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556 lines
18 KiB
C
556 lines
18 KiB
C
/****************************************************************************/
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/*
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* QEMU bFLT binary loader. Based on linux/fs/binfmt_flat.c
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*
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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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*
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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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*
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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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*
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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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* based heavily on:
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*
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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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*/
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/****************************************************************************/
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#include "qemu/osdep.h"
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#include "qemu.h"
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#include "user-internals.h"
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#include "loader.h"
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#include "user-mmap.h"
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#include "flat.h"
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#include "target_flat.h"
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//#define DEBUG
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#ifdef DEBUG
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#define DBG_FLT(...) printf(__VA_ARGS__)
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#else
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#define DBG_FLT(...)
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#endif
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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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struct lib_info {
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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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};
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struct linux_binprm;
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/****************************************************************************/
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/*
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* 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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*/
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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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{
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int len;
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while (n-- > 0) {
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len = strlen(s[n]) + 1;
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p -= len;
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memcpy_to_target(p, s[n], len);
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}
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return p;
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}
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static int target_pread(int fd, abi_ulong ptr, abi_ulong len,
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abi_ulong offset)
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{
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void *buf;
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int ret;
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buf = lock_user(VERIFY_WRITE, ptr, len, 0);
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if (!buf) {
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return -EFAULT;
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}
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ret = pread(fd, buf, len, offset);
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if (ret < 0) {
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ret = -errno;
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}
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unlock_user(buf, ptr, len);
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return ret;
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}
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/****************************************************************************/
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static abi_ulong
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calc_reloc(abi_ulong r, struct lib_info *p, int curid, int internalp)
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{
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abi_ulong addr;
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int id;
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abi_ulong start_brk;
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abi_ulong start_data;
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abi_ulong text_len;
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abi_ulong start_code;
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id = 0;
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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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"(0 - 0x%x/0x%x)\n",
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(int) r,(int)(start_brk-start_code),(int)text_len);
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goto failed;
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}
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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...*/
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return(addr);
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failed:
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abort();
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return RELOC_FAILED;
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}
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/****************************************************************************/
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/* ??? This does not handle endianness correctly. */
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static void old_reloc(struct lib_info *libinfo, uint32_t rl)
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{
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#ifdef DEBUG
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const char *segment[] = { "TEXT", "DATA", "BSS", "*UNKNOWN*" };
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#endif
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uint32_t *ptr;
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uint32_t offset;
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int reloc_type;
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offset = rl & 0x3fffffff;
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reloc_type = rl >> 30;
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/* ??? How to handle this? */
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#if defined(CONFIG_COLDFIRE)
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ptr = (uint32_t *) ((unsigned long) libinfo->start_code + offset);
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#else
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ptr = (uint32_t *) ((unsigned long) libinfo->start_data + offset);
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#endif
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#ifdef DEBUG
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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]);
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#endif
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switch (reloc_type) {
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case OLD_FLAT_RELOC_TYPE_TEXT:
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*ptr += libinfo->start_code;
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break;
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case OLD_FLAT_RELOC_TYPE_DATA:
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*ptr += libinfo->start_data;
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break;
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case OLD_FLAT_RELOC_TYPE_BSS:
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*ptr += libinfo->end_data;
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break;
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default:
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fprintf(stderr, "BINFMT_FLAT: Unknown relocation type=%x\n",
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reloc_type);
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break;
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}
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DBG_FLT("Relocation became %x\n", (int)*ptr);
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}
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/****************************************************************************/
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static int load_flat_file(struct linux_binprm * bprm,
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struct lib_info *libinfo, int id, abi_ulong *extra_stack)
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{
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struct flat_hdr * hdr;
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abi_ulong textpos = 0, datapos = 0;
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abi_long result;
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abi_ulong realdatastart = 0;
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abi_ulong text_len, data_len, bss_len, stack_len, flags;
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abi_ulong extra;
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abi_ulong reloc = 0, rp;
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int i, rev, relocs = 0;
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abi_ulong fpos;
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abi_ulong start_code;
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abi_ulong indx_len;
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hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */
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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);
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stack_len = ntohl(hdr->stack_size);
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if (extra_stack) {
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stack_len += *extra_stack;
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*extra_stack = stack_len;
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}
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relocs = ntohl(hdr->reloc_count);
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flags = ntohl(hdr->flags);
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rev = ntohl(hdr->rev);
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DBG_FLT("BINFMT_FLAT: Loading file: %s\n", bprm->filename);
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if (rev != FLAT_VERSION && rev != OLD_FLAT_VERSION) {
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fprintf(stderr, "BINFMT_FLAT: bad magic/rev (0x%x, need 0x%x)\n",
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rev, (int) FLAT_VERSION);
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return -ENOEXEC;
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}
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/* Don't allow old format executables to use shared libraries */
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if (rev == OLD_FLAT_VERSION && id != 0) {
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fprintf(stderr, "BINFMT_FLAT: shared libraries are not available\n");
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return -ENOEXEC;
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}
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/*
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* fix up the flags for the older format, there were all kinds
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* of endian hacks, this only works for the simple cases
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*/
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if (rev == OLD_FLAT_VERSION && flat_old_ram_flag(flags))
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flags = FLAT_FLAG_RAM;
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if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) {
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fprintf(stderr, "ZFLAT executables are not supported\n");
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return -ENOEXEC;
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}
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/*
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* calculate the extra space we need to map in
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*/
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extra = relocs * sizeof(abi_ulong);
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if (extra < bss_len + stack_len)
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extra = bss_len + stack_len;
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/* Add space for library base pointers. Make sure this does not
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misalign the doesn't misalign the data segment. */
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indx_len = MAX_SHARED_LIBS * sizeof(abi_ulong);
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indx_len = (indx_len + 15) & ~(abi_ulong)15;
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/*
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* Allocate the address space.
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*/
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probe_guest_base(bprm->filename, 0,
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text_len + data_len + extra + indx_len - 1);
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/*
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* there are a couple of cases here, the separate code/data
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* case, and then the fully copied to RAM case which lumps
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* it all together.
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*/
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if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) {
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/*
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* this should give us a ROM ptr, but if it doesn't we don't
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* really care
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*/
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DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n");
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textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC,
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MAP_PRIVATE, bprm->src.fd, 0);
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if (textpos == -1) {
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fprintf(stderr, "Unable to mmap process text\n");
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return -1;
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}
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realdatastart = target_mmap(0, data_len + extra + indx_len,
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PROT_READ|PROT_WRITE|PROT_EXEC,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (realdatastart == -1) {
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fprintf(stderr, "Unable to allocate RAM for process data\n");
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return realdatastart;
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}
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datapos = realdatastart + indx_len;
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DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n",
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(int)(data_len + bss_len + stack_len), (int)datapos);
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fpos = ntohl(hdr->data_start);
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result = target_pread(bprm->src.fd, datapos,
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data_len + (relocs * sizeof(abi_ulong)),
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fpos);
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if (result < 0) {
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fprintf(stderr, "Unable to read data+bss\n");
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return result;
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}
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reloc = datapos + (ntohl(hdr->reloc_start) - text_len);
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} else {
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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 ) {
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fprintf(stderr, "Unable to allocate RAM for process text/data\n");
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return -1;
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}
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realdatastart = textpos + ntohl(hdr->data_start);
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datapos = realdatastart + indx_len;
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reloc = (textpos + ntohl(hdr->reloc_start) + indx_len);
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result = target_pread(bprm->src.fd, textpos,
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text_len, 0);
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if (result >= 0) {
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result = target_pread(bprm->src.fd, datapos,
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data_len + (relocs * sizeof(abi_ulong)),
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ntohl(hdr->data_start));
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}
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if (result < 0) {
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fprintf(stderr, "Unable to read code+data+bss\n");
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return result;
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}
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}
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DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n",
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(int)textpos, 0x00ffffff&ntohl(hdr->entry),
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ntohl(hdr->data_start));
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/* The main program needs a little extra setup in the task structure */
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start_code = textpos + sizeof (struct flat_hdr);
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DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n",
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id ? "Lib" : "Load", bprm->filename,
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(int) start_code, (int) (textpos + text_len),
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(int) datapos,
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(int) (datapos + data_len),
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(int) (datapos + data_len),
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(int) (((datapos + data_len + bss_len) + 3) & ~3));
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text_len -= sizeof(struct flat_hdr); /* the real code len */
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/* Store the current module values into the global library structure */
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libinfo[id].start_code = start_code;
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libinfo[id].start_data = datapos;
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libinfo[id].end_data = datapos + data_len;
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libinfo[id].start_brk = datapos + data_len + bss_len;
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libinfo[id].text_len = text_len;
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libinfo[id].loaded = 1;
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libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos;
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libinfo[id].build_date = ntohl(hdr->build_date);
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/*
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* We just load the allocations into some temporary memory to
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* help simplify all this mumbo jumbo
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*
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* We've got two different sections of relocation entries.
