Browse Source
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1951 c046a42c-6fe2-441c-8c8c-71466251a162stable-0.10
pbrook
20 years ago
8 changed files with 1147 additions and 272 deletions
@ -0,0 +1,67 @@ |
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/*
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* Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com> |
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> |
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* The Silver Hammer Group, Ltd. |
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* |
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* This file provides the definitions and structures needed to |
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* support uClinux flat-format executables. |
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*/ |
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#define FLAT_VERSION 0x00000004L |
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#ifdef CONFIG_BINFMT_SHARED_FLAT |
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#define MAX_SHARED_LIBS (4) |
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#else |
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#define MAX_SHARED_LIBS (1) |
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#endif |
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/*
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* To make everything easier to port and manage cross platform |
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* development, all fields are in network byte order. |
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*/ |
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struct flat_hdr { |
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char magic[4]; |
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unsigned long rev; /* version (as above) */ |
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unsigned long entry; /* Offset of first executable instruction
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with text segment from beginning of file */ |
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unsigned long data_start; /* Offset of data segment from beginning of
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file */ |
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unsigned long data_end; /* Offset of end of data segment
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from beginning of file */ |
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unsigned long bss_end; /* Offset of end of bss segment from beginning
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of file */ |
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/* (It is assumed that data_end through bss_end forms the bss segment.) */ |
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unsigned long stack_size; /* Size of stack, in bytes */ |
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unsigned long reloc_start; /* Offset of relocation records from
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beginning of file */ |
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unsigned long reloc_count; /* Number of relocation records */ |
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unsigned long flags; |
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unsigned long build_date; /* When the program/library was built */ |
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unsigned long filler[5]; /* Reservered, set to zero */ |
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}; |
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#define FLAT_FLAG_RAM 0x0001 /* load program entirely into RAM */ |
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#define FLAT_FLAG_GOTPIC 0x0002 /* program is PIC with GOT */ |
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#define FLAT_FLAG_GZIP 0x0004 /* all but the header is compressed */ |
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#define FLAT_FLAG_GZDATA 0x0008 /* only data/relocs are compressed (for XIP) */ |
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#define FLAT_FLAG_KTRACE 0x0010 /* output useful kernel trace for debugging */ |
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/*
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* While it would be nice to keep this header clean, users of older |
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* tools still need this support in the kernel. So this section is |
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* purely for compatibility with old tool chains. |
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* |
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* DO NOT make changes or enhancements to the old format please, just work |
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* with the format above, except to fix bugs with old format support. |
