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-rw-r--r--src/thread/superh/clone.s47
1 files changed, 47 insertions, 0 deletions
diff --git a/src/thread/superh/clone.s b/src/thread/superh/clone.s
new file mode 100644
index 00000000..d6c9184d
--- /dev/null
+++ b/src/thread/superh/clone.s
@@ -0,0 +1,47 @@
+.text
+.global __clone
+.type __clone, @function
+__clone:
+! incoming: fn stack flags arg ptid tls ctid
+! r4 r5 r6 r7 @r15 @(4,r15) @(8,r15)
+
+ mov #-16, r0
+ and r0, r5
+
+ mov r4, r1 ! r1 = fn
+ mov r7, r2 ! r2 = arg
+
+ mov #120, r3 ! r3 = __NR_clone
+ mov r6, r4 ! r4 = flags
+ !mov r5, r5 ! r5 = stack
+ mov.l @r15, r6 ! r6 = ptid
+ mov.l @(8,r15), r7 ! r7 = ctid
+ mov.l @(4,r15), r0 ! r0 = tls
+ trapa #21
+
+ or r0, r0
+ or r0, r0
+ or r0, r0
+ or r0, r0
+ or r0, r0
+
+ cmp/eq #0, r0
+ bt 1f
+
+ ! we are the parent, return
+ rts
+ nop
+
+1: ! we are the child, call fn(arg)
+ jsr @r1
+ mov r2, r4
+
+ mov #1, r3 ! __NR_exit
+ mov r0, r4
+ trapa #17
+
+ or r0, r0
+ or r0, r0
+ or r0, r0
+ or r0, r0
+ or r0, r0