b9b808e01a
Adjust platforms to use it. Fix some bugs in the linux386 platform. --HG-- branch : dtrg-experimental-powerpc
470 lines
11 KiB
C
470 lines
11 KiB
C
/*
|
|
* $Source$
|
|
* $State$
|
|
*
|
|
* Simple tool to produce an utterly basic ELF executable
|
|
* from an absolute ack.out file. Suitable for operating
|
|
* systems like Linux.
|
|
*
|
|
* This tool produces an executable with a program header
|
|
* only and no section header.
|
|
*
|
|
* 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 <stdint.h>
|
|
#include <string.h>
|
|
#include "out.h"
|
|
|
|
#define ASSERT(x) switch (2) { case 0: case (x): ; }
|
|
|
|
/* Global settings. */
|
|
|
|
int bigendian = 0;
|
|
int elfabi = 3; /* abi = Linux */
|
|
int elfmachine = 3; /* machine = EM_386 */
|
|
|
|
/* Header and section table of an 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)
|
|
|
|
/* Header and program header table of an ELF object file. */
|
|
|
|
#define ELF_HEADER_SIZE 0x34
|
|
#define PROGRAM_HEADER_SIZE 0x20
|
|
#define PROGRAM_HEADER_COUNT 1
|
|
unsigned long codeoffset;
|
|
|
|
const char elf_le_ident_string[] = {
|
|
0x7F, 'E', 'L', 'F'
|
|
};
|
|
|
|
/* Output file definitions and such */
|
|
|
|
#define HDR_LENGTH 32
|
|
|
|
char hdr[HDR_LENGTH] ;
|
|
|
|
/* Segment numbers understood by aelflod. */
|
|
|
|
enum {
|
|
TEXT = 0,
|
|
ROM,
|
|
DATA,
|
|
BSS,
|
|
NUM_SEGMENTS
|
|
};
|
|
|
|
#define N_EXT 040
|
|
#define N_UNDEF 00
|
|
#define N_ABS 01
|
|
#define N_TEXT 02
|
|
#define N_DATA 03
|
|
#define N_BSS 04
|
|
#define N_FN 037
|
|
|
|
/* 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).
|
|
* b must be a power of two. */
|
|
|
|
long align(long a, long b)
|
|
{
|
|
a += b - 1;
|
|
return a & ~(b-1);
|
|
}
|
|
|
|
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));
|
|
}
|
|
|
|
/* Writes a byte. */
|
|
|
|
void emit8(unsigned char value)
|
|
{
|
|
writef(&value, 1, 1);
|
|
}
|
|
|
|
/* Writes out 16 and 32 bit words in the appropriate endianness. */
|
|
|
|
void emit16(unsigned short value)
|
|
{
|
|
unsigned char buffer[2];
|
|
|
|
if (bigendian)
|
|
{
|
|
buffer[0] = (value >> 8) & 0xFF;
|
|
buffer[1] = (value >> 0) & 0xFF;
|
|
}
|
|
else
|
|
{
|
|
buffer[1] = (value >> 8) & 0xFF;
|
|
buffer[0] = (value >> 0) & 0xFF;
|
|
}
|
|
|
|
writef(buffer, 1, sizeof(buffer));
|
|
}
|
|
|
|
void emit32(unsigned long value)
|
|
{
|
|
unsigned char buffer[4];
|
|
|
|
if (bigendian)
|
|
{
|
|
buffer[0] = (value >> 24) & 0xFF;
|
|
buffer[1] = (value >> 16) & 0xFF;
|
|
buffer[2] = (value >> 8) & 0xFF;
|
|
buffer[3] = (value >> 0) & 0xFF;
|
|
}
|
|
else
|
|
{
|
|
buffer[3] = (value >> 24) & 0xFF;
|
|
buffer[2] = (value >> 16) & 0xFF;
|
|
buffer[1] = (value >> 8) & 0xFF;
|
|
buffer[0] = (value >> 0) & 0xFF;
|
|
}
|
|
|
|
writef(buffer, 1, sizeof(buffer));
|
|
}
|
|
|
|
/* Copies the contents of a section from the input stream
|
|
* to the output stream. */
|
|
|
|
void emits(struct outsect* section)
|
|
{
|
|
char buffer[BUFSIZ];
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Writes out an ELF program header. */
|
|
|
|
void emitphdr(unsigned long address, unsigned long filesize,
|
|
unsigned int memsize, unsigned int alignment, int flags)
|
|
{
|
|
static unsigned long fileoffset = 0;
|
|
|
|
emit32(1); /* type = PT_LOAD */
|
|
emit32(fileoffset); /* file offset */
|
|
emit32(address); /* virtual address */
|
|
emit32(0); /* physical address */
|
|
emit32(filesize); /* file size */
