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https://opencores.org/ocsvn/openrisc/openrisc/trunk
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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [libgloss/] [xstormy16/] [crt0.s] - Rev 858
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# XSTORMY16 startup code # Interrupt vectors at 0x8000. .section .int_vec,"ax" .global _start .align 1 _start: ;; Reset, watchdog timer interrupt jmpf _int_reset ;; base timer interrupt jmpf _int_basetimer ;; timer 0 jmpf _int_timer0 ;; timer 1 jmpf _int_timer1 ;; SIO0 interrupt jmpf _int_sio0 ;; SIO1 interrupt jmpf _int_sio1 ;; port0 interrupt jmpf _int_port0 ;; port1 interrupt jmpf _int_port1 # Reset code, set up memory and call main. .section .rodata 2: .word __rdata .text _int_reset: ;; Set up the stack pointer. mov r0,#__stack bz r0,#0,0f mov sp,r0 0: ;; Zero the data space mov r0,#_edata mov r1,#_end mov r2,#0 0: mov.w (r0++),r2 blt r0,r1,0b ;; Copy data from ROM into RAM. ROM area may be above 64k, ;; but RAM may not. mov r1,#__data mov r3,#_edata mov r4,#2b mov.w r0,(r4++) mov.w r2,(r4) mov r8,r2 ;; If _data == _rdata there's no need to copy anything. bnz r0,r1,0f bz r2,#0,1f 0: movf.w r2,(r0++) bnz r0,#0,2f add r8,#1 2: mov.w (r1++),r2 blt r1,r3,0b 1: ;; Call hardware init routine callf _hwinit ;; Call initialization routines callf _init ;; Set up fini routines to be called from exit mov r2,#@fptr(_fini) callf atexit ;; Call main() with empty argc/argv/envp mov r2,#0 mov r3,#0 mov r4,#0 callf main ;; Exit. callf exit ;; Should never reach this code. halt 1: .size _int_reset,1b-_int_reset # Stub interrupt routines. .globl _int_timer0 .weak _int_timer0 .globl _int_timer1 .weak _int_timer1 .globl _int_sio0 .weak _int_sio0 .globl _int_sio1 .weak _int_sio1 .globl _int_port0 .weak _int_port0 .globl _int_port1 .weak _int_port1 .globl _int_basetimer .weak _int_basetimer _int_timer0: _int_timer1: _int_sio0: _int_sio1: _int_port0: _int_port1: _int_basetimer: iret 1: .size _int_timer0,1b-_int_timer0 # Stub hardware init .globl _hwinit .weak _hwinit _hwinit: ret 1: .size _int_hwinit,1b-_int_hwinit # The first word in .data has address 0, so it's not a good # idea to use it as its address conflicts with NULL. # Place a HALT instruction there to try to catch NULL pointer # dereferences. .data halt
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