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#include <stdio.h>
#include "elf_info.h"
Elf32_Ehdr elf_head;
Elf32_Phdr *elf_prog;
#ifdef TEST
FILE *ifd;
main(argc, argv)
int argc;
char **argv;
{
ifd = fopen(argv[1], "r");
if (ifd == 0)
exit(1);
read_elfprog();
write_ram("", -1L, 0);
fclose(ifd);
}
read_file(buf, offset, len)
void *buf;
long offset;
int len;
{
fseek(ifd, offset, 0);
return fread(buf, 1, len, ifd);
}
write_ram(buf, linear, len)
char *buf;
long linear;
int len;
{
static long llen = 0;
static long lastlin= -1;
if( llen > 0 && lastlin + llen != linear )
{
printf("for %8ld bytes\n", llen);
lastlin= -1;
}
if( lastlin == -1 )
{
lastlin = linear;
llen = 0;
if( linear != -1 )
printf("Write %08lx ", linear);
}
llen += len;
return len;
}
error(str)
char *str;
{
printf("Error: %s\n", str);
return -1;
}
#endif
info_elf()
{
int i;
printf("ELF-386 executable, entry = 0x%08lx\n", elf_head.e_entry);
printf("\t\toffset paddr vaddr filesz memsz align\n");
for (i = 0; i < elf_head.e_phnum; i++)
{
printf(" %d: ", i);
switch ((int) elf_prog[i].p_type)
{
case PT_NULL:
printf("PT_NULL");
break;
case PT_LOAD:
printf("PT_LOAD");
break;
case PT_DYNAMIC:
printf("PT_DYNAMIC");
break;
case PT_INTERP:
printf("PT_INTERP");
break;
case PT_NOTE:
printf("PT_NOTE");
break;
case PT_SHLIB:
printf("PT_SHLIB");
break;
case PT_PHDR:
printf("PT_PHDR");
break;
default:
printf("PT_(%d)", elf_prog[i].p_type);
break;
}
printf("\t%08lx %08lx %08lx %08lx %08lx %08lx",
elf_prog[i].p_offset,
elf_prog[i].p_paddr,
elf_prog[i].p_vaddr,
elf_prog[i].p_filesz,
elf_prog[i].p_memsz,
elf_prog[i].p_align
);
printf("\n");
}
}
read_elfprog()
{
static unsigned char elf_ok[] =
{ELFMAG0, ELFMAG1, ELFMAG2, ELFMAG3, ELFCLASS32, ELFDATA2LSB, EV_CURRENT};
int i;
char page_buf[4096];
if (read_file(&elf_head, 0L, sizeof(elf_head)) != sizeof(elf_head))
return error("Can't read ELF header");
if (memcmp(elf_head.e_ident, elf_ok, 7) != 0 ||
elf_head.e_type != ET_EXEC ||
elf_head.e_machine != EM_386 ||
elf_head.e_phnum <= 0 ||
elf_head.e_phentsize != sizeof(Elf32_Phdr)
)
return error("Not a 386 executable ELF program");
elf_prog = malloc(i = sizeof(Elf32_Phdr) * elf_head.e_phnum);
if (elf_prog == 0)
return error("Out of memory");
if (read_file(elf_prog, elf_head.e_phoff, i) != i)
return error("Can't read ELF program header");
info_elf();
for (i = 0; i < elf_head.e_phnum; i++)
{
long from, to, length, copied;
int chunk;
switch ((int) elf_prog[i].p_type)
{
case PT_NULL:
case PT_NOTE:
continue;
default:
return error("ELF: Unusable program segment (Must be static)");
case PT_LOAD:
break;
}
from=elf_prog[i].p_offset;
to=elf_prog[i].p_vaddr;
length=elf_prog[i].p_filesz;
for(copied=0; copied<length; )
{
if(length>copied+sizeof(page_buf)) chunk=sizeof(page_buf);
else chunk=length-copied;
if( (chunk=read_file(page_buf, from, chunk)) <= 0 )
return error("ELF Cannot read executable");
if( write_ram(page_buf, to, chunk) < 0 )
return error("Memory save failed");
copied+=chunk; from+=chunk; to+=chunk;
}
length=elf_prog[i].p_memsz;
if( length > copied )
{
write_ram("", -1L, 0);
memset(page_buf, '\0', sizeof(page_buf));
for(; copied<length; )
{
if(length>copied+sizeof(page_buf)) chunk=sizeof(page_buf);
else chunk=length-copied;
if( write_ram(page_buf, to, chunk) < 0 )
return error("Memory zap failed");
copied+=chunk; to+=chunk;
}
}
}
}
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