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Annotation of sys/arch/sparc/stand/common/clean-elf.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: clean-elf.c,v 1.2 2003/11/03 07:01:33 david Exp $     */
        !             2: /*
        !             3:  * Public domain. I don't even want my name on this.
        !             4:  */
        !             5: #include <stdio.h>
        !             6: #include <stdlib.h>
        !             7: #include <unistd.h>
        !             8: #include <sys/types.h>
        !             9: #include <sys/mman.h>
        !            10: #include <err.h>
        !            11: #include <elf_abi.h>
        !            12: #include <fcntl.h>
        !            13:
        !            14: int
        !            15: elf_is_okay(Elf_Ehdr *ehdr)
        !            16: {
        !            17:        int retval = 0;
        !            18:
        !            19:        /*
        !            20:         * We need to check magic, class size, endianess,
        !            21:         * and version before we look at the rest of the
        !            22:         * Elf_Ehdr structure.  These few elements are
        !            23:         * represented in a machine independent fashion.
        !            24:         */
        !            25:
        !            26:        if (IS_ELF(*ehdr) &&
        !            27:            ehdr->e_ident[EI_CLASS] == ELF_TARG_CLASS &&
        !            28:            ehdr->e_ident[EI_DATA] == ELF_TARG_DATA &&
        !            29:            ehdr->e_ident[EI_VERSION] == ELF_TARG_VER) {
        !            30:                /* Now check the machine dependant header */
        !            31:                if (ehdr->e_machine == ELF_TARG_MACH &&
        !            32:                    ehdr->e_version == ELF_TARG_VER)
        !            33:                        retval = 1;
        !            34:        }
        !            35:
        !            36:        return retval;
        !            37: }
        !            38:
        !            39: void
        !            40: cleanit(caddr_t addr)
        !            41: {
        !            42:        Elf_Ehdr *ehdr;
        !            43:        Elf_Shdr *shdr;
        !            44:        char *strtab;
        !            45:        int i;
        !            46:
        !            47:        ehdr = (Elf_Ehdr *)addr;
        !            48:        shdr = (Elf_Shdr *)(addr + ehdr->e_shoff);
        !            49:
        !            50:        strtab = shdr[ehdr->e_shstrndx].sh_offset + addr;
        !            51:
        !            52:        /*
        !            53:         * Simple. find a .text section, verify that the next section is
        !            54:         * .rodata and merge them.
        !            55:         */
        !            56:
        !            57:        for (i = 0; i < ehdr->e_shnum; i++) {
        !            58:                Elf_Shdr *t = &shdr[i];
        !            59:                Elf_Shdr *r = &shdr[i + 1];
        !            60:
        !            61: #if 0
        !            62:                printf("foo: %s %d\n", strtab + t->sh_name, t->sh_type);
        !            63:                continue;
        !            64: #endif
        !            65:                if (strcmp(strtab + t->sh_name, ".text"))
        !            66:                        continue;
        !            67:                if (strcmp(strtab + r->sh_name, ".rodata"))
        !            68:                        errx(1, "sorry, rodata merge not possible.");
        !            69:
        !            70:                t->sh_size += r->sh_size + (r->sh_offset - t->sh_offset - t->sh_size);
        !            71:                r->sh_type = SHT_NULL;
        !            72:                r->sh_name = 0;
        !            73:        }
        !            74: }
        !            75:
        !            76: int
        !            77: main(int argc, char **argv)
        !            78: {
        !            79:        int fd;
        !            80:        void *addr;
        !            81:        off_t len;
        !            82:        int pgsz = getpagesize();
        !            83:
        !            84:        if (argc != 2)
        !            85:                errx(1, "usage");
        !            86:
        !            87:        if ((fd = open(argv[1], O_RDWR)) < 0)
        !            88:                err(1, "open");
        !            89:
        !            90:        if ((len = lseek(fd, 0, SEEK_END)) < 0)
        !            91:                err(1, "lseek");
        !            92:
        !            93:        len = ((len + pgsz - 1) & ~(pgsz - 1));
        !            94:
        !            95:        if ((addr = mmap(0, len, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) ==
        !            96:            MAP_FAILED)
        !            97:                err(1, "mmap");
        !            98:
        !            99:        if (!elf_is_okay((Elf_Ehdr *)addr))
        !           100:                errx(1, "not an elf file");
        !           101:
        !           102:        cleanit(addr);
        !           103:
        !           104:        msync(addr, len, MS_SYNC|MS_INVALIDATE);
        !           105:
        !           106:        close(fd);
        !           107:        return (0);
        !           108: }
        !           109: