diff options
| -rw-r--r-- | arch/mips/Makefile | 9 | ||||
| -rw-r--r-- | arch/mips/tools/.gitignore | 1 | ||||
| -rw-r--r-- | arch/mips/tools/Makefile | 5 | ||||
| -rw-r--r-- | arch/mips/tools/elf-entry.c | 96 |
4 files changed, 104 insertions, 7 deletions
diff --git a/arch/mips/Makefile b/arch/mips/Makefile index d74b3742fa5d..053e1c314f9e 100644 --- a/arch/mips/Makefile +++ b/arch/mips/Makefile @@ -13,6 +13,7 @@ # archscripts: scripts_basic + $(Q)$(MAKE) $(build)=arch/mips/tools elf-entry $(Q)$(MAKE) $(build)=arch/mips/boot/tools relocs KBUILD_DEFCONFIG := 32r2el_defconfig @@ -257,13 +258,7 @@ ifdef CONFIG_PHYSICAL_START load-y = $(CONFIG_PHYSICAL_START) endif -# Sign-extend the entry point to 64 bits if retrieved as a 32-bit number. -entry-y = $(shell $(OBJDUMP) -f vmlinux 2>/dev/null \ - | sed -n '/^start address / { \ - s/^.* //; \ - s/0x\([0-7].......\)$$/0x00000000\1/; \ - s/0x\(........\)$$/0xffffffff\1/; p }') - +entry-y = $(shell $(objtree)/arch/mips/tools/elf-entry vmlinux) cflags-y += -I$(srctree)/arch/mips/include/asm/mach-generic drivers-$(CONFIG_PCI) += arch/mips/pci/ diff --git a/arch/mips/tools/.gitignore b/arch/mips/tools/.gitignore new file mode 100644 index 000000000000..56d34ccccce4 --- /dev/null +++ b/arch/mips/tools/.gitignore @@ -0,0 +1 @@ +elf-entry diff --git a/arch/mips/tools/Makefile b/arch/mips/tools/Makefile new file mode 100644 index 000000000000..3baee4bc6775 --- /dev/null +++ b/arch/mips/tools/Makefile @@ -0,0 +1,5 @@ +# SPDX-License-Identifier: GPL-2.0 +hostprogs-y := elf-entry +PHONY += elf-entry +elf-entry: $(obj)/elf-entry + @: diff --git a/arch/mips/tools/elf-entry.c b/arch/mips/tools/elf-entry.c new file mode 100644 index 000000000000..adde79ce7fc0 --- /dev/null +++ b/arch/mips/tools/elf-entry.c @@ -0,0 +1,96 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <byteswap.h> +#include <elf.h> +#include <endian.h> +#include <inttypes.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#ifdef be32toh +/* If libc provides [bl]e{32,64}toh() then we'll use them */ +#elif BYTE_ORDER == LITTLE_ENDIAN +# define be32toh(x) bswap_32(x) +# define le32toh(x) (x) +# define be64toh(x) bswap_64(x) +# define le64toh(x) (x) +#elif BYTE_ORDER == BIG_ENDIAN +# define be32toh(x) (x) +# define le32toh(x) bswap_32(x) +# define be64toh(x) (x) +# define le64toh(x) bswap_64(x) +#endif + +__attribute__((noreturn)) +static void die(const char *msg) +{ + fputs(msg, stderr); + exit(EXIT_FAILURE); +} + +int main(int argc, const char *argv[]) +{ + uint64_t entry; + size_t nread; + FILE *file; + union { + Elf32_Ehdr ehdr32; + Elf64_Ehdr ehdr64; + } hdr; + + if (argc != 2) + die("Usage: elf-entry <elf-file>\n"); + + file = fopen(argv[1], "r"); + if (!file) { + perror("Unable to open input file"); + return EXIT_FAILURE; + } + + nread = fread(&hdr, 1, sizeof(hdr), file); + if (nread != sizeof(hdr)) { + perror("Unable to read input file"); + return EXIT_FAILURE; + } + + if (memcmp(hdr.ehdr32.e_ident, ELFMAG, SELFMAG)) + die("Input is not an ELF\n"); + + switch (hdr.ehdr32.e_ident[EI_CLASS]) { + case ELFCLASS32: + switch (hdr.ehdr32.e_ident[EI_DATA]) { + case ELFDATA2LSB: + entry = le32toh(hdr.ehdr32.e_entry); + break; + case ELFDATA2MSB: + entry = be32toh(hdr.ehdr32.e_entry); + break; + default: + die("Invalid ELF encoding\n"); + } + + /* Sign extend to form a canonical address */ + entry = (int64_t)(int32_t)entry; + break; + + case ELFCLASS64: + switch (hdr.ehdr32.e_ident[EI_DATA]) { + case ELFDATA2LSB: + entry = le64toh(hdr.ehdr64.e_entry); + break; + case ELFDATA2MSB: + entry = be64toh(hdr.ehdr64.e_entry); + break; + default: + die("Invalid ELF encoding\n"); + } + break; + + default: + die("Invalid ELF class\n"); + } + + printf("0x%016" PRIx64 "\n", entry); + return EXIT_SUCCESS; +} |