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4775fd4a7e
* Rename handwritten asm files and move them to src * Fix progress.py * Remove handling for asm dir from Makefile
64 lines
1.6 KiB
ArmAsm
64 lines
1.6 KiB
ArmAsm
#include "ultra64/asm.h"
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.set noreorder
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.section .text
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.balign 16
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/**
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* void Mio0_Decompress(void* src, void* dst);
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*
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* Decompress Mio0 chunk
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*/
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LEAF(Mio0_Decompress)
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lw $a3, 8($a0) // compressed offset
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lw $t9, 0xC($a0) // uncompressed offset
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lw $t8, 4($a0) // decompressed length
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add $a3, $a3, $a0 // compressed start
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add $t9, $t9, $a0 // uncompressed start
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move $a2, $zero // 0
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addi $a0, $a0, 0x10 // move past header
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add $t8, $t8, $a1 // dst + decompressed length = end
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mainloop:
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bnez $a2, 1f
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nop
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lw $t0, ($a0)
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li $a2, 32
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addi $a0, $a0, 4
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1:
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slt $t1, $t0, $zero
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beqz $t1, read_comp
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nop
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lb $t2, ($t9) // read 1 byte from uncompressed data
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addi $t9, $t9, 1 // advance uncompressed start
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addi $a1, $a1, 1
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b next_iter
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sb $t2, -1($a1) // store uncompressed byte
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read_comp:
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lhu $t2, ($a3) // read 2 bytes from compressed data
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addi $a3, $a3, 2 // advance compressed start
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srl $t3, $t2, 0xC
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andi $t2, $t2, 0xFFF
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beqz $t3, 3f
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sub $t1, $a1, $t2
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addi $t3, $t3, 2
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2:
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lb $t2, -1($t1)
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addi $t3, $t3, -1
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addi $t1, $t1, 1
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addi $a1, $a1, 1
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bnez $t3, 2b
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sb $t2, -1($a1)
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next_iter:
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sll $t0, $t0, 1
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bne $a1, $t8, mainloop // continue until decompressed length is reached
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addi $a2, $a2, -1
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jr $ra
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nop
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3:
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lbu $t3, ($t9)
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addi $t9, $t9, 1
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b 2b
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addi $t3, $t3, 0x12
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END(Mio0_Decompress)
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