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android13/device/google/contexthub/util/nanoapp_postprocess/postprocess_elf.c

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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <assert.h>
#include <fcntl.h>
#include <gelf.h>
#include <libelf.h>
#include <sys/types.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdio.h>
#include <stddef.h>
#include <errno.h>
#include <nanohub/nanohub.h>
#include <nanohub/nanoapp.h>
#include <nanohub/appRelocFormat.h>
//This code assumes it is run on a LE CPU with unaligned access abilities. Sorry.
#define FLASH_BASE 0x10000000
#define RAM_BASE 0x80000000
#define FLASH_SIZE 0x10000000 //256MB ought to be enough for everyone
#define RAM_SIZE 0x10000000 //256MB ought to be enough for everyone
//caution: double evaluation
#define IS_IN_RANGE_E(_val, _rstart, _rend) (((_val) >= (_rstart)) && ((_val) < (_rend)))
#define IS_IN_RANGE(_val, _rstart, _rsz) IS_IN_RANGE_E((_val), (_rstart), ((_rstart) + (_rsz)))
#define IS_IN_RAM(_val) IS_IN_RANGE(_val, RAM_BASE, RAM_SIZE)
#define IS_IN_FLASH(_val) IS_IN_RANGE(_val, FLASH_BASE, FLASH_SIZE)
#define NANO_RELOC_TYPE_RAM 0
#define NANO_RELOC_TYPE_FLASH 1
#define NANO_RELOC_LAST 2 //must be <= (RELOC_TYPE_MASK >> RELOC_TYPE_SHIFT)
struct RelocEntry {
uint32_t where;
uint32_t info; //bottom 8 bits is type, top 24 is sym idx
};
#define RELOC_TYPE_ABS_S 2
#define RELOC_TYPE_ABS_D 21
#define RELOC_TYPE_SECT 23
struct SymtabEntry {
uint32_t a;
uint32_t addr;
uint32_t b, c;
};
struct NanoRelocEntry {
uint32_t ofstInRam;
uint8_t type;
};
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(ary) (sizeof(ary) / sizeof((ary)[0]))
#endif
#define DBG(fmt, ...) printf(fmt "\n", ##__VA_ARGS__)
#define ERR(fmt, ...) fprintf(stderr, fmt "\n", ##__VA_ARGS__)
// Prints the given message followed by the most recent libelf error
#define ELF_ERR(fmt, ...) ERR(fmt ": %s\n", ##__VA_ARGS__, elf_errmsg(-1))
struct ElfAppSection {
void *data;
size_t size;
};
struct ElfNanoApp {
struct ElfAppSection flash;
struct ElfAppSection data;
struct ElfAppSection relocs;
struct ElfAppSection symtab;
// Not parsed from file, but constructed via genElfNanoRelocs
struct ElfAppSection packedNanoRelocs;
};
static void fatalUsage(const char *name, const char *msg, const char *arg)
{
if (msg && arg)
fprintf(stderr, "Error: %s: %s\n\n", msg, arg);
else if (msg)
fprintf(stderr, "Error: %s\n\n", msg);
fprintf(stderr, "USAGE: %s [-v] [-k <key id>] [-a <app id>] [-r] [-n <layout name>] [-i <layout id>] <input file> [<output file>]\n"
" -v : be verbose\n"
" -n <layout name> : app, os, key\n"
" -i <layout id> : 1 (app), 2 (key), 3 (os)\n"
" -f <layout flags>: 16-bit hex value, stored as layout-specific flags\n"
" -c <chre api> : 16-bit hex value, stored as chre-major + chre-minor\n"
" -a <app ID> : 64-bit hex number != 0\n"
" -e <app version> : 32-bit hex number\n"
" -k <key ID> : 64-bit hex number != 0\n"
" -r : bare (no AOSP header); used only for inner OS image generation\n"
" -s : treat input as statically linked ELF (app layout only)\n"
" layout ID and layout name control the same parameter, so only one of them needs to be used\n"
, name);
exit(1);
}
static uint8_t *packNanoRelocs(struct NanoRelocEntry *nanoRelocs, uint32_t outNumRelocs, uint32_t *finalPackedNanoRelocSz, bool verbose)
{
uint32_t i, j, k;
uint8_t *packedNanoRelocs;
uint32_t packedNanoRelocSz;
uint32_t lastOutType = 0, origin = 0;
//sort by type and then offset
for (i = 0; i < outNumRelocs; i++) {
struct NanoRelocEntry t;
for (k = i, j = k + 1; j < outNumRelocs; j++) {
if (nanoRelocs[j].type > nanoRelocs[k].type)
continue;
if ((nanoRelocs[j].type < nanoRelocs[k].type) || (nanoRelocs[j].ofstInRam < nanoRelocs[k].ofstInRam))
k = j;
}
memcpy(&t, nanoRelocs + i, sizeof(struct NanoRelocEntry));
memcpy(nanoRelocs + i, nanoRelocs + k, sizeof(struct NanoRelocEntry));
memcpy(nanoRelocs + k, &t, sizeof(struct NanoRelocEntry));
if (verbose)
