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| author | Namhyung Kim <namhyung@kernel.org> | 2024-01-17 07:26:55 +0100 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2024-01-22 21:08:20 +0100 |
| commit | 6fed025f119d229cf345aed2207d2922ed71871d (patch) | |
| tree | 71971ec6f49d6e01c10190e3014305d5ecd557ff /tools/perf/util/dwarf-aux.h | |
| parent | perf annotate-data: Support global variables (diff) | |
| download | linux-6fed025f119d229cf345aed2207d2922ed71871d.tar.xz linux-6fed025f119d229cf345aed2207d2922ed71871d.zip | |
perf dwarf-aux: Add die_get_cfa()
The die_get_cfa() is to get frame base register and offset at the given
instruction address (pc). This info will be used to locate stack
variables which have location expression using DW_OP_fbreg.
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Link: https://lore.kernel.org/r/20240117062657.985479-8-namhyung@kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'tools/perf/util/dwarf-aux.h')
| -rw-r--r-- | tools/perf/util/dwarf-aux.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/tools/perf/util/dwarf-aux.h b/tools/perf/util/dwarf-aux.h index 4e64caac6df8..f209f9162908 100644 --- a/tools/perf/util/dwarf-aux.h +++ b/tools/perf/util/dwarf-aux.h @@ -177,4 +177,19 @@ static inline Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die __maybe_unu #endif /* HAVE_DWARF_GETLOCATIONS_SUPPORT */ +#ifdef HAVE_DWARF_CFI_SUPPORT + +/* Get the frame base information from CFA */ +int die_get_cfa(Dwarf *dwarf, u64 pc, int *preg, int *poffset); + +#else /* HAVE_DWARF_CFI_SUPPORT */ + +static inline int die_get_cfa(Dwarf *dwarf __maybe_unused, u64 pc __maybe_unused, + int *preg __maybe_unused, int *poffset __maybe_unused) +{ + return -1; +} + +#endif /* HAVE_DWARF_CFI_SUPPORT */ + #endif /* _DWARF_AUX_H */ |