[J-u-boot.git] / lib / elf.c

// SPDX-License-Identifier: BSD-2-Clause
/*
   Copyright (c) 2001 William L. Pitts
*/

#include <common.h>
#include <command.h>
#include <cpu_func.h>
#include <elf.h>
#include <env.h>
#include <net.h>
#include <vxworks.h>
#ifdef CONFIG_X86
#include <vbe.h>
#include <asm/e820.h>
#include <linux/linkage.h>
#endif

/*
 * A very simple ELF64 loader, assumes the image is valid, returns the
 * entry point address.
 *
 * Note if U-Boot is 32-bit, the loader assumes the to segment's
 * physical address and size is within the lower 32-bit address space.
 */
unsigned long load_elf64_image_phdr(unsigned long addr)
{
	Elf64_Ehdr *ehdr; /* Elf header structure pointer */
	Elf64_Phdr *phdr; /* Program header structure pointer */
	int i;

	ehdr = (Elf64_Ehdr *)addr;
	phdr = (Elf64_Phdr *)(addr + (ulong)ehdr->e_phoff);

	/* Load each program header */
	for (i = 0; i < ehdr->e_phnum; ++i) {
		void *dst = (void *)(ulong)phdr->p_paddr;
		void *src = (void *)addr + phdr->p_offset;

		debug("Loading phdr %i to 0x%p (%lu bytes)\n",
		      i, dst, (ulong)phdr->p_filesz);
		if (phdr->p_filesz)
			memcpy(dst, src, phdr->p_filesz);
		if (phdr->p_filesz != phdr->p_memsz)
			memset(dst + phdr->p_filesz, 0x00,
			       phdr->p_memsz - phdr->p_filesz);
		flush_cache(rounddown((unsigned long)dst, ARCH_DMA_MINALIGN),
			    roundup(phdr->p_memsz, ARCH_DMA_MINALIGN));
		++phdr;
	}

	if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
					    EF_PPC64_ELFV1_ABI)) {
		/*
		 * For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
		 * descriptor pointer with the first double word being the
		 * address of the entry point of the function.
		 */
		uintptr_t addr = ehdr->e_entry;

		return *(Elf64_Addr *)addr;
	}

	return ehdr->e_entry;
}

unsigned long load_elf64_image_shdr(unsigned long addr)
{
	Elf64_Ehdr *ehdr; /* Elf header structure pointer */
	Elf64_Shdr *shdr; /* Section header structure pointer */
	unsigned char *strtab = 0; /* String table pointer */
	unsigned char *image; /* Binary image pointer */
	int i; /* Loop counter */

	ehdr = (Elf64_Ehdr *)addr;

	/* Find the section header string table for output info */
	shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
			     (ehdr->e_shstrndx * sizeof(Elf64_Shdr)));

	if (shdr->sh_type == SHT_STRTAB)
		strtab = (unsigned char *)(addr + (ulong)shdr->sh_offset);

	/* Load each appropriate section */
	for (i = 0; i < ehdr->e_shnum; ++i) {
		shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
				     (i * sizeof(Elf64_Shdr)));

		if (!(shdr->sh_flags & SHF_ALLOC) ||
		    shdr->sh_addr == 0 || shdr->sh_size == 0) {
			continue;
		}

		if (strtab) {
			debug("%sing %s @ 0x%08lx (%ld bytes)\n",
			      (shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
			       &strtab[shdr->sh_name],
			       (unsigned long)shdr->sh_addr,
			       (long)shdr->sh_size);
		}

		if (shdr->sh_type == SHT_NOBITS) {
			memset((void *)(uintptr_t)shdr->sh_addr, 0,
			       shdr->sh_size);
		} else {
			image = (unsigned char *)addr + (ulong)shdr->sh_offset;
			memcpy((void *)(uintptr_t)shdr->sh_addr,
			       (const void *)image, shdr->sh_size);
		}
		flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
			    roundup((shdr->sh_addr + shdr->sh_size),
				     ARCH_DMA_MINALIGN) -
				rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
	}

	if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
					    EF_PPC64_ELFV1_ABI)) {
		/*
		 * For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
		 * descriptor pointer with the first double word being the
		 * address of the entry point of the function.
		 */
		uintptr_t addr = ehdr->e_entry;

		return *(Elf64_Addr *)addr;
	}

	return ehdr->e_entry;
}

/*
 * A very simple ELF loader, assumes the image is valid, returns the
 * entry point address.
 *
 * The loader firstly reads the EFI class to see if it's a 64-bit image.
 * If yes, call the ELF64 loader. Otherwise continue with the ELF32 loader.
 */
unsigned long load_elf_image_phdr(unsigned long addr)
{
	Elf32_Ehdr *ehdr; /* Elf header structure pointer */
	Elf32_Phdr *phdr; /* Program header structure pointer */
	int i;

	ehdr = (Elf32_Ehdr *)addr;
	if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
		return load_elf64_image_phdr(addr);

	phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);

