2 // RMAC - Reboot's Macro Assembler for the Atari Jaguar Console System
3 // OBJECT.C - Writing Object Files
4 // Copyright (C) 199x Landon Dyer, 2011 Reboot and Friends
5 // RMAC derived from MADMAC v1.07 Written by Landon Dyer, 1986
6 // Source Utilised with the Kind Permission of Landon Dyer
16 LONG symsize = 0; // Size of BSD symbol table
17 LONG strindx = 0x00000004; // BSD string table index
18 char *strtable; // Pointer to the symbol string table
19 char *objimage; // Global object image pointer
22 // --- Add an entry to the BSD symbol table --------------------------------------------------------
25 char *constr_bsdsymtab(char *buf, SYM *sym, int globflag) {
26 LONG z; // Scratch long
27 WORD w1; // Scratch word
28 int w2; // Scratch long
30 chptr = buf; // Point to buffer for deposit longs
31 D_long(strindx); // Deposit the symbol string index
33 w1 = sym->sattr; // Obtain symbol attribute
35 z = 0; // Initialise resulting symbol flags
37 z = 0x02000000; // Set equated flag
40 case TEXT: z = 0x04000000; break; // Set TEXT segment flag
41 case DATA: z = 0x06000000; break; // Set DATA segment flag
42 case BSS : z = 0x08000000; break; // Set BSS segment flag
45 if(globflag) z |= 0x01000000; // Set global flag if requested
46 D_long(z); // Deposit symbol attribute
48 z = sym->svalue; // Obtain symbol value
49 w1 &= DATA|BSS; // Determine DATA or BSS flag
51 z += sect[TEXT].sloc; // If DATA or BSS add TEXT segment size
53 z += sect[DATA].sloc; // If BSS add DATA segment size
54 D_long(z); // Deposit symbol value
56 strcpy(strtable + strindx, sym->sname);
58 strindx += strlen(sym->sname) + 1; // Incr string index incl null terminate
59 buf += 12; // Increment buffer to next record
60 symsize += 12; // Increment symbol table size
66 // --- Generate object file ------------------------------------------------------------------------
70 LONG t; // Scratch long
71 LONG tds; // TEXT & DATA segment size
72 int i; // Temporary int
73 CHUNK *cp; // Chunk (for gather)
74 char *buf; // Scratch area
75 char *p; // Temporary ptr
76 LONG ssize; // Size of symbols
77 LONG trsize, drsize; // Size of relocations
79 // Write requested object file...
82 ssize = ((LONG)sy_assign(NULL, NULL)); // Assign index numbers to the symbols
83 tds = sect[TEXT].sloc + sect[DATA].sloc; // Get size of TEXT and DATA segment
84 buf = malloc(0x400000); // Allocate 4mb object file image memory
86 error("cannot allocate object file memory (in BSD mode)");
89 memset(buf, 0, 0x400000); // Reset allocated memory
90 objimage = buf; // Set global object image pointer
91 strtable = malloc(0x200000); // Allocate 2mb scratch buffer
92 if(strtable == NULL) {
93 error("cannot allocate string table memory (in BSD mode)");
96 memset(strtable, 0, 0x200000); // Reset allocated memory
98 // Build object file header
99 chptr = buf; // Base of header
101 D_long(t); // Magic number
102 t = sect[TEXT].sloc; // TEXT size
104 t = sect[DATA].sloc; // DATA size
106 t = sect[BSS].sloc; // BSS size
109 D_long(t); // Symbol size
110 D_long(t); // First entry (0L)
111 D_long(t); // TEXT relocation size
112 D_long(t); // BSD relocation size
114 // Construct TEXT and DATA segments (without relocation changes)
115 p = buf + BSDHDRSIZE;
116 for(i = TEXT; i <= DATA; ++i)
117 for(cp = sect[i].sfcode; cp != NULL; cp = cp->chnext) {
118 copy(p, cp->chptr, cp->ch_size);
122 // Do relocation tables (and make changes to segment data)
123 p = buf + (BSDHDRSIZE + tds); // Move obj image ptr to reloc info
124 trsize = bsdmarkimg(p, tds, sect[TEXT].sloc, TEXT);// Do TEXT relocation table
125 chptr = buf + 24; // Point to relocation hdr entry
126 D_long(trsize); // Write the relocation table size
127 p = buf + (BSDHDRSIZE + tds + trsize); // Move obj image ptr to reloc info
128 drsize = bsdmarkimg(p, tds, sect[TEXT].sloc, DATA);// Do DATA relocation table
129 chptr = buf + 28; // Point to relocation hdr entry
130 D_long(drsize); // Write the relocation table size
132 p = buf + (BSDHDRSIZE + tds + trsize + drsize); // Point to start of symbol table
133 sy_assign(p, constr_bsdsymtab); // Build symbol and string tables
134 chptr = buf + 16; // Point to sym table size hdr entry
135 D_long(symsize); // Write the symbol table size
137 // Point to string table
138 p = buf + (BSDHDRSIZE + tds + trsize + drsize + symsize);
140 memcpy(p, strtable, strindx); // Copy string table to object image
141 if(buf) free(strtable); // Free allocated memory
142 chptr = p; // Point to string table size long
143 D_long(strindx); // Write string table size
145 // Write the BSD object file from the object image buffer
146 write(fd, buf, BSDHDRSIZE + tds + trsize + drsize + symsize + strindx + 4);
148 if(buf) free(buf); // Free allocated memory