76 lines
1.6 KiB
ArmAsm
76 lines
1.6 KiB
ArmAsm
; ARC start up file
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; In the absence of a custom linker script, go with something simple.
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; We do not support passing arguments to "main", but this is an embedded
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; system anyway.
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;
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; We call init/fini here without cpu prefixes because there is always
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; only one .init/.fini section per image.
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.section .text
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.align 4
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.global start
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start:
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mov sp,end ; Round "sp" up to page after "end".
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add sp,sp,4095
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and sp,sp,-4096
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ld r8,[stack_size] ; Add stack size to "sp".
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add sp,sp,r8
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st sp,[sbrk_start] ; Initialize malloc heap.
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st sp,[sbrk_loc]
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sub sp,sp,16 ; callee expects 16 bytes already "pushed".
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mov fp,0 ; Top of stack frame indicator.
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mov r0,edata ; Zero bss.
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mov r2,end
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sub r2,r2,r0
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mov r1,0
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#ifdef __base__
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bl.nd _memset
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bl.nd init ; .init section entry point.
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mov r0,%st(fini) ; .fini section entry point.
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bl.nd _atexit
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mov r0,0 ; argc
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mov r1,0 ; argv
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bl.nd _main
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bl.nd _exit
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#endif
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#ifdef __host__
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bl.nd _host_memset
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bl.nd init ; .init section entry point.
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mov r0,%st(fini) ; .fini section entry point.
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bl.nd _host_atexit
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mov r0,0 ; argc
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mov r1,0 ; argv
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bl.nd _host_main
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bl.nd _host_exit
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#endif
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#ifdef __graphics__
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bl.nd _graphics_memset
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bl.nd init ; .init section entry point.
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mov r0,%st(fini) ; .fini section entry point.
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bl.nd _graphics_atexit
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mov r0,0 ; argc
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mov r1,0 ; argv
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bl.nd _graphics_main
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bl.nd _graphics_exit
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#endif
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#ifdef __audio__
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bl.nd _audio_memset
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bl.nd init ; .init section entry point.
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mov r0,%st(fini) ; .fini section entry point.
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bl.nd _audio_atexit
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mov r0,0 ; argc
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mov r1,0 ; argv
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bl.nd _audio_main
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bl.nd _audio_exit
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#endif
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