Re: [PATCH v3 10/20] perf dwarf-regs: Move csky dwarf-regs out of arch

[Namhyung Kim]

On Wed, Oct 16, 2024 at 05:25:10PM -0700, Ian Rogers wrote:
> Move arch/csky/util/dwarf-regs.c to util/dwarf-regs-csky.c and compile
> in unconditionally. To avoid get_arch_regstr being duplicated, rename
> to get_csky_regstr and add to get_dwarf_regstr switch.
> 
> Update #ifdefs to allow ABI V1 and V2 tables at the same
> time. Determine the table from the ELF flags.
> 
> Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
> ---
>  tools/perf/arch/csky/util/Build               |  1 -
>  tools/perf/util/Build                         |  1 +
>  .../dwarf-regs.c => util/dwarf-regs-csky.c}   | 19 ++++++++++---------
>  tools/perf/util/dwarf-regs.c                  | 11 +++++++----
>  tools/perf/util/include/dwarf-regs.h          |  2 ++
>  5 files changed, 20 insertions(+), 14 deletions(-)
>  rename tools/perf/{arch/csky/util/dwarf-regs.c => util/dwarf-regs-csky.c} (74%)
> 
> diff --git a/tools/perf/arch/csky/util/Build b/tools/perf/arch/csky/util/Build
> index 1325310cab6a..5e6ea82c4202 100644
> --- a/tools/perf/arch/csky/util/Build
> +++ b/tools/perf/arch/csky/util/Build
> @@ -1,4 +1,3 @@
>  perf-util-y += perf_regs.o
>  
> -perf-util-$(CONFIG_LIBDW) += dwarf-regs.o
>  perf-util-$(CONFIG_LIBDW_DWARF_UNWIND) += unwind-libdw.o
> diff --git a/tools/perf/util/Build b/tools/perf/util/Build
> index 4c615611b9d7..99ae4e2802b8 100644
> --- a/tools/perf/util/Build
> +++ b/tools/perf/util/Build
> @@ -203,6 +203,7 @@ endif
>  perf-util-$(CONFIG_LIBDW) += probe-finder.o
>  perf-util-$(CONFIG_LIBDW) += dwarf-aux.o
>  perf-util-$(CONFIG_LIBDW) += dwarf-regs.o
> +perf-util-$(CONFIG_LIBDW) += dwarf-regs-csky.o
>  perf-util-$(CONFIG_LIBDW) += dwarf-regs-x86.o
>  perf-util-$(CONFIG_LIBDW) += debuginfo.o
>  perf-util-$(CONFIG_LIBDW) += annotate-data.o
> diff --git a/tools/perf/arch/csky/util/dwarf-regs.c b/tools/perf/util/dwarf-regs-csky.c
> similarity index 74%
> rename from tools/perf/arch/csky/util/dwarf-regs.c
> rename to tools/perf/util/dwarf-regs-csky.c
> index ca86ecaeacbb..d38ef1f07f3e 100644
> --- a/tools/perf/arch/csky/util/dwarf-regs.c
> +++ b/tools/perf/util/dwarf-regs-csky.c
> @@ -5,9 +5,8 @@
>  #include <stddef.h>
>  #include <dwarf-regs.h>
>  
> -#if defined(__CSKYABIV2__)
> -#define CSKY_MAX_REGS 73
> -const char *csky_dwarf_regs_table[CSKY_MAX_REGS] = {
> +#define CSKY_ABIV2_MAX_REGS 73
> +const char *csky_dwarf_regs_table_abiv2[CSKY_ABIV2_MAX_REGS] = {
>  	/* r0 ~ r8 */
>  	"%a0", "%a1", "%a2", "%a3", "%regs0", "%regs1", "%regs2", "%regs3",
>  	/* r9 ~ r15 */
> @@ -26,9 +25,9 @@ const char *csky_dwarf_regs_table[CSKY_MAX_REGS] = {
>  	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
>  	"%epc",
>  };
> -#else
> -#define CSKY_MAX_REGS 57
> -const char *csky_dwarf_regs_table[CSKY_MAX_REGS] = {
> +
> +#define CSKY_ABIV1_MAX_REGS 57
> +const char *csky_dwarf_regs_table_abiv1[CSKY_ABIV1_MAX_REGS] = {
>  	/* r0 ~ r8 */
>  	"%sp", "%regs9", "%a0", "%a1", "%a2", "%a3", "%regs0", "%regs1",
>  	/* r9 ~ r15 */
> @@ -41,9 +40,11 @@ const char *csky_dwarf_regs_table[CSKY_MAX_REGS] = {
>  	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
>  	"%epc",
>  };
> -#endif
>  
> -const char *get_arch_regstr(unsigned int n)
> +const char *get_csky_regstr(unsigned int n, unsigned int flags)
>  {
> -	return (n < CSKY_MAX_REGS) ? csky_dwarf_regs_table[n] : NULL;
> +	if (flags & EF_CSKY_ABIV2)

