50 lines
681 B
PHP
50 lines
681 B
PHP
comment "subroutine prologue"
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.macro gdbasm_enter
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mov.w r6,@-r7
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mov.w r7,r6
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subs #2,r7
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.endm
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comment "subroutine epilogue"
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.macro gdbasm_leave
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adds #2,r7
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mov.w @r7+,r6
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rts
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.endm
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.macro gdbasm_call subr
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jsr @\subr
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.endm
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.macro gdbasm_several_nops
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nop
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nop
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nop
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nop
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.endm
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comment "exit (0)"
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.macro gdbasm_exit0
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mov.w #0xdead,r1
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mov.w #0xbeef,r2
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mov.w #0,r0
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sleep
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.endm
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comment "crt0 startup"
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.macro gdbasm_startup
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.section .stack
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_stack: .long 1
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.section .text
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.global _start
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_start:
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mov.w #0,r6
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mov.w #_stack,sp ; or mov.l #_stack,sp
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mov.w #_edata,r0
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mov.w #_end,r1
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sub.w r2,r2
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.loop: mov.w r2,@r0
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adds #2,r0
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cmp r1,r0
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blo .loop
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.endm
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