cregit-Linux how code gets into the kernel

Release 4.7 arch/score/kernel/module.c

/*
 * arch/score/kernel/module.c
 *
 * Score Processor version.
 *
 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
 *  Chen Liqin <liqin.chen@sunplusct.com>
 *  Lennox Wu <lennox.wu@sunplusct.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/moduleloader.h>
#include <linux/module.h>
#include <linux/vmalloc.h>


int apply_relocate(Elf_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relindex, struct module *me) { Elf32_Shdr *symsec = sechdrs + symindex; Elf32_Shdr *relsec = sechdrs + relindex; Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; Elf32_Rel *rel = (void *)relsec->sh_addr; unsigned int i; for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { unsigned long loc; Elf32_Sym *sym; s32 r_offset; r_offset = ELF32_R_SYM(rel->r_info); if ((r_offset < 0) || (r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) { printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", me->name, relindex, i); return -ENOEXEC; } sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset; if ((rel->r_offset < 0) || (rel->r_offset > dstsec->sh_size - sizeof(u32))) { printk(KERN_ERR "%s: out of bounds relocation, " "section %d reloc %d offset %d size %d\n", me->name, relindex, i, rel->r_offset, dstsec->sh_size); return -ENOEXEC; } loc = dstsec->sh_addr + rel->r_offset; switch (ELF32_R_TYPE(rel->r_info)) { case R_SCORE_NONE: break; case R_SCORE_ABS32: *(unsigned long *)loc += sym->st_value; break; case R_SCORE_HI16: break; case R_SCORE_LO16: { unsigned long hi16_offset, offset; unsigned long uvalue; unsigned long temp, temp_hi; temp_hi = *((unsigned long *)loc - 1); temp = *(unsigned long *)loc; hi16_offset = (((((temp_hi) >> 16) & 0x3) << 15) | ((temp_hi) & 0x7fff)) >> 1; offset = ((temp >> 16 & 0x03) << 15) | ((temp & 0x7fff) >> 1); offset = (hi16_offset << 16) | (offset & 0xffff); uvalue = sym->st_value + offset; hi16_offset = (uvalue >> 16) << 1; temp_hi = ((temp_hi) & (~(0x37fff))) | (hi16_offset & 0x7fff) | ((hi16_offset << 1) & 0x30000); *((unsigned long *)loc - 1) = temp_hi; offset = (uvalue & 0xffff) << 1; temp = (temp & (~(0x37fff))) | (offset & 0x7fff) | ((offset << 1) & 0x30000); *(unsigned long *)loc = temp; break; } case R_SCORE_24: { unsigned long hi16_offset, offset; unsigned long uvalue; unsigned long temp; temp = *(unsigned long *)loc; offset = (temp & 0x03FF7FFE); hi16_offset = (offset & 0xFFFF0000); offset = (hi16_offset | ((offset & 0xFFFF) << 1)) >> 2; uvalue = (sym->st_value + offset) >> 1; uvalue = uvalue & 0x00ffffff; temp = (temp & 0xfc008001) | ((uvalue << 2) & 0x3ff0000) | ((uvalue & 0x3fff) << 1); *(unsigned long *)loc = temp; break; } default: printk(KERN_ERR "%s: unknown relocation: %u\n", me->name, ELF32_R_TYPE(rel->r_info)); return -ENOEXEC; } } return 0; }

Contributors

PersonTokensPropCommitsCommitProp
chen liqinchen liqin63699.22%150.00%
arnd bergmannarnd bergmann50.78%150.00%
Total641100.00%2100.00%

/* Given an address, look for it in the module exception tables. */
const struct exception_table_entry *search_module_dbetables(unsigned long addr) { return NULL; }

Contributors

PersonTokensPropCommitsCommitProp
chen liqinchen liqin1493.33%150.00%
arnd bergmannarnd bergmann16.67%150.00%
Total15100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
chen liqinchen liqin65898.65%133.33%
arnd bergmannarnd bergmann91.35%266.67%
Total667100.00%3100.00%
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