Port musl to x86-64. One giant commit!

[musl] / src / thread / x86_64 / __unmapself.s

diff --git a/src/thread/x86_64/__unmapself.s b/src/thread/x86_64/__unmapself.s
new file mode 100644 (file)
index 0000000..59092ea
--- /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