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*/ |
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#define OLD_FLAT_VERSION 0x00000002L |
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#define OLD_FLAT_RELOC_TYPE_TEXT 0 |
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#define OLD_FLAT_RELOC_TYPE_DATA 1 |
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#define OLD_FLAT_RELOC_TYPE_BSS 2 |
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# define OLD_FLAT_FLAG_RAM 0x1 /* load program entirely into RAM */ |
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@ -0,0 +1,790 @@ |
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/****************************************************************************/ |
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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, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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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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/* ??? ZFLAT and shared library support is currently disabled. */ |
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/****************************************************************************/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <errno.h> |
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#include <sys/mman.h> |
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#include <unistd.h> |
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#include "qemu.h" |
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#include "flat.h" |
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//#define DEBUG
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#ifdef DEBUG |
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#define DBG_FLT(a...) printf(a) |
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#else |
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#define DBG_FLT(a...) |
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#endif |
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#define flat_reloc_valid(reloc, size) ((reloc) <= (size)) |
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#define flat_old_ram_flag(flag) (flag) |
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#ifdef TARGET_WORDS_BIGENDIAN |
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#define flat_get_relocate_addr(relval) (relval) |
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#else |
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#define flat_get_relocate_addr(relval) bswap32(relval) |
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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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target_ulong start_code; /* Start of text segment */ |
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target_ulong start_data; /* Start of data segment */ |
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target_ulong end_data; /* Start of bss section */ |
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target_ulong start_brk; /* End of data segment */ |
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target_ulong text_len; /* Length of text segment */ |
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target_ulong entry; /* Start address for this module */ |
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target_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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#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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#endif |
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struct linux_binprm; |
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#define ntohl(x) be32_to_cpu(x) |
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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 target_ulong copy_strings(target_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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int target_pread(int fd, target_ulong ptr, target_ulong len, |
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target_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(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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return ret; |
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} |
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/****************************************************************************/ |
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#ifdef CONFIG_BINFMT_ZFLAT |
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#include <linux/zlib.h> |
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#define LBUFSIZE 4000 |
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/* gzip flag byte */ |
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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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char *dst, |
