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m68hc11.inc revision 1.5 
      1 	comment "subroutine prologue"
      2 	.macro gdbasm_enter
      3         ldx     _.frame
      4 	pshx
      5 	sts     _.frame
      6 	.endm
      7 
      8 	comment "subroutine epilogue"
      9 	.macro gdbasm_leave
     10         pulx
     11         stx     _.frame
     12 	rts
     13 	.endm
     14 
     15 	.macro gdbasm_call subr
     16 	jsr	\subr
     17 	.endm
     18 
     19 	.macro gdbasm_several_nops
     20 	nop
     21 	nop
     22 	nop
     23 	nop
     24 	.endm
     25 
     26 	comment "exit (0)"
     27 	.macro gdbasm_exit0
     28         clra
     29         clrb
     30         wai
     31 	.endm
     32 
     33 	comment "crt0 startup"
     34 	.macro gdbasm_startup
     35         .sect .data
     36         .globl _.frame
     37 _.frame: .word 0
     38         .previous
     39         lds     #0x2000
     40         ; the linker script maps the data section in ROM (LMA) for its initial
     41         ; content and in RAM (VMA) for its runtime value.  We have to do
     42         ; what the default crt0 does: copy the ROM part in RAM.
     43         ; (otherwise any 'globalvar' appears uninitialized)
     44 	ldx	#__data_image
     45 	ldy	#__data_section_start
     46 	bra	Start_map
     47 Loop:
     48 	ldaa	0,x
     49 	staa	0,y
     50 	inx
     51 	iny
     52 Start_map:
     53 	cpx	#__data_image_end
     54 	blo	Loop
     55 Done:
     56         clr     _.frame
     57         clr     _.frame+1
     58 	.endm
     59 
     60 	comment "Declare a data variable"
     61 	.purgem gdbasm_datavar
     62 	.macro gdbasm_datavar name value
     63 	.data
     64 \name:
     65 	.word	\value
     66 	.endm
     67