Libc-498.1.1.tar.gz

[apple/libc.git] / x86_64 / sys / setjmp.s

diff --git a/x86_64/sys/setjmp.s b/x86_64/sys/setjmp.s
index 05ca533126d715244887604ae3cad414cb8f8fcf..586608621a43c57d361c362dd3e6b2143ffbd60c 100644 (file)
--- a/x86_64/sys/setjmp.s
+++ b/x86_64/sys/setjmp.s
@@ -72,10 +72,11 @@ LEAF(_setjmp, 0)
        pushq   %rdi                    // Preserve the jmp_buf across the call
        movl    $1, %edi                // how = SIG_BLOCK
        xorq    %rsi, %rsi            // set = NULL
-       subq    $8, %rsp                // Allocate space for the return from sigprocmask
-       movq    %rsp, %rdx
+       subq    $16, %rsp               // Allocate space for the return from sigprocmask + 8 to align stack
+       movq    %rsp, %rdx              // oset = allocated space
        CALL_EXTERN(_sigprocmask)
        popq    %rax                    // Save the mask
+       addq    $8, %rsp                // Restore the stack to before we align it
        popq    %rdi                    // jmp_buf (struct sigcontext *)
        movq    %rax, JB_MASK(%rdi)
 L_do__setjmp:
@@ -93,8 +94,8 @@ LEAF(_longjmp, 0)
        pushq   %rsi                            // Preserve the value across the call
        pushq   JB_MASK(%rdi)           // Put the mask on the stack
        movq    $3, %rdi                        // how = SIG_SETMASK
-       movq    %rsp, %rsi        // set = address where we stored the mask
-       xorq    %rdx, %rdx                    // oset = NULL
+       movq    %rsp, %rsi                      // set = address where we stored the mask
+       xorq    %rdx, %rdx                      // oset = NULL
        CALL_EXTERN_AGAIN(_sigprocmask)
        addq    $8, %rsp
        popq    %rsi                            // Restore the value