1 files changed, 54 insertions, 0 deletions

diff --git a/arch/x86/um/setjmp_64.S b/arch/x86/um/setjmp_64.S
new file mode 100644
index 000000000000..45f547b4043e
--- /dev/null
+++ b/arch/x86/um/setjmp_64.S
@@ -0,0 +1,54 @@
+#
+# arch/x86_64/setjmp.S
+#
+# setjmp/longjmp for the x86-64 architecture
+#
+
+#
+# The jmp_buf is assumed to contain the following, in order:
+#       %rbx
+#       %rsp (post-return)
+#       %rbp
+#       %r12
+#       %r13
+#       %r14
+#       %r15
+#       <return address>
+#
+
+        .text
+        .align 4
+        .globl setjmp
+        .type setjmp, @function
+setjmp:
+        pop  %rsi                       # Return address, and adjust the stack
+        xorl %eax,%eax                  # Return value
+        movq %rbx,(%rdi)
+        movq %rsp,8(%rdi)               # Post-return %rsp!
+        push %rsi                       # Make the call/return stack happy
+        movq %rbp,16(%rdi)
+        movq %r12,24(%rdi)
+        movq %r13,32(%rdi)
+        movq %r14,40(%rdi)
+        movq %r15,48(%rdi)
+        movq %rsi,56(%rdi)              # Return address
+        ret
+
+        .size setjmp,.-setjmp
+
+        .text
+        .align 4
+        .globl longjmp
+        .type longjmp, @function
+longjmp:
+        movl %esi,%eax                  # Return value (int)
+        movq (%rdi),%rbx
+        movq 8(%rdi),%rsp
+        movq 16(%rdi),%rbp
+        movq 24(%rdi),%r12
+        movq 32(%rdi),%r13
+        movq 40(%rdi),%r14
+        movq 48(%rdi),%r15
+        jmp *56(%rdi)
+
+        .size longjmp,.-longjmp