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long len, |
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int fd) |
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{ |
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unsigned char *buf; |
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z_stream strm; |
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loff_t fpos; |
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int ret, retval; |
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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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return -ENOMEM; |
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} |
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buf = kmalloc(LBUFSIZE, GFP_KERNEL); |
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if (buf == NULL) { |
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DBG_FLT("binfmt_flat: no memory for read buffer\n"); |
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retval = -ENOMEM; |
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goto out_free; |
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} |
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/* Read in first chunk of data and parse gzip header. */ |
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fpos = offset; |
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ret = bprm->file->f_op->read(bprm->file, buf, LBUFSIZE, &fpos); |
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strm.next_in = buf; |
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strm.avail_in = ret; |
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strm.total_in = 0; |
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retval = -ENOEXEC; |
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/* Check minimum size -- gzip header */ |
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if (ret < 10) { |
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DBG_FLT("binfmt_flat: file too small?\n"); |
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goto out_free_buf; |
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} |
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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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goto out_free_buf; |
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} |
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/* Check gzip method */ |
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if (buf[2] != 8) { |
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DBG_FLT("binfmt_flat: unknown compression method?\n"); |
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goto out_free_buf; |
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} |
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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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goto out_free_buf; |
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} |
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ret = 10; |
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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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goto out_free_buf; |
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} |
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} |
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if (buf[3] & ORIG_NAME) { |
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for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) |
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; |
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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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goto out_free_buf; |
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} |
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} |
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if (buf[3] & COMMENT) { |
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for (; ret < LBUFSIZE && (buf[ret] != 0); ret++) |
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; |
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if (unlikely(LBUFSIZE == ret)) { |
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DBG_FLT("binfmt_flat: buffer overflow (COMMENT)?\n"); |
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goto out_free_buf; |
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} |
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} |
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strm.next_in += ret; |
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strm.avail_in -= ret; |
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strm.next_out = dst; |
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strm.avail_out = len; |
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strm.total_out = 0; |
