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-rw-r--r--arch/blackfin/kernel/module.c289
1 files changed, 289 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/module.c b/arch/blackfin/kernel/module.c
new file mode 100644
index 000000000..4489efc52
--- /dev/null
+++ b/arch/blackfin/kernel/module.c
@@ -0,0 +1,289 @@
+/*
+ * Copyright 2004-2009 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later
+ */
+
+#define pr_fmt(fmt) "module %s: " fmt, mod->name
+
+#include <linux/moduleloader.h>
+#include <linux/elf.h>
+#include <linux/vmalloc.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <asm/dma.h>
+#include <asm/cacheflush.h>
+#include <asm/uaccess.h>
+
+/* Transfer the section to the L1 memory */
+int
+module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
+ char *secstrings, struct module *mod)
+{
+ /*
+ * XXX: sechdrs are vmalloced in kernel/module.c
+ * and would be vfreed just after module is loaded,
+ * so we hack to keep the only information we needed
+ * in mod->arch to correctly free L1 I/D sram later.
+ * NOTE: this breaks the semantic of mod->arch structure.
+ */
+ Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
+ void *dest;
+
+ for (s = sechdrs; s < sechdrs_end; ++s) {
+ const char *shname = secstrings + s->sh_name;
+
+ if (s->sh_size == 0)
+ continue;
+
+ if (!strcmp(".l1.text", shname) ||
+ (!strcmp(".text", shname) &&
+ (hdr->e_flags & EF_BFIN_CODE_IN_L1))) {
+
+ dest = l1_inst_sram_alloc(s->sh_size);
+ mod->arch.text_l1 = dest;
+ if (dest == NULL) {
+ pr_err("L1 inst memory allocation failed\n");
+ return -1;
+ }
+ dma_memcpy(dest, (void *)s->sh_addr, s->sh_size);
+
+ } else if (!strcmp(".l1.data", shname) ||
+ (!strcmp(".data", shname) &&
+ (hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
+
+ dest = l1_data_sram_alloc(s->sh_size);
+ mod->arch.data_a_l1 = dest;
+ if (dest == NULL) {
+ pr_err("L1 data memory allocation failed\n");
+ return -1;
+ }
+ memcpy(dest, (void *)s->sh_addr, s->sh_size);
+
+ } else if (!strcmp(".l1.bss", shname) ||
+ (!strcmp(".bss", shname) &&
+ (hdr->e_flags & EF_BFIN_DATA_IN_L1))) {
+
+ dest = l1_data_sram_zalloc(s->sh_size);
+ mod->arch.bss_a_l1 = dest;
+ if (dest == NULL) {
+ pr_err("L1 data memory allocation failed\n");
+ return -1;
+ }
+
+ } else if (!strcmp(".l1.data.B", shname)) {
+
+ dest = l1_data_B_sram_alloc(s->sh_size);
+ mod->arch.data_b_l1 = dest;
+ if (dest == NULL) {
+ pr_err("L1 data memory allocation failed\n");
+ return -1;
+ }
+ memcpy(dest, (void *)s->sh_addr, s->sh_size);
+
+ } else if (!strcmp(".l1.bss.B", shname)) {
+
+ dest = l1_data_B_sram_alloc(s->sh_size);
+ mod->arch.bss_b_l1 = dest;
+ if (dest == NULL) {
+ pr_err("L1 data memory allocation failed\n");
+ return -1;
+ }
+ memset(dest, 0, s->sh_size);
+
+ } else if (!strcmp(".l2.text", shname) ||
+ (!strcmp(".text", shname) &&
+ (hdr->e_flags & EF_BFIN_CODE_IN_L2))) {
+
+ dest = l2_sram_alloc(s->sh_size);
+ mod->arch.text_l2 = dest;
+ if (dest == NULL) {
+ pr_err("L2 SRAM allocation failed\n");
+ return -1;
+ }
+ memcpy(dest, (void *)s->sh_addr, s->sh_size);
+
+ } else if (!strcmp(".l2.data", shname) ||
+ (!strcmp(".data", shname) &&
+ (hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
+
+ dest = l2_sram_alloc(s->sh_size);
+ mod->arch.data_l2 = dest;
+ if (dest == NULL) {
+ pr_err("L2 SRAM allocation failed\n");
+ return -1;
+ }
+ memcpy(dest, (void *)s->sh_addr, s->sh_size);
+
+ } else if (!strcmp(".l2.bss", shname) ||
+ (!strcmp(".bss", shname) &&
+ (hdr->e_flags & EF_BFIN_DATA_IN_L2))) {
+
+ dest = l2_sram_zalloc(s->sh_size);
+ mod->arch.bss_l2 = dest;
+ if (dest == NULL) {
+ pr_err("L2 SRAM allocation failed\n");
+ return -1;
+ }
+
+ } else
+ continue;
+
+ s->sh_flags &= ~SHF_ALLOC;
+ s->sh_addr = (unsigned long)dest;
+ }
+
+ return 0;
+}
+
+/*************************************************************************/
+/* FUNCTION : apply_relocate_add */
+/* ABSTRACT : Blackfin specific relocation handling for the loadable */
