1 /*-------------------------------------------------------------------------
3 main.c - pic16 specific general functions.
5 Written by - Scott Dattalo scott@dattalo.com
6 Ported to PIC16 by - Martin Dubuc m.debuc@rogers.com
8 Note that mlh prepended _pic16_ on the static functions. Makes
9 it easier to set a breakpoint using the debugger.
12 This program is free software; you can redistribute it and/or modify it
13 under the terms of the GNU General Public License as published by the
14 Free Software Foundation; either version 2, or (at your option) any
17 This program is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
22 You should have received a copy of the GNU General Public License
23 along with this program; if not, write to the Free Software
24 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25 -------------------------------------------------------------------------*/
37 static char _defaultRules[] =
42 /* list of key words used by pic16 */
43 static char *_pic16_keywords[] =
72 pic16_sectioninfo_t pic16_sectioninfo;
75 extern char *pic16_processor_base_name(void);
77 void pic16_pCodeInitRegisters(void);
79 void pic16_assignRegisters (eBBlock ** ebbs, int count);
81 static int regParmFlg = 0; /* determine if we can register a parameter */
83 pic16_options_t pic16_options;
85 extern set *includeDirsSet;
86 extern set *dataDirsSet;
87 extern set *libFilesSet;
89 /* Also defined in gen.h, but the #include is commented out */
90 /* for an unknowned reason. - EEP */
91 void pic16_emitDebuggerSymbol (char *);
93 extern regs* newReg(short type, short pc_type, int rIdx, char *name, int size, int alias, operand *refop);
94 extern void pic16_emitConfigRegs(FILE *of);
102 asm_addTree (&asm_asxxxx_mapping);
103 pic16_pCodeInitRegisters();
106 /* set pic16 port options to defaults */
107 pic16_options.no_banksel = 0;
108 pic16_options.opt_banksel = 0;
109 pic16_options.omit_configw = 0;
110 pic16_options.omit_ivt = 0;
111 pic16_options.leave_reset = 0;
112 pic16_options.stack_model = 0; /* 0 for 'small', 1 for 'large' */
116 _pic16_reset_regparm ()
122 _pic16_regparm (sym_link * l)
124 /* for this processor it is simple
125 can pass only the first parameter in a register */
134 int initsfpnt=0; /* set to 1 if source provides a pragma for stack
135 * so glue() later emits code to initialize stack/frame pointers */
139 _process_pragma(const char *sz)
141 static const char *WHITE = " \t";
143 char *ptr = strtok((char *)sz, WHITE);
145 if (startsWith (ptr, "maxram")) {
146 char *maxRAM = strtok((char *)NULL, WHITE);
148 if (maxRAM != (char *)NULL) {
152 maxRAMVal = constVal(maxRAM);
153 maxRAMaddress = (int)floatFromVal(maxRAMVal);
154 pic16_setMaxRAM(maxRAMaddress);
158 if(startsWith(ptr, "stack")) {
159 char *stackPosS = strtok((char *)NULL, WHITE);
163 // fprintf(stderr, "Initializing stack pointer to 0x%x\n", (int)floatFromVal(constVal(stackPos)));
164 stackPosVal = constVal( stackPosS );
165 stackPos = (unsigned int)floatFromVal( stackPosVal );
