322 lines
7 KiB
C
322 lines
7 KiB
C
/*
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Reading the EM object file
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*/
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/* $Header$ */
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#include <stdio.h>
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#include <local.h> /* for VERSION */
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#include <em_spec.h>
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#include <as_spec.h> /* for as_magic */
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#include "logging.h"
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#include "nofloat.h"
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#include "global.h"
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#include "log.h"
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#include "warn.h"
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#include "mem.h"
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#include "shadow.h"
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#include "read.h"
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#include "text.h"
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#ifndef NOFLOAT
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extern double str2double();
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#endif NOFLOAT
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/************************************************************************
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* Read object file contents. *
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************************************************************************
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* *
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* rd_open() - open object file. *
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* rd_header() - read object file header. *
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* rd_text() - read program text. *
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* rd_gda() - read global data area. *
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* rd_proctab() - read procedure descriptors, *
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* rd_close() - close object file. *
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* *
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************************************************************************/
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/* EM header Part 1 variables */
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int FLAGS;
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/* EM header Part 2 variables */
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size NTEXT;
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size NDATA;
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long NPROC;
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long ENTRY;
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long NLINE;
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size SZDATA;
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PRIVATE FILE *load_fp; /* Filepointer of load file */
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PRIVATE ptr rd_repeat();
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PRIVATE ptr rd_descr();
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PRIVATE int rd_byte();
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PRIVATE long rd_int();
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rd_open(fname)
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char *fname;
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{ /* Open loadfile */
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if ((load_fp = fopen(fname, "r")) == NULL) {
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fatal("Cannot open loadfile '%s'", fname);
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}
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}
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rd_header()
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{
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/* Part 1 */
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if (rd_int(2L) != as_magic)
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fatal("Bad magic number in loadfile");
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FLAGS = rd_int(2L);
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if (rd_int(2L) != 0)
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fatal("Unresolved references in loadfile");
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if (rd_int(2L) != VERSION)
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fatal("Incorrect version number in loadfile");
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/* We only allow the following wordsize/pointersize combinations: */
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/* 2/2, 2/4, 4/4 */
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/* A fatal error will be generated if other combinations occur. */
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wsize = rd_int(2L);
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if (!(wsize == 2 || wsize == 4))
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fatal("Bad wordsize in loadfile");
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dwsize = 2 * wsize; /* set double wordsize */
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wsizem1 = wsize - 1; /* wordsize - 1 used often */
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psize = rd_int(2L);
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if (!(psize == 2 || psize == 4) || psize < wsize)
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fatal("Bad pointersize in loadfile");
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if (2 * psize > FRALimit)
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fatal("FRA maximum size too small");
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rd_int(2L); /* Entry 7 is unused */
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rd_int(2L); /* Entry 8 is unused */
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/* Part 2 */
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NTEXT = rd_int(psize);
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NDATA = rd_int(psize);
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NPROC = rd_int(psize);
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ENTRY = rd_int(psize);
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if (ENTRY < 0 || ENTRY >= NPROC)
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fatal("Bad entry point");
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NLINE = rd_int(psize);
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if (NLINE == 0) {
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warning(WNLINEZR);
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NLINE = I_MAXS4;
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}
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SZDATA = rd_int(psize);
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rd_int(psize); /* entry 7 is unused */
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rd_int(psize); /* entry 8 is unused */
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}
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rd_text()
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{
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fread(text, 1, (int) DB, load_fp);
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}
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rd_gda()
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{
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register int type, prev_type;
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register ptr pos, prev_pos; /* prev_pos invalid if prev_type==0 */
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register long i;
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type = prev_type = 0;
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pos = prev_pos = i2p(0);
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for (i = 1; i <= NDATA; i++) {
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type = btol(rd_byte());
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LOG((" r6 rd_gda(), i = %ld, pos = %u", i, pos));
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if (type == 0) {
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/* repetition descriptor */
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register size count = rd_int(psize);
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LOG((" r6 rd_gda(), case 0: count = %lu", count));
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if (prev_type == 0) {
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fatal("Type 0 initialisation on type 0");
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}
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pos = rd_repeat(pos, count, prev_pos);
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prev_type = 0;
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}
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else {
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/* filling descriptor */
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register size count = btol(rd_byte());
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LOG((" r6 rd_gda(), case %d: count = %lu",
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type, count));
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prev_pos = pos;
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pos = rd_descr(type, count, prev_pos);
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prev_type = type;
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}
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}
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/* now protect the LIN and FIL area */
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dt_prot(i2p(0), (long)LINSIZE);
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dt_prot(i2p(4), psize);
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}
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rd_proctab()
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{
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register long p;
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init_proctab();
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for (p = 0; p < NPROC; p++) {
