[XTENSA] Add kernel module support
Add kernel module support.
Signed-off-by: Chris Zankel <chris@zankel.net>
diff --git a/arch/xtensa/kernel/module.c b/arch/xtensa/kernel/module.c
index 2ea1755..ddf14dc 100644
--- a/arch/xtensa/kernel/module.c
+++ b/arch/xtensa/kernel/module.c
@@ -7,7 +7,7 @@
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
- * Copyright (C) 2001 - 2005 Tensilica Inc.
+ * Copyright (C) 2001 - 2006 Tensilica Inc.
*
* Chris Zankel <chris@zankel.net>
*
@@ -22,57 +22,216 @@
#include <linux/kernel.h>
#include <linux/cache.h>
-LIST_HEAD(module_buf_list);
+#undef DEBUG_RELOCATE
void *module_alloc(unsigned long size)
{
- panic("module_alloc not implemented");
+ if (size == 0)
+ return NULL;
+ return vmalloc(size);
}
void module_free(struct module *mod, void *module_region)
{
- panic("module_free not implemented");
+ vfree(module_region);
+ /* FIXME: If module_region == mod->init_region, trim exception
+ table entries. */
}
int module_frob_arch_sections(Elf32_Ehdr *hdr,
Elf32_Shdr *sechdrs,
char *secstrings,
- struct module *me)
+ struct module *mod)
{
- panic("module_frob_arch_sections not implemented");
+ return 0;
+}
+
+static int
+decode_calln_opcode (unsigned char *location)
+{
+#ifdef __XTENSA_EB__
+ return (location[0] & 0xf0) == 0x50;
+#endif
+#ifdef __XTENSA_EL__
+ return (location[0] & 0xf) == 0x5;
+#endif
+}
+
+static int
+decode_l32r_opcode (unsigned char *location)
+{
+#ifdef __XTENSA_EB__
+ return (location[0] & 0xf0) == 0x10;
+#endif
+#ifdef __XTENSA_EL__
+ return (location[0] & 0xf) == 0x1;
+#endif
}
int apply_relocate(Elf32_Shdr *sechdrs,
const char *strtab,
unsigned int symindex,
unsigned int relsec,
- struct module *module)
+ struct module *mod)
{
- panic ("apply_relocate not implemented");
+ printk(KERN_ERR "module %s: REL RELOCATION unsupported\n",
+ mod->name);
+ return -ENOEXEC;
+
}
int apply_relocate_add(Elf32_Shdr *sechdrs,
const char *strtab,
unsigned int symindex,
unsigned int relsec,
- struct module *module)
+ struct module *mod)
{
- panic("apply_relocate_add not implemented");
+ unsigned int i;
+ Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
+ Elf32_Sym *sym;
+ unsigned char *location;
+ uint32_t value;
+
+#ifdef DEBUG_RELOCATE
+ printk("Applying relocate section %u to %u\n", relsec,
+ sechdrs[relsec].sh_info);
+#endif
+ for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
+ location = (char *)sechdrs[sechdrs[relsec].sh_info].sh_addr
+ + rela[i].r_offset;
+ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
+ + ELF32_R_SYM(rela[i].r_info);
+ value = sym->st_value + rela[i].r_addend;
+
+ switch (ELF32_R_TYPE(rela[i].r_info)) {
