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perf syscalltbl: Mask off ABI type for MIPS system calls

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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>
This commit is contained in:
Ian Rogers 2025-03-18 22:07:38 -07:00 committed by Namhyung Kim
parent 16ab5c708d
commit 95b802ca9d
1 changed files with 8 additions and 0 deletions
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8
tools/perf/util/syscalltbl.c
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@ -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;