path: root/src/thread/arm/syscall_cp.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/syscall_cp.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/syscall_cp.s')
1 files changed, 23 insertions, 0 deletions
diff --git a/src/thread/arm/syscall_cp.s b/src/thread/arm/syscall_cp.s
new file mode 100644
index 00000000..59924fc5
--- /dev/null
+++ b/src/thread/arm/syscall_cp.s
@@ -0,0 +1,23 @@ __syscall_cp_asm
+.type __syscall_cp_asm,%function
+ mov ip,sp
+ stmfd sp!,{r4,r5,r6,r7,lr}
+ stmfd sp!,{r0}
+ bl 1f
+1: mov r4,#(1f-.)
+ add r4,r4,lr
+ str r4,[r0,#4]
+ str sp,[r0]
+ mov r7,r1
+ mov r0,r2
+ mov r1,r3
+ ldmfd ip,{r2,r3,r4,r5,r6}
+1: svc 0
+ ldmfd sp!,{r1}
+ mov r2,#0
+ str r2,[r1]
+ ldmfd sp!,{r4,r5,r6,r7,lr}
+ tst lr,#1
+ moveq pc,lr
+ bx lr