path: root/src/thread/arm/clone.s
diff options
authorRich Felker <>2011-09-18 16:44:54 -0400
committerRich Felker <>2011-09-18 16:44:54 -0400
commitd960d4f2cbf18ff3476c7ac03698ec253885dd8e (patch)
treec7570054ccddf4febc86c046a0b90b3021d1a457 /src/thread/arm/clone.s
parent4f4bf0ad2e8c729de92db06318b9614ab2cdcc5c (diff)
initial commit of the arm port
this port assumes eabi calling conventions, eabi linux syscall convention, and presence of the kernel helpers at 0xffff0f?0 needed for threads support. otherwise it makes very few assumptions, and the code should work even on armv4 without thumb support, as well as on systems with thumb interworking. the bits headers declare this a little endian system, but as far as i can tell the code should work equally well on big endian. some small details are probably broken; so far, testing has been limited to qemu/aboriginal linux.
Diffstat (limited to 'src/thread/arm/clone.s')
1 files changed, 35 insertions, 0 deletions
diff --git a/src/thread/arm/clone.s b/src/thread/arm/clone.s
new file mode 100644
index 00000000..65cd3f5a
--- /dev/null
+++ b/src/thread/arm/clone.s
@@ -0,0 +1,35 @@
+.text __clone
+.weak clone
+.type __clone,%function
+.type clone,%function
+ stmfd sp!,{r4,r5,r6,r7}
+ mov r7,#120
+ mov r6,r3
+ mov r5,r0
+ mov r0,r2
+ and r1,r1,#-16
+ ldr r2,[sp,#16]
+ ldr r3,[sp,#20]
+ ldr r4,[sp,#24]
+ svc 0
+ tst r0,r0
+ beq 1f
+ ldmfd sp!,{r4,r5,r6,r7}
+ tst lr,#1
+ moveq pc,lr
+ bx lr
+1: mov r0,r6
+ tst r5,#1
+ bne 1f
+ mov lr,pc
+ mov pc,r5
+2: mov r1,r0
+ mov r0,#1
+ svc
+1: blx r5
+ b 2b