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Diffstat (limited to 'src/setjmp/x86_64')
-rw-r--r--src/setjmp/x86_64/longjmp.s24
-rw-r--r--src/setjmp/x86_64/setjmp.s25
2 files changed, 49 insertions, 0 deletions
diff --git a/src/setjmp/x86_64/longjmp.s b/src/setjmp/x86_64/longjmp.s
new file mode 100644
index 00000000..c63b0c95
--- /dev/null
+++ b/src/setjmp/x86_64/longjmp.s
@@ -0,0 +1,24 @@
+/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */
+.global _longjmp
+.global longjmp
+.type _longjmp,%function
+.type longjmp,%function
+_longjmp:
+longjmp:
+ mov %rsi,%rax /* val will be longjmp return */
+ test %rax,%rax
+ jnz .L0
+ inc %rax /* if val==0, val=1 per longjmp semantics */
+.L0:
+ movq (%rdi),%rbx /* rdi is the jmp_buf, restore regs from it */
+ movq 8(%rdi),%rbp
+ movq 16(%rdi),%r12
+ movq 24(%rdi),%r13
+ movq 32(%rdi),%r14
+ movq 40(%rdi),%r15
+ movq 48(%rdi),%rdx /* this ends up being the stack pointer */
+ mov %rdx,%rsp
+ movq 56(%rdi),%rdx /* this is the instruction pointer */
+ jmp *%rdx /* goto saved address without altering rsp */
+.size _longjmp,.-_longjmp
+.size longjmp,.-longjmp
diff --git a/src/setjmp/x86_64/setjmp.s b/src/setjmp/x86_64/setjmp.s
new file mode 100644
index 00000000..8f29fa81
--- /dev/null
+++ b/src/setjmp/x86_64/setjmp.s
@@ -0,0 +1,25 @@
+/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */
+.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)
+ leaq 8(%rsp),%rdx /* this is our rsp WITHOUT current ret addr */
+ mov %rdx,48(%rdi)
+ movq (%rsp),%rdx /* save return addr ptr for new rip */
+ mov %rdx,56(%rdi)
+ xor %rax,%rax /* always return 0 */
+ ret
+.size __setjmp,.-__setjmp
+.size _setjmp,.-_setjmp
+.size setjmp,.-setjmp