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remoteproc: Add elf64 support in elf loader

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In order to support elf64, use macros from remoteproc_elf_helpers.h
to access elf headers depending on elf class.
To allow new drivers to support elf64, add rproc_elf_sanity_check
function which make more sense than adding a elf64 named one since
it will support both elf versions.
Driver which need to support both elf32/elf64 should use this new
function for elf sanity check instead of the elf32 one.

Signed-off-by: Clement Leger <cleger@kalray.eu>
Tested-by: Arnaud POULIQUEN <arnaud.pouliquen@st.com>
Link: https://lore.kernel.org/r/20200302093902.27849-7-cleger@kalray.eu
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Clement Leger 2020-03-02 10:39:00 +01:00 committed by Bjorn Andersson
parent 826c339099
commit f31e339f1b
3 changed files with 139 additions and 55 deletions
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2
Documentation/remoteproc.txt
View File

@ -230,7 +230,7 @@ in the used rings.
Binary Firmware Structure
=========================
At this point remoteproc only supports ELF32 firmware binaries. However,
At this point remoteproc supports ELF32 and ELF64 firmware binaries. However,
it is quite expected that other platforms/devices which we'd want to
support with this framework will be based on different binary formats.

182
drivers/remoteproc/remoteproc_elf_loader.c
View File

@ -23,20 +23,29 @@
#include <linux/elf.h>
#include "remoteproc_internal.h"
#include "remoteproc_elf_helpers.h"
/**
* rproc_elf_sanity_check() - Sanity Check ELF32 firmware image
* rproc_elf_sanity_check() - Sanity Check for ELF32/ELF64 firmware image
* @rproc: the remote processor handle
* @fw: the ELF firmware image
*
* Make sure this fw image is sane.
* Make sure this fw image is sane (ie a correct ELF32/ELF64 file).
*/
int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw)
int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw)
{
const char *name = rproc->firmware;
struct device *dev = &rproc->dev;
/*
* Elf files are beginning with the same structure. Thus, to simplify
* header parsing, we can use the elf32_hdr one for both elf64 and
* elf32.
*/
struct elf32_hdr *ehdr;
u32 elf_shdr_get_size;
u64 phoff, shoff;
char class;
u16 phnum;
if (!fw) {
dev_err(dev, "failed to load %s\n", name);
@ -50,13 +59,22 @@ int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw)
ehdr = (struct elf32_hdr *)fw->data;
/* We only support ELF32 at this point */
if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
dev_err(dev, "Image is corrupted (bad magic)\n");
return -EINVAL;
}
class = ehdr->e_ident[EI_CLASS];
if (class != ELFCLASS32) {
if (class != ELFCLASS32 && class != ELFCLASS64) {
dev_err(dev, "Unsupported class: %d\n", class);
return -EINVAL;
}
if (class == ELFCLASS64 && fw->size < sizeof(struct elf64_hdr)) {
dev_err(dev, "elf64 header is too small\n");
return -EINVAL;
}
/* We assume the firmware has the same endianness as the host */
# ifdef __LITTLE_ENDIAN
if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
@ -67,28 +85,52 @@ int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw)
return -EINVAL;
}
if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) {
phoff = elf_hdr_get_e_phoff(class, fw->data);
shoff = elf_hdr_get_e_shoff(class, fw->data);
phnum = elf_hdr_get_e_phnum(class, fw->data);
elf_shdr_get_size = elf_size_of_shdr(class);
if (fw->size < shoff + elf_shdr_get_size) {
dev_err(dev, "Image is too small\n");
return -EINVAL;
}
if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
dev_err(dev, "Image is corrupted (bad magic)\n");
return -EINVAL;
}
if (ehdr->e_phnum == 0) {
if (phnum == 0) {
