/*
* Simple tool to produce a memory dump for an absolute
* ack.out file. Suitable for noddy operating systems
* like DOS, CP/M, Arthur, etc. Also useful for RAM
* images (but *not* ROM images, note) and, more
* importantly, general test purposes.
*
* Mostly pinched from the ARM cv (and then rewritten in
* ANSI C). Which, according to the comment, was pinched
* from m68k2; therefore I am merely continuing a time-
* honoured tradition.
*
* (I was 10 when the original for this was checked into
* CVS...)
*
* dtrg, 2006-10-17
*/
#include <stdlib.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdbool.h>
#include <string.h>
#include <inttypes.h>
#include <unistd.h>
#include <sys/stat.h>
#include "out.h"
#define ASSERT(x) switch (2) { case 0: case (x): ; }
/*
* Header and section table of ack object file.
*/
struct outhead outhead;
struct outsect outsect[S_MAX];
char* stringarea;
char* outputfile = NULL; /* Name of output file, or NULL */
char* program; /* Name of current program: argv[0] */
FILE* input; /* Input stream */
FILE* output; /* Output stream */
#define readf(a, b, c) fread((a), (b), (int)(c), input)
#define writef(a, b, c) fwrite((a), (b), (int)(c), output)
bool verbose = false;
/* Segment numbers understood by aslod. */
enum {
TEXT = 0,
ROM,
DATA,
BSS,
NUM_SEGMENTS
};
/* Produce an error message and exit. */
void fatal(const char* s, ...)
{
va_list ap;
fprintf(stderr, "%s: ",program) ;
va_start(ap, s);
vfprintf(stderr, s, ap);
va_end(ap);
fprintf(stderr, "\n");
if (outputfile)
unlink(outputfile);
exit(1);
}
/* Calculate the result of a aligned to b (rounding up if necessary). */
long align(long a, long b)
{
a += b - 1;
return a - a % b;
}
int follows(struct outsect* pa, struct outsect* pb)
{
/* return 1 if pa follows pb */
return (pa->os_base == align(pb->os_base+pb->os_size, pa->os_lign));
}
/* Copies the contents of a section from the input stream
* to the output stream, zero filling any uninitialised
* space. */
void emits(struct outsect* section)
{
char buffer[BUFSIZ];
/* Copy the actual data. */
{
long n = section->os_flen;
while (n > 0)
{
int blocksize = (n > BUFSIZ) ? BUFSIZ : n;
readf(buffer, 1, blocksize);
writef(buffer, 1, blocksize);
n -= blocksize;
}
}
/* Zero fill any remaining space. */
if (section->os_flen != section->os_size)
{
long n = section->os_size - section->os_flen;
memset(buffer, 0, BUFSIZ);
while (n > 0)
{
int blocksize = (n > BUFSIZ) ? BUFSIZ : n;
writef(buffer, 1, blocksize);
n -= blocksize;
}
}
}
/* Macros from modules/src/object/obj.h */
#define Xchar(ch) ((ch) & 0377)
#define uget2(c) (Xchar((c)[0]) | ((unsigned) Xchar((c)[1]) << 8))
#define get4(c) (uget2(c) | ((long) uget2((c)+2) << 16))
/* Read the ack.out file header. */
int rhead(FILE* f, struct outhead* head)
{
char buf[SZ_HEAD], *c;
if (fread(buf, sizeof(buf), 1, f) != 1)
return 0;
c = buf;
head->oh_magic = uget2(c); c += 2;
head->oh_stamp = uget2(c); c += 2;
head->oh_flags = uget2(c); c += 2;
head->oh_nsect = uget2(c); c += 2;
head->oh_nrelo = uget2(c); c += 2;
head->oh_nname = uget2(c); c += 2;
head->oh_nemit = get4(c); c += 4;
head->oh_nchar = get4(c);
return 1;
}
/* Read an ack.out section header. */
