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authorThomas Richter <tmricht@linux.vnet.ibm.com>2018-03-07 14:43:25 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-03-08 10:05:59 -0300
commit0b58a77ca8792bd7798ef3a4d865c57694ec74fc (patch)
treefaa7ddd42644f4b47ff3ae4dfd700610fbe29130 /tools/perf/arch
parent599a5beb78ad95181677e7919f54dbd64b404cf7 (diff)
downloadlinux-0b58a77ca8792bd7798ef3a4d865c57694ec74fc.tar.bz2
perf annotate: Fix s390 target function disassembly
'perf annotate' displays function call assembler instructions with a right arrow. Hitting enter on this line/instruction causes the browser to disassemble this target function and show it on the screen. On s390 this results in an error message 'The called function was not found.' The function call assembly line parsing does not handle the s390 bras and brasl instructions. Function call__parse expects the target as first operand: callq e9140 <__fxstat> S390 has a register number as first operand: brasl %r14,41d60 <abort> Therefore the target addresses on s390 are always zero which is an invalid address. Introduce a s390 specific call parsing function which skips the first operand on s390. Signed-off-by: Thomas Richter <tmricht@linux.vnet.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Link: http://lkml.kernel.org/r/20180307134325.96106-1-tmricht@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/arch')
-rw-r--r--tools/perf/arch/s390/annotate/instructions.c53
1 files changed, 52 insertions, 1 deletions
diff --git a/tools/perf/arch/s390/annotate/instructions.c b/tools/perf/arch/s390/annotate/instructions.c
index 01df9d8303e1..e80589fc5b58 100644
--- a/tools/perf/arch/s390/annotate/instructions.c
+++ b/tools/perf/arch/s390/annotate/instructions.c
@@ -1,6 +1,57 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/compiler.h>
+static int s390_call__parse(struct arch *arch, struct ins_operands *ops,
+ struct map *map)
+{
+ char *endptr, *tok, *name;
+ struct addr_map_symbol target = {
+ .map = map,
+ };
+
+ tok = strchr(ops->raw, ',');
+ if (!tok)
+ return -1;
+
+ ops->target.addr = strtoull(tok + 1, &endptr, 16);
+
+ name = strchr(endptr, '<');
+ if (name == NULL)
+ return -1;
+
+ name++;
+
+ if (arch->objdump.skip_functions_char &&
+ strchr(name, arch->objdump.skip_functions_char))
+ return -1;
+
+ tok = strchr(name, '>');
+ if (tok == NULL)
+ return -1;
+
+ *tok = '\0';
+ ops->target.name = strdup(name);
+ *tok = '>';
+
+ if (ops->target.name == NULL)
+ return -1;
+ target.addr = map__objdump_2mem(map, ops->target.addr);
+
+ if (map_groups__find_ams(&target) == 0 &&
+ map__rip_2objdump(target.map, map->map_ip(target.map, target.addr)) == ops->target.addr)
+ ops->target.sym = target.sym;
+
+ return 0;
+}
+
+static int call__scnprintf(struct ins *ins, char *bf, size_t size,
+ struct ins_operands *ops);
+
+static struct ins_ops s390_call_ops = {
+ .parse = s390_call__parse,
+ .scnprintf = call__scnprintf,
+};
+
static struct ins_ops *s390__associate_ins_ops(struct arch *arch, const char *name)
{
struct ins_ops *ops = NULL;
@@ -14,7 +65,7 @@ static struct ins_ops *s390__associate_ins_ops(struct arch *arch, const char *na
if (!strcmp(name, "bras") ||
!strcmp(name, "brasl") ||
!strcmp(name, "basr"))
- ops = &call_ops;
+ ops = &s390_call_ops;
if (!strcmp(name, "br"))
ops = &ret_ops;