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Annotation of researchv9/cmd/sun/as/rel.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)rel.c 1.1 86/02/03 Copyr 1985 Sun Micro";
        !             3: #endif
        !             4: 
        !             5: /*
        !             6:  * Copyright (c) 1985 by Sun Microsystems, Inc.
        !             7:  */
        !             8: 
        !             9: #include "as.h"
        !            10: #include <a.out.h>
        !            11: 
        !            12: struct reloc{ struct relocation_info r; struct sym_bkt *rsymbol; };
        !            13: 
        !            14: /*  Handle output file processing for b.out files */
        !            15: 
        !            16: FILE *tout;            /* text portion of output file */
        !            17: FILE *dout;            /* data portion of output file */
        !            18: FILE *d1out;           /* data portion of output file */
        !            19: FILE *d2out;           /* data portion of output file */
        !            20: FILE *rtout;           /* text relocation commands */
        !            21: FILE *rdout;           /* data relocation commands */
        !            22: 
        !            23: long rtsize;           /* size of text relocation area */
        !            24: long rdsize;           /* size of data relocation area */
        !            25: 
        !            26: char *rname = "/tmp/as68XXXXXXXX";     /* name of file for relocation commands */
        !            27: 
        !            28: extern int ext_instruction_set;                /* = 1 for the 68020 assembler */
        !            29: 
        !            30: struct exec filhdr;    /* header for a.out files, contains sizes */
        !            31: 
        !            32: /* Initialize files for output and write out the header */
        !            33: rel_header()
        !            34: { 
        !            35:        if ((tout = fopen(rel_name, "w")) == NULL ||
        !            36:            (dout = fopen(rel_name, "a")) == NULL ||
        !            37:            (d1out = fopen(rel_name, "a")) == NULL ||
        !            38:            (d2out = fopen(rel_name, "a")) == NULL)
        !            39:           sys_error("open on output file %s failed", rel_name);
        !            40: 
        !            41:        /* Concat(rname, Source_name, ".tmpr"); */
        !            42:        mktemp( rname );
        !            43:        if ((rtout = fopen(rname, "w")) == NULL
        !            44:           || (rdout = fopen(rname, "a")) == NULL)
        !            45:           sys_error("open on output file %s failed", rname);
        !            46:        filhdr.a_machtype = (ext_instruction_set ? M_68020 : M_68010);
        !            47:        filhdr.a_magic = OMAGIC;
        !            48:        filhdr.a_text = tsize;
        !            49:        filhdr.a_data = dsize+d1size+d2size;
        !            50:        filhdr.a_trsize = rtsize;
        !            51:        filhdr.a_drsize = rdsize;
        !            52:        filhdr.a_bss = bsize;
        !            53:        filhdr.a_entry = 0;
        !            54: 
        !            55:        fseek(tout, 0L, 0);
        !            56:        fwrite(&filhdr, sizeof(filhdr), 1, tout);
        !            57: 
        !            58:        fseek(tout, (long)(N_TXTOFF(filhdr)), 0);   /* seek to start of text */
        !            59:        fseek(dout, (long)(N_TXTOFF(filhdr)+tsize), 0); 
        !            60:        fseek(rdout, rtsize, 0);
        !            61:        fseek(d1out, (long)(N_TXTOFF(filhdr)+tsize+dsize), 0);
        !            62:        fseek(d2out, (long)(N_TXTOFF(filhdr)+tsize+dsize+d1size), 0);
        !            63:        rtsize = 0;
        !            64:        rdsize = 0;
        !            65: 
        !            66: } /* end Rel_Header * /
        !            67: 
        !            68: /*
        !            69:  * Fix_Rel -   Fix up the object file
        !            70:  *     For .b files, we have to
        !            71:  *     1)      append the relocation segments
        !            72:  *     2)      fix up the rtsize and rdsize in the header
        !            73:  *     3)      delete the temporary file for relocation commands
        !            74:  */
        !            75: fix_rel()
        !            76: {
        !            77:        register FILE *fin, *fout;
        !            78:        long ortsize;
        !            79:        long i;
        !            80: #      define FUDGE( x ) ((x)/sizeof(struct reloc))*sizeof(struct relocation_info)
        !            81: 
        !            82:        ortsize = filhdr.a_trsize;
        !            83:        if (ortsize < rtsize ) sys_error("First pass relocation botch\n");
