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-rw-r--r--src/thread/x86_64/__set_thread_area.s15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/thread/x86_64/__set_thread_area.s b/src/thread/x86_64/__set_thread_area.s
new file mode 100644
index 00000000..ed35b7a8
--- /dev/null
+++ b/src/thread/x86_64/__set_thread_area.s
@@ -0,0 +1,15 @@
+/* Copyright 2011 Nicholas J. Kain, licensed GNU LGPL 2.1 or later */
+.text
+.global __set_thread_area
+.type __set_thread_area,%function
+__set_thread_area:
+ push %rbx /* save x86_64 abi clobbered registers */
+ push %r11
+ mov %rdi,%rsi /* shift for syscall */
+ movl $0x1002,%edi /* SET_FS register */
+ movl $158,%eax /* set fs segment to */
+ syscall /* arch_prctl(SET_FS, arg)*/
+ pop %r11 /* restore clobbered registers */
+ pop %rbx
+ ret
+.size __set_thread_area,.-__set_thread_area