Pull request linux-user 20210916

Code cleanup
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Merge remote-tracking branch 'remotes/vivier2/tags/linux-user-for-6.2-pull-request' into staging

Pull request linux-user 20210916

Code cleanup

# gpg: Signature made Thu 16 Sep 2021 16:11:58 BST
# gpg:                using RSA key CD2F75DDC8E3A4DC2E4F5173F30C38BD3F2FBE3C
# gpg:                issuer "laurent@vivier.eu"
# gpg: Good signature from "Laurent Vivier <lvivier@redhat.com>" [full]
# gpg:                 aka "Laurent Vivier <laurent@vivier.eu>" [full]
# gpg:                 aka "Laurent Vivier (Red Hat) <lvivier@redhat.com>" [full]
# Primary key fingerprint: CD2F 75DD C8E3 A4DC 2E4F  5173 F30C 38BD 3F2F BE3C

* remotes/vivier2/tags/linux-user-for-6.2-pull-request:
  linux-user: Check lock_user result for ip_mreq_source sockopts
  linux-user: Drop unneeded includes from qemu.h
  linux-user: Don't include gdbstub.h in qemu.h
  linux-user: Split linux-user internals out of qemu.h
  linux-user: Split safe-syscall macro into its own header
  linux-user: Split mmap prototypes into user-mmap.h
  linux-user: Split loader-related prototypes into loader.h
  linux-user: Split signal-related prototypes into signal-common.h
  linux-user: Split strace prototypes into strace.h
  linux-user: Fix coding style nits in qemu.h

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

gdbstub.c

@@ -31,13 +31,13 @@
 #include "qemu/cutils.h"
 #include "qemu/module.h"
 #include "trace/trace-root.h"
+#include "exec/gdbstub.h"
 #ifdef CONFIG_USER_ONLY
 #include "qemu.h"
 #else
 #include "monitor/monitor.h"
 #include "chardev/char.h"
 #include "chardev/char-fe.h"
-#include "exec/gdbstub.h"
 #include "hw/cpu/cluster.h"
 #include "hw/boards.h"
 #endif

linux-user/aarch64/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 #include "qemu/guest-random.h"
 #include "semihosting/common-semi.h"
 #include "target/arm/syndrome.h"

linux-user/aarch64/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/alpha/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 void cpu_loop(CPUAlphaState *env)
 {

linux-user/alpha/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/arm/cpu_loop.c

@@ -20,8 +20,10 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "elf.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 #include "semihosting/common-semi.h"
 
 #define get_user_code_u32(x, gaddr, env)                \

linux-user/arm/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/cris/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 void cpu_loop(CPUCRISState *env)
 {

linux-user/cris/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/elfload.c

@@ -6,6 +6,9 @@
 #include <sys/shm.h>
 
 #include "qemu.h"
+#include "user-internals.h"
+#include "loader.h"
+#include "user-mmap.h"
 #include "disas/disas.h"
 #include "qemu/bitops.h"
 #include "qemu/path.h"

linux-user/exit.c

@@ -17,7 +17,9 @@
  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 #include "qemu/osdep.h"
+#include "exec/gdbstub.h"
 #include "qemu.h"
+#include "user-internals.h"
 #ifdef CONFIG_GPROF
 #include <sys/gmon.h>
 #endif

linux-user/fd-trans.c

@@ -27,7 +27,9 @@
 #include <linux/if_bridge.h>
 #endif
 #include "qemu.h"
+#include "user-internals.h"
 #include "fd-trans.h"
+#include "signal-common.h"
 
 enum {
     QEMU_IFLA_BR_UNSPEC,

linux-user/flatload.c

@@ -36,6 +36,9 @@
 #include "qemu/osdep.h"
 
 #include "qemu.h"
+#include "user-internals.h"
+#include "loader.h"
+#include "user-mmap.h"
 #include "flat.h"
 #include "target_flat.h"
 

linux-user/hexagon/cpu_loop.c

@@ -20,7 +20,9 @@
 
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 #include "internal.h"
 
 void cpu_loop(CPUHexagonState *env)

linux-user/hexagon/signal.c

@@ -19,6 +19,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/hppa/cpu_loop.c

@@ -19,7 +19,9 @@
 
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 static abi_ulong hppa_lws(CPUHPPAState *env)
 {

linux-user/hppa/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/i386/cpu_loop.c

@@ -20,7 +20,10 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
+#include "user-mmap.h"
 
 /***********************************************************/
 /* CPUX86 core interface */

linux-user/i386/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/linuxload.c

@@ -2,6 +2,8 @@
 
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
+#include "loader.h"
 
 #define NGROUPS 32
 

linux-user/loader.h

@@ -0,0 +1,59 @@
+/*
+ * loader.h: prototypes for linux-user guest binary loader
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LINUX_USER_LOADER_H
+#define LINUX_USER_LOADER_H
+
+/*
+ * Read a good amount of data initially, to hopefully get all the
+ * program headers loaded.
+ */
+#define BPRM_BUF_SIZE  1024
+
+/*
+ * This structure is used to hold the arguments that are
+ * used when loading binaries.
+ */
+struct linux_binprm {
+        char buf[BPRM_BUF_SIZE] __attribute__((aligned));
+        abi_ulong p;
+        int fd;
+        int e_uid, e_gid;
+        int argc, envc;
+        char **argv;
+        char **envp;
+        char *filename;        /* Name of binary */
+        int (*core_dump)(int, const CPUArchState *); /* coredump routine */
+};
+
+void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
+abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
+                              abi_ulong stringp, int push_ptr);
+int loader_exec(int fdexec, const char *filename, char **argv, char **envp,
+             struct target_pt_regs *regs, struct image_info *infop,
+             struct linux_binprm *);
+
+uint32_t get_elf_eflags(int fd);
+int load_elf_binary(struct linux_binprm *bprm, struct image_info *info);
+int load_flt_binary(struct linux_binprm *bprm, struct image_info *info);
+
+abi_long memcpy_to_target(abi_ulong dest, const void *src,
+                          unsigned long len);
+
+extern unsigned long guest_stack_size;
+
+#endif /* LINUX_USER_LOADER_H */

