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Annotation of Gnu-Mach/kern/elf-load.c, revision 1.1.1.2

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);
1.1.1.2 ! root       83:                        if (result)
        !            84:                                return result;
1.1       root       85:                }
                     86:        }
                     87: 
                     88:        return 0;
                     89: }
                     90: 

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