X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?p=rmac;a=blobdiff_plain;f=object.c;h=d09388b88daf2edadba04bd21130ede04a54565d;hp=1608edeb09bc3a3ef41d486c76b92fa779b90828;hb=20e4cceed7398282a904d9e6ecbed4760ce24d84;hpb=75cce0d9eb190f6094f66ae283b5981af25e5a57 diff --git a/object.c b/object.c index 1608ede..d09388b 100644 --- a/object.c +++ b/object.c @@ -3,7 +3,7 @@ // OBJECT.C - Writing Object Files // Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986 -// Source Utilised with the Kind Permission of Landon Dyer +// Source utilised with the kind permission of Landon Dyer // #include "object.h" @@ -11,149 +11,352 @@ #include "symbol.h" #include "mark.h" #include "error.h" -#include "risca.h" +#include "riscasm.h" + +/* + * Imports + */ +extern int obj_format; // object file format to write +extern int prg_flag; // generate Atari ST direct executable + +LONG symsize = 0; // Size of BSD symbol table +LONG strindx = 0x00000004; // BSD string table index +char * strtable; // Pointer to the symbol string table +char * objImage; // Global object image pointer -LONG symsize = 0; // Size of BSD symbol table -LONG strindx = 0x00000004; // BSD string table index -char *strtable; // Pointer to the symbol string table -char *objimage; // Global object image pointer // -// --- Add an entry to the BSD symbol table -------------------------------------------------------- +// Add an entry to the BSD symbol table // +char * constr_bsdsymtab(char * buf, SYM * sym, int globflag) +{ + chptr = buf; // Point to buffer for deposit longs + D_long(strindx); // Deposit the symbol string index + + WORD w1 = sym->sattr; // Obtain symbol attribute + int w2 = sym->sattre; + LONG z = 0; // Initialise resulting symbol flags + + if (w1 & EQUATED) + { + z = 0x02000000; // Set equated flag + } + else + { + switch (w1 & TDB) + { + case TEXT: z = 0x04000000; break; // Set TEXT segment flag + case DATA: z = 0x06000000; break; // Set DATA segment flag + case BSS : z = 0x08000000; break; // Set BSS segment flag + } + } + + if (globflag) + z |= 0x01000000; // Set global flag if requested + + D_long(z); // Deposit symbol attribute + + z = sym->svalue; // Obtain symbol value + w1 &= DATA | BSS; // Determine DATA or BSS flag + + if (w1) + z += sect[TEXT].sloc; // If DATA or BSS add TEXT segment size -char *constr_bsdsymtab(char *buf, SYM *sym, int globflag) { - LONG z; // Scratch long - WORD w1; // Scratch word - int w2; // Scratch long - - chptr = buf; // Point to buffer for deposit longs - D_long(strindx); // Deposit the symbol string index - - w1 = sym->sattr; // Obtain symbol attribute - w2 = sym->sattre; - z = 0; // Initialise resulting symbol flags - if(w1 & EQUATED) { - z = 0x02000000; // Set equated flag - } else { - switch(w1 & TDB) { - case TEXT: z = 0x04000000; break; // Set TEXT segment flag - case DATA: z = 0x06000000; break; // Set DATA segment flag - case BSS : z = 0x08000000; break; // Set BSS segment flag - } - } - if(globflag) z |= 0x01000000; // Set global flag if requested - D_long(z); // Deposit symbol attribute - - z = sym->svalue; // Obtain symbol value - w1 &= DATA|BSS; // Determine DATA or BSS flag - if(w1) - z += sect[TEXT].sloc; // If DATA or BSS add TEXT segment size - if(w1 & BSS) - z += sect[DATA].sloc; // If BSS add DATA segment size - D_long(z); // Deposit symbol value - - strcpy(strtable + strindx, sym->sname); - - strindx += strlen(sym->sname) + 1; // Incr string index incl null terminate - buf += 12; // Increment buffer to next record - symsize += 12; // Increment symbol table size - - return(buf); + if (w1 & BSS) + z += sect[DATA].sloc; // If BSS add DATA segment size + + D_long(z); // Deposit symbol value + + strcpy(strtable + strindx, sym->sname); + + strindx += strlen(sym->sname) + 1; // Incr string index incl null terminate + buf += 12; // Increment buffer to next record + symsize += 12; // Increment symbol table size + + return buf; } + +/* + * Alcyon symbol flags + */ +#define AL_DEFINED 0x8000 +#define AL_EQUATED 0x4000 +#define AL_GLOBAL 0x2000 +#define AL_EQUREG 0x1000 +#define AL_EXTERN 0x0800 +#define AL_DATA 0x0400 +#define AL_TEXT 0x0200 +#define AL_BSS 0x0100 +#define AL_FILE 0x0080 + + +static WORD tdb_tab[] = { + 0, /* absolute */ + AL_TEXT, /* TEXT segment based */ + AL_DATA, 0, /* DATA segment based */ + AL_BSS /* BSS segment based */ +}; + + +#define HDRSIZE 0x1C /* size of Alcyon header */ + + +/* + * Add entry to symbol table; + * if `globflag' is 1, make the symbol global; + * if in .PRG mode, adjust symbol values for fake link. + * + */ +char * constr_symtab(register char * buf, SYM * sym, int globflag) +{ + register int i; + register char * s; + register WORD w; + register LONG z; + register WORD w1; + + /* + * Copy symbol name + */ + s = sym->sname; + + for(i=0; i<8 && *s; i++) + *buf++ = *s++; + + while (i++ < 8) + *buf++ = '\0'; + + /* + * Construct and deposit flag word + * + * o all symbols are AL_DEFINED + * o install T/D/B/A base + * o install 'equated' + * o commons (COMMON) are AL_EXTERN, but not BSS + * o exports (DEFINED) are AL_GLOBAL + * o imports (~DEFINED) are AL_EXTERN + * + */ + w1 = sym->sattr; + w = AL_DEFINED | tdb_tab[w1 & TDB]; + + if (w1 & EQUATED) /* equated */ + w |= AL_EQUATED; + + if (w1 & COMMON) + { + w |= AL_EXTERN | AL_GLOBAL; /* common symbol */ + w &= ~AL_BSS; /* they're not BSS in Alcyon object files */ + } + else if (w1 & DEFINED) + { + if (globflag) /* export the symbol */ + w |= AL_GLOBAL; + } + else w |= AL_EXTERN; /* imported symbol */ + + *buf++ = w >> 8; + *buf++ = (char)w; + + z = sym->svalue; + + if (prg_flag) /* relocate value in .PRG segment */ + { + w1 &= DATA | BSS; + + if (w1) + z += sect[TEXT].sloc; + + if (w1 & BSS) + z += sect[DATA].sloc; + } + + *buf++ = z >> 24; /* deposit symbol value */ + *buf++ = z >> 16; + *buf++ = z >> 8; + *buf++ = z; + + return buf; +} + + // -// --- Generate object file ------------------------------------------------------------------------ +// Write an object file to the passed in file descriptor +// N.B.: Return value is ignored... // +int WriteObject(int fd) +{ + LONG t; // Scratch long + LONG tds; // TEXT & DATA segment size + int i; // Temporary int + CHUNK * cp; // Chunk (for gather) + char * buf; // Scratch area + char * p; // Temporary ptr + LONG ssize; // Size of symbols + LONG trsize, drsize; // Size of relocations + long unused; // For supressing 'write' warnings -int object(WORD fd) { - LONG t; // Scratch long - LONG tds; // TEXT & DATA segment size - int i; // Temporary int - CHUNK *cp; // Chunk (for gather) - char *buf; // Scratch area - char *p; // Temporary ptr - LONG ssize; // Size of symbols - LONG trsize, drsize; // Size of relocations - - // Write requested object file... - switch(obj_format) { - case BSD: - ssize = ((LONG)sy_assign(NULL, NULL)); // Assign index numbers to the symbols - tds = sect[TEXT].sloc + sect[DATA].sloc; // Get size of TEXT and DATA segment - buf = malloc(0x400000); // Allocate 4mb object file image memory - if(buf == NULL) { - error("cannot allocate object file memory (in BSD mode)"); - return(ERROR); - } - memset(buf, 0, 0x400000); // Reset allocated memory - objimage = buf; // Set global object image pointer - strtable = malloc(0x200000); // Allocate 2mb scratch buffer - if(strtable == NULL) { - error("cannot allocate string table memory (in BSD mode)"); - return(ERROR); - } - memset(strtable, 0, 0x200000); // Reset allocated memory - - // Build object file header - chptr = buf; // Base of header - t = 0x00000107; - D_long(t); // Magic number - t = sect[TEXT].sloc; // TEXT size - D_long(t); - t = sect[DATA].sloc; // DATA size - D_long(t); - t = sect[BSS].sloc; // BSS size - D_long(t); - t = 0x00000000; - D_long(t); // Symbol size - D_long(t); // First entry (0L) - D_long(t); // TEXT relocation size - D_long(t); // BSD relocation size - - // Construct TEXT and DATA segments (without relocation changes) - p = buf + BSDHDRSIZE; - for(i = TEXT; i <= DATA; ++i) - for(cp = sect[i].sfcode; cp != NULL; cp = cp->chnext) { - copy(p, cp->chptr, cp->ch_size); - p += cp->ch_size; - } - - // Do relocation tables (and make changes to segment data) - p = buf + (BSDHDRSIZE + tds); // Move obj image ptr to reloc info - trsize = bsdmarkimg(p, tds, sect[TEXT].sloc, TEXT);// Do TEXT relocation table - chptr = buf + 24; // Point to relocation hdr entry - D_long(trsize); // Write the relocation table size - p = buf + (BSDHDRSIZE + tds + trsize); // Move obj image ptr to reloc info - drsize = bsdmarkimg(p, tds, sect[TEXT].sloc, DATA);// Do DATA relocation table - chptr = buf + 28; // Point to relocation hdr entry - D_long(drsize); // Write the relocation table size - - p = buf + (BSDHDRSIZE + tds + trsize + drsize); // Point to start of symbol table - sy_assign(p, constr_bsdsymtab); // Build symbol and string tables - chptr = buf + 16; // Point to sym table size hdr entry - D_long(symsize); // Write the symbol table size - - // Point to string table - p = buf + (BSDHDRSIZE + tds + trsize + drsize + symsize); - - memcpy(p, strtable, strindx); // Copy string table to object image - if(buf) free(strtable); // Free allocated memory - chptr = p; // Point to string table size long - D_long(strindx); // Write string table size - - // Write the BSD object file from the object image buffer - write(fd, buf, BSDHDRSIZE + tds + trsize + drsize + symsize + strindx + 4); - - if(buf) free(buf); // Free allocated memory - break; - } - - return(0); -} + // Write requested object file... + switch (obj_format) + { + case BSD: + ssize = ((LONG)sy_assign(NULL, NULL)); // Assign index numbers to the symbols + tds = sect[TEXT].sloc + sect[DATA].sloc; // Get size of TEXT and DATA segment + buf = malloc(0x600000); // Allocate 6mb object file image memory + + if (buf == NULL) + { + error("cannot allocate object file memory (in BSD mode)"); + return ERROR; + } + + memset(buf, 0, 0x600000); // Reset allocated memory + objImage = buf; // Set global object image pointer + strtable = malloc(0x200000); // Allocate 2mb scratch buffer + + if (strtable == NULL) + { + error("cannot allocate string table memory (in BSD mode)"); + return ERROR; + } + + memset(strtable, 0, 0x200000); // Reset allocated memory + + // Build object file header + chptr = buf; // Base of header + D_long(0x00000107); // Magic number + D_long(sect[TEXT].sloc); // TEXT size + D_long(sect[DATA].sloc); // DATA size + D_long(sect[BSS].sloc); // BSS size + D_long(0x00000000); // Symbol size + D_long(0x00000000); // First entry (0L) + D_long(0x00000000); // TEXT relocation size + D_long(0x00000000); // BSD relocation size + + // Construct TEXT and DATA segments (without relocation changes) + p = buf + BSDHDRSIZE; + + for(i=TEXT; i<=DATA; ++i) + { + for(cp=sect[i].sfcode; cp!