b9b808e01a
Adjust platforms to use it. Fix some bugs in the linux386 platform. --HG-- branch : dtrg-experimental-powerpc
471 lines
11 KiB
C
471 lines
11 KiB
C
/*
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* $Source$
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* $State$
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*
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* Simple tool to produce an utterly basic ELF executable
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* from an absolute ack.out file. Suitable for operating
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* systems like Linux.
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*
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* This tool produces an executable with a program header
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* only and no section header.
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*
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* Mostly pinched from the ARM cv (and then rewritten in
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* ANSI C). Which, according to the comment, was pinched
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* from m68k2; therefore I am merely continuing a time-
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* honoured tradition.
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*
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* (I was 10 when the original for this was checked into
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* CVS...)
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*
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* dtrg, 2006-10-17
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdint.h>
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#include <string.h>
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#include "out.h"
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#define ASSERT(x) switch (2) { case 0: case (x): ; }
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/* Global settings. */
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int bigendian = 0;
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int elfabi = 3; /* abi = Linux */
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int elfmachine = 3; /* machine = EM_386 */
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/* Header and section table of an ack object file. */
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struct outhead outhead;
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struct outsect outsect[S_MAX];
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char* stringarea;
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char* outputfile = NULL; /* Name of output file, or NULL */
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char* program; /* Name of current program: argv[0] */
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FILE* input; /* Input stream */
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FILE* output; /* Output stream */
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#define readf(a, b, c) fread((a), (b), (int)(c), input)
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#define writef(a, b, c) fwrite((a), (b), (int)(c), output)
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/* Header and program header table of an ELF object file. */
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#define ELF_HEADER_SIZE 0x34
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#define PROGRAM_HEADER_SIZE 0x20
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#define PROGRAM_HEADER_COUNT 1
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unsigned long codeoffset;
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const char elf_le_ident_string[] = {
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0x7F, 'E', 'L', 'F'
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};
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/* Output file definitions and such */
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#define HDR_LENGTH 32
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char hdr[HDR_LENGTH] ;
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/* Segment numbers understood by aelflod. */
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enum {
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TEXT = 0,
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ROM,
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DATA,
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BSS,
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NUM_SEGMENTS
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};
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#define N_EXT 040
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#define N_UNDEF 00
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#define N_ABS 01
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#define N_TEXT 02
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#define N_DATA 03
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#define N_BSS 04
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#define N_FN 037
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/* Produce an error message and exit. */
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void fatal(const char* s, ...)
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{
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va_list ap;
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fprintf(stderr, "%s: ",program) ;
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va_start(ap, s);
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vfprintf(stderr, s, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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if (outputfile)
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unlink(outputfile);
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exit(1);
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}
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/* Calculate the result of a aligned to b (rounding up if necessary).
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* b must be a power of two. */
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long align(long a, long b)
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{
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a += b - 1;
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return a & ~(b-1);
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}
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int follows(struct outsect* pa, struct outsect* pb)
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{
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/* return 1 if pa follows pb */
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return (pa->os_base >= align(pb->os_base+pb->os_size, pa->os_lign));
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}
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/* Writes a byte. */
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void emit8(unsigned char value)
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{
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writef(&value, 1, 1);
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}
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/* Writes out 16 and 32 bit words in the appropriate endianness. */
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void emit16(unsigned short value)
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{
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unsigned char buffer[2];
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if (bigendian)
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{
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buffer[0] = (value >> 8) & 0xFF;
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buffer[1] = (value >> 0) & 0xFF;
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}
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else
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{
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buffer[1] = (value >> 8) & 0xFF;
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buffer[0] = (value >> 0) & 0xFF;
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}
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writef(buffer, 1, sizeof(buffer));
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}
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void emit32(unsigned long value)
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{
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unsigned char buffer[4];
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if (bigendian)
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{
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buffer[0] = (value >> 24) & 0xFF;
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buffer[1] = (value >> 16) & 0xFF;
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buffer[2] = (value >> 8) & 0xFF;
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buffer[3] = (value >> 0) & 0xFF;
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}
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else
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{
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buffer[3] = (value >> 24) & 0xFF;
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buffer[2] = (value >> 16) & 0xFF;
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buffer[1] = (value >> 8) & 0xFF;
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buffer[0] = (value >> 0) & 0xFF;
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}
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writef(buffer, 1, sizeof(buffer));
