diff options
Diffstat (limited to 'resources/cbfstool')
| -rw-r--r-- | resources/cbfstool/patch/COPYING | 2 | ||||
| -rw-r--r-- | resources/cbfstool/patch/rmodule.c | 655 |
2 files changed, 0 insertions, 657 deletions
diff --git a/resources/cbfstool/patch/COPYING b/resources/cbfstool/patch/COPYING deleted file mode 100644 index c4c97fcd..00000000 --- a/resources/cbfstool/patch/COPYING +++ /dev/null @@ -1,2 +0,0 @@ -rmodule.c is from and part of the coreboot project. -Check coreboot's copyright information to see what conditions apply. diff --git a/resources/cbfstool/patch/rmodule.c b/resources/cbfstool/patch/rmodule.c deleted file mode 100644 index 3bee1e02..00000000 --- a/resources/cbfstool/patch/rmodule.c +++ /dev/null @@ -1,655 +0,0 @@ -/* - ;* Copyright (C) 2014 Google, Inc. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; version 2 of the License. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA - */ - -#include <stdio.h> -#include <stdlib.h> -#include <string.h> - -#include "elfparsing.h" -#include "rmodule.h" -#include "rmodule-defs.h" - -struct rmod_context; - -struct arch_ops { - int arch; - /* Determine if relocation is a valid type for the architecture. */ - int (*valid_type)(struct rmod_context *ctx, Elf64_Rela *rel); - /* Determine if relocation should be emitted. */ - int (*should_emit)(struct rmod_context *ctx, Elf64_Rela *rel); -}; - -struct rmod_context { - /* Ops to process relocations. */ - struct arch_ops *ops; - - /* endian conversion ops */ - struct xdr *xdr; - - /* Parsed ELF sturcture. */ - struct parsed_elf pelf; - /* Program segment. */ - Elf64_Phdr *phdr; - - /* Collection of relocation addresses fixup in the module. */ - Elf64_Xword nrelocs; - Elf64_Addr *emitted_relocs; - - /* The following fields are addresses within the linked program. */ - Elf64_Addr link_addr; - Elf64_Addr entry; - Elf64_Addr parameters_begin; - Elf64_Addr parameters_end; - Elf64_Addr bss_begin; - Elf64_Addr bss_end; - Elf64_Xword size; -}; - -/* - * Architecture specific support operations. - */ -static int valid_reloc_386(struct rmod_context *ctx, Elf64_Rela *rel) -{ - int type; - - type = ELF64_R_TYPE(rel->r_info); - - /* Only these 2 relocations are expected to be found. */ - return (type == R_386_32 || type == R_386_PC32); -} - -static int should_emit_386(struct rmod_context *ctx, Elf64_Rela *rel) -{ - int type; - - type = ELF64_R_TYPE(rel->r_info); - - /* R_386_32 relocations are absolute. Must emit these. */ - return (type == R_386_32); -} - -static int valid_reloc_arm(struct rmod_context *ctx, Elf64_Rela *rel) -{ - int type; - - type = ELF64_R_TYPE(rel->r_info); - - /* Only these 3 relocations are expected to be found. */ - return (type == R_ARM_ABS32 || type == R_ARM_THM_PC22 || - type == R_ARM_THM_JUMP24); -} - -static int should_emit_arm(struct rmod_context *ctx, Elf64_Rela *rel) -{ - int type; - - type = ELF64_R_TYPE(rel->r_info); - - /* R_ARM_ABS32 relocations are absolute. Must emit these. */ - return (type == R_ARM_ABS32); -} - -static struct arch_ops reloc_ops[] = { - { - .arch = EM_386, - .valid_type = valid_reloc_386, - .should_emit = should_emit_386, - }, - { - .arch = EM_ARM, - .valid_type = valid_reloc_arm, - .should_emit = should_emit_arm, - }, -}; - -/* - * Relocation processing loops. - */ - -static int for_each_reloc(struct rmod_context *ctx, int do_emit) -{ - Elf64_Half i; - struct parsed_elf *pelf = &ctx->pelf; - - for (i = 0; i < pelf->ehdr.e_shnum; i++) { - Elf64_Shdr *shdr; - Elf64_Rela *relocs; - Elf64_Xword nrelocs; - Elf64_Xword j; - - relocs = pelf->relocs[i]; - - /* No relocations in this section. */ - if (relocs == NULL) - continue; - - shdr = &pelf->shdr[i]; - nrelocs = shdr->sh_size / shdr->sh_entsize; - - for (j = 0; j < nrelocs; j++) { - Elf64_Rela *r = &relocs[j]; - - if (!ctx->ops->valid_type(ctx, r)) { - ERROR("Invalid reloc type: %u\n", - (unsigned int)ELF64_R_TYPE(r->r_info)); - return -1; - } - - if (ctx->ops->should_emit(ctx, r)) { - int n = ctx->nrelocs; - if (do_emit) - ctx->emitted_relocs[n] = r->r_offset; - ctx->nrelocs++; - } - } - } - - return 0; -} - -static int find_program_segment(struct rmod_context *ctx) -{ - int i; - int nsegments; - struct parsed_elf *pelf; - Elf64_Phdr *phdr; - - pelf = &ctx->pelf; - - /* There should only be a single loadable segment. */ - nsegments = 0; - for (i = 0; i < pelf->ehdr.e_phnum; i++) { - if (pelf->phdr[i].p_type != PT_LOAD) - continue; - phdr = &pelf->phdr[i]; - nsegments++; - } - - if (nsegments != 1) { - ERROR("Unexepcted number of loadable segments: %d.\n", - nsegments); - return -1; - } - - INFO("Segment at 0x%0llx, file size 0x%0llx, mem size 0x%0llx.\n", - (long long)phdr->p_vaddr, (long long)phdr->p_filesz, - (long long)phdr->p_memsz); - - ctx->phdr = phdr; - - return 0; -} - -static int -filter_relocation_sections(struct rmod_context *ctx) -{ - int i; - const char *shstrtab; - struct parsed_elf *pelf; - const Elf64_Phdr *phdr; - - pelf = &ctx->pelf; - phdr = ctx->phdr; - shstrtab = buffer_get(pelf->strtabs[pelf->ehdr.e_shstrndx]); - - /* - * Find all relocation sections that contain relocation entries - * for sections that fall within the bounds of the segment. For - * easier processing the pointer to the relocation array for the - * sections that don't fall within the loadable program are NULL'd - * out. - */ - for (i = 0; i < pelf->ehdr.e_shnum; i++) { - Elf64_Shdr *shdr; - Elf64_Word sh_info; - const char *section_name; - - shdr = &pelf->shdr[i]; - - /* Ignore non-relocation sections. */ - if (shdr->sh_type != SHT_RELA && shdr->sh_type != SHT_REL) - continue; - - /* Obtain section which relocations apply. */ - sh_info = shdr->sh_info; - shdr = &pelf->shdr[sh_info]; - - section_name = &shstrtab[shdr->sh_name]; - DEBUG("Relocation section found for '%s' section.\n", - section_name); - - /* Do not process relocations for debug sections. */ - if (strstr(section_name, ".debug") != NULL) { - pelf->relocs[i] = NULL; - continue; - } - - /* - * If relocations apply to a non program section ignore the - * relocations for future processing. - */ - if (shdr->sh_type != SHT_PROGBITS) { - pelf->relocs[i] = NULL; - continue; - } - - if (shdr->sh_addr < phdr->p_vaddr || - ((shdr->sh_addr + shdr->sh_size) > - (phdr->p_vaddr + phdr->p_memsz))) { - ERROR("Relocations being applied to section %d not " - "within segment region.