X-Git-Url: http://shamusworld.gotdns.org/cgi-bin/gitweb.cgi?p=rmac;a=blobdiff_plain;f=object.c;h=baed1bdb3c0a519edade750d094742d3f1a2b54d;hp=ffff6231dc17bee1aa1547e69662cd9fa567977e;hb=01ad052f31fbf2660fec864060aca90c7761a25a;hpb=d95ee7f628ceac9af515079fb6797476557a23d2 diff --git a/object.c b/object.c index ffff623..baed1bd 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" @@ -12,11 +12,18 @@ #include "mark.h" #include "error.h" #include "riscasm.h" +#include "mark.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 +char * objImage; // Global object image pointer // @@ -71,10 +78,137 @@ char * constr_bsdsymtab(char * buf, SYM * sym, int globflag) } +/* + * 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 + +LONG PRGFLAGS; /* PRGFLAGS as defined in Atari Compendium Chapter 2 */ + /* Definition Bit(s) Meaning */ + /* PF_FASTLOAD 0 If set, clear only the BSS area on program load, */ + /* otherwise clear the entire heap. */ + /* PF_TTRAMLOAD 1 If set, the program may be loaded into alternative RAM, */ + /* otherwise it must be loaded into standard RAM. */ + /* PF_TTRAMMEM 2 If set, the program's Malloc() requests may be satisfied */ + /* from alternative RAM, otherwise they must be satisfied */ + /* from standard RAM. */ + /* - 3 Currently unused. */ + /* See left. 4 & 5 If these bits are set to 0 (PF_PRIVATE), the processes' */ + /* entire memory space will be considered private */ + /* (when memory protection is enabled).If these bits are */ + /* set to 1 (PF_GLOBAL), the processes' entire memory space */ + /* will be readable and writable by any process (i.e. global). */ + /* If these bits are set to 2 (PF_SUPERVISOR), the processes' */ + /* entire memory space will only be readable and writable by */ + /* itself and any other process in supervisor mode.If these */ + /* bits are set to 3 (PF_READABLE), the processes' entire memory */ + /* space will be readable by any application but only */ + /* writable by itself. */ + /* - 6-15 Currently unused. */ + +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 object(WORD fd) +int WriteObject(int fd) { LONG t; // Scratch long LONG tds; // TEXT & DATA segment size @@ -100,9 +234,9 @@ int object(WORD fd) 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) { @@ -110,18 +244,18 @@ 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 - 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; @@ -130,7 +264,7 @@ int object(WORD fd) { 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; } } @@ -168,7 +302,84 @@ int object(WORD fd) 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; } +