Merge remote-tracking branch 'remotes/riku/tags/pull-linux-user-20160628' into staging

Drop building linux-user targets on HPPA or m68k host systems
and add safe_syscall support for i386, aarch64, arm, ppc64 and
s390x.

# gpg: Signature made Tue 28 Jun 2016 19:31:16 BST
# gpg:                using RSA key 0xB44890DEDE3C9BC0
# gpg: Good signature from "Riku Voipio <riku.voipio@iki.fi>"
# gpg:                 aka "Riku Voipio <riku.voipio@linaro.org>"
# Primary key fingerprint: FF82 03C8 C391 98AE 0581  41EF B448 90DE DE3C 9BC0

* remotes/riku/tags/pull-linux-user-20160628: (24 commits)
  linux-user: Provide safe_syscall for ppc64
  linux-user: Provide safe_syscall for s390x
  linux-user: Provide safe_syscall for aarch64
  linux-user: Provide safe_syscall for arm
  linux-user: Provide safe_syscall for i386
  linux-user: fix x86_64 safe_syscall
  linux-user: don't swap NLMSG_DATA() fields
  linux-user: fd_trans_host_to_target_data() must process only received data
  linux-user: add missing return in netlink switch statement
  linux-user: update get_thread_area/set_thread_area strace
  linux-user: fix clone() strace
  linux-user: add socket() strace
  linux-user: add socketcall() strace
  linux-user: Support F_GETPIPE_SZ and F_SETPIPE_SZ fcntls
  linux-user: Fix wrong type used for argument to rt_sigqueueinfo
  linux-user: Create a hostdep.h for each host architecture
  user-exec: Remove unused code for OSX hosts
  user-exec: Delete now-unused hppa and m68k cpu_signal_handler() code
  configure: Don't allow user-only targets for unknown CPU architectures
  configure: Don't override ARCH=unknown if enabling TCI
  ...

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

1 files changed, 38 insertions, 0 deletions

diff --git a/linux-user/host/aarch64/hostdep.h b/linux-user/host/aarch64/hostdep.h
new file mode 100644
index 0000000000..b79eaf1811
--- /dev/null
+++ b/linux-user/host/aarch64/hostdep.h
@@ -0,0 +1,38 @@
+/*
+ * hostdep.h : things which are dependent on the host architecture
+ *
+ *  * Written by Peter Maydell <peter.maydell@linaro.org>
+ *
+ * Copyright (C) 2016 Linaro Limited
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_HOSTDEP_H
+#define QEMU_HOSTDEP_H
+
+/* We have a safe-syscall.inc.S */
+#define HAVE_SAFE_SYSCALL
+
+#ifndef __ASSEMBLER__
+
+/* These are defined by the safe-syscall.inc.S file */
+extern char safe_syscall_start[];
+extern char safe_syscall_end[];
+
+/* Adjust the signal context to rewind out of safe-syscall if we're in it */
+static inline void rewind_if_in_safe_syscall(void *puc)
+{
+    struct ucontext *uc = puc;
+    __u64 *pcreg = &uc->uc_mcontext.pc;
+
+    if (*pcreg > (uintptr_t)safe_syscall_start
+        && *pcreg < (uintptr_t)safe_syscall_end) {
+        *pcreg = (uintptr_t)safe_syscall_start;
+    }
+}
+
+#endif /* __ASSEMBLER__ */
+
+#endif