167 reg=newReg(REG_SFR, PO_SFR_REGISTER, stackPos, "stack", 1, 0, NULL);
168 addSet(&pic16_fix_udata, reg);
170 initsfpnt = 1; // force glue() to initialize stack/frame pointers */
175 if(startsWith(ptr, "code")) {
176 char *symname = strtok((char *)NULL, WHITE);
177 char *location = strtok((char *)NULL, WHITE);
181 absS = Safe_calloc(1, sizeof(absSym));
182 absS->name = Safe_strdup( symname );
183 addr = constVal( location );
184 absS->address = (unsigned int)floatFromVal( addr );
186 addSet(&absSymSet, absS);
187 fprintf(stderr, "%s:%d symbol %s will be placed in location 0x%06x in code memory\n",
188 __FILE__, __LINE__, symname, absS->address);
196 #define REP_UDATA "--preplace-udata-with="
198 #define STACK_MODEL "--pstack-model="
199 #define OPT_BANKSEL "--obanksel="
201 #define ALT_ASM "--asm="
202 #define ALT_LINK "--link="
207 extern int pic16_debug_verbose;
208 extern int pic16_ralloc_debug;
209 extern int pic16_pcode_verbose;
211 int pic16_enable_peeps=0;
213 OPTION pic16_optionsTable[]= {
214 { 0, "--pno-banksel", &pic16_options.no_banksel, "do not generate BANKSEL assembler directives"},
215 { 0, OPT_BANKSEL, NULL, "set banksel optimization level (default=0 no)"},
216 { 0, "--pomit-config-words", &pic16_options.omit_configw, "omit the generation of configuration words"},
217 { 0, "--pomit-ivt", &pic16_options.omit_ivt, "omit the generation of the Interrupt Vector Table"},
218 { 0, "--pleave-reset-vector",&pic16_options.leave_reset, "when omitting IVT leave RESET vector"},
219 { 0, STACK_MODEL, NULL, "use stack model 'small' (default) or 'large'"},
221 { 0, "--debug-xtra", &pic16_debug_verbose, "show more debug info in assembly output"},
222 { 0, "--debug-ralloc", &pic16_ralloc_debug, "dump register allocator debug file *.d"},
223 { 0, "--pcode-verbose", &pic16_pcode_verbose, "dump pcode related info"},
225 { 0, REP_UDATA, NULL, "Place udata variables at another section: udata_acs, udata_ovr, udata_shr"},
227 { 0, ALT_ASM, NULL, "Use alternative assembler"},
228 { 0, ALT_LINK, NULL, "Use alternative linker"},
230 { 0, "--denable-peeps", &pic16_enable_peeps, "explicit enable of peepholes"},
232 { 0, NULL, NULL, NULL}
236 #define ISOPT(str) !strncmp(argv[ *i ], str, strlen(str) )
238 extern char *getStringArg(const char *, char **, int *, int);
239 extern int getIntArg(const char *, char **, int *, int);
242 _pic16_parseOptions (int *pargc, char **argv, int *i)
247 /* TODO: allow port-specific command line options to specify
248 * segment names here.
250 /* check for arguments that have associated an integer variable */
251 while(pic16_optionsTable[j].pparameter) {
252 if(ISOPT( pic16_optionsTable[j].longOpt )) {
253 (*pic16_optionsTable[j].pparameter)++;
260 if(ISOPT(STACK_MODEL)) {
261 stkmodel = getStringArg(STACK_MODEL, argv, i, *pargc);
262 if(STRCASECMP(stkmodel, "small"))pic16_options.stack_model = 0;
263 else if(STRCASECMP(stkmodel, "large"))pic16_options.stack_model = 1;
265 fprintf(stderr, "Unknown stack model: %s", stkmodel);
271 if(ISOPT(OPT_BANKSEL)) {
272 pic16_options.opt_banksel = getIntArg(OPT_BANKSEL, argv, i, *pargc);
276 if(ISOPT(REP_UDATA)) {
277 pic16_sectioninfo.at_udata = Safe_strdup(getStringArg(REP_UDATA, argv, i, *pargc));
282 alt_asm = Safe_strdup(getStringArg(ALT_ASM, argv, i, *pargc));
286 if(ISOPT(ALT_LINK)) {
287 alt_link = Safe_strdup(getStringArg(ALT_LINK, argv, i, *pargc));
295 static void _pic16_initPaths(void)
297 char pic16incDir[512];
298 char pic16libDir[512];
299 set *pic16incDirsSet;
300 set *pic16libDirsSet;
303 setMainValue("mcu", pic16->name[2] );
304 addSet(&preArgvSet, Safe_strdup("-D{mcu}"));
306 sprintf(pic16incDir, "%s%cpic16", INCLUDE_DIR_SUFFIX, DIR_SEPARATOR_CHAR);
307 sprintf(pic16libDir, "%s%cpic16", LIB_DIR_SUFFIX, DIR_SEPARATOR_CHAR);
309 if(!options.nostdinc) {
310 /* setup pic16 include directory */
311 pic16incDirsSet = appendStrSet(dataDirsSet, NULL, pic16incDir);
312 mergeSets(&includeDirsSet, pic16incDirsSet);
315 if(!options.nostdlib) {
316 /* setup pic16 library directory */
317 pic16libDirsSet = appendStrSet(dataDirsSet, NULL, pic16libDir);
318 mergeSets(&libDirsSet, pic16libDirsSet);
320 /* now add the library for the device */
321 sprintf(devlib, "%s.lib", pic16->name[2]);
322 addSet(&libFilesSet, Safe_strdup(devlib));
327 /* forward declarations */
328 extern const char *pic16_linkCmd[];
329 extern const char *pic16_asmCmd[];
332 _pic16_finaliseOptions (void)
334 port->mem.default_local_map = data;
335 port->mem.default_globl_map = data;
337 /* peepholes are disabled for the time being */
340 /* explicit enable peepholes for testing */
341 if(pic16_enable_peeps)
344 options.all_callee_saves = 1; // always callee saves
345 // options.float_rent = 1;
346 // options.intlong_rent = 1;
349 if(alt_asm && strlen(alt_asm))
350 pic16_asmCmd[0] = alt_asm;
352 if(alt_link && strlen(alt_link))
353 pic16_linkCmd[0] = alt_link;
357 /* all the rest is commented ifdef'd out */
359 /* Hack-o-matic: if we are using the flat24 model,
360 * adjust pointer sizes.
362 if (options.model == MODEL_FLAT24)
365 fprintf (stderr, "*** WARNING: you should use the '-mds390' option "
366 "for DS80C390 support. This code generator is "
367 "badly out of date and probably broken.\n");
369 port->s.fptr_size = 3;
370 port->s.gptr_size = 4;
371 port->stack.isr_overhead++; /* Will save dpx on ISR entry. */
373 port->stack.call_overhead++; /* This acounts for the extra byte
374 * of return addres on the stack.
375 * but is ugly. There must be a
379 fReturn = fReturn390;
383 if (options.model == MODEL_LARGE)
385 port->mem.default_local_map = xdata;
386 port->mem.default_globl_map = xdata;
390 port->mem.default_local_map = data;
391 port->mem.default_globl_map = data;
394 if (options.stack10bit)
396 if (options.model != MODEL_FLAT24)
399 "*** warning: 10 bit stack mode is only supported in flat24 model.\n");
400 fprintf (stderr, "\t10 bit stack mode disabled.\n");
401 options.stack10bit = 0;
405 /* Fixup the memory map for the stack; it is now in
406 * far space and requires a FPOINTER to access it.