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}
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/* Copies the contents of a section from the input stream
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* to the output stream. */
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void emits(struct outsect* section)
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{
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char buffer[BUFSIZ];
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long n = section->os_flen;
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while (n > 0)
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{
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int blocksize = (n > BUFSIZ) ? BUFSIZ : n;
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readf(buffer, 1, blocksize);
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writef(buffer, 1, blocksize);
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n -= blocksize;
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}
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/* Zero fill any remaining space. */
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if (section->os_flen != section->os_size)
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{
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long n = section->os_size - section->os_flen;
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memset(buffer, 0, BUFSIZ);
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while (n > 0)
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{
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int blocksize = (n > BUFSIZ) ? BUFSIZ : n;
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writef(buffer, 1, blocksize);
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n -= blocksize;
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}
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}
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}
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/* Writes out an ELF program header. */
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void emitphdr(unsigned long address, unsigned long filesize,
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unsigned int memsize, unsigned int alignment, int flags)
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{
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static unsigned long fileoffset = 0;
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emit32(1); /* type = PT_LOAD */
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emit32(fileoffset); /* file offset */
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emit32(address); /* virtual address */
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emit32(0); /* physical address */
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emit32(filesize); /* file size */
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emit32(memsize); /* memory size */
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emit32(flags); /* executable, readable, writable */
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emit32(alignment); /* alignment */
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fileoffset += filesize;
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}
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/* Macros from modules/src/object/obj.h */
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#define Xchar(ch) ((ch) & 0377)
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#define uget2(c) (Xchar((c)[0]) | ((unsigned) Xchar((c)[1]) << 8))
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#define get4(c) (uget2(c) | ((long) uget2((c)+2) << 16))
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/* Read the ack.out file header. */
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int rhead(FILE* f, struct outhead* head)
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{
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char buf[SZ_HEAD], *c;
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if (fread(buf, sizeof(buf), 1, f) != 1)
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return 0;
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c = buf;
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head->oh_magic = uget2(c); c += 2;
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head->oh_stamp = uget2(c); c += 2;
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head->oh_flags = uget2(c); c += 2;
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head->oh_nsect = uget2(c); c += 2;
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head->oh_nrelo = uget2(c); c += 2;
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head->oh_nname = uget2(c); c += 2;
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head->oh_nemit = get4(c); c += 4;
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head->oh_nchar = get4(c);
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return 1;
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}
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/* Read an ack.out section header. */
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int rsect(FILE* f, struct outsect* sect)
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{
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char buf[SZ_SECT], *c;
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if (fread(buf, sizeof(buf), 1, f) != 1)
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return 0;
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c = buf;
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sect->os_base = get4(c); c += 4;
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sect->os_size = get4(c); c += 4;
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sect->os_foff = get4(c); c += 4;
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sect->os_flen = get4(c); c += 4;
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sect->os_lign = get4(c);
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return 1 ;
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}
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int main(int argc, char* argv[])
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{
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/* General housecleaning and setup. */
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input = stdin;
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output = stdout;
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program = argv[0];
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/* Read in and process any flags. */
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while ((argc > 1) && (argv[1][0] == '-'))
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{
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switch (argv[1][1])
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{
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case 'a':
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elfabi = atoi(&argv[1][2]);
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break;
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case 'b':
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bigendian = 1;
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break;
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case 'h':
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fprintf(stderr, "%s: Syntax: aelflod [-a<number>] [-b] [-h] [-l]\n\t[-m<number>] <inputfile> <outputfile>\n",
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program);
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exit(0);
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case 'l':
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bigendian = 0;
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break;
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case 'm':
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elfmachine = atoi(&argv[1][2]);
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break;
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default:
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syntaxerror:
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fatal("syntax error --- try -h for help");
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}
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argv++;
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argc--;
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}
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/* Process the rest of the arguments. */
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switch (argc)
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{
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case 1: /* No parameters --- read from stdin, write to stdout. */
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break;
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case 3: /* Both input and output files specified. */
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output = fopen(argv[2], "w");
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if (!output)
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fatal("unable to open output file.");
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outputfile = argv[2];
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/* fall through */
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case 2: /* Input file specified. */
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input = fopen(argv[1], "r");
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if (!input)
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fatal("unable to open input file.");
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break;