fprintf(stderr, "SortedReloc[%3" PRIu32 "] = {0x%08" PRIX32 ",0x%02" PRIX8 "}\n", i, nanoRelocs[i].ofstInRam, nanoRelocs[i].type);
}
//produce output nanorelocs in packed format
packedNanoRelocs = malloc(outNumRelocs * 6); //definitely big enough
packedNanoRelocSz = 0;
for (i = 0; i < outNumRelocs; i++) {
uint32_t displacement;
if (lastOutType != nanoRelocs[i].type) { //output type if ti changed
if (nanoRelocs[i].type - lastOutType == 1) {
packedNanoRelocs[packedNanoRelocSz++] = TOKEN_RELOC_TYPE_NEXT;
if (verbose)
fprintf(stderr, "Out: RelocTC (1) // to 0x%02" PRIX8 "\n", nanoRelocs[i].type);
}
else {
packedNanoRelocs[packedNanoRelocSz++] = TOKEN_RELOC_TYPE_CHG;
packedNanoRelocs[packedNanoRelocSz++] = nanoRelocs[i].type - lastOutType - 1;
if (verbose)
fprintf(stderr, "Out: RelocTC (0x%02" PRIX8 ") // to 0x%02" PRIX8 "\n", (uint8_t)(nanoRelocs[i].type - lastOutType - 1), nanoRelocs[i].type);
}
lastOutType = nanoRelocs[i].type;
origin = 0;
}
displacement = nanoRelocs[i].ofstInRam - origin;
origin = nanoRelocs[i].ofstInRam + 4;
if (displacement & 3) {
fprintf(stderr, "Unaligned relocs are not possible!\n");
exit(-5);
}
displacement /= 4;
//might be start of a run. look into that
if (!displacement) {
for (j = 1; j + i < outNumRelocs && j < MAX_RUN_LEN && nanoRelocs[j + i].type == lastOutType && nanoRelocs[j + i].ofstInRam - nanoRelocs[j + i - 1].ofstInRam == 4; j++);
if (j >= MIN_RUN_LEN) {
if (verbose)
fprintf(stderr, "Out: Reloc0 x%" PRIX32 "\n", j);
packedNanoRelocs[packedNanoRelocSz++] = TOKEN_CONSECUTIVE;
packedNanoRelocs[packedNanoRelocSz++] = j - MIN_RUN_LEN;
origin = nanoRelocs[j + i - 1].ofstInRam + 4; //reset origin to last one
i += j - 1; //loop will increment anyways, hence +1
continue;
}
}
//produce output
if (displacement <= MAX_8_BIT_NUM) {
if (verbose)
fprintf(stderr, "Out: Reloc8 0x%02" PRIX32 "\n", displacement);
packedNanoRelocs[packedNanoRelocSz++] = displacement;
}
else if (displacement <= MAX_16_BIT_NUM) {
if (verbose)
fprintf(stderr, "Out: Reloc16 0x%06" PRIX32 "\n", displacement);
displacement -= MAX_8_BIT_NUM;
packedNanoRelocs[packedNanoRelocSz++] = TOKEN_16BIT_OFST;
packedNanoRelocs[packedNanoRelocSz++] = displacement;
packedNanoRelocs[packedNanoRelocSz++] = displacement >> 8;
}
else if (displacement <= MAX_24_BIT_NUM) {
if (verbose)
fprintf(stderr, "Out: Reloc24 0x%08" PRIX32 "\n", displacement);
displacement -= MAX_16_BIT_NUM;
packedNanoRelocs[packedNanoRelocSz++] = TOKEN_24BIT_OFST;
packedNanoRelocs[packedNanoRelocSz++] = displacement;
packedNanoRelocs[packedNanoRelocSz++] = displacement >> 8;
packedNanoRelocs[packedNanoRelocSz++] = displacement >> 16;
}
else {
if (verbose)
fprintf(stderr, "Out: Reloc32 0x%08" PRIX32 "\n", displacement);
packedNanoRelocs[packedNanoRelocSz++] = TOKEN_32BIT_OFST;
packedNanoRelocs[packedNanoRelocSz++] = displacement;
packedNanoRelocs[packedNanoRelocSz++] = displacement >> 8;
packedNanoRelocs[packedNanoRelocSz++] = displacement >> 16;
packedNanoRelocs[packedNanoRelocSz++] = displacement >> 24;
}
}
*finalPackedNanoRelocSz = packedNanoRelocSz;
return packedNanoRelocs;
}
static int finalizeAndWrite(uint8_t *buf, uint32_t bufUsed, uint32_t bufSz, FILE *out, uint32_t layoutFlags, uint64_t appId, uint32_t chreApi)
{
int ret;
struct AppInfo app;
struct SectInfo *sect;
struct BinHdr *bin = (struct BinHdr *) buf;
struct ImageHeader outHeader = {
.aosp = (struct nano_app_binary_t) {
.header_version = 1,
.magic = NANOAPP_AOSP_MAGIC,
.app_id = appId,
.app_version = bin->hdr.appVer,
.flags = 0, // encrypted (1), signed (2) (will be set by other tools)
.chre_api_major = chreApi >> 8,
.chre_api_minor = chreApi & 0xFF,
},
.layout = (struct ImageLayout) {
.magic = GOOGLE_LAYOUT_MAGIC,
.version = 1,
.payload = LAYOUT_APP,
.flags = layoutFlags | (chreApi ? 0x0010 : 0x0000),
},
};
uint32_t dataOffset = sizeof(outHeader) + sizeof(app);
uint32_t hdrDiff = dataOffset - sizeof(*bin);
app.sect = bin->sect;
app.vec = bin->vec;
assertMem(bufUsed + hdrDiff, bufSz);
memmove(buf + dataOffset, buf + sizeof(*bin), bufUsed - sizeof(*bin));
