mirror of
https://github.com/libretro/RetroArch.git
synced 2024-11-24 00:20:01 +00:00
75 lines
2.3 KiB
ArmAsm
75 lines
2.3 KiB
ArmAsm
@---------------------------------------------------------------------------------
|
|
@ 3DS processor selection
|
|
@---------------------------------------------------------------------------------
|
|
.cpu mpcore
|
|
@---------------------------------------------------------------------------------
|
|
|
|
@---------------------------------------------------------------------------------
|
|
.section ".crt0"
|
|
.global _start, __service_ptr, __apt_appid, __heap_size_hbl, __linear_heap_size_hbl, __system_arglist, __system_runflags
|
|
@---------------------------------------------------------------------------------
|
|
.align 2
|
|
.arm
|
|
@---------------------------------------------------------------------------------
|
|
_start:
|
|
@---------------------------------------------------------------------------------
|
|
b startup
|
|
.ascii "_prm"
|
|
__service_ptr:
|
|
.word 0 @ Pointer to service handle override list -- if non-NULL it is assumed that we have been launched from a homebrew launcher
|
|
__apt_appid:
|
|
.word 0x300 @ Program APPID
|
|
__heap_size_hbl:
|
|
.word 24*1024*1024 @ Default heap size (24 MiB)
|
|
__linear_heap_size_hbl:
|
|
.word 32*1024*1024 @ Default linear heap size (32 MiB)
|
|
__system_arglist:
|
|
.word 0 @ Pointer to argument list (argc (u32) followed by that many NULL terminated strings)
|
|
__system_runflags:
|
|
.word 0 @ Flags to signal runtime restrictions to ctrulib
|
|
startup:
|
|
@ Save return address
|
|
mov r4, lr
|
|
bics sp, sp, #7
|
|
|
|
@ Clear the BSS section
|
|
ldr r0, =__bss_start__
|
|
ldr r1, =__bss_end__
|
|
sub r1, r1, r0
|
|
bl ClearMem
|
|
|
|
@ System initialization
|
|
mov r0, r4
|
|
bl initSystem
|
|
|
|
@ Set up argc/argv arguments for main()
|
|
ldr r0, =__system_argc
|
|
ldr r1, =__system_argv
|
|
ldr r0, [r0]
|
|
ldr r1, [r1]
|
|
|
|
@ Jump to user code
|
|
ldr r3, =main
|
|
ldr lr, =__ctru_exit
|
|
bx r3
|
|
|
|
@---------------------------------------------------------------------------------
|
|
@ Clear memory to 0x00 if length != 0
|
|
@ r0 = Start Address
|
|
@ r1 = Length
|
|
@---------------------------------------------------------------------------------
|
|
ClearMem:
|
|
@---------------------------------------------------------------------------------
|
|
mov r2, #3 @ Round down to nearest word boundary
|
|
add r1, r1, r2 @ Shouldn't be needed
|
|
bics r1, r1, r2 @ Clear 2 LSB (and set Z)
|
|
bxeq lr @ Quit if copy size is 0
|
|
|
|
mov r2, #0
|
|
ClrLoop:
|
|
stmia r0!, {r2}
|
|
subs r1, r1, #4
|
|
bne ClrLoop
|
|
|
|
bx lr
|