More fixups to remove warnings, removal of more cruft.
[rmac] / object.c
1 //
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
7 //
8
9 #include "object.h"
10 #include "sect.h"
11 #include "symbol.h"
12 #include "mark.h"
13 #include "error.h"
14 #include "riscasm.h"
15
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
20
21
22 //
23 // Add an entry to the BSD symbol table
24 //
25 char * constr_bsdsymtab(char * buf, SYM * sym, int globflag)
26 {
27         LONG z;                                                                 // Scratch long
28         WORD w1;                                                                // Scratch word
29         int w2;                                                                 // Scratch long
30
31         chptr = buf;                                                    // Point to buffer for deposit longs
32         D_long(strindx);                                                // Deposit the symbol string index
33
34         w1 = sym->sattr;                                                // Obtain symbol attribute
35         w2 = sym->sattre;
36         z = 0;                                                                  // Initialise resulting symbol flags
37
38         if (w1 & EQUATED)
39         {                                       
40                 z = 0x02000000;                                         // Set equated flag
41         }
42         else
43         {
44                 switch (w1 & TDB)
45                 {
46                 case TEXT: z = 0x04000000; break;       // Set TEXT segment flag
47                 case DATA: z = 0x06000000; break;       // Set DATA segment flag
48                 case BSS : z = 0x08000000; break;       // Set BSS segment flag
49                 }
50         }
51
52         if (globflag)
53                 z |= 0x01000000;                                        // Set global flag if requested
54
55         D_long(z);                                                              // Deposit symbol attribute
56
57         z = sym->svalue;                                                // Obtain symbol value
58         w1 &= DATA | BSS;                                               // Determine DATA or BSS flag
59
60         if (w1)                                                   
61                 z += sect[TEXT].sloc;                           // If DATA or BSS add TEXT segment size
62
63         if (w1 & BSS) 
64                 z += sect[DATA].sloc;                           // If BSS add DATA segment size
65
66         D_long(z);                                                              // Deposit symbol value
67
68         strcpy(strtable + strindx, sym->sname);
69
70         strindx += strlen(sym->sname) + 1;              // Incr string index incl null terminate
71         buf += 12;                                                              // Increment buffer to next record
72         symsize += 12;                                                  // Increment symbol table size
73
74         return buf;
75 }
76
77
78 //
79 // Generate object file
80 //
81 int object(WORD fd)
82 {
83         LONG t;                                 // Scratch long
84         LONG tds;                               // TEXT & DATA segment size
85         int i;                                  // Temporary int
86         CHUNK * cp;                             // Chunk (for gather)
87         char * buf;                             // Scratch area
88         char * p;                               // Temporary ptr
89         LONG ssize;                             // Size of symbols
90         LONG trsize, drsize;    // Size of relocations
91         long unused;                    // For supressing 'write' warnings
92
93         // Write requested object file...
94         switch (obj_format)
95         {
96         case BSD:
97                 ssize = ((LONG)sy_assign(NULL, NULL));          // Assign index numbers to the symbols
98                 tds = sect[TEXT].sloc + sect[DATA].sloc;        // Get size of TEXT and DATA segment
99                 buf = malloc(0x600000);                                         // Allocate 6mb object file image memory
100
101                 if (buf == NULL)
102                 {
103                         error("cannot allocate object file memory (in BSD mode)");
104                         return ERROR;
105                 }
106
107                 memset(buf, 0, 0x600000);                                       // Reset allocated memory
108                 objimage = buf;                                                         // Set global object image pointer
109                 strtable = malloc(0x200000);                            // Allocate 2mb scratch buffer 
110
111                 if (strtable == NULL)
112                 {
113                         error("cannot allocate string table memory (in BSD mode)");
114                         return ERROR;
115                 }
116
117                 memset(strtable, 0, 0x200000);                          // Reset allocated memory
118
119                 // Build object file header
120                 chptr = buf;                                                            // Base of header
121                 D_long(0x00000107);                                                     // Magic number
122                 D_long(sect[TEXT].sloc);                                        // TEXT size 
123                 D_long(sect[DATA].sloc);                                        // DATA size 
124                 D_long(sect[BSS].sloc);                                         // BSS size 
125                 D_long(0x00000000);                                                     // Symbol size
126                 D_long(0x00000000);                                                     // First entry (0L)
127                 D_long(0x00000000);                                                     // TEXT relocation size
128                 D_long(0x00000000);                                                     // BSD relocation size
129
130                 // Construct TEXT and DATA segments (without relocation changes)
131                 p = buf + BSDHDRSIZE;
132
133                 for(i=TEXT; i<=DATA; ++i)
134                 {
135                         for(cp=sect[i].sfcode; cp!=NULL; cp=cp->chnext)
136                         {
137                                 copy(p, cp->chptr, cp->ch_size);
138                                 p += cp->ch_size;
139                         }
140                 }
141
142                 // Do relocation tables (and make changes to segment data)
143                 p = buf + (BSDHDRSIZE + tds);                           // Move obj image ptr to reloc info
144                 trsize = bsdmarkimg(p, tds, sect[TEXT].sloc, TEXT);// Do TEXT relocation table
145                 chptr = buf + 24;                                                       // Point to relocation hdr entry
146                 D_long(trsize);                                                         // Write the relocation table size
147                 p = buf + (BSDHDRSIZE + tds + trsize);          // Move obj image ptr to reloc info
148                 drsize = bsdmarkimg(p, tds, sect[TEXT].sloc, DATA);// Do DATA relocation table
149                 chptr = buf + 28;                                                       // Point to relocation hdr entry
150                 D_long(drsize);                                                         // Write the relocation table size
151
152                 p = buf + (BSDHDRSIZE + tds + trsize + drsize);// Point to start of symbol table
153                 sy_assign(p, constr_bsdsymtab);                         // Build symbol and string tables
154                 chptr = buf + 16;                                                       // Point to sym table size hdr entry
155                 D_long(symsize);                                                        // Write the symbol table size
156
157                 // Point to string table
158                 p = buf + (BSDHDRSIZE + tds + trsize + drsize + symsize);    
159
160                 memcpy(p, strtable, strindx);                           // Copy string table to object image
161
162                 if (buf)
163                         free(strtable);                                                 // Free allocated memory
164
165                 chptr = p;                                                                      // Point to string table size long
166                 D_long(strindx);                                                        // Write string table size
167
168                 // Write the BSD object file from the object image buffer
169                 unused = write(fd, buf, BSDHDRSIZE + tds + trsize + drsize + symsize + strindx + 4);
170
171                 if (buf)
172                         free(buf);                                                              // Free allocated memory
173
174                 break;
175         }
176
177         return 0;
178 }