Merge remote-tracking branch 'riku/linux-user-for-upstream' into staging

# By Peter Maydell (5) and others
# Via Riku Voipio
* riku/linux-user-for-upstream:
  linux-user/syscall.c: Don't warn about unimplemented get_robust_list
  linux-user: Implement accept4
  linux-user: Implement sendfile and sendfile64
  linux-user: make bogus negative iovec lengths fail EINVAL
  linux-user: Fix layout of usage table to account for option text
  linux-user: Add more sparc syscall numbers
  linux-user: Support setgroups syscall with no groups
  linux-user: fix futex strace of FUTEX_CLOCK_REALTIME
  linux-user/syscall.c: handle FUTEX_WAIT_BITSET in do_futex
  linux-user: improve print_fcntl()
  linux-user: Add Alpha socket constants

configure

@@ -2764,6 +2764,20 @@ if compile_prog "" "" ; then
   epoll_pwait=yes
 fi
 
+# check for sendfile support
+sendfile=no
+cat > $TMPC << EOF
+#include <sys/sendfile.h>
+
+int main(void)
+{
+    return sendfile(0, 0, 0, 0);
+}
+EOF
+if compile_prog "" "" ; then
+  sendfile=yes
+fi
+
 # Check if tools are available to build documentation.
 if test "$docs" != "no" ; then
   if has makeinfo && has pod2man; then
@@ -3633,6 +3647,9 @@ fi
 if test "$epoll_pwait" = "yes" ; then
   echo "CONFIG_EPOLL_PWAIT=y" >> $config_host_mak
 fi
+if test "$sendfile" = "yes" ; then
+  echo "CONFIG_SENDFILE=y" >> $config_host_mak
+fi
 if test "$inotify" = "yes" ; then
   echo "CONFIG_INOTIFY=y" >> $config_host_mak
 fi

linux-user/main.c

@@ -3406,27 +3406,35 @@ static void usage(void)
            "Options and associated environment variables:\n"
            "\n");
 
-    maxarglen = maxenvlen = 0;
+    /* Calculate column widths. We must always have at least enough space
+     * for the column header.
+     */
+    maxarglen = strlen("Argument");
+    maxenvlen = strlen("Env-variable");
 
     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
+        int arglen = strlen(arginfo->argv);
+        if (arginfo->has_arg) {
+            arglen += strlen(arginfo->example) + 1;
+        }
         if (strlen(arginfo->env) > maxenvlen) {
             maxenvlen = strlen(arginfo->env);
         }
-        if (strlen(arginfo->argv) > maxarglen) {
-            maxarglen = strlen(arginfo->argv);
+        if (arglen > maxarglen) {
+            maxarglen = arglen;
         }
     }
 
-    printf("%-*s%-*sDescription\n", maxarglen+3, "Argument",
-            maxenvlen+1, "Env-variable");
+    printf("%-*s %-*s Description\n", maxarglen+1, "Argument",
+            maxenvlen, "Env-variable");
 
     for (arginfo = arg_table; arginfo->handle_opt != NULL; arginfo++) {
         if (arginfo->has_arg) {
             printf("-%s %-*s %-*s %s\n", arginfo->argv,
-                    (int)(maxarglen-strlen(arginfo->argv)), arginfo->example,
-                    maxenvlen, arginfo->env, arginfo->help);
+                   (int)(maxarglen - strlen(arginfo->argv) - 1),
+                   arginfo->example, maxenvlen, arginfo->env, arginfo->help);
         } else {
-            printf("-%-*s %-*s %s\n", maxarglen+1, arginfo->argv,
+            printf("-%-*s %-*s %s\n", maxarglen, arginfo->argv,
                     maxenvlen, arginfo->env,
                     arginfo->help);
         }

linux-user/socket.h

@@ -87,6 +87,75 @@
 
 	#define TARGET_SOCK_MAX (SOCK_PACKET + 1)
 
