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/****************************************************************************/
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* QEMU bFLT binary loader. Based on linux/fs/binfmt_flat.c
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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* Copyright (C) 2006 CodeSourcery.
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* Copyright (C) 2000-2003 David McCullough <davidm@snapgear.com>
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* Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
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* Copyright (C) 2002 SnapGear, by Paul Dale <pauli@snapgear.com>
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* Copyright (C) 2000, 2001 Lineo, by David McCullough <davidm@lineo.com>
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* linux/fs/binfmt_aout.c:
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* Copyright (C) 1991, 1992, 1996 Linus Torvalds
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* linux/fs/binfmt_flat.c for 2.0 kernel
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
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* JAN/99 -- coded full program relocation (gerg@snapgear.com)
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/* ??? ZFLAT and shared library support is currently disabled. */
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/****************************************************************************/
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#define ntohl(x) be32_to_cpu(x)
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#include <target_flat.h>
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#define DBG_FLT(...) printf(__VA_ARGS__)
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#define RELOC_FAILED 0xff00ff01 /* Relocation incorrect somewhere */
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#define UNLOADED_LIB 0x7ff000ff /* Placeholder for unused library */
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abi_ulong start_code; /* Start of text segment */
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abi_ulong start_data; /* Start of data segment */
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abi_ulong end_data; /* Start of bss section */
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abi_ulong start_brk; /* End of data segment */
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abi_ulong text_len; /* Length of text segment */
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abi_ulong entry; /* Start address for this module */
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abi_ulong build_date; /* When this one was compiled */
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short loaded; /* Has this library been loaded? */
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#ifdef CONFIG_BINFMT_SHARED_FLAT
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static int load_flat_shared_library(int id, struct lib_info *p);
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/****************************************************************************/
77
* create_flat_tables() parses the env- and arg-strings in new user
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* memory and creates the pointer tables from them, and puts their
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* addresses on the "stack", returning the new stack pointer value.
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/* Push a block of strings onto the guest stack. */
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static abi_ulong copy_strings(abi_ulong p, int n, char **s)
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len = strlen(s[n]) + 1;
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memcpy_to_target(p, s[n], len);
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static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
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buf = lock_user(VERIFY_WRITE, ptr, len, 0);
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ret = pread(fd, buf, len, offset);
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unlock_user(buf, ptr, len);
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/****************************************************************************/
109
#ifdef CONFIG_BINFMT_ZFLAT
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#include <linux/zlib.h>
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#define LBUFSIZE 4000
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
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#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
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#define RESERVED 0xC0 /* bit 6,7: reserved */
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static int decompress_exec(
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struct linux_binprm *bprm,
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unsigned long offset,
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DBG_FLT("decompress_exec(offset=%x,buf=%x,len=%x)\n",(int)offset, (int)dst, (int)len);
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memset(&strm, 0, sizeof(strm));
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strm.workspace = kmalloc(zlib_inflate_workspacesize(), GFP_KERNEL);
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if (strm.workspace == NULL) {
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DBG_FLT("binfmt_flat: no memory for decompress workspace\n");
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buf = kmalloc(LBUFSIZE, GFP_KERNEL);
