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Unified Diff: fusl/src/internal/sh/syscall.s

Issue 1573973002: Add a "fork" of musl as //fusl. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 11 months ago
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Index: fusl/src/internal/sh/syscall.s
diff --git a/fusl/src/internal/sh/syscall.s b/fusl/src/internal/sh/syscall.s
new file mode 100644
index 0000000000000000000000000000000000000000..331918a5aaddd0a673606dbb25c2c300d2a83cc7
--- /dev/null
+++ b/fusl/src/internal/sh/syscall.s
@@ -0,0 +1,23 @@
+.global __syscall
+.hidden __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 #31
+ or r0, r0
+ or r0, r0
+ or r0, r0
+ or r0, r0
+ or r0, r0
+ rts
+ nop
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