409 istack->ptrType = FPOINTER;
416 _pic16_setDefaultOptions (void)
418 /* initialize to defaults section locations, names and addresses */
419 pic16_sectioninfo.at_udata = "udata";
421 /* set pic16 port options to defaults */
422 pic16_options.no_banksel = 0;
423 pic16_options.opt_banksel = 0;
424 pic16_options.omit_configw = 0;
425 pic16_options.omit_ivt = 0;
426 pic16_options.leave_reset = 0;
427 pic16_options.stack_model = 0; /* 0 for 'small', 1 for 'large' */
431 _pic16_getRegName (struct regs *reg)
440 static char *_pic16_mangleFunctionName(char *sz)
442 // fprintf(stderr, "mangled function name: %s\n", sz);
450 _pic16_genAssemblerPreamble (FILE * of)
452 char *name = pic16_processor_base_name();
456 fprintf(stderr,"WARNING: No Pic has been selected, defaulting to %s\n",name);
459 fprintf (of, "\tlist\tp=%s\n",&name[1]);
461 if(!pic16_options.omit_configw) {
462 pic16_emitConfigRegs(of);
464 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x300001, pic16_getConfigWord(0x300001));
465 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x300002, pic16_getConfigWord(0x300002));
466 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x300003, pic16_getConfigWord(0x300003));
467 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x300005, pic16_getConfigWord(0x300005));
468 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x300006, pic16_getConfigWord(0x300006));
469 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x300008, pic16_getConfigWord(0x300008));
470 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x300009, pic16_getConfigWord(0x300009));
471 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x30000a, pic16_getConfigWord(0x30000a));
472 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x30000b, pic16_getConfigWord(0x30000b));
473 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x30000c, pic16_getConfigWord(0x30000c));
474 fprintf (of, "\t__config 0x%x,0x%hhx\n", 0x30000d, pic16_getConfigWord(0x30000d));
478 fprintf (of, "\tradix dec\n");
481 /* Generate interrupt vector table. */
483 _pic16_genIVT (FILE * of, symbol ** interrupts, int maxInterrupts)
486 /* PIC18F family has only two interrupts, the high and the low
487 * priority interrupts, which reside at 0x0008 and 0x0018 respectively - VR */
489 if((!pic16_options.omit_ivt) || (pic16_options.omit_ivt && pic16_options.leave_reset)) {
490 fprintf(of, "; RESET vector\n");
491 fprintf(of, "\tgoto\t__sdcc_gsinit_startup\n");
494 if(!pic16_options.omit_ivt) {
495 fprintf(of, "\tres 4\n");
498 fprintf(of, "; High priority interrupt vector 0x0008\n");
500 fprintf(of, "\tgoto\t%s\n", interrupts[1]->rname);
501 fprintf(of, "\tres\t12\n");
503 fprintf(of, "\tretfie\n");
504 fprintf(of, "\tres\t14\n");
507 fprintf(of, "; Low priority interrupt vector 0x0018\n");
509 fprintf(of, "\tgoto\t%s\n", interrupts[2]->rname);
511 fprintf(of, "\tretfie\n");
518 /* return True if the port can handle the type,
519 * False to convert it to function call */
520 static bool _hasNativeMulFor (iCode *ic, sym_link *left, sym_link *right)
522 // fprintf(stderr,"checking for native mult for %c (size: %d)\n", ic->op, getSize(OP_SYMBOL(IC_RESULT(ic))->type));
525 /* multiplication is fixed */
526 /* support mul for char/int/long */
527 if((getSize(OP_SYMBOL(IC_LEFT(ic))->type ) <= 4)
528 && (ic->op == '*'))return TRUE;
532 /* support div for char/int/long */
533 if((getSize(OP_SYMBOL(IC_LEFT(ic))->type ) <= 0)
534 && (ic->op == '/'))return TRUE;
542 /* Do CSE estimation */
543 static bool cseCostEstimation (iCode *ic, iCode *pdic)
545 // operand *result = IC_RESULT(ic);
546 // sym_link *result_type = operandType(result);
549 /* VR -- this is an adhoc. Put here after conversation
550 * with Erik Epetrich */
554 || ic->op == EQ_OP) {
556 fprintf(stderr, "%d %s\n", __LINE__, __FUNCTION__);
561 /* if it is a pointer then return ok for now */
562 if (IC_RESULT(ic) && IS_PTR(result_type)) return 1;
564 /* if bitwise | add & subtract then no since mcs51 is pretty good at it
565 so we will cse only if they are local (i.e. both ic & pdic belong to
566 the same basic block */
567 if (IS_BITWISE_OP(ic) || ic->op == '+' || ic->op == '-') {
568 /* then if they are the same Basic block then ok */
569 if (ic->eBBlockNum == pdic->eBBlockNum) return 1;
574 /* for others it is cheaper to do the cse */
580 /* Indicate which extended bit operations this port supports */
582 hasExtBitOp (int op, int size)
586 /* || op == GETHBIT */ /* GETHBIT doesn't look complete for PIC */
593 /* Indicate the expense of an access to an output storage class */
595 oclsExpense (struct memmap *oclass)
597 /* The IN_FARSPACE test is compatible with historical behaviour, */
598 /* but I don't think it is applicable to PIC. If so, please feel */
599 /* free to remove this test -- EEP */
600 if (IN_FARSPACE(oclass))
606 /** $1 is always the basename.