\n", sh_info); - return -1; - } - } - - return 0; -} - -static int vaddr_cmp(const void *a, const void *b) -{ - const Elf64_Addr *pa = a; - const Elf64_Addr *pb = b; - - if (*pa < *pb) - return -1; - if (*pa > *pb) - return 1; - return 0; -} - -static int collect_relocations(struct rmod_context *ctx) -{ - int nrelocs; - - /* - * The relocs array in the pelf should only contain relocations that - * apply to the program. Count the number relocations. Then collect - * them into the allocated buffer. - */ - if (for_each_reloc(ctx, 0)) - return -1; - - nrelocs = ctx->nrelocs; - INFO("%d relocations to be emitted.\n", nrelocs); - if (!nrelocs) - return 0; - - /* Reset the counter for indexing into the array. */ - ctx->nrelocs = 0; - ctx->emitted_relocs = calloc(nrelocs, sizeof(Elf64_Addr)); - /* Write out the relocations into the emitted_relocs array. */ - if (for_each_reloc(ctx, 1)) - return -1; - - if (ctx->nrelocs != nrelocs) { - ERROR("Mismatch counted and emitted relocations: %zu vs %zu.\n", - (size_t)nrelocs, (size_t)ctx->nrelocs); - return -1; - } - - /* Sort the relocations by their address. */ - qsort(ctx->emitted_relocs, nrelocs, sizeof(Elf64_Addr), vaddr_cmp); - - return 0; -} - -static int -populate_sym(struct rmod_context *ctx, const char *sym_name, Elf64_Addr *addr, - int nsyms, const char *strtab) -{ - int i; - Elf64_Sym *syms; - - syms = ctx->pelf.syms; - - for (i = 0; i < nsyms; i++) { - if (syms[i].st_name == 0) - continue; - if (strcmp(sym_name, &strtab[syms[i].st_name])) - continue; - DEBUG("%s -> 0x%llx\n", sym_name, (long long)syms[i].st_value); - *addr = syms[i].st_value; - return 0; - } - ERROR("symbol '%s' not found.\n", sym_name); - return -1; -} - -static int populate_program_info(struct rmod_context *ctx) -{ - int i; - const char *strtab; - struct parsed_elf *pelf; - Elf64_Ehdr *ehdr; - int nsyms; - - pelf = &ctx->pelf; - ehdr = &pelf->ehdr; - - /* Obtain the string table. */ - strtab = NULL; - for (i = 0; i < ehdr->e_shnum; i++) { - if (ctx->pelf.strtabs[i] == NULL) - continue; - /* Don't use the section headers' string table. */ - if (i == ehdr->e_shstrndx) - continue; - strtab = buffer_get(ctx->pelf.strtabs[i]); - break; - } - - if (strtab == NULL) { - ERROR("No string table found.\n"); - return -1; - } - - /* Determine number of symbols. */ - nsyms = 0; - for (i = 0; i < ehdr->e_shnum; i++) { - if (pelf->shdr[i].sh_type != SHT_SYMTAB) - continue; - - nsyms = pelf->shdr[i].sh_size / pelf->shdr[i].sh_entsize; - break; - } - - if (populate_sym(ctx, "_module_params_begin", &ctx->parameters_begin, - nsyms, strtab)) - return -1; - - if (populate_sym(ctx, "_module_params_end", &ctx->parameters_end, - nsyms, strtab)) - return -1; - - if (populate_sym(ctx, "_bss", &ctx->bss_begin, nsyms, strtab)) - return -1; - - if (populate_sym(ctx, "_ebss", &ctx->bss_end, nsyms, strtab)) - return -1; - - if (populate_sym(ctx, "__rmodule_entry", &ctx->entry, nsyms, strtab)) - return -1; - - /* Link address is the virtual address of the program segment. */ - ctx->link_addr = ctx->phdr->p_vaddr; - - /* The program size is the memsz of the program segment. */ - ctx->size = ctx->phdr->p_memsz; - - return 0; -} - -static int -add_section(struct elf_writer *ew, struct buffer *data, const char *name, - Elf64_Addr addr, Elf64_Word size) -{ - Elf64_Shdr shdr; - int ret; - - memset(&shdr, 0, sizeof(shdr)); - if (data != NULL) { - shdr.sh_type = SHT_PROGBITS; - shdr.sh_flags = SHF_ALLOC | SHF_WRITE | SHF_EXECINSTR; - } else { - shdr.sh_type = SHT_NOBITS; - shdr.sh_flags = SHF_ALLOC; - } - shdr.sh_addr = addr; - shdr.sh_offset = addr; - shdr.sh_size = size; - - ret = elf_writer_add_section(ew, &shdr, data, name); - - if (ret) - ERROR("Could not add '%s' section.