	/* Load each program header */
	for (i = 0; i < ehdr->e_phnum; ++i) {
		void *dst = (void *)(uintptr_t)phdr->p_paddr;
		void *src = (void *)addr + phdr->p_offset;

		debug("Loading phdr %i to 0x%p (%i bytes)\n",
		      i, dst, phdr->p_filesz);
		if (phdr->p_filesz)
			memcpy(dst, src, phdr->p_filesz);
		if (phdr->p_filesz != phdr->p_memsz)
			memset(dst + phdr->p_filesz, 0x00,
			       phdr->p_memsz - phdr->p_filesz);
		flush_cache(rounddown((unsigned long)dst, ARCH_DMA_MINALIGN),
			    roundup(phdr->p_memsz, ARCH_DMA_MINALIGN));
		++phdr;
	}

	return ehdr->e_entry;
}

unsigned long load_elf_image_shdr(unsigned long addr)
{
	Elf32_Ehdr *ehdr; /* Elf header structure pointer */
	Elf32_Shdr *shdr; /* Section header structure pointer */
	unsigned char *strtab = 0; /* String table pointer */
	unsigned char *image; /* Binary image pointer */
	int i; /* Loop counter */

	ehdr = (Elf32_Ehdr *)addr;
	if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
		return load_elf64_image_shdr(addr);

	/* Find the section header string table for output info */
	shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
			     (ehdr->e_shstrndx * sizeof(Elf32_Shdr)));

	if (shdr->sh_type == SHT_STRTAB)
		strtab = (unsigned char *)(addr + shdr->sh_offset);

	/* Load each appropriate section */
	for (i = 0; i < ehdr->e_shnum; ++i) {
		shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
				     (i * sizeof(Elf32_Shdr)));

		if (!(shdr->sh_flags & SHF_ALLOC) ||
		    shdr->sh_addr == 0 || shdr->sh_size == 0) {
			continue;
		}

		if (strtab) {
			debug("%sing %s @ 0x%08lx (%ld bytes)\n",
			      (shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
			       &strtab[shdr->sh_name],
			       (unsigned long)shdr->sh_addr,
			       (long)shdr->sh_size);
		}

		if (shdr->sh_type == SHT_NOBITS) {
			memset((void *)(uintptr_t)shdr->sh_addr, 0,
			       shdr->sh_size);
		} else {
			image = (unsigned char *)addr + shdr->sh_offset;
			memcpy((void *)(uintptr_t)shdr->sh_addr,
			       (const void *)image, shdr->sh_size);
		}
		flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
			    roundup((shdr->sh_addr + shdr->sh_size),
				    ARCH_DMA_MINALIGN) -
			    rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
	}

	return ehdr->e_entry;
}

/*
 * Determine if a valid ELF image exists at the given memory location.
 * First look at the ELF header magic field, then make sure that it is
 * executable.
 */
int valid_elf_image(unsigned long addr)
{
	Elf32_Ehdr *ehdr; /* Elf header structure pointer */

	ehdr = (Elf32_Ehdr *)addr;

	if (!IS_ELF(*ehdr)) {
		printf("## No elf image at address 0x%08lx\n", addr);
		return 0;
	}

	if (ehdr->e_type != ET_EXEC) {
		printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
		return 0;
	}