=NULL; cp=cp->chnext) + { + memcpy(p, cp->chptr, cp->ch_size); + p += cp->ch_size; + } + } + + // Do relocation tables (and make changes to segment data) + p = buf + (BSDHDRSIZE + tds); // Move obj image ptr to reloc info + trsize = bsdmarkimg(p, tds, sect[TEXT].sloc, TEXT);// Do TEXT relocation table + chptr = buf + 24; // Point to relocation hdr entry + D_long(trsize); // Write the relocation table size + p = buf + (BSDHDRSIZE + tds + trsize); // Move obj image ptr to reloc info + drsize = bsdmarkimg(p, tds, sect[TEXT].sloc, DATA);// Do DATA relocation table + chptr = buf + 28; // Point to relocation hdr entry + D_long(drsize); // Write the relocation table size + + p = buf + (BSDHDRSIZE + tds + trsize + drsize);// Point to start of symbol table + sy_assign(p, constr_bsdsymtab); // Build symbol and string tables + chptr = buf + 16; // Point to sym table size hdr entry + D_long(symsize); // Write the symbol table size + + // Point to string table + p = buf + (BSDHDRSIZE + tds + trsize + drsize + symsize); + memcpy(p, strtable, strindx); // Copy string table to object image + if (buf) + free(strtable); // Free allocated memory + chptr = p; // Point to string table size long + D_long(strindx); // Write string table size + // Write the BSD object file from the object image buffer + unused = write(fd, buf, BSDHDRSIZE + tds + trsize + drsize + symsize + strindx + 4); + if (buf) + free(buf); // Free allocated memory + + break; + + case ALCYON: + /* + * Compute size of symbol table; + * assign numbers to the symbols... + */ + ssize = 0; + + if (prg_flag != 1) + ssize = ((LONG)sy_assign(NULL, NULL)) * 14; + + /* + * Alloc memory for header+text+data, symbol and + * relocation information construction. + */ + t = tds = sect[TEXT].sloc + sect[DATA].sloc; + + if (t < ssize) + t = ssize; + + buf = malloc((t + HDRSIZE) + HDRSIZE); + + /* + * Build object file header + * just before the text+data image + */ + chptr = buf - HDRSIZE; /* -> base of header */ + D_word(0x601a); /* magic number */ + t = sect[TEXT].sloc; /* TEXT size */ + D_long(t); + t = sect[DATA].sloc; /* DATA size */ + D_long(t); + t = sect[BSS].sloc; /* BSS size */ + D_long(t); + D_long(ssize); /* symbol table size */ + D_long(0); /* stack size (unused) */ + D_long(0); /* entry point (unused) */ + D_word(0); /* relocation information exists */ + + /* + * Construct text and data segments; + * fixup relocatable longs in .PRG mode; + * finally write the header+text+data + */ + p = buf; + + for(i=TEXT; i<=DATA; i++) + { + for (cp=sect[i].sfcode; cp!=NULL; cp=cp->chnext) + { + memcpy(p, cp->chptr, cp->ch_size); + p += cp->ch_size; + } + } + + if (prg_flag) + markimg(buf, tds, sect[TEXT].sloc, 0); + + write(fd, buf - HDRSIZE, tds + HDRSIZE); + + /* + * Construct and write symbol table + */ + if (prg_flag != 1) + { + sy_assign(buf, constr_symtab); + write(fd, buf, ssize); + } + + /* + * Construct and write relocation information; + * the size of it changes if we're writing a RELMODed executable. + */ + tds = markimg(buf, tds, sect[TEXT].sloc, 1); + write(fd, buf, tds); + break; + } + + return 0; +}