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447 lines
12 KiB
447 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/arch/arm/kernel/module.c |
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* |
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* Copyright (C) 2002 Russell King. |
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* Modified for nommu by Hyok S. Choi |
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* |
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* Module allocation method suggested by Andi Kleen. |
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*/ |
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#include <linux/module.h> |
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#include <linux/moduleloader.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.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/gfp.h> |
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|
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#include <asm/sections.h> |
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#include <asm/smp_plat.h> |
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#include <asm/unwind.h> |
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#include <asm/opcodes.h> |
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|
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#ifdef CONFIG_XIP_KERNEL |
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/* |
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* The XIP kernel text is mapped in the module area for modules and |
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* some other stuff to work without any indirect relocations. |
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* MODULES_VADDR is redefined here and not in asm/memory.h to avoid |
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* recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. |
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*/ |
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#undef MODULES_VADDR |
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#define MODULES_VADDR (((unsigned long)_exiprom + ~PMD_MASK) & PMD_MASK) |
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#endif |
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#ifdef CONFIG_MMU |
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void *module_alloc(unsigned long size) |
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{ |
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gfp_t gfp_mask = GFP_KERNEL; |
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void *p; |
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|
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/* Silence the initial allocation */ |
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if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) |
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gfp_mask |= __GFP_NOWARN; |
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p = __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, |
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gfp_mask, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE, |
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__builtin_return_address(0)); |
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if (!IS_ENABLED(CONFIG_ARM_MODULE_PLTS) || p) |
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return p; |
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return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, |
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GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE, |
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__builtin_return_address(0)); |
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} |
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#endif |
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bool module_init_section(const char *name) |
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{ |
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return strstarts(name, ".init") || |
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strstarts(name, ".ARM.extab.init") || |
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strstarts(name, ".ARM.exidx.init"); |
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} |
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bool module_exit_section(const char *name) |
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{ |
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return strstarts(name, ".exit") || |
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strstarts(name, ".ARM.extab.exit") || |
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strstarts(name, ".ARM.exidx.exit"); |
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} |
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int |
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apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, |
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unsigned int relindex, struct module *module) |
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{ |
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Elf32_Shdr *symsec = sechdrs + symindex; |
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Elf32_Shdr *relsec = sechdrs + relindex; |
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Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; |
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Elf32_Rel *rel = (void *)relsec->sh_addr; |
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unsigned int i; |
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for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { |
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unsigned long loc; |
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Elf32_Sym *sym; |
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const char *symname; |
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s32 offset; |
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u32 tmp; |
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#ifdef CONFIG_THUMB2_KERNEL |
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u32 upper, lower, sign, j1, j2; |
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#endif |
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offset = ELF32_R_SYM(rel->r_info); |
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if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { |
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pr_err("%s: section %u reloc %u: bad relocation sym offset\n", |
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module->name, relindex, i); |
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return -ENOEXEC; |
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} |
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sym = ((Elf32_Sym *)symsec->sh_addr) + offset; |
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symname = strtab + sym->st_name; |
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if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { |
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pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n", |
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module->name, relindex, i, symname, |
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rel->r_offset, dstsec->sh_size); |
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return -ENOEXEC; |
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} |
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loc = dstsec->sh_addr + rel->r_offset; |
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switch (ELF32_R_TYPE(rel->r_info)) { |
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case R_ARM_NONE: |
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/* ignore */ |
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break; |
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case R_ARM_ABS32: |
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case R_ARM_TARGET1: |
