Re: [Qemu-devel] [PATCH 02/17] s390x: s390x-linux-user support

[Riku Voipio <riku.voipio@iki.fi>]

Hi,

The patch looks OK, but I'd like to have a try with some s390x static
binaries. Such binaries are also useful for me to test that new patches
for linxu-user don't break targets I don't usually use.

Riku

On Fri, Apr 15, 2011 at 05:32:43PM +0200, Alexander Graf wrote:
> From: Ulrich Hecht <uli@suse.de>
> 
> This patch adds support for running s390x binaries in the linux-user emulation
> code.
> 
> Signed-off-by: Ulrich Hecht <uli@suse.de>
> Signed-off-by: Alexander Graf <agraf@suse.de>
> 
> ---
> 
> v1 -> v2:
> 
>   - always set 64bit flag for s390x binaries in elf loader
>   - remove redundant EXECUTE_SVC
>   - advance psw.addr in syscall execution path
> 
> v3 -> v4:
> 
>   - fix 32bit hosts
>   - fix coding style (except for header files shared with Linux)
> ---
>  linux-user/elfload.c             |   19 ++
>  linux-user/main.c                |   83 +++++++++
>  linux-user/s390x/syscall.h       |   23 +++
>  linux-user/s390x/syscall_nr.h    |  349 ++++++++++++++++++++++++++++++++++++++
>  linux-user/s390x/target_signal.h |   26 +++
>  linux-user/s390x/termbits.h      |  283 ++++++++++++++++++++++++++++++
>  linux-user/signal.c              |  333 ++++++++++++++++++++++++++++++++++++
>  linux-user/syscall.c             |   16 ++-
>  linux-user/syscall_defs.h        |   55 ++++++-
>  scripts/qemu-binfmt-conf.sh      |    4 +-
>  10 files changed, 1184 insertions(+), 7 deletions(-)
>  create mode 100644 linux-user/s390x/syscall.h
>  create mode 100644 linux-user/s390x/syscall_nr.h
>  create mode 100644 linux-user/s390x/target_signal.h
>  create mode 100644 linux-user/s390x/termbits.h
> 
> diff --git a/linux-user/elfload.c b/linux-user/elfload.c
> index 4c399f8..dcfeb7a 100644
> --- a/linux-user/elfload.c
> +++ b/linux-user/elfload.c
> @@ -867,6 +867,25 @@ static inline void init_thread(struct target_pt_regs *regs,
>  
>  #endif /* TARGET_ALPHA */
>  
> +#ifdef TARGET_S390X
> +
> +#define ELF_START_MMAP (0x20000000000ULL)
> +
> +#define elf_check_arch(x) ( (x) == ELF_ARCH )
> +
> +#define ELF_CLASS	ELFCLASS64
> +#define ELF_DATA	ELFDATA2MSB
> +#define ELF_ARCH	EM_S390
> +
> +static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
> +{
> +    regs->psw.addr = infop->entry;
> +    regs->psw.mask = PSW_MASK_64 | PSW_MASK_32;
> +    regs->gprs[15] = infop->start_stack;
> +}
> +
> +#endif /* TARGET_S390X */
> +
>  #ifndef ELF_PLATFORM
>  #define ELF_PLATFORM (NULL)
>  #endif
> diff --git a/linux-user/main.c b/linux-user/main.c
> index a1e37e4..82aaf9d 100644
> --- a/linux-user/main.c
> +++ b/linux-user/main.c
> @@ -2701,6 +2701,80 @@ void cpu_loop (CPUState *env)
>  }
>  #endif /* TARGET_ALPHA */
>  
> +#ifdef TARGET_S390X
> +void cpu_loop(CPUS390XState *env)
> +{
> +    int trapnr;
> +    target_siginfo_t info;
> +
> +    while (1) {
> +        trapnr = cpu_s390x_exec (env);
> +
> +        switch (trapnr) {
> +        case EXCP_INTERRUPT:
> +            /* just indicate that signals should be handled asap */
> +            break;
> +        case EXCP_DEBUG:
> +            {
> +                int sig;
> +
> +                sig = gdb_handlesig (env, TARGET_SIGTRAP);
> +                if (sig) {
> +                    info.si_signo = sig;
> +                    info.si_errno = 0;
> +                    info.si_code = TARGET_TRAP_BRKPT;
> +                    queue_signal(env, info.si_signo, &info);
