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| author | Rich Felker <dalias@aerifal.cx> | 2012-11-11 13:56:37 -0500 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2012-11-11 13:56:37 -0500 |
| commit | e9b885ee550e8a3eabc9d11c469baf1cfaf64f55 (patch) | |
| tree | b2b61c6270cf5572df5dabc2581d4ba287d33a91 | |
| parent | dc059f03e8277abe3f515f350bd9615416aaa5ef (diff) | |
| download | musl-e9b885ee550e8a3eabc9d11c469baf1cfaf64f55.tar.gz musl-e9b885ee550e8a3eabc9d11c469baf1cfaf64f55.tar.bz2 musl-e9b885ee550e8a3eabc9d11c469baf1cfaf64f55.tar.xz musl-e9b885ee550e8a3eabc9d11c469baf1cfaf64f55.zip | |
fix clobber of edx in i386 vsyscall asm
this function does not obey the normal calling convention; like a
syscall instruction, it's expected not to clobber any registers except
the return value. clobbering edx could break callers that were reusing
the value cached in edx after the syscall returns.
| -rw-r--r-- | src/internal/i386/syscall.s | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/internal/i386/syscall.s b/src/internal/i386/syscall.s index 291168c3..2914acee 100644 --- a/src/internal/i386/syscall.s +++ b/src/internal/i386/syscall.s @@ -16,7 +16,8 @@ __vsyscall: mov 12(%esp),%edi push %eax call 1f -2: pop %ebx +2: mov %ebx,%edx + pop %ebx pop %ebx pop %edi ret |