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| author | Mahesh Bodapati <bmahi496@linux.ibm.com> | 2023-08-01 07:41:17 -0500 |
|---|---|---|
| committer | Rajalakshmi Srinivasaraghavan <rajis@linux.ibm.com> | 2023-08-01 07:41:17 -0500 |
| commit | 21841f0d562f0e944c4d267a28cc3ebd19c847e9 (patch) | |
| tree | 30b6e0831da1a801e96c91b5c2781312ce2c4624 /sysdeps/powerpc/powerpc32/power4 | |
| parent | 5c37d2065286d3db7b974266a3002bb5747d2e5d (diff) | |
| download | glibc-21841f0d562f0e944c4d267a28cc3ebd19c847e9.tar.gz glibc-21841f0d562f0e944c4d267a28cc3ebd19c847e9.tar.xz glibc-21841f0d562f0e944c4d267a28cc3ebd19c847e9.zip | |
PowerPC: Influence cpu/arch hwcap features via GLIBC_TUNABLES
This patch enables the option to influence hwcaps used by PowerPC.
The environment variable, GLIBC_TUNABLES=glibc.cpu.hwcaps=-xxx,yyy,-zzz....,
can be used to enable CPU/ARCH feature yyy, disable CPU/ARCH feature xxx
and zzz, where the feature name is case-sensitive and has to match the ones
mentioned in the file{sysdeps/powerpc/dl-procinfo.c}.
Note that the hwcap tunables only used in the IFUNC selection.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/powerpc/powerpc32/power4')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c | 4 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h | 10 |
2 files changed, 9 insertions, 5 deletions
diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c b/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c index b4f80539e7..986c37d71e 100644 --- a/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c +++ b/sysdeps/powerpc/powerpc32/power4/multiarch/ifunc-impl-list.c @@ -21,6 +21,7 @@ #include <wchar.h> #include <ldsodefs.h> #include <ifunc-impl-list.h> +#include <cpu-features.h> size_t __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, @@ -28,7 +29,8 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, { size_t i = max; - unsigned long int hwcap = GLRO(dl_hwcap); + const struct cpu_features *features = &GLRO(dl_powerpc_cpu_features); + unsigned long int hwcap = features->hwcap; /* hwcap contains only the latest supported ISA, the code checks which is and fills the previous supported ones. */ if (hwcap & PPC_FEATURE_ARCH_2_06) diff --git a/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h b/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h index 3dd00e02ee..4f075d37fd 100644 --- a/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h +++ b/sysdeps/powerpc/powerpc32/power4/multiarch/init-arch.h @@ -16,6 +16,7 @@ <https://www.gnu.org/licenses/>. */ #include <ldsodefs.h> +#include <cpu-features.h> /* The code checks if _rtld_global_ro was realocated before trying to access the dl_hwcap field. The assembly is to make the compiler not optimize the @@ -32,11 +33,12 @@ # define __GLRO(value) GLRO(value) #endif -/* dl_hwcap contains only the latest supported ISA, the macro checks which is - and fills the previous ones. */ +/* Get the hardware information post the tunables set, the macro checks + it and fills the previous ones. */ #define INIT_ARCH() \ - unsigned long int hwcap = __GLRO(dl_hwcap); \ - unsigned long int __attribute__((unused)) hwcap2 = __GLRO(dl_hwcap2); \ + const struct cpu_features *features = &GLRO(dl_powerpc_cpu_features); \ + unsigned long int hwcap = features->hwcap; \ + unsigned long int __attribute__((unused)) hwcap2 = features->hwcap2; \ bool __attribute__((unused)) use_cached_memopt = \ __GLRO(dl_powerpc_cpu_features.use_cached_memopt); \ if (hwcap & PPC_FEATURE_ARCH_2_06) \ |