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