bufUsed += hdrDiff;
memcpy(buf, &outHeader, sizeof(outHeader));
memcpy(buf + sizeof(outHeader), &app, sizeof(app));
sect = &app.sect;
//if we have any bytes to output, show stats
if (bufUsed) {
uint32_t codeAndRoDataSz = sect->data_data;
uint32_t relocsSz = sect->rel_end - sect->rel_start;
uint32_t gotSz = sect->got_end - sect->data_start;
uint32_t bssSz = sect->bss_end - sect->bss_start;
fprintf(stderr,"Final binary size %" PRIu32 " bytes\n", bufUsed);
fprintf(stderr, "\n");
fprintf(stderr, " FW header size (flash): %6zu bytes\n", FLASH_RELOC_OFFSET);
fprintf(stderr, " Code + RO data (flash): %6" PRIu32 " bytes\n", codeAndRoDataSz);
fprintf(stderr, " Relocs (flash): %6" PRIu32 " bytes\n", relocsSz);
fprintf(stderr, " GOT + RW data (flash & RAM): %6" PRIu32 " bytes\n", gotSz);
fprintf(stderr, " BSS (RAM): %6" PRIu32 " bytes\n", bssSz);
fprintf(stderr, "\n");
fprintf(stderr,"Runtime flash use: %" PRIu32 " bytes\n", (uint32_t)(codeAndRoDataSz + relocsSz + gotSz + FLASH_RELOC_OFFSET));
fprintf(stderr,"Runtime RAM use: %" PRIu32 " bytes\n", gotSz + bssSz);
}
ret = fwrite(buf, bufUsed, 1, out) == 1 ? 0 : 2;
if (ret)
fprintf(stderr, "Failed to write output file: %s\n", strerror(errno));
return ret;
}
static int handleApp(uint8_t **pbuf, uint32_t bufUsed, FILE *out, uint32_t layoutFlags, uint64_t appId, uint32_t appVer, uint32_t chreApi, bool verbose)
{
uint32_t i, numRelocs, numSyms, outNumRelocs = 0, packedNanoRelocSz;
struct NanoRelocEntry *nanoRelocs = NULL;
struct RelocEntry *relocs;
struct SymtabEntry *syms;
uint8_t *packedNanoRelocs;
uint32_t t;
struct BinHdr *bin;
int ret = -1;
struct SectInfo *sect;
uint8_t *buf = *pbuf;
uint32_t bufSz = bufUsed * 3 /2;
//make buffer 50% bigger than bufUsed in case relocs grow out of hand
buf = reallocOrDie(buf, bufSz);
*pbuf = buf;
//sanity checks
bin = (struct BinHdr*)buf;
if (bufUsed < sizeof(*bin)) {
fprintf(stderr, "File size too small\n");
goto out;
}
if (bin->hdr.magic != NANOAPP_FW_MAGIC) {
fprintf(stderr, "Magic value is wrong: found %08" PRIX32
"; expected %08" PRIX32 "\n",
bin->hdr.magic, NANOAPP_FW_MAGIC);
goto out;
}
sect = &bin->sect;
bin->hdr.appVer = appVer;
//do some math
relocs = (struct RelocEntry*)(buf + sect->rel_start - FLASH_BASE);
syms = (struct SymtabEntry*)(buf + sect->rel_end - FLASH_BASE);
numRelocs = (sect->rel_end - sect->rel_start) / sizeof(struct RelocEntry);
numSyms = (bufUsed + FLASH_BASE - sect->rel_end) / sizeof(struct SymtabEntry);
//sanity
if (numRelocs * sizeof(struct RelocEntry) + sect->rel_start != sect->rel_end) {
fprintf(stderr, "Relocs of nonstandard size\n");
goto out;
}
if (numSyms * sizeof(struct SymtabEntry) + sect->rel_end != bufUsed + FLASH_BASE) {
fprintf(stderr, "Syms of nonstandard size\n");
goto out;
}
//show some info
fprintf(stderr, "\nRead %" PRIu32 " bytes of binary.\n", bufUsed);
if (verbose)
fprintf(stderr, "Found %" PRIu32 " relocs and a %" PRIu32 "-entry symbol table\n", numRelocs, numSyms);
//handle relocs
nanoRelocs = malloc(sizeof(struct NanoRelocEntry[numRelocs]));
if (!nanoRelocs) {
fprintf(stderr, "Failed to allocate a nano-reloc table\n");
goto out;
}
for (i = 0; i < numRelocs; i++) {
uint32_t relocType = relocs[i].info & 0xff;
uint32_t whichSym = relocs[i].info >> 8;
uint32_t *valThereP;
if (whichSym >= numSyms) {
fprintf(stderr, "Reloc %" PRIu32 " references a nonexistent symbol!\n"
"INFO:\n"
" Where: 0x%08" PRIX32 "\n"
" type: %" PRIu32 "\n"
" sym: %" PRIu32 "\n",
i, relocs[i].where, relocs[i].info & 0xff, whichSym);
goto out;
}
if (verbose) {
const char *seg;
fprintf(stderr, "Reloc[%3" PRIu32 "]:\n {@0x%08" PRIX32 ", type %3" PRIu32 ", -> sym[%3" PRIu32 "]: {@0x%08" PRIX32 "}, ",
i, relocs[i].where, relocs[i].info & 0xff, whichSym, syms[whichSym].addr);
if (IS_IN_RANGE_E(relocs[i].where, sect->bss_start, sect->bss_end))
seg = ".bss";
else if (IS_IN_RANGE_E(relocs[i].where, sect->data_start, sect->data_end))
seg = ".data";
else if (IS_IN_RANGE_E(relocs[i].where, sect->got_start, sect->got_end))
