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-rw-r--r--UnixPkg/Library/UnixBaseLib/X64/SwitchStack.S5
1 files changed, 1 insertions, 4 deletions
diff --git a/UnixPkg/Library/UnixBaseLib/X64/SwitchStack.S b/UnixPkg/Library/UnixBaseLib/X64/SwitchStack.S
index 3a84b0d22f..fd7ba6e717 100644
--- a/UnixPkg/Library/UnixBaseLib/X64/SwitchStack.S
+++ b/UnixPkg/Library/UnixBaseLib/X64/SwitchStack.S
@@ -40,12 +40,9 @@ ASM_PFX(InternalSwitchStack):
movq %rcx, %rax
movq %rdx, %rcx
movq %r8, %rdx
- movq %r9, %rsp
-
#
# Reserve space for register parameters (rcx, rdx, r8 & r9) on the stack,
# in case the callee wishes to spill them.
#
- subq $40, %rsp // 32-byte shadow space plus alignment pad
-
+ lea -0x20(%r9), %rsp
call *%rax