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Diffstat (limited to 'src/thread/x86_64/__unmapself.s')
-rw-r--r--src/thread/x86_64/__unmapself.s24
1 files changed, 24 insertions, 0 deletions
diff --git a/src/thread/x86_64/__unmapself.s b/src/thread/x86_64/__unmapself.s
new file mode 100644
index 00000000..59092eaa
--- /dev/null
+++ b/src/thread/x86_64/__unmapself.s
@@ -0,0 +1,24 @@
+/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */
+.text
+.global __unmapself
+.type __unmapself,%function
+__unmapself:
+ call 1f /* glibc ABI compat */
+ .long -1
+ .long -1
+1: push %rsi /* save arg2 for munmap */
+ push %rdx /* save arg3 for munmap */
+ mov %rdi,%rsi /* rt_sigprocmask() args: move arg1 to rsi */
+ xor %rdi,%rdi
+ xor %rdx,%rdx
+ movq $8,%r10
+ movl $14,%eax /* __NR_rt_sigprocmask */
+ syscall /* call rt_sigprocmask(0,arg1,0,8) */
+ pop %rsi /* munmap() args: reload from stack */
+ pop %rdi
+ movl $11,%eax /* __NR_munmap */
+ syscall /* munmap(arg2,arg3) */
+ xor %rdi,%rdi /* exit() args: always return success */
+ movl $60,%eax /* __NR_exit */
+ syscall /* exit(0) */
+.size __unmapself,.-__unmapself