Compile agbabi into agb

This commit is contained in:
Gwilym Kuiper 2022-06-17 00:29:01 +01:00
parent 149d2ec76b
commit 601360ca67
3 changed files with 229 additions and 1 deletions

View file

@ -1,7 +1,13 @@
use std::path;
fn main() {
let asm = &["crt0.s", "interrupt_handler.s", "src/sound/mixer/mixer.s"];
let asm = &[
"crt0.s",
"interrupt_handler.s",
"src/sound/mixer/mixer.s",
"src/agbabi/memset.s",
"src/agbabi/memcpy.s",
];
println!("cargo:rerun-if-changed=gba.ld");
println!("cargo:rerun-if-changed=gba_mb.ld");

115
agb/src/agbabi/memcpy.s Normal file
View file

@ -0,0 +1,115 @@
/*
===============================================================================
ABI:
__aeabi_memcpy, __aeabi_memcpy4, __aeabi_memcpy8
Standard:
memcpy
Support:
__agbabi_memcpy2
Copyright (C) 2021-2022 agbabi contributors
For conditions of distribution and use, see copyright notice in LICENSE.md
===============================================================================
*/
.arm
.align 4
.section .iwram.__aeabi_memcpy, "ax", %progbits
.global __agbabi_memcpy
__agbabi_memcpy:
.global __aeabi_memcpy
__aeabi_memcpy:
// Check pointer alignment
eor r3, r1, r0
// JoaoBapt carry & sign bit test
movs r3, r3, lsl #31
bmi .Lcopy1
bcs .Lcopy2
.Lcopy4:
// Copy half and byte head
rsb r3, r0, #4
movs r3, r3, lsl #31
ldrmib r3, [r1], #1
strmib r3, [r0], #1
submi r2, r2, #1
ldrcsh r3, [r1], #2
strcsh r3, [r0], #2
subcs r2, r2, #2
// Fallthrough
.global __aeabi_memcpy8
__aeabi_memcpy8:
.global __aeabi_memcpy4
__aeabi_memcpy4:
// Copy 8 words
movs r12, r2, lsr #5
beq .Lskip32
lsl r3, r12, #5
sub r2, r2, r3
push {r4-r10}
.LcopyWords8:
ldmia r1!, {r3-r10}
stmia r0!, {r3-r10}
subs r12, r12, #1
bne .LcopyWords8
pop {r4-r10}
.Lskip32:
// Copy words
movs r12, r2, lsr #2
.LcopyWords:
subs r12, r12, #1
ldrhs r3, [r1], #4
strhs r3, [r0], #4
bhs .LcopyWords
// Copy half and byte tail
movs r3, r2, lsl #31
ldrcsh r3, [r1], #2
strcsh r3, [r0], #2
ldrmib r3, [r1]
strmib r3, [r0]
bx lr
.Lcopy2:
// Copy byte head
tst r0, #1
ldrneb r3, [r1], #1
strneb r3, [r0], #1
subne r2, r2, #1
// Fallthrough
.global __agbabi_memcpy2
__agbabi_memcpy2:
// Copy halves
movs r12, r2, lsr #1
.LcopyHalves:
subs r12, r12, #1
ldrhsh r3, [r1], #2
strhsh r3, [r0], #2
bhs .LcopyHalves
// Copy byte tail
tst r2, #1
ldrneb r3, [r1]
strneb r3, [r0]
bx lr
.Lcopy1:
subs r2, r2, #1
ldrhsb r3, [r1], #1
strhsb r3, [r0], #1
bhs .Lcopy1
bx lr
.section .iwram.memcpy, "ax", %progbits
.global memcpy
memcpy:
push {r0, lr}
bl __aeabi_memcpy
pop {r0, lr}
bx lr

107
agb/src/agbabi/memset.s Normal file
View file

@ -0,0 +1,107 @@
/*
===============================================================================
ABI:
__aeabi_memset, __aeabi_memset4, __aeabi_memset8,
__aeabi_memclr, __aeabi_memclr4, __aeabi_memclr8
Standard:
memset
Support:
__agbabi_wordset4
Copyright (C) 2021-2022 agbabi contributors
For conditions of distribution and use, see copyright notice in LICENSE.md
===============================================================================
*/
.arm
.balign 4
.section .iwram.__aeabi_memset, "ax", %progbits
.global __agbabi_memset
__agbabi_memset:
.global __aeabi_memclr
__aeabi_memclr:
mov r2, #0
b .LskipShifts
.global __aeabi_memset
__aeabi_memset:
mov r2, r2, lsl #24
orr r2, r2, r2, lsr #8
orr r2, r2, r2, lsr #16
// Fallthrough
.LskipShifts:
// JoaoBapt carry & sign bit test
rsb r3, r0, #4
movs r3, r3, lsl #31
// Set half and byte head
strmib r2, [r0], #1
submi r1, r1, #1
strcsh r2, [r0], #2
subcs r1, r1, #2
b __agbabi_wordset4
.global __aeabi_memclr8
__aeabi_memclr8:
.global __aeabi_memclr4
__aeabi_memclr4:
mov r2, #0
b __agbabi_wordset4
.global __aeabi_memset8
__aeabi_memset8:
.global __aeabi_memset4
__aeabi_memset4:
mov r2, r2, lsl #24
orr r2, r2, r2, lsr #8
orr r2, r2, r2, lsr #16
// Fallthrough
.global __agbabi_wordset4
__agbabi_wordset4:
// Set 8 words
movs r12, r1, lsr #5
beq .Lskip32
lsl r3, r12, #5
sub r1, r1, r3
push {r4-r9}
mov r3, r2
mov r4, r2
mov r5, r2
mov r6, r2
mov r7, r2
mov r8, r2
mov r9, r2
.LsetWords8:
stmia r0!, {r2-r9}
subs r12, r12, #1
bne .LsetWords8
pop {r4-r9}
.Lskip32:
// Set words
movs r12, r1, lsr #2
.LsetWords:
subs r12, r12, #1
strhs r2, [r0], #4
bhs .LsetWords
// Set half and byte tail
movs r3, r1, lsl #31
strcsh r2, [r0], #2
strmib r2, [r0]
bx lr
.section .iwram.memset, "ax", %progbits
.global memset
memset:
mov r3, r1
mov r1, r2
mov r2, r3
push {r0, lr}
bl __aeabi_memset
pop {r0, lr}
bx lr