X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=src%2Funexelfsgi.c;h=95844f3cfa684a0aaa1ebad4869cefb634b14efe;hb=2e10d25ce0c122f8a7048e21898344d7d9ec368b;hp=ad54ccf5f587d6dad34d5287ab4189a18604ba02;hpb=98a6e4055a1fa624c592ac06f79287d55196ca37;p=chise%2Fxemacs-chise.git.1 diff --git a/src/unexelfsgi.c b/src/unexelfsgi.c index ad54ccf..95844f3 100644 --- a/src/unexelfsgi.c +++ b/src/unexelfsgi.c @@ -1,38 +1,27 @@ /* Copyright (C) 1985, 1986, 1987, 1988, 1990, 1992, 1999, 2000 Free Software Foundation, Inc. -This file is part of XEmacs. + This file is part of XEmacs. -XEmacs 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. + XEmacs 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. + 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. + 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 -what you give them. Help stamp out software-hoarding! */ + 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 what you give them. Help stamp out software-hoarding! */ -/* 2000-10-31: Martin Buchholz - - I noticed that xemacs on Irix 6.5 could not write to stderr, e.g. - (external-debugging-output "\n") - would produce NO output. - temacs worked fine, so this was clearly a dumping problem. - - So I copied over the latest available unexelf.c from FSF Emacs, - and installed it as unexelfsgi.c in XEmacs. - In addition, I converted it to "Clean C", resulting in this file. -*/ /* * unexec.c - Convert a running program into an a.out file. @@ -44,375 +33,40 @@ what you give them. Help stamp out software-hoarding! */ * Modified heavily since then. * * Synopsis: - * 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 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. + * void + * unexec (char *new_name, + * char *old_name, + * uintptr_t data_start, + * uintptr_t bss_start, + * uintptr_t entry_address) * - * Data_start gives the boundary between the text segment and the data - * segment of the program. The text segment can contain shared, read-only - * program code and literal data, while the data segment is always unshared - * and unprotected. Data_start gives the lowest unprotected address. - * The value you specify may be rounded down to a suitable boundary - * as required by the machine you are using. + * The basic idea is that we start with an ELF file which contains + * .bss (uninitialized global data) section which is normally not in + * the file. As we load lisp the variables, which were first set to 0, + * will change their values. We want to save those changed values into + * another ELF file, which will become a new xemacs image. To do this, + * we need to change several structures in the ELF file. * - * 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 - * is given assumes that the entire data segment is to be stored, including - * the previous data and bss as well as any additional storage allocated with - * break (2). + * First of all, we need to change the programm header which tells + * the linker how to load stuff into memory so that data will come + * from the file and not from the /dev/zero. To do this, we find the + * segment, which is marked as loadable (type PT_LOAD) and which + * covers the old .bss section. We will next change the filesz and + * memsz for that segment to extend over the new data section. * - * The new file is set up to start at entry_address. - * - */ - -/* Even more heavily modified by james@bigtex.cactus.org of Dell Computer Co. - * ELF support added. + * Next we have to make sure that section header for the stuff which + * used to be uninitialized is changed to be initialized and to come + * from the file. To do this, we change the size and the type of the old + * .bss section (and all other section of the type SHT_NOBITS) to cover the + * new section and to be of type SHT_PROCBITS. * - * Basic theory: the data space of the running process needs to be - * dumped to the