$NetBSD: patch-ab,v 1.4 2017/04/29 01:11:55 tsutsui Exp $ Pull unexelf.c from newer emacs. --- src/unexelf.c.orig 1994-10-21 04:21:00.000000000 +0000 +++ src/unexelf.c @@ -1,19 +1,22 @@ -/* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992 +/* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000, 01, 02 Free Software Foundation, Inc. - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2, or (at your option) - any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, write to the Free Software - Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +This file is part of GNU Emacs. + +GNU Emacs is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Emacs is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Emacs; see the file COPYING. If not, write to +the Free Software Foundation, Inc., 59 Temple Place - Suite 330, +Boston, MA 02111-1307, USA. In other words, you are welcome to use, share and improve this program. You are forbidden to forbid anyone else to use, share and improve @@ -30,14 +33,14 @@ what you give them. Help stamp out sof * Modified heavily since then. * * Synopsis: - * unexec (new_name, a_name, data_start, bss_start, entry_address) - * char *new_name, *a_name; + * unexec (new_name, old_name, data_start, bss_start, entry_address) + * char *new_name, *old_name; * unsigned data_start, bss_start, entry_address; * * Takes a snapshot of the program and makes an a.out format file in the * file named by the string argument new_name. - * If a_name is non-NULL, the symbol table will be taken from the given file. - * On some machines, an existing a_name file is required. + * If old_name is non-NULL, the symbol table will be taken from the given file. + * On some machines, an existing old_name file is required. * * The boundaries within the a.out file may be adjusted with the data_start * and bss_start arguments. Either or both may be given as 0 for defaults. @@ -49,11 +52,6 @@ what you give them. Help stamp out sof * The value you specify may be rounded down to a suitable boundary * as required by the machine you are using. * - * Specifying zero for data_start means the boundary between text and data - * should not be the same as when the program was loaded. - * If NO_REMAP is defined, the argument data_start is ignored and the - * segment boundaries are never changed. - * * Bss_start indicates how much of the data segment is to be saved in the * a.out file and restored when the program is executed. It gives the lowest * unsaved address, and is rounded up to a page boundary. The default when 0 @@ -63,9 +61,6 @@ what you give them. Help stamp out sof * * The new file is set up to start at entry_address. * - * If you make improvements I'd like to get them too. - * harpo!utah-cs!thomas, thomas@Utah-20 - * */ /* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co. @@ -315,25 +310,25 @@ Filesz Memsz Flags Alig */ - -/* Modified by wtien@urbana.mcd.mot.com of Motorola Inc. - * + +/* Modified by wtien@urbana.mcd.mot.com of Motorola Inc. + * * The above mechanism does not work if the unexeced ELF file is being - * re-layout by other applications (such as `strip'). All the applications + * re-layout by other applications (such as `strip'). All the applications * that re-layout the internal of ELF will layout all sections in ascending - * order of their file offsets. After the re-layout, the data2 section will - * still be the LAST section in the section header vector, but its file offset + * order of their file offsets. After the re-layout, the data2 section will + * still be the LAST section in the section header vector, but its file offset * is now being pushed far away down, and causes part of it not to be mapped - * in (ie. not covered by the load segment entry in PHDR vector), therefore + * in (ie. not covered by the load segment entry in PHDR vector), therefore * causes the new binary to fail. * * The solution is to modify the unexec algorithm to insert the new data2 * section header right before the new bss section header, so their file - * offsets will be in the ascending order. Since some of the section's (all - * sections AFTER the bss section) indexes are now changed, we also need to - * modify some fields to make them point to the right sections. This is done + * offsets will be in the ascending order. Since some of the section's (all + * sections AFTER the bss section) indexes are now changed, we also need to + * modify some fields to make them point to the right sections. This is done * by macro PATCH_INDEX. All the fields that need to be patched are: - * + * * 1. ELF header e_shstrndx field. * 2. section header sh_link and sh_info field. * 3. symbol table entry st_shndx