diff options
Diffstat (limited to 'sh.asm')
| -rw-r--r-- | sh.asm | 18 |
1 files changed, 16 insertions, 2 deletions
@@ -28,6 +28,7 @@ section .data sys_exit equ 0x3c sys_wait4 equ 0x3d sys_kill equ 0x3e + sys_chdir equ 0x50 sys_waitid equ 0xf7 @@ -262,10 +263,15 @@ _parse3: je _parse4 ;r15 holds the name that the user entered, so we'll use that for shell builtins mov rcx,`\0\0\0exit\0` - mov r13, [r15] ; Add exit codes later - shl r13, 24 ;Remove the last character + mov r13, [r15] + shl r13, 24 ;Remove the last character, because it's an arg not the name of it cmp r13, rcx je _builtin_exit + mov rcx,`\0\0\0\0\0cd\0` + shl r13, 16 ;Remove the extra characters for cd, note how we're doing the + ;longest function names first then the shorter later + cmp r13, rcx + je _builtin_cd ;END OF BUILTINS mov r13, r15 mov rcx, [r9+r8*8] @@ -425,6 +431,14 @@ _quit: xor rdi, rdi syscall +;cd [dir] +;changes to the given directory +_builtin_cd: + ;stub atm + mov rdi,rax + mov rax, sys_chdir + syscall + jmp _read_loop ;usage: exit [status] ;exits with the given status or 0 if one hasn't been provided _builtin_exit: |