289 lines
7.7 KiB
C
289 lines
7.7 KiB
C
/*
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* Copyright 2004-2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later
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*/
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#define pr_fmt(fmt) "module %s: " fmt, mod->name
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#include <linux/moduleloader.h>
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#include <linux/elf.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <asm/dma.h>
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#include <asm/cacheflush.h>
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#include <asm/uaccess.h>
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/* Transfer the section to the L1 memory */
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int
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module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
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char *secstrings, struct module *mod)
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{
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/*
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* XXX: sechdrs are vmalloced in kernel/module.c
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* and would be vfreed just after module is loaded,
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* so we hack to keep the only information we needed
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* in mod->arch to correctly free L1 I/D sram later.
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* NOTE: this breaks the semantic of mod->arch structure.
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*/
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Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
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void *dest;
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for (s = sechdrs; s < sechdrs_end; ++s) {
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const char *shname = secstrings + s->sh_name;
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if (s->sh_size == 0)
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continue;
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if (!strcmp(".l1.text", shname) ||
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(!strcmp(".text", shname) &&
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(hdr->e_flags & EF_BFIN_CODE_IN_L1))) {
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dest = l1_inst_sram_alloc(s->sh_size);
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mod->arch.text_l1 = dest;
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if (dest == NULL) {
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pr_err("L1 inst memory allocation failed\n");
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return -1;
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}
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dma_memcpy(dest, (void *)s->sh_addr, s->sh_size);
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} else if (!strcmp(".l1.data", shname) ||
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(!strcmp(".data", shname) &&
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(hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
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dest = l1_data_sram_alloc(s->sh_size);
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mod->arch.data_a_l1 = dest;
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if (dest == NULL) {
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pr_err("L1 data memory allocation failed\n");
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return -1;
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}
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memcpy(dest, (void *)s->sh_addr, s->sh_size);
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} else if (!strcmp(".l1.bss", shname) ||
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(!strcmp(".bss", shname) &&
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(hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
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dest = l1_data_sram_zalloc(s->sh_size);
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mod->arch.bss_a_l1 = dest;
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if (dest == NULL) {
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pr_err("L1 data memory allocation failed\n");
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return -1;
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}
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} else if (!strcmp(".l1.data.B", shname)) {
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dest = l1_data_B_sram_alloc(s->sh_size);
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mod->arch.data_b_l1 = dest;
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if (dest == NULL) {
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pr_err("L1 data memory allocation failed\n");
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return -1;
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}
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memcpy(dest, (void *)s->sh_addr, s->sh_size);
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} else if (!strcmp(".l1.bss.B", shname)) {
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dest = l1_data_B_sram_alloc(s->sh_size);
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mod->arch.bss_b_l1 = dest;
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if (dest == NULL) {
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pr_err("L1 data memory allocation failed\n");
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return -1;
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}
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memset(dest, 0, s->sh_size);
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} else if (!strcmp(".l2.text", shname) ||
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(!strcmp(".text", shname) &&
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(hdr->e_flags & EF_BFIN_CODE_IN_L2))) {
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dest = l2_sram_alloc(s->sh_size);
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mod->arch.text_l2 = dest;
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if (dest == NULL) {
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pr_err("L2 SRAM allocation failed\n");
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return -1;
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}
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memcpy(dest, (void *)s->sh_addr, s->sh_size);
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} else if (!strcmp(".l2.data", shname) ||
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(!strcmp(".data", shname) &&
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(hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
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dest = l2_sram_alloc(s->sh_size);
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mod->arch.data_l2 = dest;
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if (dest == NULL) {
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pr_err("L2 SRAM allocation failed\n");
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return -1;
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}
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memcpy(dest, (void *)s->sh_addr, s->sh_size);
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} else if (!strcmp(".l2.bss", shname) ||
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(!strcmp(".bss", shname) &&
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(hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
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dest = l2_sram_zalloc(s->sh_size);
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mod->arch.bss_l2 = dest;
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if (dest == NULL) {
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pr_err("L2 SRAM allocation failed\n");
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return -1;
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}
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} else
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continue;
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s->sh_flags &= ~SHF_ALLOC;
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s->sh_addr = (unsigned long)dest;
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}
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return 0;
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}
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/*************************************************************************/
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/* FUNCTION : apply_relocate_add */
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/* ABSTRACT : Blackfin specific relocation handling for the loadable */
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/* modules. Modules are expected to be .o files. */
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/* Arithmetic relocations are handled. */
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/* We do not expect LSETUP to be split and hence is not */
