common-user: Move safe-syscall.* from linux-user

Move linux-user safe-syscall.S and safe-syscall-error.c to common-user
so that bsd-user can also use it.  Also move safe-syscall.h to
include/user/.  Since there is nothing here that is related to the guest,
as opposed to the host, build it once.

Reviewed-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

MAINTAINERS

@@ -3079,6 +3079,8 @@ M: Riku Voipio <riku.voipio@iki.fi>
 S: Maintained
 F: thunk.c
 F: accel/tcg/user-exec*.c
+F: include/user/
+F: common-user/
 
 BSD user
 M: Warner Losh <imp@bsdimp.com>

bsd-user/meson.build

@@ -2,6 +2,8 @@ if not have_bsd_user
    subdir_done()
 endif
 
+common_user_inc += include_directories('.')
+
 bsd_user_ss.add(files(
   'bsdload.c',
   'elfload.c',

common-user/host/aarch64/safe-syscall.inc.S

@@ -1,7 +1,7 @@
 /*
  * safe-syscall.inc.S : host-specific assembly fragment
  * to handle signals occurring at the same time as system calls.
- * This is intended to be included by linux-user/safe-syscall.S
+ * This is intended to be included by common-user/safe-syscall.S
  *
  * Written by Richard Henderson <rth@twiddle.net>
  * Copyright (C) 2016 Red Hat, Inc.

common-user/host/arm/safe-syscall.inc.S

@@ -1,7 +1,7 @@
 /*
  * safe-syscall.inc.S : host-specific assembly fragment
  * to handle signals occurring at the same time as system calls.
- * This is intended to be included by linux-user/safe-syscall.S
+ * This is intended to be included by common-user/safe-syscall.S
  *
  * Written by Richard Henderson <rth@twiddle.net>
  * Copyright (C) 2016 Red Hat, Inc.

common-user/host/i386/safe-syscall.inc.S

@@ -1,7 +1,7 @@
 /*
  * safe-syscall.inc.S : host-specific assembly fragment
  * to handle signals occurring at the same time as system calls.
- * This is intended to be included by linux-user/safe-syscall.S
+ * This is intended to be included by common-user/safe-syscall.S
  *
  * Written by Richard Henderson <rth@twiddle.net>
  * Copyright (C) 2016 Red Hat, Inc.

common-user/host/mips/safe-syscall.inc.S

@@ -1,7 +1,7 @@
 /*
  * safe-syscall.inc.S : host-specific assembly fragment
  * to handle signals occurring at the same time as system calls.
- * This is intended to be included by linux-user/safe-syscall.S
+ * This is intended to be included by common-user/safe-syscall.S
  *
  * Written by Richard Henderson <richard.henderson@linaro.org>
  * Copyright (C) 2021 Linaro, Inc.

common-user/host/ppc64/safe-syscall.inc.S

@@ -1,7 +1,7 @@
 /*
  * safe-syscall.inc.S : host-specific assembly fragment
  * to handle signals occurring at the same time as system calls.
- * This is intended to be included by linux-user/safe-syscall.S
+ * This is intended to be included by common-user/safe-syscall.S
  *
  * Written by Richard Henderson <rth@twiddle.net>
  * Copyright (C) 2016 Red Hat, Inc.

common-user/host/riscv/safe-syscall.inc.S

@@ -1,7 +1,7 @@
 /*
  * safe-syscall.inc.S : host-specific assembly fragment
  * to handle signals occurring at the same time as system calls.
- * This is intended to be included by linux-user/safe-syscall.S
+ * This is intended to be included by common-user/safe-syscall.S
  *
  * Written by Richard Henderson <rth@twiddle.net>
  * Copyright (C) 2018 Linaro, Inc.

common-user/host/s390x/safe-syscall.inc.S

@@ -1,7 +1,7 @@
 /*
  * safe-syscall.inc.S : host-specific assembly fragment
  * to handle signals occurring at the same time as system calls.
- * This is intended to be included by linux-user/safe-syscall.S
+ * This is intended to be included by common-user/safe-syscall.S
  *
  * Written by Richard Henderson <rth@twiddle.net>
  * Copyright (C) 2016 Red Hat, Inc.

