mirror of
https://github.com/libretro/RetroArch.git
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ac119b04f6
- use a custom crt0 to allow overriding __heap_size and __linear_heap_size - add a setting for maximum heap size. unallocated memory can be freely mapped by the core. - add better detection of the extra memory available when running from the HBL.
75 lines
2.3 KiB
ArmAsm
75 lines
2.3 KiB
ArmAsm
@---------------------------------------------------------------------------------
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@ 3DS processor selection
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@---------------------------------------------------------------------------------
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.cpu mpcore
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@---------------------------------------------------------------------------------
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@---------------------------------------------------------------------------------
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.section ".crt0"
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.global _start, __service_ptr, __apt_appid, __heap_size_hbl, __linear_heap_size_hbl, __system_arglist, __system_runflags
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@---------------------------------------------------------------------------------
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.align 2
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.arm
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@---------------------------------------------------------------------------------
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_start:
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@---------------------------------------------------------------------------------
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b startup
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.ascii "_prm"
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__service_ptr:
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.word 0 @ Pointer to service handle override list -- if non-NULL it is assumed that we have been launched from a homebrew launcher
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__apt_appid:
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.word 0x300 @ Program APPID
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__heap_size_hbl:
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.word 24*1024*1024 @ Default heap size (24 MiB)
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__linear_heap_size_hbl:
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.word 32*1024*1024 @ Default linear heap size (32 MiB)
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__system_arglist:
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.word 0 @ Pointer to argument list (argc (u32) followed by that many NULL terminated strings)
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__system_runflags:
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.word 0 @ Flags to signal runtime restrictions to ctrulib
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startup:
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@ Save return address
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mov r4, lr
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@ Clear the BSS section
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ldr r0, =__bss_start__
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ldr r1, =__bss_end__
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sub r1, r1, r0
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bl ClearMem
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@ System initialization
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mov r0, r4
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bl initSystem
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@ Set up argc/argv arguments for main()
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ldr r0, =__system_argc
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ldr r1, =__system_argv
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ldr r0, [r0]
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ldr r1, [r1]
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@ Jump to user code
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ldr r3, =main
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ldr lr, =__ctru_exit
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bx r3
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@---------------------------------------------------------------------------------
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@ Clear memory to 0x00 if length != 0
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@ r0 = Start Address
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@ r1 = Length
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@---------------------------------------------------------------------------------
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ClearMem:
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@---------------------------------------------------------------------------------
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mov r2, #3 @ Round down to nearest word boundary
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add r1, r1, r2 @ Shouldn't be needed
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bics r1, r1, r2 @ Clear 2 LSB (and set Z)
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bxeq lr @ Quit if copy size is 0
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mov r2, #0
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ClrLoop:
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stmia r0!, {r2}
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subs r1, r1, #4
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bne ClrLoop
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bx lr
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