linux-user/m68k/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 void cpu_loop(CPUM68KState *env)
 {

linux-user/m68k/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/main.c

@@ -30,6 +30,7 @@
 
 #include "qapi/error.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "qemu/path.h"
 #include "qemu/queue.h"
 #include "qemu/config-file.h"
@@ -39,6 +40,7 @@
 #include "qemu/module.h"
 #include "qemu/plugin.h"
 #include "exec/exec-all.h"
+#include "exec/gdbstub.h"
 #include "tcg/tcg.h"
 #include "qemu/timer.h"
 #include "qemu/envlist.h"
@@ -49,6 +51,9 @@
 #include "cpu_loop-common.h"
 #include "crypto/init.h"
 #include "fd-trans.h"
+#include "signal-common.h"
+#include "loader.h"
+#include "user-mmap.h"
 
 #ifndef AT_FLAGS_PRESERVE_ARGV0
 #define AT_FLAGS_PRESERVE_ARGV0_BIT 0

linux-user/microblaze/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 void cpu_loop(CPUMBState *env)
 {

linux-user/microblaze/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/mips/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 #include "elf.h"
 #include "internal.h"
 #include "fpu_helper.h"

linux-user/mips/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/mmap.c

@@ -20,6 +20,8 @@
 #include "trace.h"
 #include "exec/log.h"
 #include "qemu.h"
+#include "user-internals.h"
+#include "user-mmap.h"
 
 static pthread_mutex_t mmap_mutex = PTHREAD_MUTEX_INITIALIZER;
 static __thread int mmap_lock_count;

linux-user/nios2/cpu_loop.c

@@ -19,7 +19,9 @@
 
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 void cpu_loop(CPUNios2State *env)
 {

linux-user/nios2/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/openrisc/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 void cpu_loop(CPUOpenRISCState *env)
 {

linux-user/openrisc/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/ppc/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 static inline uint64_t cpu_ppc_get_tb(CPUPPCState *env)
 {

linux-user/ppc/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/qemu.h

@@ -1,26 +1,24 @@
 #ifndef QEMU_H
 #define QEMU_H
 
-#include "hostdep.h"
 #include "cpu.h"
-#include "exec/exec-all.h"
 #include "exec/cpu_ldst.h"
 
 #undef DEBUG_REMAP
 
 #include "exec/user/abitypes.h"
 
-#include "exec/user/thunk.h"
 #include "syscall_defs.h"
 #include "target_syscall.h"
-#include "exec/gdbstub.h"
 
-/* This is the size of the host kernel's sigset_t, needed where we make
+/*
+ * This is the size of the host kernel's sigset_t, needed where we make
  * direct system calls that take a sigset_t pointer and a size.
  */
 #define SIGSET_T_SIZE (_NSIG / 8)
 
-/* This struct is used to hold certain information about the image.
+/*
+ * This struct is used to hold certain information about the image.
  * Basically, it replicates in user space what would be certain
  * task_struct fields in the kernel
  */
@@ -98,8 +96,10 @@ struct emulated_sigtable {
     target_siginfo_t info;
 };
 
-/* NOTE: we force a big alignment so that the stack stored after is
+/*
-   aligned too */
+ * NOTE: we force a big alignment so that the stack stored after is
+ * aligned too
+ */
 typedef struct TaskState {
     pid_t ts_tid;     /* tid (or pid) of this task */
 #ifdef TARGET_ARM
@@ -134,20 +134,23 @@ typedef struct TaskState {
 
     struct emulated_sigtable sync_signal;
     struct emulated_sigtable sigtab[TARGET_NSIG];
-    /* This thread's signal mask, as requested by the guest program.
+    /*
+     * This thread's signal mask, as requested by the guest program.
      * The actual signal mask of this thread may differ:
      *  + we don't let SIGSEGV and SIGBUS be blocked while running guest code
      *  + sometimes we block all signals to avoid races
      */
     sigset_t signal_mask;
-    /* The signal mask imposed by a guest sigsuspend syscall, if we are
+    /*
+     * The signal mask imposed by a guest sigsuspend syscall, if we are
      * currently in the middle of such a syscall
      */
     sigset_t sigsuspend_mask;
     /* Nonzero if we're leaving a sigsuspend and sigsuspend_mask is valid. */
     int in_sigsuspend;
 
-    /* Nonzero if process_pending_signals() needs to do something (either
+    /*
+     * Nonzero if process_pending_signals() needs to do something (either
      * handle a pending signal or unblock signals).
      * This flag is written from a signal handler so should be accessed via
      * the qatomic_read() and qatomic_set() functions. (It is not accessed
@@ -159,331 +162,7 @@ typedef struct TaskState {
     struct target_sigaltstack sigaltstack_used;
 } __attribute__((aligned(16))) TaskState;
 