seg = ".got";
else if (IS_IN_RANGE_E(relocs[i].where, FLASH_BASE, FLASH_BASE + sizeof(struct BinHdr)))
seg = "APPHDR";
else
seg = "???";
fprintf(stderr, "in %s}\n", seg);
}
/* handle relocs inside the header */
if (IS_IN_FLASH(relocs[i].where) && relocs[i].where - FLASH_BASE < sizeof(struct BinHdr) && relocType == RELOC_TYPE_SECT) {
/* relocs in header are special - runtime corrects for them */
if (syms[whichSym].addr) {
fprintf(stderr, "Weird in-header sect reloc %" PRIu32 " to symbol %" PRIu32 " with nonzero addr 0x%08" PRIX32 "\n",
i, whichSym, syms[whichSym].addr);
goto out;
}
valThereP = (uint32_t*)(buf + relocs[i].where - FLASH_BASE);
if (!IS_IN_FLASH(*valThereP)) {
fprintf(stderr, "In-header reloc %" PRIu32 " of location 0x%08" PRIX32 " is outside of FLASH!\n"
"INFO:\n"
" type: %" PRIu32 "\n"
" sym: %" PRIu32 "\n"
" Sym Addr: 0x%08" PRIX32 "\n",
i, relocs[i].where, relocType, whichSym, syms[whichSym].addr);
goto out;
}
// binary header generated by objcopy, .napp header and final FW header in flash are of different size.
// we subtract binary header offset here, so all the entry points are relative to beginning of "sect".
// FW will use &sect as a base to call these vectors; no more problems with different header sizes;
// Assumption: offsets between sect & vec, vec & code are the same in all images (or, in a simpler words, { sect, vec, code }
// must go together). this is enforced by linker script, and maintained by all tools and FW download code in the OS.
*valThereP -= FLASH_BASE + BINARY_RELOC_OFFSET;
if (verbose)
fprintf(stderr, " -> Nano reloc skipped for in-header reloc\n");
continue; /* do not produce an output reloc */
}
if (!IS_IN_RAM(relocs[i].where)) {
fprintf(stderr, "In-header reloc %" PRIu32 " of location 0x%08" PRIX32 " is outside of RAM!\n"
"INFO:\n"
" type: %" PRIu32 "\n"
" sym: %" PRIu32 "\n"
" Sym Addr: 0x%08" PRIX32 "\n",
i, relocs[i].where, relocType, whichSym, syms[whichSym].addr);
goto out;
}
valThereP = (uint32_t*)(buf + relocs[i].where + sect->data_data - RAM_BASE - FLASH_BASE);
nanoRelocs[outNumRelocs].ofstInRam = relocs[i].where - RAM_BASE;
switch (relocType) {
case RELOC_TYPE_ABS_S:
case RELOC_TYPE_ABS_D:
t = *valThereP;
(*valThereP) += syms[whichSym].addr;
if (IS_IN_FLASH(syms[whichSym].addr)) {
(*valThereP) -= FLASH_BASE + BINARY_RELOC_OFFSET;
nanoRelocs[outNumRelocs].type = NANO_RELOC_TYPE_FLASH;
}
else if (IS_IN_RAM(syms[whichSym].addr)) {
(*valThereP) -= RAM_BASE;
nanoRelocs[outNumRelocs].type = NANO_RELOC_TYPE_RAM;
}
else {
fprintf(stderr, "Weird reloc %" PRIu32 " to symbol %" PRIu32 " in unknown memory space (addr 0x%08" PRIX32 ")\n",
i, whichSym, syms[whichSym].addr);
goto out;
}
if (verbose)
fprintf(stderr, " -> Abs reference fixed up 0x%08" PRIX32 " -> 0x%08" PRIX32 "\n", t, *valThereP);
break;
case RELOC_TYPE_SECT:
if (syms[whichSym].addr) {
fprintf(stderr, "Weird sect reloc %" PRIu32 " to symbol %" PRIu32 " with nonzero addr 0x%08" PRIX32 "\n",
i, whichSym, syms[whichSym].addr);
goto out;
}
t = *valThereP;
if (IS_IN_FLASH(*valThereP)) {
nanoRelocs[outNumRelocs].type = NANO_RELOC_TYPE_FLASH;
*valThereP -= FLASH_BASE + BINARY_RELOC_OFFSET;
}
else if (IS_IN_RAM(*valThereP)) {
nanoRelocs[outNumRelocs].type = NANO_RELOC_TYPE_RAM;
*valThereP -= RAM_BASE;
}
else {
fprintf(stderr, "Weird sec reloc %" PRIu32 " to symbol %" PRIu32
" in unknown memory space (addr 0x%08" PRIX32 ")\n",
i, whichSym, *valThereP);
goto out;
}
if (verbose)
fprintf(stderr, " -> Sect reference fixed up 0x%08" PRIX32 " -> 0x%08" PRIX32 "\n", t, *valThereP);
break;
default:
fprintf(stderr, "Weird reloc %" PRIX32 " type %" PRIX32 " to symbol %" PRIX32 "\n", i, relocType, whichSym);
goto out;
}
if (verbose)
fprintf(stderr, " -> Nano reloc calculated as 0x%08" PRIX32 ",0x%02" PRIX8 "\n", nanoRelocs[i].ofstInRam, nanoRelocs[i].type);
outNumRelocs++;
}
packedNanoRelocs = packNanoRelocs(nanoRelocs, outNumRelocs, &packedNanoRelocSz, verbose);
