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

* remotes/riku/linux-user-for-upstream:
  linux-user: fix getrusage and wait4 failures with invalid rusage struct
  linux-user/elfload.c: Support ARM HWCAP2 flags
  linux-user/elfload.c: Fix A64 code which was incorrectly acting like A32
  linux-user/elfload.c: Update ARM HWCAP bits
  linux-user/elfload.c: Fix incorrect ARM HWCAP bits
  linux-user: remove configure option for setting uname release
  linux-user: move uname functions to uname.c
  linux-user: rename cpu-uname -> uname
  linux-user/signal.c: Set fault address in AArch64 signal info
  linux-user: avoid using glibc internals in _syscall5 and in definition of target_sigevent struct
  linux-user: Handle arches with llseek instead of _llseek
  linux-user: Add support for SCM_CREDENTIALS.
  linux-user: Move if-elses to a switch statement.
  linux-user: Assert stack used for auxvec, envp, argv
  linux-user: Add /proc/self/exe open forwarding

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

11 files changed, 321 insertions, 159 deletions

diff --git a/configure b/configure
index 870c939f1d..8c50d78f87 100755
--- a/configure
+++ b/configure
@@ -285,7 +285,6 @@ softmmu="yes"
 linux_user="no"
 bsd_user="no"
 guest_base="yes"
-uname_release=""
 aix="no"
 blobs="yes"
 pkgversion=""
@@ -945,8 +944,6 @@ for opt do
   ;;
   --disable-pie) pie="no"
   ;;
-  --enable-uname-release=*) uname_release="$optarg"
-  ;;
   --enable-werror) werror="yes"
   ;;
   --disable-werror) werror="no"
@@ -1295,7 +1292,6 @@ Advanced options (experts only):
   --fmod-lib               path to FMOD library
   --fmod-inc               path to FMOD includes
   --oss-lib                path to OSS library
-  --enable-uname-release=R Return R for uname -r in usermode emulation
   --cpu=CPU                Build for host CPU [$cpu]
   --disable-uuid           disable uuid support
   --enable-uuid            enable uuid support
@@ -4128,8 +4124,6 @@ echo "xen support       $xen"
 echo "brlapi support    $brlapi"
 echo "bluez  support    $bluez"
 echo "Documentation     $docs"
-[ ! -z "$uname_release" ] && \
-echo "uname -r          $uname_release"
 echo "GUEST_BASE        $guest_base"
 echo "PIE               $pie"
 echo "vde support       $vde"
@@ -4544,8 +4538,6 @@ if [ "$bsd" = "yes" ] ; then
   echo "CONFIG_BSD=y" >> $config_host_mak
 fi
 
-echo "CONFIG_UNAME_RELEASE=\"$uname_release\"" >> $config_host_mak
-
 if test "$zero_malloc" = "yes" ; then
   echo "CONFIG_ZERO_MALLOC=y" >> $config_host_mak
 fi
diff --git a/include/elf.h b/include/elf.h
index 667af6fc63..1599ab22d8 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -254,6 +254,7 @@ typedef int64_t  Elf64_Sxword;
 #define AT_SECURE	23	/* boolean, was exec suid-like? */
 #define AT_BASE_PLATFORM 24	/* string identifying real platforms */
 #define AT_RANDOM	25	/* address of 16 random bytes */
+#define AT_HWCAP2       26      /* extension of AT_HWCAP */
 #define AT_EXECFN	31	/* filename of the executable */
 #define AT_SYSINFO	32	/* address of kernel entry point */
 #define AT_SYSINFO_EHDR	33	/* address of kernel vdso */
diff --git a/linux-user/Makefile.objs b/linux-user/Makefile.objs
index 5899d72d3e..fd5021788f 100644
--- a/linux-user/Makefile.objs
+++ b/linux-user/Makefile.objs
@@ -1,5 +1,5 @@
 obj-y = main.o syscall.o strace.o mmap.o signal.o \
-	elfload.o linuxload.o uaccess.o cpu-uname.o
+	elfload.o linuxload.o uaccess.o uname.o
 
 obj-$(TARGET_HAS_BFLT) += flatload.o
 obj-$(TARGET_I386) += vm86.o
diff --git a/linux-user/cpu-uname.h b/linux-user/cpu-uname.h
deleted file mode 100644
index 32492de71a..0000000000
--- a/linux-user/cpu-uname.h
+++ /dev/null
@@ -1 +0,0 @@
-const char *cpu_to_uname_machine(void *cpu_env);
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index d2380b6ccb..995f999768 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -20,6 +20,7 @@
 #undef ARCH_DLINFO
 #undef ELF_PLATFORM
 #undef ELF_HWCAP
+#undef ELF_HWCAP2
 #undef ELF_CLASS
 #undef ELF_DATA
 #undef ELF_ARCH
@@ -267,17 +268,15 @@ static void elf_core_copy_regs(target_elf_gregset_t *regs, const CPUX86State *en
 
 #ifdef TARGET_ARM
 
+#ifndef TARGET_AARCH64
+/* 32 bit ARM definitions */
+
 #define ELF_START_MMAP 0x80000000
 
 #define elf_check_arch(x) ((x) == ELF_MACHINE)
 
 #define ELF_ARCH        ELF_MACHINE
-
-#ifdef TARGET_AARCH64
-#define ELF_CLASS       ELFCLASS64
-#else
 #define ELF_CLASS       ELFCLASS32
-#endif
 
 static inline void init_thread(struct target_pt_regs *regs,
                                struct image_info *infop)
@@ -285,10 +284,6 @@ static inline void init_thread(struct target_pt_regs *regs,
     abi_long stack = infop->start_stack;
     memset(regs, 0, sizeof(*regs));
 
-#ifdef TARGET_AARCH64
-    regs->pc = infop->entry & ~0x3ULL;
-    regs->sp = stack;
-#else
     regs->ARM_cpsr = 0x10;
     if (infop->entry & 1)
         regs->ARM_cpsr |= CPSR_T;
@@ -302,7 +297,6 @@ static inline void init_thread(struct target_pt_regs *regs,
     /* For uClinux PIC binaries.  */
     /* XXX: Linux does this only on ARM with no MMU (do we care ?) */
     regs->ARM_r10 = infop->start_data;
-#endif
 }
 
 #define ELF_NREG    18
@@ -346,13 +340,28 @@ enum
     ARM_HWCAP_ARM_EDSP      = 1 << 7,
     ARM_HWCAP_ARM_JAVA      = 1 << 8,
     ARM_HWCAP_ARM_IWMMXT    = 1 << 9,
-    ARM_HWCAP_ARM_THUMBEE   = 1 << 10,
-    ARM_HWCAP_ARM_NEON      = 1 << 11,
-    ARM_HWCAP_ARM_VFPv3     = 1 << 12,
-    ARM_HWCAP_ARM_VFPv3D16  = 1 << 13,
+    ARM_HWCAP_ARM_CRUNCH    = 1 << 10,
+    ARM_HWCAP_ARM_THUMBEE   = 1 << 11,
+    ARM_HWCAP_ARM_NEON      = 1 << 12,
+    ARM_HWCAP_ARM_VFPv3     = 1 << 13,
+    ARM_HWCAP_ARM_VFPv3D16  = 1 << 14,
+    ARM_HWCAP_ARM_TLS       = 1 << 15,
+    ARM_HWCAP_ARM_VFPv4     = 1 << 16,
+    ARM_HWCAP_ARM_IDIVA     = 1 << 17,
+    ARM_HWCAP_ARM_IDIVT     = 1 << 18,
+    ARM_HWCAP_ARM_VFPD32    = 1 << 19,
+    ARM_HWCAP_ARM_LPAE      = 1 << 20,
+    ARM_HWCAP_ARM_EVTSTRM   = 1 << 21,
+};
+
+enum {
+    ARM_HWCAP2_ARM_AES      = 1 << 0,
+    ARM_HWCAP2_ARM_PMULL    = 1 << 1,
+    ARM_HWCAP2_ARM_SHA1     = 1 << 2,
+    ARM_HWCAP2_ARM_SHA2     = 1 << 3,
+    ARM_HWCAP2_ARM_CRC32    = 1 << 4,
 };
 
