4 * (C) Copyright 1989-1995
12 * - change lkparea to use a_type == 0 as "virgin area" flag
13 * 02-Apr-98 JLH: add code to link 8051 data spaces
22 * The module lkarea.c contains the functions which
23 * create and link together all area definitions read
24 * from the .rel file(s).
26 * lkarea.c contains the following functions:
32 * lkarea.c contains no global variables.
35 /*)Function VOID newarea()
37 * The function newarea() creates and/or modifies area
38 * and areax structures for each A directive read from
39 * the .rel file(s). The function lkparea() is called
40 * to find the area structure associated with this name.
41 * If the area does not yet exist then a new area
42 * structure is created and linked to any existing
43 * linked area structures. The area flags are copied
44 * into the area flag variable. For each occurence of
45 * an A directive an areax structure is created and
46 * linked to the areax structures associated with this
47 * area. The size of this area section is placed into
48 * the areax structure. The flag value for all subsequent
49 * area definitions for the same area are compared and
50 * flagged as an error if they are not identical.
51 * The areax structure created for every occurence of
52 * an A directive is loaded with a pointer to the base
53 * area structure and a pointer to the associated
54 * head structure. And finally, a pointer to this
55 * areax structure is loaded into the list of areax
56 * structures in the head structure. Refer to lkdata.c
57 * for details of the structures and their linkage.
60 * areax **halp pointer to an array of pointers
61 * int i counter, loop variable, value
63 * int narea number of areas in this head structure
64 * areax * taxp pointer to an areax structure
68 * area *ap Pointer to the current
70 * areax *axp Pointer to the current
72 * head *hp Pointer to the current
74 * int lkerr error flag
77 * Addr_T eval() lkeval.c
78 * VOID exit() c_library
79 * int fprintf() c_library
80 * VOID getid() lklex.c
81 * VOID lkparea() lkarea.c
85 * The area and areax structures are created and
86 * linked with the appropriate head structures.
87 * Failure to allocate area or areax structure
88 * space will terminate the linker. Other internal
89 * errors most likely caused by corrupted .rel
90 * files will also terminate the linker.
94 * Create an area entry.
96 * A xxxxxx size nnnn flags mm
99 * | `------------- axp->a_size
100 * `------------------------- ap->a_id
106 register int i, narea;
120 axp->a_size = eval();
127 while (taxp->a_axp) {
135 /* if (i && (ap->a_flag != i)) { */
136 /* fprintf(stderr, "Conflicting flags in area %8s\n", id); */
141 * Evaluate area address
144 axp->a_addr = eval();
146 * Place pointer in header area list
149 fprintf(stderr, "No header defined\n");
154 for (i=0; i < narea ;++i) {
155 if (halp[i] == NULL) {
160 fprintf(stderr, "Header area list overflow\n");
164 /*)Function VOID lkparea(id)
166 * char * id pointer to the area name string
168 * The function lkparea() searches the linked area structures
169 * for a name match. If the name is not found then an area
170 * structure is created. An areax structure is created and
171 * appended to the areax structures linked to the area structure.
172 * The associated base area and head structure pointers are
173 * loaded into the areax structure.
176 * area * tap pointer to an area structure
177 * areax * taxp pointer to an areax structure
180 * area *ap Pointer to the current
182 * area *areap The pointer to the first
183 * area structure of a linked list
184 * areax *axp Pointer to the current
188 * VOID * new() lksym()
189 * char * strcpy() c_library
190 * int symeq() lksym.c
193 * Area and/or areax structures are created.
194 * Failure to allocate space for created structures
195 * will terminate the linker.
201 register struct area *tap;
202 register struct areax *taxp;
205 axp = (struct areax *) new (sizeof(struct areax));
206 axp->a_addr = -1; /* default: no address yet */
208 if (symeq(id, ap->a_id)) {
219 ap = (struct area *) new (sizeof(struct area));
231 strncpy(ap->a_id, id, NCPS);
235 /*)Function VOID lnkarea()
237 * The function lnkarea() resolves all area addresses.
