[linux-2.6-block.git] / arch / microblaze / kernel / module.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
 * Copyright (C) 2007-2009 PetaLogix
 */

#include <linux/export.h>
#include <linux/moduleloader.h>
#include <linux/kernel.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/string.h>

#include <asm/pgtable.h>
#include <asm/cacheflush.h>

int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
	unsigned int symindex, unsigned int relsec, struct module *module)
{

	unsigned int i;
	Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
	Elf32_Sym *sym;
	unsigned long int *location;
	unsigned long int value;
#if __GNUC__ < 4
	unsigned long int old_value;
#endif

	pr_debug("Applying add relocation section %u to %u\n",
		relsec, sechdrs[relsec].sh_info);

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

		location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
				rela[i].r_offset;
		sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
			ELF32_R_SYM(rela[i].r_info);
		value = sym->st_value + rela[i].r_addend;

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

		/*
		 * Be careful! mb-gcc / mb-ld splits the relocs between the
		 * text and the reloc table. In general this means we must
		 * read the current contents of (*location), add any offset
		 * then store the result back in
		 */

		case R_MICROBLAZE_32:
#if __GNUC__ < 4
			old_value = *location;
			*location = value + old_value;

			pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
				old_value, value);
#else
			*location = value;
#endif
			break;

		case R_MICROBLAZE_64:
#if __GNUC__ < 4
			/* Split relocs only required/used pre gcc4.1.1 */
			old_value = ((location[0] & 0x0000FFFF) << 16) |
					(location[1] & 0x0000FFFF);
			value += old_value;
#endif
			location[0] = (location[0] & 0xFFFF0000) |
					(value >> 16);
			location[1] = (location[1] & 0xFFFF0000) |
					(value & 0xFFFF);
#if __GNUC__ < 4
			pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
				old_value, value);
#endif
			break;

		case R_MICROBLAZE_64_PCREL:
#if __GNUC__ < 4
			old_value = (location[0] & 0xFFFF) << 16 |
				(location[1] & 0xFFFF);
			value -= old_value;
#endif
			value -= (unsigned long int)(location) + 4;
			location[0] = (location[0] & 0xFFFF0000) |
					(value >> 16);
			location[1] = (location[1] & 0xFFFF0000) |
					(value & 0xFFFF);
			pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
				value);
			break;

		case R_MICROBLAZE_32_PCREL_LO:
			pr_debug("R_MICROBLAZE_32_PCREL_LO\n");
			break;

		case R_MICROBLAZE_64_NONE:
			pr_debug("R_MICROBLAZE_64_NONE\n");
			break;

		case R_MICROBLAZE_NONE:
			pr_debug("R_MICROBLAZE_NONE\n");
			break;

		default:
			pr_err("module %s: Unknown relocation: %u\n",
				module->name,
				ELF32_R_TYPE(rela[i].r_info));
			return -ENOEXEC;
		}
	}
	return 0;
}

int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
		struct module *module)
{
	flush_dcache();
	return 0;
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
f6b165c6 MS	2	/*
	3	* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
	4	* Copyright (C) 2007-2009 PetaLogix
f6b165c6 MS	5	*/
f6b165c6 MS	6
d64af918	7	#include <linux/export.h>
f6b165c6 MS	8	#include <linux/moduleloader.h>
	9	#include <linux/kernel.h>
	10	#include <linux/elf.h>
	11	#include <linux/vmalloc.h>
f6b165c6 MS	12	#include <linux/fs.h>
	13	#include <linux/string.h>
	14
	15	#include <asm/pgtable.h>
a5e48b88	16	#include <asm/cacheflush.h>
f6b165c6	17
f6b165c6 MS	18	int apply_relocate_add(Elf32_Shdr sechdrs, const char strtab,
	19	unsigned int symindex, unsigned int relsec, struct module *module)
	20	{
	21
	22	unsigned int i;
	23	Elf32_Rela rela = (void )sechdrs[relsec].sh_addr;
	24	Elf32_Sym *sym;
	25	unsigned long int *location;
f6b165c6 MS	26	unsigned long int value;
	27	#if __GNUC__ < 4
	28	unsigned long int old_value;
	29	#endif
	30
	31	pr_debug("Applying add relocation section %u to %u\n",
	32	relsec, sechdrs[relsec].sh_info);
	33
	34	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
	35
	36	location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
	37	rela[i].r_offset;
	38	sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
	39	ELF32_R_SYM(rela[i].r_info);
	40	value = sym->st_value + rela[i].r_addend;
	41
	42	switch (ELF32_R_TYPE(rela[i].r_info)) {
	43
	44	/*
	45	* Be careful! mb-gcc / mb-ld splits the relocs between the
	46	* text and the reloc table. In general this means we must
	47	* read the current contents of (*location), add any offset
	48	* then store the result back in
	49	*/
	50
	51	case R_MICROBLAZE_32:
	52	#if __GNUC__ < 4
	53	old_value = *location;
	54	*location = value + old_value;
	55
	56	pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n",
	57	old_value, value);
	58	#else
	59	*location = value;
	60	#endif
	61	break;
	62
	63	case R_MICROBLAZE_64:
	64	#if __GNUC__ < 4
	65	/* Split relocs only required/used pre gcc4.1.1 */
	66	old_value = ((location[0] & 0x0000FFFF) << 16) \|
	67	(location[1] & 0x0000FFFF);
	68	value += old_value;
	69	#endif
	70	location[0] = (location[0] & 0xFFFF0000) \|
	71	(value >> 16);
	72	location[1] = (location[1] & 0xFFFF0000) \|
	73	(value & 0xFFFF);
	74	#if __GNUC__ < 4
	75	pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n",
	76	old_value, value);
	77	#endif
	78	break;
	79
	80	case R_MICROBLAZE_64_PCREL:
fadf2e60 JW	81	#if __GNUC__ < 4
fadf2e60 JW	82	old_value = (location[0] & 0xFFFF) << 16 \|
f6b165c6	83	(location[1] & 0xFFFF);
fadf2e60 JW	84	value -= old_value;
	85	#endif
	86	value -= (unsigned long int)(location) + 4;
f6b165c6 MS	87	location[0] = (location[0] & 0xFFFF0000) \|
	88	(value >> 16);
	89	location[1] = (location[1] & 0xFFFF0000) \|
	90	(value & 0xFFFF);
	91	pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
	92	value);
	93	break;
	94
fadf2e60 JW	95	case R_MICROBLAZE_32_PCREL_LO:
	96	pr_debug("R_MICROBLAZE_32_PCREL_LO\n");
	97	break;
	98
679711b8	99	case R_MICROBLAZE_64_NONE:
f5b778be	100	pr_debug("R_MICROBLAZE_64_NONE\n");
679711b8 MS	101	break;
679711b8 MS	102
f6b165c6 MS	103	case R_MICROBLAZE_NONE:
	104	pr_debug("R_MICROBLAZE_NONE\n");
	105	break;
	106
	107	default:
6bd55f0b	108	pr_err("module %s: Unknown relocation: %u\n",
f6b165c6	109	module->name,
fadf2e60	110	ELF32_R_TYPE(rela[i].r_info));
f6b165c6 MS	111	return -ENOEXEC;
	112	}
	113	}
	114	return 0;
	115	}
	116
	117	int module_finalize(const Elf32_Ehdr hdr, const Elf_Shdr sechdrs,
	118	struct module *module)
	119	{
a5e48b88	120	flush_dcache();
f6b165c6 MS	121	return 0;
f6b165c6 MS	122	}