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u-boot/tools/relocate-rela.c
Ovidiu Panait 02d30e5f92 tools: relocate-rela: add support for handling 32-bit big endian files 
Currently, a microblaze build with CONFIG_SYS_BIG_ENDIAN=y and
CONFIG_STATIC_RELA=y fails with:
tools/relocate-rela: Not supported machine type
ELF decoding failed
make[2]: *** [u-boot/Makefile:1306: u-boot-nodtb.bin] Error 1

To fix this, convert the 32-bit codepath to use the previously added
elf{16,32}_to_cpu() functions. The aarch64 codepath is left untouched.

This commit ensures that CI doesn't fail for the next patches which enable
runtime relocation by default for microblaze.

Reviewed-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Ovidiu Panait <ovpanait@gmail.com>
Link: https://lore.kernel.org/r/20230311173838.521804-3-ovpanait@gmail.com
Signed-off-by: Michal Simek <michal.simek@amd.com>
2023-03-13 11:46:17 +01:00

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// SPDX-License-Identifier: GPL-2.0+ OR BSD-2-Clause
/*
* Copyright 2013 Freescale Semiconductor, Inc.
*
* 64-bit and little-endian target only until we need to support a different
* arch that needs this.
*/
#include <elf.h>
#include <errno.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "compiler.h"
#ifndef EM_AARCH64
#define EM_AARCH64 183
#endif
#ifndef R_AARCH64_RELATIVE
#define R_AARCH64_RELATIVE 1027
#endif
#ifndef EM_MICROBLAZE
#define EM_MICROBLAZE 189
#endif
#ifndef R_MICROBLAZE_NONE
#define R_MICROBLAZE_NONE 0
#endif
#ifndef R_MICROBLAZE_32
#define R_MICROBLAZE_32 1
#endif
#ifndef R_MICROBLAZE_REL
#define R_MICROBLAZE_REL 16
#endif
#ifndef R_MICROBLAZE_GLOB_DAT
#define R_MICROBLAZE_GLOB_DAT 18
#endif
static int ei_class;
static int ei_data;
static uint64_t rela_start, rela_end, text_base, dyn_start;
static const bool debug_en;
static void debug(const char *fmt, ...)
{
va_list args;
if (debug_en) {
va_start(args, fmt);
vprintf(fmt, args);
va_end(args);
}
}
static uint16_t elf16_to_cpu(uint16_t data)
{
if (ei_data == ELFDATA2LSB)
return le16_to_cpu(data);
return be16_to_cpu(data);
}
static uint32_t elf32_to_cpu(uint32_t data)
{
if (ei_data == ELFDATA2LSB)
return le32_to_cpu(data);
return be32_to_cpu(data);
}
static bool supported_rela(Elf64_Rela *rela)
{
uint64_t mask = 0xffffffffULL; /* would be different on 32-bit */
uint32_t type = rela->r_info & mask;
switch (type) {
case R_AARCH64_RELATIVE:
return true;
default:
fprintf(stderr, "warning: unsupported relocation type %"
PRIu32 " at %" PRIx64 "\n",
type, rela->r_offset);
return false;
}
}
static int decode_elf64(FILE *felf, char **argv)
{
size_t size;
Elf64_Ehdr header;
uint64_t section_header_base, section_header_size;
uint64_t sh_addr, sh_offset, sh_size;
Elf64_Half sh_index, sh_num;
Elf64_Shdr *sh_table; /* Elf symbol table */
int ret, i, machine;
char *sh_str;
debug("64bit version\n");
/* Make sure we are at start */
rewind(felf);
size = fread(&header, 1, sizeof(header), felf);
if (size != sizeof(header)) {
fclose(felf);
return 25;
}
machine = le16_to_cpu(header.e_machine);
debug("Machine\t%d\n", machine);
if (machine != EM_AARCH64) {
fprintf(stderr, "%s: Not supported machine type\n", argv[0]);
return 30;
}
text_base = le64_to_cpu(header.e_entry);
section_header_base = le64_to_cpu(header.e_shoff);
section_header_size = le16_to_cpu(header.e_shentsize) *
le16_to_cpu(header.e_shnum);
sh_table = malloc(section_header_size);
if (!sh_table) {
fprintf(stderr, "%s: Cannot allocate space for section header\n",
argv[0]);
fclose(felf);
return 26;
}
ret = fseek(felf, section_header_base, SEEK_SET);
if (ret) {
fprintf(stderr, "%s: Can't set pointer to section header: %x/%lx\n",
argv[0], ret, section_header_base);
free(sh_table);
fclose(felf);
return 26;
}
size = fread(sh_table, 1, section_header_size, felf);
if (size != section_header_size) {
fprintf(stderr, "%s: Can't read section header: %lx/%lx\n",
argv[0], size, section_header_size);
free(sh_table);
fclose(felf);
return 27;
}
sh_index = le16_to_cpu(header.e_shstrndx);
sh_size = le64_to_cpu(sh_table[sh_index].sh_size);
debug("e_shstrndx %x, sh_size %lx\n", sh_index, sh_size);
sh_str = malloc(sh_size);
if (!sh_str) {
fprintf(stderr, "malloc failed\n");
free(sh_table);
fclose(felf);
return 28;
}
/*
* Specifies the byte offset from the beginning of the file
* to the first byte in the section.