-#ifndef TARGET_AARCH64
 /* The commpage only exists for 32 bit kernels */
 
 #define TARGET_HAS_VALIDATE_GUEST_SPACE
@@ -414,9 +423,9 @@ static int validate_guest_space(unsigned long guest_base,
 
     return 1; /* All good */
 }
-#endif
 
 #define ELF_HWCAP get_elf_hwcap()
+#define ELF_HWCAP2 get_elf_hwcap2()
 
 static uint32_t get_elf_hwcap(void)
 {
@@ -427,23 +436,114 @@ static uint32_t get_elf_hwcap(void)
     hwcaps |= ARM_HWCAP_ARM_HALF;
     hwcaps |= ARM_HWCAP_ARM_THUMB;
     hwcaps |= ARM_HWCAP_ARM_FAST_MULT;
-    hwcaps |= ARM_HWCAP_ARM_FPA;
 
     /* probe for the extra features */
 #define GET_FEATURE(feat, hwcap) \
     do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0)
+    /* EDSP is in v5TE and above, but all our v5 CPUs are v5TE */
+    GET_FEATURE(ARM_FEATURE_V5, ARM_HWCAP_ARM_EDSP);
     GET_FEATURE(ARM_FEATURE_VFP, ARM_HWCAP_ARM_VFP);
     GET_FEATURE(ARM_FEATURE_IWMMXT, ARM_HWCAP_ARM_IWMMXT);
     GET_FEATURE(ARM_FEATURE_THUMB2EE, ARM_HWCAP_ARM_THUMBEE);
     GET_FEATURE(ARM_FEATURE_NEON, ARM_HWCAP_ARM_NEON);
     GET_FEATURE(ARM_FEATURE_VFP3, ARM_HWCAP_ARM_VFPv3);
-    GET_FEATURE(ARM_FEATURE_VFP_FP16, ARM_HWCAP_ARM_VFPv3D16);
+    GET_FEATURE(ARM_FEATURE_V6K, ARM_HWCAP_ARM_TLS);
+    GET_FEATURE(ARM_FEATURE_VFP4, ARM_HWCAP_ARM_VFPv4);
+    GET_FEATURE(ARM_FEATURE_ARM_DIV, ARM_HWCAP_ARM_IDIVA);
+    GET_FEATURE(ARM_FEATURE_THUMB_DIV, ARM_HWCAP_ARM_IDIVT);
+    /* All QEMU's VFPv3 CPUs have 32 registers, see VFP_DREG in translate.c.
+     * Note that the ARM_HWCAP_ARM_VFPv3D16 bit is always the inverse of
+     * ARM_HWCAP_ARM_VFPD32 (and so always clear for QEMU); it is unrelated
+     * to our VFP_FP16 feature bit.
+     */
+    GET_FEATURE(ARM_FEATURE_VFP3, ARM_HWCAP_ARM_VFPD32);
+    GET_FEATURE(ARM_FEATURE_LPAE, ARM_HWCAP_ARM_LPAE);
+
+    return hwcaps;
+}
+
+static uint32_t get_elf_hwcap2(void)
+{
+    ARMCPU *cpu = ARM_CPU(thread_cpu);
+    uint32_t hwcaps = 0;
+
+    GET_FEATURE(ARM_FEATURE_V8_AES, ARM_HWCAP2_ARM_AES);
+    GET_FEATURE(ARM_FEATURE_CRC, ARM_HWCAP2_ARM_CRC32);
+    return hwcaps;
+}
+
+#undef GET_FEATURE
+
+#else
+/* 64 bit ARM definitions */
+#define ELF_START_MMAP 0x80000000
+
+#define elf_check_arch(x) ((x) == ELF_MACHINE)
+
+#define ELF_ARCH        ELF_MACHINE
+#define ELF_CLASS       ELFCLASS64
+#define ELF_PLATFORM    "aarch64"
+
+static inline void init_thread(struct target_pt_regs *regs,
+                               struct image_info *infop)
+{
+    abi_long stack = infop->start_stack;
+    memset(regs, 0, sizeof(*regs));
+
+    regs->pc = infop->entry & ~0x3ULL;
+    regs->sp = stack;
+}
+
+#define ELF_NREG    34
+typedef target_elf_greg_t  target_elf_gregset_t[ELF_NREG];
+
+static void elf_core_copy_regs(target_elf_gregset_t *regs,
+                               const CPUARMState *env)
+{
+    int i;
+
+    for (i = 0; i < 32; i++) {
+        (*regs)[i] = tswapreg(env->xregs[i]);
+    }
+    (*regs)[32] = tswapreg(env->pc);
+    (*regs)[33] = tswapreg(pstate_read((CPUARMState *)env));
+}
+
+#define USE_ELF_CORE_DUMP
+#define ELF_EXEC_PAGESIZE       4096
+
+enum {
+    ARM_HWCAP_A64_FP            = 1 << 0,
+    ARM_HWCAP_A64_ASIMD         = 1 << 1,
+    ARM_HWCAP_A64_EVTSTRM       = 1 << 2,
+    ARM_HWCAP_A64_AES           = 1 << 3,
+    ARM_HWCAP_A64_PMULL         = 1 << 4,
+    ARM_HWCAP_A64_SHA1          = 1 << 5,
+    ARM_HWCAP_A64_SHA2          = 1 << 6,
+    ARM_HWCAP_A64_CRC32         = 1 << 7,
+};
+
+#define ELF_HWCAP get_elf_hwcap()
+
+static uint32_t get_elf_hwcap(void)
+{
+    ARMCPU *cpu = ARM_CPU(thread_cpu);
+    uint32_t hwcaps = 0;
+
+    hwcaps |= ARM_HWCAP_A64_FP;
+    hwcaps |= ARM_HWCAP_A64_ASIMD;
+
+    /* probe for the extra features */
+#define GET_FEATURE(feat, hwcap) \
+    do { if (arm_feature(&cpu->env, feat)) { hwcaps |= hwcap; } } while (0)
+    GET_FEATURE(ARM_FEATURE_V8_AES, ARM_HWCAP_A64_PMULL);
 #undef GET_FEATURE
 
