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[Qemu-devel] [PATCH 2/3] Fix text relocations in linux-user targets
From: |
Kirill A. Shutemov |
Subject: |
[Qemu-devel] [PATCH 2/3] Fix text relocations in linux-user targets |
Date: |
Sat, 12 Sep 2009 02:17:54 +0300 |
There is a link hack in linux-user which produces an executable that
looks like PIE, but always has text relocations since all object files
isn't position-independent (compiled without -fpic/-fpie). Dynamic loader
has to do more work to load a binary with text relocations.
The best way to keep this functionality is to build a true PIE without
text relocations.
Signed-off-by: Kirill A. Shutemov <address@hidden>
---
configure | 12 +-----------
linux-user/main.c | 26 --------------------------
2 files changed, 1 insertions(+), 37 deletions(-)
diff --git a/configure b/configure
index 1ecb1ab..b2f52b2 100755
--- a/configure
+++ b/configure
@@ -2357,16 +2357,6 @@ fi
linker_script="-Wl,-T../config-host.ld -Wl,-T,\$(SRC_PATH)/\$(ARCH).ld"
if test "$target_linux_user" = "yes" -o "$target_bsd_user" = "yes" ; then
case "$ARCH" in
- i386)
- if test "$gprof" = "yes" -o "$static" = "yes" ; then
- ldflags="$linker_script $ldflags"
- else
- # WARNING: this LDFLAGS is _very_ tricky : qemu is an ELF shared object
- # that the kernel ELF loader considers as an executable. I think this
- # is the simplest way to make it self virtualizable!
- ldflags="-Wl,-shared $ldflags"
- fi
- ;;
sparc)
# -static is used to avoid g1/g3 usage by the dynamic linker
ldflags="$linker_script -static $ldflags"
@@ -2374,7 +2364,7 @@ if test "$target_linux_user" = "yes" -o
"$target_bsd_user" = "yes" ; then
ia64)
ldflags="-Wl,-G0 $linker_script -static $ldflags"
;;
- x86_64|ppc|ppc64|s390|sparc64|alpha|arm|m68k|mips|mips64)
+ i386|x86_64|ppc|ppc64|s390|sparc64|alpha|arm|m68k|mips|mips64)
ldflags="$linker_script $ldflags"
;;
esac
diff --git a/linux-user/main.c b/linux-user/main.c
index a628c01..81a1ada 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -48,32 +48,6 @@ int have_guest_base;
static const char *interp_prefix = CONFIG_QEMU_PREFIX;
const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
-#if defined(__i386__) && !defined(CONFIG_STATIC)
-/* Force usage of an ELF interpreter even if it is an ELF shared
- object ! */
-const char interp[] __attribute__((section(".interp"))) = "/lib/ld-linux.so.2";
-#endif
-
-/* for recent libc, we add these dummy symbols which are not declared
- when generating a linked object (bug in ld ?) */
-#if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)) &&
!defined(CONFIG_STATIC)
-asm(".globl __preinit_array_start\n"
- ".globl __preinit_array_end\n"
- ".globl __init_array_start\n"
- ".globl __init_array_end\n"
- ".globl __fini_array_start\n"
- ".globl __fini_array_end\n"
- ".section \".rodata\"\n"
- "__preinit_array_start:\n"
- "__preinit_array_end:\n"
- "__init_array_start:\n"
- "__init_array_end:\n"
- "__fini_array_start:\n"
- "__fini_array_end:\n"
- ".long 0\n"
- ".previous\n");
-#endif
-
/* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
we allocate a bigger stack. Need a better solution, for example
by remapping the process stack directly at the right place */
--
1.6.4.2