output file. Normally we would just enlarge the size - * of .data, scooting everything down. But we can't do that in ELF, - * because there is often something between the .data space and the - * .bss space. + * We also insert a new SHT_NOBITS section to keep some tools, which expect + * .bss happy. * - * In the temacs dump below, notice that the Global Offset Table - * (.got) and the Dynamic link data (.dynamic) come between .data1 and - * .bss. It does not work to overlap .data with these fields. - * - * The solution is to create a new .data segment. This segment is - * filled with data from the current process. Since the contents of - * various sections refer to sections by index, the new .data segment - * is made the last in the table to avoid changing any existing index. - - * This is an example of how the section headers are changed. "Addr" - * is a process virtual address. "Offset" is a file offset. - -raid:/nfs/raid/src/dist-18.56/src> dump -h temacs - -temacs: - - **** SECTION HEADER TABLE **** -[No] Type Flags Addr Offset Size Name - Link Info Adralgn Entsize - -[1] 1 2 0x80480d4 0xd4 0x13 .interp - 0 0 0x1 0 - -[2] 5 2 0x80480e8 0xe8 0x388 .hash - 3 0 0x4 0x4 - -[3] 11 2 0x8048470 0x470 0x7f0 .dynsym - 4 1 0x4 0x10 - -[4] 3 2 0x8048c60 0xc60 0x3ad .dynstr - 0 0 0x1 0 - -[5] 9 2 0x8049010 0x1010 0x338 .rel.plt - 3 7 0x4 0x8 - -[6] 1 6 0x8049348 0x1348 0x3 .init - 0 0 0x4 0 - -[7] 1 6 0x804934c 0x134c 0x680 .plt - 0 0 0x4 0x4 - -[8] 1 6 0x80499cc 0x19cc 0x3c56f .text - 0 0 0x4 0 - -[9] 1 6 0x8085f3c 0x3df3c 0x3 .fini - 0 0 0x4 0 - -[10] 1 2 0x8085f40 0x3df40 0x69c .rodata - 0 0 0x4 0 - -[11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 - 0 0 0x4 0 - -[12] 1 3 0x8088330 0x3f330 0x20afc .data - 0 0 0x4 0 - -[13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 - 0 0 0x4 0 - -[14] 1 3 0x80a96cc 0x606cc 0x1a8 .got - 0 0 0x4 0x4 - -[15] 6 3 0x80a9874 0x60874 0x80 .dynamic - 4 0 0x4 0x8 - -[16] 8 3 0x80a98f4 0x608f4 0x449c .bss - 0 0 0x4 0 - -[17] 2 0 0 0x608f4 0x9b90 .symtab - 18 371 0x4 0x10 - -[18] 3 0 0 0x6a484 0x8526 .strtab - 0 0 0x1 0 - -[19] 3 0 0 0x729aa 0x93 .shstrtab - 0 0 0x1 0 - -[20] 1 0 0 0x72a3d 0x68b7 .comment - 0 0 0x1 0 - -raid:/nfs/raid/src/dist-18.56/src> dump -h xemacs - -xemacs: - - **** SECTION HEADER TABLE **** -[No] Type Flags Addr Offset Size Name - Link Info Adralgn Entsize - -[1] 1 2 0x80480d4 0xd4 0x13 .interp - 0 0 0x1 0 - -[2] 5 2 0x80480e8 0xe8 0x388 .hash - 3 0 0x4 0x4 - -[3] 11 2 0x8048470 0x470 0x7f0 .dynsym - 4 1 0x4 0x10 - -[4] 3 2 0x8048c60 0xc60 0x3ad .dynstr - 0 0 0x1 0 - -[5] 9 2 0x8049010 0x1010 0x338 .rel.plt - 3 7 0x4 0x8 - -[6] 1 6 0x8049348 0x1348 0x3 .init - 0 0 0x4 0 - -[7] 1 6 0x804934c 0x134c 0x680 .plt - 0 0 0x4 0x4 - -[8] 1 6 0x80499cc 0x19cc 0x3c56f .text - 0 0 0x4 0 - -[9] 1 6 0x8085f3c 0x3df3c 0x3 .fini - 0 0 0x4 0 - -[10] 1 2 0x8085f40 0x3df40 0x69c .rodata - 0 0 0x4 0 - -[11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 - 0 0 0x4 0 - -[12] 1 3 0x8088330 0x3f330 0x20afc .data - 0 0 0x4 0 - -[13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 - 0 0 0x4 0 - -[14] 1 3 0x80a96cc 0x606cc 0x1a8 .got - 0 0 0x4 0x4 - -[15] 6 3 0x80a9874 0x60874 0x80 .dynamic - 4 0 0x4 0x8 - -[16] 8 3 0x80c6800 0x7d800 0 .bss - 0 0 0x4 0 - -[17] 2 0 0 0x7d800 0x9b90 .symtab - 18 371 0x4 0x10 - -[18] 3 0 0 0x87390 0x8526 .strtab - 0 0 0x1 0 - -[19] 3 0 0 0x8f8b6 0x93 .shstrtab - 0 0 0x1 0 - -[20] 1 0 0 0x8f949 0x68b7 .comment - 0 0 0x1 0 - -[21] 1 3 0x80a98f4 0x608f4 0x1cf0c .data - 0 0 0x4 0 - - * This is an example of how the file header is changed. "Shoff" is - * the section header offset within the file. Since that table is - * after the new .data section, it is moved. "Shnum" is the number of - * sections, which we increment. - * - * "Phoff" is the file offset to the program header. "Phentsize" and - * "Shentsz" are the program and section header entries sizes