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| author | Ian Rogers <irogers@google.com> | 2025-03-19 08:07:38 +0300 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2025-03-21 08:58:23 +0300 |
| commit | 95b802ca9def90a2147f2d9b884123a16ed7a507 (patch) | |
| tree | d45249e56a8d5deb0d599ec64b8e673e663e58e0 | |
| parent | 16ab5c708d9980464a0e034f6eccdece8cbe2dae (diff) | |
| download | linux-95b802ca9def90a2147f2d9b884123a16ed7a507.tar.xz | |
perf syscalltbl: Mask off ABI type for MIPS system calls
Arnd Bergmann described that MIPS system calls don't necessarily start
from 0 as an ABI prefix is applied:
https://lore.kernel.org/lkml/8ed7dfb2-1e4d-4aa4-a04b-0397a89365d1@app.fastmail.com/
When decoding the "id" (aka system call number) for MIPS ignore values
greater-than 1000.
Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Arnaldo Carvalho de Melo <acme@kernel.org>
Link: https://lore.kernel.org/r/20250319050741.269828-12-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
| -rw-r--r-- | tools/perf/util/syscalltbl.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/perf/util/syscalltbl.c b/tools/perf/util/syscalltbl.c index 4e6018e2e0b3..67a8ec10e9e4 100644 --- a/tools/perf/util/syscalltbl.c +++ b/tools/perf/util/syscalltbl.c @@ -46,6 +46,14 @@ const char *syscalltbl__name(int e_machine, int id) { const struct syscalltbl *table = find_table(e_machine); + if (e_machine == EM_MIPS && id > 1000) { + /* + * MIPS may encode the N32/64/O32 type in the high part of + * syscall number. Mask this off if present. See the values of + * __NR_N32_Linux, __NR_64_Linux, __NR_O32_Linux and __NR_Linux. + */ + id = id % 1000; + } if (table && id >= 0 && id < table->num_to_name_len) return table->num_to_name[id]; return NULL; |