// 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"
#include "error.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
+/*
+ * 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
//
//
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
{
}
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;
+}
+
+
+/*
+ * 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++ = 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 object(WORD fd)
+int WriteObject(int fd)
{
LONG t; // Scratch long
LONG tds; // TEXT & DATA segment size
return ERROR;
}
- memset(buf, 0, 0x600000); // 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)
{
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
- 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
+ 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(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
+ 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
unused = write(fd, buf, BSDHDRSIZE + tds + trsize + drsize + symsize + strindx + 4);
if (buf)
- free(buf); // Free allocated memory
+ 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;
}
+
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