        !            84:        filhdr.a_trsize = FUDGE(rtsize);
        !            85:        if( rflag ){
        !            86:            filhdr.a_trsize += FUDGE(rdsize);
        !            87:            filhdr.a_drsize  = 0;
        !            88:            filhdr.a_text   += filhdr.a_data;
        !            89:            filhdr.a_data    = 0;
        !            90:        } else
        !            91:            filhdr.a_drsize = FUDGE(rdsize);
        !            92:        fclose(rtout);
        !            93:        fclose(rdout);
        !            94:        if ((fin = fopen(rname, "r")) == NULL)
        !            95:           sys_error("cannot reopen relocation file %s", rname);
        !            96: 
        !            97:        fout = tout;
        !            98: 
        !            99:        /* first write text relocation commands */
        !           100:        fseek(fout, (long)(N_TXTOFF(filhdr)+filhdr.a_text+filhdr.a_data), 0);
        !           101:        redosyms();
        !           102:        dorseg(fin,fout,rtsize);
        !           103: 
        !           104:        /* seek to start of data segment relocation commands */
        !           105:        fseek(fin, ortsize, 0);
        !           106:        dorseg(fin,fout,rdsize);
        !           107:        /* Now put the full symbol table out there */
        !           108:        filhdr.a_syms = sym_write(fout);
        !           109: 
        !           110:        /* Now for the string table */
        !           111:        i = str_write(fout);
        !           112:        /* After the table is written, rewrite the length */
        !           113:        fseek(fout,N_STROFF(filhdr),0);
        !           114:        fwrite(&i,sizeof(long),1,fout);
        !           115: 
        !           116:        /* now re-write header */
        !           117:        fseek(fout, 0, 0);
        !           118:        fwrite(&filhdr, sizeof(filhdr), 1, fout);
        !           119:        fclose(fin);
        !           120:        unlink(rname);
        !           121: #      undef FUDGE
        !           122: } /* Fix_Rel */
        !           123: 
        !           124: 
        !           125: dorseg(fin,fout,size)
        !           126:        register size;
        !           127:        FILE *fin,*fout;
        !           128: {
        !           129:        struct reloc new;
        !           130:        while(size) {
        !           131:                size -= sizeof(new);
        !           132:                fread(&new,sizeof(new),1,fin);
        !           133:                if (new.r.r_extern == 1){
        !           134:                   new.r.r_symbolnum = new.rsymbol->final;
        !           135:                } 
        !           136:                fwrite(&new.r ,sizeof(new.r ),1,fout);
        !           137:         } /* end while */
        !           138: } /* end dorseg */
        !           139: 
        !           140: /* rel_val -   Puts value of operand into next bytes of Code
        !           141:  * updating Code_length. Put_Rel is called to handle possible relocation.
        !           142:  * If size=L a longword is stored, otherwise a word is stored 
        !           143:  */
        !           144: rel_val(opnd,size, pcrel)
        !           145:        register struct oper *opnd;
        !           146:        subop_t size;
        !           147: {
        !           148:        register int i;
        !           149:        register struct sym_bkt *sp;
        !           150:        long val;
        !           151:        char *ccode;                    /* char version of this */
        !           152:        union                           /* floating point equivalence */
        !           153:                { 
        !           154:                unsigned short words[6] ;
        !           155:                float f ;
        !           156:                double d ;
        !           157:                /* extended x ; bcdrecord p ; */
        !           158:                }
        !           159:                float_equivalence ;
        !           160: 
        !           161:        i = code_length>>1;     /* get index into WCode */
        !           162:        if (sp = opnd->sym_o)
        !           163:           put_rel(opnd, size, dot + code_length, pcrel);
        !           164:        val = opnd->value_o;
        !           165: /*     /* 
        !           166: /*      * if we're doing pc-relative relocation, we must bias this data
        !           167: /*      * by the negative of its own address. The linker, ld, will add in
        !           168: /*      * the absolute address, then subtract out this assembly's relocation
        !           169: /*      * constant, leaving us with the pc-relative value.
