From c9a4a8da6baae475994974398ff2eba8e92971d1 Mon Sep 17 00:00:00 2001 From: Greentime Hu Date: Wed, 25 Oct 2017 14:37:17 +0800 Subject: nds32: Loadable modules This patch adds support for loadable modules. Signed-off-by: Vincent Chen Signed-off-by: Greentime Hu Acked-by: Arnd Bergmann --- arch/nds32/kernel/module.c | 278 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 278 insertions(+) create mode 100644 arch/nds32/kernel/module.c (limited to 'arch/nds32/kernel/module.c') diff --git a/arch/nds32/kernel/module.c b/arch/nds32/kernel/module.c new file mode 100644 index 000000000000..4167283d8293 --- /dev/null +++ b/arch/nds32/kernel/module.c @@ -0,0 +1,278 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2005-2017 Andes Technology Corporation + +#include +#include +#include +#include +#include + +void *module_alloc(unsigned long size) +{ + return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, + GFP_KERNEL, PAGE_KERNEL, 0, NUMA_NO_NODE, + __builtin_return_address(0)); +} + +void module_free(struct module *module, void *region) +{ + vfree(region); +} + +int module_frob_arch_sections(Elf_Ehdr * hdr, + Elf_Shdr * sechdrs, + char *secstrings, struct module *mod) +{ + return 0; +} + +void do_reloc16(unsigned int val, unsigned int *loc, unsigned int val_mask, + unsigned int val_shift, unsigned int loc_mask, + unsigned int partial_in_place, unsigned int swap) +{ + unsigned int tmp = 0, tmp2 = 0; + + __asm__ __volatile__("\tlhi.bi\t%0, [%2], 0\n" + "\tbeqz\t%3, 1f\n" + "\twsbh\t%0, %1\n" + "1:\n":"=r"(tmp):"0"(tmp), "r"(loc), "r"(swap) + ); + + tmp2 = tmp & loc_mask; + if (partial_in_place) { + tmp &= (!loc_mask); + tmp = + tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask); + } else { + tmp = tmp2 | ((val & val_mask) >> val_shift); + } + + __asm__ __volatile__("\tbeqz\t%3, 2f\n" + "\twsbh\t%0, %1\n" + "2:\n" + "\tshi.bi\t%0, [%2], 0\n":"=r"(tmp):"0"(tmp), + "r"(loc), "r"(swap) + ); +} + +void do_reloc32(unsigned int val, unsigned int *loc, unsigned int val_mask, + unsigned int val_shift, unsigned int loc_mask, + unsigned int partial_in_place, unsigned int swap) +{ + unsigned int tmp = 0, tmp2 = 0; + + __asm__ __volatile__("\tlmw.bi\t%0, [%2], %0, 0\n" + "\tbeqz\t%3, 1f\n" + "\twsbh\t%0, %1\n" + "\trotri\t%0, %1, 16\n" + "1:\n":"=r"(tmp):"0"(tmp), "r"(loc), "r"(swap) + ); + + tmp2 = tmp & loc_mask; + if (partial_in_place) { + tmp &= (!loc_mask); + tmp = + tmp2 | ((tmp + ((val & val_mask) >> val_shift)) & val_mask); + } else { + tmp = tmp2 | ((val & val_mask) >> val_shift); + } + + __asm__ __volatile__("\tbeqz\t%3, 2f\n" + "\twsbh\t%0, %1\n" + "\trotri\t%0, %1, 16\n" + "2:\n" + "\tsmw.bi\t%0, [%2], %0, 0\n":"=r"(tmp):"0"(tmp), + "r"(loc), "r"(swap) + ); +} + +static inline int exceed_limit(int offset, unsigned int val_mask, + struct module *module, Elf32_Rela * rel, + unsigned int relindex, unsigned int reloc_order) +{ + int abs_off = offset < 0 ? ~offset : offset; + + if (abs_off & (~val_mask)) { + pr_err("\n%s: relocation type %d out of range.\n" + "please rebuild the kernel module with gcc option \"-Wa,-mno-small-text\".\n", + module->name, ELF32_R_TYPE(rel->r_info)); + pr_err("section %d reloc %d offset 0x%x relative 0x%x.\n", + relindex, reloc_order, rel->r_offset, offset); + return true; + } + return false; +} + +#ifdef __NDS32_EL__ +#define NEED_SWAP 1 +#else +#define NEED_SWAP 0 +#endif + +int +apply_relocate_add(Elf32_Shdr * sechdrs, const char *strtab, + unsigned int symindex, unsigned int relindex, + struct module *module) +{ + Elf32_Shdr *symsec = sechdrs + symindex; + Elf32_Shdr *relsec = sechdrs + relindex; + Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; + Elf32_Rela *rel = (void *)relsec->sh_addr; + unsigned int i; + + for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rela); i++, rel++) { + Elf32_Addr *loc; + Elf32_Sym *sym; + Elf32_Addr v; + s32 offset; + + offset = ELF32_R_SYM(rel->r_info); + if (offset < 0 + || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { + pr_err("%s: bad relocation\n", module->name); + pr_err("section %d reloc %d\n", relindex, i); + return -ENOEXEC; + } + + sym = ((Elf32_Sym *) symsec->sh_addr) + offset; + + if (rel->r_offset < 0 + || rel->r_offset > dstsec->sh_size - sizeof(u16)) { + pr_err("%s: out of bounds relocation\n", module->name); + pr_err("section %d reloc %d offset 0x%0x size %d\n", + relindex, i, rel->r_offset, dstsec->sh_size); + return -ENOEXEC; + } + + loc = (Elf32_Addr *) (dstsec->sh_addr + rel->r_offset); + v = sym->st_value + rel->r_addend; + + switch (ELF32_R_TYPE(rel->r_info)) { + case R_NDS32_NONE: + case R_NDS32_INSN16: + case R_NDS32_LABEL: + case R_NDS32_LONGCALL1: + case R_NDS32_LONGCALL2: + case R_NDS32_LONGCALL3: + case R_NDS32_LONGCALL4: + case R_NDS32_LONGJUMP1: + case R_NDS32_LONGJUMP2: + case R_NDS32_LONGJUMP3: + case R_NDS32_9_FIXED_RELA: + case R_NDS32_15_FIXED_RELA: + case R_NDS32_17_FIXED_RELA: + case R_NDS32_25_FIXED_RELA: + case R_NDS32_LOADSTORE: + case R_NDS32_DWARF2_OP1_RELA: + case R_NDS32_DWARF2_OP2_RELA: + case R_NDS32_DWARF2_LEB_RELA: + case R_NDS32_RELA_NOP_MIX ... R_NDS32_RELA_NOP_MAX: + break; + + case R_NDS32_32_RELA: + do_reloc32(v, loc, 0xffffffff, 0, 0, 0, 0); + break; + + case R_NDS32_HI20_RELA: + do_reloc32(v, loc, 0xfffff000, 12, 0xfff00000, 0, + NEED_SWAP); + break; + + case R_NDS32_LO12S3_RELA: + do_reloc32(v, loc, 0x00000fff, 3, 0xfffff000, 0, + NEED_SWAP); + break; + + case R_NDS32_LO12S2_RELA: + do_reloc32(v, loc, 0x00000fff, 2, 0xfffff000, 0, + NEED_SWAP); + break; + + case R_NDS32_LO12S1_RELA: + do_reloc32(v, loc, 0x00000fff, 1, 0xfffff000, 0, + NEED_SWAP); + break; + + case R_NDS32_LO12S0_RELA: + case R_NDS32_LO12S0_ORI_RELA: + do_reloc32(v, loc, 0x00000fff, 0, 0xfffff000, 0, + NEED_SWAP); + break; + + case R_NDS32_9_PCREL_RELA: + if (exceed_limit + ((v - (Elf32_Addr) loc), 0x000000ff, module, rel, + relindex, i)) + return -ENOEXEC; + do_reloc16(v - (Elf32_Addr) loc, loc, 0x000001ff, 1, + 0xffffff00, 0, NEED_SWAP); + break; + + case R_NDS32_15_PCREL_RELA: + if (exceed_limit + ((v - (Elf32_Addr) loc), 0x00003fff, module, rel, + relindex, i)) + return -ENOEXEC; + do_reloc32(v - (Elf32_Addr) loc, loc, 0x00007fff, 1, + 0xffffc000, 0, NEED_SWAP); + break; + + case R_NDS32_17_PCREL_RELA: + if (exceed_limit + ((v - (Elf32_Addr) loc), 0x0000ffff, module, rel, + relindex, i)) + return -ENOEXEC; + do_reloc32(v - (Elf32_Addr) loc, loc, 0x0001ffff, 1, + 0xffff0000, 0, NEED_SWAP); + break; + + case R_NDS32_25_PCREL_RELA: + if (exceed_limit + ((v - (Elf32_Addr) loc), 0x00ffffff, module, rel, + relindex, i)) + return -ENOEXEC; + do_reloc32(v - (Elf32_Addr) loc, loc, 0x01ffffff, 1, + 0xff000000, 0, NEED_SWAP); + break; + case R_NDS32_WORD_9_PCREL_RELA: + if (exceed_limit + ((v - (Elf32_Addr) loc), 0x000000ff, module, rel, + relindex, i)) + return -ENOEXEC; + do_reloc32(v - (Elf32_Addr) loc, loc, 0x000001ff, 1, + 0xffffff00, 0, NEED_SWAP); + break; + + case R_NDS32_SDA15S3_RELA: + case R_NDS32_SDA15S2_RELA: + case R_NDS32_SDA15S1_RELA: + case R_NDS32_SDA15S0_RELA: + pr_err("%s: unsupported relocation type %d.\n", + module->name, ELF32_R_TYPE(rel->r_info)); + pr_err + ("Small data section access doesn't work in the kernel space; " + "please rebuild the kernel module with gcc option -mcmodel=large.\n"); + pr_err("section %d reloc %d offset 0x%x size %d\n", + relindex, i, rel->r_offset, dstsec->sh_size); + break; + + default: + pr_err("%s: unsupported relocation type %d.\n", + module->name, ELF32_R_TYPE(rel->r_info)); + pr_err("section %d reloc %d offset 0x%x size %d\n", + relindex, i, rel->r_offset, dstsec->sh_size); + } + } + return 0; +} + +int +module_finalize(const Elf32_Ehdr * hdr, const Elf_Shdr * sechdrs, + struct module *module) +{ + return 0; +} + +void module_arch_cleanup(struct module *mod) +{ +} -- cgit v1.2.3