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problem11.s
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BITS 64
GLOBAL main
EXTERN puts
SECTION .data
array: db 8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 4, 5, 7, 78, 52, 12, 50, 77, 91, 8, 49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 0, 81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65, 52, 70, 95, 23, 4, 60, 11, 42, 69, 24, 68, 56, 1, 32, 56, 71, 37, 2, 36, 91, 22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80, 24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 3, 53, 78, 36, 84, 20, 35, 17, 12, 50, 32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70, 67, 26, 20, 68, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21, 24, 55, 58, 5, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72, 21, 36, 23, 9, 75, 0, 76, 44, 20, 45, 35, 14, 0, 61, 33, 97, 34, 31, 33, 95, 78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 3, 80, 4, 62, 16, 14, 9, 53, 56, 92, 16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 0, 17, 54, 24, 36, 29, 85, 57, 86, 56, 0, 48, 35, 71, 89, 7, 5, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58, 19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4, 89, 55, 40, 4, 52, 8, 83, 97, 35, 99, 16, 7, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66, 88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69, 4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36, 20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36, 16, 20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54, 1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48
string: db 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
SECTION .text
;; int16_t get_pos(int16_t row, int16_t col)
get_pos:
push rbp
mov rbp, rsp
push rbx
push rdx
pushfq
mov rbx, array
mov ax, [rbp + 16]
mov dx, 20
mul dx
mov dx, [rbp + 18]
add ax, dx
movzx rax, ax
add rbx, rax
mov al, [rbx]
movzx rax, al
popfq
pop rdx
pop rbx
pop rbp
ret
;; int16_t get_pos_safe(int16_t row, int16_t col)
;; Returns 0 if out of bounds
get_pos_safe:
push rbp
mov rbp, rsp
pushfq
mov ax, [rbp + 16]
cmp ax, 0
jl _oob
cmp ax, 20
jge _oob
mov ax, [rbp + 18]
cmp ax, 0
jl _oob
cmp ax, 20
jge _oob
mov ax, [rbp + 18]
push ax
mov ax, [rbp + 16]
push ax
call get_pos
add rsp, 4
jmp _safe_rnd
_oob:
mov rax, 0
_safe_rnd:
popfq
pop rbp
ret
;; int64_t do_prod(int16_t x0, int16_t x1, int16_t x2, int16_t x3)
do_prod:
push rbp
mov rbp, rsp
push rdx
pushfq
mov rax, 1
mov rdx, 0
mov dx, [rbp + 16]
mul rdx
mov rdx, 0
mov dx, [rbp + 18]
mul rdx
mov rdx, 0
mov dx, [rbp + 20]
mul rdx
mov rdx, 0
mov dx, [rbp + 22]
mul rdx
popfq
pop rdx
pop rbp
ret
;; int64_t dir_up(int16_t row, int16_t col)
dir_up:
push rbp
mov rbp, rsp
push rbx
push rcx
pushfq
mov bx, [rbp + 16] ; Row
mov cx, [rbp + 18] ; Column
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec bx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec bx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec bx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec bx
call do_prod
add rsp, 8
popfq
pop rcx
pop rbx
pop rbp
ret
;; int64_t dir_left(int16_t row, int16_t col)
dir_left:
push rbp
mov rbp, rsp
push rbx
push rcx
pushfq
mov bx, [rbp + 16] ; Row
mov cx, [rbp + 18] ; Column
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
call do_prod
add rsp, 8
popfq
pop rcx
pop rbx
pop rbp
ret
;; int64_t dir_dia1(int16_t row, int16_t col)
dir_dia1:
push rbp
mov rbp, rsp
push rbx
push rcx
pushfq
mov bx, [rbp + 16] ; Row
mov cx, [rbp + 18] ; Column
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
dec bx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
dec bx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
dec bx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
dec bx
call do_prod
add rsp, 8
popfq
pop rcx
pop rbx
pop rbp
ret
;; int64_t dir_dia2(int16_t row, int16_t col)
dir_dia2:
push rbp
mov rbp, rsp
push rbx
push rcx
pushfq
mov bx, [rbp + 16] ; Row
mov cx, [rbp + 18] ; Column
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
inc bx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
inc bx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
inc bx
push cx
push bx
call get_pos_safe
add rsp, 4
push ax
dec cx
inc bx
call do_prod
add rsp, 8
popfq
pop rcx
pop rbx
pop rbp
ret
;; void ltostr(int64_t x0)
;; Stores result in 'string'
ltostr:
push rbp
mov rbp, rsp
push rax
push rbx
push rcx
push rdx
push rsi
push rdi
pushfq
mov rax, string
mov rdi, rax
mov rsi, rax
mov rax, [rbp + 16]
_lto_loop:
mov rdx, 0
mov rcx, 10
div rcx
;; 0x30 == '0'
add rdx, 0x30
mov [rdi], dl
inc rdi
cmp rax, 0
jnz _lto_loop
mov byte [rdi], 0
;; We want to reverse the string
_lto_rev_loop:
dec rdi
mov al, [rdi]
xchg al, [rsi]
mov [rdi], al
inc rsi
cmp rsi, rdi
jb _lto_rev_loop
popfq
pop rdi
pop rsi
pop rdx
pop rcx
pop rbx
pop rax
pop rbp
ret
;; int64_t max(int64_t n0, int64_t n1)
max:
push rbp
mov rbp, rsp
push rbx
push rcx
pushfq
mov rbx, [rbp + 24]
mov rcx, [rbp + 16]
cmp rbx, rcx
ja _first_g
mov rax, rcx
jmp _second_g
_first_g:
mov rax, rbx
_second_g:
popfq
pop rcx
pop rbx
pop rbp
ret
main:
push rbp
mov rbp, rsp
mov rax, 0
mov rbx, 0
mov cx, 0
mov dx, 0
_outer_loop:
mov dx, 0
_inner_loop:
push cx
push dx
call dir_up
add rsp, 4
push rax
push rbx
call max
add rsp, 16
mov rbx, rax
push cx
push dx
call dir_left
add rsp, 4
push rax
push rbx
call max
add rsp, 16
mov rbx, rax
push cx
push dx
call dir_dia1
add rsp, 4
push rax
push rbx
call max
add rsp, 16
mov rbx, rax
push cx
push dx
call dir_dia2
add rsp, 4
push rax
push rbx
call max
add rsp, 16
mov rbx, rax
inc dx
cmp dx, 20
jb _inner_loop
inc cx
cmp cx, 20
jb _outer_loop
push rax
call ltostr
pop rax
mov rcx, string
call puts
pop rbp
ret