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*(u32 *)loc += sym->st_value; |
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break; |
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case R_ARM_PC24: |
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case R_ARM_CALL: |
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case R_ARM_JUMP24: |
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if (sym->st_value & 3) { |
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pr_err("%s: section %u reloc %u sym '%s': unsupported interworking call (ARM -> Thumb)\n", |
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module->name, relindex, i, symname); |
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return -ENOEXEC; |
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} |
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offset = __mem_to_opcode_arm(*(u32 *)loc); |
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offset = (offset & 0x00ffffff) << 2; |
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if (offset & 0x02000000) |
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offset -= 0x04000000; |
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offset += sym->st_value - loc; |
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/* |
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* Route through a PLT entry if 'offset' exceeds the |
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* supported range. Note that 'offset + loc + 8' |
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* contains the absolute jump target, i.e., |
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* @sym + addend, corrected for the +8 PC bias. |
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*/ |
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if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) && |
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(offset <= (s32)0xfe000000 || |
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offset >= (s32)0x02000000)) |
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offset = get_module_plt(module, loc, |
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offset + loc + 8) |
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- loc - 8; |
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if (offset <= (s32)0xfe000000 || |
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offset >= (s32)0x02000000) { |
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pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n", |
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module->name, relindex, i, symname, |
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ELF32_R_TYPE(rel->r_info), loc, |
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sym->st_value); |
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return -ENOEXEC; |
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} |
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offset >>= 2; |
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offset &= 0x00ffffff; |
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*(u32 *)loc &= __opcode_to_mem_arm(0xff000000); |
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*(u32 *)loc |= __opcode_to_mem_arm(offset); |
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break; |
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case R_ARM_V4BX: |
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/* Preserve Rm and the condition code. Alter |
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* other bits to re-code instruction as |
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* MOV PC,Rm. |
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*/ |
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*(u32 *)loc &= __opcode_to_mem_arm(0xf000000f); |
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*(u32 *)loc |= __opcode_to_mem_arm(0x01a0f000); |
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break; |
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case R_ARM_PREL31: |
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offset = (*(s32 *)loc << 1) >> 1; /* sign extend */ |
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offset += sym->st_value - loc; |
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if (offset >= 0x40000000 || offset < -0x40000000) { |
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pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n", |
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module->name, relindex, i, symname, |
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ELF32_R_TYPE(rel->r_info), loc, |
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sym->st_value); |
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return -ENOEXEC; |
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} |
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*(u32 *)loc &= 0x80000000; |
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*(u32 *)loc |= offset & 0x7fffffff; |
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break; |
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case R_ARM_REL32: |
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*(u32 *)loc += sym->st_value - loc; |
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break; |
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case R_ARM_MOVW_ABS_NC: |
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case R_ARM_MOVT_ABS: |
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case R_ARM_MOVW_PREL_NC: |
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case R_ARM_MOVT_PREL: |
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offset = tmp = __mem_to_opcode_arm(*(u32 *)loc); |
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offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff); |
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offset = (offset ^ 0x8000) - 0x8000; |
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offset += sym->st_value; |
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if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_PREL || |
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ELF32_R_TYPE(rel->r_info) == R_ARM_MOVW_PREL_NC) |
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offset -= loc; |
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if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS || |
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ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_PREL) |
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offset >>= 16; |
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tmp &= 0xfff0f000; |
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tmp |= ((offset & 0xf000) << 4) | |
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(offset & 0x0fff); |
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*(u32 *)loc = __opcode_to_mem_arm(tmp); |
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break; |
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#ifdef CONFIG_THUMB2_KERNEL |
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case R_ARM_THM_CALL: |
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case R_ARM_THM_JUMP24: |
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/* |
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* For function symbols, only Thumb addresses are |
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* allowed (no interworking). |
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* |
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* For non-function symbols, the destination |
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* has no specific ARM/Thumb disposition, so |
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* the branch is resolved under the assumption |
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* that interworking is not required. |
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*/ |
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if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC && |
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!(sym->st_value & 1)) { |
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pr_err("%s: section %u reloc %u sym '%s': unsupported interworking call (Thumb -> ARM)\n", |
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module->name, relindex, i, symname); |
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return -ENOEXEC; |
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} |
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upper = __mem_to_opcode_thumb16(*(u16 *)loc); |
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lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2)); |
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/* |
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* 25 bit signed address range (Thumb-2 BL and B.W |
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* instructions): |
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* S:I1:I2:imm10:imm11:0 |
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* where: |
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* S = upper[10] = offset[24] |
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* I1 = ~(J1 ^ S) = offset[23] |
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* I2 = ~(J2 ^ S) = offset[22] |
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* imm10 = upper[9:0] = offset[21:12] |
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* imm11 = lower[10:0] = offset[11:1] |
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* J1 = lower[13] |
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* J2 = lower[11] |
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*/ |
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sign = (upper >> 10) & 1; |
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j1 = (lower >> 13) & 1; |
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j2 = (lower >> 11) & 1; |
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offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) | |
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((~(j2 ^ sign) & 1) << 22) | |
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((upper & 0x03ff) << 12) | |
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((lower & 0x07ff) << 1); |
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if (offset & 0x01000000) |
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offset -= 0x02000000; |
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offset += sym->st_value - loc; |
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/* |
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* Route through a PLT entry if 'offset' exceeds the |
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* supported range. |
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*/ |
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if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) && |
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(offset <= (s32)0xff000000 || |
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offset >= (s32)0x01000000)) |
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offset = get_module_plt(module, loc, |
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offset + loc + 4) |
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- loc - 4; |
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if (offset <= (s32)0xff000000 || |
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offset >= (s32)0x01000000) { |
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pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n", |
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module->name, relindex, i, symname, |
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ELF32_R_TYPE(rel->r_info), loc, |
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sym->st_value); |
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return -ENOEXEC; |
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} |
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sign = (offset >> 24) & 1; |
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j1 = sign ^ (~(offset >> 23) & 1); |
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j2 = sign ^ (~(offset >> 22) & 1); |
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upper = (u16)((upper & 0xf800) | (sign << 10) | |
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((offset >> 12) & 0x03ff)); |
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lower = (u16)((lower & 0xd000) | |
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(j1 << 13) | (j2 << 11) | |
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((offset >> 1) & 0x07ff)); |
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*(u16 *)loc = __opcode_to_mem_thumb16(upper); |
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*(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower); |
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break; |
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case R_ARM_THM_MOVW_ABS_NC: |
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case R_ARM_THM_MOVT_ABS: |
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case R_ARM_THM_MOVW_PREL_NC: |
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case R_ARM_THM_MOVT_PREL: |
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upper = __mem_to_opcode_thumb16(*(u16 *)loc); |
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lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2)); |
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/* |
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* MOVT/MOVW instructions encoding in Thumb-2: |
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* |
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* i = upper[10] |
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* imm4 = upper[3:0] |
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* imm3 = lower[14:12] |
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* imm8 = lower[7:0] |
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* |
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* imm16 = imm4:i:imm3:imm8 |
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*/ |
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offset = ((upper & 0x000f) << 12) | |
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((upper & 0x0400) << 1) | |
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((lower & 0x7000) >> 4) | (lower & 0x00ff); |
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offset = (offset ^ 0x8000) - 0x8000; |
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offset += sym->st_value; |
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if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_PREL || |
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ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVW_PREL_NC) |
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offset -= loc; |
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if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS || |
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ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_PREL) |
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offset >>= 16; |
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upper = (u16)((upper & 0xfbf0) | |
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((offset & 0xf000) >> 12) | |
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((offset & 0x0800) >> 1)); |
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lower = (u16)((lower & 0x8f00) | |
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((offset & 0x0700) << 4) | |
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(offset & 0x00ff)); |
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*(u16 *)loc = __opcode_to_mem_thumb16(upper); |
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*(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower); |
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break; |
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#endif |