field. @@ -345,85 +340,214 @@ Filesz Memsz Flags Alig Link Info Adralgn Entsize [1] 1 2 0x80480d4 0xd4 0x13 .interp - 0 0 0x1 0 + 0 0 0x1 0 [2] 5 2 0x80480e8 0xe8 0x388 .hash - 3 0 0x4 0x4 + 3 0 0x4 0x4 [3] 11 2 0x8048470 0x470 0x7f0 .dynsym - 4 1 0x4 0x10 + 4 1 0x4 0x10 [4] 3 2 0x8048c60 0xc60 0x3ad .dynstr - 0 0 0x1 0 + 0 0 0x1 0 [5] 9 2 0x8049010 0x1010 0x338 .rel.plt - 3 7 0x4 0x8 + 3 7 0x4 0x8 [6] 1 6 0x8049348 0x1348 0x3 .init - 0 0 0x4 0 + 0 0 0x4 0 [7] 1 6 0x804934c 0x134c 0x680 .plt - 0 0 0x4 0x4 + 0 0 0x4 0x4 [8] 1 6 0x80499cc 0x19cc 0x3c56f .text - 0 0 0x4 0 + 0 0 0x4 0 [9] 1 6 0x8085f3c 0x3df3c 0x3 .fini - 0 0 0x4 0 + 0 0 0x4 0 [10] 1 2 0x8085f40 0x3df40 0x69c .rodata - 0 0 0x4 0 + 0 0 0x4 0 [11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 - 0 0 0x4 0 + 0 0 0x4 0 [12] 1 3 0x8088330 0x3f330 0x20afc .data - 0 0 0x4 0 + 0 0 0x4 0 [13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 - 0 0 0x4 0 + 0 0 0x4 0 [14] 1 3 0x80a96cc 0x606cc 0x1a8 .got - 0 0 0x4 0x4 + 0 0 0x4 0x4 [15] 6 3 0x80a9874 0x60874 0x80 .dynamic - 4 0 0x4 0x8 + 4 0 0x4 0x8 [16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data - 0 0 0x4 0 + 0 0 0x4 0 [17] 8 3 0x80c6800 0x7d800 0 .bss - 0 0 0x4 0 + 0 0 0x4 0 [18] 2 0 0 0x7d800 0x9b90 .symtab - 19 371 0x4 0x10 + 19 371 0x4 0x10 [19] 3 0 0 0x87390 0x8526 .strtab - 0 0 0x1 0 + 0 0 0x1 0 [20] 3 0 0 0x8f8b6 0x93 .shstrtab - 0 0 0x1 0 + 0 0 0x1 0 [21] 1 0 0 0x8f949 0x68b7 .comment - 0 0 0x1 0 + 0 0 0x1 0 */ +/* + * Modified by rdh@yottayotta.com of Yotta Yotta Incorporated. + * + * The code originally used mmap() to create a memory image of the new + * and old object files. This had a few handy features: (1) you get + * to use a cool system call like mmap, (2) no need to explicitly + * write out the new file before the close, and (3) no swap space + * requirements. Unfortunately, mmap() often fails to work with + * nfs-mounted file systems. + * + * So, instead of relying on the vm subsystem to do the file i/o for + * us, it's now done explicitly. A buffer of the right size for the + * file is dynamically allocated, and either the old_name is read into + * it, or it is initialized with the correct new executable contents, + * and then written to new_name. + */ + +#ifndef emacs +#define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1) +#include +#else +#include "config.h" +#endif + #include #include #include #include -#include #include #include #include +#if !defined (__NetBSD__) && !defined (__OpenBSD__) #include +#endif #include - -#ifndef emacs -#define fatal(a, b, c) fprintf (stderr, a, b, c), exit (1) +#if defined (__sony_news) && defined (_SYSTYPE_SYSV) +#include +#include +#endif /* __sony_news && _SYSTYPE_SYSV */ +#if __sgi +#include /* for HDRR declaration */ +#endif /* __sgi */ + +#ifndef MAP_ANON +#ifdef MAP_ANONYMOUS +#define MAP_ANON MAP_ANONYMOUS #else -extern void fatal (char *, ...); +#define MAP_ANON 0 +#endif +#endif + +#ifdef MCPATH /* hir, 1993.8.4 */ +#undef open +#undef chmod +#endif + +#ifndef MAP_FAILED +#define MAP_FAILED ((void *) -1) +#endif + +#if defined (__alpha__) && !defined (__NetBSD__) && !defined (__OpenBSD__) +/* Declare COFF debugging symbol table. This used to be in + /usr/include/sym.h, but this file is no longer included in Red Hat + 5.0 and presumably in any other glibc 2.x based distribution. */ +typedef struct { + short magic; + short vstamp; + int ilineMax; + int idnMax; + int ipdMax; + int isymMax; + int ioptMax; + int iauxMax; + int issMax; + int issExtMax; + int ifdMax; + int crfd; + int iextMax; + long cbLine; + long cbLineOffset; + long cbDnOffset; + long cbPdOffset; + long cbSymOffset; + long cbOptOffset; + long cbAuxOffset; + long cbSsOffset; + long cbSsExtOffset; + long cbFdOffset; + long cbRfdOffset; + long cbExtOffset; +} HDRR, *pHDRR; +#define cbHDRR sizeof(HDRR) +#define hdrNil ((pHDRR)0) +#endif + +#ifdef __NetBSD__ +/* + * NetBSD does not have normal-looking user-land ELF support. + */ +# include + +# ifndef PT_LOAD +# define PT_LOAD Elf_pt_load +# if 0 /* was in pkgsrc patches for 20.7 */ +# define SHT_PROGBITS Elf_sht_progbits +# endif +# define SHT_SYMTAB Elf_sht_symtab +# define SHT_DYNSYM Elf_sht_dynsym +# define SHT_NULL Elf_sht_null +# define SHT_NOBITS Elf_sht_nobits +# define SHT_REL Elf_sht_rel +# define SHT_RELA Elf_sht_rela + +# define SHN_UNDEF Elf_eshn_undefined +# define SHN_ABS Elf_eshn_absolute +# define SHN_COMMON Elf_eshn_common +# endif /* !PT_LOAD */ + +#endif /* __NetBSD__ */ + +#ifdef __OpenBSD__ +# include +#endif + +#if __GNU_LIBRARY__ - 0 >= 6 +# include /* get ElfW etc */ +#endif + +#ifndef ElfW +# ifdef __STDC__ +# define ElfBitsW(bits, type) Elf##bits##_##type +# else +# define ElfBitsW(bits, type) Elf/**/bits/**/_/**/type +# endif +# ifndef ELFSIZE +# ifdef _LP64 +# define ELFSIZE 64 +# else +# define ELFSIZE 32 +# endif +# endif + /* This macro expands `bits' before invoking ElfBitsW. */ +# define ElfExpandBitsW(bits, type) ElfBitsW (bits, type) +# define ElfW(type) ElfExpandBitsW (ELFSIZE, type) #endif #ifndef ELF_BSS_SECTION_NAME @@ -433,15 +557,38 @@ extern void fatal (char *, ...); /* Get the address of a particular section or program header entry, * accounting for the size of the entries. */ +/* + On PPC Reference Platform running Solaris 2.5.1 + the plt section is also of type NOBI like the bss section. + (not really stored) and therefore sections after the bss + section start at the plt offset. The plt section is always + the one just before the bss section. + Thus, we modify the test from + if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset) + to + if (NEW_SECTION_H (nn).sh_offset >= + OLD_SECTION_H (old_bss_index-1).sh_offset) + This is just a hack. We should put the new data section + before the .plt section. + And we should not have this routine at all but use + the libelf library to read the old file and create the new + file. + The changed code is minimal and depends on prep set in m/prep.h + Erik Deumens + Quantum Theory Project + University of Florida + deumens@qtp.ufl.edu + Apr 23, 1996 + */ #define OLD_SECTION_H(n) \ - (*(Elf32_Shdr *) ((byte *) old_section_h + old_file_h->e_shentsize * (n))) + (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n))) #define NEW_SECTION_H(n) \ - (*(Elf32_Shdr *) ((byte *) new_section_h + new_file_h->e_shentsize * (n))) + (*(ElfW(Shdr) *) ((byte *) new_section_h + new_file_h->e_shentsize * (n))) #define OLD_PROGRAM_H(n) \ - (*(Elf32_Phdr *) ((byte *) old_program_h + old_file_h->e_phentsize * (n))) + (*(ElfW(Phdr) *) ((byte *) old_program_h + old_file_h->e_phentsize * (n))) #define NEW_PROGRAM_H(n) \ - (*(Elf32_Phdr *) ((byte *) new_program_h + new_file_h->e_phentsize * (n))) + (*(ElfW(Phdr) *) ((byte *) new_program_h + new_file_h->e_phentsize * (n))) #define PATCH_INDEX(n) \ do { \ @@ -451,9 +598,8 @@ typedef unsigned char byte; /* Round X up to a multiple of Y. */ -int -round_up (x, y) - int x, y; +static ElfW(Addr) +round_up (ElfW(Addr) x, ElfW(Addr) y) { int rem = x % y; if (rem == 0) @@ -461,6 +607,39 @@ round_up (x, y) return x - rem + y; } +/* Return the index of the section named NAME. + SECTION_NAMES, FILE_NAME and FILE_H give information + about the file we are looking in. + + If we don't find the section NAME, that is a fatal error + if NOERROR is 0; we return -1 if NOERROR is nonzero. */ + +static int +find_section (char *name, char *section_names, char *file_name, ElfW(Ehdr) *old_file_h, ElfW(Shdr) *old_section_h, int noerror) +{ + int idx; + + for (idx = 1; idx < old_file_h->e_shnum; idx++) + { +#ifdef DEBUG + fprintf (stderr, "Looking for %s - found %s\n", name, + section_names + OLD_SECTION_H (idx).sh_name); +#endif + if (!strcmp (section_names + OLD_SECTION_H (idx).sh_name, + name)) + break; + } + if (idx == old_file_h->e_shnum) + { + if (noerror) + return -1; + else + fatal ("Can't find %s in %s.\n", name, file_name); + } + + return idx; +} + /* **************************************************************** * unexec * @@ -471,34 +650,45 @@ round_up (x, y) * */ void -unexec (new_name, old_name, data_start, bss_start, entry_address) - char *new_name, *old_name; - unsigned data_start, bss_start, entry_address; +unexec (char *new_name, char *old_name, unsigned data_start, unsigned bss_start, unsigned entry_address) { int new_file, old_file, new_file_size; /* Pointers to the base of the image of the two files. */ caddr_t old_base, new_base; +#if MAP_ANON == 0 + int mmap_fd; +#else +# define mmap_fd -1 +#endif + /* Pointers to the file, program and section headers for the old and new * files. */ - Elf32_Ehdr *old_file_h, *new_file_h; - Elf32_Phdr *old_program_h, *new_program_h; - Elf32_Shdr *old_section_h, *new_section_h; + ElfW(Ehdr) *old_file_h, *new_file_h; + ElfW(Phdr) *old_program_h, *new_program_h; + ElfW(Shdr) *old_section_h, *new_section_h; /* Point to the section name table in the old file */ char *old_section_names; - Elf32_Addr old_bss_addr, new_bss_addr; - Elf32_Word old_bss_size, new_data2_size; - Elf32_Off new_data2_offset; - Elf32_Addr new_data2_addr; - - int n, nn, old_bss_index, old_data_index, new_data2_index; + ElfW(Addr) old_bss_addr, new_bss_addr; + ElfW(Word) old_bss_size, new_data2_size; + ElfW(Off) new_data2_offset; + ElfW(Addr) new_data2_addr; + ElfW(Off) old_bss_offset; + ElfW(Word) new_data2_incr, new_data2_shincr; + + int n, nn; + int old_bss_index, old_sbss_index; + int