respectively. - * These can be larger than the apparent struct sizes. - -raid:/nfs/raid/src/dist-18.56/src> dump -f temacs - -temacs: - - **** ELF HEADER **** -Class Data Type Machine Version -Entry Phoff Shoff Flags Ehsize -Phentsize Phnum Shentsz Shnum Shstrndx - -1 1 2 3 1 -0x80499cc 0x34 0x792f4 0 0x34 -0x20 5 0x28 21 19 - -raid:/nfs/raid/src/dist-18.56/src> dump -f xemacs - -xemacs: - - **** ELF HEADER **** -Class Data Type Machine Version -Entry Phoff Shoff Flags Ehsize -Phentsize Phnum Shentsz Shnum Shstrndx - -1 1 2 3 1 -0x80499cc 0x34 0x96200 0 0x34 -0x20 5 0x28 22 19 - - * These are the program headers. "Offset" is the file offset to the - * segment. "Vaddr" is the memory load address. "Filesz" is the - * segment size as it appears in the file, and "Memsz" is the size in - * memory. Below, the third segment is the code and the fourth is the - * data: the difference between Filesz and Memsz is .bss - -raid:/nfs/raid/src/dist-18.56/src> dump -o temacs - -temacs: - ***** PROGRAM EXECUTION HEADER ***** -Type Offset Vaddr Paddr -Filesz Memsz Flags Align - -6 0x34 0x8048034 0 -0xa0 0xa0 5 0 - -3 0xd4 0 0 -0x13 0 4 0 - -1 0x34 0x8048034 0 -0x3f2f9 0x3f2f9 5 0x1000 - -1 0x3f330 0x8088330 0 -0x215c4 0x25a60 7 0x1000 - -2 0x60874 0x80a9874 0 -0x80 0 7 0 - -raid:/nfs/raid/src/dist-18.56/src> dump -o xemacs - -xemacs: - ***** PROGRAM EXECUTION HEADER ***** -Type Offset Vaddr Paddr -Filesz Memsz Flags Align - -6 0x34 0x8048034 0 -0xa0 0xa0 5 0 - -3 0xd4 0 0 -0x13 0 4 0 - -1 0x34 0x8048034 0 -0x3f2f9 0x3f2f9 5 0x1000 - -1 0x3f330 0x8088330 0 -0x3e4d0 0x3e4d0 7 0x1000 - -2 0x60874 0x80a9874 0 -0x80 0 7 0 - - - */ - -/* 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 - * 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 - * 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 - * 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 - * 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. - * - * The above example now should look like: - - **** SECTION HEADER TABLE **** -[No] Type Flags Addr Offset Size Name - Link Info Adralgn Entsize - -[1] 1 2 0x80480d4 0xd4 0x13 .interp - 0 0 0x1 0 - -[2] 5 2 0x80480e8 0xe8 0x388 .hash - 3 0 0x4 0x4 - -[3] 11 2 0x8048470 0x470 0x7f0 .dynsym - 4 1 0x4 0x10 - -[4] 3 2 0x8048c60 0xc60 0x3ad .dynstr - 0 0 0x1 0 - -[5] 9 2 0x8049010 0x1010 0x338 .rel.plt - 3 7 0x4 0x8 - -[6] 1 6 0x8049348 0x1348 0x3 .init - 0 0 0x4 0 - -[7] 1 6 0x804934c 0x134c 0x680 .plt - 0 0 0x4 0x4 - -[8] 1 6 0x80499cc 0x19cc 0x3c56f .text - 0 0 0x4 0 - -[9] 1 6 0x8085f3c 0x3df3c 0x3 .fini - 0 0 0x4 0 - -[10] 1 2 0x8085f40 0x3df40 0x69c .rodata - 0 0 0x4 0 - -[11] 1 2 0x80865dc 0x3e5dc 0xd51 .rodata1 - 0 0 0x4 0 - -[12] 1 3 0x8088330 0x3f330 0x20afc .data - 0 0 0x4 0 - -[13] 1 3 0x80a8e2c 0x5fe2c 0x89d .data1 - 0 0 0x4 0 - -[14] 1 3 0x80a96cc 0x606cc 0x1a8 .got - 0 0 0x4 0x4 - -[15] 6 3 0x80a9874 0x60874 0x80 .dynamic - 4 0 0x4 0x8 - -[16] 1 3 0x80a98f4 0x608f4 0x1cf0c .data - 0 0 0x4 0 - -[17] 8 3 0x80c6800 0x7d800 0 .bss - 0 0 0x4 0 - -[18] 2 0 0 0x7d800 0x9b90 .symtab - 19 371 0x4 0x10 - -[19] 3 0 0 0x87390 0x8526 .strtab - 0 0 0x1 0 - -[20] 3 0 0 0x8f8b6 0x93 .shstrtab - 0 0 0x1 0 - -[21] 1 0 0 0x8f949 0x68b7 .comment - 0 0 0x1 0 - + * Finally we need to patch up some references to the section + * indexes since we change the order and undo the relocation info to + * be the same as it was "before" because we actually used the data + * from the memory which were changed by the run-time linker. */ #ifndef emacs @@ -430,7 +84,7 @@ extern void fatal (const char *, ...); #include #include #include -#if !defined (__NetBSD__) && !defined (__OpenBSD__) +#ifdef HAVE_ELF_H #include #endif #include @@ -442,85 +96,6 @@ extern void fatal (const char *, ...); #include /* for HDRR declaration */ #endif /* __sgi */ -#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. - */ -# if defined __alpha__ || defined __sparc_v9__ -# define ELFSIZE 64 -# else -# define ELFSIZE 32 -# endif -# 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 */ - -# ifdef __alpha__ -# include -# define HDRR struct ecoff_symhdr -# define pHDRR HDRR * -# endif /* __alpha__ */ - -#ifdef __mips__ /* was in pkgsrc patches for 20.7 */ -# define SHT_MIPS_DEBUG DT_MIPS_FLAGS -# define HDRR struct Elf_Shdr -#endif /* __mips__ */ -#endif /* __NetBSD__ */ - -#ifdef __OpenBSD__ -# include -#endif - #if __GNU_LIBRARY__ - 0 >= 6 # include /* get ElfW etc */ #endif @@ -546,31 +121,7 @@ typedef struct { #endif /* 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 - */ + * accounting for the size of the entries. */ #define OLD_SECTION_H(n) \ (*(ElfW(Shdr) *) ((byte *) old_section_h + old_file_h->e_shentsize * (n))) @@ -583,8 +134,9 @@ typedef struct { #define PATCH_INDEX(n) \ do { \ - if ((int) (n) >= old_bss_index) \ + if ((int) (n) >= growme_index) \ (n)++; } while (0) + typedef unsigned char byte; /* Round X up to a multiple of Y. */ @@ -607,7 +159,7 @@ round_up (ElfW(Addr) x, ElfW(Addr) y) static int find_section (char *name, - char *section_names, + const char *section_names, char *file_name, ElfW(Ehdr) *old_file_h, ElfW(Shdr) *old_section_h, @@ -623,17 +175,14 @@ find_section (char *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; } - return idx; + /* If we're here, we found nothing or return did not work */ + if ( ! noerror) + fatal ("Can't find %s in %s.\n", name, file_name); + + return -1; } /* **************************************************************** @@ -652,158 +201,98 @@ unexec (char *new_name, uintptr_t bss_start, uintptr_t entry_address) { - int new_file, old_file, new_file_size; + int old_file; - /* Pointers to the base of the image of the two files. */ + struct stat stat_buf; caddr_t old_base, new_base; - /* Pointers to the file, program and section headers for the old and new - * files. - */ - 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; - - 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(Ehdr) *old_file_h, * new_file_h; + ElfW(Phdr) *old_program_h, * new_program_h; + ElfW(Shdr) *old_section_h, * new_section_h; + ElfW(Shdr) * growme = NULL, * grown = NULL; + ElfW(Addr) old_bss_addr = 0, new_data2_addr = 0; + int growme_index = -1; 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; - - /* Open the old file & map it into the address space. */ + const char *old_section_names; + int old_mdebug_index, old_data_index; + int new_bss_addr, new_data2_size, new_data2_offset, new_file, new_file_size; - old_file = open (old_name, O_RDONLY); - - if (old_file < 0) - fatal ("Can't open %s for reading: errno %d\n", old_name, errno); + /* Open the old file */ + if ( (old_file = open (old_name, O_RDONLY)) < 0 ) + fatal ("Can't open %s for reading: errno %d\n", old_name, errno); if (fstat (old_file, &stat_buf) == -1) - fatal ("Can't fstat (%s): errno %d\n", old_name, errno); + fatal ("Can't fstat (%s): errno %d\n", old_name, errno); + /* map old file into the address space. */ old_base = (caddr_t) mmap ((caddr_t) 0, stat_buf.st_size, PROT_READ, MAP_SHARED, old_file, 0); - - if (old_base == (caddr_t) -1) + if (old_base == (caddr_t) MAP_FAILED) fatal ("Can't mmap (%s): errno %d\n", old_name, errno); -#ifdef DEBUG - fprintf (stderr, "mmap (%s, %x) -> %x\n", old_name, stat_buf.st_size, - old_base); -#endif - - /* Get pointers to headers & section names */ - - old_file_h = (ElfW(Ehdr) *) old_base; + 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. - */ - - 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) - { - old_bss_addr = OLD_SECTION_H (old_bss_index).sh_addr; - old_bss_size = OLD_SECTION_H (old_bss_index).sh_size; - 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; - new_data2_index = old_sbss_index; - } + old_section_names = (const char *) old_base + + OLD_SECTION_H (old_file_h->e_shstrndx).sh_offset; + + /* Find a section