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# elf.c

Go to the documentation of this file.

    00001 /*****************************************************************************************
    00002  Copyright (c) 2002-2004 The UbixOS Project
    00003  All rights reserved.
    00004
    00005  Redistribution and use in source and binary forms, with or without modification, are
    00006  permitted provided that the following conditions are met:
    00007
    00008  Redistributions of source code must retain the above copyright notice, this list of
    00009  conditions, the following disclaimer and the list of authors.  Redistributions in binary
    00010  form must reproduce the above copyright notice, this list of conditions, the following
    00011  disclaimer and the list of authors in the documentation and/or other materials provided
    00012  with the distribution. Neither the name of the UbixOS Project nor the names of its
    00013  contributors may be used to endorse or promote products derived from this software
    00014  without specific prior written permission.
    00015
    00016  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
    00017  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
    00018  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
    00019  THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    00020  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
    00021  OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
    00022  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
    00023  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    00024  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    00025
    00026  $Id: elf_8c-source.html 88 2016-01-12 00:11:29Z reddawg $
    00027
    00028 *****************************************************************************************/
    00029
    00030 #include <ubixos/elf.h>
    00031 #include <ubixos/kpanic.h>
    00032 #include <lib/kmalloc.h>
    00033 #include <vmm/vmm.h>
    00034
    00035 const struct {
    00036   char  *elfTypeName;
    00037   uInt32 id;
    00038   } elfType[] = {
    00039     { "ET_NONE",         0 },
    00040     { "ET_REL",          1 },
    00041     { "ET_EXEC",         2 },
    00042     { "ET_DYN",          3 },
    00043     { "ET_CORE",         4 },
    00044     { "ET_LOPROC",  0xff00 },
    00045     { "ET_HIPROC",  0xffff },
    00046     };
    00047
    00048 const struct {
    00049   char   *phTypeName;
    00050   uInt32 id;
    00051   } elfPhType[] = {
    00052     { "PT_NULL",              0 },
    00053     { "PT_LOAD",              1 },
    00054     { "PT_DYNAMIC",           2 },
    00055     { "PT_INTERP",            3 },
    00056     { "PT_NOTE",              4 },
    00057     { "PT_SHLIB",             5 },
    00058     { "PT_PHDR",              6 },
    00059     { "PT_LOPROC",   0x70000000 },
    00060     { "PT_HIPROC",   0x7fffffff },
    00061     };
    00062
    00063 const struct {
    00064   char   *shTypeName;
    00065   uInt32 id;
    00066   } elfShType[] = {
    00067     {"SHT_NULL",     0 },
    00068     {"SHT_PROGBITS", 1 },
    00069     {"SHT_SYMTAB",   2 },
    00070     {"SHT_STRTAB",   3 },
    00071     {"SHT_RELA",     4 },
    00072     {"SHT_HASH",     5 },
    00073     {"SHT_DYNAMIC",  6 },
    00074     {"SHT_NOTE",     7 },
    00075     {"SHT_NOBITS",   8 },
    00076     {"SHT_REL",      9 },
    00077     {"SHT_SHLIB",   10 },
    00078     {"SHT_DYNSYM",  11 },
    00079     };
    00080
    00081 const struct {
    00082   char *relTypeName;
    00083   uInt32 id;
    00084   } elfRelType[] = {
    00085     {"R_386_NONE",        0 },
    00086     {"R_386_32",          1 },
    00087     {"R_386_PC32",        2 },
    00088     {"R_386_GOT32",       3 },
    00089     {"R_386_PLT32",       4 },
    00090     {"R_386_COPY",        5 },
    00091     {"R_386_GLOB_DAT",    6 },
    00092     {"R_386_JMP_SLOT",    7 },
    00093     {"R_386_RELATIVE",    8 },
    00094     {"R_386_GOTOFF",      9 },
