github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-27 01:32:21 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

perf riscv: fix register name strings

Browse Source 
On risc-v, pref probe generates an invalid syntax for a named register in
a kprobe.

$ perf probe --debug verbose --add "n_tty_write tty"
...
Writing event: p:probe/n_tty_write _text+8922528 tty=%"%a0":x64
Failed to write event: Invalid argument

The problem is the combination of

   #define REG_DWARFNUM_NAME(reg, idx) [idx] = "%" #reg

and entries such as

   REG_DWARFNUM_NAME("%a0", 10)

where #reg will escape the quotes of the first macro parameter.

Update the macro definition to produce the correct syntax for a named
register in a kprobe, i.e. the unquoted register name with only one
leading %.

Fixes: a90c451918 ("perf riscv: Remove dwarf-regs.c and add dwarf-regs-table.h")
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Cc: Ian Rogers <irogers@google.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Martin Kaiser 2026-06-09 10:13:09 +02:00 committed by Arnaldo Carvalho de Melo
parent d5312a7ef7
commit 8d28a56cae
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/arch/riscv/include/dwarf-regs-table.h
View File

@ -3,7 +3,7 @@
/* This is included in perf/util/dwarf-regs.c */
#undef REG_DWARFNUM_NAME
#define REG_DWARFNUM_NAME(reg, idx) [idx] = "%" #reg
#define REG_DWARFNUM_NAME(reg, idx) [idx] = reg
static const char * const riscv_regstr_tbl[] = {
REG_DWARFNUM_NAME("%zero", 0),