old_data_index, new_data2_index; + int old_mdebug_index; struct stat stat_buf; + int old_file_size; - /* Open the old file & map it into the address space. */ + /* Open the old file, allocate a buffer of the right size, and read + * in the file contents. */ old_file = open (old_name, O_RDONLY); @@ -508,90 +698,127 @@ unexec (new_name, old_name, data_start, if (fstat (old_file, &stat_buf) == -1) fatal ("Can't fstat (%s): errno %d\n", old_name, errno); - old_base = mmap (0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0); +#if MAP_ANON == 0 + mmap_fd = open ("/dev/zero", O_RDONLY); + if (mmap_fd < 0) + fatal ("Can't open /dev/zero for reading: errno %d\n", errno); +#endif - if (old_base == (caddr_t) -1) - fatal ("Can't mmap (%s): errno %d\n", old_name, errno); + /* We cannot use malloc here because that may use sbrk. If it does, + we'd dump our temporary buffers with Emacs, and we'd have to be + extra careful to use the correct value of sbrk(0) after + allocating all buffers in the code below, which we aren't. */ + old_file_size = stat_buf.st_size; + old_base = mmap (NULL, old_file_size, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE, mmap_fd, 0); + if (old_base == MAP_FAILED) + fatal ("Can't allocate buffer for %s\n", old_name); -#ifdef DEBUG - fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size, - old_base); -#endif + if (read (old_file, old_base, stat_buf.st_size) != stat_buf.st_size) + fatal ("Didn't read all of %s: errno %d\n", old_name, errno); /* Get pointers to headers & section names */ - old_file_h = (Elf32_Ehdr *) old_base; - old_program_h = (Elf32_Phdr *) ((byte *) old_base + old_file_h->e_phoff); - old_section_h = (Elf32_Shdr *) ((byte *) old_base + old_file_h->e_shoff); + old_file_h = (ElfW(Ehdr) *) old_base; + old_program_h = (ElfW(Phdr) *) ((byte *) old_base + old_file_h->e_phoff); + old_section_h = (ElfW(Shdr) *) ((byte *) old_base + old_file_h->e_shoff); old_section_names = (char *) old_base + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset; + /* Find the mdebug section, if any. */ + + old_mdebug_index = find_section (".mdebug", old_section_names, + old_name, old_file_h, old_section_h, 1); + /* Find the old .bss section. Figure out parameters of the new * data2 and bss sections. */ - for (old_bss_index = 1; old_bss_index < (int) old_file_h->e_shnum; - old_bss_index++) + old_bss_index = find_section (".bss", old_section_names, + old_name, old_file_h, old_section_h, 0); + + old_sbss_index = find_section (".sbss", old_section_names, + old_name, old_file_h, old_section_h, 1); + if (old_sbss_index != -1) + if (OLD_SECTION_H (old_sbss_index).sh_type == SHT_PROGBITS) + old_sbss_index = -1; + + if (old_sbss_index == -1) { -#ifdef DEBUG - fprintf (stderr, "Looking for .bss - found %s\n", - old_section_names + OLD_SECTION_H (old_bss_index).sh_name); -#endif - if (!strcmp (old_section_names + OLD_SECTION_H (old_bss_index).sh_name, - ELF_BSS_SECTION_NAME)) - break; + old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr; + old_bss_size = OLD_SECTION_H (old_bss_index).sh_size; + old_bss_offset = OLD_SECTION_H (old_bss_index).sh_offset; + new_data2_index = old_bss_index; + } + else + { + old_bss_addr = OLD_SECTION_H (old_sbss_index).sh_addr; + old_bss_size = OLD_SECTION_H (old_bss_index).sh_size + + OLD_SECTION_H (old_sbss_index).sh_size; + old_bss_offset = OLD_SECTION_H (old_sbss_index).sh_offset; + new_data2_index = old_sbss_index; } - if (old_bss_index == old_file_h->e_shnum) - fatal ("Can't find .bss in %s.\n", old_name, 0); - old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr; - old_bss_size = OLD_SECTION_H (old_bss_index).sh_size; -#if defined(emacs) || !defined(DEBUG) - new_bss_addr = (Elf32_Addr) sbrk (0); + /* Find the old .data section. Figure out parameters of + the new data2 and bss sections. */ + + old_data_index = find_section (".data", old_section_names, + old_name, old_file_h, old_section_h, 0); + +#if defined (emacs) || !defined (DEBUG) + new_bss_addr = (ElfW(Addr)) sbrk (0); #else new_bss_addr = old_bss_addr + old_bss_size + 0x1234; #endif new_data2_addr = old_bss_addr; new_data2_size = new_bss_addr - old_bss_addr; - new_data2_offset = OLD_SECTION_H (old_bss_index).sh_offset; + new_data2_offset = OLD_SECTION_H (old_data_index).sh_offset + + (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr); + /* This is the amount by which the sections following the bss sections + must be shifted in the image. It can differ from new_data2_size if + the end of the old .data section (and thus the offset of the .bss + section) was unaligned. */ + new_data2_incr = new_data2_size + (new_data2_offset - old_bss_offset); + new_data2_shincr = round_up(new_data2_incr, old_program_h->p_align); #ifdef DEBUG fprintf (stderr, "old_bss_index %d\n", old_bss_index); fprintf (stderr, "old_bss_addr %x\n", old_bss_addr); fprintf (stderr, "old_bss_size %x\n", old_bss_size); + fprintf (stderr, "old_bss_offset %x\n", old_bss_offset); fprintf (stderr, "new_bss_addr %x\n", new_bss_addr); fprintf (stderr, "new_data2_addr %x\n", new_data2_addr); fprintf (stderr, "new_data2_size %x\n", new_data2_size); fprintf (stderr, "new_data2_offset %x\n", new_data2_offset); + fprintf (stderr, "new_data2_incr %x\n", new_data2_incr); #endif if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size) fatal (".bss shrank when undumping???