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-rw-r--r--arch/blackfin/kernel/module.c429
1 files changed, 429 insertions, 0 deletions
diff --git a/arch/blackfin/kernel/module.c b/arch/blackfin/kernel/module.c
new file mode 100644
index 00000000000..372f756f1ad
--- /dev/null
+++ b/arch/blackfin/kernel/module.c
@@ -0,0 +1,429 @@
+/*
+ * File: arch/blackfin/kernel/module.c
+ * Based on:
+ * Author:
+ *
+ * Created:
+ * Description:
+ *
+ * Modified:
+ * Copyright 2004-2006 Analog Devices Inc.
+ *
+ * Bugs: Enter bugs at http://blackfin.uclinux.org/
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, see the file COPYING, or write
+ * to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#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>
+
+/*
+ * handle arithmetic relocations.
+ * See binutils/bfd/elf32-bfin.c for more details
+ */
+#define RELOC_STACK_SIZE 100
+static uint32_t reloc_stack[RELOC_STACK_SIZE];
+static unsigned int reloc_stack_tos;
+
+#define is_reloc_stack_empty() ((reloc_stack_tos > 0)?0:1)
+
+static void reloc_stack_push(uint32_t value)
+{
+ reloc_stack[reloc_stack_tos++] = value;
+}
+
+static uint32_t reloc_stack_pop(void)
+{
+ return reloc_stack[--reloc_stack_tos];
+}
+
+static uint32_t reloc_stack_operate(unsigned int oper, struct module *mod)
+{
+ uint32_t value;
+
+ switch (oper) {
+ case R_add:
+ value = reloc_stack[reloc_stack_tos - 2] +
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_sub:
+ value = reloc_stack[reloc_stack_tos - 2] -
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_mult:
+ value = reloc_stack[reloc_stack_tos - 2] *
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_div:
+ value = reloc_stack[reloc_stack_tos - 2] /
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_mod:
+ value = reloc_stack[reloc_stack_tos - 2] %
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_lshift:
+ value = reloc_stack[reloc_stack_tos - 2] <<
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_rshift:
+ value = reloc_stack[reloc_stack_tos - 2] >>
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_and:
+ value = reloc_stack[reloc_stack_tos - 2] &
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_or:
+ value = reloc_stack[reloc_stack_tos - 2] |
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_xor:
+ value = reloc_stack[reloc_stack_tos - 2] ^
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_land:
+ value = reloc_stack[reloc_stack_tos - 2] &&
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_lor:
+ value = reloc_stack[reloc_stack_tos - 2] ||
+ reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 2;
+ break;
+ case R_neg:
+ value = -reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos--;
+ break;
+ case R_comp:
+ value = ~reloc_stack[reloc_stack_tos - 1];
+ reloc_stack_tos -= 1;
+ break;
+ default:
+ printk(KERN_WARNING "module %s: unhandled reloction\n",
+ mod->name);
+ return 0;
+ }
+
+ /* now push the new value back on stack */
+ reloc_stack_push(value);
+
+ return value;
+}
+
+void *module_alloc(unsigned long size)
+{
+ if (size == 0)
+ return NULL;
+ return vmalloc(size);
+}
+
+/* Free memory returned from module_alloc */
+void module_free(struct module *mod, void *module_region)
+{
+ vfree(module_region);
+}
+
+/* Transfer the section to the L1 memory */
+int
+module_frob_arch_sections(Elf_Ehdr * hdr, Elf_Shdr * sechdrs,
+ char *secstrings, struct module *mod)
+{
+ Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
+ void *dest = NULL;
+