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DBG_FLT("binfmt_flat: no memory for read buffer\n");
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/* Read in first chunk of data and parse gzip header. */
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ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
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/* Check minimum size -- gzip header */
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DBG_FLT("binfmt_flat: file too small?\n");
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/* Check gzip magic number */
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if ((buf[0] != 037) || ((buf[1] != 0213) && (buf[1] != 0236))) {
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DBG_FLT("binfmt_flat: unknown compression magic?\n");
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/* Check gzip method */
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DBG_FLT("binfmt_flat: unknown compression method?\n");
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/* Check gzip flags */
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if ((buf[3] & ENCRYPTED) || (buf[3] & CONTINUATION) ||
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(buf[3] & RESERVED)) {
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DBG_FLT("binfmt_flat: unknown flags?\n");
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if (buf[3] & EXTRA_FIELD) {
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ret += 2 + buf[10] + (buf[11] << 8);
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if (unlikely(LBUFSIZE == ret)) {
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DBG_FLT("binfmt_flat: buffer overflow (EXTRA)?\n");
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if (buf[3] & ORIG_NAME) {
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for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
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if (unlikely(LBUFSIZE == ret)) {
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DBG_FLT("binfmt_flat: buffer overflow (ORIG_NAME)?\n");
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if (buf[3] & COMMENT) {
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for (; ret < LBUFSIZE && (buf[ret] != 0); ret++)
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if (unlikely(LBUFSIZE == ret)) {
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DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n");
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strm.avail_in -= ret;
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strm.avail_out = len;
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if (zlib_inflateInit2(&strm, -MAX_WBITS) != Z_OK) {
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DBG_FLT("binfmt_flat: zlib init failed?\n");
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while ((ret = zlib_inflate(&strm, Z_NO_FLUSH)) == Z_OK) {
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ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos);
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if (ret >= (unsigned long) -4096)
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DBG_FLT("binfmt_flat: decompression failed (%d), %s\n",
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zlib_inflateEnd(&strm);
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kfree(strm.workspace);
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#endif /* CONFIG_BINFMT_ZFLAT */
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/****************************************************************************/
257
calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
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abi_ulong start_data;
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abi_ulong start_code;
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#ifdef CONFIG_BINFMT_SHARED_FLAT
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#error needs checking
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id = curid; /* Relocs of 0 are always self referring */
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id = (r >> 24) & 0xff; /* Find ID for this reloc */
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r &= 0x00ffffff; /* Trim ID off here */
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if (id >= MAX_SHARED_LIBS) {
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fprintf(stderr, "BINFMT_FLAT: reference 0x%x to shared library %d\n",
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fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not "
282
"in same module (%d != %d)\n",
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(unsigned) r, curid, id);
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} else if ( ! p[id].loaded &&
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load_flat_shared_library(id, p) > (unsigned long) -4096) {
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fprintf(stderr, "BINFMT_FLAT: failed to load library %d\n", id);
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/* Check versioning information (i.e. time stamps) */
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if (p[id].build_date && p[curid].build_date
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&& p[curid].build_date < p[id].build_date) {
293
fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n",
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start_brk = p[id].start_brk;
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start_data = p[id].start_data;
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start_code = p[id].start_code;