\n", 0, 0); - /* Set the output file to the right size and mmap it. Set - * pointers to various interesting objects. stat_buf still has - * old_file data. + /* Set the output file to the right size. Allocate a buffer to hold + * the image of the new file. Set pointers to various interesting + * objects. stat_buf still has old_file data. */ new_file = open (new_name, O_RDWR | O_CREAT, 0666); if (new_file < 0) fatal ("Can't creat (%s): errno %d\n", new_name, errno); - new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_size; + new_file_size = stat_buf.st_size + old_file_h->e_shentsize + new_data2_shincr; if (ftruncate (new_file, new_file_size)) fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno); - new_base = mmap (0, new_file_size, PROT_READ | PROT_WRITE, MAP_SHARED, - new_file, 0); - - if (new_base == (caddr_t) -1) - fatal ("Can't mmap (%s): errno %d\n", new_name, errno); - - new_file_h = (Elf32_Ehdr *) new_base; - new_program_h = (Elf32_Phdr *) ((byte *) new_base + old_file_h->e_phoff); - new_section_h = (Elf32_Shdr *) - ((byte *) new_base + old_file_h->e_shoff + new_data2_size); + new_base = mmap (NULL, new_file_size, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE, mmap_fd, 0); + if (new_base == MAP_FAILED) + fatal ("Can't allocate buffer for %s\n", old_name); + + new_file_h = (ElfW(Ehdr) *) new_base; + new_program_h = (ElfW(Phdr) *) ((byte *) new_base + old_file_h->e_phoff); + new_section_h = (ElfW(Shdr) *) + ((byte *) new_base + old_file_h->e_shoff + new_data2_shincr); /* Make our new file, program and section headers as copies of the * originals. @@ -608,7 +835,7 @@ unexec (new_name, old_name, data_start, * further away now. */ - new_file_h->e_shoff += new_data2_size; + new_file_h->e_shoff += new_data2_shincr; new_file_h->e_shnum += 1; #ifdef DEBUG @@ -629,12 +856,22 @@ unexec (new_name, old_name, data_start, for (n = new_file_h->e_phnum - 1; n >= 0; n--) { /* Compute maximum of all requirements for alignment of section. */ - int alignment = (NEW_PROGRAM_H (n)).p_align; + ElfW(Word) alignment = (NEW_PROGRAM_H (n)).p_align; if ((OLD_SECTION_H (old_bss_index)).sh_addralign > alignment) alignment = OLD_SECTION_H (old_bss_index).sh_addralign; - if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz > old_bss_addr) - fatal ("Program segment above .bss in %s\n", old_name, 0); +#ifdef __sgi + /* According to r02kar@x4u2.desy.de (Karsten Kuenne) + and oliva@gnu.org (Alexandre Oliva), on IRIX 5.2, we + always get "Program segment above .bss" when dumping + when the executable doesn't have an sbss section. */ + if (old_sbss_index != -1) +#endif /* __sgi */ + if (NEW_PROGRAM_H (n).p_vaddr + NEW_PROGRAM_H (n).p_filesz + > (old_sbss_index == -1 + ? old_bss_addr + : round_up (old_bss_addr, alignment))) + fatal ("Program segment above .bss in %s\n", old_name, 0); if (NEW_PROGRAM_H (n).p_type == PT_LOAD && (round_up ((NEW_PROGRAM_H (n)).p_vaddr @@ -646,10 +883,12 @@ unexec (new_name, old_name, data_start, if (n < 0) fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0); - NEW_PROGRAM_H (n).p_filesz += new_data2_size; + /* Make sure that the size includes any padding before the old .bss + section. */ + NEW_PROGRAM_H (n).p_filesz = new_bss_addr - NEW_PROGRAM_H (n).p_vaddr; NEW_PROGRAM_H (n).p_memsz = NEW_PROGRAM_H (n).p_filesz; -#if 0 /* Maybe allow section after data2 - does this ever happen? */ +#ifdef IRIX5 /* allow section after data2 */ for (n = new_file_h->e_phnum - 1; n >= 0; n--) { if (NEW_PROGRAM_H (n).p_vaddr @@ -657,7 +896,7 @@ unexec (new_name, old_name, data_start, NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size; if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset) - NEW_PROGRAM_H (n).p_offset += new_data2_size; + NEW_PROGRAM_H (n).p_offset += new_data2_incr; } #endif @@ -675,18 +914,20 @@ unexec (new_name, old_name, data_start, if (old_data_index == old_file_h->e_shnum) fatal ("Can't find .data in %s.