(don't drive high byte of address bus for movx @Ri only) */
#define USE_PDATA_PAGING_REGISTER 0
+__sbit __at (0xF7) B_7;
+__sbit __at (0xF6) B_6;
+__sbit __at (0xF5) B_5;
+
/* the return value is expected to be in acc, and not in the standard
* location dpl. Therefore we choose return type void here: */
+#if defined DSDCC_MODEL_HUGE
void
-_gptrget (char *gptr) _naked
+_gptrget (char *gptr) __naked
{
+/* This is the banked version with pointers up to 23 bits.
+ B cannot be trashed */
+
gptr; /* hush the compiler */
- _asm
- ar0 = 0x00
- ; save values passed
+ __asm
;
; depending on the pointer type acc. to SDCCsymt.h
;
- mov a,b
- jz 00001$ ; 0 near
- dec a
- jz 00002$ ; 1 far
- dec a
- jz 00003$ ; 2 code
- dec a
- jz 00004$ ; 3 pdata
- dec a ; 4 skip generic pointer
- dec a
- jz 00001$ ; 5 idata
- ;
- ; any other value for type
- ; return xFF
- mov a,#0xff
- ret
+ jb _B_7,codeptr$ ; >0x80 code ; 3
+ jnb _B_6,xdataptr$ ; <0x40 far ; 3
+
+ mov dph,r0 ; save r0 independant of regbank ; 2
+ mov r0,dpl ; use only low order address ; 2
+
+ jb _B_5,pdataptr$ ; >0x60 pdata ; 3
;
; Pointer to data space
;
- 00001$:
- push ar0
- ;
- mov r0,dpl ; use only low order address
- mov a,@r0
- ;
- pop ar0
- ;
- ret
+ mov a,@r0 ; 1
+ dataptrrestore$:
+ mov r0,dph ; restore r0 ; 2
+ mov dph,#0 ; restore dph ; 2
+ ret ; 1
+ ;
+ ; pointer to external stack or pdata
+ ;
+ pdataptr$:
+ movx a,@r0 ; 1
+ sjmp dataptrrestore$ ; 2
+ ;
+ ; pointer to code area
+ ;
+ codeptr$:
+ ; implementation for SiLabs C8051F12x
+ mov a,b ; 2
+ anl a,#0x03 ; 2
+ swap a ; 1
+ push _PSBANK ; 2
+ anl _PSBANK,#0x0F ; 3
+ orl _PSBANK,a ; 2
+
+ clr a ; 1
+ movc a,@a+dptr ; 1
+ pop _PSBANK ; 2
+ ret ; 1
;
; pointer to xternal data
;
- 00002$:
- movx a,@dptr
- ret
-;
-; pointer to code area
-;
- 00003$:
- ; clr a is already 0
- movc a,@a+dptr
- ret
-;
-; pointer to xternal stack or pdata
-;
- 00004$:
-#if USE_PDATA_PAGING_REGISTER
- mov dph,__XPAGE ; __XPAGE (usually p2) holds high byte for pdata access
- movx a,@dptr
+ xdataptr$:
+ ; implementation for xram a16-a21 tied to P3
+ mov _P3,b ; 3
+
+ movx a,@dptr ; 1
+ ret ; 1
+ ;===
+ ;44 bytes
+ __endasm;
+}
+
+#elif defined DSDCC_MODEL_MEDIUM
+
+void
+_gptrget (char *gptr) __naked
+{
+/* This is the non-banked version with pointers up to 15 bits.
