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nds32: Loadable modules
This patch adds support for loadable modules. Signed-off-by: Vincent Chen <vincentc@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Greentime Hu
parent
3af6e29254
commit
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2 changed files with 289 additions and 0 deletions
11
arch/nds32/include/asm/module.h
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11
arch/nds32/include/asm/module.h
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#ifndef _ASM_NDS32_MODULE_H
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#define _ASM_NDS32_MODULE_H
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#include <asm-generic/module.h>
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#define MODULE_ARCH_VERMAGIC "NDS32v3"
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#endif /* _ASM_NDS32_MODULE_H */
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278
arch/nds32/kernel/module.c
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arch/nds32/kernel/module.c
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (C) 2005-2017 Andes Technology Corporation
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#include <linux/module.h>
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#include <linux/elf.h>
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#include <linux/vmalloc.h>
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#include <linux/moduleloader.h>
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#include <asm/pgtable.h>
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void *module_alloc(unsigned long size)
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{
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return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
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GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE,
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__builtin_return_address(0));
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}
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void module_free(struct module *module, void *region)
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{
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vfree(region);
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}
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int module_frob_arch_sections(Elf_Ehdr * hdr,
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Elf_Shdr * sechdrs,
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char *secstrings, struct module *mod)
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{
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return 0;
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}
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void do_reloc16(unsigned int val, unsigned int *loc, unsigned int val_mask,
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unsigned int val_shift, unsigned int loc_mask,
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unsigned int partial_in_place, unsigned int swap)
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{
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unsigned int tmp = 0, tmp2 = 0;
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__asm__ __volatile__("\tlhi.bi\t%0, [%2], 0\n"
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"\tbeqz\t%3, 1f\n"
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"\twsbh\t%0, %1\n"
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"1:\n":"=r"(tmp):"0"(tmp), "r"(loc), "r"(swap)
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);
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tmp2 = tmp & loc_mask;
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if (partial_in_place) {
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tmp &= (!loc_mask);
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tmp =
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tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask);
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} else {
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tmp = tmp2 | ((val & val_mask) >> val_shift);
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}
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__asm__ __volatile__("\tbeqz\t%3, 2f\n"
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"\twsbh\t%0, %1\n"
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"2:\n"
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"\tshi.bi\t%0, [%2], 0\n":"=r"(tmp):"0"(tmp),
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"r"(loc), "r"(swap)
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);
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}
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void do_reloc32(unsigned int val, unsigned int *loc, unsigned int val_mask,
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unsigned int val_shift, unsigned int loc_mask,
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unsigned int partial_in_place, unsigned int swap)
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{
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unsigned int tmp = 0, tmp2 = 0;
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__asm__ __volatile__("\tlmw.bi\t%0, [%2], %0, 0\n"
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"\tbeqz\t%3, 1f\n"
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"\twsbh\t%0, %1\n"
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"\trotri\t%0, %1, 16\n"
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"1:\n":"=r"(tmp):"0"(tmp), "r"(loc), "r"(swap)
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);
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tmp2 = tmp & loc_mask;
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if (partial_in_place) {
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tmp &= (!loc_mask);
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tmp =
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tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask);
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} else {
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tmp = tmp2 | ((val & val_mask) >> val_shift);
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}
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__asm__ __volatile__("\tbeqz\t%3, 2f\n"
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"\twsbh\t%0, %1\n"
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"\trotri\t%0, %1, 16\n"
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"2:\n"
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"\tsmw.bi\t%0, [%2], %0, 0\n":"=r"(tmp):"0"(tmp),
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"r"(loc), "r"(swap)
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);
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}
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static inline int exceed_limit(int offset, unsigned int val_mask,
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struct module *module, Elf32_Rela * rel,
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unsigned int relindex, unsigned int reloc_order)
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{
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int abs_off = offset < 0 ? ~offset : offset;
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if (abs_off & (~val_mask)) {
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pr_err("\n%s: relocation type %d out of range.\n"
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"please rebuild the kernel module with gcc option \"-Wa,-mno-small-text\".\n",
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module->name, ELF32_R_TYPE(rel->r_info));
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pr_err("section %d reloc %d offset 0x%x relative 0x%x.\n",
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relindex, reloc_order, rel->r_offset, offset);
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return true;
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}
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return false;
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}
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#ifdef __NDS32_EL__
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#define NEED_SWAP 1
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#else
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#define NEED_SWAP 0
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#endif
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int
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apply_relocate_add(Elf32_Shdr * sechdrs, const char *strtab,
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unsigned int symindex, unsigned int relindex,
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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_Rela *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_Rela); i++, rel++) {
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Elf32_Addr *loc;
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Elf32_Sym *sym;
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Elf32_Addr v;
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s32 offset;
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offset = ELF32_R_SYM(rel->r_info);
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if (offset < 0
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|| offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
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pr_err("%s: bad relocation\n", module->name);
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pr_err("section %d reloc %d\n", 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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if (rel->r_offset < 0
