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linux/tools/perf/arch/riscv
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Martin Kaiser 8d28a56cae perf riscv: fix register name strings 
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>
History 2026-06-10 16:54:41 -03:00
..
include perf riscv: fix register name strings 2026-06-10 16:54:41 -03:00
util perf riscv: Fix discarded const qualifier in _get_field() 2026-05-23 19:45:39 -03:00
Build perf util: Make util its own library 2024-06-26 11:07:42 -07:00
Makefile perf kvm stat: Remove use of the arch directory 2026-02-03 18:01:27 -03:00