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text_len = p[id].text_len;
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if (!flat_reloc_valid(r, start_brk - start_data + text_len)) {
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fprintf(stderr, "BINFMT_FLAT: reloc outside program 0x%x "
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(int) r,(int)(start_brk-start_code),(int)text_len);
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if (r < text_len) /* In text segment */
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addr = r + start_code;
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else /* In data segment */
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addr = r - text_len + start_data;
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/* Range checked already above so doing the range tests is redundant...*/
327
/****************************************************************************/
329
/* ??? This does not handle endianness correctly. */
330
static void old_reloc(struct lib_info *libinfo, uint32_t rl)
333
const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
339
offset = rl & 0x3fffffff;
340
reloc_type = rl >> 30;
341
/* ??? How to handle this? */
342
#if defined(CONFIG_COLDFIRE)
343
ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
345
ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
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fprintf(stderr, "Relocation of variable at DATASEG+%x "
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"(address %p, currently %x) into segment %s\n",
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offset, ptr, (int)*ptr, segment[reloc_type]);
354
switch (reloc_type) {
355
case OLD_FLAT_RELOC_TYPE_TEXT:
356
*ptr += libinfo->start_code;
358
case OLD_FLAT_RELOC_TYPE_DATA:
359
*ptr += libinfo->start_data;
361
case OLD_FLAT_RELOC_TYPE_BSS:
362
*ptr += libinfo->end_data;
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fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
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DBG_FLT("Relocation became %x\n", (int)*ptr);
372
/****************************************************************************/
374
static int load_flat_file(struct linux_binprm * bprm,
375
struct lib_info *libinfo, int id, abi_ulong *extra_stack)
377
struct flat_hdr * hdr;
378
abi_ulong textpos = 0, datapos = 0;
380
abi_ulong realdatastart = 0;
381
abi_ulong text_len, data_len, bss_len, stack_len, flags;
383
abi_ulong reloc = 0, rp;
384
int i, rev, relocs = 0;
386
abi_ulong start_code;
389
hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
391
text_len = ntohl(hdr->data_start);
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data_len = ntohl(hdr->data_end) - ntohl(hdr->data_start);
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bss_len = ntohl(hdr->bss_end) - ntohl(hdr->data_end);
394
stack_len = ntohl(hdr->stack_size);
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stack_len += *extra_stack;
397
*extra_stack = stack_len;
399
relocs = ntohl(hdr->reloc_count);
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flags = ntohl(hdr->flags);
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rev = ntohl(hdr->rev);
403
DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
405
if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
406
fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
407
rev, (int) FLAT_VERSION);
411
/* Don't allow old format executables to use shared libraries */
412
if (rev == OLD_FLAT_VERSION && id != 0) {
413
fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
418
* fix up the flags for the older format, there were all kinds
419
* of endian hacks, this only works for the simple cases
421
if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
422
flags = FLAT_FLAG_RAM;
424
#ifndef CONFIG_BINFMT_ZFLAT
425
if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
426
fprintf(stderr, "Support for ZFLAT executables is not enabled\n");
432
* calculate the extra space we need to map in
434
extra = relocs * sizeof(abi_ulong);
435
if (extra < bss_len + stack_len)
436
extra = bss_len + stack_len;
438
/* Add space for library base pointers. Make sure this does not
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misalign the doesn't misalign the data segment. */
440
indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
441
indx_len = (indx_len + 15) & ~(abi_ulong)15;
444
* there are a couple of cases here, the separate code/data
445
* case, and then the fully copied to RAM case which lumps
448
if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
450
* this should give us a ROM ptr, but if it doesn't we don't
453
DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
455
textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
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MAP_PRIVATE, bprm->fd, 0);
458
fprintf(stderr, "Unable to mmap process text\n");
462
realdatastart = target_mmap(0, data_len + extra + indx_len,
463
PROT_READ|PROT_WRITE|PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (realdatastart == -1) {
467
fprintf(stderr, "Unable to allocate RAM for process data\n");
468
return realdatastart;
470
datapos = realdatastart + indx_len;
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DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
473
(int)(data_len + bss_len + stack_len), (int)datapos);
475
fpos = ntohl(hdr->data_start);
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#ifdef CONFIG_BINFMT_ZFLAT
477
if (flags & FLAT_FLAG_GZDATA) {
478
result = decompress_exec(bprm, fpos, (char *) datapos,
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data_len + (relocs * sizeof(abi_ulong)))