|
|
emit32(memsize); /* memory size */
|
|
emit32(flags); /* executable, readable, writable */
|
|
emit32(alignment); /* alignment */
|
|
|
|
fileoffset += filesize;
|
|
}
|
|
|
|
/* 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 'a':
|
|
elfabi = atoi(&argv[1][2]);
|
|
break;
|
|
|
|
case 'b':
|
|
bigendian = 1;
|
|
break;
|
|
|
|
case 'h':
|
|
fprintf(stderr, "%s: Syntax: aelflod [-a<number>] [-b] [-h] [-l]\n\t[-m<number>] <inputfile> <outputfile>\n",
|
|
program);
|
|
exit(0);
|
|
|
|
case 'l':
|
|
bigendian = 0;
|
|
break;
|
|
|
|
case 'm':
|
|
elfmachine = atoi(&argv[1][2]);
|
|
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");
|
|
}
|
|
|
|
/* Ensure the base address doesn't overlap the file header. */
|
|
|
|
codeoffset = outsect[TEXT].os_base & 0x1FFF;
|
|
if (codeoffset < (ELF_HEADER_SIZE + PROGRAM_HEADER_SIZE*PROGRAM_HEADER_COUNT))
|
|
fatal("base address too small --- overlaps ELF header");
|
|
|
|
/* Rationalise the memory sizes. */
|
|
|
|
outsect[TEXT].os_size = outsect[ROM ].os_base - outsect[TEXT].os_base;
|
|
outsect[ROM ].os_size = outsect[DATA].os_base - outsect[ROM ].os_base;
|
|
outsect[DATA].os_size = outsect[BSS ].os_base - outsect[DATA].os_base;
|
|
outsect[BSS ].os_size = align(outsect[BSS].os_size, outsect[BSS].os_lign);
|
|
|
|
/* Write out the ELF file header. */
|
|
|
|
writef(elf_le_ident_string, 4, 1);
|
|
emit8(1); /* class = ELFCLASS32 */
|
|
emit8(bigendian ? 2 : 1); /* endianness */
|
|
emit8(1); /* ELF version */
|
|
emit8(elfabi); /* ABI */
|
|
emit8(0); /* ABI version */
|
|
emit8(0); emit16(0); /* padding... */
|
|
emit32(0); /* ...to offset 0x10 */
|
|
|
|
emit16(2); /* type = ET_EXEC */
|
|
emit16(elfmachine); /* machine */
|
|
emit32(1); /* ELF version again */
|
|
emit32(outsect[TEXT].os_base); /* entry point */
|
|
emit32(ELF_HEADER_SIZE); /* program header offset */
|
|
emit32(0); /* section header offset */
|
|
emit32(0); /* flags */
|
|
emit16(ELF_HEADER_SIZE); /* elf header size */
|
|
emit16(PROGRAM_HEADER_SIZE); /* program header entry size */
|
|
emit16(1); /* number of program header entries */
|
|
emit16(0x28); /* section header entry size */
|
|
emit16(0); /* number of section header entries */
|
|
emit16(0); /* section header string table index = SHN_UNDEF */
|
|
|
|
/* Write out a single rwx section for the entire program. */
|
|
|
|
{
|
|
unsigned long filelength = codeoffset +
|
|
outsect[TEXT].os_size +
|
|
outsect[ROM].os_size +
|
|
outsect[DATA].os_size;
|
|
|
|
unsigned long memlength = filelength +
|
|
outsect[BSS].os_size;
|
|
|
|
emitphdr(outsect[TEXT].os_base & ~0x1FFF, filelength, memlength,
|
|
0, 4|2|1);
|
|
}
|
|
|
|
/* Write padding until the code start. */
|
|
|
|
fseek(output, codeoffset, SEEK_SET);
|
|
|
|
/* Write out the actual data. */
|
|
|
|
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. */
|
|
|
|
{
|
|
long ss = 0;
|
|
printf(" address length\n");
|
|
printf(" ehdr : %08lX %08lX\n", outsect[TEXT].os_base & ~0x1FFF, codeoffset);
|
|
printf(" text : %08lX %08lX\n", outsect[TEXT].os_base, outsect[TEXT].os_size);
|
|
printf(" rom : %08lX %08lX\n", outsect[ROM].os_base, outsect[ROM].os_size);
|
|
printf(" data : %08lX %08lX\n", outsect[DATA].os_base, outsect[DATA].os_size);
|
|
printf(" bss : %08lX %08lX\n", outsect[BSS].os_base, 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 : %08lX\n", ss);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|