\n", old_name, 0); - /* Walk through all section headers, insert the new data2 section right + /* Walk through all section headers, insert the new data2 section right before the new bss section. */ for (n = 1, nn = 1; n < (int) old_file_h->e_shnum; n++, nn++) { caddr_t src; - /* If it is bss section, insert the new data2 section before it. */ - if (n == old_bss_index) + /* If it is (s)bss section, insert the new data2 section before it. */ + /* new_data2_index is the index of either old_sbss or old_bss, that was + chosen as a section for new_data2. */ + if (n == new_data2_index) { /* Steal the data section header for this data2 section. */ memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (old_data_index), new_file_h->e_shentsize); - + NEW_SECTION_H (nn).sh_addr = new_data2_addr; NEW_SECTION_H (nn).sh_offset = new_data2_offset; NEW_SECTION_H (nn).sh_size = new_data2_size; @@ -696,73 +937,235 @@ unexec (new_name, old_name, data_start, NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (n).sh_addralign; /* Now copy over what we have in the memory now. */ - memcpy (NEW_SECTION_H (nn).sh_offset + new_base, - (caddr_t) OLD_SECTION_H (n).sh_addr, + memcpy (NEW_SECTION_H (nn).sh_offset + new_base, + (caddr_t) OLD_SECTION_H (n).sh_addr, new_data2_size); nn++; } - - memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n), + + memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n), old_file_h->e_shentsize); - - /* The new bss section's size is zero, and its file offset and virtual - address should be off by NEW_DATA2_SIZE. */ - if (n == old_bss_index) + + if (n == old_bss_index + /* The new bss and sbss section's size is zero, and its file offset + and virtual address should be off by NEW_DATA2_SIZE. */ + || n == old_sbss_index + ) { - /* NN should be `old_bss_index + 1' at this point. */ - NEW_SECTION_H (nn).sh_offset += new_data2_size; - NEW_SECTION_H (nn).sh_addr += new_data2_size; + /* NN should be `old_s?bss_index + 1' at this point. */ + NEW_SECTION_H (nn).sh_offset = new_data2_offset + new_data2_size; + NEW_SECTION_H (nn).sh_addr = new_data2_addr + new_data2_size; /* Let the new bss section address alignment be the same as the - section address alignment followed the old bss section, so + section address alignment followed the old bss section, so this section will be placed in exactly the same place. */ NEW_SECTION_H (nn).sh_addralign = OLD_SECTION_H (nn).sh_addralign; NEW_SECTION_H (nn).sh_size = 0; } - /* Any section that was original placed AFTER the bss section should now - be off by NEW_DATA2_SIZE. */ - else if (NEW_SECTION_H (nn).sh_offset >= new_data2_offset) - NEW_SECTION_H (nn).sh_offset += new_data2_size; - + else + { + /* Any section that was original placed AFTER the bss + section should now be off by NEW_DATA2_INCR. If a + section overlaps the .bss section, consider it to be + placed after the .bss section. Overlap can occur if the + section just before .bss has less-strict alignment; this + was observed between .symtab and .bss on Solaris 2.5.1 + (sparc) with GCC snapshot 960602. */ +#ifdef SOLARIS_POWERPC + /* On PPC Reference Platform running Solaris 2.5.1 + the plt section is also of type NOBI like the bss section. + (not really stored) and therefore sections after the bss + section start at the plt offset. The plt section is always + the one just before the bss section. + It would be better to put the new data section before + the .plt section, or use libelf instead. + Erik Deumens, deumens@qtp.ufl.edu. */ + if (NEW_SECTION_H (nn).sh_offset + >= OLD_SECTION_H (old_bss_index-1).sh_offset) + NEW_SECTION_H (nn).sh_offset += new_data2_incr; +#else + if (NEW_SECTION_H (nn).sh_offset >= old_bss_offset) + NEW_SECTION_H (nn).sh_offset += new_data2_incr; +#endif + /* Any section that was originally placed after the section + header table should now be off by the size of one section + header table entry. */ + if (NEW_SECTION_H (nn).sh_offset > new_file_h->e_shoff) + NEW_SECTION_H (nn).sh_offset += new_file_h->e_shentsize; + } + /* If any section hdr refers to the section after the new .data - section, make it refer to next one because we have inserted + section, make it refer to next one because we have inserted a new section in between. */ - + PATCH_INDEX (NEW_SECTION_H (nn).sh_link); /* For symbol tables, info is a symbol table index, so don't change it. */ if (NEW_SECTION_H (nn).sh_type != SHT_SYMTAB && NEW_SECTION_H (nn).sh_type != SHT_DYNSYM) PATCH_INDEX (NEW_SECTION_H (nn).sh_info); + + if (old_sbss_index != -1) + if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".sbss")) + { + NEW_SECTION_H (nn).sh_offset = + round_up (NEW_SECTION_H (nn).sh_offset, + NEW_SECTION_H (nn).sh_addralign); + NEW_SECTION_H (nn).sh_type = SHT_PROGBITS; + } /* Now, start