    00095     {"R_386_GOTPC",      10 },
    00096     };
    00097
    00098
    00099 char *elfGetShType(int shType) {
    00100   return((char *)elfShType[shType].shTypeName);
    00101   }
    00102
    00103 char *elfGetPhType(int phType) {
    00104   return((char *)elfPhType[phType].phTypeName);
    00105   }
    00106
    00107 char *elfGetRelType(int relType) {
    00108   return((char *)elfRelType[relType].relTypeName);
    00109   }
    00110
    00111 int elf_loadfile(kTask_t *p,const char *file,u_int32_t *addr,u_int32_t *entry) {
    00112   int                i             = 0x0;
    00113   int                x             = 0x0;
    00114   int                numsegs       = 0x0;
    00115   u_int32_t          base          = 0x0;
    00116   u_int32_t          base_addr     = 0x0;
    00117   elfHeader         *binaryHeader  = 0x0;
    00118   elfProgramHeader  *programHeader = 0x0;
    00119   fileDescriptor    *exec_fd       = 0x0;
    00120
    00121   exec_fd = fopen(file,"r");
    00122   if (exec_fd == 0x0)
    00123     return(-1);
    00124 kprintf("MOO");
    00125   /* Load the ELF header */
    00126   if ((binaryHeader = (elfHeader *)kmalloc(sizeof(elfHeader))) == 0x0)
    00127     K_PANIC("malloc failed!");
    00128   fread(binaryHeader,sizeof(elfHeader),1,exec_fd);
    00129
    00130   /* Check If App Is A Real Application */
    00131   if ((binaryHeader->eIdent[1] != 'E') && (binaryHeader->eIdent[2] != 'L') && (binaryHeader->eIdent[3] != 'F')) {
    00132     kfree(binaryHeader);
    00133     fclose(exec_fd);
    00134     return(-1);
    00135     }
    00136
    00137   if (binaryHeader->eType == ET_DYN)
    00138     base = *addr;
    00139   else if (binaryHeader->eType == ET_EXEC)
    00140     base = 0x0;
    00141   else
    00142     return(-1);
    00143
    00144   /* Load The Program Header(s) */
    00145   if ((programHeader = (elfProgramHeader *)kmalloc(sizeof(elfProgramHeader)*binaryHeader->ePhnum)) == 0x0)
    00146     K_PANIC("malloc failed!");
    00147   fseek(exec_fd,binaryHeader->ePhoff,0);
    00148   fread(programHeader,(sizeof(elfProgramHeader)*binaryHeader->ePhnum),1,exec_fd);
    00149 kprintf("MEW: [0x%X]",base);
    00150   for (i = 0x0;i < binaryHeader->ePhnum;i++) {
    00151     switch (programHeader[i].phType) {
    00152       case PT_LOAD:
    00153         /*
    00154         Allocate Memory Im Going To Have To Make This Load Memory With Correct
    00155         Settings so it helps us in the future
    00156         */
    00157         for (x = 0x0;x < (programHeader[i].phMemsz);x += 0x1000) {
    00158           /* Make readonly and read/write */
    00159           if (vmm_remapPage(vmmFindFreePage(_current->id),((programHeader[i].phVaddr & 0xFFFFF000) + x + base),PAGE_DEFAULT) == 0x0)
    00160             K_PANIC("Error: Remap Page Failed");
    00161           memset((void *)((programHeader[i].phVaddr & 0xFFFFF000) + x + base),0x0,0x1000);
    00162           }
    00163
    00164         /* Now Load Section To Memory */
    00165         fseek(exec_fd,programHeader[i].phOffset,0);
    00166         fread((void *)programHeader[i].phVaddr,programHeader[i].phFilesz,1,exec_fd);
    00167
    00168         if ((programHeader[i].phFlags & 0x2) != 0x2) {
    00169           for (x = 0x0;x < (programHeader[i].phMemsz);x += 0x1000) {
    00170             if ((vmm_setPageAttributes((programHeader[i].phVaddr & 0xFFFFF000) + x + base,PAGE_PRESENT | PAGE_USER)) != 0x0)
    00171               K_PANIC("vmm_setPageAttributes failed");
    00172             }
    00173           }
    00174         if (numsegs == 0x0)
    00175           base_addr = (programHeader[i].phVaddr & 0xFFFFF000) + base;
    00176         numsegs++;
    00177         break;
    00178       }
    00179     }
    00180   *addr  = base_addr;
    00181   kprintf("entry: [0x%X]\n",*entry);
    00182   *entry = binaryHeader->eEntry + base;
    00183   kprintf("entry: [0x%X]\n",*entry);
    00184   return(0x0);
    00185   }
    00186
    00187 /***
    00188  END
    00189  ***/
    00190