perf trace beauty: Beautify arch_prctl()'s arguments
This actually so far, AFAIK is available only in x86, so the code was put in place with x86 prefixes, in arches where it is not available it will just not be called, so no further mechanisms are needed at this time. Later, when other arches wire this up, we'll just look at the uname (live sessions) or perf_env data in the perf.data header to auto-wire the right beautifier. With this the output is the same as produced by 'strace' when used with the following ~/.perfconfig: # cat ~/.perfconfig [llvm] dump-obj = true [trace] add_events = /home/acme/git/perf/tools/perf/examples/bpf/augmented_raw_syscalls.o show_zeros = yes show_duration = no no_inherit = yes show_timestamp = no show_arg_names = no args_alignment = -40 show_prefix = yes # And, on fedora 29, since the string tables are generated from the kernel sources, we don't know about 0x3001, just like strace: --- /tmp/strace 2018-12-17 11:22:08.707586721 -0300 +++ /tmp/trace 2018-12-18 11:11:32.037512729 -0300 @@ -1,49 +1,49 @@ -arch_prctl(0x3001 /* ARCH_??? */, 0x7ffc8a92dc80) = -1 EINVAL (Invalid argument) +arch_prctl(0x3001 /* ARCH_??? */, 0x7ffe4eb93ae0) = -1 EINVAL (Invalid argument) -arch_prctl(ARCH_SET_FS, 0x7faf6700f540) = 0 +arch_prctl(ARCH_SET_FS, 0x7fb507364540) = 0 And that seems to be related to the CET/Shadow Stack feature, that userland in Fedora 29 (glibc 2.28) are querying the kernel about, that 0x3001 seems to be ARCH_CET_STATUS, I'll check the situation and test with a fedora 29 kernel to see if the other codes are used. A diff that ignores the different pointers for different runs needs to be put in place in the upcoming regression tests comparing 'perf trace's output to strace's. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-73a9prs8ktkrt97trtdmdjs8@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -664,6 +664,9 @@ static struct syscall_fmt {
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} syscall_fmts[] = {
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{ .name = "access",
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.arg = { [1] = { .scnprintf = SCA_ACCMODE, /* mode */ }, }, },
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{ .name = "arch_prctl",
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.arg = { [0] = { .scnprintf = SCA_X86_ARCH_PRCTL_CODE, /* code */ },
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[1] = { .scnprintf = SCA_PTR, /* arg2 */ }, }, },
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{ .name = "bind",
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.arg = { [1] = { .scnprintf = SCA_SOCKADDR, /* umyaddr */ }, }, },
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{ .name = "bpf",
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@ -793,7 +796,7 @@ static struct syscall_fmt {
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[3] = { .scnprintf = SCA_INT, /* pkey */ }, }, },
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{ .name = "poll", .timeout = true, },
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{ .name = "ppoll", .timeout = true, },
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{ .name = "prctl", .alias = "arch_prctl",
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{ .name = "prctl",
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.arg = { [0] = { .scnprintf = SCA_PRCTL_OPTION, /* option */ },
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[1] = { .scnprintf = SCA_PRCTL_ARG2, /* arg2 */ },
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[2] = { .scnprintf = SCA_PRCTL_ARG3, /* arg3 */ }, }, },
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@ -7,6 +7,7 @@ endif
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libperf-y += kcmp.o
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libperf-y += mount_flags.o
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libperf-y += pkey_alloc.o
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libperf-y += arch_prctl.o
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libperf-y += prctl.o
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libperf-y += renameat.o
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libperf-y += sockaddr.o
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33
tools/perf/trace/beauty/arch_prctl.c
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33
tools/perf/trace/beauty/arch_prctl.c
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@ -0,0 +1,33 @@
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// SPDX-License-Identifier: LGPL-2.1
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/*
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* trace/beauty/arch_prctl.c
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*
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* Copyright (C) 2018, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
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*/
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#include "trace/beauty/beauty.h"
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#include <linux/kernel.h>
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#include "trace/beauty/generated/x86_arch_prctl_code_array.c"
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static DEFINE_STRARRAY_OFFSET(x86_arch_prctl_codes_1, "ARCH_", x86_arch_prctl_codes_1_offset);
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static DEFINE_STRARRAY_OFFSET(x86_arch_prctl_codes_2, "ARCH_", x86_arch_prctl_codes_2_offset);
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static struct strarray *x86_arch_prctl_codes[] = {
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&strarray__x86_arch_prctl_codes_1,
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&strarray__x86_arch_prctl_codes_2,
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};
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static DEFINE_STRARRAYS(x86_arch_prctl_codes);
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static size_t x86_arch_prctl__scnprintf_code(int option, char *bf, size_t size, bool show_prefix)
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{
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return strarrays__scnprintf(&strarrays__x86_arch_prctl_codes, bf, size, "%#x", show_prefix, option);
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}
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size_t syscall_arg__scnprintf_x86_arch_prctl_code(char *bf, size_t size, struct syscall_arg *arg)
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{
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unsigned long code = arg->val;
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return x86_arch_prctl__scnprintf_code(code, bf, size, arg->show_string_prefix);
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}
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@ -155,6 +155,9 @@ size_t syscall_arg__scnprintf_pkey_alloc_access_rights(char *bf, size_t size, st
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size_t syscall_arg__scnprintf_open_flags(char *bf, size_t size, struct syscall_arg *arg);
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#define SCA_OPEN_FLAGS syscall_arg__scnprintf_open_flags
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size_t syscall_arg__scnprintf_x86_arch_prctl_code(char *bf, size_t size, struct syscall_arg *arg);
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#define SCA_X86_ARCH_PRCTL_CODE syscall_arg__scnprintf_x86_arch_prctl_code
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size_t syscall_arg__scnprintf_prctl_option(char *bf, size_t size, struct syscall_arg *arg);
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#define SCA_PRCTL_OPTION syscall_arg__scnprintf_prctl_option
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