238 * The function evaluates each area structure (and all
239 * the associated areax structures) in sequence. The
240 * linking process supports four (4) possible area types:
242 * ABS/OVR - All sections (each individual areax
243 * section) starts at the identical base
244 * area address overlaying all other
245 * areax sections for this area. The
246 * size of the area is largest of the area
249 * ABS/CON - All sections (each individual areax
250 * section) are concatenated with the
251 * first section starting at the base
252 * area address. The size of the area
253 * is the sum of the section sizes.
255 * NOTE: Multiple absolute (ABS) areas are
256 * never concatenated with each other,
257 * thus absolute area A and absolute area
258 * B will overlay each other if they begin
259 * at the same location (the default is
260 * always address 0 for absolute areas).
262 * REL/OVR - All sections (each individual areax
263 * section) starts at the identical base
264 * area address overlaying all other
265 * areax sections for this area. The
266 * size of the area is largest of the area
269 * REL/CON - All sections (each individual areax
270 * section) are concatenated with the
271 * first section starting at the base
272 * area address. The size of the area
273 * is the sum of the section sizes.
275 * NOTE: Relocatable (REL) areas are always concatenated
276 * with each other, thus relocatable area B
277 * (defined after area A) will follow
278 * relocatable area A independent of the
279 * starting address of area A. Within a
280 * specific area each areax section may be
281 * overlayed or concatenated with other
285 * If a base address for an area is specified then the
286 * area will start at that address. Any relocatable
287 * areas defined subsequently will be concatenated to the
288 * previous relocatable area if it does not have a base
291 * The names s_<areaname> and l_<areaname> are created to
292 * define the starting address and length of each area.
295 * Addr_T rloc ;current relocation address
296 * char temp[] ;temporary string
297 * struct symbol *sp ;symbol structure
300 * area *ap Pointer to the current
302 * area *areap The pointer to the first
303 * area structure of a linked list
306 * int fprintf() c_library
307 * VOID lnksect() lkarea.c
308 * symbol *lkpsym() lksym.c
309 * char * strncpy() c_library
310 * int symeq() lksym.c
313 * All area and areax addresses and sizes are
314 * determined and saved in their respective
318 unsigned long codemap[2048];
319 Addr_T lnksect(struct area *tap);
321 * Resolve all area addresses.
326 Addr_T rloc[4] = {0, 0, 0, 0};
331 /*JCF: used to save the REG_BANK_[0-3] and SBIT_BYTES area pointers*/
334 struct area *abs_ap = NULL;
335 struct area *gs0_ap = NULL;
337 memset(codemap, 0, sizeof(codemap));
339 /* first sort all absolute areas to the front */
341 /* no need to check first area, it's in front anyway */
342 while (ap && ap->a_ap)
344 if (ap->a_ap->a_flag & A_ABS)
345 {/* next area is absolute, move it to front,
346 reversed sequence is no problem for absolutes */
348 ap->a_ap = abs_ap->a_ap;
349 abs_ap->a_ap = areap;
358 /* next accumulate all GSINITx/GSFINAL area sizes
359 into GSINIT so they stay together */
363 if (!strncmp(ap->a_id, "GS", 2))
370 ap->a_size += axp->a_size;
374 gs_size += ap->a_size;
375 if (!strcmp(ap->a_id, "GSINIT0"))
383 gs0_ap->a_size = gs_size;
