mirror of https://gitee.com/openkylin/linux.git
407 lines
11 KiB
C
407 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Remote Processor Framework Elf loader
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Copyright (C) 2011 Google, Inc.
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*
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* Ohad Ben-Cohen <ohad@wizery.com>
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* Brian Swetland <swetland@google.com>
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* Mark Grosen <mgrosen@ti.com>
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* Fernando Guzman Lugo <fernando.lugo@ti.com>
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* Suman Anna <s-anna@ti.com>
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* Robert Tivy <rtivy@ti.com>
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* Armando Uribe De Leon <x0095078@ti.com>
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* Sjur Brændeland <sjur.brandeland@stericsson.com>
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*/
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#define pr_fmt(fmt) "%s: " fmt, __func__
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#include <linux/module.h>
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#include <linux/firmware.h>
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#include <linux/remoteproc.h>
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#include <linux/elf.h>
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#include "remoteproc_internal.h"
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#include "remoteproc_elf_helpers.h"
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/**
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* rproc_elf_sanity_check() - Sanity Check for ELF32/ELF64 firmware image
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* @rproc: the remote processor handle
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* @fw: the ELF firmware image
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*
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* Make sure this fw image is sane (ie a correct ELF32/ELF64 file).
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*/
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int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw)
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{
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const char *name = rproc->firmware;
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struct device *dev = &rproc->dev;
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/*
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* Elf files are beginning with the same structure. Thus, to simplify
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* header parsing, we can use the elf32_hdr one for both elf64 and
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* elf32.
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*/
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struct elf32_hdr *ehdr;
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u32 elf_shdr_get_size;
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u64 phoff, shoff;
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char class;
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u16 phnum;
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if (!fw) {
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dev_err(dev, "failed to load %s\n", name);
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return -EINVAL;
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}
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if (fw->size < sizeof(struct elf32_hdr)) {
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dev_err(dev, "Image is too small\n");
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return -EINVAL;
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}
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ehdr = (struct elf32_hdr *)fw->data;
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if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
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dev_err(dev, "Image is corrupted (bad magic)\n");
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return -EINVAL;
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}
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class = ehdr->e_ident[EI_CLASS];
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if (class != ELFCLASS32 && class != ELFCLASS64) {
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dev_err(dev, "Unsupported class: %d\n", class);
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return -EINVAL;
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}
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if (class == ELFCLASS64 && fw->size < sizeof(struct elf64_hdr)) {
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dev_err(dev, "elf64 header is too small\n");
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return -EINVAL;
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}
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/* We assume the firmware has the same endianness as the host */
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# ifdef __LITTLE_ENDIAN
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if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
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# else /* BIG ENDIAN */
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if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) {
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# endif
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dev_err(dev, "Unsupported firmware endianness\n");
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return -EINVAL;
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}
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phoff = elf_hdr_get_e_phoff(class, fw->data);
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shoff = elf_hdr_get_e_shoff(class, fw->data);
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phnum = elf_hdr_get_e_phnum(class, fw->data);
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elf_shdr_get_size = elf_size_of_shdr(class);
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if (fw->size < shoff + elf_shdr_get_size) {
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dev_err(dev, "Image is too small\n");
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return -EINVAL;
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}
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if (phnum == 0) {
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dev_err(dev, "No loadable segments\n");
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return -EINVAL;
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}
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if (phoff > fw->size) {
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dev_err(dev, "Firmware size is too small\n");
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return -EINVAL;
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}
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dev_dbg(dev, "Firmware is an elf%d file\n",
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class == ELFCLASS32 ? 32 : 64);
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return 0;
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}
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EXPORT_SYMBOL(rproc_elf_sanity_check);
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/**
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* rproc_elf_sanity_check() - Sanity Check ELF32 firmware image
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* @rproc: the remote processor handle
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* @fw: the ELF32 firmware image
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*
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* Make sure this fw image is sane.
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*/
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int rproc_elf32_sanity_check(struct rproc *rproc, const struct firmware *fw)
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{
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int ret = rproc_elf_sanity_check(rproc, fw);
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if (ret)
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return ret;
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if (fw_elf_get_class(fw) == ELFCLASS32)
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return 0;
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return -EINVAL;
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}
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EXPORT_SYMBOL(rproc_elf32_sanity_check);
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/**
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* rproc_elf_get_boot_addr() - Get rproc's boot address.
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* @rproc: the remote processor handle
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* @fw: the ELF firmware image
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*
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* This function returns the entry point address of the ELF
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* image.
