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-rw-r--r--src/internal/superh/syscall.s22
1 files changed, 22 insertions, 0 deletions
diff --git a/src/internal/superh/syscall.s b/src/internal/superh/syscall.s
new file mode 100644
index 00000000..a8fda1c0
--- /dev/null
+++ b/src/internal/superh/syscall.s
@@ -0,0 +1,22 @@
+.global __syscall
+.type __syscall, @function
+__syscall:
+ ! The kernel syscall entry point documents that the trap number indicates
+ ! the number of arguments being passed, but it then ignores that information.
+ ! Since we do not actually know how many arguments are being passed, we will
+ ! say there are six, since that is the maximum we support here.
+ mov r4, r3
+ mov r5, r4
+ mov r6, r5
+ mov r7, r6
+ mov.l @r15, r7
+ mov.l @(4,r15), r0
+ mov.l @(8,r15), r1
+ trapa #22
+ or r0, r0
+ or r0, r0
+ or r0, r0
+ or r0, r0
+ or r0, r0
+ rts
+ nop