X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?p=rmac;a=blobdiff_plain;f=object.c;h=d8b4b577017d2729031544cf7639325960a65bdb;hp=9a750ddaa6c638978e25447a081d84cb3165cae3;hb=d0c28c349ddfb8393568037f68bddbe8979ce0df;hpb=d09274f3e3d4dca122c308a621ea8edc100b7d99 diff --git a/object.c b/object.c index 9a750dd..d8b4b57 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" @@ -11,12 +11,12 @@ #include "symbol.h" #include "mark.h" #include "error.h" -#include "risca.h" +#include "riscasm.h" -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 // @@ -24,78 +24,76 @@ char * objimage; // Global object im // 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 - 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 + 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 + 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 + 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 + z |= 0x01000000; // Set global flag if requested - D_long(z); // Deposit symbol attribute + D_long(z); // Deposit symbol attribute - z = sym->svalue; // Obtain symbol value - w1 &= DATA|BSS; // Determine DATA or BSS flag + 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 + 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 + z += sect[DATA].sloc; // If BSS add DATA segment size - D_long(z); // Deposit symbol value + 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 + 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; } // -// Generate object file +// Write an object file to the passed in file descriptor +// N.B.: Return value is ignored... // -int object(WORD fd) +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 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 // 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 + 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) { @@ -103,9 +101,9 @@ int object(WORD fd) return ERROR; } - memset(buf, 0, 0x400000); // Reset allocated memory - objimage = buf; // Set global object image pointer - strtable = malloc(0x200000); // Allocate 2mb scratch buffer + memset(buf, 0, 0x600000); // Reset allocated memory + objImage = buf; // Set global object image pointer + strtable = malloc(0x200000); // Allocate 2mb scratch buffer if (strtable == NULL) { @@ -113,69 +111,66 @@ int object(WORD fd) return ERROR; } - memset(strtable, 0, 0x200000); // Reset allocated memory + 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 + 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) { - copy(p, cp->chptr, cp->ch_size); + 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 + 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 + 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 + 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 + 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 + memcpy(p, strtable, strindx); // Copy string table to object image if (buf) - free(strtable); // Free allocated memory + free(strtable); // Free allocated memory - chptr = p; // Point to string table size long - D_long(strindx); // Write string table size + 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); + unused = write(fd, buf, BSDHDRSIZE + tds + trsize + drsize + symsize + strindx + 4); if (buf) - free(buf); // Free allocated memory + free(buf); // Free allocated memory break; } return 0; } +