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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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goto out_free_buf; |
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} |
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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 <= 0) |
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break; |
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if (ret >= (unsigned long) -4096) |
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break; |
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len -= ret; |
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strm.next_in = buf; |
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strm.avail_in = ret; |
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strm.total_in = 0; |
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} |
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if (ret < 0) { |
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DBG_FLT("binfmt_flat: decompression failed (%d), %s\n", |
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ret, strm.msg); |
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goto out_zlib; |
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} |
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retval = 0; |
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out_zlib: |
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zlib_inflateEnd(&strm); |
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out_free_buf: |
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kfree(buf); |
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out_free: |
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kfree(strm.workspace); |
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out: |
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return retval; |
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} |
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#endif /* CONFIG_BINFMT_ZFLAT */ |
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/****************************************************************************/ |
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static target_ulong |
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calc_reloc(target_ulong r, struct lib_info *p, int curid, int internalp) |
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{ |
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target_ulong addr; |
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int id; |
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target_ulong start_brk; |
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target_ulong start_data; |
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target_ulong text_len; |
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target_ulong start_code; |
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#ifdef CONFIG_BINFMT_SHARED_FLAT |
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#error needs checking |
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if (r == 0) |
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id = curid; /* Relocs of 0 are always self referring */ |
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else { |
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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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} |
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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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(unsigned) r, id); |
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goto failed; |
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} |
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if (curid != id) { |
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if (internalp) { |
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fprintf(stderr, "BINFMT_FLAT: reloc address 0x%x not " |
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"in same module (%d != %d)\n", |
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(unsigned) r, curid, id); |
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goto failed; |
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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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goto failed; |
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} |
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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) { |
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fprintf(stderr, "BINFMT_FLAT: library %d is younger than %d\n", |
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id, curid); |
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goto failed; |
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} |
