[PATCH v3 01/10] lib: elf: Move the generic elf loading/validating functions to lib
Keerthy
j-keerthy at ti.com
Tue Jan 21 12:07:40 CET 2020
Move the generic elf loading/validating functions to lib/
so that they can be re-used and accessed by code existing
outside cmd.
Signed-off-by: Keerthy <j-keerthy at ti.com>
Suggested-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
---
cmd/Kconfig | 1 +
cmd/elf.c | 229 --------------------------------------------
include/elf.h | 4 +
lib/Kconfig | 3 +
lib/Makefile | 1 +
lib/elf.c | 256 ++++++++++++++++++++++++++++++++++++++++++++++++++
6 files changed, 265 insertions(+), 229 deletions(-)
create mode 100644 lib/elf.c
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 298feae24d..6f4f08d02a 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -375,6 +375,7 @@ config CMD_ADTIMG
config CMD_ELF
bool "bootelf, bootvx"
default y
+ select ELF
help
Boot an ELF/vxWorks image from the memory.
diff --git a/cmd/elf.c b/cmd/elf.c
index 32f12a72b9..23cc17aebc 100644
--- a/cmd/elf.c
+++ b/cmd/elf.c
@@ -26,211 +26,6 @@
#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.
- */
-static 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;
-}
-
-static 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.
- */
-static 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;
-}
-
-static 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;
-}
-
/* Allow ports to override the default behavior */
static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
int argc, char * const argv[])
@@ -246,30 +41,6 @@ static unsigned long do_bootelf_exec(ulong (*entry)(int, char * const[]),
return ret;
}
-/*
- * 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;
-}
-
/* Interpreter command to boot an arbitrary ELF image from memory */
int do_bootelf(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
diff --git a/include/elf.h b/include/elf.h
index 81f40191d7..e7c51986df 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -692,6 +692,10 @@ unsigned long elf_hash(const unsigned char *name);
#ifndef __ASSEMBLER__
int valid_elf_image(unsigned long addr);
+unsigned long load_elf64_image_phdr(unsigned long addr);
+unsigned long load_elf64_image_shdr(unsigned long addr);
+unsigned long load_elf_image_phdr(unsigned long addr);
+unsigned long load_elf_image_shdr(unsigned long addr);
#endif
#endif /* _ELF_H */
diff --git a/lib/Kconfig b/lib/Kconfig
index d040a87d26..b155ced4b2 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -601,4 +601,7 @@ config TEST_FDTDEC
config LIB_DATE
bool
+config ELF
+ bool "enable basic elf loading/validating functions"
+
endmenu
diff --git a/lib/Makefile b/lib/Makefile
index 51eba80b89..cef6db1eb8 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -122,6 +122,7 @@ obj-y += vsprintf.o strto.o
endif
obj-y += date.o
+obj-$(CONFIG_ELF) += elf.o
#
# Build a fast OID lookup registry from include/linux/oid_registry.h
diff --git a/lib/elf.c b/lib/elf.c
new file mode 100644
index 0000000000..54ac4ee502
--- /dev/null
+++ b/lib/elf.c
@@ -0,0 +1,256 @@
+/*
+ * Copyright (c) 2001 William L. Pitts
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are freely
+ * permitted provided that the above copyright notice and this
+ * paragraph and the following disclaimer are duplicated in all
+ * such forms.
+ *
+ * This software is provided "AS IS" and without any express or
+ * implied warranties, including, without limitation, the implied
+ * warranties of merchantability and fitness for a particular
+ * purpose.
+ */
+
+#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;
+}
--
2.17.1
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