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*
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* Note that the boot address is not a configurable property of all remote
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* processors. Some will always boot at a specific hard-coded address.
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*/
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u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw)
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{
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return elf_hdr_get_e_entry(fw_elf_get_class(fw), fw->data);
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}
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EXPORT_SYMBOL(rproc_elf_get_boot_addr);
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/**
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* rproc_elf_load_segments() - load firmware segments to memory
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* @rproc: remote processor which will be booted using these fw segments
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* @fw: the ELF firmware image
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*
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* This function loads the firmware segments to memory, where the remote
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* processor expects them.
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*
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* Some remote processors will expect their code and data to be placed
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* in specific device addresses, and can't have them dynamically assigned.
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*
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* We currently support only those kind of remote processors, and expect
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* the program header's paddr member to contain those addresses. We then go
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* through the physically contiguous "carveout" memory regions which we
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* allocated (and mapped) earlier on behalf of the remote processor,
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* and "translate" device address to kernel addresses, so we can copy the
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* segments where they are expected.
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*
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* Currently we only support remote processors that required carveout
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* allocations and got them mapped onto their iommus. Some processors
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* might be different: they might not have iommus, and would prefer to
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* directly allocate memory for every segment/resource. This is not yet
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* supported, though.
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*/
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int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
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{
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struct device *dev = &rproc->dev;
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const void *ehdr, *phdr;
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int i, ret = 0;
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u16 phnum;
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const u8 *elf_data = fw->data;
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u8 class = fw_elf_get_class(fw);
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u32 elf_phdr_get_size = elf_size_of_phdr(class);
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ehdr = elf_data;
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phnum = elf_hdr_get_e_phnum(class, ehdr);
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phdr = elf_data + elf_hdr_get_e_phoff(class, ehdr);
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/* go through the available ELF segments */
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for (i = 0; i < phnum; i++, phdr += elf_phdr_get_size) {
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u64 da = elf_phdr_get_p_paddr(class, phdr);
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u64 memsz = elf_phdr_get_p_memsz(class, phdr);
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u64 filesz = elf_phdr_get_p_filesz(class, phdr);
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u64 offset = elf_phdr_get_p_offset(class, phdr);
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u32 type = elf_phdr_get_p_type(class, phdr);
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void *ptr;
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if (type != PT_LOAD)
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continue;
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dev_dbg(dev, "phdr: type %d da 0x%llx memsz 0x%llx filesz 0x%llx\n",
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type, da, memsz, filesz);
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if (filesz > memsz) {
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dev_err(dev, "bad phdr filesz 0x%llx memsz 0x%llx\n",
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filesz, memsz);
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ret = -EINVAL;
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break;
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}
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if (offset + filesz > fw->size) {
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dev_err(dev, "truncated fw: need 0x%llx avail 0x%zx\n",
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offset + filesz, fw->size);
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ret = -EINVAL;
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break;
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}
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if (!rproc_u64_fit_in_size_t(memsz)) {
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dev_err(dev, "size (%llx) does not fit in size_t type\n",
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memsz);
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ret = -EOVERFLOW;
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break;
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}
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/* grab the kernel address for this device address */
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ptr = rproc_da_to_va(rproc, da, memsz);
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if (!ptr) {
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dev_err(dev, "bad phdr da 0x%llx mem 0x%llx\n", da,
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memsz);
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ret = -EINVAL;
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break;
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}
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/* put the segment where the remote processor expects it */
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if (filesz)
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memcpy(ptr, elf_data + offset, filesz);
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/*
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* Zero out remaining memory for this segment.
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*
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* This isn't strictly required since dma_alloc_coherent already
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* did this for us. albeit harmless, we may consider removing
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* this.