dev_err(dev, "No loadable segments\n");
return -EINVAL;
}
if (ehdr->e_phoff > fw->size) {
if (phoff > fw->size) {
dev_err(dev, "Firmware size is too small\n");
return -EINVAL;
}
dev_dbg(dev, "Firmware is an elf%d file\n",
class == ELFCLASS32 ? 32 : 64);
return 0;
}
EXPORT_SYMBOL(rproc_elf_sanity_check);
/**
* rproc_elf_sanity_check() - Sanity Check ELF32 firmware image
* @rproc: the remote processor handle
* @fw: the ELF32 firmware image
*
* Make sure this fw image is sane.
*/
int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw)
{
int ret = rproc_elf_sanity_check(rproc, fw);
if (ret)
return ret;
if (fw_elf_get_class(fw) == ELFCLASS32)
return 0;
return -EINVAL;
}
EXPORT_SYMBOL(rproc_elf32_sanity_check);
/**
@ -104,9 +146,7 @@ EXPORT_SYMBOL(rproc_elf32_sanity_check);
*/
u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
{
struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data;
return ehdr->e_entry;
return elf_hdr_get_e_entry(fw_elf_get_class(fw), fw->data);
}
EXPORT_SYMBOL(rproc_elf_get_boot_addr);
@ -137,53 +177,65 @@ EXPORT_SYMBOL(rproc_elf_get_boot_addr);
int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
{
struct device *dev = &rproc->dev;
struct elf32_hdr *ehdr;
struct elf32_phdr *phdr;
const void *ehdr, *phdr;
int i, ret = 0;
u16 phnum;
const u8 *elf_data = fw->data;
u8 class = fw_elf_get_class(fw);
u32 elf_phdr_get_size = elf_size_of_phdr(class);
ehdr = (struct elf32_hdr *)elf_data;
phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
ehdr = elf_data;
phnum = elf_hdr_get_e_phnum(class, ehdr);
phdr = elf_data + elf_hdr_get_e_phoff(class, ehdr);
/* go through the available ELF segments */
for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
u32 da = phdr->p_paddr;
u32 memsz = phdr->p_memsz;
u32 filesz = phdr->p_filesz;
u32 offset = phdr->p_offset;
for (i = 0; i < phnum; i++, phdr += elf_phdr_get_size) {
u64 da = elf_phdr_get_p_paddr(class, phdr);
u64 memsz = elf_phdr_get_p_memsz(class, phdr);
u64 filesz = elf_phdr_get_p_filesz(class, phdr);
u64 offset = elf_phdr_get_p_offset(class, phdr);
u32 type = elf_phdr_get_p_type(class, phdr);
void *ptr;
if (phdr->p_type != PT_LOAD)
if (type != PT_LOAD)
continue;
dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
phdr->p_type, da, memsz, filesz);
dev_dbg(dev, "phdr: type %d da 0x%llx memsz 0x%llx filesz 0x%llx\n",
type, da, memsz, filesz);
if (filesz > memsz) {
dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
dev_err(dev, "bad phdr filesz 0x%llx memsz 0x%llx\n",
filesz, memsz);
ret = -EINVAL;
break;
}
if (offset + filesz > fw->size) {
dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n",
dev_err(dev, "truncated fw: need 0x%llx avail 0x%zx\n",
offset + filesz, fw->size);
ret = -EINVAL;
break;
}
if (!rproc_u64_fit_in_size_t(memsz)) {
dev_err(dev, "size (%llx) does not fit in size_t type\n",
memsz);
ret = -EOVERFLOW;
break;
}
/* grab the kernel address for this device address */
ptr = rproc_da_to_va(rproc, da, memsz);
if (!ptr) {
dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
dev_err(dev, "bad phdr da 0x%llx mem 0x%llx\n", da,
memsz);
ret = -EINVAL;
break;
}
/* put the segment where the remote processor expects it */
if (phdr->p_filesz)
memcpy(ptr, elf_data + phdr->p_offset, filesz);
if (filesz)
memcpy(ptr, elf_data + offset, filesz);
/*
* Zero out remaining memory for this segment.
@ -200,24 +252,35 @@ int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
}
EXPORT_SYMBOL(rproc_elf_load_segments);
static struct elf32_shdr *
find_table(struct device *dev, struct elf32_hdr *ehdr, size_t fw_size)
static const void *
find_table(struct device *dev, const struct firmware *fw)
{
struct elf32_shdr *shdr;
const void *shdr, *name_table_shdr;
int i;
const char *name_table;
