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| author | Ryan S. Arnold <rsa@linux.vnet.ibm.com> | 2013-05-03 14:14:40 -0500 |
|---|---|---|
| committer | Ryan S. Arnold <rsa@linux.vnet.ibm.com> | 2013-05-03 14:14:40 -0500 |
| commit | 1da1702d0c3996db36d44f007d7deebb7e637c08 (patch) | |
| tree | 8787e734b612d9400f7553ce6612bd7d42912b7e /elf/dl-sysdep.c | |
| parent | 1324e37f2e36fb641b82ad7b353fa28d5d57e44b (diff) | |
| download | glibc-1da1702d0c3996db36d44f007d7deebb7e637c08.tar.gz | |
Add support for AT_HWCAP2.
Diffstat (limited to 'elf/dl-sysdep.c')
| -rw-r--r-- | elf/dl-sysdep.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/elf/dl-sysdep.c b/elf/dl-sysdep.c index d8f3dd2fb9..832a57b6d6 100644 --- a/elf/dl-sysdep.c +++ b/elf/dl-sysdep.c @@ -107,6 +107,10 @@ _dl_sysdep_start (void **start_argptr, uintptr_t new_sysinfo = 0; #endif + /* Don't rely on a specific order of AT_HWCAP and AT_HWCAP2. Collate into a + zeroed temp and assign to _dl_hwcap after the auxv has been parsed. */ + uint64_t hwcap = 0; + __libc_stack_end = DL_STACK_END (start_argptr); DL_FIND_ARG_COMPONENTS (start_argptr, _dl_argc, INTUSE(_dl_argv), _environ, GLRO(dl_auxv)); @@ -154,7 +158,10 @@ _dl_sysdep_start (void **start_argptr, GLRO(dl_platform) = (void *) av->a_un.a_val; break; case AT_HWCAP: - GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val; + hwcap |= (unsigned long int) av->a_un.a_val; + break; + case AT_HWCAP2: + hwcap |= ((uint64_t) av->a_un.a_val) << 32; break; case AT_CLKTCK: GLRO(dl_clktck) = av->a_un.a_val; @@ -180,6 +187,8 @@ _dl_sysdep_start (void **start_argptr, #endif } + GLRO(dl_hwcap) = hwcap; + #ifndef HAVE_AUX_SECURE if (seen != -1) { @@ -298,6 +307,7 @@ _dl_show_auxv (void) [AT_SYSINFO - 2] = { "SYSINFO: 0x", hex }, [AT_SYSINFO_EHDR - 2] = { "SYSINFO_EHDR: 0x", hex }, [AT_RANDOM - 2] = { "RANDOM: 0x", hex }, + [AT_HWCAP2 - 2] = { "HWCAP2: ", hex }, }; unsigned int idx = (unsigned int) (av->a_type - 2); @@ -309,10 +319,12 @@ _dl_show_auxv (void) assert (AT_NULL == 0); assert (AT_IGNORE == 1); - if (av->a_type == AT_HWCAP) + if (av->a_type == AT_HWCAP || av->a_type == AT_HWCAP2) { - /* This is handled special. */ - if (_dl_procinfo (av->a_un.a_val) == 0) + /* HWCAP bits are translated into representative strings, per + platform. */ + if (_dl_procinfo (av->a_type, av->a_un.a_val) == 0) + continue; } |