which we will grow by looking for the SHT_NOBITS + * section with ALLOCATE flag and with the biggest address. */ + for (n = 1; n < old_file_h->e_shnum; n++) { + ElfW(Shdr) * sh = & OLD_SECTION_H(n); + + if ((sh->sh_type == SHT_NOBITS) && (sh->sh_flags & SHF_ALLOC)) { + if ( old_bss_addr < sh->sh_addr ) { + growme = sh; + growme_index = n; + new_data2_addr = old_bss_addr = sh->sh_addr; + } + } + } - /* Find the old .data section. Figure out parameters of - the new data2 and bss sections. */ + if (growme == NULL ) + fatal ("Can't find a section to grow\n", 0, 0); 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_data_index).sh_offset + - (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr); - -#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, "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); -#endif - - if ((unsigned) new_bss_addr < (unsigned) old_bss_addr + old_bss_size) - fatal (".bss shrank when undumping???\n", 0, 0); + (new_data2_addr - OLD_SECTION_H (old_data_index).sh_addr); - /* Set the output file to the right size and mmap it. Set - * pointers to various interesting objects. stat_buf still has - * old_file data. - */ + if ( new_bss_addr < old_bss_addr + growme->sh_size ) + fatal (".bss shrank when undumping???\n", 0, 0); - 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); + /* Set the output file to the right size and mmap it. */ + if ( (new_file = open (new_name, O_RDWR | O_CREAT, 0666)) < 0 ) + fatal ("Can't create (%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_size; if (ftruncate (new_file, new_file_size)) - fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno); + fatal ("Can't ftruncate (%s): errno %d\n", new_name, errno); -#ifdef UNEXEC_USE_MAP_PRIVATE new_base = (caddr_t) mmap ((caddr_t) 0, new_file_size, PROT_READ | PROT_WRITE, - MAP_PRIVATE, new_file, 0); +#ifdef UNEXEC_USE_MAP_PRIVATE + MAP_PRIVATE, #else - new_base = (caddr_t) mmap ((caddr_t) 0, new_file_size, - PROT_READ | PROT_WRITE, - MAP_SHARED, new_file, 0); + MAP_SHARED, #endif + new_file, 0); if (new_base == (caddr_t) -1) - fatal ("Can't mmap (%s): errno %d\n", new_name, errno); + fatal ("Can't mmap (%s): errno %d\n", new_name, errno); 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_size); + new_section_h = (ElfW(Shdr) *) ((byte *) new_base + old_file_h->e_shoff + + new_data2_size); /* Make our new file, program and section headers as copies of the - * originals. - */ - + * originals. */ memcpy (new_file_h, old_file_h, old_file_h->e_ehsize); memcpy (new_program_h, old_program_h, old_file_h->e_phnum * old_file_h->e_phentsize); @@ -812,245 +301,148 @@ unexec (char *new_name, PATCH_INDEX (new_file_h->e_shstrndx); /* Fix up file header. We'll add one section. Section header is - * further away now. - */ - + * further away now. */ new_file_h->e_shoff += new_data2_size; new_file_h->e_shnum += 1; + /* Fix up a new program header by extending the writable data + * segment so that the bss area is covered too. Find that segment by + * looking for one that starts before and ends after the .bss and is + * PT_LOADable. */ + for (n = new_file_h->e_phnum - 1; n >= 0; n--) { + ElfW(Phdr) * ph = & NEW_PROGRAM_H(n); #ifdef DEBUG - fprintf (stderr, "Old section offset %x\n", old_file_h->e_shoff); - fprintf (stderr, "Old section count %d\n", old_file_h->e_shnum); - fprintf (stderr, "New section offset %x\n", new_file_h->e_shoff); - fprintf (stderr, "New section count %d\n", new_file_h->e_shnum); + printf ("%d @ %0x + %0x against %0x + %0x", + n, ph->p_vaddr, ph->p_memsz,growme->sh_addr, growme->sh_size); #endif + if ((ph->p_type == PT_LOAD) && + (ph->p_vaddr <= growme->sh_addr) && + ((ph->p_vaddr+ph->p_memsz) >= (growme->sh_addr + growme->sh_size))) { + /* Make sure that the size includes any padding before the + * old .bss section. */ + ph->p_memsz = ph->p_filesz = new_bss_addr - ph->p_vaddr; +#ifdef DEBUG + puts (" That's