387 if (ap->a_flag & A_ABS) {
393 /* Determine memory space */
396 if (ap->a_flag & A_CODE) {
399 if (ap->a_flag & A_XDATA) {
402 if (ap->a_flag & A_BIT) {
407 * Relocatable sections
409 if (ap->a_type == 0) { /* JLH */
410 if (ap->a_flag & A_NOLOAD) {
414 ap->a_addr = rloc[ locIndex ];
419 rloc[ locIndex ] = lnksect(ap);
423 * Create symbols called:
424 * s_<areaname> the start address of the area
425 * l_<areaname> the length of the area
428 if (! symeq(ap->a_id, _abs_))
430 strncpy(temp+2,ap->a_id,NCPS-2);
434 sp = lkpsym(temp, 1);
435 sp->s_addr = ap->a_addr ;
436 /* sp->s_axp = ap->a_axp; JLH: was NULL; */
440 sp = lkpsym(temp, 1);
441 sp->s_addr = ap->a_size;
447 /*JCF: Since area BSEG is defined just before BSEG_BYTES, use the bit size of BSEG
448 to compute the byte size of BSEG_BYTES: */
449 if (!strcmp(ap->a_id, "BSEG")) {
450 ap->a_ap->a_axp->a_size=(ap->a_addr/8)+((ap->a_size+7)/8); /*Bits to bytes*/
452 else if (!strcmp(ap->a_id, "REG_BANK_0")) ta[0]=ap;
453 else if (!strcmp(ap->a_id, "REG_BANK_1")) ta[1]=ap;
454 else if (!strcmp(ap->a_id, "REG_BANK_2")) ta[2]=ap;
455 else if (!strcmp(ap->a_id, "REG_BANK_3")) ta[3]=ap;
456 else if (!strcmp(ap->a_id, "BSEG_BYTES"))
461 /*If upper register banks are not used roll back the relocation counter*/
462 if ( (ta[j]->a_size==0) && (ta[j-1]->a_size==0) )
474 Addr_T find_empty_space(Addr_T start, Addr_T size, unsigned long *map)
477 unsigned long mask, b;
483 j = (start + size) >> 5;
484 mask = -(1 << (start & 0x1F));
491 for (b=0x80000000; b!=0; b>>=1, k--)
506 mask &= (1 << ((start + size) & 0x1F)) - 1;
510 for (b=0x80000000; b!=0; b>>=1, k--)
515 start = (a & ~0x1F) + k;
524 Addr_T allocate_space(Addr_T start, Addr_T size, char* id, unsigned long *map)
530 j = (start + size) >> 5;
531 mask = -(1 << (start & 0x1F));
537 fprintf(stderr, "memory overlap near 0x%X for %s\n", a, id);
543 mask &= (1 << ((start + size) & 0x1F)) - 1;
546 fprintf(stderr, "memory overlap near 0x%X for %s\n", a, id);
552 /*)Function VOID lnksect()
554 * area * tap pointer to an area structure
556 * The function lnksect() is the function called by
557 * lnkarea() to resolve the areax addresses. Refer
558 * to the function lnkarea() for more detail. Pageing
559 * boundary and length errors will be reported by this
563 * Addr_T size size of area
564 * Addr_T addr address of area
565 * areax * taxp pointer to an areax structure
568 * int lkerr error flag
574 * All area and areax addresses and sizes area determined
575 * and linked into the structures.
578 Addr_T lnksect(struct area *tap)
580 register Addr_T size, addr;
581 register struct areax *taxp;
586 if ((tap->a_flag&A_PAG) && (addr & 0xFF)) {
588 "\n?ASlink-Warning-Paged Area %8s Boundary Error\n", tap->a_id);
593 if (tap->a_flag&A_OVR) {
599 if (taxp->a_size > size)
603 } else if (tap->a_flag & A_ABS) {
608 allocate_space(taxp->a_addr, taxp->a_size, tap->a_id, codemap);
609 taxp->a_addr = 0; /* reset to zero so relative addresses become absolute */
610 size += taxp->a_size;
615 * Concatenated sections
618 addr = find_empty_space(addr, tap->a_size, codemap);
621 //find next unused address now
624 addr = find_empty_space(addr, taxp->a_size, codemap);
625 allocate_space(addr, taxp->a_size, tap->a_id, codemap);
628 addr += taxp->a_size;
629 size += taxp->a_size;
635 if ((tap->a_flag&A_PAG) && (size > 256)) {
637 "\n?ASlink-Warning-Paged Area %8s Length Error\n", tap->a_id);