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[AArch64] Use __getauxval instead of getauxval in LSE detection code in libgcc 

This version of the fix uses __getauxval instead of getauxval.
The whole thing is guarded simply on __gnu_linux__.
__getauxval was introduced in 2.16 but the aarch64 port was added in 2.17 so in practice I expect all aarch64 glibcs to support __getauxval.

Bootstrapped and tested on aarch64-none-linux-gnu.
Also tested on aarch64-none-elf.

2020-05-06  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>

	* config/aarch64/lse-init.c (init_have_lse_atomics): Use __getauxval
	instead of getauxval.
	(AT_HWCAP): Define.
	(HWCAP_ATOMICS): Define.
	Guard detection on __gnu_linux__.
This commit is contained in:
Kyrylo Tkachov 2020-05-06 16:20:38 +01:00
parent 4e849a74a8
commit 1266778548
2 changed files with 17 additions and 8 deletions
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8
libgcc/ChangeLog
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@ -1,3 +1,11 @@
2020-05-06 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* config/aarch64/lse-init.c (init_have_lse_atomics): Use __getauxval
instead of getauxval.
(AT_HWCAP): Define.
(HWCAP_ATOMICS): Define.
Guard detection on __gnu_linux__.
2020-05-05 Michael Meissner <meissner@linux.ibm.com>
* config.host: Delete changes meant for a private branch.

17
libgcc/config/aarch64/lse-init.c
View File

@ -29,19 +29,20 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
_Bool __aarch64_have_lse_atomics
__attribute__((visibility("hidden"), nocommon));
/* Disable initialization of __aarch64_have_lse_atomics during bootstrap. */
#if !defined(inhibit_libc) && defined(HAVE_SYS_AUXV_H)
# include <sys/auxv.h>
/* Gate availability of __getauxval on glibc. All AArch64-supporting glibc
versions support it. */
#ifdef __gnu_linux__
/* Disable initialization if the system headers are too old. */
# if defined(AT_HWCAP) && defined(HWCAP_ATOMICS)
# define AT_HWCAP 16
# define HWCAP_ATOMICS (1 << 8)
unsigned long int __getauxval (unsigned long int);
static void __attribute__((constructor))
init_have_lse_atomics (void)
{
unsigned long hwcap = getauxval (AT_HWCAP);
unsigned long hwcap = __getauxval (AT_HWCAP);
__aarch64_have_lse_atomics = (hwcap & HWCAP_ATOMICS) != 0;
}
# endif /* HWCAP */
#endif /* inhibit_libc */
#endif /* __gnu_linux__ */