//overwrite original relocs and symtab with nanorelocs and adjust sizes
memcpy(relocs, packedNanoRelocs, packedNanoRelocSz);
bufUsed -= sizeof(struct RelocEntry[numRelocs]);
bufUsed -= sizeof(struct SymtabEntry[numSyms]);
bufUsed += packedNanoRelocSz;
assertMem(bufUsed, bufSz);
sect->rel_end = sect->rel_start + packedNanoRelocSz;
//sanity
if (sect->rel_end - FLASH_BASE != bufUsed) {
fprintf(stderr, "Relocs end and file end not coincident\n");
goto out;
}
//adjust headers for easy access (RAM)
if (!IS_IN_RAM(sect->data_start) || !IS_IN_RAM(sect->data_end) || !IS_IN_RAM(sect->bss_start) ||
!IS_IN_RAM(sect->bss_end) || !IS_IN_RAM(sect->got_start) || !IS_IN_RAM(sect->got_end)) {
fprintf(stderr, "data, bss, or got not in ram\n");
goto out;
}
sect->data_start -= RAM_BASE;
sect->data_end -= RAM_BASE;
sect->bss_start -= RAM_BASE;
sect->bss_end -= RAM_BASE;
sect->got_start -= RAM_BASE;
sect->got_end -= RAM_BASE;
//adjust headers for easy access (FLASH)
if (!IS_IN_FLASH(sect->data_data) || !IS_IN_FLASH(sect->rel_start) || !IS_IN_FLASH(sect->rel_end)) {
fprintf(stderr, "data.data, or rel not in flash\n");
goto out;
}
sect->data_data -= FLASH_BASE + BINARY_RELOC_OFFSET;
sect->rel_start -= FLASH_BASE + BINARY_RELOC_OFFSET;
sect->rel_end -= FLASH_BASE + BINARY_RELOC_OFFSET;
ret = finalizeAndWrite(buf, bufUsed, bufSz, out, layoutFlags, appId, chreApi);
out:
free(nanoRelocs);
return ret;
}
static void elfExtractSectionPointer(const Elf_Data *data, const char *name, struct ElfNanoApp *app)
{
// Maps section names to their byte offset in struct ElfNanoApp. Note that
// this assumes that the linker script puts text/code in the .flash section,
// RW data in .data, that relocs for .data are included in .rel.data, and
// the symbol table is emitted in .symtab
const struct SectionMap {
const char *name;
size_t offset;
} sectionMap[] = {
{
.name = ".flash",
.offset = offsetof(struct ElfNanoApp, flash),
},
{
.name = ".data",
.offset = offsetof(struct ElfNanoApp, data),
},
{
.name = ".rel.data",
.offset = offsetof(struct ElfNanoApp, relocs),
},
{
.name = ".symtab",
.offset = offsetof(struct ElfNanoApp, symtab),
},
};
struct ElfAppSection *appSection;
uint8_t *appBytes = (uint8_t *) app;
for (size_t i = 0; i < ARRAY_SIZE(sectionMap); i++) {
if (strcmp(name, sectionMap[i].name) != 0) {
continue;
}
appSection = (struct ElfAppSection *) &appBytes[sectionMap[i].offset];
appSection->data = data->d_buf;
appSection->size = data->d_size;
DBG("Found section %s with size %zu", name, appSection->size);
break;
}
}
// Populates a struct ElfNanoApp with data parsed from the ELF
static bool elfParse(Elf *elf, struct ElfNanoApp *app)
{
size_t shdrstrndx;
Elf_Scn *scn = NULL;
GElf_Shdr shdr;
char *sectionName;
Elf_Data *elf_data;
memset(app, 0, sizeof(*app));
if (elf_getshdrstrndx(elf, &shdrstrndx) != 0) {
ELF_ERR("Couldn't get section name string table index");
return false;
}
while ((scn = elf_nextscn(elf, scn)) != NULL) {
if (gelf_getshdr(scn, &shdr) != &shdr) {
ELF_ERR("Error getting section header");
return false;
}
sectionName = elf_strptr(elf, shdrstrndx, shdr.sh_name);
elf_data = elf_getdata(scn, NULL);
if (!elf_data) {
ELF_ERR("Error getting data for section %s", sectionName);
return false;
}
elfExtractSectionPointer(elf_data, sectionName, app);
}
return true;
}
static bool loadNanoappElfFile(const char *fileName, struct ElfNanoApp *app)
{
int fd;
Elf *elf;
if (elf_version(EV_CURRENT) == EV_NONE) {
ELF_ERR("Failed to initialize ELF library");
return false;
}
fd = open(fileName, O_RDONLY, 0);
if (fd < 0) {
ERR("Failed to open file %s for reading: %s", fileName, strerror(errno));
return false;
}
elf = elf_begin(fd, ELF_C_READ, NULL);
if (elf == NULL) {
ELF_ERR("Failed to open ELF");
return false;
}
if (!elfParse(elf, app)) {
ERR("Failed to parse ELF file");
return false;
}
return true;
}
// Subtracts the fixed memory region offset from an absolute address and returns
// the associated NANO_RELOC_* value, or NANO_RELOC_LAST if the address is not
// in the expected range.