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} |
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#else |
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id = 0; |
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#endif |
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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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void old_reloc(struct lib_info *libinfo, uint32_t rl) |
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{ |
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#ifdef DEBUG |
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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 *) (libinfo->start_code + offset); |
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#else |
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ptr = (uint32_t *) (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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/****************************************************************************/ |
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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, target_ulong *extra_stack) |
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{ |
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struct flat_hdr * hdr; |
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target_ulong textpos = 0, datapos = 0, result; |
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target_ulong realdatastart = 0; |
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target_ulong text_len, data_len, bss_len, stack_len, flags; |
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target_ulong memp = 0; /* for finding the brk area */ |
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target_ulong extra; |
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target_ulong reloc = 0, rp; |
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int i, rev, relocs = 0; |
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target_ulong fpos; |
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target_ulong start_code, end_code; |
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|
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hdr = ((struct flat_hdr *) bprm->buf); /* exec-header */ |
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|
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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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|
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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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|
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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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/*
|
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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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|
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#ifndef CONFIG_BINFMT_ZFLAT |
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if (flags & (FLAT_FLAG_GZIP|FLAT_FLAG_GZDATA)) { |
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fprintf(stderr, "Support for ZFLAT executables is not enabled\n"); |
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return -ENOEXEC; |
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} |
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#endif |
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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(target_ulong); |
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if (extra < bss_len + stack_len) |
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extra = bss_len + stack_len; |
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|
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/*
|
|||
* there are a couple of cases here, the separate code/data |
|||
* case, and then the fully copied to RAM case which lumps |
|||
* it all together. |
|||
*/ |
|||
if ((flags & (FLAT_FLAG_RAM|FLAT_FLAG_GZIP)) == 0) { |
|||
/*
|
|||
* this should give us a ROM ptr, but if it doesn't we don't |
|||
* really care |
|||
*/ |
|||
DBG_FLT("BINFMT_FLAT: ROM mapping of file (we hope)\n"); |
|||
|
|||
textpos = target_mmap(0, text_len, PROT_READ|PROT_EXEC, |
|||
MAP_PRIVATE, bprm->fd, 0); |
|||
if (textpos == -1) { |
|||
fprintf(stderr, "Unable to mmap process text\n"); |
|||
return -1; |
|||
} |
|||
|
|||
realdatastart = target_mmap(0, data_len + extra + |
|||
MAX_SHARED_LIBS * sizeof(target_ulong), |
|||
PROT_READ|PROT_WRITE|PROT_EXEC, |
|||
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
|||
|
|||
if (realdatastart == -1) { |
|||
fprintf(stderr, "Unable to allocate RAM for process data\n"); |
|||
return realdatastart; |
|||
} |
|||
datapos = realdatastart + MAX_SHARED_LIBS * sizeof(target_ulong); |
|||
|
|||
DBG_FLT("BINFMT_FLAT: Allocated data+bss+stack (%d bytes): %x\n", |