\n", name); - - return ret; -} - -static int -write_elf(const struct rmod_context *ctx, const struct buffer *in, - struct buffer *out) -{ - int i; - int ret; - int bit64; - size_t loc; - size_t rmod_data_size; - struct elf_writer *ew; - struct buffer rmod_data; - struct buffer rmod_header; - struct buffer program; - struct buffer relocs; - Elf64_Xword total_size; - Elf64_Addr addr; - Elf64_Ehdr ehdr; - - bit64 = ctx->pelf.ehdr.e_ident[EI_CLASS] == ELFCLASS64; - - /* - * 3 sections will be added to the ELF file. - * +------------------+ - * | rmodule header | - * +------------------+ - * | program | - * +------------------+ - * | relocations | - * +------------------+ - */ - - /* Create buffer for header and relocations. */ - rmod_data_size = sizeof(struct rmodule_header); - if (bit64) - rmod_data_size += ctx->nrelocs * sizeof(Elf64_Addr); - else - rmod_data_size += ctx->nrelocs * sizeof(Elf32_Addr); - - if (buffer_create(&rmod_data, rmod_data_size, "rmod")) - return -1; - - buffer_splice(&rmod_header, &rmod_data, - 0, sizeof(struct rmodule_header)); - buffer_clone(&relocs, &rmod_data); - buffer_seek(&relocs, sizeof(struct rmodule_header)); - - /* Reset current location. */ - buffer_set_size(&rmod_header, 0); - buffer_set_size(&relocs, 0); - - /* Program contents. */ - buffer_splice(&program, in, ctx->phdr->p_offset, ctx->phdr->p_filesz); - - /* Create ELF writer with modified entry point. */ - memcpy(&ehdr, &ctx->pelf.ehdr, sizeof(ehdr)); - ehdr.e_entry = ctx->entry; - ew = elf_writer_init(&ehdr); - - if (ew == NULL) { - ERROR("Failed to create ELF writer.\n"); - buffer_delete(&rmod_data); - return -1; - } - - /* Write out rmodule_header. */ - ctx->xdr->put16(&rmod_header, RMODULE_MAGIC); - ctx->xdr->put8(&rmod_header, RMODULE_VERSION_1); - ctx->xdr->put8(&rmod_header, 0); - /* payload_begin_offset */ - loc = sizeof(struct rmodule_header); - ctx->xdr->put32(&rmod_header, loc); - /* payload_end_offset */ - loc += ctx->phdr->p_filesz; - ctx->xdr->put32(&rmod_header, loc); - /* relocations_begin_offset */ - ctx->xdr->put32(&rmod_header, loc); - /* relocations_end_offset */ - if (bit64) - loc += ctx->nrelocs * sizeof(Elf64_Addr); - else - loc += ctx->nrelocs * sizeof(Elf32_Addr); - ctx->xdr->put32(&rmod_header, loc); - /* module_link_start_address */ - ctx->xdr->put32(&rmod_header, ctx->link_addr); - /* module_program_size */ - ctx->xdr->put32(&rmod_header, ctx->size); - /* module_entry_point */ - ctx->xdr->put32(&rmod_header, ctx->entry); - /* parameters_begin */ - ctx->xdr->put32(&rmod_header, ctx->parameters_begin); - /* parameters_end */ - ctx->xdr->put32(&rmod_header, ctx->parameters_end); - /* bss_begin */ - ctx->xdr->put32(&rmod_header, ctx->bss_begin); - /* bss_end */ - ctx->xdr->put32(&rmod_header, ctx->bss_end); - /* padding[4] */ - ctx->xdr->put32(&rmod_header, 0); - ctx->xdr->put32(&rmod_header, 0); - ctx->xdr->put32(&rmod_header, 0); - ctx->xdr->put32(&rmod_header, 0); - - /* Write the relocations. */ - for (i = 0; i < ctx->nrelocs; i++) { - if (bit64) - ctx->xdr->put64(&relocs, ctx->emitted_relocs[i]); - else - ctx->xdr->put32(&relocs, ctx->emitted_relocs[i]); - } - - total_size = 0; - addr = 0; - - /* - * There are 2 cases to deal with. The program has a large NOBITS - * section and the relocations can fit entirely within occupied memory - * region for the program. The other is that the relocations increase - * the memory footprint of the program if it was loaded directly into - * the region it would run. The rmdoule header is a fixed cost that - * is considered a part of the program. - */ - total_size += buffer_size(&rmod_header); - if (buffer_size(&relocs) + ctx->phdr->p_filesz > ctx->phdr->p_memsz) { - total_size += buffer_size(&relocs); - total_size += ctx->phdr->p_filesz; - } else { - total_size += ctx->phdr->p_memsz; - } - - ret = add_section(ew, &rmod_header, ".header", addr, - buffer_size(&rmod_header)); - if (ret < 0) - goto out; - addr += buffer_size(&rmod_header); - - ret = add_section(ew, &program, ".program", addr, ctx->phdr->p_filesz); - if (ret < 0) - goto out; - addr += ctx->phdr->p_filesz; - - if (ctx->nrelocs) { - ret = add_section(ew, &relocs, ".relocs", addr, - buffer_size(&relocs)); - if (ret < 0) - goto out; - addr += buffer_size(&relocs); - } - - if (total_size != addr) { - ret = add_section(ew, NULL, ".empty", addr, total_size - addr); - if (ret < 0) - goto out; - } - - /* - * Ensure last section has a memory usage that meets the required - * total size of the program in memory. - */ - - ret = elf_writer_serialize(ew, out); - if (ret < 0) - ERROR("Failed to serialize ELF to buffer.\n"); - -out: - buffer_delete(&rmod_data); - elf_writer_destroy(ew); - - return ret; -} - -int rmodule_create(const struct buffer *elfin, struct buffer *elfout) -{ - struct rmod_context ctx; - struct parsed_elf *pelf; - int i; - int ret; - - ret = -1; - memset(&ctx, 0, sizeof(ctx)); - pelf = &ctx.pelf; - - if (parse_elf(elfin, pelf, ELF_PARSE_ALL)) { - ERROR("Couldn't parse ELF!\n"); - return -1; - } - - /* Only allow executables to be turned into rmodules. */ - if (pelf->ehdr.e_type != ET_EXEC) { - ERROR("ELF is not an executable: %u.\n", pelf->ehdr.e_type); - goto out; - } - - /* Determine if architecture is supported. */ - for (i = 0; i < ARRAY_SIZE(reloc_ops); i++) { - if (reloc_ops[i].arch == pelf->ehdr.e_machine) { - ctx.ops = &reloc_ops[i]; - break; - } - } - - if (ctx.ops == NULL) { - ERROR("ELF is unsupported arch: %u.\n", pelf->ehdr.e_machine); - goto out; - } - - /* Set the endian ops. */ - if (ctx.pelf.ehdr.e_ident[EI_DATA] == ELFDATA2MSB) - ctx.xdr = &xdr_be; - else - ctx.xdr = &xdr_le; - - if (find_program_segment(&ctx)) - goto out; - - if (filter_relocation_sections(&ctx)) - goto out; - - if (collect_relocations(&ctx)) - goto out; - - if (populate_program_info(&ctx)) - goto out; - - if (write_elf(&ctx, elfin, elfout)) - goto out; - - ret = 0; - -out: - free(ctx.emitted_relocs); - parsed_elf_destroy(pelf); - return ret; -} |