X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=arch%2Farm%2Fkernel%2Fmodule.c;h=f28c5e9c51ea5e33967186ff07123262e8d0adf0;hb=cde3f8607350666c4dd120dbbdbd9c70ffb2ea61;hp=9203ba7d58eeaf7ce2ce05d8975c5bc9d3bd0793;hpb=8ec53663d2698076468b3e1edc4e1b418bd54de3;p=safe%2Fjmp%2Flinux-2.6 diff --git a/arch/arm/kernel/module.c b/arch/arm/kernel/module.c index 9203ba7..f28c5e9 100644 --- a/arch/arm/kernel/module.c +++ b/arch/arm/kernel/module.c @@ -21,17 +21,18 @@ #include #include +#include +#include #ifdef CONFIG_XIP_KERNEL /* * The XIP kernel text is mapped in the module area for modules and * some other stuff to work without any indirect relocations. - * MODULE_START is redefined here and not in asm/memory.h to avoid + * MODULES_VADDR is redefined here and not in asm/memory.h to avoid * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. */ -extern void _etext; -#undef MODULE_START -#define MODULE_START (((unsigned long)&_etext + ~PGDIR_MASK) & PGDIR_MASK) +#undef MODULES_VADDR +#define MODULES_VADDR (((unsigned long)_etext + ~PGDIR_MASK) & PGDIR_MASK) #endif #ifdef CONFIG_MMU @@ -43,7 +44,7 @@ void *module_alloc(unsigned long size) if (!size) return NULL; - area = __get_vm_area(size, VM_ALLOC, MODULE_START, MODULE_END); + area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); if (!area) return NULL; @@ -66,6 +67,24 @@ int module_frob_arch_sections(Elf_Ehdr *hdr, char *secstrings, struct module *mod) { +#ifdef CONFIG_ARM_UNWIND + Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum; + + for (s = sechdrs; s < sechdrs_end; s++) { + if (strcmp(".ARM.exidx.init.text", secstrings + s->sh_name) == 0) + mod->arch.unw_sec_init = s; + else if (strcmp(".ARM.exidx.devinit.text", secstrings + s->sh_name) == 0) + mod->arch.unw_sec_devinit = s; + else if (strcmp(".ARM.exidx", secstrings + s->sh_name) == 0) + mod->arch.unw_sec_core = s; + else if (strcmp(".init.text", secstrings + s->sh_name) == 0) + mod->arch.sec_init_text = s; + else if (strcmp(".devinit.text", secstrings + s->sh_name) == 0) + mod->arch.sec_devinit_text = s; + else if (strcmp(".text", secstrings + s->sh_name) == 0) + mod->arch.sec_core_text = s; + } +#endif return 0; } @@ -83,6 +102,7 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned long loc; Elf32_Sym *sym; s32 offset; + u32 upper, lower, sign, j1, j2; offset = ELF32_R_SYM(rel->r_info); if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { @@ -104,6 +124,10 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, loc = dstsec->sh_addr + rel->r_offset; switch (ELF32_R_TYPE(rel->r_info)) { + case R_ARM_NONE: + /* ignore */ + break; + case R_ARM_ABS32: *(u32 *)loc += sym->st_value; break; @@ -132,6 +156,87 @@ apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, *(u32 *)loc |= offset & 0x00ffffff; break; + case R_ARM_V4BX: + /* Preserve Rm and the condition code. Alter + * other bits to re-code instruction as + * MOV PC,Rm. + */ + *(u32 *)loc &= 0xf000000f; + *(u32 *)loc |= 0x01a0f000; + break; + + case R_ARM_PREL31: + offset = *(u32 *)loc + sym->st_value - loc; + *(u32 *)loc = offset & 0x7fffffff; + break; + + case R_ARM_MOVW_ABS_NC: + case R_ARM_MOVT_ABS: + offset = *(u32 *)loc; + offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff); + offset = (offset ^ 0x8000) - 0x8000; + + offset += sym->st_value; + if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS) + offset >>= 16; + + *(u32 *)loc &= 0xfff0f000; + *(u32 *)loc |= ((offset & 0xf000) << 4) | + (offset & 0x0fff); + break; + + case R_ARM_THM_CALL: + case R_ARM_THM_JUMP24: + upper = *(u16 *)loc; + lower = *(u16 *)(loc + 2); + + /* + * 25 bit signed address range (Thumb-2 BL and B.W + * instructions): + * S:I1:I2:imm10:imm11:0 + * where: + * S = upper[10] = offset[24] + * I1 = ~(J1 ^ S) = offset[23] + * I2 = ~(J2 ^ S) = offset[22] + * imm10 = upper[9:0] = offset[21:12] + * imm11 = lower[10:0] = offset[11:1] + * J1 = lower[13] + * J2 = lower[11] + */ + sign = (upper >> 10) & 1; + j1 = (lower >> 13) & 1; + j2 = (lower >> 11) & 1; + offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) | + ((~(j2 ^ sign) & 1) << 22) | + ((upper & 0x03ff) << 12) | + ((lower & 0x07ff) << 1); + if (offset & 0x01000000) + offset -= 0x02000000; + offset += sym->st_value - loc; + + /* only Thumb addresses allowed (no interworking) */ + if (!(offset & 1) || + offset <= (s32)0xff000000 || + offset >= (s32)0x01000000) { + printk(KERN_ERR + "%s: relocation out of range, section " + "%d reloc %d sym '%s'\n", module->name, + relindex, i, strtab + sym->st_name); + return -ENOEXEC; + } + + sign = (offset >> 24) & 1; + j1 = sign ^ (~(offset >> 23) & 1); + j2 = sign ^ (~(offset >> 22) & 1); + *(u16 *)loc = (u16)((upper & 0xf800) | (sign << 10) | + ((offset >> 12) & 0x03ff)); + *(u16 *)(loc + 2) = (u16)((lower & 0xd000) | + (j1 << 13) | (j2 << 11) | + ((offset >> 1) & 0x07ff)); + upper = *(u16 *)loc; + lower = *(u16 *)(loc + 2); + break; + default: printk(KERN_ERR "%s: unknown relocation: %u\n", module->name, ELF32_R_TYPE(rel->r_info)); @@ -150,14 +255,50 @@ apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, return -ENOEXEC; } +#ifdef CONFIG_ARM_UNWIND +static void register_unwind_tables(struct module *mod) +{ + if (mod->arch.unw_sec_init && mod->arch.sec_init_text) + mod->arch.unwind_init = + unwind_table_add(mod->arch.unw_sec_init->sh_addr, + mod->arch.unw_sec_init->sh_size, + mod->arch.sec_init_text->sh_addr, + mod->arch.sec_init_text->sh_size); + if (mod->arch.unw_sec_devinit && mod->arch.sec_devinit_text) + mod->arch.unwind_devinit = + unwind_table_add(mod->arch.unw_sec_devinit->sh_addr, + mod->arch.unw_sec_devinit->sh_size, + mod->arch.sec_devinit_text->sh_addr, + mod->arch.sec_devinit_text->sh_size); + if (mod->arch.unw_sec_core && mod->arch.sec_core_text) + mod->arch.unwind_core = + unwind_table_add(mod->arch.unw_sec_core->sh_addr, + mod->arch.unw_sec_core->sh_size, + mod->arch.sec_core_text->sh_addr, + mod->arch.sec_core_text->sh_size); +} + +static void unregister_unwind_tables(struct module *mod) +{ + unwind_table_del(mod->arch.unwind_init); + unwind_table_del(mod->arch.unwind_devinit); + unwind_table_del(mod->arch.unwind_core); +} +#else +static inline void register_unwind_tables(struct module *mod) { } +static inline void unregister_unwind_tables(struct module *mod) { } +#endif + int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *module) { + register_unwind_tables(module); return 0; } void module_arch_cleanup(struct module *mod) { + unregister_unwind_tables(mod); }