     return hwcaps;
 }
 
-#endif
+#endif /* not TARGET_AARCH64 */
+#endif /* TARGET_ARM */
 
 #ifdef TARGET_UNICORE32
 
@@ -1407,6 +1507,9 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
 #ifdef DLINFO_ARCH_ITEMS
     size += DLINFO_ARCH_ITEMS * 2;
 #endif
+#ifdef ELF_HWCAP2
+    size += 2;
+#endif
     size += envc + argc + 2;
     size += 1;  /* argc itself */
     size *= n;
@@ -1440,6 +1543,10 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
     NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK));
     NEW_AUX_ENT(AT_RANDOM, (abi_ulong) u_rand_bytes);
 
+#ifdef ELF_HWCAP2
+    NEW_AUX_ENT(AT_HWCAP2, (abi_ulong) ELF_HWCAP2);
+#endif
+
     if (k_platform)
         NEW_AUX_ENT(AT_PLATFORM, u_platform);
 #ifdef ARCH_DLINFO
@@ -1455,6 +1562,8 @@ static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc,
     info->auxv_len = sp_auxv - sp;
 
     sp = loader_build_argptr(envc, argc, sp, p, 0);
+    /* Check the right amount of stack was allocated for auxvec, envp & argv. */
+    assert(sp_auxv - sp == size);
     return sp;
 }
 
diff --git a/linux-user/main.c b/linux-user/main.c
index 947358a886..c38fecfdd9 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -69,7 +69,7 @@ unsigned long reserved_va;
 static void usage(void);
 
 static const char *interp_prefix = CONFIG_QEMU_INTERP_PREFIX;
-const char *qemu_uname_release = CONFIG_UNAME_RELEASE;
+const char *qemu_uname_release;
 