	return 1;
}
Commit	Line	Data
805b3cac K	1	// SPDX-License-Identifier: BSD-2-Clause
	2	/*
	3	Copyright (c) 2001 William L. Pitts
	4	*/
	5
	6	#include <common.h>
	7	#include <command.h>
	8	#include <cpu_func.h>
	9	#include <elf.h>
	10	#include <env.h>
	11	#include <net.h>
	12	#include <vxworks.h>
	13	#ifdef CONFIG_X86
	14	#include <vbe.h>
	15	#include <asm/e820.h>
	16	#include <linux/linkage.h>
	17	#endif
	18
	19	/*
	20	* A very simple ELF64 loader, assumes the image is valid, returns the
	21	* entry point address.
	22	*
	23	* Note if U-Boot is 32-bit, the loader assumes the to segment's
	24	* physical address and size is within the lower 32-bit address space.
	25	*/
	26	unsigned long load_elf64_image_phdr(unsigned long addr)
	27	{
	28	Elf64_Ehdr ehdr; / Elf header structure pointer */
	29	Elf64_Phdr phdr; / Program header structure pointer */
	30	int i;
	31
	32	ehdr = (Elf64_Ehdr *)addr;
	33	phdr = (Elf64_Phdr *)(addr + (ulong)ehdr->e_phoff);
	34
	35	/* Load each program header */
	36	for (i = 0; i < ehdr->e_phnum; ++i) {
	37	void dst = (void )(ulong)phdr->p_paddr;
	38	void src = (void )addr + phdr->p_offset;
	39
	40	debug("Loading phdr %i to 0x%p (%lu bytes)\n",
	41	i, dst, (ulong)phdr->p_filesz);
	42	if (phdr->p_filesz)
	43	memcpy(dst, src, phdr->p_filesz);
	44	if (phdr->p_filesz != phdr->p_memsz)
	45	memset(dst + phdr->p_filesz, 0x00,
	46	phdr->p_memsz - phdr->p_filesz);
	47	flush_cache(rounddown((unsigned long)dst, ARCH_DMA_MINALIGN),
	48	roundup(phdr->p_memsz, ARCH_DMA_MINALIGN));
	49	++phdr;
	50	}
	51
	52	if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
	53	EF_PPC64_ELFV1_ABI)) {
	54	/*
	55	* For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
	56	* descriptor pointer with the first double word being the
	57	* address of the entry point of the function.
	58	*/
	59	uintptr_t addr = ehdr->e_entry;
	60
	61	return (Elf64_Addr )addr;
	62	}
	63
	64	return ehdr->e_entry;
65	}
66
67	unsigned long load_elf64_image_shdr(unsigned long addr)
68	{
69	Elf64_Ehdr ehdr; / Elf header structure pointer */
70	Elf64_Shdr shdr; / Section header structure pointer */
71	unsigned char strtab = 0; / String table pointer */
72	unsigned char image; / Binary image pointer */
73	int i; /* Loop counter */
74
75	ehdr = (Elf64_Ehdr *)addr;
76
77	/* Find the section header string table for output info */
78	shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
79	(ehdr->e_shstrndx * sizeof(Elf64_Shdr)));
80
81	if (shdr->sh_type == SHT_STRTAB)
82	strtab = (unsigned char *)(addr + (ulong)shdr->sh_offset);
83
84	/* Load each appropriate section */
85	for (i = 0; i < ehdr->e_shnum; ++i) {
86	shdr = (Elf64_Shdr *)(addr + (ulong)ehdr->e_shoff +
87	(i * sizeof(Elf64_Shdr)));
88
89	if (!(shdr->sh_flags & SHF_ALLOC) \|\|
90	shdr->sh_addr == 0 \|\| shdr->sh_size == 0) {
91	continue;
92	}
93
94	if (strtab) {
95	debug("%sing %s @ 0x%08lx (%ld bytes)\n",
96	(shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
97	&strtab[shdr->sh_name],
98	(unsigned long)shdr->sh_addr,
99	(long)shdr->sh_size);
100	}
101
102	if (shdr->sh_type == SHT_NOBITS) {
103	memset((void *)(uintptr_t)shdr->sh_addr, 0,
104	shdr->sh_size);
105	} else {
106	image = (unsigned char *)addr + (ulong)shdr->sh_offset;
107	memcpy((void *)(uintptr_t)shdr->sh_addr,
108	(const void *)image, shdr->sh_size);
109	}
110	flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
111	roundup((shdr->sh_addr + shdr->sh_size),
112	ARCH_DMA_MINALIGN) -
113	rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
114	}
115
116	if (ehdr->e_machine == EM_PPC64 && (ehdr->e_flags &
117	EF_PPC64_ELFV1_ABI)) {
118	/*
119	* For the 64-bit PowerPC ELF V1 ABI, e_entry is a function
120	* descriptor pointer with the first double word being the
