diff options
Diffstat (limited to 'ROMs/hello_c.asm')
| -rw-r--r-- | ROMs/hello_c.asm | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/ROMs/hello_c.asm b/ROMs/hello_c.asm index e06d4e0..761f32b 100644 --- a/ROMs/hello_c.asm +++ b/ROMs/hello_c.asm @@ -1,17 +1,23 @@ -_main: - ; comment - mov 5, [$51FF] ; int a = 5 + jmp _main +_add_int_a__int_b: ; int add(int a, int b) + pop V0 ; Pop return address to register, to preserve during parameter access + pop [$51FF] ; param int a + pop [$5201] ; param int b + push V0 ; Restore function return address push [$51FF] ; left operand - mov 5, V1 ; right operand + mov [$5201], V1 ; right operand pop V0 ; get left operand back - cmp V0, V1 ; compute equality check - bz LX ; check if condition - not - jmp _end_1 ; if succeeds, continue, else jump to end - mov 99, V0 ; return value + add V0, V1 ; compute addition + mov AX, V0 ; return value ret -_end_1: - mov 0, V0 ; return value + mov 0, V0 ; fallback return 0 + ret + +_main: ; int main() + push 2 ; arg int a + push 1 ; arg int b + call _add_int_a__int_b ; int add(int a, int b) + mov V0, V0 ; return value ret mov 0, V0 ; fallback return 0 ret |