 /* XXX: on x86 MAP_GROWSDOWN only works if ESP <= address + 32, so
    we allocate a bigger stack. Need a better solution, for example
diff --git a/linux-user/signal.c b/linux-user/signal.c
index 7d6246f448..5b8a01f998 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -1242,8 +1242,7 @@ static int target_setup_sigframe(struct target_rt_sigframe *sf,
     __put_user(env->pc, &sf->uc.tuc_mcontext.pc);
     __put_user(pstate_read(env), &sf->uc.tuc_mcontext.pstate);
 
-    __put_user(/*current->thread.fault_address*/ 0,
-            &sf->uc.tuc_mcontext.fault_address);
+    __put_user(env->exception.vaddress, &sf->uc.tuc_mcontext.fault_address);
 
     for (i = 0; i < TARGET_NSIG_WORDS; i++) {
         __put_user(set->sig[i], &sf->uc.tuc_sigmask.sig[i]);
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 9864813b7a..6efeeff2bf 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -60,7 +60,6 @@ int __clone2(int (*fn)(void *), void *child_stack_base,
 #include <sys/statfs.h>
 #include <utime.h>
 #include <sys/sysinfo.h>
-#include <sys/utsname.h>
 //#include <sys/user.h>
 #include <netinet/ip.h>
 #include <netinet/tcp.h>
@@ -92,7 +91,6 @@ int __clone2(int (*fn)(void *), void *child_stack_base,
 
 #include <linux/termios.h>
 #include <linux/unistd.h>
-#include <linux/utsname.h>
 #include <linux/cdrom.h>
 #include <linux/hdreg.h>
 #include <linux/soundcard.h>
@@ -110,7 +108,7 @@ int __clone2(int (*fn)(void *), void *child_stack_base,
 #include <linux/filter.h>
 #include <linux/blkpg.h>
 #include "linux_loop.h"
-#include "cpu-uname.h"
+#include "uname.h"
 
 #include "qemu.h"
 
@@ -198,6 +196,11 @@ static type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5,	\
 #define __NR__llseek __NR_lseek
 #endif
 
+/* Newer kernel ports have llseek() instead of _llseek() */
+#if defined(TARGET_NR_llseek) && !defined(TARGET_NR__llseek)
+#define TARGET_NR__llseek TARGET_NR_llseek
+#endif
+
 #ifdef __NR_gettid
 _syscall0(int, gettid)
 #else
@@ -282,40 +285,6 @@ static bitmask_transtbl fcntl_flags_tbl[] = {
   { 0, 0, 0, 0 }
 };
 
-#define COPY_UTSNAME_FIELD(dest, src) \
-  do { \
-      /* __NEW_UTS_LEN doesn't include terminating null */ \
-      (void) strncpy((dest), (src), __NEW_UTS_LEN); \
-      (dest)[__NEW_UTS_LEN] = '\0'; \
-  } while (0)
-
-static int sys_uname(struct new_utsname *buf)
-{
-  struct utsname uts_buf;
-
-  if (uname(&uts_buf) < 0)
-      return (-1);
-
-  /*
-   * Just in case these have some differences, we
-   * translate utsname to new_utsname (which is the
-   * struct linux kernel uses).
-   */
-
-  memset(buf, 0, sizeof(*buf));
-  COPY_UTSNAME_FIELD(buf->sysname, uts_buf.sysname);
-  COPY_UTSNAME_FIELD(buf->nodename, uts_buf.nodename);
-  COPY_UTSNAME_FIELD(buf->release, uts_buf.release);
-  COPY_UTSNAME_FIELD(buf->version, uts_buf.version);
-  COPY_UTSNAME_FIELD(buf->machine, uts_buf.machine);
-#ifdef _GNU_SOURCE
-  COPY_UTSNAME_FIELD(buf->domainname, uts_buf.domainname);
-#endif
-  return (0);
-
-#undef COPY_UTSNAME_FIELD
-}
-
 static int sys_getcwd1(char *buf, size_t size)
 {
   if (getcwd(buf, size) == NULL) {
@@ -406,7 +375,7 @@ static int sys_inotify_init1(int flags)
 #endif
 #define __NR_sys_ppoll __NR_ppoll
 _syscall5(int, sys_ppoll, struct pollfd *, fds, nfds_t, nfds,
-          struct timespec *, timeout, const __sigset_t *, sigmask,
+          struct timespec *, timeout, const sigset_t *, sigmask,
           size_t, sigsetsize)
 #endif
 
