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BSD user: implement GUEST_BASE

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Based on 379f6698d7.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Blue Swirl 2009-09-27 19:30:51 +00:00
parent 17cf428f2e
commit 2fa5d9ba56
3 changed files with 70 additions and 0 deletions
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23
bsd-user/elfload.c
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@ -1337,6 +1337,29 @@ int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
info->mmap = 0;
elf_entry = (abi_ulong) elf_ex.e_entry;
#if defined(CONFIG_USE_GUEST_BASE)
/*
* In case where user has not explicitly set the guest_base, we
* probe here that should we set it automatically.
*/
if (!have_guest_base) {
/*
* Go through ELF program header table and find out whether
* any of the segments drop below our current mmap_min_addr and
* in that case set guest_base to corresponding address.
*/
for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum;
i++, elf_ppnt++) {
if (elf_ppnt->p_type != PT_LOAD)
continue;
if (HOST_PAGE_ALIGN(elf_ppnt->p_vaddr) < mmap_min_addr) {
guest_base = HOST_PAGE_ALIGN(mmap_min_addr);
break;
}
}
}
#endif /* CONFIG_USE_GUEST_BASE */
/* Do this so that we can load the interpreter, if need be. We will
change some of these later */
info->rss = 0;