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| author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2016-05-24 10:39:13 +0200 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.vnet.ibm.com> | 2016-05-24 10:39:13 +0200 |
| commit | 71655832555411915d157b17253c8ffe0848533a (patch) | |
| tree | d1adce32bdf4c1a431d1e40ea5d92cd0eece8335 /sysdeps/s390/multiarch | |
| parent | 074b0f27d9b9cdfb58c5c7e7f4129546084582b2 (diff) | |
| download | glibc-71655832555411915d157b17253c8ffe0848533a.zip glibc-71655832555411915d157b17253c8ffe0848533a.tar.gz glibc-71655832555411915d157b17253c8ffe0848533a.tar.bz2 | |
S390: Do not call memcpy, memcmp, memset within libc.so via ifunc-plt.
On s390, the memcpy, memcmp, memset functions are IFUNC symbols,
which are created with s390_libc_ifunc-macro.
This macro creates a __GI_ symbol which is set to the
ifunced symbol. Thus calls within libc.so to e.g. memcpy
result in a call to *ABS*+0x954c0@plt stub and afterwards
to the resolved memcpy-ifunc-variant.
This patch sets the __GI_ symbol to the default-ifunc-variant
to avoid the plt call. The __GI_ symbols are now created at the
default variant of ifunced function.
ChangeLog:
* sysdeps/s390/multiarch/ifunc-resolve.h (s390_libc_ifunc):
Remove __GI_ symbol.
* sysdeps/s390/s390-32/multiarch/memcmp-s390.S: Add __GI_memcmp symbol.
* sysdeps/s390/s390-64/multiarch/memcmp-s390x.S: Likewise.
* sysdeps/s390/s390-32/multiarch/memcpy-s390.S: Add __GI_memcpy symbol.
* sysdeps/s390/s390-64/multiarch/memcpy-s390x.S: Likewise.
* sysdeps/s390/s390-32/multiarch/memset-s390.S: Add __GI_memset symbol.
* sysdeps/s390/s390-64/multiarch/memset-s390x.S: Likewise.
Diffstat (limited to 'sysdeps/s390/multiarch')
| -rw-r--r-- | sysdeps/s390/multiarch/ifunc-resolve.h | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/sysdeps/s390/multiarch/ifunc-resolve.h b/sysdeps/s390/multiarch/ifunc-resolve.h index 744a0d8..26e097a 100644 --- a/sysdeps/s390/multiarch/ifunc-resolve.h +++ b/sysdeps/s390/multiarch/ifunc-resolve.h @@ -44,9 +44,7 @@ #define s390_libc_ifunc(FUNC) \ __asm__ (".globl " #FUNC "\n\t" \ ".type " #FUNC ",@gnu_indirect_function\n\t" \ - ".set " #FUNC ",__resolve_" #FUNC "\n\t" \ - ".globl __GI_" #FUNC "\n\t" \ - ".set __GI_" #FUNC "," #FUNC "\n"); \ + ".set " #FUNC ",__resolve_" #FUNC "\n\t"); \ \ /* Make the declarations of the optimized functions hidden in order to prevent GOT slots being generated for them. */ \ |