@@ -1242,25 +1211,51 @@ static inline abi_long host_to_target_cmsg(struct target_msghdr *target_msgh,
         target_cmsg->cmsg_type = tswap32(cmsg->cmsg_type);
         target_cmsg->cmsg_len = tswapal(TARGET_CMSG_LEN(len));
 
-        if ((cmsg->cmsg_level == SOL_SOCKET) &&
-                                (cmsg->cmsg_type == SCM_RIGHTS)) {
-            int *fd = (int *)data;
-            int *target_fd = (int *)target_data;
-            int i, numfds = len / sizeof(int);
+        switch (cmsg->cmsg_level) {
+        case SOL_SOCKET:
+            switch (cmsg->cmsg_type) {
+            case SCM_RIGHTS:
+            {
+                int *fd = (int *)data;
+                int *target_fd = (int *)target_data;
+                int i, numfds = len / sizeof(int);
 
-            for (i = 0; i < numfds; i++)
-                target_fd[i] = tswap32(fd[i]);
-        } else if ((cmsg->cmsg_level == SOL_SOCKET) &&
-                                (cmsg->cmsg_type == SO_TIMESTAMP) &&
-                                (len == sizeof(struct timeval))) {
-            /* copy struct timeval to target */
-            struct timeval *tv = (struct timeval *)data;
-            struct target_timeval *target_tv =
-                                        (struct target_timeval *)target_data;
-
-            target_tv->tv_sec = tswapal(tv->tv_sec);
-            target_tv->tv_usec = tswapal(tv->tv_usec);
-        } else {
+                for (i = 0; i < numfds; i++)
+                    target_fd[i] = tswap32(fd[i]);
+                break;
+            }
+            case SO_TIMESTAMP:
+            {
+                struct timeval *tv = (struct timeval *)data;
+                struct target_timeval *target_tv =
+                    (struct target_timeval *)target_data;
+
+                if (len != sizeof(struct timeval))
+                    goto unimplemented;
+
+                /* copy struct timeval to target */
+                target_tv->tv_sec = tswapal(tv->tv_sec);
+                target_tv->tv_usec = tswapal(tv->tv_usec);
+                break;
+            }
+            case SCM_CREDENTIALS:
+            {
+                struct ucred *cred = (struct ucred *)data;
+                struct target_ucred *target_cred =
+                    (struct target_ucred *)target_data;
+
+                __put_user(cred->pid, &target_cred->pid);
+                __put_user(cred->uid, &target_cred->uid);
+                __put_user(cred->gid, &target_cred->gid);
+                break;
+            }
+            default:
+                goto unimplemented;
+            }
+            break;
+
+        default:
+        unimplemented:
             gemu_log("Unsupported ancillary data: %d/%d\n",
                                         cmsg->cmsg_level, cmsg->cmsg_type);
             memcpy(target_data, data, len);
@@ -4952,72 +4947,6 @@ int host_to_target_waitstatus(int status)
     return status;
 }
 