-extern char *exec_path;
-void init_task_state(TaskState *ts);
-void task_settid(TaskState *);
-void stop_all_tasks(void);
-extern const char *qemu_uname_release;
-extern unsigned long mmap_min_addr;
-
-/* ??? See if we can avoid exposing so much of the loader internals.  */
-
-/* Read a good amount of data initially, to hopefully get all the
-   program headers loaded.  */
-#define BPRM_BUF_SIZE  1024
-
-/*
- * This structure is used to hold the arguments that are
- * used when loading binaries.
- */
-struct linux_binprm {
-        char buf[BPRM_BUF_SIZE] __attribute__((aligned));
-        abi_ulong p;
-        int fd;
-        int e_uid, e_gid;
-        int argc, envc;
-        char **argv;
-        char **envp;
-        char * filename;        /* Name of binary */
-        int (*core_dump)(int, const CPUArchState *); /* coredump routine */
-};
-
-typedef struct IOCTLEntry IOCTLEntry;
-
-typedef abi_long do_ioctl_fn(const IOCTLEntry *ie, uint8_t *buf_temp,
-                             int fd, int cmd, abi_long arg);
-
-struct IOCTLEntry {
-    int target_cmd;
-    unsigned int host_cmd;
-    const char *name;
-    int access;
-    do_ioctl_fn *do_ioctl;
-    const argtype arg_type[5];
-};
-
-extern IOCTLEntry ioctl_entries[];
-
-#define IOC_R 0x0001
-#define IOC_W 0x0002
-#define IOC_RW (IOC_R | IOC_W)
-
-void do_init_thread(struct target_pt_regs *regs, struct image_info *infop);
-abi_ulong loader_build_argptr(int envc, int argc, abi_ulong sp,
-                              abi_ulong stringp, int push_ptr);
-int loader_exec(int fdexec, const char *filename, char **argv, char **envp,
-             struct target_pt_regs * regs, struct image_info *infop,
-             struct linux_binprm *);
-
-/* Returns true if the image uses the FDPIC ABI. If this is the case,
- * we have to provide some information (loadmap, pt_dynamic_info) such
- * that the program can be relocated adequately. This is also useful
- * when handling signals.
- */
-int info_is_fdpic(struct image_info *info);
-
-uint32_t get_elf_eflags(int fd);
-int load_elf_binary(struct linux_binprm *bprm, struct image_info *info);
-int load_flt_binary(struct linux_binprm *bprm, struct image_info *info);
-
-abi_long memcpy_to_target(abi_ulong dest, const void *src,
-                          unsigned long len);
-void target_set_brk(abi_ulong new_brk);
 abi_long do_brk(abi_ulong new_brk);
-void syscall_init(void);
-abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
-                    abi_long arg2, abi_long arg3, abi_long arg4,
-                    abi_long arg5, abi_long arg6, abi_long arg7,
-                    abi_long arg8);
-extern __thread CPUState *thread_cpu;
-void cpu_loop(CPUArchState *env);
-const char *target_strerror(int err);
-int get_osversion(void);
-void init_qemu_uname_release(void);
-void fork_start(void);
-void fork_end(int child);
-
-/**
- * probe_guest_base:
- * @image_name: the executable being loaded
- * @loaddr: the lowest fixed address in the executable
- * @hiaddr: the highest fixed address in the executable
- *
- * Creates the initial guest address space in the host memory space.
- *
- * If @loaddr == 0, then no address in the executable is fixed,
- * i.e. it is fully relocatable.  In that case @hiaddr is the size
- * of the executable.
- *
- * This function will not return if a valid value for guest_base
- * cannot be chosen.  On return, the executable loader can expect
- *
- *    target_mmap(loaddr, hiaddr - loaddr, ...)
- *
- * to succeed.
- */
-void probe_guest_base(const char *image_name,
-                      abi_ulong loaddr, abi_ulong hiaddr);
-
-#include "qemu/log.h"
-
-/* safe_syscall.S */
-
-/**
- * safe_syscall:
- * @int number: number of system call to make
- * ...: arguments to the system call
- *
- * Call a system call if guest signal not pending.
- * This has the same API as the libc syscall() function, except that it
- * may return -1 with errno == TARGET_ERESTARTSYS if a signal was pending.
- *
- * Returns: the system call result, or -1 with an error code in errno
- * (Errnos are host errnos; we rely on TARGET_ERESTARTSYS not clashing
- * with any of the host errno values.)
- */
-
-/* A guide to using safe_syscall() to handle interactions between guest
- * syscalls and guest signals:
- *
- * Guest syscalls come in two flavours:
- *
- * (1) Non-interruptible syscalls
- *
- * These are guest syscalls that never get interrupted by signals and
- * so never return EINTR. They can be implemented straightforwardly in
- * QEMU: just make sure that if the implementation code has to make any
- * blocking calls that those calls are retried if they return EINTR.
- * It's also OK to implement these with safe_syscall, though it will be
- * a little less efficient if a signal is delivered at the 'wrong' moment.
- *
- * Some non-interruptible syscalls need to be handled using block_signals()
- * to block signals for the duration of the syscall. This mainly applies
- * to code which needs to modify the data structures used by the
- * host_signal_handler() function and the functions it calls, including
- * all syscalls which change the thread's signal mask.
- *
- * (2) Interruptible syscalls
- *
- * These are guest syscalls that can be interrupted by signals and
- * for which we need to either return EINTR or arrange for the guest
- * syscall to be restarted. This category includes both syscalls which
- * always restart (and in the kernel return -ERESTARTNOINTR), ones
- * which only restart if there is no handler (kernel returns -ERESTARTNOHAND
- * or -ERESTART_RESTARTBLOCK), and the most common kind which restart
- * if the handler was registered with SA_RESTART (kernel returns
- * -ERESTARTSYS). System calls which are only interruptible in some
- * situations (like 'open') also need to be handled this way.
- *
- * Here it is important that the host syscall is made
- * via this safe_syscall() function, and *not* via the host libc.
- * If the host libc is used then the implementation will appear to work
- * most of the time, but there will be a race condition where a
- * signal could arrive just before we make the host syscall inside libc,
- * and then then guest syscall will not correctly be interrupted.
- * Instead the implementation of the guest syscall can use the safe_syscall
- * function but otherwise just return the result or errno in the usual
- * way; the main loop code will take care of restarting the syscall
- * if appropriate.
- *
- * (If the implementation needs to make multiple host syscalls this is
- * OK; any which might really block must be via safe_syscall(); for those
- * which are only technically blocking (ie which we know in practice won't
- * stay in the host kernel indefinitely) it's OK to use libc if necessary.
- * You must be able to cope with backing out correctly if some safe_syscall
- * you make in the implementation returns either -TARGET_ERESTARTSYS or
- * EINTR though.)
- *
- * block_signals() cannot be used for interruptible syscalls.