|||
(int)(data_len + bss_len + stack_len), (int)datapos); |
|||
|
|||
fpos = ntohl(hdr->data_start); |
|||
#ifdef CONFIG_BINFMT_ZFLAT |
|||
if (flags & FLAT_FLAG_GZDATA) { |
|||
result = decompress_exec(bprm, fpos, (char *) datapos, |
|||
data_len + (relocs * sizeof(target_ulong))) |
|||
} else |
|||
#endif |
|||
{ |
|||
result = target_pread(bprm->fd, datapos, |
|||
data_len + (relocs * sizeof(target_ulong)), |
|||
fpos); |
|||
} |
|||
if (result < 0) { |
|||
fprintf(stderr, "Unable to read data+bss\n"); |
|||
return result; |
|||
} |
|||
|
|||
reloc = datapos + (ntohl(hdr->reloc_start) - text_len); |
|||
memp = realdatastart; |
|||
|
|||
} else { |
|||
|
|||
textpos = target_mmap(0, text_len + data_len + extra + |
|||
MAX_SHARED_LIBS * sizeof(target_ulong), |
|||
PROT_READ | PROT_EXEC | PROT_WRITE, |
|||
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
|||
if (textpos == -1 ) { |
|||
fprintf(stderr, "Unable to allocate RAM for process text/data\n"); |
|||
return -1; |
|||
} |
|||
|
|||
realdatastart = textpos + ntohl(hdr->data_start); |
|||
datapos = realdatastart + MAX_SHARED_LIBS * sizeof(target_ulong); |
|||
reloc = (textpos + ntohl(hdr->reloc_start) + |
|||
MAX_SHARED_LIBS * sizeof(target_ulong)); |
|||
memp = textpos; |
|||
|
|||
#ifdef CONFIG_BINFMT_ZFLAT |
|||
#error code needs checking |
|||
/*
|
|||
* load it all in and treat it like a RAM load from now on |
|||
*/ |
|||
if (flags & FLAT_FLAG_GZIP) { |
|||
result = decompress_exec(bprm, sizeof (struct flat_hdr), |
|||
(((char *) textpos) + sizeof (struct flat_hdr)), |
|||
(text_len + data_len + (relocs * sizeof(unsigned long)) |
|||
- sizeof (struct flat_hdr)), |
|||
0); |
|||
memmove((void *) datapos, (void *) realdatastart, |
|||
data_len + (relocs * sizeof(unsigned long))); |
|||
} else if (flags & FLAT_FLAG_GZDATA) { |
|||
fpos = 0; |
|||
result = bprm->file->f_op->read(bprm->file, |
|||
(char *) textpos, text_len, &fpos); |
|||
if (result < (unsigned long) -4096) |
|||
result = decompress_exec(bprm, text_len, (char *) datapos, |
|||
data_len + (relocs * sizeof(unsigned long)), 0); |
|||
} |
|||
else |
|||
#endif |
|||
{ |
|||
result = target_pread(bprm->fd, textpos, |
|||
text_len, 0); |
|||
if (result >= 0) { |
|||
result = target_pread(bprm->fd, datapos, |
|||
data_len + (relocs * sizeof(target_ulong)), |
|||
ntohl(hdr->data_start)); |
|||
} |
|||
} |
|||
if (result < 0) { |
|||
fprintf(stderr, "Unable to read code+data+bss\n"); |
|||
return result; |
|||
} |
|||
} |
|||
|
|||
DBG_FLT("Mapping is 0x%x, Entry point is 0x%x, data_start is 0x%x\n", |
|||
(int)textpos, 0x00ffffff&ntohl(hdr->entry), |
|||
ntohl(hdr->data_start)); |
|||
|
|||
/* The main program needs a little extra setup in the task structure */ |
|||
start_code = textpos + sizeof (struct flat_hdr); |
|||
end_code = textpos + text_len; |
|||
|
|||
DBG_FLT("%s %s: TEXT=%x-%x DATA=%x-%x BSS=%x-%x\n", |
|||
id ? "Lib" : "Load", bprm->filename, |
|||
(int) start_code, (int) end_code, |
|||
(int) datapos, |
|||
(int) (datapos + data_len), |
|||
(int) (datapos + data_len), |
|||
(int) (((datapos + data_len + bss_len) + 3) & ~3)); |
|||
|
|||
text_len -= sizeof(struct flat_hdr); /* the real code len */ |
|||
|
|||
/* Store the current module values into the global library structure */ |
|||
libinfo[id].start_code = start_code; |
|||
libinfo[id].start_data = datapos; |
|||
libinfo[id].end_data = datapos + data_len; |
|||
libinfo[id].start_brk = datapos + data_len + bss_len; |
|||
libinfo[id].text_len = text_len; |
|||
libinfo[id].loaded = 1; |
|||
libinfo[id].entry = (0x00ffffff & ntohl(hdr->entry)) + textpos; |
|||
libinfo[id].build_date = ntohl(hdr->build_date); |
|||
|
|||
/*
|
|||
* We just load the allocations into some temporary memory to |
|||
* help simplify all this mumbo jumbo |
|||
* |
|||
* We've got two different sections of relocation entries. |
|||
* The first is the GOT which resides at the begining of the data segment |
|||
* and is terminated with a -1. This one can be relocated in place. |
|||
* The second is the extra relocation entries tacked after the image's |
|||
* data segment. These require a little more processing as the entry is |
|||
* really an offset into the image which contains an offset into the |
|||
* image. |
|||
*/ |
|||
if (flags & FLAT_FLAG_GOTPIC) { |
|||
rp = datapos; |
|||
while (1) { |
|||
target_ulong addr; |
|||
addr = tgetl(rp); |
|||
if (addr == -1) |
|||
break; |
|||
if (addr) { |
|||
addr = calc_reloc(addr, libinfo, id, 0); |
|||
if (addr == RELOC_FAILED) |
|||
return -ENOEXEC; |
|||
tputl(rp, addr); |
|||
} |
|||
rp += sizeof(target_ulong); |
|||
} |
|||
} |
|||
|
|||
/*
|
|||
* Now run through the relocation entries. |
|||
* We've got to be careful here as C++ produces relocatable zero |
|||
* entries in the constructor and destructor tables which are then |
|||
* tested for being not zero (which will always occur unless we're |
|||
