kolibrios/programs/develop/metcc/trunk/libc/start/start.asm

130 lines
3.0 KiB
NASM
Raw Normal View History

format ELF
section '.text' executable
public start
extrn mf_init
extrn main
;include 'debug2.inc'
__DEBUG__=0
virtual at 0
db 'MENUET01' ; 1. Magic number (8 bytes)
dd 0x01 ; 2. Version of executable file
dd 0x0 ; 3. Start address
dd 0x0 ; 4. Size of image
dd 0x100000 ; 5. Size of needed memory
dd 0x100000 ; 6. Pointer to stack
hparams dd 0x0 ; 7. Pointer to program arguments
hpath dd 0x0 ; 8. Pointer to program path
end virtual
start:
;DEBUGF 'Start programm\n'
xor eax,eax
call mf_init
;DEBUGF ' path "%s"\n params "%s"\n', .path, .params
; check for overflow
mov al, [path+buf_len-1]
or al, [params+buf_len-1]
jnz .crash
; check if path written by OS
mov eax, [hparams]
test eax, eax
jz .without_path
mov eax, path
.without_path:
mov esi, eax
call push_param
; retrieving parameters
mov esi, params
xor edx, edx ; dl - <20><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>(1) <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>(0)
; dh - <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> (1 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, 0 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>)
mov ecx, 1 ; cl = 1
; ch = 0 <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>
.parse:
lodsb
test al, al
jz .run
test dl, dl
jnz .findendparam
;{<7B><><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
cmp al, ' '
jz .parse ;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
mov dl, cl ;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
cmp al, '"'
jz @f ;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
mov dh, ch ;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
dec esi
call push_param
inc esi
jmp .parse
@@:
mov dh, cl ;<3B><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
call push_param ;<3B><><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD> <20><> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
jmp .parse ;<3B><><EFBFBD><EFBFBD> <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>}
.findendparam:
test dh, dh
jz @f ; <20><><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
cmp al, '"'
jz .clear
jmp .parse
@@:
cmp al, ' '
jnz .parse
.clear:
lea ebx, [esi - 1]
mov [ebx], ch
mov dl, ch
jmp .parse
.run:
;DEBUGF 'call main(%x, %x) with params:\n', [argc], argv
if __DEBUG__ = 1
mov ecx, [argc]
@@:
lea esi, [ecx * 4 + argv-4]
DEBUGF '0x%x) "%s"\n', cx, [esi]
loop @b
end if
push [argc]
push argv
call main
.exit:
;DEBUGF 'Exit from prog\n';
xor eax,eax
dec eax
int 0x40
dd -1
.crash:
;DEBUGF 'E:buffer overflowed\n'
jmp .exit
;============================
push_param:
;============================
;parameters
; esi - pointer
;description
; procedure increase argc
; and add pointer to array argv
; procedure changes ebx
mov ebx, [argc]
cmp ebx, max_parameters
jae .dont_add
mov [argv+4*ebx], esi
inc [argc]
.dont_add:
ret
;==============================
public params as '__argv'
public path as '__path'
section '.bss'
buf_len = 0x400
max_parameters=0x20
argc rd 1
argv rd max_parameters
path rb buf_len
params rb buf_len
;section '.data'
;include_debug_strings ; ALWAYS present in data section