// Not strictly tied to ELF usage, but handled slightly differently.
static uint8_t fixupAddrElf(uint32_t *addr)
{
uint8_t type;
// TODO: this assumes that the host running this tool has the same
// endianness as the image file/target processor
if (IS_IN_FLASH(*addr)) {
DBG("Fixup addr 0x%08" PRIX32 " (flash) --> 0x%08" PRIX32, *addr,
(uint32_t) (*addr - (FLASH_BASE + BINARY_RELOC_OFFSET)));
*addr -= FLASH_BASE + BINARY_RELOC_OFFSET;
type = NANO_RELOC_TYPE_FLASH;
} else if (IS_IN_RAM(*addr)) {
DBG("Fixup addr 0x%08" PRIX32 " (ram) --> 0x%08" PRIX32, *addr,
*addr - RAM_BASE);
*addr -= RAM_BASE;
type = NANO_RELOC_TYPE_RAM;
} else {
DBG("Error: invalid address 0x%08" PRIX32, *addr);
type = NANO_RELOC_LAST;
}
return type;
}
// Fixup addresses in the header to be relative. Not strictly tied to the ELF
// format, but used only in that program flow in the current implementation.
static bool fixupHeaderElf(const struct ElfNanoApp *app)
{
struct BinHdr *hdr = (struct BinHdr *) app->flash.data;
DBG("Appyling fixups to header");
if (fixupAddrElf(&hdr->sect.data_start) != NANO_RELOC_TYPE_RAM ||
fixupAddrElf(&hdr->sect.data_end) != NANO_RELOC_TYPE_RAM ||
fixupAddrElf(&hdr->sect.bss_start) != NANO_RELOC_TYPE_RAM ||
fixupAddrElf(&hdr->sect.bss_end) != NANO_RELOC_TYPE_RAM ||
fixupAddrElf(&hdr->sect.got_start) != NANO_RELOC_TYPE_RAM ||
fixupAddrElf(&hdr->sect.got_end) != NANO_RELOC_TYPE_RAM) {
ERR(".data, .bss, or .got not in RAM address space!");
return false;
}
if (fixupAddrElf(&hdr->sect.rel_start) != NANO_RELOC_TYPE_FLASH ||
fixupAddrElf(&hdr->sect.rel_end) != NANO_RELOC_TYPE_FLASH ||
fixupAddrElf(&hdr->sect.data_data) != NANO_RELOC_TYPE_FLASH) {
ERR(".data loadaddr, or .relocs not in flash address space!");
return false;
}
if (fixupAddrElf(&hdr->vec.init) != NANO_RELOC_TYPE_FLASH ||
fixupAddrElf(&hdr->vec.end) != NANO_RELOC_TYPE_FLASH ||
fixupAddrElf(&hdr->vec.handle) != NANO_RELOC_TYPE_FLASH) {
ERR("Entry point(s) not in flash address space!");
return false;
}
return true;
}
// Fixup addresses in .data, .init_array/.fini_array, and .got, and generates
// packed array of nano reloc entries. The app header must have already been
// fixed up.
static bool genElfNanoRelocs(struct ElfNanoApp *app, bool verbose)
{
const struct BinHdr *hdr = (const struct BinHdr *) app->flash.data;
const struct SectInfo *sect = &hdr->sect;
bool success = false;
size_t numDataRelocs = app->relocs.size / sizeof(Elf32_Rel);
size_t gotCount = (sect->got_end - sect->got_start) / sizeof(uint32_t);
size_t numInitFuncs = (sect->bss_start - sect->data_end) / sizeof(uint32_t);
size_t totalRelocCount = (numDataRelocs + numInitFuncs + gotCount);
struct NanoRelocEntry *nanoRelocs = malloc(
totalRelocCount * sizeof(struct NanoRelocEntry));
if (!nanoRelocs) {
ERR("Couldn't allocate memory for nano relocs! Needed %zu bytes",
totalRelocCount * sizeof(struct NanoRelocEntry));
return false;
}
uint8_t *data = app->data.data;
const Elf32_Rel *relocs = (const Elf32_Rel *) app->relocs.data;
const Elf32_Sym *syms = (const Elf32_Sym *) app->symtab.data;
size_t numRelocs = 0;
DBG("Parsing relocs for .data (%zu):", numDataRelocs);
for (size_t i = 0; i < numDataRelocs; i++) {
uint32_t type = ELF32_R_TYPE(relocs[i].r_info);
uint32_t sym = ELF32_R_SYM(relocs[i].r_info);
DBG(" [%3zu] 0x%08" PRIx32 " type %2" PRIu32 " symIdx %3" PRIu32
" --> 0x%08" PRIx32, i, relocs[i].r_offset, type, sym,
syms[sym].st_value);
// Note that R_ARM_TARGET1 is used for .init_array/.fini_array support,
// and can be interpreted either as ABS32 or REL32, depending on the
// runtime; we expect it to be ABS32.