* based from address zero). This causes an endless loop as __start |
|||
* is at zero. The solution used is to not relocate zero addresses. |
|||
* This has the negative side effect of not allowing a global data |
|||
* reference to be statically initialised to _stext (I've moved |
|||
* __start to address 4 so that is okay). |
|||
*/ |
|||
if (rev > OLD_FLAT_VERSION) { |
|||
for (i = 0; i < relocs; i++) { |
|||
target_ulong addr, relval; |
|||
|
|||
/* Get the address of the pointer to be
|
|||
relocated (of course, the address has to be |
|||
relocated first). */ |
|||
relval = tgetl(reloc + i * sizeof (target_ulong)); |
|||
addr = flat_get_relocate_addr(relval); |
|||
rp = calc_reloc(addr, libinfo, id, 1); |
|||
if (rp == RELOC_FAILED) |
|||
return -ENOEXEC; |
|||
|
|||
/* Get the pointer's value. */ |
|||
addr = tgetl(rp); |
|||
if (addr != 0) { |
|||
/*
|
|||
* Do the relocation. PIC relocs in the data section are |
|||
* already in target order |
|||
*/ |
|||
|
|||
#ifndef TARGET_WORDS_BIGENDIAN |
|||
if ((flags & FLAT_FLAG_GOTPIC) == 0) |
|||
addr = bswap32(addr); |
|||
#endif |
|||
addr = calc_reloc(addr, libinfo, id, 0); |
|||
if (addr == RELOC_FAILED) |
|||
return -ENOEXEC; |
|||
|
|||
/* Write back the relocated pointer. */ |
|||
tputl(rp, addr); |
|||
} |
|||
} |
|||
} else { |
|||
for (i = 0; i < relocs; i++) { |
|||
target_ulong relval; |
|||
relval = tgetl(reloc + i * sizeof (target_ulong)); |
|||
old_reloc(&libinfo[0], relval); |
|||
} |
|||
} |
|||
|
|||
/* zero the BSS. */ |
|||
memset((void*)(datapos + data_len), 0, bss_len); |
|||
|
|||
return 0; |
|||
} |
|||
|
|||
|
|||
/****************************************************************************/ |
|||
#ifdef CONFIG_BINFMT_SHARED_FLAT |
|||
|
|||
/*
|
|||
* Load a shared library into memory. The library gets its own data |
|||
* segment (including bss) but not argv/argc/environ. |
|||
*/ |
|||
|
|||
static int load_flat_shared_library(int id, struct lib_info *libs) |
|||
{ |
|||
struct linux_binprm bprm; |
|||
int res; |
|||
char buf[16]; |
|||
|
|||
/* Create the file name */ |
|||
sprintf(buf, "/lib/lib%d.so", id); |
|||
|
|||
/* Open the file up */ |
|||
bprm.filename = buf; |
|||
bprm.file = open_exec(bprm.filename); |
|||
res = PTR_ERR(bprm.file); |
|||
if (IS_ERR(bprm.file)) |
|||
return res; |
|||
|
|||
res = prepare_binprm(&bprm); |
|||
|
|||
if (res <= (unsigned long)-4096) |
|||
res = load_flat_file(&bprm, libs, id, NULL); |
|||
if (bprm.file) { |
|||
allow_write_access(bprm.file); |
|||
fput(bprm.file); |
|||
bprm.file = NULL; |
|||
} |
|||
return(res); |
|||
} |
|||
|
|||
#endif /* CONFIG_BINFMT_SHARED_FLAT */ |
|||
|
|||
int load_flt_binary(struct linux_binprm * bprm, struct target_pt_regs * regs, |
|||
struct image_info * info) |
|||
{ |
|||
struct lib_info libinfo[MAX_SHARED_LIBS]; |
|||
target_ulong p = bprm->p; |
|||
target_ulong stack_len; |
|||
target_ulong start_addr; |
|||
target_ulong sp; |
|||
int res; |
|||
int i, j; |
|||
|
|||
memset(libinfo, 0, sizeof(libinfo)); |
|||
/*
|
|||
* We have to add the size of our arguments to our stack size |
|||
* otherwise it's too easy for users to create stack overflows |
|||
* by passing in a huge argument list. And yes, we have to be |
|||
* pedantic and include space for the argv/envp array as it may have |
|||
* a lot of entries. |
|||
*/ |
|||
#define TOP_OF_ARGS (TARGET_PAGE_SIZE * MAX_ARG_PAGES - sizeof(void *)) |
|||
stack_len = TOP_OF_ARGS - bprm->p; /* the strings */ |
|||
stack_len += (bprm->argc + 1) * 4; /* the argv array */ |
|||
stack_len += (bprm->envc + 1) * 4; /* the envp array */ |
|||
|
|||
|
|||
res = load_flat_file(bprm, libinfo, 0, &stack_len); |
|||
if (res > (unsigned long)-4096) |
|||
return res; |
|||
|
|||
/* Update data segment pointers for all libraries */ |
|||
for (i=0; i<MAX_SHARED_LIBS; i++) { |
|||
if (libinfo[i].loaded) { |
|||
target_ulong p; |
|||
p = libinfo[i].start_data; |
|||
for (j=0; j<MAX_SHARED_LIBS; j++) { |
|||
p -= 4; |
|||
tput32(p, libinfo[j].loaded |
|||
? libinfo[j].start_data |
|||
: UNLOADED_LIB); |
|||
} |
|||
} |
|||
} |
|||
|
|||
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->argc, bprm->argv); |
|||
p = copy_strings(p, bprm->envc, bprm->envp); |
|||
/* Align stack. */ |
|||
sp = p & ~(target_ulong)(sizeof(target_ulong) - 1); |
|||
sp = loader_build_argptr(bprm->envc, bprm->argc, sp, p, 1); |
|||
|
|||
/* 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; |
|||
|
|||
#ifdef CONFIG_BINFMT_SHARED_FLAT |
|||
#error here |
|||
for (i = MAX_SHARED_LIBS-1; i>0; i--) { |
|||
if (libinfo[i].loaded) { |
|||
/* Push previos first to call address */ |
|||
--sp; put_user(start_addr, sp); |
|||
start_addr = libinfo[i].entry; |
|||
} |
|||
} |
|||
#endif |
|||
|
|||
/* 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->start_brk = libinfo[0].start_brk; |
|||
info->start_stack = sp; |
|||
info->entry = start_addr; |
|||
DBG_FLT("start_thread(entry=0x%x, start_stack=0x%x)\n", |
|||
(int)info->entry, (int)info->start_stack); |
