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      1 # You'll find a bunch of nop opcodes in the below macros.  They are
      2 # there to keep the code correctly aligned.  Be careful to maintain
      3 # them when changing the code.
      4 
      5 	comment "subroutine declare"
      6 	.purgem gdbasm_declare
      7 	.macro gdbasm_declare name
      8 	.align	1
      9 	.global	\name
     10 \name:
     11 	.endm
     12 
     13 	comment "subroutine prologue"
     14 	.macro gdbasm_enter
     15 	mov.l   r14,@-r15
     16 	sts.l   pr,@-r15
     17 	mov     r15,r14
     18 	nop
     19 	.endm
     20 
     21 	comment "subroutine epilogue"
     22 	.macro gdbasm_leave
     23 	mov     r14,r15
     24 	lds.l   @r15+,pr
     25 	mov.l   @r15+,r14
     26 	rts
     27 	nop
     28 	nop
     29 	.endm
     30 
     31 	comment "subroutine end"
     32 	.purgem gdbasm_end
     33 	.macro gdbasm_end name
     34 	.size   \name, . - \name
     35 	.align	1
     36 	.endm
     37 
     38 	comment "subroutine call"
     39 	.macro gdbasm_call subr
     40 	mov.l   .Lconst\@,r1
     41 	bra	.Lafterconst\@
     42 	nop
     43 	nop
     44 .Lconst\@:
     45 	.align	2
     46 	.long	\subr
     47 	.align	1
     48 .Lafterconst\@:
     49 	jsr	@r1
     50 	nop
     51 	.endm
     52 
     53 	.macro gdbasm_several_nops
     54 	nop
     55 	nop
     56 	nop
     57 	nop
     58 	.endm
     59 
     60 	comment "exit (0)"
     61 	.macro gdbasm_exit0
     62 	sleep
     63 	nop
     64 	.endm
     65 
     66 	comment "crt0 startup"
     67 	.macro gdbasm_startup
     68 	comment "If there is a _stack symbol, use it for setting up the stack"
     69 	comment "pointer.  In hosted mode (when there is no _stack symbol),"
     70 	comment "the operating system will have initialized it already."
     71 	mov.l	.stackaddr, r0
     72 	tst	r0, r0
     73 	bt	.afterstackaddr
     74 	mov	r0, r15
     75 	bra	.afterstackaddr
     76 	nop
     77 	.align 2
     78 .stackaddr:
     79 	.weak	_stack
     80 	.long	_stack
     81 	.align	1
     82 .afterstackaddr:
     83 	.endm
     84 
     85 	comment "Declare a data variable"
     86 	.purgem gdbasm_datavar
     87 	.macro gdbasm_datavar name value
     88 	.data
     89 	.align 2
     90 	.type	\name, @object
     91 	.size	\name, 4
     92 \name:
     93 	.long	\value
     94 	.endm
     95