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default:
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goto syntaxerror;
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}
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/* Read and check the ack.out file header. */
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if (!rhead(input,&outhead))
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fatal("failed to read file header.");
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if (BADMAGIC(outhead))
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fatal("this isn't an ack object file.");
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if (outhead.oh_nrelo > 0)
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fprintf(stderr, "Warning: relocation information present.");
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if (!((outhead.oh_nsect == NUM_SEGMENTS) ||
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(outhead.oh_nsect == (NUM_SEGMENTS+1))))
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fatal("the input file must have %d sections, not %ld.",
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NUM_SEGMENTS, outhead.oh_nsect);
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/* Read in the section headers. */
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{
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int i;
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for (i=0; i<outhead.oh_nsect; i++)
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{
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if (!rsect(input, &outsect[i]))
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fatal("failed to read section header %d.", i);
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}
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}
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/* A few checks */
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if (outsect[BSS].os_flen != 0)
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fatal("the bss space contains initialized data.");
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if (!follows(&outsect[BSS], &outsect[DATA]))
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fatal("the bss segment must follow the data segment.");
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if (!follows(& outsect[ROM], &outsect[TEXT]))
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fatal("the rom segment must follow the text segment.");
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if (!follows(&outsect[DATA], &outsect[ROM]))
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fatal("the data segment must follow the rom segment.") ;
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/* Check for an optional end segment (which is otherwise
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* ignored). */
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if (outhead.oh_nsect == (NUM_SEGMENTS+1))
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{
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if (!follows(&outsect[NUM_SEGMENTS], &outsect[BSS]))
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fatal("end segment must follow bss");
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if ( outsect[NUM_SEGMENTS].os_size != 0 )
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fatal("end segment must be empty");
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}
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/* Ensure the base address doesn't overlap the file header. */
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codeoffset = outsect[TEXT].os_base & 0x1FFF;
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if (codeoffset < (ELF_HEADER_SIZE + PROGRAM_HEADER_SIZE*PROGRAM_HEADER_COUNT))
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fatal("base address too small --- overlaps ELF header");
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/* Rationalise the memory sizes. */
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outsect[TEXT].os_size = outsect[ROM ].os_base - outsect[TEXT].os_base;
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outsect[ROM ].os_size = outsect[DATA].os_base - outsect[ROM ].os_base;
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outsect[DATA].os_size = outsect[BSS ].os_base - outsect[DATA].os_base;
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outsect[BSS ].os_size = align(outsect[BSS].os_size, outsect[BSS].os_lign);
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/* Write out the ELF file header. */
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writef(elf_le_ident_string, 4, 1);
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emit8(1); /* class = ELFCLASS32 */
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emit8(bigendian ? 2 : 1); /* endianness */
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emit8(1); /* ELF version */
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emit8(elfabi); /* ABI */
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emit8(0); /* ABI version */
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emit8(0); emit16(0); /* padding... */
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emit32(0); /* ...to offset 0x10 */
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emit16(2); /* type = ET_EXEC */
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emit16(elfmachine); /* machine */
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emit32(1); /* ELF version again */
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emit32(outsect[TEXT].os_base); /* entry point */
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emit32(ELF_HEADER_SIZE); /* program header offset */
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emit32(0); /* section header offset */
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emit32(0); /* flags */
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emit16(ELF_HEADER_SIZE); /* elf header size */
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emit16(PROGRAM_HEADER_SIZE); /* program header entry size */
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emit16(1); /* number of program header entries */
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emit16(0x28); /* section header entry size */
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emit16(0); /* number of section header entries */
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emit16(0); /* section header string table index = SHN_UNDEF */
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/* Write out a single rwx section for the entire program. */
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{
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unsigned long filelength = codeoffset +
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outsect[TEXT].os_size +
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outsect[ROM].os_size +
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outsect[DATA].os_size;
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unsigned long memlength = filelength +
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outsect[BSS].os_size;
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emitphdr(outsect[TEXT].os_base & ~0x1FFF, filelength, memlength,
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0, 4|2|1);
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}
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/* Write padding until the code start. */
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fseek(output, codeoffset, SEEK_SET);
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/* Write out the actual data. */
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emits(&outsect[TEXT]);
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emits(&outsect[ROM]);
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emits(&outsect[DATA]);
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if (ferror(output))
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fatal("output write error");
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if (outputfile)
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chmod(outputfile, 0755);
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/* Summarise what we've done. */
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{
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long ss = 0;
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printf(" address length\n");
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printf(" ehdr : %08lX %08lX\n", outsect[TEXT].os_base & ~0x1FFF, codeoffset);
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printf(" text : %08lX %08lX\n", outsect[TEXT].os_base, outsect[TEXT].os_size);
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printf(" rom : %08lX %08lX\n", outsect[ROM].os_base, outsect[ROM].os_size);
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printf(" data : %08lX %08lX\n", outsect[DATA].os_base, outsect[DATA].os_size);
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printf(" bss : %08lX %08lX\n", outsect[BSS].os_base, outsect[BSS].os_size);
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ss += outsect[TEXT].os_size;
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ss += outsect[ROM].os_size;
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ss += outsect[DATA].os_size;
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ss += outsect[BSS].os_size;
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printf("TOTAL : %08lX\n", ss);
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}
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return 0;
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}
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