diff options
Diffstat (limited to 'asm/rom2.s')
| -rw-r--r-- | asm/rom2.s | 188 |
1 files changed, 87 insertions, 101 deletions
@@ -1,17 +1,94 @@ -.include "asm/macros.inc" - /* rom2.s TODO: Disassemble */ + .include "asm/macros.inc" + + .section .text + + .incbin "baserom.nds", 0xD9150, 0x16AE0 + + arm_func_start _ll_mul +_ll_mul: ; 0x020EBC30 + stmdb sp!, {r4, r5, lr} + umull r5, r4, r0, r2 + mla r4, r0, r3, r4 + mla r4, r2, r1, r4 + mov r1, r4 + mov r0, r5 + ldmia sp!, {r4, r5, lr} + bx lr -.section .text + arm_func_start _ll_shl +_ll_shl: ; 0x020EBC50 + ands r2, r2, #0x3F + bxeq lr + subs r3, r2, #0x20 + bge _020EBC74 + rsb r3, r2, #0x20 + mov r1, r1, lsl r2 + orr r1, r1, r0, lsr r3 + mov r0, r0, lsl r2 + bx lr +_020EBC74: + mov r1, r0, lsl r3 + mov r0, #0x0 + bx lr -.incbin "baserom.nds", 0xD9150, 0x16D3C + arm_func_start _s32_div_f +_s32_div_f: ; 0x20EBC80 + ; Test whether the args have different signs + eor ip, r0, r1 + and ip, ip, #0x80000000 + ; Test the sign of the numerator, and make it positive + cmp r0, #0x0 + rsblt r0, r0, #0x0 + addlt ip, ip, #1 + ; Make the denominator positive, also test for div0 + cmp r1, #0x0 + rsblt r1, r1, #0x0 + beq _020EBE78 + ; If the numerator is less than the denominator, return (0, numerator) + cmp r0, r1 + movcc r1, r0 + movcc r0, #0x0 + bcc _020EBE78 + ; Do the actual division + mov r2, #0x1c + mov r3, r0, lsr #0x4 + cmp r1, r3, lsr #0xc + suble r2, r2, #0x10 + movle r3, r3, lsr #0x10 + cmp r1, r3, lsr #0x4 + suble r2, r2, #0x8 + movle r3, r3, lsr #0x8 + cmp r1, r3 + suble r2, r2, #0x4 + movle r3, r3, lsr #0x4 + mov r0, r0, lsl r2 + rsb r1, r1, #0x0 + adds r0, r0, r0 + add r2, r2, r2, lsl #0x1 + add pc, pc, r2, lsl #0x2 + nop + .rept 32 + adcs r3, r1, r3, lsl #0x1 + subcc r3, r3, r1 + adcs r0, r0, r0 + .endr + mov r1, r3 +_020EBE78: + ; If the signs differed originally, negate quotient + ands r3, ip, #0x80000000 + rsbne r0, r0, #0x0 + ; If the numerator was negative, negate remainder + ands r3, ip, #0x1 + rsbne r1, r1, #0x0 + bx lr ; required to make the linker happy : arm_func_start _u32_div_f _u32_div_f: ; 0x020EBE8C cmp r1, #0x0 - bxeq lr + bxeq lr ; About as wrong as we can be cmp r0, r1 movcc r1, r0 movcc r0, #0x0 @@ -32,111 +109,20 @@ _u32_div_f: ; 0x020EBE8C adds r0, r0, r0 add r2, r2, r2, lsl #0x1 add pc, pc, r2, lsl #0x2 - mov r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 - adcs r3, r1, r3, lsl #0x1 - subcc r3, r3, r1 - adcs r0, r0, r0 + nop + .rept 32 adcs r3, r1, r3, lsl #0x1 subcc r3, r3, r1 adcs r0, r0, r0 + .endr mov r1, r3 bx lr -.incbin "baserom.nds", 0xF0070, 0x55C + .incbin "baserom.nds", 0xF0070, 0x55C .global FUN_020EC5CC FUN_020EC5CC: -.incbin "baserom.nds", 0xF05CC, 0xC8 + .incbin "baserom.nds", 0xF05CC, 0xC8 .global FUN_020EC694 FUN_020EC694: |