diff options
| author | Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> | 2020-01-10 19:14:56 -0300 |
|---|---|---|
| committer | Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com> | 2020-01-17 09:05:03 -0300 |
| commit | 18363b4f010da9ba459b13310b113ac0647c2fcc (patch) | |
| tree | a9b4b22d7fb65d7d219eb0e10b996de971da54e9 /sysdeps/powerpc/powerpc32/memset.S | |
| parent | c908ae0492cb9c68736306e2bceec7244a940568 (diff) | |
| download | glibc-18363b4f010da9ba459b13310b113ac0647c2fcc.tar.gz | |
powerpc: Move cache line size to rtld_global_ro
GCC 10.0 enabled -fno-common by default and this started to point that
__cache_line_size had been implemented in 2 different places: loader and
libc.
In order to avoid this duplication, the libc variable has been removed
and the loader variable is moved to rtld_global_ro.
File sysdeps/unix/sysv/linux/powerpc/dl-auxv.h has been added in order
to reuse code for both static and dynamic linking scenarios.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'sysdeps/powerpc/powerpc32/memset.S')
| -rw-r--r-- | sysdeps/powerpc/powerpc32/memset.S | 29 |
1 files changed, 13 insertions, 16 deletions
diff --git a/sysdeps/powerpc/powerpc32/memset.S b/sysdeps/powerpc/powerpc32/memset.S index 5f614c07d7..26c37f8a17 100644 --- a/sysdeps/powerpc/powerpc32/memset.S +++ b/sysdeps/powerpc/powerpc32/memset.S @@ -17,12 +17,13 @@ <https://www.gnu.org/licenses/>. */ #include <sysdep.h> +#include <rtld-global-offsets.h> /* void * [r3] memset (void *s [r3], int c [r4], size_t n [r5])); Returns 's'. The memset is done in four sizes: byte (8 bits), word (32 bits), - 32-byte blocks (256 bits) and __cache_line_size (128, 256, 1024 bits). + 32-byte blocks (256 bits) and cache line size (128, 256, 1024 bits). There is a special case for setting whole cache lines to 0, which takes advantage of the dcbz instruction. */ @@ -95,7 +96,7 @@ L(caligned): /* Check if we can use the special case for clearing memory using dcbz. This requires that we know the correct cache line size for this - processor. Getting the __cache_line_size may require establishing GOT + processor. Getting the cache line size may require establishing GOT addressability, so branch out of line to set this up. */ beq cr1, L(checklinesize) @@ -230,26 +231,22 @@ L(medium_28t): blr L(checklinesize): -#ifdef SHARED - mflr rTMP /* If the remaining length is less the 32 bytes then don't bother getting the cache line size. */ beq L(medium) -/* Establishes GOT addressability so we can load __cache_line_size - from static. This value was set from the aux vector during startup. */ +#ifdef PIC + mflr rTMP +/* Establishes GOT addressability so we can load the cache line size + from rtld_global_ro. This value was set from the aux vector during + startup. */ SETUP_GOT_ACCESS(rGOT,got_label) - addis rGOT,rGOT,__cache_line_size-got_label@ha - lwz rCLS,__cache_line_size-got_label@l(rGOT) + addis rGOT,rGOT,_GLOBAL_OFFSET_TABLE_-got_label@ha + addi rGOT,rGOT,_GLOBAL_OFFSET_TABLE_-got_label@l mtlr rTMP -#else -/* Load __cache_line_size from static. This value was set from the - aux vector during startup. */ - lis rCLS,__cache_line_size@ha -/* If the remaining length is less the 32 bytes then don't bother getting - the cache line size. */ - beq L(medium) - lwz rCLS,__cache_line_size@l(rCLS) #endif +/* Load rtld_global_ro._dl_cache_line_size. */ + __GLRO(rCLS, rGOT, _dl_cache_line_size, + RTLD_GLOBAL_RO_DL_CACHE_LINE_SIZE_OFFSET) /* If the cache line size was not set then goto to L(nondcbz), which is safe for any cache line size. */ |