From 323272db175204b951f119dae4bd99ef05e20f13 Mon Sep 17 00:00:00 2001
From: rofl0r <retnyg@gmx.net>
Date: Tue, 7 Jan 2014 22:43:34 +0100
Subject: import vanilla x86_64 code as x32

---
 src/setjmp/x32/longjmp.s | 22 ++++++++++++++++++++++
 src/setjmp/x32/setjmp.s  | 22 ++++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 src/setjmp/x32/longjmp.s
 create mode 100644 src/setjmp/x32/setjmp.s

(limited to 'src/setjmp/x32')

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 */
diff --git a/src/setjmp/x32/setjmp.s b/src/setjmp/x32/setjmp.s
new file mode 100644
index 00000000..98f58b8d
--- /dev/null
+++ b/src/setjmp/x32/setjmp.s
@@ -0,0 +1,22 @@
+/* Copyright 2011-2012 Nicholas J. Kain, licensed under standard MIT license */
+.global __setjmp
+.global _setjmp
+.global setjmp
+.type __setjmp,@function
+.type _setjmp,@function
+.type setjmp,@function
+__setjmp:
+_setjmp:
+setjmp:
+	mov %rbx,(%rdi)         /* rdi is jmp_buf, move registers onto it */
+	mov %rbp,8(%rdi)
+	mov %r12,16(%rdi)
+	mov %r13,24(%rdi)
+	mov %r14,32(%rdi)
+	mov %r15,40(%rdi)
+	lea 8(%rsp),%rdx        /* this is our rsp WITHOUT current ret addr */
+	mov %rdx,48(%rdi)
+	mov (%rsp),%rdx         /* save return addr ptr for new rip */
+	mov %rdx,56(%rdi)
+	xor %rax,%rax           /* always return 0 */
+	ret
-- 
cgit v1.2.1