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LoongArch: Add glibc.cpu.hwcap support.

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The current IFUNC selection is always using the most recent
features which are available via AT_HWCAP.  But in
some scenarios it is useful to adjust this selection.

The environment variable:

GLIBC_TUNABLES=glibc.cpu.hwcaps=-xxx,yyy,zzz,....

can be used to enable HWCAP feature yyy, disable HWCAP feature xxx,
where the feature name is case-sensitive and has to match the ones
used in sysdeps/loongarch/cpu-tunables.c.

Signed-off-by: caiyinyu <caiyinyu@loongson.cn>
This commit is contained in:
caiyinyu
2023-09-15 17:35:19 +08:00
parent f4724843ad
commit 095067efdf
13 changed files with 475 additions and 9 deletions
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17
sysdeps/unix/sysv/linux/loongarch/cpu-features.h
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@@ -19,12 +19,23 @@
#ifndef _CPU_FEATURES_LOONGARCH64_H
#define _CPU_FEATURES_LOONGARCH64_H
#include <stdint.h>
#include <sys/auxv.h>
#define SUPPORT_UAL (GLRO (dl_hwcap) & HWCAP_LOONGARCH_UAL)
#define SUPPORT_LSX (GLRO (dl_hwcap) & HWCAP_LOONGARCH_LSX)
#define SUPPORT_LASX (GLRO (dl_hwcap) & HWCAP_LOONGARCH_LASX)
struct cpu_features
{
uint64_t hwcap;
};
/* Get a pointer to the CPU features structure. */
extern const struct cpu_features *
_dl_larch_get_cpu_features (void) __attribute__ ((pure));
#define SUPPORT_UAL (GLRO (dl_larch_cpu_features).hwcap & HWCAP_LOONGARCH_UAL)
#define SUPPORT_LSX (GLRO (dl_larch_cpu_features).hwcap & HWCAP_LOONGARCH_LSX)
#define SUPPORT_LASX (GLRO (dl_larch_cpu_features).hwcap & HWCAP_LOONGARCH_LASX)
#define RTLD_SUPPORT_LSX (GLRO (dl_hwcap) & HWCAP_LOONGARCH_LSX)
#define RTLD_SUPPORT_LASX (GLRO (dl_hwcap) & HWCAP_LOONGARCH_LASX)
#define INIT_ARCH()
#endif /* _CPU_FEATURES_LOONGARCH64_H */