+ for (s = sechdrs; s < sechdrs_end; ++s) {
+ if ((strcmp(".l1.text", secstrings + s->sh_name) == 0) ||
+ ((strcmp(".text", secstrings + s->sh_name)==0) &&
+ (hdr->e_flags & FLG_CODE_IN_L1) && (s->sh_size > 0))) {
+ mod->arch.text_l1 = s;
+ dest = l1_inst_sram_alloc(s->sh_size);
+ if (dest == NULL) {
+ printk(KERN_ERR
+ "module %s: L1 instruction memory allocation failed\n",
+ mod->name);
+ return -1;
+ }
+ dma_memcpy(dest, (void *)s->sh_addr, s->sh_size);
+ s->sh_flags &= ~SHF_ALLOC;
+ s->sh_addr = (unsigned long)dest;
+ }
+ if ((strcmp(".l1.data", secstrings + s->sh_name) == 0)||
+ ((strcmp(".data", secstrings + s->sh_name)==0) &&
+ (hdr->e_flags & FLG_DATA_IN_L1) && (s->sh_size > 0))) {
+ mod->arch.data_a_l1 = s;
+ dest = l1_data_sram_alloc(s->sh_size);
+ if (dest == NULL) {
+ printk(KERN_ERR
+ "module %s: L1 data memory allocation failed\n",
+ mod->name);
+ return -1;
+ }
+ memcpy(dest, (void *)s->sh_addr, s->sh_size);
+ s->sh_flags &= ~SHF_ALLOC;
+ s->sh_addr = (unsigned long)dest;
+ }
+ if (strcmp(".l1.bss", secstrings + s->sh_name) == 0 ||
+ ((strcmp(".bss", secstrings + s->sh_name)==0) &&
+ (hdr->e_flags & FLG_DATA_IN_L1) && (s->sh_size > 0))) {
+ mod->arch.bss_a_l1 = s;
+ dest = l1_data_sram_alloc(s->sh_size);
+ if (dest == NULL) {
+ printk(KERN_ERR
+ "module %s: L1 data memory allocation failed\n",
+ mod->name);
+ return -1;
+ }
+ memset(dest, 0, s->sh_size);
+ s->sh_flags &= ~SHF_ALLOC;
+ s->sh_addr = (unsigned long)dest;
+ }
+ if (strcmp(".l1.data.B", secstrings + s->sh_name) == 0) {
+ mod->arch.data_b_l1 = s;
+ dest = l1_data_B_sram_alloc(s->sh_size);
+ if (dest == NULL) {
+ printk(KERN_ERR
+ "module %s: L1 data memory allocation failed\n",
+ mod->name);
+ return -1;
+ }
+ memcpy(dest, (void *)s->sh_addr, s->sh_size);
+ s->sh_flags &= ~SHF_ALLOC;
+ s->sh_addr = (unsigned long)dest;
+ }
+ if (strcmp(".l1.bss.B", secstrings + s->sh_name) == 0) {
+ mod->arch.bss_b_l1 = s;
+ dest = l1_data_B_sram_alloc(s->sh_size);
+ if (dest == NULL) {
+ printk(KERN_ERR
+ "module %s: L1 data memory allocation failed\n",
+ mod->name);
+ return -1;
+ }
+ memset(dest, 0, s->sh_size);
+ s->sh_flags &= ~SHF_ALLOC;
+ s->sh_addr = (unsigned long)dest;
+ }
+ }
+ return 0;
+}
+
+int
+apply_relocate(Elf_Shdr * sechdrs, const char *strtab,
+ unsigned int symindex, unsigned int relsec, struct module *me)
+{
+ printk(KERN_ERR "module %s: .rel unsupported\n", me->name);
+ return -ENOEXEC;
+}
+
+/*************************************************************************/
+/* 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_byte and R_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;
+ unsigned short tmp;
+ Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
+ Elf32_Sym *sym;
+ uint32_t *location32;
+ uint16_t *location16;
+ uint32_t value;
+
+ 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 */
+ location16 =
+ (uint16_t *) (sechdrs[sechdrs[relsec].sh_info].sh_addr +
+ rel[i].r_offset);
+ location32 = (uint32_t *) location16;
+ /* 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);
+ if (is_reloc_stack_empty()) {
+ value = sym->st_value;
+ } else {
+ value = reloc_stack_pop();
+ }
+ value += rel[i].r_addend;
+ pr_debug("location is %x, value is %x type is %d \n",
+ (unsigned int) location32, value,
+ ELF32_R_TYPE(rel[i].r_info));
+
+ switch (ELF32_R_TYPE(rel[i].r_info)) {
+
+ case R_pcrel24:
+ case R_pcrel24_jump_l:
+ /* Add the value, subtract its postition */
+ location16 =
+ (uint16_t *) (sechdrs[sechdrs[relsec].sh_info].
