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Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-2.12-pull-request' into staging

# gpg: Signature made Tue 13 Mar 2018 17:33:03 GMT
# gpg:                using RSA key F30C38BD3F2FBE3C
# gpg: Good signature from "Laurent Vivier <lvivier@redhat.com>"
# gpg:                 aka "Laurent Vivier <laurent@vivier.eu>"
# gpg:                 aka "Laurent Vivier (Red Hat) <lvivier@redhat.com>"
# Primary key fingerprint: CD2F 75DD C8E3 A4DC 2E4F  5173 F30C 38BD 3F2F BE3C

* remotes/vivier2/tags/linux-user-for-2.12-pull-request:
  linux-user: init_guest_space: Add a comment about search strategy
  linux-user: init_guest_space: Don't try to align if we'll reject it
  linux-user: init_guest_space: Clean up control flow a bit
  linux-user: init_guest_commpage: Add a comment about size check
  linux-user: init_guest_space: Clarify page alignment logic
  linux-user: init_guest_space: Correctly handle guest_start in commpage initialization
  linux-user: init_guest_space: Clean up if we can't initialize the commpage
  linux-user: Rename validate_guest_space => init_guest_commpage
  linux-user: Use #if to only call validate_guest_space for 32-bit ARM target
  qemu-binfmt-conf.sh: add qemu-xtensa
  linux-user: drop unused target_msync function
  linux-user: fix target_mprotect/target_munmap error return values
  linux-user: fix assertion in shmdt
  linux-user: fix mmap/munmap/mprotect/mremap/shmat
  linux-user: Support f_flags in statfs when available.
  linux-user: allows to use "--systemd ALL" with qemu-binfmt-conf.sh
  linux-user: Remove the unused "not implemented" signal handling stubs
  linux-user: Drop unicore32 code

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

scripts/qemu-binfmt-conf.sh

@@ -1,10 +1,10 @@
 #!/bin/sh
-# enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390/HPPA
+# enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390/HPPA/Xtensa
 # program execution by the kernel
 
 qemu_target_list="i386 i486 alpha arm armeb sparc32plus ppc ppc64 ppc64le m68k \
 mips mipsel mipsn32 mipsn32el mips64 mips64el \
-sh4 sh4eb s390x aarch64 aarch64_be hppa riscv32 riscv64"
+sh4 sh4eb s390x aarch64 aarch64_be hppa riscv32 riscv64 xtensa xtensaeb"
 
 i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
 i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
@@ -108,6 +108,14 @@ riscv64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x
 riscv64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
 riscv64_family=riscv
 
+xtensa_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x5e\x00'
+xtensa_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
+xtensa_family=xtensa
+
+xtensaeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x5e'
+xtensaeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
+xtensaeb_family=xtensaeb
+
 qemu_get_family() {
     cpu=${HOST_ARCH:-$(uname -m)}
     case "$cpu" in
@@ -154,7 +162,8 @@ Usage: qemu-binfmt-conf.sh [--qemu-path PATH][--debian][--systemd CPU]
                      instead generate update-binfmts templates
        --systemd:    don't write into /proc,
                      instead generate file for systemd-binfmt.service
-                     for the given CPU
+                     for the given CPU. If CPU is "ALL", generate a
+                     file for all known cpus
        --exportdir:  define where to write configuration files
                      (default: $SYSTEMDDIR or $DEBIANDIR)
        --credential: if yes, credential and security tokens are
@@ -301,18 +310,20 @@ while true ; do
         EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
         shift
         # check given cpu is in the supported CPU list
-        for cpu in ${qemu_target_list} ; do
-            if [ "$cpu" = "$1" ] ; then
-                break
-            fi
-        done
+        if [ "$1" != "ALL" ] ; then
+            for cpu in ${qemu_target_list} ; do
+                if [ "$cpu" = "$1" ] ; then
+                    break
+                fi
+            done
 
-        if [ "$cpu" = "$1" ] ; then
-            qemu_target_list="$1"
-        else
-            echo "ERROR: unknown CPU \"$1\"" 1>&2
-            usage
-            exit 1
+            if [ "$cpu" = "$1" ] ; then
+                qemu_target_list="$1"
+            else
+                echo "ERROR: unknown CPU \"$1\"" 1>&2
+                usage
+                exit 1
+            fi
         fi
         ;;
     -Q|--qemu-path)