mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-12-18 16:32:05 +00:00
132 lines
2.4 KiB
ArmAsm
132 lines
2.4 KiB
ArmAsm
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/**
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* @file start.s
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* @copyright libnx Authors
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*/
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.macro push_all
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SUB SP, SP, #0x100
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STP X29, X30, [SP, #0x0]
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STP X27, X28, [SP, #0x10]
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STP X25, X26, [SP, #0x20]
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STP X23, X24, [SP, #0x30]
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STP X21, X22, [SP, #0x40]
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STP X19, X20, [SP, #0x50]
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STP X17, X18, [SP, #0x60]
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STP X15, X16, [SP, #0x70]
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STP X13, X14, [SP, #0x80]
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STP X11, X12, [SP, #0x90]
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STP X9, X10, [SP, #0xA0]
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STP X7, X8, [SP, #0xB0]
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STP X5, X6, [SP, #0xC0]
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STP X3, X4, [SP, #0xD0]
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STP X1, X2, [SP, #0xE0]
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STR X0, [SP, #0xF0]
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.endm
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.macro pop_all
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LDR X0, [SP, #0xF0]
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LDP X1, X2, [SP, #0xE0]
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LDP X3, X4, [SP, #0xD0]
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LDP X5, X6, [SP, #0xC0]
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LDP X7, X8, [SP, #0xB0]
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LDP X9, X10, [SP, #0xA0]
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LDP X11, X12, [SP, #0x90]
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LDP X13, X14, [SP, #0x80]
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LDP X15, X16, [SP, #0x70]
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LDP X17, X18, [SP, #0x60]
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LDP X19, X20, [SP, #0x50]
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LDP X21, X22, [SP, #0x40]
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LDP X23, X24, [SP, #0x30]
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LDP X25, X26, [SP, #0x20]
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LDP X27, X28, [SP, #0x10]
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LDP X29, X30, [SP, #0x0]
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ADD SP, SP, #0x100
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.endm
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.section ".crt0","ax"
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.global _start
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_start:
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B startup
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.org _start+0xc
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B sdmmc_wrapper_read
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.org _start+0x18
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B sdmmc_wrapper_write
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.org _start+0x80
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.section ".crt0","ax"
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startup:
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# Save LR
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MOV X7, X30
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# Retrieve ASLR Base
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BL +4
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SUB X6, X30, #0x88
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# Context Ptr and MainThread Handle
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MOV X5, X0
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MOV X4, X1
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# Inject start
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push_all
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MOV W0, #0xFFFF8001
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ADR X1, __rodata_start
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ADR X2, __data_start
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SUB X2, X2, X1
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MOV X3, #1
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SVC 0x73
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MOV W0, #0xFFFF8001
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ADR X1, __data_start
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ADR X2, __argdata__
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SUB X2, X2, X1
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MOV X3, #3
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SVC 0x73
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pop_all
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MOV X27, X7
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MOV X25, X5
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MOV X26, X4
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# Clear .bss
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ADRP X0, __bss_start__
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ADRP X1, __bss_end__
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ADD X0, X0, #:lo12:__bss_start__
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ADD X1, X1, #:lo12:__bss_end__
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SUB X1, X1, X0
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ADD X1, X1, #7
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BIC X1, X1, #7
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bss_loop:
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STR XZR, [X0], #8
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SUBS X1, X1, #8
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BNE bss_loop
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# Store SP
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MOV X1, SP
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ADRP X0, __stack_top
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STR X1, [X0, #:lo12:__stack_top]
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# Process _DYNAMIC Section
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MOV X0, X6
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ADRP X1, _DYNAMIC
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ADD X1, X1, #:lo12:_DYNAMIC
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BL __nx_dynamic
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# TODO: handle in code
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MOV X0, X25
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MOV X1, X26
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MOV X2, X27
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BL __initheap
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BL __init
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MOV X0, X25
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MOV X1, X26
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MOV X30, X27
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# FS main
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ADRP X16, __argdata__
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BR X16
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