with indirect calls.

This is needed for certain powerpc call instructions that use address
in a register (such as bctrl, btarl, ...).

Apart from that, when kcore is used to disassemble function, all call
instructions were ignored. This patch will fix it as a side effect by
not ignoring them. For example,

Before (with kcore):
       mov    %r13,%rdi
       callq  0xffffffff811a7e70
     ^ jmpq   64
       mov    %gs:0x7ef41a6e(%rip),%al

After (with kcore):
       mov    %r13,%rdi
     > callq  0xffffffff811a7e70
     ^ jmpq   64
       mov    %gs:0x7ef41a6e(%rip),%al

Suggested-by: Michael Ellerman <mpe@ellerman.id.au>
[Suggested about 'bctrl' instruction]
Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
---
Changes in v6:
  - No change

 tools/perf/util/annotate.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index ea07588..a05423b 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -81,16 +81,12 @@ static int call__parse(struct ins_operands *ops, const char *norm_arch)
 	return ops->target.name == NULL ? -1 : 0;
 
 indirect_call:
-	tok = strchr(endptr, '(');
-	if (tok != NULL) {
+	tok = strchr(endptr, '*');
+	if (tok == NULL) {
 		ops->target.addr = 0;
 		return 0;
 	}
 
-	tok = strchr(endptr, '*');
-	if (tok == NULL)
-		return -1;
-
 	ops->target.addr = strtoull(tok + 1, NULL, 16);
 	return 0;
 }
-- 
2.5.5

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web