- *
- *
- * How and why the safe_syscall implementation works:
- *
- * The basic setup is that we make the host syscall via a known
- * section of host native assembly. If a signal occurs, our signal
- * handler checks the interrupted host PC against the addresse of that
- * known section. If the PC is before or at the address of the syscall
- * instruction then we change the PC to point at a "return
- * -TARGET_ERESTARTSYS" code path instead, and then exit the signal handler
- * (causing the safe_syscall() call to immediately return that value).
- * Then in the main.c loop if we see this magic return value we adjust
- * the guest PC to wind it back to before the system call, and invoke
- * the guest signal handler as usual.
- *
- * This winding-back will happen in two cases:
- * (1) signal came in just before we took the host syscall (a race);
- *   in this case we'll take the guest signal and have another go
- *   at the syscall afterwards, and this is indistinguishable for the
- *   guest from the timing having been different such that the guest
- *   signal really did win the race
- * (2) signal came in while the host syscall was blocking, and the
- *   host kernel decided the syscall should be restarted;
- *   in this case we want to restart the guest syscall also, and so
- *   rewinding is the right thing. (Note that "restart" semantics mean
- *   "first call the signal handler, then reattempt the syscall".)
- * The other situation to consider is when a signal came in while the
- * host syscall was blocking, and the host kernel decided that the syscall
- * should not be restarted; in this case QEMU's host signal handler will
- * be invoked with the PC pointing just after the syscall instruction,
- * with registers indicating an EINTR return; the special code in the
- * handler will not kick in, and we will return EINTR to the guest as
- * we should.
- *
- * Notice that we can leave the host kernel to make the decision for
- * us about whether to do a restart of the syscall or not; we do not
- * need to check SA_RESTART flags in QEMU or distinguish the various
- * kinds of restartability.
- */
-#ifdef HAVE_SAFE_SYSCALL
-/* The core part of this function is implemented in assembly */
-extern long safe_syscall_base(int *pending, long number, ...);
-
-#define safe_syscall(...)                                               \
-    ({                                                                  \
-        long ret_;                                                      \
-        int *psp_ = &((TaskState *)thread_cpu->opaque)->signal_pending; \
-        ret_ = safe_syscall_base(psp_, __VA_ARGS__);                    \
-        if (is_error(ret_)) {                                           \
-            errno = -ret_;                                              \
-            ret_ = -1;                                                  \
-        }                                                               \
-        ret_;                                                           \
-    })
-
-#else
-
-/* Fallback for architectures which don't yet provide a safe-syscall assembly
- * fragment; note that this is racy!
- * This should go away when all host architectures have been updated.
- */
-#define safe_syscall syscall
-
-#endif
-
-/* syscall.c */
-int host_to_target_waitstatus(int status);
-
-/* strace.c */
-void print_syscall(void *cpu_env, int num,
-                   abi_long arg1, abi_long arg2, abi_long arg3,
-                   abi_long arg4, abi_long arg5, abi_long arg6);
-void print_syscall_ret(void *cpu_env, int num, abi_long ret,
-                       abi_long arg1, abi_long arg2, abi_long arg3,
-                       abi_long arg4, abi_long arg5, abi_long arg6);
-/**
- * print_taken_signal:
- * @target_signum: target signal being taken
- * @tinfo: target_siginfo_t which will be passed to the guest for the signal
- *
- * Print strace output indicating that this signal is being taken by the guest,
- * in a format similar to:
- * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---
- */
-void print_taken_signal(int target_signum, const target_siginfo_t *tinfo);
-
-/* signal.c */
-void process_pending_signals(CPUArchState *cpu_env);
-void signal_init(void);
-int queue_signal(CPUArchState *env, int sig, int si_type,
-                 target_siginfo_t *info);
-void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
-void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
-int target_to_host_signal(int sig);
-int host_to_target_signal(int sig);
-long do_sigreturn(CPUArchState *env);
-long do_rt_sigreturn(CPUArchState *env);
-abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr,
-                        CPUArchState *env);
-int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
-abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx,
-                        abi_ulong unew_ctx, abi_long ctx_size);
-/**
- * block_signals: block all signals while handling this guest syscall
- *
- * Block all signals, and arrange that the signal mask is returned to
- * its correct value for the guest before we resume execution of guest code.
- * If this function returns non-zero, then the caller should immediately
- * return -TARGET_ERESTARTSYS to the main loop, which will take the pending
- * signal and restart execution of the syscall.
- * If block_signals() returns zero, then the caller can continue with
- * emulation of the system call knowing that no signals can be taken
- * (and therefore that no race conditions will result).
- * This should only be called once, because if it is called a second time
- * it will always return non-zero. (Think of it like a mutex that can't
- * be recursively locked.)
- * Signals will be unblocked again by process_pending_signals().
- *
- * Return value: non-zero if there was a pending signal, zero if not.
- */
-int block_signals(void); /* Returns non zero if signal pending */
-
-#ifdef TARGET_I386
-/* vm86.c */
-void save_v86_state(CPUX86State *env);
-void handle_vm86_trap(CPUX86State *env, int trapno);
-void handle_vm86_fault(CPUX86State *env);
-int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr);
-#elif defined(TARGET_SPARC64)
-void sparc64_set_context(CPUSPARCState *env);
-void sparc64_get_context(CPUSPARCState *env);
-#endif
-
-/* mmap.c */
-int target_mprotect(abi_ulong start, abi_ulong len, int prot);
-abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
-                     int flags, int fd, abi_ulong offset);
-int target_munmap(abi_ulong start, abi_ulong len);
-abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
-                       abi_ulong new_size, unsigned long flags,
-                       abi_ulong new_addr);
-extern unsigned long last_brk;
-extern abi_ulong mmap_next_start;
-abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong);
-void mmap_fork_start(void);
-void mmap_fork_end(int child);
-
-/* main.c */
-extern unsigned long guest_stack_size;
 