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result = target_pread(bprm->fd, datapos,
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data_len + (relocs * sizeof(abi_ulong)),
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fprintf(stderr, "Unable to read data+bss\n");
492
reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
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textpos = target_mmap(0, text_len + data_len + extra + indx_len,
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PROT_READ | PROT_EXEC | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (textpos == -1 ) {
500
fprintf(stderr, "Unable to allocate RAM for process text/data\n");
504
realdatastart = textpos + ntohl(hdr->data_start);
505
datapos = realdatastart + indx_len;
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reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
508
#ifdef CONFIG_BINFMT_ZFLAT
509
#error code needs checking
511
* load it all in and treat it like a RAM load from now on
513
if (flags & FLAT_FLAG_GZIP) {
514
result = decompress_exec(bprm, sizeof (struct flat_hdr),
515
(((char *) textpos) + sizeof (struct flat_hdr)),
516
(text_len + data_len + (relocs * sizeof(unsigned long))
517
- sizeof (struct flat_hdr)),
519
memmove((void *) datapos, (void *) realdatastart,
520
data_len + (relocs * sizeof(unsigned long)));
521
} else if (flags & FLAT_FLAG_GZDATA) {
523
result = bprm->file->f_op->read(bprm->file,
524
(char *) textpos, text_len, &fpos);
525
if (result < (unsigned long) -4096)
526
result = decompress_exec(bprm, text_len, (char *) datapos,
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data_len + (relocs * sizeof(unsigned long)), 0);
532
result = target_pread(bprm->fd, textpos,
535
result = target_pread(bprm->fd, datapos,
536
data_len + (relocs * sizeof(abi_ulong)),
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ntohl(hdr->data_start));
541
fprintf(stderr, "Unable to read code+data+bss\n");
546
DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
547
(int)textpos, 0x00ffffff&ntohl(hdr->entry),
548
ntohl(hdr->data_start));
550
/* The main program needs a little extra setup in the task structure */
551
start_code = textpos + sizeof (struct flat_hdr);
553
DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
554
id ? "Lib" : "Load", bprm->filename,
555
(int) start_code, (int) (textpos + text_len),
557
(int) (datapos + data_len),
558
(int) (datapos + data_len),
559
(int) (((datapos + data_len + bss_len) + 3) & ~3));
561
text_len -= sizeof(struct flat_hdr); /* the real code len */
563
/* Store the current module values into the global library structure */
564
libinfo[id].start_code = start_code;
565
libinfo[id].start_data = datapos;
566
libinfo[id].end_data = datapos + data_len;
567
libinfo[id].start_brk = datapos + data_len + bss_len;
568
libinfo[id].text_len = text_len;
569
libinfo[id].loaded = 1;
570
libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
571
libinfo[id].build_date = ntohl(hdr->build_date);
574
* We just load the allocations into some temporary memory to
575
* help simplify all this mumbo jumbo
577
* We've got two different sections of relocation entries.
578
* The first is the GOT which resides at the begining of the data segment
579
* and is terminated with a -1. This one can be relocated in place.
580
* The second is the extra relocation entries tacked after the image's
581
* data segment. These require a little more processing as the entry is
582
* really an offset into the image which contains an offset into the
585
if (flags & FLAT_FLAG_GOTPIC) {
589
if (get_user_ual(addr, rp))
594
addr = calc_reloc(addr, libinfo, id, 0);
595
if (addr == RELOC_FAILED)
597
if (put_user_ual(addr, rp))
600
rp += sizeof(abi_ulong);
605
* Now run through the relocation entries.
606
* We've got to be careful here as C++ produces relocatable zero
607
* entries in the constructor and destructor tables which are then
608
* tested for being not zero (which will always occur unless we're
609
* based from address zero). This causes an endless loop as __start
610
* is at zero. The solution used is to not relocate zero addresses.
611
* This has the negative side effect of not allowing a global data
612
* reference to be statically initialised to _stext (I've moved
613
* __start to address 4 so that is okay).
615
if (rev > OLD_FLAT_VERSION) {
616
abi_ulong persistent = 0;
617
for (i = 0; i < relocs; i++) {
618
abi_ulong addr, relval;
620
/* Get the address of the pointer to be
621
relocated (of course, the address has to be
623
if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
625
relval = ntohl(relval);
626
if (flat_set_persistent(relval, &persistent))
628
addr = flat_get_relocate_addr(relval);
629
rp = calc_reloc(addr, libinfo, id, 1);
630
if (rp == RELOC_FAILED)
633
/* Get the pointer's value. */
634
if (get_user_ual(addr, rp))
636
addr = flat_get_addr_from_rp(rp, relval, flags, &persistent);
639
* Do the relocation. PIC relocs in the data section are
640
* already in target order
642
if ((flags & FLAT_FLAG_GOTPIC) == 0)
644
addr = calc_reloc(addr, libinfo, id, 0);
645
if (addr == RELOC_FAILED)
648
/* Write back the relocated pointer. */
649
if (flat_put_addr_at_rp(rp, addr, relval))
654
for (i = 0; i < relocs; i++) {
656
if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
658
old_reloc(&libinfo[0], relval);
663
memset((void *)((unsigned long)datapos + data_len), 0, bss_len);
669
/****************************************************************************/
670
#ifdef CONFIG_BINFMT_SHARED_FLAT
673
* Load a shared library into memory. The library gets its own data
674
* segment (including bss) but not argv/argc/environ.