121	* address of the entry point of the function.
122	*/
123	uintptr_t addr = ehdr->e_entry;
124
125	return (Elf64_Addr )addr;
126	}
127
128	return ehdr->e_entry;
129	}
130
131	/*
132	* A very simple ELF loader, assumes the image is valid, returns the
133	* entry point address.
134	*
135	* The loader firstly reads the EFI class to see if it's a 64-bit image.
136	* If yes, call the ELF64 loader. Otherwise continue with the ELF32 loader.
137	*/
138	unsigned long load_elf_image_phdr(unsigned long addr)
139	{
140	Elf32_Ehdr ehdr; / Elf header structure pointer */
141	Elf32_Phdr phdr; / Program header structure pointer */
142	int i;
143
144	ehdr = (Elf32_Ehdr *)addr;
145	if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
146	return load_elf64_image_phdr(addr);
147
148	phdr = (Elf32_Phdr *)(addr + ehdr->e_phoff);
149
150	/* Load each program header */
151	for (i = 0; i < ehdr->e_phnum; ++i) {
152	void dst = (void )(uintptr_t)phdr->p_paddr;
153	void src = (void )addr + phdr->p_offset;
154
155	debug("Loading phdr %i to 0x%p (%i bytes)\n",
156	i, dst, phdr->p_filesz);
157	if (phdr->p_filesz)
158	memcpy(dst, src, phdr->p_filesz);
159	if (phdr->p_filesz != phdr->p_memsz)
160	memset(dst + phdr->p_filesz, 0x00,
161	phdr->p_memsz - phdr->p_filesz);
162	flush_cache(rounddown((unsigned long)dst, ARCH_DMA_MINALIGN),
163	roundup(phdr->p_memsz, ARCH_DMA_MINALIGN));
164	++phdr;
165	}
166
167	return ehdr->e_entry;
168	}
169
170	unsigned long load_elf_image_shdr(unsigned long addr)
171	{
172	Elf32_Ehdr ehdr; / Elf header structure pointer */
173	Elf32_Shdr shdr; / Section header structure pointer */
174	unsigned char strtab = 0; / String table pointer */
175	unsigned char image; / Binary image pointer */
176	int i; /* Loop counter */
177
178	ehdr = (Elf32_Ehdr *)addr;
179	if (ehdr->e_ident[EI_CLASS] == ELFCLASS64)
180	return load_elf64_image_shdr(addr);
181
182	/* Find the section header string table for output info */
183	shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
184	(ehdr->e_shstrndx * sizeof(Elf32_Shdr)));
185
186	if (shdr->sh_type == SHT_STRTAB)
187	strtab = (unsigned char *)(addr + shdr->sh_offset);
188
189	/* Load each appropriate section */
190	for (i = 0; i < ehdr->e_shnum; ++i) {
191	shdr = (Elf32_Shdr *)(addr + ehdr->e_shoff +
192	(i * sizeof(Elf32_Shdr)));
193
194	if (!(shdr->sh_flags & SHF_ALLOC) \|\|
195	shdr->sh_addr == 0 \|\| shdr->sh_size == 0) {
196	continue;
197	}
198
199	if (strtab) {
200	debug("%sing %s @ 0x%08lx (%ld bytes)\n",
201	(shdr->sh_type == SHT_NOBITS) ? "Clear" : "Load",
202	&strtab[shdr->sh_name],
203	(unsigned long)shdr->sh_addr,
204	(long)shdr->sh_size);
205	}
206
207	if (shdr->sh_type == SHT_NOBITS) {
208	memset((void *)(uintptr_t)shdr->sh_addr, 0,
209	shdr->sh_size);
210	} else {
211	image = (unsigned char *)addr + shdr->sh_offset;
212	memcpy((void *)(uintptr_t)shdr->sh_addr,
213	(const void *)image, shdr->sh_size);
214	}
215	flush_cache(rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN),
216	roundup((shdr->sh_addr + shdr->sh_size),
217	ARCH_DMA_MINALIGN) -
218	rounddown(shdr->sh_addr, ARCH_DMA_MINALIGN));
219	}
220
221	return ehdr->e_entry;
222	}
223
224	/*
225	* Determine if a valid ELF image exists at the given memory location.
226	* First look at the ELF header magic field, then make sure that it is
227	* executable.
228	*/
229	int valid_elf_image(unsigned long addr)
230	{
231	Elf32_Ehdr ehdr; / Elf header structure pointer */
232
233	ehdr = (Elf32_Ehdr *)addr;
234
235	if (!IS_ELF(*ehdr)) {
236	printf("## No elf image at address 0x%08lx\n", addr);
237	return 0;
238	}
239
240	if (ehdr->e_type != ET_EXEC) {
241	printf("## Not a 32-bit elf image at address 0x%08lx\n", addr);
242	return 0;
243	}
244
245	return 1;
246	}