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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/microblaze/kernel/module.c
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// SPDX-License-Identifier: GPL-2.0-only

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/*

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 * Copyright (C) 2007-2009 Michal Simek <[email protected]>

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 * Copyright (C) 2007-2009 PetaLogix

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 */

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#include <linux/export.h>

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#include <linux/moduleloader.h>

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#include <linux/kernel.h>

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#include <linux/elf.h>

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#include <linux/vmalloc.h>

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#include <linux/fs.h>

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#include <linux/string.h>

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#include <linux/pgtable.h>

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#include <asm/cacheflush.h>

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int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,

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	unsigned int symindex, unsigned int relsec, struct module *module)

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{

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	unsigned int i;

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	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;

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	Elf32_Sym *sym;

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	unsigned long int *location;

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	unsigned long int value;

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	pr_debug("Applying add relocation section %u to %u\n",

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		relsec, sechdrs[relsec].sh_info);

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	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {

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		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +

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				rela[i].r_offset;

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		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +

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			ELF32_R_SYM(rela[i].r_info);

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		value = sym->st_value + rela[i].r_addend;

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		switch (ELF32_R_TYPE(rela[i].r_info)) {

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		/*

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		 * Be careful! mb-gcc / mb-ld splits the relocs between the

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		 * text and the reloc table. In general this means we must

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		 * read the current contents of (*location), add any offset

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		 * then store the result back in

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		 */

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		case R_MICROBLAZE_32:

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			*location = value;

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			break;

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		case R_MICROBLAZE_64:

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			location[0] = (location[0] & 0xFFFF0000) |

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					(value >> 16);

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			location[1] = (location[1] & 0xFFFF0000) |

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					(value & 0xFFFF);

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			break;

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		case R_MICROBLAZE_64_PCREL:

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			value -= (unsigned long int)(location) + 4;

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			location[0] = (location[0] & 0xFFFF0000) |

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					(value >> 16);

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			location[1] = (location[1] & 0xFFFF0000) |

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					(value & 0xFFFF);

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			pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",

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				value);

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			break;

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		case R_MICROBLAZE_32_PCREL_LO:

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			pr_debug("R_MICROBLAZE_32_PCREL_LO\n");

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			break;

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		case R_MICROBLAZE_64_NONE:

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			pr_debug("R_MICROBLAZE_64_NONE\n");

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			break;

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		case R_MICROBLAZE_NONE:

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			pr_debug("R_MICROBLAZE_NONE\n");

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			break;

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		default:

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			pr_err("module %s: Unknown relocation: %u\n",

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				module->name,

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				ELF32_R_TYPE(rela[i].r_info));

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			return -ENOEXEC;

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		}

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	}

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	return 0;

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}

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int 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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	flush_dcache();

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	return 0;

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}

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