[v2,1/7] configure: Drop adjustment of textseg

Message ID 20191218223441.23852-2-richard.henderson@linaro.org
State New
Headers show
Series
  • configure: Improve PIE and other linkage
Related show

Commit Message

Richard Henderson Dec. 18, 2019, 10:34 p.m.
This adjustment was random and unnecessary.  The user mode
startup code in probe_guest_base() will choose a value for
guest_base that allows the host qemu binary to not conflict
with the guest binary.

With modern distributions, this isn't even used, as the default
is PIE, which does the same job in a more portable way.

Reviewed-by: Thomas Huth <thuth@redhat.com>

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

---
v2: Remove mention of config-host.ld from make distclean
---
 Makefile  |  2 +-
 configure | 47 -----------------------------------------------
 2 files changed, 1 insertion(+), 48 deletions(-)

-- 
2.20.1

Patch

diff --git a/Makefile b/Makefile
index 1361def144..adf83f75a1 100644
--- a/Makefile
+++ b/Makefile
@@ -735,7 +735,7 @@  rm -f $(MANUAL_BUILDDIR)/$1/objects.inv $(MANUAL_BUILDDIR)/$1/searchindex.js $(M
 endef
 
 distclean: clean
-	rm -f config-host.mak config-host.h* config-host.ld $(DOCS) qemu-options.texi qemu-img-cmds.texi qemu-monitor.texi qemu-monitor-info.texi
+	rm -f config-host.mak config-host.h* $(DOCS) qemu-options.texi qemu-img-cmds.texi qemu-monitor.texi qemu-monitor-info.texi
 	rm -f tests/tcg/config-*.mak
 	rm -f config-all-devices.mak config-all-disas.mak config.status
 	rm -f $(SUBDIR_DEVICES_MAK)
diff --git a/configure b/configure
index e0c66ee9b6..30e3875c6b 100755
--- a/configure
+++ b/configure
@@ -6298,49 +6298,6 @@  if test "$cpu" = "s390x" ; then
   fi
 fi
 
-# Probe for the need for relocating the user-only binary.
-if ( [ "$linux_user" = yes ] || [ "$bsd_user" = yes ] ) && [ "$pie" = no ]; then
-  textseg_addr=
-  case "$cpu" in
-    arm | i386 | ppc* | s390* | sparc* | x86_64 | x32)
-      # ??? Rationale for choosing this address
-      textseg_addr=0x60000000
-      ;;
-    mips)
-      # A 256M aligned address, high in the address space, with enough
-      # room for the code_gen_buffer above it before the stack.
-      textseg_addr=0x60000000
-      ;;
-  esac
-  if [ -n "$textseg_addr" ]; then
-    cat > $TMPC <<EOF
-    int main(void) { return 0; }
-EOF
-    textseg_ldflags="-Wl,-Ttext-segment=$textseg_addr"
-    if ! compile_prog "" "$textseg_ldflags"; then
-      # In case ld does not support -Ttext-segment, edit the default linker
-      # script via sed to set the .text start addr.  This is needed on FreeBSD
-      # at least.
-      if ! $ld --verbose >/dev/null 2>&1; then
-        error_exit \
-            "We need to link the QEMU user mode binaries at a" \
-            "specific text address. Unfortunately your linker" \
-            "doesn't support either the -Ttext-segment option or" \
-            "printing the default linker script with --verbose." \
-            "If you don't want the user mode binaries, pass the" \
-            "--disable-user option to configure."
-      fi
-
-      $ld --verbose | sed \
-        -e '1,/==================================================/d' \
-        -e '/==================================================/,$d' \
-        -e "s/[.] = [0-9a-fx]* [+] SIZEOF_HEADERS/. = $textseg_addr + SIZEOF_HEADERS/" \
-        -e "s/__executable_start = [0-9a-fx]*/__executable_start = $textseg_addr/" > config-host.ld
-      textseg_ldflags="-Wl,-T../config-host.ld"
-    fi
-  fi
-fi
-
 # Check that the C++ compiler exists and works with the C compiler.
 # All the QEMU_CXXFLAGS are based on QEMU_CFLAGS. Keep this at the end to don't miss any other that could be added.
 if has $cxx; then
@@ -7903,10 +7860,6 @@  if test "$gprof" = "yes" ; then
   fi
 fi
 
-if test "$target_linux_user" = "yes" || test "$target_bsd_user" = "yes" ; then
-  ldflags="$ldflags $textseg_ldflags"
-fi
-
 # Newer kernels on s390 check for an S390_PGSTE program header and
 # enable the pgste page table extensions in that case. This makes
 # the vm.allocate_pgste sysctl unnecessary. We enable this program