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default: |
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pr_err("%s: unknown relocation: %u\n", |
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module->name, ELF32_R_TYPE(rel->r_info)); |
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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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struct mod_unwind_map { |
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const Elf_Shdr *unw_sec; |
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const Elf_Shdr *txt_sec; |
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}; |
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static const Elf_Shdr *find_mod_section(const Elf32_Ehdr *hdr, |
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const Elf_Shdr *sechdrs, const char *name) |
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{ |
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const Elf_Shdr *s, *se; |
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const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
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for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) |
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if (strcmp(name, secstrs + s->sh_name) == 0) |
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return s; |
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return NULL; |
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} |
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extern void fixup_pv_table(const void *, unsigned long); |
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extern void fixup_smp(const void *, unsigned long); |
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int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, |
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struct module *mod) |
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{ |
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const Elf_Shdr *s = NULL; |
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#ifdef CONFIG_ARM_UNWIND |
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const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
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const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum; |
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struct mod_unwind_map maps[ARM_SEC_MAX]; |
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int i; |
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memset(maps, 0, sizeof(maps)); |
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for (s = sechdrs; s < sechdrs_end; s++) { |
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const char *secname = secstrs + s->sh_name; |
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if (!(s->sh_flags & SHF_ALLOC)) |
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continue; |
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if (strcmp(".ARM.exidx.init.text", secname) == 0) |
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maps[ARM_SEC_INIT].unw_sec = s; |
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else if (strcmp(".ARM.exidx", secname) == 0) |
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maps[ARM_SEC_CORE].unw_sec = s; |
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else if (strcmp(".ARM.exidx.exit.text", secname) == 0) |
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maps[ARM_SEC_EXIT].unw_sec = s; |
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else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0) |
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maps[ARM_SEC_UNLIKELY].unw_sec = s; |
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else if (strcmp(".ARM.exidx.text.hot", secname) == 0) |
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maps[ARM_SEC_HOT].unw_sec = s; |
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else if (strcmp(".init.text", secname) == 0) |
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maps[ARM_SEC_INIT].txt_sec = s; |
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else if (strcmp(".text", secname) == 0) |
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maps[ARM_SEC_CORE].txt_sec = s; |
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else if (strcmp(".exit.text", secname) == 0) |
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maps[ARM_SEC_EXIT].txt_sec = s; |
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else if (strcmp(".text.unlikely", secname) == 0) |
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maps[ARM_SEC_UNLIKELY].txt_sec = s; |
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else if (strcmp(".text.hot", secname) == 0) |
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maps[ARM_SEC_HOT].txt_sec = s; |
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} |
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for (i = 0; i < ARM_SEC_MAX; i++) |
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if (maps[i].unw_sec && maps[i].txt_sec) |
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mod->arch.unwind[i] = |
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unwind_table_add(maps[i].unw_sec->sh_addr, |
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maps[i].unw_sec->sh_size, |
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maps[i].txt_sec->sh_addr, |
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maps[i].txt_sec->sh_size); |
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#endif |
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#ifdef CONFIG_ARM_PATCH_PHYS_VIRT |
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s = find_mod_section(hdr, sechdrs, ".pv_table"); |
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if (s) |
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fixup_pv_table((void *)s->sh_addr, s->sh_size); |
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#endif |
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s = find_mod_section(hdr, sechdrs, ".alt.smp.init"); |
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if (s && !is_smp()) |
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#ifdef CONFIG_SMP_ON_UP |
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fixup_smp((void *)s->sh_addr, s->sh_size); |
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#else |
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return -EINVAL; |
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#endif |
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return 0; |
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} |
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void |
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module_arch_cleanup(struct module *mod) |
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{ |
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#ifdef CONFIG_ARM_UNWIND |
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int i; |
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for (i = 0; i < ARM_SEC_MAX; i++) { |
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unwind_table_del(mod->arch.unwind[i]); |
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mod->arch.unwind[i] = NULL; |
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} |
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#endif |
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} |
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void __weak module_arch_freeing_init(struct module *mod) |
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{ |
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#ifdef CONFIG_ARM_UNWIND |
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unwind_table_del(mod->arch.unwind[ARM_SEC_INIT]); |
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mod->arch.unwind[ARM_SEC_INIT] = NULL; |
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#endif |
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}
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