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commit 8e1f346462d8c1b238a7c6bb501c45b381a45e4d
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Sun Jul 12 14:38:58 2015 -0700
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.
diff --git a/sysdeps/unix/sysv/linux/x86_64/__start_context.S b/sysdeps/unix/sysv/linux/x86_64/__start_context.S
index 9f2ee23736bfbf70..f59d6b4f7f3d3d43 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. */