+#elif defined(TARGET_ALPHA)
+
+    /* For setsockopt(2) */
+    #define TARGET_SOL_SOCKET   0xffff
+
+    #define TARGET_SO_DEBUG 0x0001
+    #define TARGET_SO_REUSEADDR 0x0004
+    #define TARGET_SO_KEEPALIVE 0x0008
+    #define TARGET_SO_DONTROUTE 0x0010
+    #define TARGET_SO_BROADCAST 0x0020
+    #define TARGET_SO_LINGER    0x0080
+    #define TARGET_SO_OOBINLINE 0x0100
+    /* To add :#define TARGET_SO_REUSEPORT 0x0200 */
+
+    #define TARGET_SO_TYPE      0x1008
+    #define TARGET_SO_ERROR 0x1007
+    #define TARGET_SO_SNDBUF    0x1001
+    #define TARGET_SO_RCVBUF    0x1002
+    #define TARGET_SO_SNDBUFFORCE   0x100a
+    #define TARGET_SO_RCVBUFFORCE   0x100b
+    #define TARGET_SO_RCVLOWAT  0x1010
+    #define TARGET_SO_SNDLOWAT  0x1011
+    #define TARGET_SO_RCVTIMEO  0x1012
+    #define TARGET_SO_SNDTIMEO  0x1013
+    #define TARGET_SO_ACCEPTCONN    0x1014
+    #define TARGET_SO_PROTOCOL  0x1028
+    #define TARGET_SO_DOMAIN    0x1029
+
+    /* linux-specific, might as well be the same as on i386 */
+    #define TARGET_SO_NO_CHECK  11
+    #define TARGET_SO_PRIORITY  12
+    #define TARGET_SO_BSDCOMPAT 14
+
+    #define TARGET_SO_PASSCRED  17
+    #define TARGET_SO_PEERCRED  18
+    #define TARGET_SO_BINDTODEVICE 25
+
+    /* Socket filtering */
+    #define TARGET_SO_ATTACH_FILTER        26
+    #define TARGET_SO_DETACH_FILTER        27
+
+    #define TARGET_SO_PEERNAME      28
+    #define TARGET_SO_TIMESTAMP     29
+    #define TARGET_SCM_TIMESTAMP        TARGET_SO_TIMESTAMP
+
+    #define TARGET_SO_PEERSEC       30
+    #define TARGET_SO_PASSSEC       34
+    #define TARGET_SO_TIMESTAMPNS       35
+    #define TARGET_SCM_TIMESTAMPNS      TARGET_SO_TIMESTAMPNS
+
+    /* Security levels - as per NRL IPv6 - don't actually do anything */
+    #define TARGET_SO_SECURITY_AUTHENTICATION       19
+    #define TARGET_SO_SECURITY_ENCRYPTION_TRANSPORT 20
+    #define TARGET_SO_SECURITY_ENCRYPTION_NETWORK       21
+
+    #define TARGET_SO_MARK          36
+
+    #define TARGET_SO_TIMESTAMPING      37
+    #define TARGET_SCM_TIMESTAMPING TARGET_SO_TIMESTAMPING
+
+    #define TARGET_SO_RXQ_OVFL             40
+
+    #define TARGET_SO_WIFI_STATUS       41
+    #define TARGET_SCM_WIFI_STATUS      TARGET_SO_WIFI_STATUS
+    #define TARGET_SO_PEEK_OFF      42
+
+    /* Instruct lower device to use last 4-bytes of skb data as FCS */
+    #define TARGET_SO_NOFCS     43
+
 #else
 
 	/* For setsockopt(2) */

linux-user/sparc/syscall_nr.h

@@ -200,6 +200,8 @@
 #define TARGET_NR__newselect         230 /* Linux Specific                              */
 #define TARGET_NR_time               231 /* Linux Specific                              */
 #define TARGET_NR_stime              233 /* Linux Specific                              */
+#define TARGET_NR_statfs64           234 /* Linux Specific                              */
+#define TARGET_NR_fstatfs64          235 /* Linux Specific                              */
 #define TARGET_NR__llseek            236 /* Linux Specific                              */
 #define TARGET_NR_mlock              237
 #define TARGET_NR_munlock            238

linux-user/strace.c

@@ -462,18 +462,6 @@ UNUSED static struct flags mmap_flags[] = {
     FLAG_END,
 };
 
