[J-u-boot.git] / arch / x86 / lib / relocate.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2008-2011
 * Graeme Russ, <[email protected]>
 *
 * (C) Copyright 2002
 * Daniel Engström, Omicron Ceti AB, <[email protected]>
 *
 * (C) Copyright 2002
 * Wolfgang Denk, DENX Software Engineering, <[email protected]>
 *
 * (C) Copyright 2002
 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
 * Marius Groeger <[email protected]>
 */

#include <common.h>
#include <log.h>
#include <relocate.h>
#include <asm/global_data.h>
#include <asm/u-boot-x86.h>
#include <asm/sections.h>
#include <elf.h>

DECLARE_GLOBAL_DATA_PTR;

int copy_uboot_to_ram(void)
{
	size_t len = (uintptr_t)&__data_end - (uintptr_t)&__text_start;

	if (gd->flags & GD_FLG_SKIP_RELOC)
		return 0;
	memcpy((void *)gd->relocaddr, (void *)&__text_start, len);

	return 0;
}

int clear_bss(void)
{
	ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
	size_t len = (uintptr_t)&__bss_end - (uintptr_t)&__bss_start;

	if (gd->flags & GD_FLG_SKIP_RELOC)
		return 0;
	memset((void *)dst_addr, 0x00, len);

	return 0;
}

#if CONFIG_IS_ENABLED(X86_64)
static void do_elf_reloc_fixups64(unsigned int text_base, uintptr_t size,
				  Elf64_Rela *re_src, Elf64_Rela *re_end)
{
	Elf64_Addr *offset_ptr_rom, *last_offset = NULL;
	Elf64_Addr *offset_ptr_ram;

	do {
		unsigned long long type = ELF64_R_TYPE(re_src->r_info);

		if (type != R_X86_64_RELATIVE) {
			printf("%s: unsupported relocation type 0x%llx "
			       "at %p, ", __func__, type, re_src);
			printf("offset = 0x%llx\n", re_src->r_offset);
			continue;
		}

		/* Get the location from the relocation entry */
		offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;

		/* Check that the location of the relocation is in .text */
		if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base &&
		    offset_ptr_rom > last_offset) {
			/* Switch to the in-RAM version */
			offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom +
							gd->reloc_off);

			/* Check that the target points into .text */
			if (*offset_ptr_ram >= text_base &&
			    *offset_ptr_ram <= text_base + size) {
				*offset_ptr_ram = gd->reloc_off +
							re_src->r_addend;
			} else {
				debug("   %p: %lx: rom reloc %lx, ram %p, value %lx, limit %lX\n",
				      re_src, (ulong)re_src->r_info,
				      (ulong)re_src->r_offset, offset_ptr_ram,
				      (ulong)*offset_ptr_ram, text_base + size);
			}
		} else {
			debug("   %p: %lx: rom reloc %lx, last %p\n", re_src,
			      (ulong)re_src->r_info, (ulong)re_src->r_offset,
			      last_offset);
		}
		last_offset = offset_ptr_rom;

	} while (++re_src < re_end);
}
#else
static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
				  Elf32_Rel *re_src, Elf32_Rel *re_end)
{
	Elf32_Addr *offset_ptr_rom, *last_offset = NULL;
	Elf32_Addr *offset_ptr_ram;

	do {
		unsigned int type = ELF32_R_TYPE(re_src->r_info);

		if (type != R_386_RELATIVE) {
			printf("%s: unsupported relocation type 0x%x "
			       "at %p, ", __func__, type, re_src);
			printf("offset = 0x%x\n", re_src->r_offset);
			continue;
		}

		/* Get the location from the relocation entry */
		offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset;

		/* Check that the location of the relocation is in .text */
		if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base &&
		    offset_ptr_rom > last_offset) {

			/* Switch to the in-RAM version */
			offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
							gd->reloc_off);

			/* Check that the target points into .text */
			if (*offset_ptr_ram >= text_base &&
			    *offset_ptr_ram <= text_base + size) {
				*offset_ptr_ram += gd->reloc_off;
			} else {
				debug("   %p: rom reloc %x, ram %p, value %x, limit %lX\n",
				      re_src, re_src->r_offset, offset_ptr_ram,
				      *offset_ptr_ram, text_base + size);
			}
		} else {
			debug("   %p: rom reloc %x, last %p\n", re_src,
			       re_src->r_offset, last_offset);
		}
		last_offset = offset_ptr_rom;