 /* user access */
 
@@ -667,80 +346,4 @@ void *lock_user_string(abi_ulong guest_addr);
 #define unlock_user_struct(host_ptr, guest_addr, copy)		\
     unlock_user(host_ptr, guest_addr, (copy) ? sizeof(*host_ptr) : 0)
 
-#include <pthread.h>
-
-static inline int is_error(abi_long ret)
-{
-    return (abi_ulong)ret >= (abi_ulong)(-4096);
-}
-
-#if TARGET_ABI_BITS == 32
-static inline uint64_t target_offset64(uint32_t word0, uint32_t word1)
-{
-#ifdef TARGET_WORDS_BIGENDIAN
-    return ((uint64_t)word0 << 32) | word1;
-#else
-    return ((uint64_t)word1 << 32) | word0;
-#endif
-}
-#else /* TARGET_ABI_BITS == 32 */
-static inline uint64_t target_offset64(uint64_t word0, uint64_t word1)
-{
-    return word0;
-}
-#endif /* TARGET_ABI_BITS != 32 */
-
-void print_termios(void *arg);
-
-/* ARM EABI and MIPS expect 64bit types aligned even on pairs or registers */
-#ifdef TARGET_ARM
-static inline int regpairs_aligned(void *cpu_env, int num)
-{
-    return ((((CPUARMState *)cpu_env)->eabi) == 1) ;
-}
-#elif defined(TARGET_MIPS) && (TARGET_ABI_BITS == 32)
-static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
-#elif defined(TARGET_PPC) && !defined(TARGET_PPC64)
-/*
- * SysV AVI for PPC32 expects 64bit parameters to be passed on odd/even pairs
- * of registers which translates to the same as ARM/MIPS, because we start with
- * r3 as arg1
- */
-static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
-#elif defined(TARGET_SH4)
-/* SH4 doesn't align register pairs, except for p{read,write}64 */
-static inline int regpairs_aligned(void *cpu_env, int num)
-{
-    switch (num) {
-    case TARGET_NR_pread64:
-    case TARGET_NR_pwrite64:
-        return 1;
-
-    default:
-        return 0;
-    }
-}
-#elif defined(TARGET_XTENSA)
-static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
-#elif defined(TARGET_HEXAGON)
-static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
-#else
-static inline int regpairs_aligned(void *cpu_env, int num) { return 0; }
-#endif
-
-/**
- * preexit_cleanup: housekeeping before the guest exits
- *
- * env: the CPU state
- * code: the exit code
- */
-void preexit_cleanup(CPUArchState *env, int code);
-
-/* Include target-specific struct and function definitions;
- * they may need access to the target-independent structures
- * above, so include them last.
- */
-#include "target_cpu.h"
-#include "target_structs.h"
-
 #endif /* QEMU_H */

linux-user/riscv/cpu_loop.c

@@ -21,7 +21,9 @@
 #include "qemu-common.h"
 #include "qemu/error-report.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 #include "elf.h"
 #include "semihosting/common-semi.h"
 

linux-user/riscv/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/s390x/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 /* s390x masks the fault address it reports in si_addr for SIGSEGV and SIGBUS */
 #define S390X_FAIL_ADDR_MASK -4096LL

linux-user/s390x/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/safe-syscall.h

@@ -0,0 +1,154 @@
+/*
+ * safe-syscall.h: prototypes for linux-user signal-race-safe syscalls
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LINUX_USER_SAFE_SYSCALL_H
+#define LINUX_USER_SAFE_SYSCALL_H
+
+/**
+ * safe_syscall:
+ * @int number: number of system call to make
+ * ...: arguments to the system call
+ *
+ * Call a system call if guest signal not pending.
+ * This has the same API as the libc syscall() function, except that it
+ * may return -1 with errno == TARGET_ERESTARTSYS if a signal was pending.
+ *
+ * Returns: the system call result, or -1 with an error code in errno
+ * (Errnos are host errnos; we rely on TARGET_ERESTARTSYS not clashing
+ * with any of the host errno values.)
+ */
+
+/*
+ * A guide to using safe_syscall() to handle interactions between guest
+ * syscalls and guest signals:
+ *
+ * Guest syscalls come in two flavours:
+ *
+ * (1) Non-interruptible syscalls
+ *
+ * These are guest syscalls that never get interrupted by signals and
+ * so never return EINTR. They can be implemented straightforwardly in
+ * QEMU: just make sure that if the implementation code has to make any
+ * blocking calls that those calls are retried if they return EINTR.
+ * It's also OK to implement these with safe_syscall, though it will be
+ * a little less efficient if a signal is delivered at the 'wrong' moment.
+ *
+ * Some non-interruptible syscalls need to be handled using block_signals()
+ * to block signals for the duration of the syscall. This mainly applies
+ * to code which needs to modify the data structures used by the
+ * host_signal_handler() function and the functions it calls, including
+ * all syscalls which change the thread's signal mask.
+ *
+ * (2) Interruptible syscalls
+ *
+ * These are guest syscalls that can be interrupted by signals and
+ * for which we need to either return EINTR or arrange for the guest
+ * syscall to be restarted. This category includes both syscalls which
+ * always restart (and in the kernel return -ERESTARTNOINTR), ones
+ * which only restart if there is no handler (kernel returns -ERESTARTNOHAND
+ * or -ERESTART_RESTARTBLOCK), and the most common kind which restart
+ * if the handler was registered with SA_RESTART (kernel returns
+ * -ERESTARTSYS). System calls which are only interruptible in some
+ * situations (like 'open') also need to be handled this way.
+ *
+ * Here it is important that the host syscall is made
+ * via this safe_syscall() function, and *not* via the host libc.
+ * If the host libc is used then the implementation will appear to work
+ * most of the time, but there will be a race condition where a
+ * signal could arrive just before we make the host syscall inside libc,
+ * and then then guest syscall will not correctly be interrupted.
+ * Instead the implementation of the guest syscall can use the safe_syscall
+ * function but otherwise just return the result or errno in the usual
+ * way; the main loop code will take care of restarting the syscall
+ * if appropriate.
+ *
+ * (If the implementation needs to make multiple host syscalls this is
+ * OK; any which might really block must be via safe_syscall(); for those
+ * which are only technically blocking (ie which we know in practice won't
+ * stay in the host kernel indefinitely) it's OK to use libc if necessary.
+ * You must be able to cope with backing out correctly if some safe_syscall
+ * you make in the implementation returns either -TARGET_ERESTARTSYS or
+ * EINTR though.)
+ *
+ * block_signals() cannot be used for interruptible syscalls.
+ *
+ *
+ * How and why the safe_syscall implementation works:
+ *
+ * The basic setup is that we make the host syscall via a known
+ * section of host native assembly. If a signal occurs, our signal
+ * handler checks the interrupted host PC against the addresse of that
+ * known section. If the PC is before or at the address of the syscall
+ * instruction then we change the PC to point at a "return
+ * -TARGET_ERESTARTSYS" code path instead, and then exit the signal handler
+ * (causing the safe_syscall() call to immediately return that value).
+ * Then in the main.c loop if we see this magic return value we adjust
+ * the guest PC to wind it back to before the system call, and invoke
+ * the guest signal handler as usual.
+ *
+ * This winding-back will happen in two cases:
+ * (1) signal came in just before we took the host syscall (a race);
+ *   in this case we'll take the guest signal and have another go
+ *   at the syscall afterwards, and this is indistinguishable for the
+ *   guest from the timing having been different such that the guest
+ *   signal really did win the race
+ * (2) signal came in while the host syscall was blocking, and the
+ *   host kernel decided the syscall should be restarted;
+ *   in this case we want to restart the guest syscall also, and so
+ *   rewinding is the right thing. (Note that "restart" semantics mean
+ *   "first call the signal handler, then reattempt the syscall".)
+ * The other situation to consider is when a signal came in while the
+ * host syscall was blocking, and the host kernel decided that the syscall
+ * should not be restarted; in this case QEMU's host signal handler will
+ * be invoked with the PC pointing just after the syscall instruction,
+ * with registers indicating an EINTR return; the special code in the
+ * handler will not kick in, and we will return EINTR to the guest as
+ * we should.
+ *
+ * Notice that we can leave the host kernel to make the decision for
+ * us about whether to do a restart of the syscall or not; we do not
+ * need to check SA_RESTART flags in QEMU or distinguish the various
+ * kinds of restartability.
+ */
+#ifdef HAVE_SAFE_SYSCALL
+/* The core part of this function is implemented in assembly */
+extern long safe_syscall_base(int *pending, long number, ...);
+
+#define safe_syscall(...)                                               \
+    ({                                                                  \
+        long ret_;                                                      \
+        int *psp_ = &((TaskState *)thread_cpu->opaque)->signal_pending; \
+        ret_ = safe_syscall_base(psp_, __VA_ARGS__);                    \
+        if (is_error(ret_)) {                                           \
+            errno = -ret_;                                              \
+            ret_ = -1;                                                  \
+        }                                                               \
+        ret_;                                                           \
+    })
+
+#else
+
+/*
+ * Fallback for architectures which don't yet provide a safe-syscall assembly
+ * fragment; note that this is racy!
+ * This should go away when all host architectures have been updated.
+ */
+#define safe_syscall syscall
+
+#endif
+
+#endif

