diff options
Diffstat (limited to 'mdk-stage1/insmod-modutils/obj/obj_kallsyms.c')
| -rw-r--r-- | mdk-stage1/insmod-modutils/obj/obj_kallsyms.c | 292 |
1 files changed, 0 insertions, 292 deletions
diff --git a/mdk-stage1/insmod-modutils/obj/obj_kallsyms.c b/mdk-stage1/insmod-modutils/obj/obj_kallsyms.c deleted file mode 100644 index 8385fb892..000000000 --- a/mdk-stage1/insmod-modutils/obj/obj_kallsyms.c +++ /dev/null @@ -1,292 +0,0 @@ -/* Build a section containing all non-stack symbols. - Copyright 2000 Keith Owens <kaos@ocs.com.au> - - This file is part of the Linux modutils. - - 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 of the License, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ - -#ident "$Id$" - -#include <stdlib.h> -#include <string.h> -#include <malloc.h> - -#include "obj.h" -#include "kallsyms.h" -#include "util.h" - -/*======================================================================*/ - -#define EXPAND_BY 4096 /* Arbitrary */ - -/* Append a string to the big list of strings */ - -static void -append_string (const char *s, char **strings, - ElfW(Word) *strings_size, ElfW(Word) *strings_left) -{ - int l = strlen(s) + 1; - while (l > *strings_left) { - *strings = xrealloc(*strings, *strings_size += EXPAND_BY); - *strings_left += EXPAND_BY; - } - memcpy((char *)*strings+*strings_size-*strings_left, s, l); - *strings_left -= l; -} - - -/* Append a symbol to the big list of symbols */ - -static void -append_symbol (const struct kallsyms_symbol *s, - struct kallsyms_symbol **symbols, - ElfW(Word) *symbols_size, ElfW(Word) *symbols_left) -{ - int l = sizeof(*s); - while (l > *symbols_left) { - *symbols = xrealloc(*symbols, *symbols_size += EXPAND_BY); - *symbols_left += EXPAND_BY; - } - memcpy((char *)*symbols+*symbols_size-*symbols_left, s, l); - *symbols_left -= l; -} - -/* qsort compare routine to sort symbols */ - -static const char *sym_strings; - -static int -symbol_compare (const void *a, const void *b) -{ - struct kallsyms_symbol *c = (struct kallsyms_symbol *) a; - struct kallsyms_symbol *d = (struct kallsyms_symbol *) b; - - if (c->symbol_addr > d->symbol_addr) - return(1); - if (c->symbol_addr < d->symbol_addr) - return(-1); - return(strcmp(sym_strings+c->name_off, sym_strings+d->name_off)); -} - - -/* Extract all symbols from the input obj_file, ignore ones that are - * no use for debugging, build an output obj_file containing only the - * kallsyms section. - * - * The kallsyms section is a bit unusual. It deliberately has no - * relocatable data, all "pointers" are represented as byte offsets - * into the the section. This means it can be stored anywhere without - * relocation problems. In particular it can be stored within a kernel - * image, it can be stored separately from the kernel image, it can be - * appended to a module just before loading, it can be stored in a - * separate area etc. - * - * Format of the kallsyms section. - * - * Header: - * Size of header. - * Total size of kallsyms data, including strings. - * Number of loaded sections. - * Offset to first section entry from start of header. - * Size of each section entry, excluding the name string. - * Number of symbols. - * Offset to first symbol entry from start of header. - * Size of each symbol entry, excluding the name string. - * - * Section entry - one per loaded section. - * Start of section[1]. - * Size of section. - * Offset to name of section, from start of strings. - * Section