	} while (++re_src < re_end);
}
#endif

/*
 * This function has more error checking than you might expect. Please see
 * this commit message for more information:
 *    62f7970a x86: Add error checking to x86 relocation code
 */
int do_elf_reloc_fixups(void)
{
	void *re_src = (void *)(&__rel_dyn_start);
	void *re_end = (void *)(&__rel_dyn_end);
	uint text_base;

	/* The size of the region of u-boot that runs out of RAM. */
	uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;

	if (gd->flags & GD_FLG_SKIP_RELOC)
		return 0;
	if (re_src == re_end)
		panic("No relocation data");

#ifdef CONFIG_SYS_TEXT_BASE
	text_base = CONFIG_SYS_TEXT_BASE;
#else
	panic("No CONFIG_SYS_TEXT_BASE");
#endif
#if CONFIG_IS_ENABLED(X86_64)
	do_elf_reloc_fixups64(text_base, size, re_src, re_end);
#else
	do_elf_reloc_fixups32(text_base, size, re_src, re_end);
#endif

	return 0;
}
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
b156ff09 GR	2	/*
	3	* (C) Copyright 2008-2011
	4	* Graeme Russ, <[email protected]>
	5	*
	6	* (C) Copyright 2002
	7	* Daniel Engström, Omicron Ceti AB, <[email protected]>
	8	*
	9	* (C) Copyright 2002
	10	* Wolfgang Denk, DENX Software Engineering, <[email protected]>
	11	*
	12	* (C) Copyright 2002
	13	* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
	14	* Marius Groeger <[email protected]>
b156ff09 GR	15	*/
	16
	17	#include <common.h>
f7ae49fc	18	#include <log.h>
e47b2d67	19	#include <relocate.h>
401d1c4f	20	#include <asm/global_data.h>
b156ff09	21	#include <asm/u-boot-x86.h>
86cfb6bd	22	#include <asm/sections.h>
b156ff09 GR	23	#include <elf.h>
b156ff09 GR	24
7282d834 SG	25	DECLARE_GLOBAL_DATA_PTR;
7282d834 SG	26
a1d57b7a	27	int copy_uboot_to_ram(void)
b156ff09	28	{
f196bd21	29	size_t len = (uintptr_t)&__data_end - (uintptr_t)&__text_start;
b156ff09	30
981dca69 SG	31	if (gd->flags & GD_FLG_SKIP_RELOC)
981dca69 SG	32	return 0;
b156ff09 GR	33	memcpy((void )gd->relocaddr, (void )&__text_start, len);
	34
	35	return 0;
	36	}
	37
a1d57b7a	38	int clear_bss(void)
b156ff09 GR	39	{
b156ff09 GR	40	ulong dst_addr = (ulong)&__bss_start + gd->reloc_off;
f196bd21	41	size_t len = (uintptr_t)&__bss_end - (uintptr_t)&__bss_start;
b156ff09	42
981dca69 SG	43	if (gd->flags & GD_FLG_SKIP_RELOC)
981dca69 SG	44	return 0;
b156ff09 GR	45	memset((void *)dst_addr, 0x00, len);
	46
	47	return 0;
	48	}
	49
b50b1633 SG	50	#if CONFIG_IS_ENABLED(X86_64)
	51	static void do_elf_reloc_fixups64(unsigned int text_base, uintptr_t size,
	52	Elf64_Rela re_src, Elf64_Rela re_end)
	53	{
	54	Elf64_Addr offset_ptr_rom, last_offset = NULL;
	55	Elf64_Addr *offset_ptr_ram;
	56
	57	do {
80df194f HS	58	unsigned long long type = ELF64_R_TYPE(re_src->r_info);
	59
	60	if (type != R_X86_64_RELATIVE) {
	61	printf("%s: unsupported relocation type 0x%llx "
	62	"at %p, ", __func__, type, re_src);
	63	printf("offset = 0x%llx\n", re_src->r_offset);
	64	continue;
	65	}
	66
b50b1633 SG	67	/* Get the location from the relocation entry */
	68	offset_ptr_rom = (Elf64_Addr *)(uintptr_t)re_src->r_offset;
	69
	70	/* Check that the location of the relocation is in .text */
	71	if (offset_ptr_rom >= (Elf64_Addr *)(uintptr_t)text_base &&
	72	offset_ptr_rom > last_offset) {
	73	/* Switch to the in-RAM version */
	74	offset_ptr_ram = (Elf64_Addr *)((ulong)offset_ptr_rom +
	75	gd->reloc_off);
	76
	77	/* Check that the target points into .text */