the one!"); +#endif + break; + } +#ifdef DEBUG + putchar ('\n'); +#endif + } - /* Fix up a new program header. Extend the writable data segment so - * that the bss area is covered too. Find that segment by looking - * for a segment that ends just before the .bss area. Make sure - * that no segments are above the new .data2. Put a loop at the end - * to adjust the offset and address of any segment that is above - * data2, just in case we decide to allow this later. - */ - - for (n = new_file_h->e_phnum - 1; n >= 0; n--) - { - /* Compute maximum of all requirements for alignment of section. */ - 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; - -#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 - + (NEW_PROGRAM_H (n)).p_filesz, - alignment) - == round_up (old_bss_addr, alignment))) - break; - } if (n < 0) - fatal ("Couldn't find segment next to .bss in %s\n", old_name, 0); + fatal ("Couldn't find segment which covers %s", + old_section_names + growme->sh_name); + + /* 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++) { + ElfW(Shdr) * nsec = & NEW_SECTION_H(nn); + ElfW(Shdr) * osec = & OLD_SECTION_H(n); + + /* If this is the section we want to grow, insert the new data + * section before it. */ + if ( osec == growme ) { + /* Steal the data section header for this data2 section but + * use the * 'grow' section's alignment. This * will assure + * that the new section * always be placed in the same spot + * * as the old section by any other * application. */ + ElfW(Shdr) * od = &OLD_SECTION_H(old_data_index); + + memcpy (nsec, od, new_file_h->e_shentsize); + + nsec->sh_addr = new_data2_addr; + nsec->sh_offset = new_data2_offset; + nsec->sh_size = new_data2_size; + nsec->sh_addralign = osec->sh_addralign; + + /* Copy over what we have in memory now. */ + memcpy (nsec->sh_offset + new_base, (caddr_t) osec->sh_addr, + new_data2_size); + nn++; + grown = nsec++; + } - /* 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; + memcpy (nsec, osec, old_file_h->e_shentsize); + + if ( osec == growme ) { + /* The new bss section's size is zero, and its file offset + * and virtual address should be off by NEW_DATA2_SIZE. */ + nsec->sh_offset = grown->sh_offset + new_data2_size; + nsec->sh_addr = grown->sh_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 this section will be placed in exactly the + * same place. */ + nsec->sh_addralign = osec->sh_addralign; + nsec->sh_size = 0; + } else { + /* Any section that was originally placed AFTER the bss + * section should now be off by NEW_DATA2_SIZE. */ + if ( round_up (nsec->sh_offset, growme->sh_addralign) >= + new_data2_offset) + nsec->sh_offset += new_data2_size; + } -#if 0 /* Maybe allow section after data2 - does this ever happen? */ - for (n = new_file_h->e_phnum - 1; n >= 0; n--) - { - if (NEW_PROGRAM_H (n).p_vaddr - && NEW_PROGRAM_H (n).p_vaddr >= new_data2_addr) - NEW_PROGRAM_H (n).p_vaddr += new_data2_size - old_bss_size; + /* 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 (nsec->sh_offset > new_file_h->e_shoff) + nsec->sh_offset += new_file_h->e_shentsize; - if (NEW_PROGRAM_H (n).p_offset >= new_data2_offset) - NEW_PROGRAM_H (n).p_offset += new_data2_size; - } -#endif - - /* Fix up section headers based on new .data2 section. Any section - * whose offset or virtual address is after the new .data2 section - * gets its value adjusted. .bss size becomes zero and new address - * is set. data2 section header gets added by copying the existing - * .data header and modifying the offset, address and size. - */ - for (old_data_index = 1; old_data_index < (int) old_file_h->e_shnum; - old_data_index++) - if (!strcmp (old_section_names + OLD_SECTION_H (old_data_index).sh_name, - ".data")) - break; - 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 - 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 (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; - /* Use