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/* handled. */
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/* R_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the */
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/* gas does not generate it. */
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/*************************************************************************/
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int
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apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relsec,
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struct module *mod)
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{
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unsigned int i;
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Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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unsigned long location, value, size;
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pr_debug("applying relocate section %u to %u\n",
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relsec, sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* This is where to make the change */
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location = sechdrs[sechdrs[relsec].sh_info].sh_addr +
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rel[i].r_offset;
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/* This is the symbol it is referring to. Note that all
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undefined symbols have been resolved. */
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sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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value = sym->st_value;
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value += rel[i].r_addend;
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#ifdef CONFIG_SMP
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if (location >= COREB_L1_DATA_A_START) {
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pr_err("cannot relocate in L1: %u (SMP kernel)\n",
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ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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}
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#endif
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pr_debug("location is %lx, value is %lx type is %d\n",
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location, value, ELF32_R_TYPE(rel[i].r_info));
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_BFIN_HUIMM16:
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value >>= 16;
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case R_BFIN_LUIMM16:
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case R_BFIN_RIMM16:
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size = 2;
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break;
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case R_BFIN_BYTE4_DATA:
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size = 4;
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break;
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case R_BFIN_PCREL24:
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case R_BFIN_PCREL24_JUMP_L:
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case R_BFIN_PCREL12_JUMP:
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case R_BFIN_PCREL12_JUMP_S:
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case R_BFIN_PCREL10:
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pr_err("unsupported relocation: %u (no -mlong-calls?)\n",
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ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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default:
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pr_err("unknown relocation: %u\n",
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ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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}
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switch (bfin_mem_access_type(location, size)) {
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case BFIN_MEM_ACCESS_CORE:
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case BFIN_MEM_ACCESS_CORE_ONLY:
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memcpy((void *)location, &value, size);
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break;
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case BFIN_MEM_ACCESS_DMA:
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dma_memcpy((void *)location, &value, size);
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break;
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case BFIN_MEM_ACCESS_ITEST:
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isram_memcpy((void *)location, &value, size);
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break;
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default:
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pr_err("invalid relocation for %#lx\n", location);
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return -ENOEXEC;
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}
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}
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return 0;
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}
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int
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module_finalize(const Elf_Ehdr * hdr,
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const Elf_Shdr * sechdrs, struct module *mod)
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{
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unsigned int i, strindex = 0, symindex = 0;
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char *secstrings;
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long err = 0;
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secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
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for (i = 1; i < hdr->e_shnum; i++) {
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/* Internal symbols and strings. */
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if (sechdrs[i].sh_type == SHT_SYMTAB) {
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symindex = i;
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strindex = sechdrs[i].sh_link;
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}
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}
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for (i = 1; i < hdr->e_shnum; i++) {
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const char *strtab = (char *)sechdrs[strindex].sh_addr;
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unsigned int info = sechdrs[i].sh_info;
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const char *shname = secstrings + sechdrs[i].sh_name;
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/* Not a valid relocation section? */
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if (info >= hdr->e_shnum)
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continue;
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/* Only support RELA relocation types */
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if (sechdrs[i].sh_type != SHT_RELA)
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continue;
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if (!strcmp(".rela.l2.text", shname) ||
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!strcmp(".rela.l1.text", shname) ||
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(!strcmp(".rela.text", shname) &&
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(hdr->e_flags & (EF_BFIN_CODE_IN_L1 | EF_BFIN_CODE_IN_L2)))) {
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err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
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symindex, i, mod);
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if (err < 0)
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return -ENOEXEC;
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}
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}
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return 0;
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}
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void module_arch_cleanup(struct module *mod)
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{
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l1_inst_sram_free(mod->arch.text_l1);
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l1_data_A_sram_free(mod->arch.data_a_l1);
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l1_data_A_sram_free(mod->arch.bss_a_l1);
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l1_data_B_sram_free(mod->arch.data_b_l1);
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l1_data_B_sram_free(mod->arch.bss_b_l1);
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l2_sram_free(mod->arch.text_l2);
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l2_sram_free(mod->arch.data_l2);
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l2_sram_free(mod->arch.bss_l2);
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}
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