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| author | H.J. Lu <hjl.tools@gmail.com> | 2015-07-12 14:38:58 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2015-08-03 14:32:47 -0700 |
| commit | 08094d48c130d3ae6182296ef3c9561ca1066b39 (patch) | |
| tree | cdfba5498d2451b4066ea469e74591eaf556fe9d | |
| parent | 723a5bd465082390bd9369d4f95ec11b32cf47dd (diff) | |
| download | glibc-08094d48c130d3ae6182296ef3c9561ca1066b39.tar.gz | |
Align stack to 16 bytes when calling __setcontext
Don't use pop to restore %rdi so that stack is aligned to 16 bytes
when calling __setcontext.
[BZ #18661]
* sysdeps/unix/sysv/linux/x86_64/__start_context.S
(__start_context): Don't use pop to restore %rdi so that stack
is aligned to 16 bytes when calling __setcontext.
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/__start_context.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/__start_context.S b/sysdeps/unix/sysv/linux/x86_64/__start_context.S index 52a5afa9a6..96366e0536 100644 --- a/sysdeps/unix/sysv/linux/x86_64/__start_context.S +++ b/sysdeps/unix/sysv/linux/x86_64/__start_context.S @@ -31,8 +31,8 @@ ENTRY(__start_context) on the stack pointer for the next context. */ movq %rbx, %rsp - popq %rdi /* This is the next context. */ - cfi_adjust_cfa_offset(-8) + /* Don't use pop here so that stack is aligned to 16 bytes. */ + movq (%rsp), %rdi /* This is the next context. */ testq %rdi, %rdi je 2f /* If it is zero exit. */ |