int rsect(FILE* f, struct outsect* sect)
{
char buf[SZ_SECT], *c;
if (fread(buf, sizeof(buf), 1, f) != 1)
return 0;
c = buf;
sect->os_base = get4(c); c += 4;
sect->os_size = get4(c); c += 4;
sect->os_foff = get4(c); c += 4;
sect->os_flen = get4(c); c += 4;
sect->os_lign = get4(c);
return 1 ;
}
int main(int argc, char* argv[])
{
/* General housecleaning and setup. */
input = stdin;
output = stdout;
program = argv[0];
/* Read in and process any flags. */
while ((argc > 1) && (argv[1][0] == '-'))
{
switch (argv[1][1])
{
case 'h':
fprintf(stderr, "%s: Syntax: aslod [-h] <inputfile> <outputfile>\n",
program);
exit(0);
case 'v':
verbose = true;
break;
default:
syntaxerror:
fatal("syntax error --- try -h for help");
}
argv++;
argc--;
}
/* Process the rest of the arguments. */
switch (argc)
{
case 1: /* No parameters --- read from stdin, write to stdout. */
break;
case 3: /* Both input and output files specified. */
output = fopen(argv[2], "w");
if (!output)
fatal("unable to open output file.");
outputfile = argv[2];
/* fall through */
case 2: /* Input file specified. */
input = fopen(argv[1], "r");
if (!input)
fatal("unable to open input file.");
break;
default:
goto syntaxerror;
}
/* Read and check the ack.out file header. */
if (!rhead(input,&outhead))
fatal("failed to read file header.");
if (BADMAGIC(outhead))
fatal("this isn't an ack object file.");
if (outhead.oh_nrelo > 0)
fprintf(stderr, "Warning: relocation information present.");
if (!((outhead.oh_nsect == NUM_SEGMENTS) ||
(outhead.oh_nsect == (NUM_SEGMENTS+1))))
fatal("the input file must have %d sections, not %ld.",
NUM_SEGMENTS, outhead.oh_nsect);
/* Read in the section headers. */
{
int i;
for (i=0; i<outhead.oh_nsect; i++)
{
if (!rsect(input, &outsect[i]))
fatal("failed to read section header %d.", i);
}
}
/* A few checks */
if (outsect[BSS].os_flen != 0)
fatal("the bss space contains initialized data.");
if (!follows(&outsect[BSS], &outsect[DATA]))
fatal("the bss segment must follow the data segment.");
if (!follows(& outsect[ROM], &outsect[TEXT]))
fatal("the rom segment must follow the text segment.");
if (!follows(&outsect[DATA], &outsect[ROM]))
fatal("the data segment must follow the rom segment.") ;
/* Check for an optional end segment (which is otherwise
* ignored). */
if (outhead.oh_nsect == (NUM_SEGMENTS+1))
{
if (!follows(&outsect[NUM_SEGMENTS], &outsect[BSS]))
fatal("end segment must follow bss");
if ( outsect[NUM_SEGMENTS].os_size != 0 )
fatal("end segment must be empty");
}
/* And go! */
emits(&outsect[TEXT]);
emits(&outsect[ROM]);
emits(&outsect[DATA]);
if (ferror(output))
fatal("output write error");
if (outputfile)
chmod(outputfile, 0755);
/* Summarise what we've done. */
if (verbose)
{
uint32_t ss = 0;
printf(" base : %08"PRIx32"\n", outsect[TEXT].os_base) ;
printf(" text = %08"PRIx32"\n", outsect[TEXT].os_size);
printf(" rom = %08"PRIx32"\n", outsect[ROM].os_size);
printf(" data = %08"PRIx32"\n", outsect[DATA].os_size);
printf(" bss = %08"PRIx32"\n", outsect[BSS].os_size);
ss += outsect[TEXT].os_size;
ss += outsect[ROM].os_size;
ss += outsect[DATA].os_size;
ss += outsect[BSS].os_size;
printf("TOTAL = %08"PRIx32"\n", ss);
}
return 0;
}