Allow `builtins.c` to inject constants into program, use for syscalls

We can now directly expose the `syscallN()` APIs to the program and
define the `open()`, `write()` etc syscalls in the stdlib. This
simplifies the implementation a decent bunch :^)

1 files changed, 9 insertions, 0 deletions

diff --git a/src/utils.c b/src/utils.c
index 939021a..050c654 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -29,6 +29,15 @@ void _die_location(char *file, int line, Location loc, const char *fmt, ...)
 i64 i64max(i64 a, i64 b) { return a > b ? a : b; }
 i64 i64min(i64 a, i64 b) { return a < b ? a : b; }
 
+
+i64 get_syscall_num(i64 orig_syscall) {
+#if __APPLE__
+    return orig_syscall + 0x2000000;
+#else
+    return orig_syscall;
+#endif
+}
+
 i64 align_up(i64 val, i64 align)
 {
     return (val + align - 1) & ~(align - 1);