Hmm.. you need it here as well.


> +		return (n < CSKY_ABIV2_MAX_REGS) ? csky_dwarf_regs_table_abiv2[n] : NULL;
> +
> +	return (n < CSKY_ABIV1_MAX_REGS) ? csky_dwarf_regs_table_abiv1[n] : NULL;
>  }
> diff --git a/tools/perf/util/dwarf-regs.c b/tools/perf/util/dwarf-regs.c
> index fd21f9e90e40..9a76f83af62c 100644
> --- a/tools/perf/util/dwarf-regs.c
> +++ b/tools/perf/util/dwarf-regs.c
> @@ -29,17 +29,18 @@
>  #define __get_dwarf_regstr(tbl, n) (((n) < ARRAY_SIZE(tbl)) ? (tbl)[(n)] : NULL)
>  
>  /* Return architecture dependent register string (for kprobe-tracer) */
> -const char *get_dwarf_regstr(unsigned int n, unsigned int machine,
> -			     unsigned int flags __maybe_unused)
> +const char *get_dwarf_regstr(unsigned int n, unsigned int machine, unsigned int flags)
>  {
> -#if EM_HOST == EM_X86_64 || EM_HOST == EM_386 || EM_HOST == EM_AARCH64 || EM_HOST == EM_ARM
> +#if EM_HOST == EM_X86_64 || EM_HOST == EM_386 || EM_HOST == EM_AARCH64 || EM_HOST == EM_ARM \
> +    || EM_HOST == EM_CSKY

And here too.  It seems you also need a rebase.

At this point, I'm giving up.  Can you please refresh the series with
a fix?

Thanks,
Namhyung


>  	if (machine == EM_NONE) {
>  		/* Generic arch - use host arch */
>  		machine = EM_HOST;
>  	}
>  #endif
>  	switch (machine) {
> -#if EM_HOST != EM_X86_64 && EM_HOST != EM_386 && EM_HOST != EM_AARCH64 && EM_HOST != EM_ARM
> +#if EM_HOST != EM_X86_64 && EM_HOST != EM_386 && EM_HOST != EM_AARCH64 && EM_HOST != EM_ARM \
> +    && EM_HOST != EM_CSKY
>  	case EM_NONE:	/* Generic arch - use host arch */
>  		return get_arch_regstr(n);
>  #endif
> @@ -51,6 +52,8 @@ const char *get_dwarf_regstr(unsigned int n, unsigned int machine,
>  		return __get_dwarf_regstr(arm_regstr_tbl, n);
>  	case EM_AARCH64:
>  		return __get_dwarf_regstr(aarch64_regstr_tbl, n);
> +	case EM_CSKY:
> +		return get_csky_regstr(n, flags);
>  	case EM_SH:
>  		return __get_dwarf_regstr(sh_regstr_tbl, n);
>  	case EM_S390:
> diff --git a/tools/perf/util/include/dwarf-regs.h b/tools/perf/util/include/dwarf-regs.h
> index 0b533409d82a..b72d9d308ce4 100644
> --- a/tools/perf/util/include/dwarf-regs.h
> +++ b/tools/perf/util/include/dwarf-regs.h
> @@ -83,6 +83,8 @@
>  const char *get_arch_regstr(unsigned int n);
>  #endif
>  
> +const char *get_csky_regstr(unsigned int n, unsigned int flags);
> +
>  /**
>   * get_dwarf_regstr() - Returns ftrace register string from DWARF regnum.
>   * @n: DWARF register number.
> -- 
> 2.47.0.105.g07ac214952-goog
>