elf.c

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/*****************************************************************************************
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 All rights reserved.

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 permitted provided that the following conditions are met:

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 conditions, the following disclaimer and the list of authors.  Redistributions in binary
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 without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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 $Id: elf_8c-source.html 88 2016-01-12 00:11:29Z reddawg $

*****************************************************************************************/

#include <ubixos/elf.h>
#include <ubixos/kpanic.h>
#include <lib/kmalloc.h>
#include <vmm/vmm.h>

const struct {
  char  *elfTypeName;
  uInt32 id;
  } elfType[] = {
    { "ET_NONE",         0 },
    { "ET_REL",          1 },
    { "ET_EXEC",         2 },
    { "ET_DYN",          3 },
    { "ET_CORE",         4 },
    { "ET_LOPROC",  0xff00 },
    { "ET_HIPROC",  0xffff },
    };

const struct {
  char   *phTypeName;
  uInt32 id;
  } elfPhType[] = {
    { "PT_NULL",              0 },
    { "PT_LOAD",              1 },
    { "PT_DYNAMIC",           2 },
    { "PT_INTERP",            3 },
    { "PT_NOTE",              4 },
    { "PT_SHLIB",             5 },
    { "PT_PHDR",              6 },
    { "PT_LOPROC",   0x70000000 },
    { "PT_HIPROC",   0x7fffffff },
    };

const struct {
  char   *shTypeName;
  uInt32 id;
  } elfShType[] = {
    {"SHT_NULL",     0 },
    {"SHT_PROGBITS", 1 },
    {"SHT_SYMTAB",   2 },
    {"SHT_STRTAB",   3 },
    {"SHT_RELA",     4 },
    {"SHT_HASH",     5 },
    {"SHT_DYNAMIC",  6 },
    {"SHT_NOTE",     7 },
    {"SHT_NOBITS",   8 },
    {"SHT_REL",      9 },
    {"SHT_SHLIB",   10 },
    {"SHT_DYNSYM",  11 },
    };

const struct {
  char *relTypeName;
  uInt32 id;
  } elfRelType[] = {
    {"R_386_NONE",        0 },
    {"R_386_32",          1 },
    {"R_386_PC32",        2 },
    {"R_386_GOT32",       3 },
    {"R_386_PLT32",       4 },
    {"R_386_COPY",        5 },
    {"R_386_GLOB_DAT",    6 },
    {"R_386_JMP_SLOT",    7 },
    {"R_386_RELATIVE",    8 },
    {"R_386_GOTOFF",      9 },
    {"R_386_GOTPC",      10 },
    };


char *elfGetShType(int shType) {
  return((char *)elfShType[shType].shTypeName);
  }

char *elfGetPhType(int phType) {
  return((char *)elfPhType[phType].phTypeName);
  }

char *elfGetRelType(int relType) {
  return((char *)elfRelType[relType].relTypeName);
  }

int elf_loadfile(kTask_t *p,const char *file,u_int32_t *addr,u_int32_t *entry) {
  int                i             = 0x0;
  int                x             = 0x0;
  int                numsegs       = 0x0;
  u_int32_t          base          = 0x0;
  u_int32_t          base_addr     = 0x0;
  elfHeader         *binaryHeader  = 0x0;
  elfProgramHeader  *programHeader = 0x0;
  fileDescriptor    *exec_fd       = 0x0;

  exec_fd = fopen(file,"r");
  if (exec_fd == 0x0)
    return(-1);
kprintf("MOO");
  /* Load the ELF header */
  if ((binaryHeader = (elfHeader *)kmalloc(sizeof(elfHeader))) == 0x0) 
    K_PANIC("malloc failed!");
  fread(binaryHeader,sizeof(elfHeader),1,exec_fd);

  /* Check If App Is A Real Application */
  if ((binaryHeader->eIdent[1] != 'E') && (binaryHeader->eIdent[2] != 'L') && (binaryHeader->eIdent[3] != 'F')) {
    kfree(binaryHeader);
    fclose(exec_fd);
    return(-1);
    }

  if (binaryHeader->eType == ET_DYN)
    base = *addr;
  else if (binaryHeader->eType == ET_EXEC)
    base = 0x0;
  else
    return(-1);

  /* Load The Program Header(s) */
  if ((programHeader = (elfProgramHeader *)kmalloc(sizeof(elfProgramHeader)*binaryHeader->ePhnum)) == 0x0)
    K_PANIC("malloc failed!");
  fseek(exec_fd,binaryHeader->ePhoff,0);
  fread(programHeader,(sizeof(elfProgramHeader)*binaryHeader->ePhnum),1,exec_fd);
kprintf("MEW: [0x%X]",base);
  for (i = 0x0;i < binaryHeader->ePhnum;i++) {
    switch (programHeader[i].phType) {
      case PT_LOAD:
        /*
        Allocate Memory Im Going To Have To Make This Load Memory With Correct
        Settings so it helps us in the future
        */
        for (x = 0x0;x < (programHeader[i].phMemsz);x += 0x1000) {
          /* Make readonly and read/write */
          if (vmm_remapPage(vmmFindFreePage(_current->id),((programHeader[i].phVaddr & 0xFFFFF000) + x + base),PAGE_DEFAULT) == 0x0)
            K_PANIC("Error: Remap Page Failed");
          memset((void *)((programHeader[i].phVaddr & 0xFFFFF000) + x + base),0x0,0x1000);
          }

        /* Now Load Section To Memory */
        fseek(exec_fd,programHeader[i].phOffset,0);
        fread((void *)programHeader[i].phVaddr,programHeader[i].phFilesz,1,exec_fd);

        if ((programHeader[i].phFlags & 0x2) != 0x2) {
          for (x = 0x0;x < (programHeader[i].phMemsz);x += 0x1000) {
            if ((vmm_setPageAttributes((programHeader[i].phVaddr & 0xFFFFF000) + x + base,PAGE_PRESENT | PAGE_USER)) != 0x0)
              K_PANIC("vmm_setPageAttributes failed");
            }
          }
        if (numsegs == 0x0)
          base_addr = (programHeader[i].phVaddr & 0xFFFFF000) + base;
        numsegs++;
        break;
      }
    }
  *addr  = base_addr;
  kprintf("entry: [0x%X]\n",*entry);
  *entry = binaryHeader->eEntry + base;
  kprintf("entry: [0x%X]\n",*entry);
  return(0x0);
  }

/***
 END
 ***/

---