-static int relstr_to_int(const char *s)
-{
-    /* Convert a uname release string like "2.6.18" to an integer
-     * of the form 0x020612. (Beware that 0x020612 is *not* 2.6.12.)
-     */
-    int i, n, tmp;
-
-    tmp = 0;
-    for (i = 0; i < 3; i++) {
-        n = 0;
-        while (*s >= '0' && *s <= '9') {
-            n *= 10;
-            n += *s - '0';
-            s++;
-        }
-        tmp = (tmp << 8) + n;
-        if (*s == '.') {
-            s++;
-        }
-    }
-    return tmp;
-}
-
-int get_osversion(void)
-{
-    static int osversion;
-    struct new_utsname buf;
-    const char *s;
-
-    if (osversion)
-        return osversion;
-    if (qemu_uname_release && *qemu_uname_release) {
-        s = qemu_uname_release;
-    } else {
-        if (sys_uname(&buf))
-            return 0;
-        s = buf.release;
-    }
-    osversion = relstr_to_int(s);
-    return osversion;
-}
-
-void init_qemu_uname_release(void)
-{
-    /* Initialize qemu_uname_release for later use.
-     * If the host kernel is too old and the user hasn't asked for
-     * a specific fake version number, we might want to fake a minimum
-     * target kernel version.
-     */
-#ifdef UNAME_MINIMUM_RELEASE
-    struct new_utsname buf;
-
-    if (qemu_uname_release && *qemu_uname_release) {
-        return;
-    }
-
-    if (sys_uname(&buf)) {
-        return;
-    }
-
-    if (relstr_to_int(buf.release) < relstr_to_int(UNAME_MINIMUM_RELEASE)) {
-        qemu_uname_release = UNAME_MINIMUM_RELEASE;
-    }
-#endif
-}
-
 static int open_self_maps(void *cpu_env, int fd)
 {
 #if defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_UNICORE32)
@@ -5225,6 +5154,11 @@ static int do_open(void *cpu_env, const char *pathname, int flags, mode_t mode)
         { NULL, NULL, NULL }
     };
 
+    if (is_proc_myself(pathname, "exe")) {
+        int execfd = qemu_getauxval(AT_EXECFD);
+        return execfd ? execfd : get_errno(open(exec_path, flags, mode));
+    }
+
     for (fake_open = fakes; fake_open->filename; fake_open++) {
         if (fake_open->cmp(pathname, fake_open->filename)) {
             break;
@@ -6309,7 +6243,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
             struct rusage rusage;
             ret = get_errno(getrusage(arg1, &rusage));
             if (!is_error(ret)) {
-                host_to_target_rusage(arg2, &rusage);
+                ret = host_to_target_rusage(arg2, &rusage);
             }
         }
         break;
@@ -6974,6 +6908,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
             abi_long status_ptr = arg2;
             struct rusage rusage, *rusage_ptr;
             abi_ulong target_rusage = arg4;
+            abi_long rusage_err;
             if (target_rusage)
                 rusage_ptr = &rusage;
             else
@@ -6985,8 +6920,12 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
                     if (put_user_s32(status, status_ptr))
                         goto efault;
                 }
-                if (target_rusage)
-                    host_to_target_rusage(target_rusage, &rusage);
+                if (target_rusage) {
+                    rusage_err = host_to_target_rusage(target_rusage, &rusage);
+                    if (rusage_err) {
+                        ret = rusage_err;
+                    }
+                }
             }
         }
         break;
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index fdf9a47595..69c3982ee6 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -2552,12 +2552,26 @@ struct target_timer_t {
     abi_ulong ptr;
 };
 
+#define TARGET_SIGEV_MAX_SIZE 64
+
+/* This is architecture-specific but most architectures use the default */
+#ifdef TARGET_MIPS
+#define TARGET_SIGEV_PREAMBLE_SIZE (sizeof(int32_t) * 2 + sizeof(abi_long))
+#else
+#define TARGET_SIGEV_PREAMBLE_SIZE (sizeof(int32_t) * 2 \
+                                    + sizeof(target_sigval_t))
+#endif
+
+#define TARGET_SIGEV_PAD_SIZE ((TARGET_SIGEV_MAX_SIZE \
+                                - TARGET_SIGEV_PREAMBLE_SIZE) \
+                               / sizeof(int32_t))
+
 struct target_sigevent {
     target_sigval_t sigev_value;
     int32_t sigev_signo;
     int32_t sigev_notify;
     union {
-        int32_t _pad[ARRAY_SIZE(((struct sigevent *)0)->_sigev_un._pad)];
+        int32_t _pad[TARGET_SIGEV_PAD_SIZE];
         int32_t _tid;
 
         struct {
diff --git a/linux-user/cpu-uname.c b/linux-user/uname.c
index 5db6e89567..f5d4c66f59 100644
--- a/linux-user/cpu-uname.c
+++ b/linux-user/uname.c
@@ -21,7 +21,7 @@
 
