On Sat, 5 Oct 2024 12:55:26 -0700
Ian Rogers <irogers@xxxxxxxxxx> wrote:
> Rather than pass 0/EM_NONE, use the value computed in the disasm
> struct arch. Switch the EM_NONE case to EM_HOST, rewriting EM_NONE if
> it were passed to get_dwarf_regnum. Pass a flags value as
> architectures like csky need the flags to determine the ABI variant.
>
Does this change the command output when we use it for cross-build
environment? E.g. remote arch is different from host arch? If so,
please add output examples with/without this change.
Thank you,
> Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
> ---
> tools/perf/util/annotate.c | 6 +++---
> tools/perf/util/dwarf-regs.c | 8 ++++++--
> tools/perf/util/include/dwarf-regs.h | 5 +++--
> 3 files changed, 12 insertions(+), 7 deletions(-)
>
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index 37ce43c4eb8f..b1d98da79be8 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -2292,7 +2292,7 @@ static int extract_reg_offset(struct arch *arch, const char *str,
> if (regname == NULL)
> return -1;
>
> - op_loc->reg1 = get_dwarf_regnum(regname, 0);
> + op_loc->reg1 = get_dwarf_regnum(regname, arch->e_machine, arch->e_flags);
> free(regname);
>
> /* Get the second register */
> @@ -2305,7 +2305,7 @@ static int extract_reg_offset(struct arch *arch, const char *str,
> if (regname == NULL)
> return -1;
>
> - op_loc->reg2 = get_dwarf_regnum(regname, 0);
> + op_loc->reg2 = get_dwarf_regnum(regname, arch->e_machine, arch->e_flags);
> free(regname);
> }
> return 0;
> @@ -2405,7 +2405,7 @@ int annotate_get_insn_location(struct arch *arch, struct disasm_line *dl,
> return -1;
>
> if (*s == arch->objdump.register_char)
> - op_loc->reg1 = get_dwarf_regnum(s, 0);
> + op_loc->reg1 = get_dwarf_regnum(s, arch->e_machine, arch->e_flags);
> else if (*s == arch->objdump.imm_char) {
> op_loc->offset = strtol(s + 1, &p, 0);
> if (p && p != s + 1)
> diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
> index 7c01bc4d7e5b..1321387f6948 100644
> --- a/tools/perf/util/dwarf-regs.c
> +++ b/tools/perf/util/dwarf-regs.c
> @@ -70,7 +70,7 @@ __weak int get_arch_regnum(const char *name __maybe_unused)
> }
>
> /* Return DWARF register number from architecture register name */
> -int get_dwarf_regnum(const char *name, unsigned int machine)
> +int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags __maybe_unused)
> {
> char *regname = strdup(name);
> int reg = -1;
> @@ -84,8 +84,12 @@ int get_dwarf_regnum(const char *name, unsigned int machine)
> if (p)
> *p = '\0';
>
> + if (machine == EM_NONE) {
> + /* Generic arch - use host arch */
> + machine = EM_HOST;
> + }
> switch (machine) {
> - case EM_NONE: /* Generic arch - use host arch */
> + case EM_HOST:
> reg = get_arch_regnum(regname);
> break;
> default:
> diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
> index f4f87ded5e3d..ee0a734564c7 100644
> --- a/tools/perf/util/include/dwarf-regs.h
> +++ b/tools/perf/util/include/dwarf-regs.h
> @@ -93,12 +93,13 @@ int get_arch_regnum(const char *name);
> * name: architecture register name
> * machine: ELF machine signature (EM_*)
> */
> -int get_dwarf_regnum(const char *name, unsigned int machine);
> +int get_dwarf_regnum(const char *name, unsigned int machine, unsigned int flags);
>
> #else /* HAVE_LIBDW_SUPPORT */
>
> static inline int get_dwarf_regnum(const char *name __maybe_unused,
> - unsigned int machine __maybe_unused)
> + unsigned int machine __maybe_unused,
> + unsigned int flags __maybe_unused)
> {
> return -1;
> }
> --
> 2.47.0.rc0.187.ge670bccf7e-goog
>
--
Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>