677
static int load_flat_shared_library(int id, struct lib_info *libs)
679
struct linux_binprm bprm;
683
/* Create the file name */
684
sprintf(buf, "/lib/lib%d.so", id);
686
/* Open the file up */
688
bprm.file = open_exec(bprm.filename);
689
res = PTR_ERR(bprm.file);
690
if (IS_ERR(bprm.file))
693
res = prepare_binprm(&bprm);
695
if (res <= (unsigned long)-4096)
696
res = load_flat_file(&bprm, libs, id, NULL);
698
allow_write_access(bprm.file);
705
#endif /* CONFIG_BINFMT_SHARED_FLAT */
707
int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
708
struct image_info * info)
710
struct lib_info libinfo[MAX_SHARED_LIBS];
711
abi_ulong p = bprm->p;
713
abi_ulong start_addr;
718
memset(libinfo, 0, sizeof(libinfo));
720
* We have to add the size of our arguments to our stack size
721
* otherwise it's too easy for users to create stack overflows
722
* by passing in a huge argument list. And yes, we have to be
723
* pedantic and include space for the argv/envp array as it may have
727
for (i = 0; i < bprm->argc; ++i) {
728
/* the argv strings */
729
stack_len += strlen(bprm->argv[i]);
731
for (i = 0; i < bprm->envc; ++i) {
732
/* the envp strings */
733
stack_len += strlen(bprm->envp[i]);
735
stack_len += (bprm->argc + 1) * 4; /* the argv array */
736
stack_len += (bprm->envc + 1) * 4; /* the envp array */
739
res = load_flat_file(bprm, libinfo, 0, &stack_len);
740
if (res > (unsigned long)-4096)
743
/* Update data segment pointers for all libraries */
744
for (i=0; i<MAX_SHARED_LIBS; i++) {
745
if (libinfo[i].loaded) {
747
p = libinfo[i].start_data;
748
for (j=0; j<MAX_SHARED_LIBS; j++) {
750
/* FIXME - handle put_user() failures */
751
if (put_user_ual(libinfo[j].loaded
752
? libinfo[j].start_data
760
p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
761
DBG_FLT("p=%x\n", (int)p);
763
/* Copy argv/envp. */
764
p = copy_strings(p, bprm->envc, bprm->envp);
765
p = copy_strings(p, bprm->argc, bprm->argv);
767
sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1);
768
/* Enforce final stack alignment of 16 bytes. This is sufficient
769
for all current targets, and excess alignment is harmless. */
770
stack_len = bprm->envc + bprm->argc + 2;
771
stack_len += 3; /* argc, arvg, argp */
772
stack_len *= sizeof(abi_ulong);
773
if ((sp + stack_len) & 15)
774
sp -= 16 - ((sp + stack_len) & 15);
775
sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p,
776
flat_argvp_envp_on_stack());
778
/* Fake some return addresses to ensure the call chain will
779
* initialise library in order for us. We are required to call
780
* lib 1 first, then 2, ... and finally the main program (id 0).
782
start_addr = libinfo[0].entry;
784
#ifdef CONFIG_BINFMT_SHARED_FLAT
786
for (i = MAX_SHARED_LIBS-1; i>0; i--) {
787
if (libinfo[i].loaded) {
788
/* Push previos first to call address */
790
if (put_user_ual(start_addr, sp))
792
start_addr = libinfo[i].entry;
797
/* Stash our initial stack pointer into the mm structure */
798
info->start_code = libinfo[0].start_code;
799
info->end_code = libinfo[0].start_code = libinfo[0].text_len;
800
info->start_data = libinfo[0].start_data;
801
info->end_data = libinfo[0].end_data;
802
info->start_brk = libinfo[0].start_brk;
803
info->start_stack = sp;
804
info->stack_limit = libinfo[0].start_brk;
805
info->entry = start_addr;
806
info->code_offset = info->start_code;
807
info->data_offset = info->start_data - libinfo[0].text_len;
809
DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
810
(int)info->entry, (int)info->start_stack);
added
removed
linux-user/flatload.c