the bss section's alignment. This will assure that the - new data2 section always be placed in the same spot as the old - bss section by any other application. */ - 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, - new_data2_size); - nn++; - } - - memcpy (&NEW_SECTION_H (nn), &OLD_SECTION_H (n), - old_file_h->e_shentsize); - - 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_s?bss_index + 1' at this point. */ - NEW_SECTION_H (nn).sh_offset = - NEW_SECTION_H (new_data2_index).sh_offset + new_data2_size; - NEW_SECTION_H (nn).sh_addr = - NEW_SECTION_H (new_data2_index).sh_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 - 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; - } - else - { - /* Any section that was original placed AFTER the bss - section should now be off by NEW_DATA2_SIZE. */ -#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_size; -#else - if (round_up (NEW_SECTION_H (nn).sh_offset, - OLD_SECTION_H (old_bss_index).sh_addralign) - >= new_data2_offset) - NEW_SECTION_H (nn).sh_offset += new_data2_size; -#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 - 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; + * section, make it refer to next one because we have inserted a + * new section in between. */ + PATCH_INDEX (nsec->sh_link); + + /* For symbol tables, info is a symbol table index, so don't + * change it. */ + if (nsec->sh_type != SHT_SYMTAB && nsec->sh_type != SHT_DYNSYM) + PATCH_INDEX (nsec->sh_info); + + /* Any section which used to be NOBITS will now becomes PROGBITS + * if it's ALLOC-atable, unless, of cause, it's not the one we + * decided to grow */ + if ( (osec->sh_type == SHT_NOBITS) && (osec->sh_flags & SHF_ALLOC) && + (osec != growme ) ) { + nsec->sh_type = SHT_PROGBITS; + } + + /* Now, start to copy the content of sections */ + if ( nsec->sh_type != SHT_NULL || nsec->sh_type != SHT_NOBITS ) { + + /* 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. */ + caddr_t src = old_base + osec->sh_offset; + const char * secname = old_section_names + nsec->sh_name; + const char * names[] = { + ".data",".sdata", ".lit4", ".lit8", ".sdata1", ".data1", + ".sbss", NULL}; + int i; + + for ( i=0; names[i] != NULL; i++ ) { + if ( ! strcmp (secname, names[i]) ) { + src = (caddr_t) osec->sh_addr; + break; + } } - /* 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") - || !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") - || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), - ".sdata1") - || !strcmp ((old_section_names + NEW_SECTION_H (n).sh_name), - ".data1") - || !strcmp (old_section_names + NEW_SECTION_H (nn).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); + memcpy (nsec->sh_offset + new_base, src, nsec->sh_size); + } -#ifdef __alpha__ - /* 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__ */ + old_mdebug_index = find_section (".mdebug", old_section_names, + old_name, old_file_h, old_section_h, 1); #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) - { + if (nsec->sh_type == SHT_MIPS_DEBUG && old_mdebug_index != -1) { + int diff = nsec->sh_offset-OLD_SECTION_H(old_mdebug_index).sh_offset; + HDRR *phdr = (HDRR *)(nsec->sh_offset + new_base); + + if (diff) { phdr->cbLineOffset += diff; phdr->cbDnOffset += diff; phdr->cbPdOffset += diff; @@ -1062,29 +454,29 @@ unexec (char *new_name, 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) - { + /* 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 */ #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); + if (n == old_mdebug_index) { + HDRR * o_phdrr = (HDRR *)((byte *)old_base + osec->sh_offset); + HDRR * n_phdrr = (HDRR *)((byte *)new_base + nsec->sh_offset); unsigned movement = new_data2_size; MDEBUGADJUST (idnMax, cbDnOffset); @@ -1097,142 +489,112 @@ unexec (char *new_name, 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. - */ + + /* The Line Section, being possible