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| author | Stefan Liebler <stli@linux.vnet.ibm.com> | 2017-06-27 15:23:43 +0200 |
|---|---|---|
| committer | Stefan Liebler <stli@linux.vnet.ibm.com> | 2017-06-27 15:23:43 +0200 |
| commit | 83653f804dca6e8e9606e20e708be45b8422d96c (patch) | |
| tree | ac749dfd641118813b3f4f377eaac00442ae6638 /sysdeps/s390/s390-64 | |
| parent | 39bd76df3d61c6d83c5aa8bab06c7c1dbe7159ac (diff) | |
| download | glibc-83653f804dca6e8e9606e20e708be45b8422d96c.tar.gz glibc-83653f804dca6e8e9606e20e708be45b8422d96c.tar.xz glibc-83653f804dca6e8e9606e20e708be45b8422d96c.zip | |
S390: Save and restore r12 in TLS_IE macro.
The testcases elf/tst-tls1-static and elf/tst-tls2-static are failing on s390 if gcc is configured with --enable-default-pie. According to binutils, there are only four valid cases for IE -> LE transition: lg %rx,(0,%ry) -> sllg %rx,%ry,0 lg %rx,(%ry,0) -> sllg %rx,%ry,0 lg %rx,(%ry,%r12) -> sllg %rx,%ry,0 lg %rx,(%r12,%ry) -> sllg %rx,%ry,0 Thus I've adjusted the TLS_IE macro in s390 tls-macros.h files in PIC case in order to use r12 for the address of global offset table. The adjusted macro definition is not used if gcc is not configured with --enable-default-pie. ChangeLog: * sysdeps/s390/s390-32/tls-macros.h (TLS_IE): Use r12 for GOT address. * sysdeps/s390/s390-64/tls-macros.h (TLS_IE): Likewise.
Diffstat (limited to 'sysdeps/s390/s390-64')
| -rw-r--r-- | sysdeps/s390/s390-64/tls-macros.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/sysdeps/s390/s390-64/tls-macros.h b/sysdeps/s390/s390-64/tls-macros.h index d70ea6ce0c..449a843d69 100644 --- a/sysdeps/s390/s390-64/tls-macros.h +++ b/sysdeps/s390/s390-64/tls-macros.h @@ -8,13 +8,15 @@ #ifdef PIC # define TLS_IE(x) \ - ({ unsigned long __offset, __got; \ + ({ unsigned long __offset, __save12; \ __asm__ ("bras %0,0f\n\t" \ ".quad " #x "@gotntpoff\n" \ - "0:\tlarl %1,_GLOBAL_OFFSET_TABLE_\n\t" \ + "0:\tlgr %1,%%r12\n\t" \ + "larl %%r12,_GLOBAL_OFFSET_TABLE_\n\t" \ "lg %0,0(%0)\n\t" \ - "lg %0,0(%0,%1):tls_load:" #x "\n" \ - : "=&a" (__offset), "=&a" (__got) : : "cc" ); \ + "lg %0,0(%0,%%r12):tls_load:" #x "\n\t" \ + "lgr %%r12,%1\n" \ + : "=&a" (__offset), "=&a" (__save12) : : "cc" ); \ (int *) (__builtin_thread_pointer() + __offset); }) #else # define TLS_IE(x) \ |