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| author | H.J. Lu <hjl.tools@gmail.com> | 2020-06-29 18:30:54 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-09-11 17:20:52 -0700 |
| commit | 9620398097de3981c1adf5233e2b3478d36bc1b3 (patch) | |
| tree | 20e492ba12ab22a57ed91df3698fdf57eba54810 /sysdeps/unix/sysv | |
| parent | a92f4e6299fe0e3cb6f77e79de00817aece501ce (diff) | |
| download | glibc-9620398097de3981c1adf5233e2b3478d36bc1b3.tar glibc-9620398097de3981c1adf5233e2b3478d36bc1b3.tar.gz glibc-9620398097de3981c1adf5233e2b3478d36bc1b3.tar.bz2 glibc-9620398097de3981c1adf5233e2b3478d36bc1b3.zip | |
x86: Install <sys/platform/x86.h> [BZ #26124]
Install <sys/platform/x86.h> so that programmers can do
#if __has_include(<sys/platform/x86.h>)
#include <sys/platform/x86.h>
#endif
...
if (CPU_FEATURE_USABLE (SSE2))
...
if (CPU_FEATURE_USABLE (AVX2))
...
<sys/platform/x86.h> exports only:
enum
{
COMMON_CPUID_INDEX_1 = 0,
COMMON_CPUID_INDEX_7,
COMMON_CPUID_INDEX_80000001,
COMMON_CPUID_INDEX_D_ECX_1,
COMMON_CPUID_INDEX_80000007,
COMMON_CPUID_INDEX_80000008,
COMMON_CPUID_INDEX_7_ECX_1,
/* Keep the following line at the end. */
COMMON_CPUID_INDEX_MAX
};
struct cpuid_features
{
struct cpuid_registers cpuid;
struct cpuid_registers usable;
};
struct cpu_features
{
struct cpu_features_basic basic;
struct cpuid_features features[COMMON_CPUID_INDEX_MAX];
};
/* Get a pointer to the CPU features structure. */
extern const struct cpu_features *__x86_get_cpu_features
(unsigned int max) __attribute__ ((const));
Since all feature checks are done through macros, programs compiled with
a newer <sys/platform/x86.h> are compatible with the older glibc binaries
as long as the layout of struct cpu_features is identical. The features
array can be expanded with backward binary compatibility for both .o and
.so files. When COMMON_CPUID_INDEX_MAX is increased to support new
processor features, __x86_get_cpu_features in the older glibc binaries
returns NULL and HAS_CPU_FEATURE/CPU_FEATURE_USABLE return false on the
new processor feature. No new symbol version is neeeded.
Both CPU_FEATURE_USABLE and HAS_CPU_FEATURE are provided. HAS_CPU_FEATURE
can be used to identify processor features.
Note: Although GCC has __builtin_cpu_supports, it only supports a subset
of <sys/platform/x86.h> and it is equivalent to CPU_FEATURE_USABLE. It
doesn't support HAS_CPU_FEATURE.
Diffstat (limited to 'sysdeps/unix/sysv')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/ld.abilist | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/64/ld.abilist | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist | 1 |
3 files changed, 3 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/ld.abilist b/sysdeps/unix/sysv/linux/i386/ld.abilist index 0478e22071..04655651b0 100644 --- a/sysdeps/unix/sysv/linux/i386/ld.abilist +++ b/sysdeps/unix/sysv/linux/i386/ld.abilist @@ -3,3 +3,4 @@ GLIBC_2.1 __libc_stack_end D 0x4 GLIBC_2.1 _dl_mcount F GLIBC_2.3 ___tls_get_addr F GLIBC_2.3 __tls_get_addr F +GLIBC_2.33 __x86_get_cpu_features F diff --git a/sysdeps/unix/sysv/linux/x86_64/64/ld.abilist b/sysdeps/unix/sysv/linux/x86_64/64/ld.abilist index d3cdf7611e..e632c6198e 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/ld.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/ld.abilist @@ -2,3 +2,4 @@ GLIBC_2.2.5 __libc_stack_end D 0x8 GLIBC_2.2.5 _dl_mcount F GLIBC_2.2.5 _r_debug D 0x28 GLIBC_2.3 __tls_get_addr F +GLIBC_2.33 __x86_get_cpu_features F diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist index c70bccf782..9d9d0befde 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/ld.abilist @@ -2,3 +2,4 @@ GLIBC_2.16 __libc_stack_end D 0x4 GLIBC_2.16 __tls_get_addr F GLIBC_2.16 _dl_mcount F GLIBC_2.16 _r_debug D 0x14 +GLIBC_2.33 __x86_get_cpu_features F |