From: Alexander Graf Date: Thu, 5 Jun 2014 09:39:43 +0000 (+0200) Subject: linux-user: Tell guest about big host page sizes X-Git-Tag: v2.1.0-rc0~53^2~5 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a70daba3771;p=thirdparty%2Fqemu.git linux-user: Tell guest about big host page sizes We tell the guest its page size via AUX vectors. The guest process then uses this page size as information on which boundaries it can mmap() things. However, if the host has a bigger page size granularity than the guest, it can not fulfill these mmap() requests - which falls apart when MAP_FIXED is passed to mmap. So in that case, let the guest know that we're running on a bigger page size granularity than the target would require. This fixes running qemu-ppc (TARGET_PAGE_SIZE=4k) on a 64k page size ppc64 host for me. Signed-off-by: Alexander Graf Reviewed-by: Richard Henderson --- diff --git a/linux-user/elfload.c b/linux-user/elfload.c index eb8d3adce3d..c123244ecd4 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -1552,7 +1552,7 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc, NEW_AUX_ENT(AT_PHDR, (abi_ulong)(info->load_addr + exec->e_phoff)); NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr))); NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); - NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); + NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(MAX(TARGET_PAGE_SIZE, getpagesize()))); NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_info ? interp_info->load_addr : 0)); NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); NEW_AUX_ENT(AT_ENTRY, info->entry);