	78	if (*offset_ptr_ram >= text_base &&
	79	*offset_ptr_ram <= text_base + size) {
	80	*offset_ptr_ram = gd->reloc_off +
	81	re_src->r_addend;
	82	} else {
dee37fc9	83	debug(" %p: %lx: rom reloc %lx, ram %p, value %lx, limit %lX\n",
b50b1633 SG	84	re_src, (ulong)re_src->r_info,
	85	(ulong)re_src->r_offset, offset_ptr_ram,
	86	(ulong)*offset_ptr_ram, text_base + size);
	87	}
	88	} else {
	89	debug(" %p: %lx: rom reloc %lx, last %p\n", re_src,
	90	(ulong)re_src->r_info, (ulong)re_src->r_offset,
	91	last_offset);
	92	}
	93	last_offset = offset_ptr_rom;
	94
	95	} while (++re_src < re_end);
	96	}
	97	#else
dc7e2133 SG	98	static void do_elf_reloc_fixups32(unsigned int text_base, uintptr_t size,
dc7e2133 SG	99	Elf32_Rel re_src, Elf32_Rel re_end)
b156ff09	100	{
62f7970a	101	Elf32_Addr offset_ptr_rom, last_offset = NULL;
b156ff09	102	Elf32_Addr *offset_ptr_ram;
512e581c	103
b156ff09	104	do {
80df194f HS	105	unsigned int type = ELF32_R_TYPE(re_src->r_info);
	106
	107	if (type != R_386_RELATIVE) {
	108	printf("%s: unsupported relocation type 0x%x "
	109	"at %p, ", __func__, type, re_src);
	110	printf("offset = 0x%x\n", re_src->r_offset);
	111	continue;
	112	}
	113
b156ff09	114	/* Get the location from the relocation entry */
dc7e2133	115	offset_ptr_rom = (Elf32_Addr *)(uintptr_t)re_src->r_offset;
b156ff09 GR	116
b156ff09 GR	117	/* Check that the location of the relocation is in .text */
dc7e2133	118	if (offset_ptr_rom >= (Elf32_Addr *)(uintptr_t)text_base &&
a42bfe02	119	offset_ptr_rom > last_offset) {
b156ff09 GR	120
	121	/* Switch to the in-RAM version */
	122	offset_ptr_ram = (Elf32_Addr *)((ulong)offset_ptr_rom +
	123	gd->reloc_off);
	124
	125	/* Check that the target points into .text */
a42bfe02 SG	126	if (*offset_ptr_ram >= text_base &&
a42bfe02 SG	127	*offset_ptr_ram <= text_base + size) {
b156ff09	128	*offset_ptr_ram += gd->reloc_off;
62f7970a	129	} else {
dee37fc9 MY	130	debug(" %p: rom reloc %x, ram %p, value %x, limit %lX\n",
	131	re_src, re_src->r_offset, offset_ptr_ram,
	132	*offset_ptr_ram, text_base + size);
b156ff09	133	}
62f7970a SG	134	} else {
	135	debug(" %p: rom reloc %x, last %p\n", re_src,
	136	re_src->r_offset, last_offset);
b156ff09	137	}
62f7970a SG	138	last_offset = offset_ptr_rom;
62f7970a SG	139
0c392909	140	} while (++re_src < re_end);
dc7e2133	141	}
b50b1633	142	#endif
dc7e2133 SG	143
	144	/*
	145	* This function has more error checking than you might expect. Please see
	146	* this commit message for more information:
	147	* 62f7970a x86: Add error checking to x86 relocation code
	148	*/
	149	int do_elf_reloc_fixups(void)
	150	{
	151	void re_src = (void )(&__rel_dyn_start);
	152	void re_end = (void )(&__rel_dyn_end);
	153	uint text_base;
	154
	155	/* The size of the region of u-boot that runs out of RAM. */
	156	uintptr_t size = (uintptr_t)&__bss_end - (uintptr_t)&__text_start;
	157
	158	if (gd->flags & GD_FLG_SKIP_RELOC)
	159	return 0;
	160	if (re_src == re_end)
	161	panic("No relocation data");
	162
	163	#ifdef CONFIG_SYS_TEXT_BASE
	164	text_base = CONFIG_SYS_TEXT_BASE;
	165	#else
	166	panic("No CONFIG_SYS_TEXT_BASE");
	167	#endif
b50b1633 SG	168	#if CONFIG_IS_ENABLED(X86_64)
	169	do_elf_reloc_fixups64(text_base, size, re_src, re_end);
	170	#else
dc7e2133	171	do_elf_reloc_fixups32(text_base, size, re_src, re_end);
b50b1633	172	#endif
b156ff09 GR	173
	174	return 0;
	175	}