+ case R_XTENSA_NONE:
+ case R_XTENSA_DIFF8:
+ case R_XTENSA_DIFF16:
+ case R_XTENSA_DIFF32:
+ case R_XTENSA_ASM_EXPAND:
+ break;
+
+ case R_XTENSA_32:
+ case R_XTENSA_PLT:
+ *(uint32_t *)location += value;
+ break;
+
+ case R_XTENSA_SLOT0_OP:
+ if (decode_calln_opcode(location)) {
+ value -= ((unsigned long)location & -4) + 4;
+ if ((value & 3) != 0 ||
+ ((value + (1 << 19)) >> 20) != 0) {
+ printk("%s: relocation out of range, "
+ "section %d reloc %d "
+ "sym '%s'\n",
+ mod->name, relsec, i,
+ strtab + sym->st_name);
+ return -ENOEXEC;
+ }
+ value = (signed int)value >> 2;
+#ifdef __XTENSA_EB__
+ location[0] = ((location[0] & ~0x3) |
+ ((value >> 16) & 0x3));
+ location[1] = (value >> 8) & 0xff;
+ location[2] = value & 0xff;
+#endif
+#ifdef __XTENSA_EL__
+ location[0] = ((location[0] & ~0xc0) |
+ ((value << 6) & 0xc0));
+ location[1] = (value >> 2) & 0xff;
+ location[2] = (value >> 10) & 0xff;
+#endif
+ } else if (decode_l32r_opcode(location)) {
+ value -= (((unsigned long)location + 3) & -4);
+ if ((value & 3) != 0 ||
+ (signed int)value >> 18 != -1) {
+ printk("%s: relocation out of range, "
+ "section %d reloc %d "
+ "sym '%s'\n",
+ mod->name, relsec, i,
+ strtab + sym->st_name);
+ return -ENOEXEC;
+ }
+ value = (signed int)value >> 2;
+
+#ifdef __XTENSA_EB__
+ location[1] = (value >> 8) & 0xff;
+ location[2] = value & 0xff;
+#endif
+#ifdef __XTENSA_EL__
+ location[1] = value & 0xff;
+ location[2] = (value >> 8) & 0xff;
+#endif
+ }
+ /* FIXME: Ignore any other opcodes. The Xtensa
+ assembler currently assumes that the linker will
+ always do relaxation and so all PC-relative
+ operands need relocations. (The assembler also
+ writes out the tentative PC-relative values,
+ assuming no link-time relaxation, so it is usually
+ safe to ignore the relocations.) If the
+ assembler's "--no-link-relax" flag can be made to
+ work, and if all kernel modules can be assembled
+ with that flag, then unexpected relocations could
+ be detected here. */
+ break;
+
+ case R_XTENSA_SLOT1_OP:
+ case R_XTENSA_SLOT2_OP:
+ case R_XTENSA_SLOT3_OP:
+ case R_XTENSA_SLOT4_OP:
+ case R_XTENSA_SLOT5_OP:
+ case R_XTENSA_SLOT6_OP:
+ case R_XTENSA_SLOT7_OP:
+ case R_XTENSA_SLOT8_OP:
+ case R_XTENSA_SLOT9_OP:
+ case R_XTENSA_SLOT10_OP:
+ case R_XTENSA_SLOT11_OP:
+ case R_XTENSA_SLOT12_OP:
+ case R_XTENSA_SLOT13_OP:
+ case R_XTENSA_SLOT14_OP:
+ printk("%s: unexpected FLIX relocation: %u\n",
+ mod->name,
+ ELF32_R_TYPE(rela[i].r_info));
+ return -ENOEXEC;
+
+ case R_XTENSA_SLOT0_ALT:
+ case R_XTENSA_SLOT1_ALT:
+ case R_XTENSA_SLOT2_ALT:
+ case R_XTENSA_SLOT3_ALT:
+ case R_XTENSA_SLOT4_ALT:
+ case R_XTENSA_SLOT5_ALT:
