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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105// SPDX-License-Identifier: GPL-2.0+/* Kernel module help for SH.
SHcompact version by Kaz Kojima and Paul Mundt.
SHmedia bits:
Copyright 2004 SuperH (UK) Ltd Author: Richard Curnow
Based on the sh version, and on code from the sh64-specific parts of modutils, originally written by Richard Curnow and Ben Gaster.*/#include <linux/moduleloader.h>#include <linux/elf.h>#include <linux/vmalloc.h>#include <linux/bug.h>#include <linux/fs.h>#include <linux/string.h>#include <linux/kernel.h>#include <linux/unaligned.h>#include <asm/dwarf.h>
int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *me){ unsigned int i; Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; Elf32_Sym *sym; Elf32_Addr relocation; uint32_t *location; uint32_t value;
pr_debug("Applying relocate section %u to %u\n", relsec, sechdrs[relsec].sh_info); for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { /* This is where to make the change */ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset; /* This is the symbol it is referring to. Note that all undefined symbols have been resolved. */ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + ELF32_R_SYM(rel[i].r_info); relocation = sym->st_value + rel[i].r_addend;
switch (ELF32_R_TYPE(rel[i].r_info)) { case R_SH_NONE: break; case R_SH_DIR32: value = get_unaligned(location); value += relocation; put_unaligned(value, location); break; case R_SH_REL32: relocation = (relocation - (Elf32_Addr) location); value = get_unaligned(location); value += relocation; put_unaligned(value, location); break; case R_SH_IMM_LOW16: *location = (*location & ~0x3fffc00) | ((relocation & 0xffff) << 10); break; case R_SH_IMM_MEDLOW16: *location = (*location & ~0x3fffc00) | (((relocation >> 16) & 0xffff) << 10); break; case R_SH_IMM_LOW16_PCREL: relocation -= (Elf32_Addr) location; *location = (*location & ~0x3fffc00) | ((relocation & 0xffff) << 10); break; case R_SH_IMM_MEDLOW16_PCREL: relocation -= (Elf32_Addr) location; *location = (*location & ~0x3fffc00) | (((relocation >> 16) & 0xffff) << 10); break; default: printk(KERN_ERR "module %s: Unknown relocation: %u\n", me->name, ELF32_R_TYPE(rel[i].r_info)); return -ENOEXEC; } } return 0;}
int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *me){ int ret = 0;
ret |= module_dwarf_finalize(hdr, sechdrs, me);
return ret;}
void module_arch_cleanup(struct module *mod){ module_dwarf_cleanup(mod);}