*/
sh_offset = le64_to_cpu(sh_table[sh_index].sh_offset);
sh_num = le16_to_cpu(header.e_shnum);
ret = fseek(felf, sh_offset, SEEK_SET);
if (ret) {
fprintf(stderr, "Setting up sh_offset failed\n");
free(sh_str);
free(sh_table);
fclose(felf);
return 29;
}
size = fread(sh_str, 1, sh_size, felf);
if (size != sh_size) {
fprintf(stderr, "%s: Can't read section: %lx/%lx\n",
argv[0], size, sh_size);
free(sh_str);
free(sh_table);
fclose(felf);
return 30;
}
for (i = 0; i < sh_num; i++) {
char *sh_name = sh_str + le32_to_cpu(sh_table[i].sh_name);
debug("%s\n", sh_name);
sh_addr = le64_to_cpu(sh_table[i].sh_addr);
sh_offset = le64_to_cpu(sh_table[i].sh_offset);
sh_size = le64_to_cpu(sh_table[i].sh_size);
if (!strcmp(".rela.dyn", sh_name)) {
debug("Found section\t\".rela_dyn\"\n");
debug(" at addr\t0x%08x\n", sh_addr);
debug(" at offset\t0x%08x\n", sh_offset);
debug(" of size\t0x%08x\n", sh_size);
rela_start = sh_addr;
rela_end = rela_start + sh_size;
break;
}
}
/* Clean up */
free(sh_str);
free(sh_table);
fclose(felf);
debug("text_base\t0x%08lx\n", text_base);
debug("rela_start\t0x%08lx\n", rela_start);
debug("rela_end\t0x%08lx\n", rela_end);
if (!rela_start)
return 1;
return 0;
}
static int decode_elf32(FILE *felf, char **argv)
{
size_t size;
Elf32_Ehdr header;
uint64_t section_header_base, section_header_size;
uint32_t sh_addr, sh_offset, sh_size;
Elf32_Half sh_index, sh_num;
Elf32_Shdr *sh_table; /* Elf symbol table */
int ret, i, machine;
char *sh_str;
debug("32bit version\n");
/* Make sure we are at start */
rewind(felf);
size = fread(&header, 1, sizeof(header), felf);
if (size != sizeof(header)) {
fclose(felf);
return 25;
}
machine = elf16_to_cpu(header.e_machine);
debug("Machine %d\n", machine);
if (machine != EM_MICROBLAZE) {
fprintf(stderr, "%s: Not supported machine type\n", argv[0]);
return 30;
}
text_base = elf32_to_cpu(header.e_entry);
section_header_base = elf32_to_cpu(header.e_shoff);
section_header_size = elf16_to_cpu(header.e_shentsize) *
elf16_to_cpu(header.e_shnum);
sh_table = malloc(section_header_size);
if (!sh_table) {
fprintf(stderr, "%s: Cannot allocate space for section header\n",
argv[0]);
fclose(felf);
return 26;
}
ret = fseek(felf, section_header_base, SEEK_SET);
if (ret) {
fprintf(stderr, "%s: Can't set pointer to section header: %x/%lx\n",
argv[0], ret, section_header_base);
free(sh_table);
fclose(felf);
return 26;
}
size = fread(sh_table, 1, section_header_size, felf);
if (size != section_header_size) {
fprintf(stderr, "%s: Can't read section header: %lx/%lx\n",
argv[0], size, section_header_size);
free(sh_table);
fclose(felf);
return 27;
}
sh_index = elf16_to_cpu(header.e_shstrndx);
sh_size = elf32_to_cpu(sh_table[sh_index].sh_size);
debug("e_shstrndx %x, sh_size %lx\n", sh_index, sh_size);
sh_str = malloc(sh_size);
if (!sh_str) {
fprintf(stderr, "malloc failed\n");
free(sh_table);
fclose(felf);
return 28;
}
/*
* Specifies the byte offset from the beginning of the file
* to the first byte in the section.