        !           170: /*      */
        !           171: /*     if (pcrel)
        !           172: /*             val -= dot + code_length;
        !           173: */
        !           174:        switch(size) {
        !           175:          case SUBOP_D:         /* Op code specifies double operand. */
        !           176:                switch(opnd->immed_o)
        !           177:                        {
        !           178:                case T_FLOAT :  /* Immediate operand was actually single. */
        !           179:                        float_equivalence.d = (double) opnd->fval_o ;
        !           180:                        break ;
        !           181:                case T_DOUBLE : /* Immediate operand was actually double. */
        !           182:                        float_equivalence.d = (double) opnd->dval_o ;
        !           183:                        break ;
        !           184:                default:        /* Immediate operand was integer. */
        !           185:                        float_equivalence.d = (double) opnd->value_o ;
        !           186:                        break ;
        !           187:                        }
        !           188:                wcode[i++] = float_equivalence.words[0] ;
        !           189:                wcode[i++] = float_equivalence.words[1] ;
        !           190:                wcode[i++] = float_equivalence.words[2] ;
        !           191:                wcode[i++] = float_equivalence.words[3] ;
        !           192:                code_length += 8 ;
        !           193:                break ;
        !           194: 
        !           195:          case SUBOP_S:         /* Op code specifies single operand. */
        !           196:                switch(opnd->immed_o)
        !           197:                        {
        !           198:                case T_FLOAT :  /* Immediate operand was actually single. */
        !           199:                        float_equivalence.f = (float) opnd->fval_o ;
        !           200:                        break ;
        !           201:                case T_DOUBLE : /* Immediate operand was actually double. */
        !           202:                        float_equivalence.f = (float) opnd->dval_o ;
        !           203:                        break ;
        !           204:                default:        /* Immediate operand was integer. */
        !           205:                        float_equivalence.f = (float) opnd->value_o ;
        !           206:                        break ;
        !           207:                        }
        !           208:                wcode[i++] = float_equivalence.words[0] ;
        !           209:                wcode[i++] = float_equivalence.words[1] ;
        !           210:                code_length += 4 ;
        !           211:                break ;
        !           212: 
        !           213:          case SUBOP_L: wcode[i++] = val>>16;
        !           214:                  code_length += 2;
        !           215:                  val &= 0xFFFF;
        !           216:                  /* fall through ... */
        !           217:          case SUBOP_W: 
        !           218:          default:
        !           219:                  if ((short)val > 32767 || (short)val < -32768)
        !           220:                        PROG_ERROR( E_OFFSET );
        !           221:                  wcode[i] = val;
        !           222:                  code_length += 2;
        !           223:                  break;
        !           224:          case SUBOP_B: 
        !           225:                  if ((char)val > 255 || (char)val < -256)
        !           226:                        PROG_ERROR( E_OFFSET );
        !           227:                  ccode = (char *)wcode;
        !           228:                  ccode[code_length++] = val;
        !           229:        }
        !           230: } /* end rel_val */
        !           231: 
        !           232: /* Version of Put_Text which puts whole words, thus enforcing the mapping
        !           233:  * of bytes to words.