linux-user/semihost.c

@@ -13,6 +13,7 @@
 #include "qemu/osdep.h"
 #include "semihosting/console.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include <termios.h>
 
 int qemu_semihosting_console_outs(CPUArchState *env, target_ulong addr)

linux-user/sh4/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 void cpu_loop(CPUSH4State *env)
 {

linux-user/sh4/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/signal-common.h

@@ -47,4 +47,40 @@ void setup_frame(int sig, struct target_sigaction *ka,
 void setup_rt_frame(int sig, struct target_sigaction *ka,
                     target_siginfo_t *info,
                     target_sigset_t *set, CPUArchState *env);
+
+void process_pending_signals(CPUArchState *cpu_env);
+void signal_init(void);
+int queue_signal(CPUArchState *env, int sig, int si_type,
+                 target_siginfo_t *info);
+void host_to_target_siginfo(target_siginfo_t *tinfo, const siginfo_t *info);
+void target_to_host_siginfo(siginfo_t *info, const target_siginfo_t *tinfo);
+int target_to_host_signal(int sig);
+int host_to_target_signal(int sig);
+long do_sigreturn(CPUArchState *env);
+long do_rt_sigreturn(CPUArchState *env);
+abi_long do_sigaltstack(abi_ulong uss_addr, abi_ulong uoss_addr,
+                        CPUArchState *env);
+int do_sigprocmask(int how, const sigset_t *set, sigset_t *oldset);
+abi_long do_swapcontext(CPUArchState *env, abi_ulong uold_ctx,
+                        abi_ulong unew_ctx, abi_long ctx_size);
+/**
+ * block_signals: block all signals while handling this guest syscall
+ *
+ * Block all signals, and arrange that the signal mask is returned to
+ * its correct value for the guest before we resume execution of guest code.
+ * If this function returns non-zero, then the caller should immediately
+ * return -TARGET_ERESTARTSYS to the main loop, which will take the pending
+ * signal and restart execution of the syscall.
+ * If block_signals() returns zero, then the caller can continue with
+ * emulation of the system call knowing that no signals can be taken
+ * (and therefore that no race conditions will result).
+ * This should only be called once, because if it is called a second time
+ * it will always return non-zero. (Think of it like a mutex that can't
+ * be recursively locked.)
+ * Signals will be unblocked again by process_pending_signals().
+ *
+ * Return value: non-zero if there was a pending signal, zero if not.
+ */
+int block_signals(void); /* Returns non zero if signal pending */
+
 #endif

linux-user/signal.c

@@ -18,10 +18,15 @@
  */
 #include "qemu/osdep.h"
 #include "qemu/bitops.h"
+#include "exec/gdbstub.h"
+
 #include <sys/ucontext.h>
 #include <sys/resource.h>
 
 #include "qemu.h"
+#include "user-internals.h"
+#include "strace.h"
+#include "loader.h"
 #include "trace.h"
 #include "signal-common.h"
 

linux-user/sparc/cpu_loop.c

@@ -20,7 +20,9 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 #define SPARC64_STACK_BIAS 2047
 

linux-user/sparc/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

linux-user/strace.c

@@ -1,4 +1,5 @@
 #include "qemu/osdep.h"
+
 #include <sys/ipc.h>
 #include <sys/msg.h>
 #include <sys/sem.h>
@@ -14,6 +15,8 @@
 #include <linux/netlink.h>
 #include <sched.h>
 #include "qemu.h"
+#include "user-internals.h"
+#include "strace.h"
 
 struct syscallname {
     int nr;

linux-user/strace.h

@@ -0,0 +1,38 @@
+/*
+ * strace.h: prototypes for linux-user builtin strace handling
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LINUX_USER_STRACE_H
+#define LINUX_USER_STRACE_H
+
+void print_syscall(void *cpu_env, int num,
+                   abi_long arg1, abi_long arg2, abi_long arg3,
+                   abi_long arg4, abi_long arg5, abi_long arg6);
+void print_syscall_ret(void *cpu_env, int num, abi_long ret,
+                       abi_long arg1, abi_long arg2, abi_long arg3,
+                       abi_long arg4, abi_long arg5, abi_long arg6);
+/**
+ * print_taken_signal:
+ * @target_signum: target signal being taken
+ * @tinfo: target_siginfo_t which will be passed to the guest for the signal
+ *
+ * Print strace output indicating that this signal is being taken by the guest,
+ * in a format similar to:
+ * --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_KERNEL, si_addr=0} ---
+ */
+void print_taken_signal(int target_signum, const target_siginfo_t *tinfo);
+
+#endif /* LINUX_USER_STRACE_H */

linux-user/syscall.c

@@ -127,6 +127,12 @@
 #include "uname.h"
 
 #include "qemu.h"
+#include "user-internals.h"
+#include "strace.h"
+#include "signal-common.h"
+#include "loader.h"
+#include "user-mmap.h"
+#include "safe-syscall.h"
 #include "qemu/guest-random.h"
 #include "qemu/selfmap.h"
 #include "user/syscall-trace.h"
@@ -2121,6 +2127,9 @@ static abi_long do_setsockopt(int sockfd, int level, int optname,
                 return -TARGET_EINVAL;
 
             ip_mreq_source = lock_user(VERIFY_READ, optval_addr, optlen, 1);
+            if (!ip_mreq_source) {
+                return -TARGET_EFAULT;
+            }
             ret = get_errno(setsockopt(sockfd, level, optname, ip_mreq_source, optlen));
             unlock_user (ip_mreq_source, optval_addr, 0);
             break;

linux-user/uaccess.c

@@ -3,6 +3,7 @@
 #include "qemu/cutils.h"
 
 #include "qemu.h"
+#include "user-internals.h"
 
 void *lock_user(int type, abi_ulong guest_addr, ssize_t len, bool copy)
 {

linux-user/uname.c

@@ -20,6 +20,7 @@
 #include "qemu/osdep.h"
 
 #include "qemu.h"
+#include "user-internals.h"
 //#include "qemu-common.h"
 #include "uname.h"
 

linux-user/user-internals.h

@@ -0,0 +1,186 @@
+/*
+ * user-internals.h: prototypes etc internal to the linux-user implementation
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LINUX_USER_USER_INTERNALS_H
+#define LINUX_USER_USER_INTERNALS_H
+
+#include "hostdep.h"
+#include "exec/user/thunk.h"
+#include "exec/exec-all.h"
+#include "qemu/log.h"
+
+extern char *exec_path;
+void init_task_state(TaskState *ts);
+void task_settid(TaskState *);
+void stop_all_tasks(void);
+extern const char *qemu_uname_release;
+extern unsigned long mmap_min_addr;
+
+typedef struct IOCTLEntry IOCTLEntry;
+
+typedef abi_long do_ioctl_fn(const IOCTLEntry *ie, uint8_t *buf_temp,
+                             int fd, int cmd, abi_long arg);
+
+struct IOCTLEntry {
+    int target_cmd;
+    unsigned int host_cmd;
+    const char *name;
+    int access;
+    do_ioctl_fn *do_ioctl;
+    const argtype arg_type[5];
+};
+
+extern IOCTLEntry ioctl_entries[];
+
+#define IOC_R 0x0001
+#define IOC_W 0x0002
+#define IOC_RW (IOC_R | IOC_W)
+
+/*
+ * Returns true if the image uses the FDPIC ABI. If this is the case,
+ * we have to provide some information (loadmap, pt_dynamic_info) such
+ * that the program can be relocated adequately. This is also useful
+ * when handling signals.
+ */
+int info_is_fdpic(struct image_info *info);
+
+void target_set_brk(abi_ulong new_brk);
+void syscall_init(void);
+abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
+                    abi_long arg2, abi_long arg3, abi_long arg4,
+                    abi_long arg5, abi_long arg6, abi_long arg7,
+                    abi_long arg8);
+extern __thread CPUState *thread_cpu;
+void cpu_loop(CPUArchState *env);
+const char *target_strerror(int err);
+int get_osversion(void);
+void init_qemu_uname_release(void);
+void fork_start(void);
+void fork_end(int child);
+
+/**
+ * probe_guest_base:
+ * @image_name: the executable being loaded
+ * @loaddr: the lowest fixed address in the executable
+ * @hiaddr: the highest fixed address in the executable
+ *
+ * Creates the initial guest address space in the host memory space.
+ *
+ * If @loaddr == 0, then no address in the executable is fixed,
+ * i.e. it is fully relocatable.  In that case @hiaddr is the size
+ * of the executable.
+ *
+ * This function will not return if a valid value for guest_base
+ * cannot be chosen.  On return, the executable loader can expect
+ *
+ *    target_mmap(loaddr, hiaddr - loaddr, ...)
+ *
+ * to succeed.
+ */
+void probe_guest_base(const char *image_name,
+                      abi_ulong loaddr, abi_ulong hiaddr);
+
+/* syscall.c */
+int host_to_target_waitstatus(int status);
+
+#ifdef TARGET_I386
+/* vm86.c */
+void save_v86_state(CPUX86State *env);
+void handle_vm86_trap(CPUX86State *env, int trapno);
+void handle_vm86_fault(CPUX86State *env);
+int do_vm86(CPUX86State *env, long subfunction, abi_ulong v86_addr);
+#elif defined(TARGET_SPARC64)
+void sparc64_set_context(CPUSPARCState *env);
+void sparc64_get_context(CPUSPARCState *env);
+#endif
+
+static inline int is_error(abi_long ret)
+{
+    return (abi_ulong)ret >= (abi_ulong)(-4096);
+}
+
+#if TARGET_ABI_BITS == 32
+static inline uint64_t target_offset64(uint32_t word0, uint32_t word1)
+{
+#ifdef TARGET_WORDS_BIGENDIAN
+    return ((uint64_t)word0 << 32) | word1;
+#else
+    return ((uint64_t)word1 << 32) | word0;
+#endif
+}
+#else /* TARGET_ABI_BITS == 32 */
+static inline uint64_t target_offset64(uint64_t word0, uint64_t word1)
+{
+    return word0;
+}
+#endif /* TARGET_ABI_BITS != 32 */
+
+void print_termios(void *arg);
+
+/* ARM EABI and MIPS expect 64bit types aligned even on pairs or registers */
+#ifdef TARGET_ARM
+static inline int regpairs_aligned(void *cpu_env, int num)
+{
+    return ((((CPUARMState *)cpu_env)->eabi) == 1) ;
+}
+#elif defined(TARGET_MIPS) && (TARGET_ABI_BITS == 32)
+static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
+#elif defined(TARGET_PPC) && !defined(TARGET_PPC64)
+/*
+ * SysV AVI for PPC32 expects 64bit parameters to be passed on odd/even pairs
+ * of registers which translates to the same as ARM/MIPS, because we start with
+ * r3 as arg1
+ */
+static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
+#elif defined(TARGET_SH4)
+/* SH4 doesn't align register pairs, except for p{read,write}64 */
+static inline int regpairs_aligned(void *cpu_env, int num)
+{
+    switch (num) {
+    case TARGET_NR_pread64:
+    case TARGET_NR_pwrite64:
+        return 1;
+
+    default:
+        return 0;
+    }
+}
+#elif defined(TARGET_XTENSA)
+static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
+#elif defined(TARGET_HEXAGON)
+static inline int regpairs_aligned(void *cpu_env, int num) { return 1; }
+#else
+static inline int regpairs_aligned(void *cpu_env, int num) { return 0; }
+#endif
+
+/**
+ * preexit_cleanup: housekeeping before the guest exits
+ *
+ * env: the CPU state
+ * code: the exit code
+ */
+void preexit_cleanup(CPUArchState *env, int code);
+
+/*
+ * Include target-specific struct and function definitions;
+ * they may need access to the target-independent structures
+ * above, so include them last.
+ */
+#include "target_cpu.h"
+#include "target_structs.h"
+
+#endif