*/
sh_offset = elf32_to_cpu(sh_table[sh_index].sh_offset);
sh_num = elf16_to_cpu(header.e_shnum);
ret = fseek(felf, sh_offset, SEEK_SET);
if (ret) {
fprintf(stderr, "Setting up sh_offset failed\n");
free(sh_str);
free(sh_table);
fclose(felf);
return 29;
}
size = fread(sh_str, 1, sh_size, felf);
if (size != sh_size) {
fprintf(stderr, "%s: Can't read section: %lx/%x\n",
argv[0], size, sh_size);
free(sh_str);
free(sh_table);
fclose(felf);
return 30;
}
for (i = 0; i < sh_num; i++) {
char *sh_name = sh_str + elf32_to_cpu(sh_table[i].sh_name);
debug("%s\n", sh_name);
sh_addr = elf32_to_cpu(sh_table[i].sh_addr);
sh_offset = elf32_to_cpu(sh_table[i].sh_offset);
sh_size = elf32_to_cpu(sh_table[i].sh_size);
if (!strcmp(".rela.dyn", sh_name)) {
debug("Found section\t\".rela_dyn\"\n");
debug(" at addr\t0x%08x\n", sh_addr);
debug(" at offset\t0x%08x\n", sh_offset);
debug(" of size\t0x%08x\n", sh_size);
rela_start = sh_addr;
rela_end = rela_start + sh_size;
}
if (!strcmp(".dynsym", sh_name)) {
debug("Found section\t\".dynsym\"\n");
debug(" at addr\t0x%08x\n", sh_addr);
debug(" at offset\t0x%08x\n", sh_offset);
debug(" of size\t0x%08x\n", sh_size);
dyn_start = sh_addr;
}
}
/* Clean up */
free(sh_str);
free(sh_table);
fclose(felf);
debug("text_base\t0x%08lx\n", text_base);
debug("rela_start\t0x%08lx\n", rela_start);
debug("rela_end\t0x%08lx\n", rela_end);
debug("dyn_start\t0x%08lx\n", dyn_start);
if (!rela_start)
return 1;
return 0;
}
static int decode_elf(char **argv)
{
FILE *felf;
size_t size;
unsigned char e_ident[EI_NIDENT];
felf = fopen(argv[2], "r+b");
if (!felf) {
fprintf(stderr, "%s: Cannot open %s: %s\n",
argv[0], argv[5], strerror(errno));
return 2;
}
size = fread(e_ident, 1, EI_NIDENT, felf);
if (size != EI_NIDENT) {
fclose(felf);
return 25;
}
/* Check if this is really ELF file */
if (e_ident[0] != 0x7f &&
e_ident[1] != 'E' &&
e_ident[2] != 'L' &&
e_ident[3] != 'F') {
fclose(felf);
return 1;
}
ei_class = e_ident[4];
debug("EI_CLASS(1=32bit, 2=64bit) %d\n", ei_class);
ei_data = e_ident[5];
debug("EI_DATA(1=little endian, 2=big endian) %d\n", ei_data);
if (ei_class == 2)
return decode_elf64(felf, argv);
return decode_elf32(felf, argv);
}
static int rela_elf64(char **argv, FILE *f)
{
int i, num;
if ((rela_end - rela_start) % sizeof(Elf64_Rela)) {
fprintf(stderr, "%s: rela size isn't a multiple of Elf64_Rela\n", argv[0]);
return 3;
}
num = (rela_end - rela_start) / sizeof(Elf64_Rela);
for (i = 0; i < num; i++) {
Elf64_Rela rela, swrela;
uint64_t pos = rela_start + sizeof(Elf64_Rela) * i;
uint64_t addr;
if (fseek(f, pos, SEEK_SET) < 0) {
fprintf(stderr, "%s: %s: seek to %" PRIx64
" failed: %s\n",
argv[0], argv[1], pos, strerror(errno));
}
if (fread(&rela, sizeof(rela), 1, f) != 1) {
fprintf(stderr, "%s: %s: read rela failed at %"
PRIx64 "\n",
argv[0], argv[1], pos);