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* The first is the GOT which resides at the beginning of the data segment
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* and is terminated with a -1. This one can be relocated in place.
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* The second is the extra relocation entries tacked after the image's
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* data segment. These require a little more processing as the entry is
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* really an offset into the image which contains an offset into the
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* image.
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*/
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if (flags & FLAT_FLAG_GOTPIC) {
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rp = datapos;
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while (1) {
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abi_ulong addr;
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if (get_user_ual(addr, rp))
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return -EFAULT;
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if (addr == -1)
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break;
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if (addr) {
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addr = calc_reloc(addr, libinfo, id, 0);
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if (addr == RELOC_FAILED)
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return -ENOEXEC;
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if (put_user_ual(addr, rp))
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return -EFAULT;
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}
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rp += sizeof(abi_ulong);
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}
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}
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/*
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* Now run through the relocation entries.
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* We've got to be careful here as C++ produces relocatable zero
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* entries in the constructor and destructor tables which are then
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* tested for being not zero (which will always occur unless we're
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* based from address zero). This causes an endless loop as __start
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* is at zero. The solution used is to not relocate zero addresses.
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* This has the negative side effect of not allowing a global data
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* reference to be statically initialised to _stext (I've moved
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* __start to address 4 so that is okay).
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*/
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if (rev > OLD_FLAT_VERSION) {
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abi_ulong persistent = 0;
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for (i = 0; i < relocs; i++) {
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abi_ulong addr, relval;
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/* Get the address of the pointer to be
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relocated (of course, the address has to be
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relocated first). */
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if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
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return -EFAULT;
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relval = ntohl(relval);
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if (flat_set_persistent(relval, &persistent))
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continue;
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addr = flat_get_relocate_addr(relval);
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rp = calc_reloc(addr, libinfo, id, 1);
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if (rp == RELOC_FAILED)
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return -ENOEXEC;
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/* Get the pointer's value. */
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if (get_user_ual(addr, rp))
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return -EFAULT;
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addr = flat_get_addr_from_rp(addr, relval, flags, &persistent);
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if (addr != 0) {
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/*
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* Do the relocation. PIC relocs in the data section are
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* already in target order
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*/
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if ((flags & FLAT_FLAG_GOTPIC) == 0)
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addr = ntohl(addr);
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addr = calc_reloc(addr, libinfo, id, 0);
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if (addr == RELOC_FAILED)
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return -ENOEXEC;
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/* Write back the relocated pointer. */
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if (flat_put_addr_at_rp(rp, addr, relval))
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return -EFAULT;
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}
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}
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} else {
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for (i = 0; i < relocs; i++) {
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abi_ulong relval;
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if (get_user_ual(relval, reloc + i * sizeof(abi_ulong)))
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return -EFAULT;
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old_reloc(&libinfo[0], relval);
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}
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}
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/* zero the BSS. */
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memset(g2h_untagged(datapos + data_len), 0, bss_len);
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return 0;
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}
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/****************************************************************************/
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int load_flt_binary(struct linux_binprm *bprm, struct image_info *info)
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{
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struct lib_info libinfo[MAX_SHARED_LIBS];
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abi_ulong p;
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abi_ulong stack_len;
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abi_ulong start_addr;
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abi_ulong sp;
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int res;
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int i, j;
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memset(libinfo, 0, sizeof(libinfo));
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/*
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* We have to add the size of our arguments to our stack size
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* otherwise it's too easy for users to create stack overflows
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* by passing in a huge argument list. And yes, we have to be
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* pedantic and include space for the argv/envp array as it may have
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* a lot of entries.