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*/
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if (memsz > filesz)
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memset(ptr + filesz, 0, memsz - filesz);
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}
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if (ret == 0)
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rproc->elf_class = class;
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return ret;
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}
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EXPORT_SYMBOL(rproc_elf_load_segments);
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static const void *
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find_table(struct device *dev, const struct firmware *fw)
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{
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const void *shdr, *name_table_shdr;
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int i;
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const char *name_table;
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struct resource_table *table = NULL;
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const u8 *elf_data = (void *)fw->data;
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u8 class = fw_elf_get_class(fw);
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size_t fw_size = fw->size;
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const void *ehdr = elf_data;
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u16 shnum = elf_hdr_get_e_shnum(class, ehdr);
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u32 elf_shdr_get_size = elf_size_of_shdr(class);
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u16 shstrndx = elf_hdr_get_e_shstrndx(class, ehdr);
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/* look for the resource table and handle it */
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/* First, get the section header according to the elf class */
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shdr = elf_data + elf_hdr_get_e_shoff(class, ehdr);
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/* Compute name table section header entry in shdr array */
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name_table_shdr = shdr + (shstrndx * elf_shdr_get_size);
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/* Finally, compute the name table section address in elf */
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name_table = elf_data + elf_shdr_get_sh_offset(class, name_table_shdr);
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for (i = 0; i < shnum; i++, shdr += elf_shdr_get_size) {
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u64 size = elf_shdr_get_sh_size(class, shdr);
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u64 offset = elf_shdr_get_sh_offset(class, shdr);
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u32 name = elf_shdr_get_sh_name(class, shdr);
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if (strcmp(name_table + name, ".resource_table"))
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continue;
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table = (struct resource_table *)(elf_data + offset);
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/* make sure we have the entire table */
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if (offset + size > fw_size || offset + size < size) {
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dev_err(dev, "resource table truncated\n");
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return NULL;
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}
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/* make sure table has at least the header */
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if (sizeof(struct resource_table) > size) {
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dev_err(dev, "header-less resource table\n");
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return NULL;
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}
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/* we don't support any version beyond the first */
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if (table->ver != 1) {
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dev_err(dev, "unsupported fw ver: %d\n", table->ver);
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return NULL;
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}
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/* make sure reserved bytes are zeroes */
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if (table->reserved[0] || table->reserved[1]) {
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dev_err(dev, "non zero reserved bytes\n");
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return NULL;
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}
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/* make sure the offsets array isn't truncated */
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if (struct_size(table, offset, table->num) > size) {
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dev_err(dev, "resource table incomplete\n");
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return NULL;
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}
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return shdr;
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}
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return NULL;
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}
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/**
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* rproc_elf_load_rsc_table() - load the resource table
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* @rproc: the rproc handle
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* @fw: the ELF firmware image
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*
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* This function finds the resource table inside the remote processor's
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* firmware, load it into the @cached_table and update @table_ptr.
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*
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* Return: 0 on success, negative errno on failure.
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*/
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int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw)
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{
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const void *shdr;
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struct device *dev = &rproc->dev;
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struct resource_table *table = NULL;
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const u8 *elf_data = fw->data;
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size_t tablesz;
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u8 class = fw_elf_get_class(fw);
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u64 sh_offset;
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shdr = find_table(dev, fw);
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if (!shdr)
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return -EINVAL;
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sh_offset = elf_shdr_get_sh_offset(class, shdr);
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table = (struct resource_table *)(elf_data + sh_offset);
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tablesz = elf_shdr_get_sh_size(class, shdr);
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/*
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* Create a copy of the resource table. When a virtio device starts
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* and calls vring_new_virtqueue() the address of the allocated vring
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* will be stored in the cached_table. Before the device is started,
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* cached_table will be copied into device memory.
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*/
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rproc->cached_table = kmemdup(table, tablesz, GFP_KERNEL);
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if (!rproc->cached_table)
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return -ENOMEM;
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rproc->table_ptr = rproc->cached_table;
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rproc->table_sz = tablesz;
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return 0;
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}
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EXPORT_SYMBOL(rproc_elf_load_rsc_table);
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/**
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* rproc_elf_find_loaded_rsc_table() - find the loaded resource table
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* @rproc: the rproc handle
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* @fw: the ELF firmware image
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*
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* This function finds the location of the loaded resource table. Don't
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* call this function if the table wasn't loaded yet - it's a bug if you do.
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*
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* Returns the pointer to the resource table if it is found or NULL otherwise.
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* If the table wasn't loaded yet the result is unspecified.
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*/
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struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc,
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const struct firmware *fw)
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{
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const void *shdr;
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u64 sh_addr, sh_size;
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u8 class = fw_elf_get_class(fw);
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struct device *dev = &rproc->dev;
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shdr = find_table(&rproc->dev, fw);
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if (!shdr)
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return NULL;
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sh_addr = elf_shdr_get_sh_addr(class, shdr);
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sh_size = elf_shdr_get_sh_size(class, shdr);
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if (!rproc_u64_fit_in_size_t(sh_size)) {
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dev_err(dev, "size (%llx) does not fit in size_t type\n",
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sh_size);
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return NULL;
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}
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return rproc_da_to_va(rproc, sh_addr, sh_size);
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}
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EXPORT_SYMBOL(rproc_elf_find_loaded_rsc_table);
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