326 lines
6.9 KiB
C
326 lines
6.9 KiB
C
/*
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* Copyright © 2013 Keith Packard <keithp@keithp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#include <err.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "ao-elf.h"
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#include "ao-hex.h"
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#include "ao-verbose.h"
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/*
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* Look through the Elf file for symbols that can be adjusted before
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* the image is written to the device
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*/
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static struct ao_sym *
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load_symbols (Elf *e, int *num_symbolsp)
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{
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Elf_Scn *scn;
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Elf_Data *symbol_data = NULL;
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GElf_Shdr shdr;
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GElf_Sym sym;
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int i, symbol_count;
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char *symbol_name;
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size_t shstrndx;
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struct ao_sym *symbols = NULL;
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struct ao_sym *symbol;
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int num_symbols = 0;
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int size_symbols = 0;
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if (elf_getshdrstrndx(e, &shstrndx) < 0)
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return false;
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/*
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* Find the symbols
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*/
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scn = NULL;
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while ((scn = elf_nextscn(e, scn)) != NULL) {
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if (gelf_getshdr(scn, &shdr) != &shdr)
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return false;
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if (shdr.sh_type == SHT_SYMTAB) {
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symbol_data = elf_getdata(scn, NULL);
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symbol_count = shdr.sh_size / shdr.sh_entsize;
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break;
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}
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}
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if (!symbol_data)
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return NULL;
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for (i = 0; i < symbol_count; i++) {
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gelf_getsym(symbol_data, i, &sym);
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symbol_name = elf_strptr(e, shdr.sh_link, sym.st_name);
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if (!symbol_name[0])
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continue;
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if (num_symbols == size_symbols) {
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struct ao_sym *new_symbols;
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int new_size;
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if (!size_symbols)
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new_size = 16;
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else
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new_size = size_symbols * 2;
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new_symbols = realloc(symbols, new_size * sizeof (struct ao_sym));
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if (!new_symbols)
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goto bail;
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symbols = new_symbols;
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size_symbols = new_size;
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}
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symbol = &symbols[num_symbols];
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memset(symbol, 0, sizeof (struct ao_sym));
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symbol->name = strdup(symbol_name);
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if (!symbol->name)
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goto bail;
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symbol->addr = sym.st_value;
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ao_printf(AO_VERBOSE_EXE, "Add symbol %s: %08x\n", symbol->name, symbol->addr);
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num_symbols++;
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}
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*num_symbolsp = num_symbols;
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return symbols;
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bail:
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for (i = 0; i < num_symbols; i++)
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free(symbols[i].name);
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free(symbols);
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return NULL;
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}
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static uint32_t
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round4(uint32_t a) {
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return (a + 3) & ~3;
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}
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static struct ao_hex_image *
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new_load (uint32_t addr, uint32_t len)
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{
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struct ao_hex_image *new;
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len = round4(len);
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new = calloc (1, sizeof (struct ao_hex_image) + len);
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if (!new)
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abort();
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new->address = addr;
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new->length = len;
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return new;
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}
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static void
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load_paste(struct ao_hex_image *into, struct ao_hex_image *from)
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{
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if (from->address < into->address || into->address + into->length < from->address + from->length)
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abort();
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memcpy(into->data + from->address - into->address, from->data, from->length);
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}
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/*
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* Make a new load structure large enough to hold the old one and
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* the new data
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*/
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static struct ao_hex_image *
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expand_load(struct ao_hex_image *from, uint32_t address, uint32_t length)
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{
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struct ao_hex_image *new;
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if (from) {
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uint32_t from_last = from->address + from->length;
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uint32_t last = address + length;
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if (address > from->address)
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address = from->address;
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if (last < from_last)
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last = from_last;
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length = last - address;
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if (address == from->address && length == from->length)
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return from;
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}
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new = new_load(address, length);
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if (from) {
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load_paste(new, from);
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free (from);
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}