+ Assumes B is free to be used */
+
+ gptr; /* hush the compiler */
+
+ __asm
+ ;
+ ; depending on the pointer type acc. to SDCCsymt.h
+ ;
+ mov b,dph ; 3
+ jb _B_7,codeptr$ ; >0x80 code ; 3
+ jnb _B_6,xdataptr$ ; <0x40 far ; 3
+
+ mov b,r0 ; save r0 independant of regbank ; 2
+ mov r0,dpl ; use only low order address ; 2
+
+ jb _B_5,pdataptr$ ; >0x60 pdata ; 3
+ ;
+ ; Pointer to data space
+ ;
+ mov a,@r0 ; 1
+ mov r0,b ; restore r0 ; 2
+ ret ; 1
+ ;
+ ; pointer to xternal stack or pdata
+ ;
+ pdataptr$:
+ movx a,@r0 ; 1
+ mov r0,b ; restore r0 ; 2
+ ret ; 1
+ ;
+ ; pointer to code area, max 15 bits
+ ;
+ codeptr$:
+ ; 0x8000 <= dptr <= 0xFFFF
+ ; no need to AND dph and restore from B if hardware wraps code memory
+ anl dph,#0x7F ; 3
+ clr a ; 1
+ movc a,@a+dptr ; 1
+ mov dph,b ; 3
+ ret ; 1
+ ;
+ ; pointer to xternal data, max 14 bits
+ ;
+ xdataptr$:
+ ; 0 <= dptr <= 0x3FFF
+ movx a,@dptr ; 1
+ ret ; 1
+ ;===
+ ;35 bytes
+ __endasm;
+}
+
#else
- push ar0
- mov r0,dpl
- movx a,@r0
- pop ar0
-#endif
- ret
- _endasm ;
+
+void
+_gptrget (char *gptr) __naked
+{
+/* This is the new version with pointers up to 16 bits.
+ B cannot be trashed */
+
+ gptr; /* hush the compiler */
+
+ __asm
+ ;
+ ; depending on the pointer type acc. to SDCCsymt.h
+ ;
+ jb _B_7,codeptr$ ; >0x80 code ; 3
+ jnb _B_6,xdataptr$ ; <0x40 far ; 3
+
+ mov dph,r0 ; save r0 independant of regbank ; 2
+ mov r0,dpl ; use only low order address ; 2
+
+ jb _B_5,pdataptr$ ; >0x60 pdata ; 3
+ ;
+ ; Pointer to data space
+ ;
+ mov a,@r0 ; 1
+ dataptrrestore$:
+ mov r0,dph ; restore r0 ; 2
+ mov dph,#0 ; restore dph ; 2
+ ret ; 1
+ ;
+ ; pointer to xternal stack or pdata
+ ;
+ pdataptr$:
+ movx a,@r0 ; 1
+ sjmp dataptrrestore$ ; 2
+ ;
+ ; pointer to code area, max 16 bits
+ ;
+ codeptr$:
+ clr a ; 1
+ movc a,@a+dptr ; 1
+ ret ; 1
+ ;
+ ; pointer to xternal data, max 16 bits
+ ;
+ xdataptr$:
+ movx a,@dptr ; 1
+ ret ; 1
+ ;===
+ ;27 bytes
+ __endasm;
}
+#endif
+
#ifdef SDCC_ds390
/* the return value is expected to be in acc/_ap, and not in the standard
* location dpl/dph. Therefore we choose return type void here: */
+
void
_gptrgetWord (unsigned *gptr)
{
gptr; /* hush the compiler */
- _asm
+ __asm
;
; depending on the pointer type acc. to SDCCsymt.h
;
- mov a,b
- jz 00001$ ; 0 near
- dec a
- jz 00002$ ; 1 far
- dec a
- jz 00003$ ; 2 code
- dec a
- jz 00004$ ; 3 pdata
- dec a ; 4 skip generic pointer
- dec a
- jz 00001$ ; 5 idata
- ;
- ; any other value for type
- ; return xFF
- mov a,#0xff
- sjmp 00006$
+ jb _B_7,00003$ ; >0x80 code
+ jnb _B_6,00002$ ; <0x40 far
+
+ mov dph,r0 ; save r0 independant of regbank
+ mov r0,dpl ; use only low order address
+
+ jb _B_5,00004$ ; >0x60 pdata
;
; Pointer to data space
;
- 00001$:
- push ar0
- mov r0,dpl ; use only low order address
mov _ap,@r0
inc r0
mov a,@r0
; pointer to code area
;
00003$:
- ; clr a is already 0
+ clr a
movc a,@a+dptr
mov _ap,a
clr a
; pointer to xternal stack
;
00004$:
- push ar0
- mov r0,dpl
movx a,@r0
mov _ap,a
inc r0
;
; restore and return
;
-00005$:
- pop ar0
-00006$:
- _endasm ;
+ 00005$:
+ mov r0,dph ; restore r0
+ mov dph,#0 ; restore dph
+ 00006$:
+ xch a,_ap
+ __endasm;
}
+
#endif
projects / fw / sdcc / blobdiff