+ case R_XTENSA_SLOT6_ALT:
+ case R_XTENSA_SLOT7_ALT:
+ case R_XTENSA_SLOT8_ALT:
+ case R_XTENSA_SLOT9_ALT:
+ case R_XTENSA_SLOT10_ALT:
+ case R_XTENSA_SLOT11_ALT:
+ case R_XTENSA_SLOT12_ALT:
+ case R_XTENSA_SLOT13_ALT:
+ case R_XTENSA_SLOT14_ALT:
+ printk("%s: unexpected ALT relocation: %u\n",
+ mod->name,
+ ELF32_R_TYPE(rela[i].r_info));
+ return -ENOEXEC;
+
+ default:
+ printk("%s: unexpected relocation: %u\n",
+ mod->name,
+ ELF32_R_TYPE(rela[i].r_info));
+ return -ENOEXEC;
+ }
+ }
+ return 0;
}
int module_finalize(const Elf_Ehdr *hdr,
const Elf_Shdr *sechdrs,
- struct module *me)
+ struct module *mod)
{
- panic ("module_finalize not implemented");
+ return 0;
}
void module_arch_cleanup(struct module *mod)
{
- panic("module_arch_cleanup not implemented");
-}
-
-struct bug_entry *module_find_bug(unsigned long bugaddr)
-{
- panic("module_find_bug not implemented");
}
diff --git a/include/asm-xtensa/elf.h b/include/asm-xtensa/elf.h
index 1569b53..7083d46 100644
--- a/include/asm-xtensa/elf.h
+++ b/include/asm-xtensa/elf.h
@@ -20,6 +20,56 @@
#define EM_XTENSA 94
#define EM_XTENSA_OLD 0xABC7
+/* Xtensa relocations defined by the ABIs */
+
+#define R_XTENSA_NONE 0
+#define R_XTENSA_32 1
+#define R_XTENSA_RTLD 2
+#define R_XTENSA_GLOB_DAT 3
+#define R_XTENSA_JMP_SLOT 4
+#define R_XTENSA_RELATIVE 5
+#define R_XTENSA_PLT 6
+#define R_XTENSA_OP0 8
+#define R_XTENSA_OP1 9
+#define R_XTENSA_OP2 10
+#define R_XTENSA_ASM_EXPAND 11
+#define R_XTENSA_ASM_SIMPLIFY 12
+#define R_XTENSA_GNU_VTINHERIT 15
+#define R_XTENSA_GNU_VTENTRY 16
+#define R_XTENSA_DIFF8 17
+#define R_XTENSA_DIFF16 18
+#define R_XTENSA_DIFF32 19
+#define R_XTENSA_SLOT0_OP 20
+#define R_XTENSA_SLOT1_OP 21
+#define R_XTENSA_SLOT2_OP 22
+#define R_XTENSA_SLOT3_OP 23
+#define R_XTENSA_SLOT4_OP 24
+#define R_XTENSA_SLOT5_OP 25
+#define R_XTENSA_SLOT6_OP 26
+#define R_XTENSA_SLOT7_OP 27
+#define R_XTENSA_SLOT8_OP 28
+#define R_XTENSA_SLOT9_OP 29
+#define R_XTENSA_SLOT10_OP 30
+#define R_XTENSA_SLOT11_OP 31
+#define R_XTENSA_SLOT12_OP 32
+#define R_XTENSA_SLOT13_OP 33
+#define R_XTENSA_SLOT14_OP 34
+#define R_XTENSA_SLOT0_ALT 35
+#define R_XTENSA_SLOT1_ALT 36
+#define R_XTENSA_SLOT2_ALT 37
+#define R_XTENSA_SLOT3_ALT 38
+#define R_XTENSA_SLOT4_ALT 39
+#define R_XTENSA_SLOT5_ALT 40
+#define R_XTENSA_SLOT6_ALT 41
+#define R_XTENSA_SLOT7_ALT 42
+#define R_XTENSA_SLOT8_ALT 43
+#define R_XTENSA_SLOT9_ALT 44
+#define R_XTENSA_SLOT10_ALT 45
+#define R_XTENSA_SLOT11_ALT 46
+#define R_XTENSA_SLOT12_ALT 47
+#define R_XTENSA_SLOT13_ALT 48
+#define R_XTENSA_SLOT14_ALT 49
+
/* ELF register definitions. This is needed for core dump support. */
/*