common-user/host/sparc64/safe-syscall.inc.S

@@ -1,7 +1,7 @@
 /*
  * safe-syscall.inc.S : host-specific assembly fragment
  * to handle signals occurring at the same time as system calls.
- * This is intended to be included by linux-user/safe-syscall.S
+ * This is intended to be included by common-user/safe-syscall.S
  *
  * Written by Richard Henderson <richard.henderson@linaro.org>
  * Copyright (C) 2021 Linaro, Inc.

common-user/host/x86_64/safe-syscall.inc.S

@@ -1,7 +1,7 @@
 /*
  * safe-syscall.inc.S : host-specific assembly fragment
  * to handle signals occurring at the same time as system calls.
- * This is intended to be included by linux-user/safe-syscall.S
+ * This is intended to be included by common-user/safe-syscall.S
  *
  * Copyright (C) 2015 Timothy Edward Baldwin <T.E.Baldwin99@members.leeds.ac.uk>
  *

common-user/meson.build

@@ -0,0 +1,6 @@
+common_user_inc += include_directories('host/' / host_arch)
+
+common_user_ss.add(files(
+  'safe-syscall.S',
+  'safe-syscall-error.c',
+))

common-user/safe-syscall-error.c

@@ -10,7 +10,7 @@
  */
 
 #include "qemu/osdep.h"
-#include "safe-syscall.h"
+#include "user/safe-syscall.h"
 
 /*
  * This is intended to be invoked via tail-call on the error path

linux-user/meson.build

@@ -2,6 +2,9 @@ if not have_linux_user
    subdir_done()
 endif
 
+common_user_inc += include_directories('host/' / host_arch)
+common_user_inc += include_directories('.')
+
 linux_user_ss.add(files(
   'elfload.c',
   'exit.c',
@@ -9,8 +12,6 @@ linux_user_ss.add(files(
   'linuxload.c',
   'main.c',
   'mmap.c',
-  'safe-syscall.S',
-  'safe-syscall-error.c',
   'signal.c',
   'strace.c',
   'syscall.c',

linux-user/signal.c

@@ -31,7 +31,7 @@
 #include "trace.h"
 #include "signal-common.h"
 #include "host-signal.h"
-#include "safe-syscall.h"
+#include "user/safe-syscall.h"
 
 static struct target_sigaction sigact_table[TARGET_NSIG];
 

linux-user/syscall.c

@@ -132,7 +132,7 @@
 #include "signal-common.h"
 #include "loader.h"
 #include "user-mmap.h"
-#include "safe-syscall.h"
+#include "user/safe-syscall.h"
 #include "qemu/guest-random.h"
 #include "qemu/selfmap.h"
 #include "user/syscall-trace.h"

meson.build

@@ -2378,6 +2378,7 @@ block_ss = ss.source_set()
 bsd_user_ss = ss.source_set()
 chardev_ss = ss.source_set()
 common_ss = ss.source_set()
+common_user_ss = ss.source_set()
 crypto_ss = ss.source_set()
 hwcore_ss = ss.source_set()
 io_ss = ss.source_set()
@@ -2622,15 +2623,30 @@ subdir('tcg')
 subdir('fpu')
 subdir('accel')
 subdir('plugins')
+subdir('ebpf')
+
+common_user_inc = []
+
+subdir('common-user')
 subdir('bsd-user')
 subdir('linux-user')
-subdir('ebpf')
 
 specific_ss.add_all(when: 'CONFIG_BSD_USER', if_true: bsd_user_ss)
 
 linux_user_ss.add(files('thunk.c'))
 specific_ss.add_all(when: 'CONFIG_LINUX_USER', if_true: linux_user_ss)
 
+common_user_ss = common_user_ss.apply(config_all, strict: false)
+common_user = static_library('common-user',
+                             sources: common_user_ss.sources(),
+                             dependencies: common_user_ss.dependencies(),
+                             include_directories: common_user_inc,
+                             name_suffix: 'fa',
+                             build_by_default: false)
+common_user = declare_dependency(link_with: common_user)
+
+user_ss.add(common_user)
+
 # needed for fuzzing binaries
 subdir('tests/qtest/libqos')
 subdir('tests/qtest/fuzz')