flags. - * - * Symbol entry - one per symbol in the input file[2]. - * Offset of section that owns this symbol, from start of section data. - * Address of symbol within the real section[1]. - * Offset to name of symbol, from start of strings. - * - * Notes: [1] This is an exception to the "represent pointers as - * offsets" rule, it is a value, not an offset. The start - * address of a section or a symbol is extracted from the - * obj_file data which may contain absolute or relocatable - * addresses. If the addresses are relocatable then the - * caller must adjust the section and/or symbol entries in - * kallsyms after relocation. - * [2] Only symbols that fall within loaded sections are stored. - */ - -int -obj_kallsyms (struct obj_file *fin, struct obj_file **fout_result) -{ - struct obj_file *fout; - int i, loaded = 0, *fin_to_allsym_map; - struct obj_section *isec, *osec; - struct kallsyms_header *a_hdr; - struct kallsyms_section *a_sec; - ElfW(Off) sec_off; - struct kallsyms_symbol *symbols = NULL, a_sym; - ElfW(Word) symbols_size = 0, symbols_left = 0; - char *strings = NULL, *p; - ElfW(Word) strings_size = 0, strings_left = 0; - ElfW(Off) file_offset; - static char strtab[] = "\000" KALLSYMS_SEC_NAME; - - /* Create the kallsyms section. */ - fout = arch_new_file(); - memset(fout, 0, sizeof(*fout)); - fout->symbol_cmp = strcmp; - fout->symbol_hash = obj_elf_hash; - fout->load_order_search_start = &fout->load_order; - - /* Copy file characteristics from input file and modify to suit */ - memcpy(&fout->header, &fin->header, sizeof(fout->header)); - fout->header.e_type = ET_REL; /* Output is relocatable */ - fout->header.e_entry = 0; /* No entry point */ - fout->header.e_phoff = 0; /* No program header */ - file_offset = sizeof(fout->header); /* Step over Elf header */ - fout->header.e_shoff = file_offset; /* Section headers next */ - fout->header.e_phentsize = 0; /* No program header */ - fout->header.e_phnum = 0; /* No program header */ - fout->header.e_shnum = KALLSYMS_IDX+1; /* Initial, strtab, kallsyms */ - fout->header.e_shstrndx = KALLSYMS_IDX-1; /* strtab */ - file_offset += fout->header.e_shentsize * fout->header.e_shnum; - - /* Populate the section data for kallsyms itself */ - fout->sections = xmalloc(sizeof(*(fout->sections))*fout->header.e_shnum); - memset(fout->sections, 0, sizeof(*(fout->sections))*fout->header.e_shnum); - - fout->sections[0] = osec = arch_new_section(); - memset(osec, 0, sizeof(*osec)); - osec->header.sh_type = SHT_NULL; - osec->header.sh_link = SHN_UNDEF; - - fout->sections[KALLSYMS_IDX-1] = osec = arch_new_section(); - memset(osec, 0, sizeof(*osec)); - osec->name = ".strtab"; - osec->header.sh_type = SHT_STRTAB; - osec->header.sh_link = SHN_UNDEF; - osec->header.sh_offset = file_offset; - osec->header.sh_size = sizeof(strtab); - osec->contents = xmalloc(sizeof(strtab)); - memcpy(osec->contents, strtab, sizeof(strtab)); - file_offset += osec->header.sh_size; - - fout->sections[KALLSYMS_IDX] = osec = arch_new_section(); - memset(osec, 0, sizeof(*osec)); - osec->name = KALLSYMS_SEC_NAME; - osec->header.sh_name = 1; /* Offset in strtab */ - osec->header.sh_type = SHT_PROGBITS; /* Load it */ - osec->header.sh_flags = SHF_ALLOC; /* Read only data */ - osec->header.sh_link = SHN_UNDEF; - osec->header.sh_addralign = sizeof(ElfW(Word)); - file_offset = (file_offset + osec->header.sh_addralign - 1) - & -(osec->header.sh_addralign); - osec->header.sh_offset = file_offset; - - /* How many loaded sections are there? */ - for (i = 0; i < fin->header.e_shnum; ++i) { - if (fin->sections[i]->header.sh_flags & SHF_ALLOC) - ++loaded; - } - - /* Initial contents, header + one entry per input section. No strings. */ - osec->header.sh_size = sizeof(*a_hdr) + loaded*sizeof(*a_sec); - a_hdr = (struct kallsyms_header *) osec->contents = - xmalloc(osec->header.sh_size); - memset(osec->contents, 0, osec->header.sh_size); - a_hdr->size = sizeof(*a_hdr); - a_hdr->sections = loaded; - a_hdr->section_off = a_hdr->size; - a_hdr->section_size = sizeof(*a_sec); - a_hdr->symbol_off = osec->header.sh_size; - a_hdr->symbol_size = sizeof(a_sym); - a_hdr->start = (ElfW(Addr))(~0); - - /* Map input section numbers to kallsyms section offsets. */ - sec_off = 0; /* Offset to first kallsyms section entry */ - fin_to_allsym_map = xmalloc(sizeof(*fin_to_allsym_map)*fin->header.e_shnum); - for (i = 0; i < fin->header.e_shnum; ++i) { - isec = fin->sections[i]; - if (isec->header.sh_flags & SHF_ALLOC) { - fin_to_allsym_map[isec->idx] = sec_off; - sec_off += a_hdr->section_size; - } - else - fin_to_allsym_map[isec->idx] = -1; /* Ignore this section */ - } - - /* Copy the loaded section data. */ - a_sec = (struct kallsyms_section *) ((char *) a_hdr + a_hdr->section_off); - for (i = 0; i < fin->header.e_shnum; ++i) { - isec = fin->sections[i]; - if (!(isec->header.sh_flags & SHF_ALLOC)) - continue; - a_sec->start = isec->header.sh_addr; - a_sec->size = isec->header.sh_size; - a_sec->flags = isec->header.sh_flags; - a_sec->name_off = strings_size - strings_left; - append_string(isec->name, &strings, &strings_size, &strings_left); - if (a_sec->start < a_hdr->start) - a_hdr->start = a_sec->start; - if (a_sec->start+a_sec->size > a_hdr->end) - a_hdr->end = a_sec->start+a_sec->size; - ++a_sec; - } - - /* Build the kallsyms symbol table from the symbol hashes. */ - for (i = 0; i < HASH_BUCKETS; ++i) { - struct obj_symbol *sym = fin->symtab[i]; - for (sym = fin->symtab[i]; sym ; sym = sym->next) { - if (!sym || sym->secidx >= fin->header.e_shnum) - continue; - if ((a_sym.section_off = fin_to_allsym_map[sym->secidx]) == -1) - continue; - if (strcmp(sym->name, "gcc2_compiled.") == 0 || - strncmp(sym->name, "__insmod_", 9) == 0) - continue; - a_sym.symbol_addr = sym->value; - if (fin->header.e_type == ET_REL) - a_sym.symbol_addr += fin->sections[sym->secidx]->header.sh_addr; - a_sym.name_off = strings_size - strings_left; - append_symbol(&a_sym, &symbols, &symbols_size, &symbols_left); - append_string(sym->name, &strings, &strings_size, &strings_left); - ++a_hdr->symbols; - } - } - free(fin_to_allsym_map); - - /* Sort the symbols into ascending order by address and name */ - sym_strings = strings; /* For symbol_compare */ - qsort((char *) symbols, (unsigned) a_hdr->symbols, - sizeof(* symbols), symbol_compare); - sym_strings = NULL; - - /* Put the lot together */ - osec->header.sh_size = a_hdr->total_size = - a_hdr->symbol_off + - a_hdr->symbols*a_hdr->symbol_size + - strings_size - strings_left; - a_hdr = (struct kallsyms_header *) osec->contents = - xrealloc(a_hdr, a_hdr->total_size); - p = (char *)a_hdr + a_hdr->symbol_off; - memcpy(p, symbols, a_hdr->symbols*a_hdr->symbol_size); - free(symbols); - p += a_hdr->symbols*a_hdr->symbol_size; - a_hdr->string_off = p - (char *)a_hdr; - memcpy(p, strings, strings_size - strings_left); - free(strings); - - *fout_result = fout; - return 0; -} |