if (type == R_ARM_ABS32 || type == R_ARM_TARGET1) {
if (!IS_IN_RAM(relocs[i].r_offset)) {
ERR("Reloc for .data not in RAM address range!");
goto out;
}
uint32_t offset = relocs[i].r_offset - RAM_BASE;
uint32_t *addr = (uint32_t *) &data[offset];
nanoRelocs[numRelocs].type = fixupAddrElf(addr);
nanoRelocs[numRelocs].ofstInRam = offset;
numRelocs++;
} else {
// TODO: Assuming that the ELF only contains absolute addresses in
// the .data section; may need to handle other relocation types in
// the future
ERR("Error: Unexpected reloc type %" PRIu32 " at index %zu",
type, i);
goto out;
}
}
DBG("Updating GOT entries (%zu):", gotCount);
for (uint32_t offset = sect->got_start; offset < sect->got_end;
offset += sizeof(uint32_t)) {
uint32_t *addr = (uint32_t *) &data[offset];
// Skip values that are set to 0, these seem to be padding (?)
if (*addr) {
nanoRelocs[numRelocs].type = fixupAddrElf(addr);
nanoRelocs[numRelocs].ofstInRam = offset;
numRelocs++;
}
}
uint32_t packedNanoRelocSz = 0;
app->packedNanoRelocs.data = packNanoRelocs(
nanoRelocs, numRelocs, &packedNanoRelocSz, verbose);
app->packedNanoRelocs.size = packedNanoRelocSz;
success = true;
out:
free(nanoRelocs);
return success;
}
static int handleAppStatic(const char *fileName, FILE *out, uint32_t layoutFlags, uint64_t appId, uint32_t appVer, uint32_t chreApi, bool verbose)
{
struct ElfNanoApp app;
if (!loadNanoappElfFile(fileName, &app)
|| !fixupHeaderElf(&app)
|| !genElfNanoRelocs(&app, verbose)) {
exit(2);
}
// Construct a single contiguous buffer, with extra room to fit the
// ImageHeader that will be prepended by finalizeAndWrite(). Note that this
// will allocate a bit more space than is needed, because some of the data
// from BinHdr will get discarded.
// TODO: this should be refactored to just write the binary components in
// order rather than allocating a big buffer, and moving data around
size_t bufSize = app.flash.size + app.data.size + app.packedNanoRelocs.size
+ sizeof(struct ImageHeader);
uint8_t *buf = malloc(bufSize);
if (!buf) {
ERR("Failed to allocate %zu bytes for final app", bufSize);
exit(2);
}
size_t offset = 0;
memcpy(buf, app.flash.data, app.flash.size);
offset += app.flash.size;
memcpy(&buf[offset], app.data.data, app.data.size);
offset += app.data.size;
memcpy(&buf[offset], app.packedNanoRelocs.data, app.packedNanoRelocs.size);
offset += app.packedNanoRelocs.size;
// Update rel_end in the header to reflect the packed reloc size
struct BinHdr *hdr = (struct BinHdr *) buf;
hdr->sect.rel_end = hdr->sect.rel_start + app.packedNanoRelocs.size;
hdr->hdr.appVer = appVer;
return finalizeAndWrite(buf, offset, bufSize, out, layoutFlags, appId, chreApi);
// TODO: should free all memory we allocated... just letting the OS handle
// it for now
}
static int handleKey(uint8_t **pbuf, uint32_t bufUsed, FILE *out, uint32_t layoutFlags, uint64_t appId, uint64_t keyId)
{
uint8_t *buf = *pbuf;
struct KeyInfo ki = { .data = keyId };
bool good = true;
struct ImageHeader outHeader = {
.aosp = (struct nano_app_binary_t) {
.header_version = 1,
.magic = NANOAPP_AOSP_MAGIC,
.app_id = appId,
},
.layout = (struct ImageLayout) {
.magic = GOOGLE_LAYOUT_MAGIC,
.version = 1,
.payload = LAYOUT_KEY,
.flags = layoutFlags,
},
};
good = good && fwrite(&outHeader, sizeof(outHeader), 1, out) == 1;
good = good && fwrite(&ki, sizeof(ki), 1, out) == 1;
good = good && fwrite(buf, bufUsed, 1, out) == 1;
return good ? 0 : 2;
}
static int handleOs(uint8_t **pbuf, uint32_t bufUsed, FILE *out, uint32_t layoutFlags, bool bare)
{
uint8_t *buf = *pbuf;
bool good;
struct OsUpdateHdr os = {
.magic = OS_UPDT_MAGIC,
.marker = OS_UPDT_MARKER_INPROGRESS,