off in a hole of the + * object, requires special handling. */ + if (n_phdrr->cbLine > 0) { + if (o_phdrr->cbLineOffset > + osec->sh_offset+ osec->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. */ + } 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) - { - ElfW(Shdr) *spt = &NEW_SECTION_H (nn); - unsigned int num = spt->sh_size / spt->sh_entsize; - ElfW(Sym) * sym = (ElfW(Sym) *) (NEW_SECTION_H (nn).sh_offset + - new_base); - for (; num--; sym++) - { - if ((sym->st_shndx == SHN_UNDEF) - || (sym->st_shndx == SHN_ABS) - || (sym->st_shndx == SHN_COMMON)) - continue; + /* If it is the symbol table, its st_shndx field needs to be + * patched. */ + if (nsec->sh_type == SHT_SYMTAB || nsec->sh_type == SHT_DYNSYM) { + unsigned int num = nsec->sh_size / nsec->sh_entsize; + ElfW(Sym) * sym = (ElfW(Sym) *)(nsec->sh_offset + new_base); + byte *symnames = ((byte *) new_base + + NEW_SECTION_H (nsec->sh_link).sh_offset); + + for (; num--; sym++) { + const char * symnam = (char *) (symnames + sym->st_name); + + /* Update the symbol values of _edata and _end. */ + if (strcmp (symnam, "_end") == 0 + || strcmp (symnam, "end") == 0 + || strcmp (symnam, "_edata") == 0 + || strcmp (symnam, "edata") == 0) + memcpy (&sym->st_value, &new_bss_addr,sizeof (new_bss_addr)); + + + if ((sym->st_shndx == SHN_UNDEF) || (sym->st_shndx == SHN_ABS) + || (sym->st_shndx == SHN_COMMON) + || (sym->st_shndx >= SHN_LOPROC && + sym->st_shndx <= SHN_HIPROC)) + continue; PATCH_INDEX (sym->st_shndx); - } - } - } - - /* Update the symbol values of _edata and _end. */ - for (n = new_file_h->e_shnum - 1; n; n--) - { - byte *symnames; - ElfW(Sym) *symp, *symendp; - - if (NEW_SECTION_H (n).sh_type != SHT_DYNSYM - && NEW_SECTION_H (n).sh_type != SHT_SYMTAB) - continue; - - 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), "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)); - } + } + } + } /* 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--) - { + * 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") - || !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; + + if ( section.sh_type == SHT_REL || section.sh_type == 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. */ + ElfW(Shdr) * info = & NEW_SECTION_H(section.sh_info); + const char * nm = old_section_names + info->sh_name; + + if (!strcmp (nm, ".data") || !strcmp (nm, ".sdata") + || !strcmp (nm, ".lit4") || !strcmp (nm, ".lit8") + || !strcmp (nm, ".sdata1") || !strcmp (nm, ".data1")) { + ElfW(Addr) offset = info->sh_addr - info->sh_offset; + caddr_t end, reloc = old_base + section.sh_offset; + + 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; + /* 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))); + memcpy (new_base + addr, old_base + addr, + sizeof(ElfW(Addr))); } } - break; } - } + } #ifdef UNEXEC_USE_MAP_PRIVATE if (lseek (new_file, 0, SEEK_SET) == -1) - fatal ("Can't rewind (%s): errno %d\n", new_name, errno); + fatal ("Can't rewind (%s): errno %d\n", new_name, errno); if (write (new_file, new_base, new_file_size) != new_file_size) - fatal ("Can't write (%s): errno %d\n", new_name, errno); + fatal ("Can't write (%s): errno %d\n", new_name, errno); #endif /* Close the files and make the new file executable. */ - if (close (old_file)) - fatal ("Can't close (%s): errno %d\n", old_name, errno); + fatal ("Can't close (%s): errno %d\n", old_name, errno); if (close (new_file)) - fatal ("Can't close (%s): errno %d\n", new_name, errno); + fatal ("Can't close (%s): errno %d\n", new_name, errno); if (stat (new_name, &stat_buf) == -1) - fatal ("Can't stat (%s): errno %d\n", new_name, errno); + fatal ("Can't stat (%s): errno %d\n", new_name, errno); n = umask (777); umask (n); stat_buf.st_mode |= 0111 & ~n; if (chmod (new_name, stat_buf.st_mode) == -1) - fatal ("Can't chmod (%s): errno %d\n", new_name, errno); + fatal ("Can't chmod (%s): errno %d\n", new_name, errno); }