 #include "qemu.h"
 //#include "qemu-common.h"
-#include "cpu-uname.h"
+#include "uname.h"
 
 /* return highest utsname machine name for emulated instruction set
  *
@@ -70,3 +70,102 @@ const char *cpu_to_uname_machine(void *cpu_env)
     return UNAME_MACHINE;
 #endif
 }
+
+
+#define COPY_UTSNAME_FIELD(dest, src) \
+  do { \
+      /* __NEW_UTS_LEN doesn't include terminating null */ \
+      (void) strncpy((dest), (src), __NEW_UTS_LEN); \
+      (dest)[__NEW_UTS_LEN] = '\0'; \
+  } while (0)
+
+int sys_uname(struct new_utsname *buf)
+{
+  struct utsname uts_buf;
+
+  if (uname(&uts_buf) < 0)
+      return (-1);
+
+  /*
+   * Just in case these have some differences, we
+   * translate utsname to new_utsname (which is the
+   * struct linux kernel uses).
+   */
+
+  memset(buf, 0, sizeof(*buf));
+  COPY_UTSNAME_FIELD(buf->sysname, uts_buf.sysname);
+  COPY_UTSNAME_FIELD(buf->nodename, uts_buf.nodename);
+  COPY_UTSNAME_FIELD(buf->release, uts_buf.release);
+  COPY_UTSNAME_FIELD(buf->version, uts_buf.version);
+  COPY_UTSNAME_FIELD(buf->machine, uts_buf.machine);
+#ifdef _GNU_SOURCE
+  COPY_UTSNAME_FIELD(buf->domainname, uts_buf.domainname);
+#endif
+  return (0);
+
+#undef COPY_UTSNAME_FIELD
+}
+
+static int relstr_to_int(const char *s)
+{
+    /* Convert a uname release string like "2.6.18" to an integer
+     * of the form 0x020612. (Beware that 0x020612 is *not* 2.6.12.)
+     */
+    int i, n, tmp;
+
+    tmp = 0;
+    for (i = 0; i < 3; i++) {
+        n = 0;
+        while (*s >= '0' && *s <= '9') {
+            n *= 10;
+            n += *s - '0';
+            s++;
+        }
+        tmp = (tmp << 8) + n;
+        if (*s == '.') {
+            s++;
+        }
+    }
+    return tmp;
+}
+
+int get_osversion(void)
+{
+    static int osversion;
+    struct new_utsname buf;
+    const char *s;
+
+    if (osversion)
+        return osversion;
+    if (qemu_uname_release && *qemu_uname_release) {
+        s = qemu_uname_release;
+    } else {
+        if (sys_uname(&buf))
+            return 0;
+        s = buf.release;
+    }
+    osversion = relstr_to_int(s);
+    return osversion;
+}
+
+void init_qemu_uname_release(void)
+{
+    /* Initialize qemu_uname_release for later use.
+     * If the host kernel is too old and the user hasn't asked for
+     * a specific fake version number, we might want to fake a minimum
+     * target kernel version.
+     */
+    struct new_utsname buf;
+
+    if (qemu_uname_release && *qemu_uname_release) {
+        return;
+    }
+
+    if (sys_uname(&buf)) {
+        return;
+    }
+
+    if (relstr_to_int(buf.release) < relstr_to_int(UNAME_MINIMUM_RELEASE)) {
+        qemu_uname_release = UNAME_MINIMUM_RELEASE;
+    }
+}
diff --git a/linux-user/uname.h b/linux-user/uname.h
new file mode 100644
index 0000000000..cc62e76cc1
--- /dev/null
+++ b/linux-user/uname.h
@@ -0,0 +1,10 @@
+#ifndef UNAME_H
+#define UNAME_H 1
+
+#include <sys/utsname.h>
+#include <linux/utsname.h>
+
+const char *cpu_to_uname_machine(void *cpu_env);
+int sys_uname(struct new_utsname *buf);
+
+#endif /* UNAME _H */