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register long nloc = rd_int(psize);
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register ptr ep = i2p(rd_int(psize));
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add_proc(nloc, ep);
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}
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end_init_proctab();
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}
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rd_close()
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{
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fclose(load_fp);
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load_fp = 0;
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}
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/************************************************************************
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* Read functions for several types. *
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************************************************************************
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* *
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* rd_repeat() - repeat the previous initialisation *
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* rd_descr() - read a descriptor *
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* rd_byte() - read one byte, return a int. *
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* rd_int(n) - read n byte integer, return a long. *
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* *
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************************************************************************/
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/************************************************************************
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* Reading a floating point number *
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* *
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* A double is 8 bytes, so it can contain 4- and 8-byte (EM) *
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* floating point numbers. That's why a 4-byte floating point *
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* number is also stored in a double. *
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************************************************************************/
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PRIVATE ptr rd_repeat(pos, count, prev_pos)
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ptr pos, prev_pos;
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size count;
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{
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register size diff = pos - prev_pos;
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register size j;
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for (j = 0; j < count; j++) {
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register long i;
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for (i = 0; i < diff; i++) {
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data_loc(pos) = data_loc(pos - diff);
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#ifdef LOGGING
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/* copy shadow byte, including protection bit */
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dt_sh(pos) = dt_sh(pos - diff);
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#endif LOGGING
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pos++;
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}
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}
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return pos;
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}
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PRIVATE ptr rd_descr(type, count, pos)
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int type;
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size count;
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ptr pos;
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{
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register size j;
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char fl_rep[128]; /* fp number representation */
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register int fl_cnt;
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switch (type) {
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case 1: /* m uninitialized words */
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j = count;
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while (j--) {
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dt_stn(pos, 0L, wsize);
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pos += wsize;
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}
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break;
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case 2: /* m initialized bytes */
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j = count;
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while (j--) {
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dt_stn(pos++, btol(rd_byte()), 1L);
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}
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break;
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case 3: /* m initialized wordsize integers */
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for (j = 0; j < count; j++) {
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dt_stn(pos, rd_int(wsize), wsize);
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pos += wsize;
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}
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break;
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case 4: /* m initialized data pointers */
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for (j = 0; j < count; j++) {
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dt_stdp(pos, i2p(rd_int(psize)));
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pos += psize;
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}
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break;
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case 5: /* m initialized instruction pointers */
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for (j = 0; j < count; j++) {
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dt_stip(pos, i2p(rd_int(psize)));
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pos += psize;
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}
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break;
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case 6: /* initialized integer of size m */
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case 7: /* initialized unsigned int of size m */
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if ((j = count) != 1 && j != 2 && j != 4)
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fatal("Bad integersize during initialisation");
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dt_stn(pos, rd_int(j), j);
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pos += j;
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break;
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case 8: /* initialized float of size m */
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if ((j = count) != 4 && j != 8)
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fatal("Bad floatsize during initialisation");
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/* get fp representation */
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fl_cnt = 0;
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while (fl_rep[fl_cnt] = rd_byte()) {
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fl_cnt++;
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if (fl_cnt >= sizeof (fl_rep)) {
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fatal("Initialized float longer than %d chars",
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sizeof (fl_rep));
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}
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}
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#ifndef NOFLOAT
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/* store the float */
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dt_stf(pos, str2double(fl_rep), j);
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#else NOFLOAT
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/* we cannot store the float */
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warning(WFLINIT);
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#endif NOFLOAT
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pos += j;
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break;
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default:
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fatal("Unknown initializer type in global data.");
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break;
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}
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return pos;
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}
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PRIVATE int rd_byte()
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{
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register int i;
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if ((i = fgetc(load_fp)) == EOF)
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fatal("EOF reached during initialization");
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return (i);
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}
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PRIVATE long rd_int(n)
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size n;
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{
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register long l;
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register int i;
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l = btol(rd_byte());
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for (i = 1; i < n; i++) {
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l |= (btol(rd_byte()) << (i*8));
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}
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return (l);
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}
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