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return new;
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}
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/*
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* Create a new load structure with data from the existing one
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* and the new data
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*/
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static struct ao_hex_image *
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load_write(struct ao_hex_image *from, uint32_t address, uint32_t length, void *data)
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{
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struct ao_hex_image *new;
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new = expand_load(from, address, length);
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memcpy(new->data + address - new->address, data, length);
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return new;
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}
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#define DBG 0
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/*
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* Construct a large in-memory block for all
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* of the loaded sections of the program
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*/
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static struct ao_hex_image *
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get_load(Elf *e)
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{
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Elf_Scn *scn;
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size_t shstrndx;
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GElf_Shdr shdr;
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Elf_Data *data;
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size_t nphdr;
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size_t p;
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GElf_Phdr phdr;
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GElf_Addr sh_paddr;
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struct ao_hex_image *load = NULL;
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#if DBG
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char *section_name;
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#endif
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size_t nshdr;
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size_t s;
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if (elf_getshdrstrndx(e, &shstrndx) < 0)
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return 0;
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if (elf_getphdrnum(e, &nphdr) < 0)
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return 0;
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if (elf_getshdrnum(e, &nshdr) < 0)
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return 0;
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/*
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* As far as I can tell, all of the phdr sections should
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* be flashed to memory
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*/
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for (p = 0; p < nphdr; p++) {
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/* Find this phdr */
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gelf_getphdr(e, p, &phdr);
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if (phdr.p_type != PT_LOAD)
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continue;
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/* Get the associated file section */
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#if DBG
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fprintf (stderr, "offset %08x vaddr %08x paddr %08x filesz %08x memsz %08x\n",
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(uint32_t) phdr.p_offset,
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(uint32_t) phdr.p_vaddr,
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(uint32_t) phdr.p_paddr,
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(uint32_t) phdr.p_filesz,
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(uint32_t) phdr.p_memsz);
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#endif
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for (s = 0; s < nshdr; s++) {
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scn = elf_getscn(e, s);
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if (!scn) {
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fprintf (stderr, "getscn failed\n");
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abort();
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}
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if (gelf_getshdr(scn, &shdr) != &shdr) {
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fprintf (stderr, "gelf_getshdr failed\n");
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abort();
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}
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#if DBG
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section_name = elf_strptr(e, shstrndx, shdr.sh_name);
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#endif
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if (shdr.sh_size != 0 && shdr.sh_type != SHT_NOBITS && (shdr.sh_flags & SHF_ALLOC) &&
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phdr.p_offset <= shdr.sh_offset && shdr.sh_offset < phdr.p_offset + phdr.p_filesz)
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{
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sh_paddr = phdr.p_paddr + shdr.sh_offset - phdr.p_offset;
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#if DBG
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fprintf (stderr, "\tsize %08x rom %08x exec %08x %s\n",
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(uint32_t) shdr.sh_size,
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(uint32_t) sh_paddr,
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(uint32_t) shdr.sh_addr,
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section_name);
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#endif
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data = elf_getdata(scn, NULL);
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/* Write the section data into the memory block */
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load = load_write(load, sh_paddr, shdr.sh_size, data->d_buf);
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}
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}
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}
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return load;
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}
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/*
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* Open the specified ELF file and
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* check for the symbols we need
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*/
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struct ao_hex_image *
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ao_load_elf(char *name, struct ao_sym **symbols, int *num_symbols)
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{
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int fd;
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Elf *e;
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size_t shstrndx;
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struct ao_hex_image *image;
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if (elf_version(EV_CURRENT) == EV_NONE)
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return NULL;
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fd = open(name, O_RDONLY, 0);
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if (fd < 0)
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return NULL;
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e = elf_begin(fd, ELF_C_READ, NULL);
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if (!e)
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return NULL;
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if (elf_kind(e) != ELF_K_ELF)
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return NULL;
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if (elf_getshdrstrndx(e, &shstrndx) != 0)
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return NULL;
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if (symbols)
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*symbols = load_symbols(e, num_symbols);
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image = get_load(e);
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if (!image) {
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fprintf (stderr, "Cannot create memory image from file\n");
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return NULL;
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}
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return image;
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}
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