-UNUSED static struct flags fcntl_flags[] = {
-    FLAG_TARGET(F_DUPFD),
-    FLAG_TARGET(F_GETFD),
-    FLAG_TARGET(F_SETFD),
-    FLAG_TARGET(F_GETFL),
-    FLAG_TARGET(F_SETFL),
-    FLAG_TARGET(F_GETLK),
-    FLAG_TARGET(F_SETLK),
-    FLAG_TARGET(F_SETLKW),
-    FLAG_END,
-};
-
 UNUSED static struct flags clone_flags[] = {
     FLAG_GENERIC(CLONE_VM),
     FLAG_GENERIC(CLONE_FS),
@@ -867,12 +855,85 @@ print_fcntl(const struct syscallname *name,
 {
     print_syscall_prologue(name);
     print_raw_param("%d", arg0, 0);
-    print_flags(fcntl_flags, arg1, 0);
-    /*
-     * TODO: check flags and print following argument only
-     *       when needed.
-     */
-    print_pointer(arg2, 1);
+    switch(arg1) {
+    case TARGET_F_DUPFD:
+        gemu_log("F_DUPFD,");
+        print_raw_param(TARGET_ABI_FMT_ld, arg2, 1);
+        break;
+    case TARGET_F_GETFD:
+        gemu_log("F_GETFD");
+        break;
+    case TARGET_F_SETFD:
+        gemu_log("F_SETFD,");
+        print_raw_param(TARGET_ABI_FMT_ld, arg2, 1);
+        break;
+    case TARGET_F_GETFL:
+        gemu_log("F_GETFL");
+        break;
+    case TARGET_F_SETFL:
+        gemu_log("F_SETFL,");
+        print_open_flags(arg2, 1);
+        break;
+    case TARGET_F_GETLK:
+        gemu_log("F_GETLK,");
+        print_pointer(arg2, 1);
+        break;
+    case TARGET_F_SETLK:
+        gemu_log("F_SETLK,");
+        print_pointer(arg2, 1);
+        break;
+    case TARGET_F_SETLKW:
+        gemu_log("F_SETLKW,");
+        print_pointer(arg2, 1);
+        break;
+    case TARGET_F_GETOWN:
+        gemu_log("F_GETOWN");
+        break;
+    case TARGET_F_SETOWN:
+        gemu_log("F_SETOWN,");
+        print_raw_param(TARGET_ABI_FMT_ld, arg2, 0);
+        break;
+    case TARGET_F_GETSIG:
+        gemu_log("F_GETSIG");
+        break;
+    case TARGET_F_SETSIG:
+        gemu_log("F_SETSIG,");
+        print_raw_param(TARGET_ABI_FMT_ld, arg2, 0);
+        break;
+#if TARGET_ABI_BITS == 32
+    case TARGET_F_GETLK64:
+        gemu_log("F_GETLK64,");
+        print_pointer(arg2, 1);
+        break;
+    case TARGET_F_SETLK64:
+        gemu_log("F_SETLK64,");
+        print_pointer(arg2, 1);
+        break;
+    case TARGET_F_SETLKW64:
+        gemu_log("F_SETLKW64,");
+        print_pointer(arg2, 1);
+        break;
+#endif
+    case TARGET_F_SETLEASE:
+        gemu_log("F_SETLEASE,");
+        print_raw_param(TARGET_ABI_FMT_ld, arg2, 0);
+        break;
+    case TARGET_F_GETLEASE:
+        gemu_log("F_GETLEASE");
+        break;
+    case TARGET_F_DUPFD_CLOEXEC:
+        gemu_log("F_DUPFD_CLOEXEC,");
+        print_raw_param(TARGET_ABI_FMT_ld, arg2, 1);
+        break;
+    case TARGET_F_NOTIFY:
+        gemu_log("F_NOTIFY,");
+        print_raw_param(TARGET_ABI_FMT_ld, arg2, 0);
+        break;
+    default:
+        print_raw_param(TARGET_ABI_FMT_ld, arg1, 0);
+        print_pointer(arg2, 1);
+        break;
+    }
     print_syscall_epilogue(name);
 }
 #define print_fcntl64   print_fcntl
@@ -1436,6 +1497,12 @@ if( cmd == val ) { \
         gemu_log("FUTEX_PRIVATE_FLAG|");
         cmd &= ~FUTEX_PRIVATE_FLAG;
     }
+#endif
+#ifdef FUTEX_CLOCK_REALTIME
+    if (cmd & FUTEX_CLOCK_REALTIME) {
+        gemu_log("FUTEX_CLOCK_REALTIME|");
+        cmd &= ~FUTEX_CLOCK_REALTIME;
+    }
 #endif
     print_op(FUTEX_WAIT)
     print_op(FUTEX_WAKE)

linux-user/syscall.c

@@ -78,6 +78,9 @@ int __clone2(int (*fn)(void *), void *child_stack_base,
 #ifdef CONFIG_ATTR
 #include "qemu/xattr.h"
 #endif
+#ifdef CONFIG_SENDFILE
+#include <sys/sendfile.h>
+#endif
 