607 $2 is always the output file.
608 $3 -L path and -l libraries
609 $l is the list of extra options that should be there somewhere...
610 MUST be terminated with a NULL.
612 const char *pic16_linkCmd[] =
614 "gplink", "$3", "\"$1.o\"", "-o \"$2\"", "$l", NULL
619 /** $1 is always the basename.
620 $2 is always the output file.
621 $3 varies (nothing currently)
622 $l is the list of extra options that should be there somewhere...
623 MUST be terminated with a NULL.
625 const char *pic16_asmCmd[] =
627 "gpasm", "$l", "$3", "-c", "\"$1.asm\"", "-o \"$2\"", NULL
636 "MCU PIC16", /* Target name */
637 "p18f452", /* Processor */
640 TRUE, /* Emit glue around main */
641 MODEL_SMALL | MODEL_LARGE | MODEL_FLAT24,
645 pic16_asmCmd, /* assembler command and arguments */
646 NULL, /* alternate macro based form */
647 "-g", /* arguments for debug mode */
648 NULL, /* arguments for normal mode */
649 0, /* print externs as global */
650 ".asm", /* assembler file extension */
651 NULL /* no do_assemble function */
654 pic16_linkCmd, /* linker command and arguments */
655 NULL, /* alternate macro based form */
656 NULL, /* no do_link function */
657 ".o", /* extension for object files */
658 0 /* no need for linker file */
670 3, /* fptr, far pointers (see Microchip) */
677 "XSEG (XDATA)", // xstack
678 "STACK (DATA)", // istack
679 "CSEG (CODE)", // code
680 "DSEG (DATA)", // data
681 "ISEG (DATA)", // idata
682 "XSEG (XDATA)", // xdata
684 "RSEG (DATA)", // reg
685 "GSINIT (CODE)", // static
686 "OSEG (OVR,DATA)", // overlay
687 "GSFINAL (CODE)", // post static
688 "HOME (CODE)", // home
691 NULL, // default location for auto vars
692 NULL, // default location for global vars
693 1 // code is read only 1=yes
696 NULL, /* genExtraAreaDeclaration */
697 NULL /* genExatrAreaLinkOptions */
700 /* stack related information */
701 -1, /* -1 stack grows downwards, +1 upwards */
702 1, /* extra overhead when calling between banks */
703 4, /* extra overhead when the function is an ISR */
704 1, /* extra overhead for a function call */
705 1, /* re-entrant space */
706 0 /* 'banked' call overhead, mild overlap with bank_overhead */
708 /* pic16 has an 8 bit mul */
713 pic16_emitDebuggerSymbol
720 _pic16_finaliseOptions,
721 _pic16_setDefaultOptions,
722 pic16_assignRegisters,
725 _pic16_genAssemblerPreamble,
726 NULL, /* no genAssemblerEnd */
728 NULL, // _pic16_genXINIT
729 NULL, /* genInitStartup */
730 _pic16_reset_regparm,
732 _process_pragma, /* process a pragma */
733 _pic16_mangleFunctionName, /* mangles function name */
735 hasExtBitOp, /* hasExtBitOp */
736 oclsExpense, /* oclsExpense */
738 TRUE, /* little endian */
741 1, /* transform <= to ! > */
742 1, /* transform >= to ! < */
743 1, /* transform != to !(a == b) */
745 FALSE, /* No array initializer support. */
746 0, //cseCostEstimation, /* !!!no CSE cost estimation yet */
747 NULL, /* no builtin functions */
748 GPOINTER, /* treat unqualified pointers as "generic" pointers */
749 1, /* reset labelKey to 1 */
750 1, /* globals & local static allowed */