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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150// SPDX-License-Identifier: GPL-2.0-only/* * Kernel module loader for Hexagon * * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. */
#include <asm/module.h>#include <linux/elf.h>#include <linux/module.h>#include <linux/moduleloader.h>#include <linux/vmalloc.h>
#if 0#define DEBUGP printk#else#define DEBUGP(fmt , ...)#endif
/* * module_frob_arch_sections - tweak got/plt sections. * @hdr - pointer to elf header * @sechdrs - pointer to elf load section headers * @secstrings - symbol names * @mod - pointer to module */int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, char *secstrings, struct module *mod){ unsigned int i; int found = 0;
/* Look for .plt and/or .got.plt and/or .init.plt sections */ for (i = 0; i < hdr->e_shnum; i++) { DEBUGP("Section %d is %s\n", i, secstrings + sechdrs[i].sh_name); if (strcmp(secstrings + sechdrs[i].sh_name, ".plt") == 0) found = i+1; if (strcmp(secstrings + sechdrs[i].sh_name, ".got.plt") == 0) found = i+1; if (strcmp(secstrings + sechdrs[i].sh_name, ".rela.plt") == 0) found = i+1; }
/* At this time, we don't support modules comiled with -shared */ if (found) { printk(KERN_WARNING "Module '%s' contains unexpected .plt/.got sections.\n", mod->name); /* return -ENOEXEC; */ }
return 0;}
/* * apply_relocate_add - perform rela relocations. * @sechdrs - pointer to section headers * @strtab - some sort of start address? * @symindex - symbol index offset or something? * @relsec - address to relocate to? * @module - pointer to module * * Perform rela relocations. */int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *module){ unsigned int i; Elf32_Sym *sym; uint32_t *location; uint32_t value; unsigned int nrelocs = sechdrs[relsec].sh_size / sizeof(Elf32_Rela); Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; Elf32_Word sym_info = sechdrs[relsec].sh_info; Elf32_Sym *sym_base = (Elf32_Sym *) sechdrs[symindex].sh_addr; void *loc_base = (void *) sechdrs[sym_info].sh_addr;
DEBUGP("Applying relocations in section %u to section %u base=%p\n", relsec, sym_info, loc_base);
for (i = 0; i < nrelocs; i++) {
/* Symbol to relocate */ sym = sym_base + ELF32_R_SYM(rela[i].r_info);
/* Where to make the change */ location = loc_base + rela[i].r_offset;
/* `Everything is relative'. */ value = sym->st_value + rela[i].r_addend;
DEBUGP("%d: value=%08x loc=%p reloc=%d symbol=%s\n", i, value, location, ELF32_R_TYPE(rela[i].r_info), sym->st_name ? &strtab[sym->st_name] : "(anonymous)");
switch (ELF32_R_TYPE(rela[i].r_info)) { case R_HEXAGON_B22_PCREL: { int dist = (int)(value - (uint32_t)location); if ((dist < -0x00800000) || (dist >= 0x00800000)) { printk(KERN_ERR "%s: %s: %08x=%08x-%08x %s\n", module->name, "R_HEXAGON_B22_PCREL reloc out of range", dist, value, (uint32_t)location, sym->st_name ? &strtab[sym->st_name] : "(anonymous)"); return -ENOEXEC; } DEBUGP("B22_PCREL contents: %08X.\n", *location); *location &= ~0x01ff3fff; *location |= 0x00003fff & dist; *location |= 0x01ff0000 & (dist<<2); DEBUGP("Contents after reloc: %08x\n", *location); break; } case R_HEXAGON_HI16: value = (value>>16) & 0xffff; fallthrough; case R_HEXAGON_LO16: *location &= ~0x00c03fff; *location |= value & 0x3fff; *location |= (value & 0xc000) << 8; break; case R_HEXAGON_32: *location = value; break; case R_HEXAGON_32_PCREL: *location = value - (uint32_t)location; break; case R_HEXAGON_PLT_B22_PCREL: case R_HEXAGON_GOTOFF_LO16: case R_HEXAGON_GOTOFF_HI16: printk(KERN_ERR "%s: GOT/PLT relocations unsupported\n", module->name); return -ENOEXEC; default: printk(KERN_ERR "%s: unknown relocation: %u\n", module->name, ELF32_R_TYPE(rela[i].r_info)); return -ENOEXEC; } } return 0;}