to copy the content of sections. */ if (NEW_SECTION_H (nn).sh_type == SHT_NULL || NEW_SECTION_H (nn).sh_type == SHT_NOBITS) continue; - + /* Write out the sections. .data and .data1 (and data2, called ".data" in the strings table) get copied from the current process instead of the old file. */ if (!strcmp (old_section_names + NEW_SECTION_H (n).sh_name, ".data") -#ifdef _nec_ews_svr4 /* hir, 1994.6.13 */ - || !strcmp ((old_section_names + NEW_SECTION_H(n).sh_name), + || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), ".sdata") + || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), + ".lit4") + || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), + ".lit8") + /* The conditional bit below was in Oliva's original code + (1999-08-25) and seems to have been dropped by mistake + subsequently. It prevents a crash at startup under X in + `IRIX64 6.5 6.5.17m' with c_dev 7.3.1.3m. It causes no + trouble on the other ELF platforms I could test (Irix + 6.5.15m, Solaris 8, Debian Potato x86, Debian Woody + SPARC); however, it's reported to cause crashes under + some version of GNU/Linux. It's not yet clear what's + changed in that Irix version to cause the problem, or why + the fix sometimes fails under GNU/Linux. There's + probably no good reason to have something Irix-specific + here, but this will have to do for now. IRIX6_5 is the + most specific macro we have to test. -- fx 2002-10-01 */ +#ifdef IRIX6_5 + || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), + ".got") #endif || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), - ".data1")) + ".sdata1") + || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), + ".data1") + || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), + ".sbss")) src = (caddr_t) OLD_SECTION_H (n).sh_addr; else src = old_base + OLD_SECTION_H (n).sh_offset; - + memcpy (NEW_SECTION_H (nn).sh_offset + new_base, src, NEW_SECTION_H (nn).sh_size); +#if defined(__alpha__) && !defined(__NetBSD__) + /* Update Alpha COFF symbol table: */ + if (strcmp (old_section_names + OLD_SECTION_H (n).sh_name, ".mdebug") + == 0) + { + pHDRR symhdr = (pHDRR) (NEW_SECTION_H (nn).sh_offset + new_base); + + symhdr->cbLineOffset += new_data2_size; + symhdr->cbDnOffset += new_data2_size; + symhdr->cbPdOffset += new_data2_size; + symhdr->cbSymOffset += new_data2_size; + symhdr->cbOptOffset += new_data2_size; + symhdr->cbAuxOffset += new_data2_size; + symhdr->cbSsOffset += new_data2_size; + symhdr->cbSsExtOffset += new_data2_size; + symhdr->cbFdOffset += new_data2_size; + symhdr->cbRfdOffset += new_data2_size; + symhdr->cbExtOffset += new_data2_size; + } +#endif /* __alpha__ */ + +#if defined (__sony_news) && defined (_SYSTYPE_SYSV) + if (NEW_SECTION_H (nn).sh_type == SHT_MIPS_DEBUG + && old_mdebug_index != -1) + { + int diff = NEW_SECTION_H(nn).sh_offset + - OLD_SECTION_H(old_mdebug_index).sh_offset; + HDRR *phdr = (HDRR *)(NEW_SECTION_H (nn).sh_offset + new_base); + + if (diff) + { + phdr->cbLineOffset += diff; + phdr->cbDnOffset += diff; + phdr->cbPdOffset += diff; + phdr->cbSymOffset += diff; + phdr->cbOptOffset += diff; + phdr->cbAuxOffset += diff; + phdr->cbSsOffset += diff; + phdr->cbSsExtOffset += diff; + phdr->cbFdOffset += diff; + phdr->cbRfdOffset += diff; + phdr->cbExtOffset += diff; + } + } +#endif /* __sony_news && _SYSTYPE_SYSV */ + +#if __sgi + /* Adjust the HDRR offsets in .mdebug and copy the + line data if it's in its usual 'hole' in the object. + Makes the new file debuggable with dbx. + patches up two problems: the absolute file offsets + in the HDRR record of .mdebug (see /usr/include/syms.h), and + the ld bug that gets the line table in a hole in the + elf file rather than in the .mdebug section proper. + David Anderson. davea@sgi.com Jan 16,1994. */ + if (n == old_mdebug_index) + { +#define MDEBUGADJUST(__ct,__fileaddr) \ + if (n_phdrr->__ct > 0) \ + { \ + n_phdrr->__fileaddr += movement; \ + } + + HDRR * o_phdrr = (HDRR *)((byte *)old_base + OLD_SECTION_H (n).sh_offset); + HDRR * n_phdrr = (HDRR *)((byte *)new_base + NEW_SECTION_H (nn).sh_offset); + unsigned movement = new_data2_size; + + MDEBUGADJUST (idnMax, cbDnOffset); + MDEBUGADJUST (ipdMax, cbPdOffset); + MDEBUGADJUST (isymMax, cbSymOffset); + MDEBUGADJUST (ioptMax, cbOptOffset); + MDEBUGADJUST (iauxMax, cbAuxOffset); + MDEBUGADJUST (issMax, cbSsOffset); + MDEBUGADJUST (issExtMax, cbSsExtOffset); + MDEBUGADJUST (ifdMax, cbFdOffset); + MDEBUGADJUST (crfd, cbRfdOffset); + MDEBUGADJUST (iextMax, cbExtOffset); + /* The Line Section, being possible off in a hole of the object, + requires special handling. */ + if (n_phdrr->cbLine > 0) + { + if (o_phdrr->cbLineOffset > (OLD_SECTION_H (n).sh_offset + + OLD_SECTION_H (n).sh_size)) + { + /* line data is in a hole in elf. do special copy and adjust + for this ld mistake. + */ + n_phdrr->cbLineOffset += movement; + + memcpy (n_phdrr->cbLineOffset + new_base, + o_phdrr->cbLineOffset + old_base, n_phdrr->cbLine); + } + else + { + /* somehow line data is in .mdebug as it is supposed to be. */ + MDEBUGADJUST (cbLine, cbLineOffset); + } + } + } +#endif /* __sgi */ + /* If it is the symbol table, its st_shndx field needs to be patched. */ if (NEW_SECTION_H (nn).sh_type == SHT_SYMTAB || NEW_SECTION_H (nn).sh_type == SHT_DYNSYM) { - Elf32_Shdr *spt = &NEW_SECTION_H (nn); + ElfW(Shdr) *spt = &NEW_SECTION_H (nn); unsigned int num = spt->sh_size / spt->sh_entsize; - Elf32_Sym * sym = (Elf32_Sym *) (NEW_SECTION_H (nn).sh_offset + + ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset + new_base); for (; num--; sym++) { @@ -770,7 +1173,7 @@ unexec (new_name, old_name, data_start, || (sym->st_shndx == SHN_ABS) || (sym->st_shndx == SHN_COMMON)) continue; - + PATCH_INDEX (sym->st_shndx); } } @@ -780,30 +1183,101 @@ unexec (new_name, old_name, data_start, for (n = new_file_h->e_shnum - 1; n; n--) { byte *symnames; - Elf32_Sym *symp, *symendp; + ElfW(Sym) *symp, *symendp; if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM && NEW_SECTION_H (n).sh_type != SHT_SYMTAB) continue; - symnames = NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset + new_base; - symp = (Elf32_Sym *) (NEW_SECTION_H (n).sh_offset + new_base); - symendp = (Elf32_Sym *) ((byte *)symp + NEW_SECTION_H (n).sh_size); + symnames = ((byte *) new_base + + NEW_SECTION_H (NEW_SECTION_H (n).sh_link).sh_offset); + symp = (ElfW(Sym) *) (NEW_SECTION_H (n).sh_offset + new_base); + symendp = (ElfW(Sym) *) ((byte *)symp + NEW_SECTION_H (n).sh_size); for (; symp < symendp; symp ++) if (strcmp ((char *) (symnames + symp->st_name), "_end") == 0 - || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0) + || strcmp ((char *) (symnames + symp->st_name), "end") == 0 + || strcmp ((char *) (symnames + symp->st_name), "_edata") == 0 + || strcmp ((char *) (symnames + symp->st_name), "edata") == 0) memcpy (&symp->st_value, &new_bss_addr, sizeof (new_bss_addr)); } - /* Close the files and make the new file executable. */ + /* This loop seeks out relocation sections for the data section, so + that it can undo relocations performed by the runtime linker. */ + for (n = new_file_h->e_shnum - 1; n; n--) + { + ElfW(Shdr) section = NEW_SECTION_H (n); + switch (section.sh_type) { + default: + break; + case SHT_REL: + case SHT_RELA: + /* This code handles two different size structs, but there should + be no harm in that provided that r_offset is always the first + member. */ + nn = section.sh_info; + if (!strcmp (old_section_names + NEW_SECTION_H (nn).sh_name, ".data") + || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), + ".sdata") + || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), + ".lit4") + || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), + ".lit8") +#ifdef IRIX6_5 /* see above */ + || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), + ".got") +#endif + || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), + ".sdata1") + || !strcmp ((old_section_names + NEW_SECTION_H (nn).sh_name), + ".data1")) + { + ElfW(Addr) offset = NEW_SECTION_H (nn).sh_addr - + NEW_SECTION_H (nn).sh_offset; + caddr_t reloc = old_base + section.sh_offset, end; + for (end = reloc + section.sh_size; reloc < end; + reloc += section.sh_entsize) + { + ElfW(Addr) addr = ((ElfW(Rel) *) reloc)->r_offset - offset; +#ifdef __alpha__ + /* The Alpha ELF binutils currently have a bug that + sometimes results in relocs that contain all + zeroes. Work around this for now... */ + if (((ElfW(Rel) *) reloc)->r_offset == 0) + continue; +#endif + memcpy (new_base + addr, old_base + addr, sizeof(ElfW(Addr))); + } + } + break; + } + } - if (close (old_file)) - fatal ("Can't close (%s): errno %d\n", old_name, errno); + /* Write out new_file, close it, and free the buffer containing its + * contents */ + + if (write (new_file, new_base, new_file_size) != new_file_size) + fatal ("Didn't write %d bytes to %s: errno %d\n", + new_file_size, new_base, errno); if (close (new_file)) fatal ("Can't close (%s): errno %d\n", new_name, errno); + munmap (new_base, new_file_size); + + /* Close old_file, and free the corresponding buffer */ + +#if MAP_ANON == 0 + close (mmap_fd); +#endif + + if (close (old_file)) + fatal ("Can't close (%s): errno %d\n", old_name, errno); + + munmap (old_base, old_file_size); + + /* Make the new file executable */ + if (stat (new_name, &stat_buf) == -1) fatal ("Can't stat (%s): errno %d\n", new_name, errno);