return 4;
}
swrela.r_offset = le64_to_cpu(rela.r_offset);
swrela.r_info = le64_to_cpu(rela.r_info);
swrela.r_addend = le64_to_cpu(rela.r_addend);
if (!supported_rela(&swrela))
continue;
debug("Rela %" PRIx64 " %" PRIu64 " %" PRIx64 "\n",
swrela.r_offset, swrela.r_info, swrela.r_addend);
if (swrela.r_offset < text_base) {
fprintf(stderr, "%s: %s: bad rela at %" PRIx64 "\n",
argv[0], argv[1], pos);
return 4;
}
addr = swrela.r_offset - text_base;
if (fseek(f, addr, SEEK_SET) < 0) {
fprintf(stderr, "%s: %s: seek to %"
PRIx64 " failed: %s\n",
argv[0], argv[1], addr, strerror(errno));
}
if (fwrite(&rela.r_addend, sizeof(rela.r_addend), 1, f) != 1) {
fprintf(stderr, "%s: %s: write failed at %" PRIx64 "\n",
argv[0], argv[1], addr);
return 4;
}
}
return 0;
}
static bool supported_rela32(Elf32_Rela *rela, uint32_t *type)
{
uint32_t mask = 0xffULL; /* would be different on 32-bit */
*type = rela->r_info & mask;
debug("Type:\t");
switch (*type) {
case R_MICROBLAZE_32:
debug("R_MICROBLAZE_32\n");
return true;
case R_MICROBLAZE_GLOB_DAT:
debug("R_MICROBLAZE_GLOB_DAT\n");
return true;
case R_MICROBLAZE_NONE:
debug("R_MICROBLAZE_NONE - ignoring - do nothing\n");
return false;
case R_MICROBLAZE_REL:
debug("R_MICROBLAZE_REL\n");
return true;
default:
fprintf(stderr, "warning: unsupported relocation type %"
PRIu32 " at %" PRIx32 "\n", *type, rela->r_offset);
return false;
}
}
static int rela_elf32(char **argv, FILE *f)
{
int i, num, index;
uint32_t value, type;
if ((rela_end - rela_start) % sizeof(Elf32_Rela)) {
fprintf(stderr, "%s: rela size isn't a multiple of Elf32_Rela\n", argv[0]);
return 3;
}
num = (rela_end - rela_start) / sizeof(Elf32_Rela);
debug("Number of entries: %u\n", num);
for (i = 0; i < num; i++) {
Elf32_Rela rela, swrela;
Elf32_Sym symbols;
uint32_t pos = rela_start + sizeof(Elf32_Rela) * i;
uint32_t addr, pos_dyn;
debug("\nPossition:\t%d/0x%x\n", i, pos);
if (fseek(f, pos, SEEK_SET) < 0) {
fprintf(stderr, "%s: %s: seek to %" PRIx32
" failed: %s\n",
argv[0], argv[1], pos, strerror(errno));
}
if (fread(&rela, sizeof(rela), 1, f) != 1) {
fprintf(stderr, "%s: %s: read rela failed at %"
PRIx32 "\n",
argv[0], argv[1], pos);
return 4;
}
debug("Rela:\toffset:\t%" PRIx32 " r_info:\t%"
PRIu32 " r_addend:\t%" PRIx32 "\n",
rela.r_offset, rela.r_info, rela.r_addend);
swrela.r_offset = elf32_to_cpu(rela.r_offset);
swrela.r_info = elf32_to_cpu(rela.r_info);
swrela.r_addend = elf32_to_cpu(rela.r_addend);
debug("SWRela:\toffset:\t%" PRIx32 " r_info:\t%"
PRIu32 " r_addend:\t%" PRIx32 "\n",
swrela.r_offset, swrela.r_info, swrela.r_addend);
if (!supported_rela32(&swrela, &type))
continue;
if (swrela.r_offset < text_base) {
fprintf(stderr, "%s: %s: bad rela at %" PRIx32 "\n",
argv[0], argv[1], pos);
return 4;
}
addr = swrela.r_offset - text_base;
debug("Addr:\t0x%" PRIx32 "\n", addr);