+ sh_addr + rel[i].r_offset - 2);
+ location32 = (uint32_t *) location16;
+ value -= (uint32_t) location32;
+ value >>= 1;
+ pr_debug("value is %x, before %x-%x after %x-%x\n", value,
+ *location16, *(location16 + 1),
+ (*location16 & 0xff00) | (value >> 16 & 0x00ff),
+ value & 0xffff);
+ *location16 =
+ (*location16 & 0xff00) | (value >> 16 & 0x00ff);
+ *(location16 + 1) = value & 0xffff;
+ break;
+ case R_pcrel12_jump:
+ case R_pcrel12_jump_s:
+ value -= (uint32_t) location32;
+ value >>= 1;
+ *location16 = (value & 0xfff);
+ break;
+ case R_pcrel10:
+ value -= (uint32_t) location32;
+ value >>= 1;
+ *location16 = (value & 0x3ff);
+ break;
+ case R_luimm16:
+ pr_debug("before %x after %x\n", *location16,
+ (value & 0xffff));
+ tmp = (value & 0xffff);
+ if((unsigned long)location16 >= L1_CODE_START) {
+ dma_memcpy(location16, &tmp, 2);
+ } else
+ *location16 = tmp;
+ break;
+ case R_huimm16:
+ pr_debug("before %x after %x\n", *location16,
+ ((value >> 16) & 0xffff));
+ tmp = ((value >> 16) & 0xffff);
+ if((unsigned long)location16 >= L1_CODE_START) {
+ dma_memcpy(location16, &tmp, 2);
+ } else
+ *location16 = tmp;
+ break;
+ case R_rimm16:
+ *location16 = (value & 0xffff);
+ break;
+ case R_byte4_data:
+ pr_debug("before %x after %x\n", *location32, value);
+ *location32 = value;
+ break;
+ case R_push:
+ reloc_stack_push(value);
+ break;
+ case R_const:
+ reloc_stack_push(rel[i].r_addend);
+ break;
+ case R_add:
+ case R_sub:
+ case R_mult:
+ case R_div:
+ case R_mod:
+ case R_lshift:
+ case R_rshift:
+ case R_and:
+ case R_or:
+ case R_xor:
+ case R_land:
+ case R_lor:
+ case R_neg:
+ case R_comp:
+ reloc_stack_operate(ELF32_R_TYPE(rel[i].r_info), mod);
+ break;
+ default:
+ printk(KERN_ERR "module %s: Unknown relocation: %u\n",
+ mod->name, ELF32_R_TYPE(rel[i].r_info));
+ 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;
+
+ 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;
+
+ /* Not a valid relocation section? */
+ if (info >= hdr->e_shnum)
+ continue;
+
+ if ((sechdrs[i].sh_type == SHT_RELA) &&
+ ((strcmp(".rela.l1.text", secstrings + sechdrs[i].sh_name) == 0)||
+ ((strcmp(".rela.text", secstrings + sechdrs[i].sh_name) == 0) &&
+ (hdr->e_flags & FLG_CODE_IN_L1)))) {
+ apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
+ symindex, i, mod);
+ }
+ }
+ return 0;
+}
+
+void module_arch_cleanup(struct module *mod)
+{
+ if ((mod->arch.text_l1) && (mod->arch.text_l1->sh_addr))
+ l1_inst_sram_free((void*)mod->arch.text_l1->sh_addr);
+ if ((mod->arch.data_a_l1) && (mod->arch.data_a_l1->sh_addr))
+ l1_data_sram_free((void*)mod->arch.data_a_l1->sh_addr);
+ if ((mod->arch.bss_a_l1) && (mod->arch.bss_a_l1->sh_addr))
+ l1_data_sram_free((void*)mod->arch.bss_a_l1->sh_addr);
+ if ((mod->arch.data_b_l1) && (mod->arch.data_b_l1->sh_addr))
+ l1_data_B_sram_free((void*)mod->arch.data_b_l1->sh_addr);
+ if ((mod->arch.bss_b_l1) && (mod->arch.bss_b_l1->sh_addr))
+ l1_data_B_sram_free((void*)mod->arch.bss_b_l1->sh_addr);
+}
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