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Annotation of Gnu-Mach/kern/elf-load.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1995, 1994, 1993, 1992, 1991, 1990  
        !             3:  * Open Software Foundation, Inc. 
        !             4:  *  
        !             5:  * Permission to use, copy, modify, and distribute this software and 
        !             6:  * its documentation for any purpose and without fee is hereby granted, 
        !             7:  * provided that the above copyright notice appears in all copies and 
        !             8:  * that both the copyright notice and this permission notice appear in 
        !             9:  * supporting documentation, and that the name of ("OSF") or Open Software 
        !            10:  * Foundation not be used in advertising or publicity pertaining to 
        !            11:  * distribution of the software without specific, written prior permission. 
        !            12:  *  
        !            13:  * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE 
        !            14:  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 
        !            15:  * FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL OSF BE LIABLE FOR ANY 
        !            16:  * SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 
        !            17:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 
        !            18:  * ACTION OF CONTRACT, NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING 
        !            19:  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE 
        !            20:  */
        !            21: /*
        !            22:  * OSF Research Institute MK6.1 (unencumbered) 1/31/1995
        !            23:  */
        !            24: 
        !            25: #include <alloca.h>
        !            26: #include <mach/machine/vm_types.h>
        !            27: #include <mach/exec/elf.h>
        !            28: #include <mach/exec/exec.h>
        !            29: 
        !            30: int exec_load(exec_read_func_t *read, exec_read_exec_func_t *read_exec,
        !            31:                  void *handle, exec_info_t *out_info)
        !            32: {
        !            33:        vm_size_t actual;
        !            34:        Elf32_Ehdr x;
        !            35:        Elf32_Phdr *phdr, *ph;
        !            36:        vm_size_t phsize;
        !            37:        int i;
        !            38:        int result;
        !            39: 
        !            40:        /* Read the ELF header.  */
        !            41:        if ((result = (*read)(handle, 0, &x, sizeof(x), &actual)) != 0)
        !            42:                return result;
        !            43:        if (actual < sizeof(x))
        !            44:                return EX_NOT_EXECUTABLE;
        !            45: 
        !            46:        if ((x.e_ident[EI_MAG0] != ELFMAG0) ||
        !            47:            (x.e_ident[EI_MAG1] != ELFMAG1) ||
        !            48:            (x.e_ident[EI_MAG2] != ELFMAG2) ||
        !            49:            (x.e_ident[EI_MAG3] != ELFMAG3))
        !            50:                return EX_NOT_EXECUTABLE;
        !            51: 
        !            52:        /* Make sure the file is of the right architecture.  */
        !            53:        if ((x.e_ident[EI_CLASS] != ELFCLASS32) ||
        !            54:            (x.e_ident[EI_DATA] != MY_EI_DATA) ||
        !            55:            (x.e_machine != MY_E_MACHINE))
        !            56:                return EX_WRONG_ARCH;
        !            57: 
        !            58:        /* XXX others */
        !            59:        out_info->entry = (vm_offset_t) x.e_entry;
        !            60: 
        !            61:        phsize = x.e_phnum * x.e_phentsize;
        !            62:        phdr = (Elf32_Phdr *)alloca(phsize);
        !            63: 
        !            64:        result = (*read)(handle, x.e_phoff, phdr, phsize, &actual);
        !            65:        if (result)
        !            66:                return result;
        !            67:        if (actual < phsize)
        !            68:                return EX_CORRUPT;
        !            69: 
        !            70:        for (i = 0; i < x.e_phnum; i++)
        !            71:        {
        !            72:                ph = (Elf32_Phdr *)((vm_offset_t)phdr + i * x.e_phentsize);
        !            73:                if (ph->p_type == PT_LOAD)
        !            74:                {
        !            75:                        exec_sectype_t type = EXEC_SECTYPE_ALLOC |
        !            76:                                              EXEC_SECTYPE_LOAD;
        !            77:                        if (ph->p_flags & PF_R) type |= EXEC_SECTYPE_READ;
        !            78:                        if (ph->p_flags & PF_W) type |= EXEC_SECTYPE_WRITE;
        !            79:                        if (ph->p_flags & PF_X) type |= EXEC_SECTYPE_EXECUTE;
        !            80:                        result = (*read_exec)(handle,
        !            81:                                              ph->p_offset, ph->p_filesz,
        !            82:                                              ph->p_vaddr, ph->p_memsz, type);
        !            83:                }
        !            84:        }
        !            85: 
        !            86:        return 0;
        !            87: }
        !            88: 

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