linux-user/user-mmap.h

@@ -0,0 +1,34 @@
+/*
+ * user-mmap.h: prototypes for linux-user guest binary loader
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef LINUX_USER_USER_MMAP_H
+#define LINUX_USER_USER_MMAP_H
+
+int target_mprotect(abi_ulong start, abi_ulong len, int prot);
+abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
+                     int flags, int fd, abi_ulong offset);
+int target_munmap(abi_ulong start, abi_ulong len);
+abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
+                       abi_ulong new_size, unsigned long flags,
+                       abi_ulong new_addr);
+extern unsigned long last_brk;
+extern abi_ulong mmap_next_start;
+abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong);
+void mmap_fork_start(void);
+void mmap_fork_end(int child);
+
+#endif /* LINUX_USER_USER_MMAP_H */

linux-user/vm86.c

@@ -19,6 +19,7 @@
 #include "qemu/osdep.h"
 
 #include "qemu.h"
+#include "user-internals.h"
 
 //#define DEBUG_VM86
 

linux-user/xtensa/cpu_loop.c

@@ -19,7 +19,9 @@
 
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "cpu_loop-common.h"
+#include "signal-common.h"
 
 static void xtensa_rfw(CPUXtensaState *env)
 {

linux-user/xtensa/signal.c

@@ -18,6 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "qemu.h"
+#include "user-internals.h"
 #include "signal-common.h"
 #include "linux-user/trace.h"
 

semihosting/arm-compat-semi.c

@@ -37,12 +37,12 @@
 #include "semihosting/console.h"
 #include "semihosting/common-semi.h"
 #include "qemu/timer.h"
+#include "exec/gdbstub.h"
 #ifdef CONFIG_USER_ONLY
 #include "qemu.h"
 
 #define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024)
 #else
-#include "exec/gdbstub.h"
 #include "qemu/cutils.h"
 #ifdef TARGET_ARM
 #include "hw/arm/boot.h"

target/m68k/m68k-semi.c

@@ -20,11 +20,11 @@
 #include "qemu/osdep.h"
 
 #include "cpu.h"
+#include "exec/gdbstub.h"
 #if defined(CONFIG_USER_ONLY)
 #include "qemu.h"
 #define SEMIHOSTING_HEAP_SIZE (128 * 1024 * 1024)
 #else
-#include "exec/gdbstub.h"
 #include "exec/softmmu-semi.h"
 #include "hw/boards.h"
 #endif

target/nios2/nios2-semi.c

@@ -24,11 +24,11 @@
 #include "qemu/osdep.h"
 
 #include "cpu.h"
+#include "exec/gdbstub.h"
 #if defined(CONFIG_USER_ONLY)
 #include "qemu.h"
 #else
 #include "qemu-common.h"
-#include "exec/gdbstub.h"
 #include "exec/softmmu-semi.h"
 #endif
 #include "qemu/log.h"

thunk.c

@@ -17,6 +17,7 @@
  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  */
 #include "qemu/osdep.h"
+#include "qemu/log.h"
 
 #include "qemu.h"
 #include "exec/user/thunk.h"