switch (type) {
case R_MICROBLAZE_REL:
if (fseek(f, addr, SEEK_SET) < 0) {
fprintf(stderr, "%s: %s: seek to %"
PRIx32 " failed: %s\n",
argv[0], argv[1], addr, strerror(errno));
return 5;
}
debug("Write addend\n");
if (fwrite(&rela.r_addend, sizeof(rela.r_addend), 1, f) != 1) {
fprintf(stderr, "%s: %s: write failed at %" PRIx32 "\n",
argv[0], argv[1], addr);
return 4;
}
break;
case R_MICROBLAZE_32:
case R_MICROBLAZE_GLOB_DAT:
/* global symbols read it and add reloc offset */
index = swrela.r_info >> 8;
pos_dyn = dyn_start + sizeof(Elf32_Sym) * index;
debug("Index:\t%d\n", index);
debug("Pos_dyn:\t0x%x\n", pos_dyn);
if (fseek(f, pos_dyn, SEEK_SET) < 0) {
fprintf(stderr, "%s: %s: seek to %"
PRIx32 " failed: %s\n",
argv[0], argv[1], pos_dyn, strerror(errno));
return 5;
}
if (fread(&symbols, sizeof(symbols), 1, f) != 1) {
fprintf(stderr, "%s: %s: read symbols failed at %"
PRIx32 "\n",
argv[0], argv[1], pos_dyn);
return 4;
}
debug("Symbol description:\n");
debug(" st_name:\t0x%x\n", symbols.st_name);
debug(" st_value:\t0x%x\n", symbols.st_value);
debug(" st_size:\t0x%x\n", symbols.st_size);
value = swrela.r_addend + symbols.st_value;
debug("Value:\t0x%x\n", value);
if (fseek(f, addr, SEEK_SET) < 0) {
fprintf(stderr, "%s: %s: seek to %"
PRIx32 " failed: %s\n",
argv[0], argv[1], addr, strerror(errno));
return 5;
}
if (fwrite(&value, sizeof(rela.r_addend), 1, f) != 1) {
fprintf(stderr, "%s: %s: write failed at %" PRIx32 "\n",
argv[0], argv[1], addr);
return 4;
}
break;
case R_MICROBLAZE_NONE:
debug("R_MICROBLAZE_NONE - skip\n");
break;
default:
fprintf(stderr, "warning: unsupported relocation type %"
PRIu32 " at %" PRIx32 "\n",
type, rela.r_offset);
}
}
return 0;
}
int main(int argc, char **argv)
{
FILE *f;
int ret;
uint64_t file_size;
if (argc != 3) {
fprintf(stderr, "Statically apply ELF rela relocations\n");
fprintf(stderr, "Usage: %s <bin file> <u-boot ELF>\n",
argv[0]);
return 1;
}
ret = decode_elf(argv);
if (ret) {
fprintf(stderr, "ELF decoding failed\n");
return ret;
}
if (rela_start > rela_end || rela_start < text_base) {
fprintf(stderr, "%s: bad rela bounds\n", argv[0]);
return 3;
}
rela_start -= text_base;
rela_end -= text_base;
dyn_start -= text_base;
f = fopen(argv[1], "r+b");
if (!f) {
fprintf(stderr, "%s: Cannot open %s: %s\n",
argv[0], argv[1], strerror(errno));
return 2;
}
fseek(f, 0, SEEK_END);
file_size = ftell(f);
rewind(f);
if (rela_end > file_size) {
// Most likely compiler inserted some section that didn't get
// objcopy-ed into the final binary
rela_end = file_size;
}
if (ei_class == 2)
ret = rela_elf64(argv, f);
else
ret = rela_elf32(argv, f);
if (fclose(f) < 0) {
fprintf(stderr, "%s: %s: close failed: %s\n",
argv[0], argv[1], strerror(errno));
return 4;
}
return ret;
}
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