> +                }
> +            }
> +            break;
> +        case EXCP_SVC:
> +            {
> +                int n = env->int_svc_code;
> +                if (!n) {
> +                    /* syscalls > 255 */
> +                    n = env->regs[1];
> +                }
> +                env->psw.addr += env->int_svc_ilc;
> +                env->regs[2] = do_syscall(env, n,
> +                           env->regs[2],
> +                           env->regs[3],
> +                           env->regs[4],
> +                           env->regs[5],
> +                           env->regs[6],
> +                           env->regs[7]);
> +            }
> +            break;
> +        case EXCP_ADDR:
> +            {
> +                info.si_signo = SIGSEGV;
> +                info.si_errno = 0;
> +                /* XXX: check env->error_code */
> +                info.si_code = TARGET_SEGV_MAPERR;
> +                info._sifields._sigfault._addr = env->__excp_addr;
> +                queue_signal(env, info.si_signo, &info);
> +            }
> +            break;
> +        case EXCP_SPEC:
> +            {
> +                fprintf(stderr,"specification exception insn 0x%08x%04x\n", ldl(env->psw.addr), lduw(env->psw.addr + 4));
> +                info.si_signo = SIGILL;
> +                info.si_errno = 0;
> +                info.si_code = TARGET_ILL_ILLOPC;
> +                info._sifields._sigfault._addr = env->__excp_addr;
> +                queue_signal(env, info.si_signo, &info);
> +            }
> +            break;
> +        default:
> +            printf ("Unhandled trap: 0x%x\n", trapnr);
> +            cpu_dump_state(env, stderr, fprintf, 0);
> +            exit (1);
> +        }
> +        process_pending_signals (env);
> +    }
> +}
> +
> +#endif /* TARGET_S390X */
> +
>  static void version(void)
>  {
>      printf("qemu-" TARGET_ARCH " version " QEMU_VERSION QEMU_PKGVERSION
> @@ -3450,6 +3524,15 @@ int main(int argc, char **argv, char **envp)
>  	    env->regs[15] = regs->acr;	    
>  	    env->pc = regs->erp;
>      }
> +#elif defined(TARGET_S390X)
> +    {
> +            int i;
> +            for (i = 0; i < 16; i++) {
> +                env->regs[i] = regs->gprs[i];
> +            }
> +            env->psw.mask = regs->psw.mask;
> +            env->psw.addr = regs->psw.addr;
> +    }
>  #else
>  #error unsupported target CPU
>  #endif
> diff --git a/linux-user/s390x/syscall.h b/linux-user/s390x/syscall.h
> new file mode 100644
> index 0000000..c2ea151
> --- /dev/null
> +++ b/linux-user/s390x/syscall.h
> @@ -0,0 +1,23 @@
> +/* this typedef defines how a Program Status Word looks like */
> +typedef struct {
> +    abi_ulong mask;
> +    abi_ulong addr;
> +} __attribute__ ((aligned(8))) target_psw_t;
> +
> +/*
> + * The pt_regs struct defines the way the registers are stored on
> + * the stack during a system call.
> + */
> +
> +#define TARGET_NUM_GPRS        16
> +
> +struct target_pt_regs {
> +    abi_ulong args[1];
> +    target_psw_t psw;
> +    abi_ulong gprs[TARGET_NUM_GPRS];
> +    abi_ulong orig_gpr2;
> +    unsigned short ilc;
> +    unsigned short trap;
> +};
> +
> +#define UNAME_MACHINE "s390x"
> diff --git a/linux-user/s390x/syscall_nr.h b/linux-user/s390x/syscall_nr.h
> new file mode 100644
> index 0000000..7cc6db2
> --- /dev/null
> +++ b/linux-user/s390x/syscall_nr.h
> @@ -0,0 +1,349 @@
> +/*
> + * This file contains the system call numbers.