        !           234:  */
        !           235: 
        !           236: #ifdef mc68000
        !           237: put_words(code,nbytes)
        !           238:        char *code;
        !           239: {      
        !           240:        if (nbytes & 1) sys_error("Put_Words given odd nbytes=%d\n",nbytes);
        !           241:        put_text(code,nbytes);
        !           242: }
        !           243: #endif
        !           244: 
        !           245: #ifndef mc68000
        !           246: Put_Words(code,nbytes)
        !           247: register char *code;
        !           248: {      register char *cc, ch;
        !           249:        register int i;
        !           250:        char tcode[100];
        !           251: 
        !           252:        cc = tcode;
        !           253:        for (i=0; i<nbytes; i++) tcode[i] = code[i];
        !           254:        i = nbytes>>1;
        !           255:        if (nbytes & 1) Sys_Error("Put_Words given odd nbytes=%d\n",nbytes);
        !           256:        while (i--) { ch = *cc; *cc = cc[1]; *++cc = ch; cc++; }
        !           257:        Put_Text(tcode,nbytes);
        !           258: }
        !           259: #endif
        !           260: 
        !           261: /* Put_Text -  Write out text to proper portion of file */
        !           262: 
        !           263: put_text(code,length)
        !           264:        register char *code;
        !           265: {
        !           266:        if (pass != 2) return;
        !           267:        switch(cur_csect_name){
        !           268:        case C_TEXT:
        !           269:                fwrite(code, length, 1, tout);  break;
        !           270:        case C_DATA:
        !           271:                fwrite(code, length, 1, dout);  break;
        !           272:        case C_DATA1:
        !           273:                fwrite(code, length, 1, d1out); break;
        !           274:        case C_DATA2:
        !           275:                fwrite(code, length, 1, d2out); break;
        !           276:        }
        !           277:        /* else ignore bss segment */
        !           278:  } /* end Put_Text */
        !           279: 
        !           280: 
        !           281: /* set up relocation word for operand:
        !           282:  *  opnd       pointer to operand structure
        !           283:  *  size       0 = byte, 1 = word, 2 = long/address
        !           284:  *  offset     offset into WCode & WReloc array
        !           285:  */
        !           286: 
        !           287: put_rel(opnd, size, offset, pcrel)
        !           288:        struct oper *opnd;
        !           289:        subop_t size;
        !           290:        long offset;
        !           291: {
        !           292:        struct reloc r;
        !           293:        int tz = (rflag)?0:tsize;
        !           294:        if (opnd->sym_o == 0) return;   /* no relocation */
        !           295:        switch( cur_csect_name ){
        !           296:        case C_TEXT:
        !           297:                rtsize += rel_cmd(&r, opnd, size, offset, rtout, pcrel);
        !           298:                break;
        !           299:        case C_DATA:
        !           300:                rdsize += rel_cmd(&r, opnd, size, offset - tz, rdout, pcrel);
        !           301:                break;
        !           302:        case C_DATA1:
        !           303:                        rdsize += rel_cmd(&r, opnd, size, offset - tz, rdout, pcrel);
        !           304:                break;
        !           305:        case C_DATA2:
        !           306:                rdsize += rel_cmd(&r, opnd, size, offset - tz, rdout, pcrel);
        !           307:                break;
        !           308:        }
        !           309:        /* else ignore bss segment */
        !           310: } /* end Put_Rel */
        !           311: 
        !           312: 
        !           313: /* rel_cmd -   Generate a relocation command and output */
        !           314: 
        !           315: rel_cmd(rp, opnd, size, offset, file, pcrel)
        !           316:        register struct reloc* rp;
        !           317:        struct oper *opnd;
        !           318:        subop_t size;
        !           319:        long offset;
        !           320:        FILE *file;
        !           321: { 
        !           322:        register struct sym_bkt *sp;    /* pointer to symbol */
        !           323:        static char zed[ sizeof *rp ] = {0};
        !           324: 
        !           325:        sp = opnd->sym_o;
        !           326:        if (pass == 2) { 
        !           327:                *rp = *(struct reloc *)zed; /* zero the whole structure */
        !           328:                /* rp->r.r_extern = 0; */
        !           329:                if (!(sp->attr_s & S_DEF) && (sp->attr_s & S_EXT)) { 
        !           330:                        rp->r.r_extern = 1;
        !           331:                        rp->rsymbol = sp;
        !           332:                }
        !           333:                else switch( sp->csect_s ){
        !           334:                        case C_TEXT:
        !           335:                                rp->r.r_symbolnum = N_TEXT;
        !           336:                                break;
        !           337:                        default:
        !           338:                                rp->r.r_symbolnum = (rflag)?N_TEXT:N_DATA;
        !           339:                                break;
        !           340:                        case C_BSS:
        !           341:                                rp->r.r_symbolnum = N_BSS;
        !           342:                                break;
        !           343:                        case C_UNDEF:
        !           344:                                prog_error(E_RELOCATE);
        !           345:                        }
        !           346:                rp->r.r_address = offset;
        !           347:                rp->r.r_length = (size==SUBOP_L)?2:(size==SUBOP_B)?0:1;
        !           348:                rp->r.r_pcrel = pcrel;
        !           349:                fwrite(rp, sizeof *rp, 1, file);
        !           350:      }
        !           351:      return(sizeof *rp);
        !           352: }

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