 #define termios host_termios
 #define winsize host_winsize
@@ -1776,7 +1779,7 @@ static struct iovec *lock_iovec(int type, abi_ulong target_addr,
         errno = 0;
         return NULL;
     }
-    if (count > IOV_MAX) {
+    if (count < 0 || count > IOV_MAX) {
         errno = EINVAL;
         return NULL;
     }
@@ -2001,16 +2004,30 @@ out2:
     return ret;
 }
 
-/* do_accept() Must return target values and target errnos. */
-static abi_long do_accept(int fd, abi_ulong target_addr,
-                          abi_ulong target_addrlen_addr)
+/* If we don't have a system accept4() then just call accept.
+ * The callsites to do_accept4() will ensure that they don't
+ * pass a non-zero flags argument in this config.
+ */
+#ifndef CONFIG_ACCEPT4
+static inline int accept4(int sockfd, struct sockaddr *addr,
+                          socklen_t *addrlen, int flags)
+{
+    assert(flags == 0);
+    return accept(sockfd, addr, addrlen);
+}
+#endif
+
+/* do_accept4() Must return target values and target errnos. */
+static abi_long do_accept4(int fd, abi_ulong target_addr,
+                           abi_ulong target_addrlen_addr, int flags)
 {
     socklen_t addrlen;
     void *addr;
     abi_long ret;
 
-    if (target_addr == 0)
-       return get_errno(accept(fd, NULL, NULL));
+    if (target_addr == 0) {
+        return get_errno(accept4(fd, NULL, NULL, flags));
+    }
 
     /* linux returns EINVAL if addrlen pointer is invalid */
     if (get_user_u32(addrlen, target_addrlen_addr))
@@ -2025,7 +2042,7 @@ static abi_long do_accept(int fd, abi_ulong target_addr,
 
     addr = alloca(addrlen);
 
-    ret = get_errno(accept(fd, addr, &addrlen));
+    ret = get_errno(accept4(fd, addr, &addrlen, flags));
     if (!is_error(ret)) {
         host_to_target_sockaddr(target_addr, addr, addrlen);
         if (put_user_u32(addrlen, target_addrlen_addr))
@@ -2251,7 +2268,7 @@ static abi_long do_socketcall(int num, abi_ulong vptr)
                 || get_user_ual(target_addrlen, vptr + 2 * n))
                 return -TARGET_EFAULT;
 