> + */
> +
> +#define TARGET_NR_exit                 1
> +#define TARGET_NR_fork                 2
> +#define TARGET_NR_read                 3
> +#define TARGET_NR_write                4
> +#define TARGET_NR_open                 5
> +#define TARGET_NR_close                6
> +#define TARGET_NR_restart_syscall	  7
> +#define TARGET_NR_creat                8
> +#define TARGET_NR_link                 9
> +#define TARGET_NR_unlink              10
> +#define TARGET_NR_execve              11
> +#define TARGET_NR_chdir               12
> +#define TARGET_NR_mknod               14
> +#define TARGET_NR_chmod               15
> +#define TARGET_NR_lseek               19
> +#define TARGET_NR_getpid              20
> +#define TARGET_NR_mount               21
> +#define TARGET_NR_umount              22
> +#define TARGET_NR_ptrace              26
> +#define TARGET_NR_alarm               27
> +#define TARGET_NR_pause               29
> +#define TARGET_NR_utime               30
> +#define TARGET_NR_access              33
> +#define TARGET_NR_nice                34
> +#define TARGET_NR_sync                36
> +#define TARGET_NR_kill                37
> +#define TARGET_NR_rename              38
> +#define TARGET_NR_mkdir               39
> +#define TARGET_NR_rmdir               40
> +#define TARGET_NR_dup                 41
> +#define TARGET_NR_pipe                42
> +#define TARGET_NR_times               43
> +#define TARGET_NR_brk                 45
> +#define TARGET_NR_signal              48
> +#define TARGET_NR_acct                51
> +#define TARGET_NR_umount2             52
> +#define TARGET_NR_ioctl               54
> +#define TARGET_NR_fcntl               55
> +#define TARGET_NR_setpgid             57
> +#define TARGET_NR_umask               60
> +#define TARGET_NR_chroot              61
> +#define TARGET_NR_ustat               62
> +#define TARGET_NR_dup2                63
> +#define TARGET_NR_getppid             64
> +#define TARGET_NR_getpgrp             65
> +#define TARGET_NR_setsid              66
> +#define TARGET_NR_sigaction           67
> +#define TARGET_NR_sigsuspend          72
> +#define TARGET_NR_sigpending          73
> +#define TARGET_NR_sethostname         74
> +#define TARGET_NR_setrlimit           75
> +#define TARGET_NR_getrusage           77
> +#define TARGET_NR_gettimeofday        78
> +#define TARGET_NR_settimeofday        79
> +#define TARGET_NR_symlink             83
> +#define TARGET_NR_readlink            85
> +#define TARGET_NR_uselib              86
> +#define TARGET_NR_swapon              87
> +#define TARGET_NR_reboot              88
> +#define TARGET_NR_readdir             89
> +#define TARGET_NR_mmap                90
> +#define TARGET_NR_munmap              91
> +#define TARGET_NR_truncate            92
> +#define TARGET_NR_ftruncate           93
> +#define TARGET_NR_fchmod              94
> +#define TARGET_NR_getpriority         96
> +#define TARGET_NR_setpriority         97
> +#define TARGET_NR_statfs              99
> +#define TARGET_NR_fstatfs            100
> +#define TARGET_NR_socketcall         102
> +#define TARGET_NR_syslog             103
> +#define TARGET_NR_setitimer          104
> +#define TARGET_NR_getitimer          105
> +#define TARGET_NR_stat               106
> +#define TARGET_NR_lstat              107
> +#define TARGET_NR_fstat              108
> +#define TARGET_NR_lookup_dcookie     110
> +#define TARGET_NR_vhangup            111