.size = bufUsed
};
struct ImageHeader outHeader = {
.aosp = (struct nano_app_binary_t) {
.header_version = 1,
.magic = NANOAPP_AOSP_MAGIC,
},
.layout = (struct ImageLayout) {
.magic = GOOGLE_LAYOUT_MAGIC,
.version = 1,
.payload = LAYOUT_OS,
.flags = layoutFlags,
},
};
if (!bare)
good = fwrite(&outHeader, sizeof(outHeader), 1, out) == 1;
else
good = fwrite(&os, sizeof(os), 1, out) == 1;
good = good && fwrite(buf, bufUsed, 1, out) == 1;
return good ? 0 : 2;
}
int main(int argc, char **argv)
{
uint32_t bufUsed = 0;
bool verbose = false;
uint8_t *buf = NULL;
uint64_t appId = 0;
uint64_t keyId = 0;
uint32_t appVer = 0;
uint32_t chreApi = 0;
uint32_t layoutId = 0;
uint32_t layoutFlags = 0;
int ret = -1;
uint32_t *u32Arg = NULL;
uint64_t *u64Arg = NULL;
const char **strArg = NULL;
const char *appName = argv[0];
int posArgCnt = 0;
const char *posArg[2] = { NULL };
FILE *out = NULL;
const char *layoutName = "app";
const char *prev = NULL;
bool bareData = false;
bool staticElf = false;
for (int i = 1; i < argc; i++) {
char *end = NULL;
if (argv[i][0] == '-') {
prev = argv[i];
if (!strcmp(argv[i], "-v"))
verbose = true;
else if (!strcmp(argv[i], "-r"))
bareData = true;
else if (!strcmp(argv[i], "-s"))
staticElf = true;
else if (!strcmp(argv[i], "-a"))
u64Arg = &appId;
else if (!strcmp(argv[i], "-c"))
u32Arg = &chreApi;
else if (!strcmp(argv[i], "-e"))
u32Arg = &appVer;
else if (!strcmp(argv[i], "-k"))
u64Arg = &keyId;
else if (!strcmp(argv[i], "-n"))
strArg = &layoutName;
else if (!strcmp(argv[i], "-i"))
u32Arg = &layoutId;
else if (!strcmp(argv[i], "-f"))
u32Arg = &layoutFlags;
else
fatalUsage(appName, "unknown argument", argv[i]);
} else {
if (u64Arg) {
uint64_t tmp = strtoull(argv[i], &end, 16);
if (*end == '\0')
*u64Arg = tmp;
u64Arg = NULL;
} else if (u32Arg) {
uint32_t tmp = strtoul(argv[i], &end, 16);
if (*end == '\0')
*u32Arg = tmp;
u32Arg = NULL;
} else if (strArg) {
*strArg = argv[i];
strArg = NULL;
} else {
if (posArgCnt < 2)
posArg[posArgCnt++] = argv[i];
else
fatalUsage(appName, "too many positional arguments", argv[i]);
}
prev = NULL;
}
}
if (prev)
fatalUsage(appName, "missing argument after", prev);
if (!posArgCnt)
fatalUsage(appName, "missing input file name", NULL);
if (!layoutId) {
if (strcmp(layoutName, "app") == 0)
layoutId = LAYOUT_APP;
else if (strcmp(layoutName, "os") == 0)
layoutId = LAYOUT_OS;
else if (strcmp(layoutName, "key") == 0)
layoutId = LAYOUT_KEY;
else
fatalUsage(appName, "Invalid layout name", layoutName);
}
if (staticElf && layoutId != LAYOUT_APP)
fatalUsage(appName, "Only app layout is supported for static option", NULL);
if (layoutId == LAYOUT_APP && !appId)
fatalUsage(appName, "App layout requires app ID", NULL);
if (layoutId == LAYOUT_KEY && !keyId)
fatalUsage(appName, "Key layout requires key ID", NULL);
if (layoutId == LAYOUT_OS && (keyId || appId))
fatalUsage(appName, "OS layout does not need any ID", NULL);
if (!staticElf) {
buf = loadFile(posArg[0], &bufUsed);
fprintf(stderr, "Read %" PRIu32 " bytes\n", bufUsed);
}
if (!posArg[1])
out = stdout;
else
out = fopen(posArg[1], "w");
if (!out)
fatalUsage(appName, "failed to create/open output file", posArg[1]);
switch(layoutId) {
case LAYOUT_APP:
if (staticElf) {
ret = handleAppStatic(posArg[0], out, layoutFlags, appId, appVer, chreApi, verbose);
} else {
ret = handleApp(&buf, bufUsed, out, layoutFlags, appId, appVer, chreApi, verbose);
}
break;
case LAYOUT_KEY:
ret = handleKey(&buf, bufUsed, out, layoutFlags, appId, keyId);
break;
case LAYOUT_OS:
ret = handleOs(&buf, bufUsed, out, layoutFlags, bareData);
break;
}
free(buf);
fclose(out);
return ret;
}
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