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/******************************************************************************
* elf.c
*
* Generic Elf-loading routines.
*/
#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/mm.h>
#include <xen/elf.h>
static inline int is_loadable_phdr(Elf_Phdr *phdr)
{
return ((phdr->p_type == PT_LOAD) &&
((phdr->p_flags & (PF_W|PF_X)) != 0));
}
int parseelfimage(char *elfbase,
unsigned long elfsize,
unsigned long *pvirtstart,
unsigned long *pkernstart,
unsigned long *pkernend,
unsigned long *pkernentry)
{
Elf_Ehdr *ehdr = (Elf_Ehdr *)elfbase;
Elf_Phdr *phdr;
Elf_Shdr *shdr;
unsigned long kernstart = ~0UL, kernend=0UL;
char *shstrtab, *guestinfo=NULL, *p;
int h;
if ( !IS_ELF(*ehdr) )
{
printk("Kernel image does not have an ELF header.\n");
return -EINVAL;
}
if ( (ehdr->e_phoff + (ehdr->e_phnum * ehdr->e_phentsize)) > elfsize )
{
printk("ELF program headers extend beyond end of image.\n");
return -EINVAL;
}
if ( (ehdr->e_shoff + (ehdr->e_shnum * ehdr->e_shentsize)) > elfsize )
{
printk("ELF section headers extend beyond end of image.\n");
return -EINVAL;
}
/* Find the section-header strings table. */
if ( ehdr->e_shstrndx == SHN_UNDEF )
{
printk("ELF image has no section-header strings table (shstrtab).\n");
return -EINVAL;
}
shdr = (Elf_Shdr *)(elfbase + ehdr->e_shoff +
(ehdr->e_shstrndx*ehdr->e_shentsize));
shstrtab = elfbase + shdr->sh_offset;
/* Find the special '__xen_guest' section and check its contents. */
for ( h = 0; h < ehdr->e_shnum; h++ )
{
shdr = (Elf_Shdr *)(elfbase + ehdr->e_shoff + (h*ehdr->e_shentsize));
if ( strcmp(&shstrtab[shdr->sh_name], "__xen_guest") != 0 )
continue;
guestinfo = elfbase + shdr->sh_offset;
printk("Xen-ELF header found: '%s'\n", guestinfo);
if ( (strstr(guestinfo, "GUEST_OS=linux") == NULL) ||
(strstr(guestinfo, "XEN_VER=1.3") == NULL) )
{
printk("ERROR: Xen will only load Linux built for Xen v1.3\n");
return -EINVAL;
}
break;
}
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