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authorrofl0r <retnyg@gmx.net>2014-01-07 22:43:34 +0100
committerrofl0r <retnyg@gmx.net>2014-02-23 11:07:18 +0100
commit323272db175204b951f119dae4bd99ef05e20f13 (patch)
tree70329156d5189294b1e9e7f9c7c326924ad62e35 /src/setjmp/x32/longjmp.s
parent0f169cbb79c39a5b15f7a27d9283cdeb6e122b8f (diff)
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import vanilla x86_64 code as x32
Diffstat (limited to 'src/setjmp/x32/longjmp.s')
-rw-r--r--src/setjmp/x32/longjmp.s22
1 files changed, 22 insertions, 0 deletions
diff --git a/src/setjmp/x32/longjmp.s b/src/setjmp/x32/longjmp.s
new file mode 100644
index 00000000..e175a4b9
--- /dev/null
+++ b/src/setjmp/x32/longjmp.s
@@ -0,0 +1,22 @@
+/* Copyright 2011-2012 Nicholas J. Kain, licensed under standard MIT license */
+.global _longjmp
+.global longjmp
+.type _longjmp,@function
+.type longjmp,@function
+_longjmp:
+longjmp:
+	mov %rsi,%rax           /* val will be longjmp return */
+	test %rax,%rax
+	jnz 1f
+	inc %rax                /* if val==0, val=1 per longjmp semantics */
+1:
+	mov (%rdi),%rbx         /* rdi is the jmp_buf, restore regs from it */
+	mov 8(%rdi),%rbp
+	mov 16(%rdi),%r12
+	mov 24(%rdi),%r13
+	mov 32(%rdi),%r14
+	mov 40(%rdi),%r15
+	mov 48(%rdi),%rdx       /* this ends up being the stack pointer */
+	mov %rdx,%rsp
+	mov 56(%rdi),%rdx       /* this is the instruction pointer */
+	jmp *%rdx               /* goto saved address without altering rsp */