+/* modules. Modules are expected to be .o files. */
+/* Arithmetic relocations are handled. */
+/* We do not expect LSETUP to be split and hence is not */
+/* handled. */
+/* R_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the */
+/* gas does not generate it. */
+/*************************************************************************/
+int
+apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
+ unsigned int symindex, unsigned int relsec,
+ struct module *mod)
+{
+ unsigned int i;
+ Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
+ Elf32_Sym *sym;
+ unsigned long location, value, size;
+
+ pr_debug("applying relocate section %u to %u\n",
+ relsec, sechdrs[relsec].sh_info);
+
+ for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
+ /* This is where to make the change */
+ location = sechdrs[sechdrs[relsec].sh_info].sh_addr +
+ rel[i].r_offset;
+
+ /* This is the symbol it is referring to. Note that all
+ undefined symbols have been resolved. */
+ sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
+ + ELF32_R_SYM(rel[i].r_info);
+ value = sym->st_value;
+ value += rel[i].r_addend;
+
+#ifdef CONFIG_SMP
+ if (location >= COREB_L1_DATA_A_START) {
+ pr_err("cannot relocate in L1: %u (SMP kernel)\n",
+ ELF32_R_TYPE(rel[i].r_info));
+ return -ENOEXEC;
+ }
+#endif
+
+ pr_debug("location is %lx, value is %lx type is %d\n",
+ location, value, ELF32_R_TYPE(rel[i].r_info));
+
+ switch (ELF32_R_TYPE(rel[i].r_info)) {
+
+ case R_BFIN_HUIMM16:
+ value >>= 16;
+ case R_BFIN_LUIMM16:
+ case R_BFIN_RIMM16:
+ size = 2;
+ break;
+ case R_BFIN_BYTE4_DATA:
+ size = 4;
+ break;
+
+ case R_BFIN_PCREL24:
+ case R_BFIN_PCREL24_JUMP_L:
+ case R_BFIN_PCREL12_JUMP:
+ case R_BFIN_PCREL12_JUMP_S:
+ case R_BFIN_PCREL10:
+ pr_err("unsupported relocation: %u (no -mlong-calls?)\n",
+ ELF32_R_TYPE(rel[i].r_info));
+ return -ENOEXEC;
+
+ default:
+ pr_err("unknown relocation: %u\n",
+ ELF32_R_TYPE(rel[i].r_info));
+ return -ENOEXEC;
+ }
+
+ switch (bfin_mem_access_type(location, size)) {
+ case BFIN_MEM_ACCESS_CORE:
+ case BFIN_MEM_ACCESS_CORE_ONLY:
+ memcpy((void *)location, &value, size);
+ break;
+ case BFIN_MEM_ACCESS_DMA:
+ dma_memcpy((void *)location, &value, size);
+ break;
+ case BFIN_MEM_ACCESS_ITEST:
+ isram_memcpy((void *)location, &value, size);
+ break;
+ default:
+ pr_err("invalid relocation for %#lx\n", location);
+ return -ENOEXEC;
+ }
+ }
+
+ return 0;
+}
+
+int
+module_finalize(const Elf_Ehdr * hdr,
+ const Elf_Shdr * sechdrs, struct module *mod)
+{
+ unsigned int i, strindex = 0, symindex = 0;
+ char *secstrings;
+ long err = 0;
+
+ secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
+
+ for (i = 1; i < hdr->e_shnum; i++) {
+ /* Internal symbols and strings. */
+ if (sechdrs[i].sh_type == SHT_SYMTAB) {
+ symindex = i;
+ strindex = sechdrs[i].sh_link;
+ }
+ }
+
+ for (i = 1; i < hdr->e_shnum; i++) {
+ const char *strtab = (char *)sechdrs[strindex].sh_addr;
+ unsigned int info = sechdrs[i].sh_info;
+ const char *shname = secstrings + sechdrs[i].sh_name;
+
+ /* Not a valid relocation section? */
+ if (info >= hdr->e_shnum)
+ continue;
+
+ /* Only support RELA relocation types */
+ if (sechdrs[i].sh_type != SHT_RELA)
+ continue;
+
+ if (!strcmp(".rela.l2.text", shname) ||
+ !strcmp(".rela.l1.text", shname) ||
+ (!strcmp(".rela.text", shname) &&
+ (hdr->e_flags & (EF_BFIN_CODE_IN_L1 | EF_BFIN_CODE_IN_L2)))) {
+
+ err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
+ symindex, i, mod);
+ if (err < 0)
+ return -ENOEXEC;
+ }
+ }
+
+ return 0;
+}
+
+void module_arch_cleanup(struct module *mod)
+{
+ l1_inst_sram_free(mod->arch.text_l1);
+ l1_data_A_sram_free(mod->arch.data_a_l1);
+ l1_data_A_sram_free(mod->arch.bss_a_l1);
+ l1_data_B_sram_free(mod->arch.data_b_l1);
+ l1_data_B_sram_free(mod->arch.bss_b_l1);
+ l2_sram_free(mod->arch.text_l2);
+ l2_sram_free(mod->arch.data_l2);
+ l2_sram_free(mod->arch.bss_l2);
+}
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