struct resource_table *table = NULL;
const u8 *elf_data = (void *)ehdr;
const u8 *elf_data = (void *)fw->data;
u8 class = fw_elf_get_class(fw);
size_t fw_size = fw->size;
const void *ehdr = elf_data;
u16 shnum = elf_hdr_get_e_shnum(class, ehdr);
u32 elf_shdr_get_size = elf_size_of_shdr(class);
u16 shstrndx = elf_hdr_get_e_shstrndx(class, ehdr);
/* look for the resource table and handle it */
shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff);
name_table = elf_data + shdr[ehdr->e_shstrndx].sh_offset;
/* First, get the section header according to the elf class */
shdr = elf_data + elf_hdr_get_e_shoff(class, ehdr);
/* Compute name table section header entry in shdr array */
name_table_shdr = shdr + (shstrndx * elf_shdr_get_size);
/* Finally, compute the name table section address in elf */
name_table = elf_data + elf_shdr_get_sh_offset(class, name_table_shdr);
for (i = 0; i < ehdr->e_shnum; i++, shdr++) {
u32 size = shdr->sh_size;
u32 offset = shdr->sh_offset;
for (i = 0; i < shnum; i++, shdr += elf_shdr_get_size) {
u64 size = elf_shdr_get_sh_size(class, shdr);
u64 offset = elf_shdr_get_sh_offset(class, shdr);
u32 name = elf_shdr_get_sh_name(class, shdr);
if (strcmp(name_table + shdr->sh_name, ".resource_table"))
if (strcmp(name_table + name, ".resource_table"))
continue;
table = (struct resource_table *)(elf_data + offset);
@ -270,21 +333,21 @@ find_table(struct device *dev, struct elf32_hdr *ehdr, size_t fw_size)
*/
int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw)
{
struct elf32_hdr *ehdr;
struct elf32_shdr *shdr;
const void *shdr;
struct device *dev = &rproc->dev;
struct resource_table *table = NULL;
const u8 *elf_data = fw->data;
size_t tablesz;
u8 class = fw_elf_get_class(fw);
u64 sh_offset;
ehdr = (struct elf32_hdr *)elf_data;
shdr = find_table(dev, ehdr, fw->size);
shdr = find_table(dev, fw);
if (!shdr)
return -EINVAL;
table = (struct resource_table *)(elf_data + shdr->sh_offset);
tablesz = shdr->sh_size;
sh_offset = elf_shdr_get_sh_offset(class, shdr);
table = (struct resource_table *)(elf_data + sh_offset);
tablesz = elf_shdr_get_sh_size(class, shdr);
/*
* Create a copy of the resource table. When a virtio device starts
@ -317,13 +380,24 @@ EXPORT_SYMBOL(rproc_elf_load_rsc_table);
struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc,
const struct firmware *fw)
{
struct elf32_hdr *ehdr = (struct elf32_hdr *)fw->data;
struct elf32_shdr *shdr;
const void *shdr;
u64 sh_addr, sh_size;
u8 class = fw_elf_get_class(fw);
struct device *dev = &rproc->dev;
shdr = find_table(&rproc->dev, ehdr, fw->size);
shdr = find_table(&rproc->dev, fw);
if (!shdr)
return NULL;
return rproc_da_to_va(rproc, shdr->sh_addr, shdr->sh_size);
sh_addr = elf_shdr_get_sh_addr(class, shdr);
sh_size = elf_shdr_get_sh_size(class, shdr);
if (!rproc_u64_fit_in_size_t(sh_size)) {
dev_err(dev, "size (%llx) does not fit in size_t type\n",
sh_size);
return NULL;
}
return rproc_da_to_va(rproc, sh_addr, sh_size);
}
EXPORT_SYMBOL(rproc_elf_find_loaded_rsc_table);

10
drivers/remoteproc/remoteproc_internal.h
View File

@ -55,6 +55,7 @@ phys_addr_t rproc_va_to_pa(void *cpu_addr);
int rproc_trigger_recovery(struct rproc *rproc);
int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw);
int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw);
u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw);
int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw);
int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw);
@ -119,4 +120,13 @@ struct resource_table *rproc_find_loaded_rsc_table(struct rproc *rproc,
return NULL;
}
static inline
bool rproc_u64_fit_in_size_t(u64 val)
{
if (sizeof(size_t) == sizeof(u64))
return true;
return (val <= (size_t) -1);
}
#endif /* REMOTEPROC_INTERNAL_H */