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|| rel->r_offset > dstsec->sh_size - sizeof(u16)) {
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pr_err("%s: out of bounds relocation\n", module->name);
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pr_err("section %d reloc %d offset 0x%0x size %d\n",
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relindex, i, rel->r_offset, dstsec->sh_size);
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return -ENOEXEC;
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}
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loc = (Elf32_Addr *) (dstsec->sh_addr + rel->r_offset);
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v = sym->st_value + rel->r_addend;
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switch (ELF32_R_TYPE(rel->r_info)) {
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case R_NDS32_NONE:
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case R_NDS32_INSN16:
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case R_NDS32_LABEL:
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case R_NDS32_LONGCALL1:
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case R_NDS32_LONGCALL2:
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case R_NDS32_LONGCALL3:
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case R_NDS32_LONGCALL4:
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case R_NDS32_LONGJUMP1:
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case R_NDS32_LONGJUMP2:
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case R_NDS32_LONGJUMP3:
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case R_NDS32_9_FIXED_RELA:
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case R_NDS32_15_FIXED_RELA:
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case R_NDS32_17_FIXED_RELA:
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case R_NDS32_25_FIXED_RELA:
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case R_NDS32_LOADSTORE:
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case R_NDS32_DWARF2_OP1_RELA:
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case R_NDS32_DWARF2_OP2_RELA:
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case R_NDS32_DWARF2_LEB_RELA:
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case R_NDS32_RELA_NOP_MIX ... R_NDS32_RELA_NOP_MAX:
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break;
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case R_NDS32_32_RELA:
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do_reloc32(v, loc, 0xffffffff, 0, 0, 0, 0);
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break;
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case R_NDS32_HI20_RELA:
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do_reloc32(v, loc, 0xfffff000, 12, 0xfff00000, 0,
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NEED_SWAP);
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break;
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case R_NDS32_LO12S3_RELA:
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do_reloc32(v, loc, 0x00000fff, 3, 0xfffff000, 0,
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NEED_SWAP);
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break;
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case R_NDS32_LO12S2_RELA:
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do_reloc32(v, loc, 0x00000fff, 2, 0xfffff000, 0,
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NEED_SWAP);
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break;
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case R_NDS32_LO12S1_RELA:
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do_reloc32(v, loc, 0x00000fff, 1, 0xfffff000, 0,
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NEED_SWAP);
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break;
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case R_NDS32_LO12S0_RELA:
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case R_NDS32_LO12S0_ORI_RELA:
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do_reloc32(v, loc, 0x00000fff, 0, 0xfffff000, 0,
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NEED_SWAP);
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break;
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case R_NDS32_9_PCREL_RELA:
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if (exceed_limit
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((v - (Elf32_Addr) loc), 0x000000ff, module, rel,
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relindex, i))
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return -ENOEXEC;
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do_reloc16(v - (Elf32_Addr) loc, loc, 0x000001ff, 1,
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0xffffff00, 0, NEED_SWAP);
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break;
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case R_NDS32_15_PCREL_RELA:
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if (exceed_limit
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((v - (Elf32_Addr) loc), 0x00003fff, module, rel,
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relindex, i))
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return -ENOEXEC;
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do_reloc32(v - (Elf32_Addr) loc, loc, 0x00007fff, 1,
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0xffffc000, 0, NEED_SWAP);
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break;
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case R_NDS32_17_PCREL_RELA:
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if (exceed_limit
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((v - (Elf32_Addr) loc), 0x0000ffff, module, rel,
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relindex, i))
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return -ENOEXEC;
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do_reloc32(v - (Elf32_Addr) loc, loc, 0x0001ffff, 1,
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0xffff0000, 0, NEED_SWAP);
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break;
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case R_NDS32_25_PCREL_RELA:
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if (exceed_limit
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((v - (Elf32_Addr) loc), 0x00ffffff, module, rel,
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relindex, i))
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return -ENOEXEC;
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do_reloc32(v - (Elf32_Addr) loc, loc, 0x01ffffff, 1,
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0xff000000, 0, NEED_SWAP);
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break;
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case R_NDS32_WORD_9_PCREL_RELA:
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if (exceed_limit
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((v - (Elf32_Addr) loc), 0x000000ff, module, rel,
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relindex, i))
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return -ENOEXEC;
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do_reloc32(v - (Elf32_Addr) loc, loc, 0x000001ff, 1,
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0xffffff00, 0, NEED_SWAP);
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break;
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case R_NDS32_SDA15S3_RELA:
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case R_NDS32_SDA15S2_RELA:
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case R_NDS32_SDA15S1_RELA:
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case R_NDS32_SDA15S0_RELA:
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pr_err("%s: unsupported relocation type %d.\n",
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module->name, ELF32_R_TYPE(rel->r_info));
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pr_err
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("Small data section access doesn't work in the kernel space; "
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"please rebuild the kernel module with gcc option -mcmodel=large.\n");
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pr_err("section %d reloc %d offset 0x%x size %d\n",
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relindex, i, rel->r_offset, dstsec->sh_size);
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break;
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default:
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pr_err("%s: unsupported relocation type %d.\n",
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module->name, ELF32_R_TYPE(rel->r_info));
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pr_err("section %d reloc %d offset 0x%x size %d\n",
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relindex, i, rel->r_offset, dstsec->sh_size);
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}
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}
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return 0;
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}
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int
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module_finalize(const Elf32_Ehdr * hdr, const Elf_Shdr * sechdrs,
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struct module *module)
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{
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return 0;
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}
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void module_arch_cleanup(struct module *mod)
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{
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}
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