-            ret = do_accept(sockfd, target_addr, target_addrlen);
+            ret = do_accept4(sockfd, target_addr, target_addrlen, 0);
         }
         break;
     case SOCKOP_getsockname:
@@ -4922,6 +4939,7 @@ static int do_futex(target_ulong uaddr, int op, int val, target_ulong timeout,
 #endif
     switch (base_op) {
     case FUTEX_WAIT:
+    case FUTEX_WAIT_BITSET:
         if (timeout) {
             pts = &ts;
             target_to_host_timespec(pts, timeout);
@@ -4929,7 +4947,7 @@ static int do_futex(target_ulong uaddr, int op, int val, target_ulong timeout,
             pts = NULL;
         }
         return get_errno(sys_futex(g2h(uaddr), op, tswap32(val),
-                         pts, NULL, 0));
+                         pts, NULL, val3));
     case FUTEX_WAKE:
         return get_errno(sys_futex(g2h(uaddr), op, val, NULL, NULL, 0));
     case FUTEX_FD:
@@ -6673,7 +6691,16 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #endif
 #ifdef TARGET_NR_accept
     case TARGET_NR_accept:
-        ret = do_accept(arg1, arg2, arg3);
+        ret = do_accept4(arg1, arg2, arg3, 0);
+        break;
+#endif
+#ifdef TARGET_NR_accept4
+    case TARGET_NR_accept4:
+#ifdef CONFIG_ACCEPT4
+        ret = do_accept4(arg1, arg2, arg3, arg4);
+#else
+        goto unimplemented;
+#endif
         break;
 #endif
 #ifdef TARGET_NR_bind
@@ -7530,8 +7557,58 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 #else
         goto unimplemented;
 #endif
+
+#ifdef CONFIG_SENDFILE
+    case TARGET_NR_sendfile:
+    {
+        off_t *offp = NULL;
+        off_t off;
+        if (arg3) {
+            ret = get_user_sal(off, arg3);
+            if (is_error(ret)) {
+                break;
+            }
+            offp = &off;
+        }
+        ret = get_errno(sendfile(arg1, arg2, offp, arg4));
+        if (!is_error(ret) && arg3) {
+            abi_long ret2 = put_user_sal(off, arg3);
+            if (is_error(ret2)) {
+                ret = ret2;
+            }
+        }
+        break;
+    }
+#ifdef TARGET_NR_sendfile64
+    case TARGET_NR_sendfile64:
+    {
+        off_t *offp = NULL;
+        off_t off;
+        if (arg3) {
+            ret = get_user_s64(off, arg3);
+            if (is_error(ret)) {
+                break;
+            }
+            offp = &off;
+        }
+        ret = get_errno(sendfile(arg1, arg2, offp, arg4));
+        if (!is_error(ret) && arg3) {
+            abi_long ret2 = put_user_s64(off, arg3);
+            if (is_error(ret2)) {
+                ret = ret2;
+            }
+        }
+        break;
+    }
+#endif
+#else
     case TARGET_NR_sendfile:
+#ifdef TARGET_NR_sendfile64:
+    case TARGET_NR_sendfile64:
+#endif
         goto unimplemented;
+#endif
+
 #ifdef TARGET_NR_getpmsg
     case TARGET_NR_getpmsg:
         goto unimplemented;
@@ -7679,18 +7756,20 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
         {
             int gidsetsize = arg1;
             target_id *target_grouplist;
-            gid_t *grouplist;
+            gid_t *grouplist = NULL;
             int i;
-
-            grouplist = alloca(gidsetsize * sizeof(gid_t));
-            target_grouplist = lock_user(VERIFY_READ, arg2, gidsetsize * 2, 1);
-            if (!target_grouplist) {
-                ret = -TARGET_EFAULT;
-                goto fail;
+            if (gidsetsize) {
+                grouplist = alloca(gidsetsize * sizeof(gid_t));
+                target_grouplist = lock_user(VERIFY_READ, arg2, gidsetsize * 2, 1);
+                if (!target_grouplist) {
+                    ret = -TARGET_EFAULT;
+                    goto fail;
+                }
+                for (i = 0; i < gidsetsize; i++) {
+                    grouplist[i] = low2highgid(tswapid(target_grouplist[i]));
+                }
+                unlock_user(target_grouplist, arg2, 0);
             }
-            for(i = 0;i < gidsetsize; i++)
-                grouplist[i] = low2highgid(tswapid(target_grouplist[i]));
-            unlock_user(target_grouplist, arg2, 0);
             ret = get_errno(setgroups(gidsetsize, grouplist));
         }
         break;
@@ -8552,7 +8631,20 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
 
 #ifdef TARGET_NR_set_robust_list
     case TARGET_NR_set_robust_list:
-	goto unimplemented_nowarn;
+    case TARGET_NR_get_robust_list:
+        /* The ABI for supporting robust futexes has userspace pass
+         * the kernel a pointer to a linked list which is updated by
+         * userspace after the syscall; the list is walked by the kernel
+         * when the thread exits. Since the linked list in QEMU guest
+         * memory isn't a valid linked list for the host and we have
+         * no way to reliably intercept the thread-death event, we can't
+         * support these. Silently return ENOSYS so that guest userspace
+         * falls back to a non-robust futex implementation (which should
+         * be OK except in the corner case of the guest crashing while
+         * holding a mutex that is shared with another process via
+         * shared memory).
+         */
+        goto unimplemented_nowarn;
 #endif
 
 #if defined(TARGET_NR_utimensat) && defined(__NR_utimensat)