From 0b58a77ca8792bd7798ef3a4d865c57694ec74fc Mon Sep 17 00:00:00 2001 From: Thomas Richter Date: Wed, 7 Mar 2018 14:43:25 +0100 Subject: [PATCH] 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 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 Cc: Heiko Carstens Cc: Hendrik Brueckner Cc: Martin Schwidefsky Link: http://lkml.kernel.org/r/20180307134325.96106-1-tmricht@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/arch/s390/annotate/instructions.c | 53 +++++++++++++++++++- tools/perf/util/annotate.c | 2 +- 2 files changed, 53 insertions(+), 2 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 +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; diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c index 49ff825f745c..bc3302da702b 100644 --- a/tools/perf/util/annotate.c +++ b/tools/perf/util/annotate.c @@ -248,7 +248,7 @@ static struct ins_ops call_ops = { bool ins__is_call(const struct ins *ins) { - return ins->ops == &call_ops; + return ins->ops == &call_ops || ins->ops == &s390_call_ops; } static int jump__parse(struct arch *arch __maybe_unused, struct ins_operands *ops, struct map *map __maybe_unused) -- 2.30.2