|||
|
|||
return 0; |
|||
} |
|||
@ -0,0 +1,195 @@ |
|||
/* Code for loading Linux executables. Mostly linux kenrel code. */ |
|||
|
|||
#include <sys/types.h> |
|||
#include <sys/stat.h> |
|||
#include <fcntl.h> |
|||
#include <errno.h> |
|||
#include <unistd.h> |
|||
#include <stdio.h> |
|||
#include <stdlib.h> |
|||
|
|||
#include "qemu.h" |
|||
|
|||
#define NGROUPS 32 |
|||
|
|||
/* ??? This should really be somewhere else. */ |
|||
void memcpy_to_target(target_ulong dest, const void *src, |
|||
unsigned long len) |
|||
{ |
|||
void *host_ptr; |
|||
|
|||
host_ptr = lock_user(dest, len, 0); |
|||
memcpy(host_ptr, src, len); |
|||
unlock_user(host_ptr, dest, 1); |
|||
} |
|||
|
|||
static int in_group_p(gid_t g) |
|||
{ |
|||
/* return TRUE if we're in the specified group, FALSE otherwise */ |
|||
int ngroup; |
|||
int i; |
|||
gid_t grouplist[NGROUPS]; |
|||
|
|||
ngroup = getgroups(NGROUPS, grouplist); |
|||
for(i = 0; i < ngroup; i++) { |
|||
if(grouplist[i] == g) { |
|||
return 1; |
|||
} |
|||
} |
|||
return 0; |
|||
} |
|||
|
|||
static int count(char ** vec) |
|||
{ |
|||
int i; |
|||
|
|||
for(i = 0; *vec; i++) { |
|||
vec++; |
|||
} |
|||
|
|||
return(i); |
|||
} |
|||
|
|||
static int prepare_binprm(struct linux_binprm *bprm) |
|||
{ |
|||
struct stat st; |
|||
int mode; |
|||
int retval, id_change; |
|||
|
|||
if(fstat(bprm->fd, &st) < 0) { |
|||
return(-errno); |
|||
} |
|||
|
|||
mode = st.st_mode; |
|||
if(!S_ISREG(mode)) { /* Must be regular file */ |
|||
return(-EACCES); |
|||
} |
|||
if(!(mode & 0111)) { /* Must have at least one execute bit set */ |
|||
return(-EACCES); |
|||
} |
|||
|
|||
bprm->e_uid = geteuid(); |
|||
bprm->e_gid = getegid(); |
|||
id_change = 0; |
|||
|
|||
/* Set-uid? */ |
|||
if(mode & S_ISUID) { |
|||
bprm->e_uid = st.st_uid; |
|||
if(bprm->e_uid != geteuid()) { |
|||
id_change = 1; |
|||
} |
|||
} |
|||
|
|||
/* Set-gid? */ |
|||
/*
|
|||
* If setgid is set but no group execute bit then this |
|||
* is a candidate for mandatory locking, not a setgid |
|||
* executable. |
|||
*/ |
|||
if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { |
|||
bprm->e_gid = st.st_gid; |
|||
if (!in_group_p(bprm->e_gid)) { |
|||
id_change = 1; |
|||
} |
|||
} |
|||
|
|||
memset(bprm->buf, 0, sizeof(bprm->buf)); |
|||
retval = lseek(bprm->fd, 0L, SEEK_SET); |
|||
if(retval >= 0) { |
|||
retval = read(bprm->fd, bprm->buf, 128); |
|||
} |
|||
if(retval < 0) { |
|||
perror("prepare_binprm"); |
|||
exit(-1); |
|||
/* return(-errno); */ |
|||
} |
|||
else { |
|||
return(retval); |
|||
} |
|||
} |
|||
|
|||
/* Construct the envp and argv tables on the target stack. */ |
|||
target_ulong loader_build_argptr(int envc, int argc, target_ulong sp, |
|||
target_ulong stringp, int push_ptr) |
|||
{ |
|||
int n = sizeof(target_ulong); |
|||
target_ulong envp; |
|||
target_ulong argv; |
|||
|
|||
sp -= (envc + 1) * n; |
|||
envp = sp; |
|||
sp -= (argc + 1) * n; |
|||
argv = sp; |
|||
if (push_ptr) { |
|||
sp -= n; tputl(sp, envp); |
|||
sp -= n; tputl(sp, argv); |
|||
} |
|||
sp -= n; tputl(sp, argc); |
|||
|
|||
while (argc-- > 0) { |
|||
tputl(argv, stringp); argv += n; |
|||
stringp += target_strlen(stringp) + 1; |
|||
} |
|||
tputl(argv, 0); |
|||
while (envc-- > 0) { |
|||
tputl(envp, stringp); envp += n; |
|||
stringp += target_strlen(stringp) + 1; |
|||
} |
|||
tputl(envp, 0); |
|||
|
|||
return sp; |
|||
} |
|||
|
|||
int loader_exec(const char * filename, char ** argv, char ** envp, |
|||
struct target_pt_regs * regs, struct image_info *infop) |
|||
{ |
|||
struct linux_binprm bprm; |
|||
int retval; |
|||
int i; |
|||
|
|||
bprm.p = TARGET_PAGE_SIZE*MAX_ARG_PAGES-sizeof(unsigned int); |
|||
for (i=0 ; i<MAX_ARG_PAGES ; i++) /* clear page-table */ |
|||
bprm.page[i] = 0; |
|||
retval = open(filename, O_RDONLY); |
|||
if (retval < 0) |
|||
return retval; |
|||
bprm.fd = retval; |
|||
bprm.filename = (char *)filename; |
|||
bprm.argc = count(argv); |
|||
bprm.argv = argv; |
|||
bprm.envc = count(envp); |
|||
bprm.envp = envp; |
|||
|
|||
retval = prepare_binprm(&bprm); |
|||
|
|||
if(retval>=0) { |
|||
if (bprm.buf[0] == 0x7f |
|||
&& bprm.buf[1] == 'E' |
|||
&& bprm.buf[2] == 'L' |
|||
&& bprm.buf[3] == 'F') { |
|||
retval = load_elf_binary(&bprm,regs,infop); |
|||
#if defined(TARGET_HAS_BFLT) |
|||
} else if (bprm.buf[0] == 'b' |
|||
&& bprm.buf[1] == 'F' |
|||
&& bprm.buf[2] == 'L' |
|||
&& bprm.buf[3] == 'T') { |
|||
retval = load_flt_binary(&bprm,regs,infop); |
|||
#endif |
|||
} else { |
|||
fprintf(stderr, "Unknown binary format\n"); |
|||
return -1; |
|||
} |
|||
} |
|||
|
|||
if(retval>=0) { |
|||
/* success. Initialize important registers */ |
|||
do_init_thread(regs, infop); |
|||
return retval; |
|||
} |
|||
|
|||
/* Something went wrong, return the inode and free the argument pages*/ |
|||
for (i=0 ; i<MAX_ARG_PAGES ; i++) { |
|||
free(bprm.page[i]); |
|||
} |
|||
return(retval); |
|||
} |
|||
Loading…
Reference in new issue