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29 lines
1.1 KiB
29 lines
1.1 KiB
commit 8e1f346462d8c1b238a7c6bb501c45b381a45e4d |
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Author: H.J. Lu <hjl.tools@gmail.com> |
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Date: Sun Jul 12 14:38:58 2015 -0700 |
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Align stack to 16 bytes when calling __setcontext |
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Don't use pop to restore %rdi so that stack is aligned to 16 bytes |
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when calling __setcontext. |
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[BZ #18661] |
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* sysdeps/unix/sysv/linux/x86_64/__start_context.S |
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(__start_context): Don't use pop to restore %rdi so that stack |
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is aligned to 16 bytes when calling __setcontext. |
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diff --git a/sysdeps/unix/sysv/linux/x86_64/__start_context.S b/sysdeps/unix/sysv/linux/x86_64/__start_context.S |
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index 9f2ee23736bfbf70..f59d6b4f7f3d3d43 100644 |
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--- a/sysdeps/unix/sysv/linux/x86_64/__start_context.S |
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+++ b/sysdeps/unix/sysv/linux/x86_64/__start_context.S |
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@@ -31,8 +31,8 @@ ENTRY(__start_context) |
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on the stack pointer for the next context. */ |
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movq %rbx, %rsp |
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- popq %rdi /* This is the next context. */ |
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- cfi_adjust_cfa_offset(-8) |
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+ /* Don't use pop here so that stack is aligned to 16 bytes. */ |
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+ movq (%rsp), %rdi /* This is the next context. */ |
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testq %rdi, %rdi |
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je 2f /* If it is zero exit. */ |
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