diff options
Diffstat (limited to 'qemu/roms/openbios/libopenbios/elf_info.c')
| -rw-r--r-- | qemu/roms/openbios/libopenbios/elf_info.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/qemu/roms/openbios/libopenbios/elf_info.c b/qemu/roms/openbios/libopenbios/elf_info.c new file mode 100644 index 000000000..f7febef9d --- /dev/null +++ b/qemu/roms/openbios/libopenbios/elf_info.c @@ -0,0 +1,151 @@ +/* Support for ELF Boot Proposal as a boot image */ +#include "config.h" +#include "arch/common/elf_boot.h" +#include "libopenbios/sys_info.h" +#include "asm/io.h" +#include "libopenbios/ipchecksum.h" +#include "openbios-version.h" +#define printf printk +#define debug printk + +/* ELF image notes provide information to the loader who boots us */ + +/* This compiles and generates correct PT_NOTE segment for me. + * If it doesn't, use assembly version below. */ + +struct elf_image_note { + Elf_Nhdr hdr0; + char name0[sizeof(ELF_NOTE_BOOT)]; + char prog_name[sizeof(PROGRAM_NAME)]; + + Elf_Nhdr hdr1; + char name1[sizeof(ELF_NOTE_BOOT)]; + char version[sizeof(OPENBIOS_VERSION_STR)]; + + Elf_Nhdr hdr2; + char name2[sizeof(ELF_NOTE_BOOT)]; + unsigned short checksum; +}; + +const struct elf_image_note elf_image_notes + __attribute__ ((section (".note.ELFBoot"))) = +{ + .hdr0 = { + .n_namesz = sizeof(ELF_NOTE_BOOT), + .n_descsz = sizeof(PROGRAM_NAME), + .n_type = EIN_PROGRAM_NAME, + }, + .name0 = ELF_NOTE_BOOT, + .prog_name = PROGRAM_NAME, + + .hdr1 = { + .n_namesz = sizeof(ELF_NOTE_BOOT), + .n_descsz = sizeof(OPENBIOS_VERSION_STR), + .n_type = EIN_PROGRAM_VERSION, + }, + .name1 = ELF_NOTE_BOOT, + .version = OPENBIOS_VERSION_STR, + + .hdr2 = { + .n_namesz = sizeof(ELF_NOTE_BOOT), + .n_descsz = sizeof(unsigned short), + .n_type = EIN_PROGRAM_CHECKSUM, + }, + .name2 = ELF_NOTE_BOOT, + .checksum = 0, /* to be computed by external tool */ +}; + +/* This is refered by other files */ +const char *program_name = elf_image_notes.prog_name; +const char *program_version = elf_image_notes.version; + +#if 0 + + /* This tells the linker to make a PT_NOTE segment. + * If the section is named just ".note", it will be + * mixed up with useless .version notes generated by GCC. + */ + .section ".note.ELFBoot", "a" + + .align 4 + .int 2f - 1f + .int 4f - 3f + .int EIN_PROGRAM_NAME +1: .asciz "ELFBoot" +2: .align 4 +3: .asciz PROGRAM_NAME +4: + + .align 4 + .int 2f - 1f + .int 4f - 3f + .int EIN_PROGRAM_VERSION +1: .asciz "ELFBoot" +2: .align 4 +3: .asciz OPENBIOS_VERSION_STR +4: + + .align 4 + .int 2f - 1f + .int 4f - 3f + .int EIN_PROGRAM_CHECKSUM +1: .asciz "ELFBoot" +2: .align 4 +3: .short 0 +4: +#endif + +/* Collect information from the ELF bootloader + * Note that we have to copy them to our own memory, + * otherwise they might be overwritten afterward. */ +void collect_elfboot_info(struct sys_info *info) +{ + Elf_Bhdr *hdr = NULL; + char *addr, *end; + Elf_Nhdr *nhdr; + char *desc; + + if (info->boot_type == ELF_BHDR_MAGIC) + hdr = phys_to_virt(info->boot_data); + else + hdr = phys_to_virt(info->boot_arg); + + if (hdr->b_signature != ELF_BHDR_MAGIC) + return; + + if (ipchksum(hdr, hdr->b_size) != 0) { + printf("Broken ELF boot notes\n"); + return; + } + + addr = (char *) (hdr + 1); + end = addr + hdr->b_size; + while (addr < end) { + nhdr = (Elf_Nhdr *) addr; + addr += sizeof(Elf_Nhdr); + addr += (nhdr->n_namesz + 3) & ~3; + desc = addr; + addr += (nhdr->n_descsz + 3) & ~3; + + if (nhdr->n_namesz == 0) { + /* Standard notes */ + switch (nhdr->n_type) { + case EBN_FIRMWARE_TYPE: + info->firmware = strdup(desc); + break; + case EBN_BOOTLOADER_NAME: + debug("Bootloader: %s\n", desc); + break; + case EBN_BOOTLOADER_VERSION: + debug("Version: %s\n", desc); + break; + case EBN_COMMAND_LINE: + info->command_line = strdup(desc); + break; + case EBN_LOADED_IMAGE: + debug("Image name: %s\n", desc); + break; + } + } + } +} |