diff options
| -rw-r--r-- | src/bf.s | 6 |
1 files changed, 4 insertions, 2 deletions
@@ -14,7 +14,8 @@ default rel %define SYS_exit 0x3c section .rodata - max_codesize equ 32768 ; must be an integral multiple of the page size + ; max_codesize must be an integral multiple of the page size + max_codesize equ 528 * 4096 error_input_str db "usage: bf file.b", 0x0a error_input_str_len equ $ - error_input_str error_open_failed db "bf: failed to open file", 0x0a @@ -57,7 +58,7 @@ _start: mov rdx, 0x1 ; prot = PROT_READ mov rsi, max_codesize ; length xor rdi, rdi ; addr = 0 - mov rax, SYS_mmap ; no munmap because rbp is used until exit + mov rax, SYS_mmap ; no munmap because the file is used until exit syscall mov rbp, rax ; rbp = instructions @@ -69,6 +70,7 @@ _start: .main_loop: ; switch [instruction] + ; TODO: use a jump table instead .case1: cmp bl, '>' |