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*/
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stack_len = 0;
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for (i = 0; i < bprm->argc; ++i) {
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/* the argv strings */
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stack_len += strlen(bprm->argv[i]);
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}
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for (i = 0; i < bprm->envc; ++i) {
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/* the envp strings */
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stack_len += strlen(bprm->envp[i]);
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}
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stack_len += (bprm->argc + 1) * 4; /* the argv array */
|
|
stack_len += (bprm->envc + 1) * 4; /* the envp array */
|
|
|
|
|
|
mmap_lock();
|
|
res = load_flat_file(bprm, libinfo, 0, &stack_len);
|
|
mmap_unlock();
|
|
|
|
if (is_error(res)) {
|
|
return res;
|
|
}
|
|
|
|
/* Update data segment pointers for all libraries */
|
|
for (i=0; i<MAX_SHARED_LIBS; i++) {
|
|
if (libinfo[i].loaded) {
|
|
abi_ulong seg;
|
|
seg = libinfo[i].start_data;
|
|
for (j=0; j<MAX_SHARED_LIBS; j++) {
|
|
seg -= 4;
|
|
/* FIXME - handle put_user() failures */
|
|
if (put_user_ual(libinfo[j].loaded
|
|
? libinfo[j].start_data
|
|
: UNLOADED_LIB,
|
|
seg))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
}
|
|
|
|
p = ((libinfo[0].start_brk + stack_len + 3) & ~3) - 4;
|
|
DBG_FLT("p=%x\n", (int)p);
|
|
|
|
/* Copy argv/envp. */
|
|
p = copy_strings(p, bprm->envc, bprm->envp);
|
|
p = copy_strings(p, bprm->argc, bprm->argv);
|
|
/* Align stack. */
|
|
sp = p & ~(abi_ulong)(sizeof(abi_ulong) - 1);
|
|
/* Enforce final stack alignment of 16 bytes. This is sufficient
|
|
for all current targets, and excess alignment is harmless. */
|
|
stack_len = bprm->envc + bprm->argc + 2;
|
|
stack_len += flat_argvp_envp_on_stack() ? 2 : 0; /* argv, argp */
|
|
stack_len += 1; /* argc */
|
|
stack_len *= sizeof(abi_ulong);
|
|
sp -= (sp - stack_len) & 15;
|
|
sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p,
|
|
flat_argvp_envp_on_stack());
|
|
|
|
/* Fake some return addresses to ensure the call chain will
|
|
* initialise library in order for us. We are required to call
|
|
* lib 1 first, then 2, ... and finally the main program (id 0).
|
|
*/
|
|
start_addr = libinfo[0].entry;
|
|
|
|
/* Stash our initial stack pointer into the mm structure */
|
|
info->start_code = libinfo[0].start_code;
|
|
info->end_code = libinfo[0].start_code + libinfo[0].text_len;
|
|
info->start_data = libinfo[0].start_data;
|
|
info->end_data = libinfo[0].end_data;
|
|
info->brk = libinfo[0].start_brk;
|
|
info->start_stack = sp;
|
|
info->stack_limit = libinfo[0].start_brk;
|
|
info->entry = start_addr;
|
|
info->code_offset = info->start_code;
|
|
info->data_offset = info->start_data - libinfo[0].text_len;
|
|
|
|
DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n",
|
|
(int)info->entry, (int)info->start_stack);
|
|
|
|
return 0;
|
|
}
|