> +#define TARGET_NR_idle               112
> +#define TARGET_NR_wait4              114
> +#define TARGET_NR_swapoff            115
> +#define TARGET_NR_sysinfo            116
> +#define TARGET_NR_ipc                117
> +#define TARGET_NR_fsync              118
> +#define TARGET_NR_sigreturn          119
> +#define TARGET_NR_clone              120
> +#define TARGET_NR_setdomainname      121
> +#define TARGET_NR_uname              122
> +#define TARGET_NR_adjtimex           124
> +#define TARGET_NR_mprotect           125
> +#define TARGET_NR_sigprocmask        126
> +#define TARGET_NR_create_module      127
> +#define TARGET_NR_init_module        128
> +#define TARGET_NR_delete_module      129
> +#define TARGET_NR_get_kernel_syms    130
> +#define TARGET_NR_quotactl           131
> +#define TARGET_NR_getpgid            132
> +#define TARGET_NR_fchdir             133
> +#define TARGET_NR_bdflush            134
> +#define TARGET_NR_sysfs              135
> +#define TARGET_NR_personality        136
> +#define TARGET_NR_afs_syscall        137 /* Syscall for Andrew File System */
> +#define TARGET_NR_getdents           141
> +#define TARGET_NR_flock              143
> +#define TARGET_NR_msync              144
> +#define TARGET_NR_readv              145
> +#define TARGET_NR_writev             146
> +#define TARGET_NR_getsid             147
> +#define TARGET_NR_fdatasync          148
> +#define TARGET_NR__sysctl            149
> +#define TARGET_NR_mlock              150
> +#define TARGET_NR_munlock            151
> +#define TARGET_NR_mlockall           152
> +#define TARGET_NR_munlockall         153
> +#define TARGET_NR_sched_setparam             154
> +#define TARGET_NR_sched_getparam             155
> +#define TARGET_NR_sched_setscheduler         156
> +#define TARGET_NR_sched_getscheduler         157
> +#define TARGET_NR_sched_yield                158
> +#define TARGET_NR_sched_get_priority_max     159
> +#define TARGET_NR_sched_get_priority_min     160
> +#define TARGET_NR_sched_rr_get_interval      161
> +#define TARGET_NR_nanosleep          162
> +#define TARGET_NR_mremap             163
> +#define TARGET_NR_query_module       167
> +#define TARGET_NR_poll               168
> +#define TARGET_NR_nfsservctl         169
> +#define TARGET_NR_prctl              172
> +#define TARGET_NR_rt_sigreturn       173
> +#define TARGET_NR_rt_sigaction       174
> +#define TARGET_NR_rt_sigprocmask     175
> +#define TARGET_NR_rt_sigpending      176
> +#define TARGET_NR_rt_sigtimedwait    177
> +#define TARGET_NR_rt_sigqueueinfo    178
> +#define TARGET_NR_rt_sigsuspend      179
> +#define TARGET_NR_pread64            180
> +#define TARGET_NR_pwrite64           181
> +#define TARGET_NR_getcwd             183
> +#define TARGET_NR_capget             184
> +#define TARGET_NR_capset             185
> +#define TARGET_NR_sigaltstack        186
> +#define TARGET_NR_sendfile           187
> +#define TARGET_NR_getpmsg		188
> +#define TARGET_NR_putpmsg		189
> +#define TARGET_NR_vfork		190
> +#define TARGET_NR_pivot_root         217
> +#define TARGET_NR_mincore            218
> +#define TARGET_NR_madvise            219
> +#define TARGET_NR_getdents64		220
> +#define TARGET_NR_readahead		222
> +#define TARGET_NR_setxattr		224
> +#define TARGET_NR_lsetxattr		225
> +#define TARGET_NR_fsetxattr		226
> +#define TARGET_NR_getxattr		227
> +#define TARGET_NR_lgetxattr		228
> +#define TARGET_NR_fgetxattr		229
> +#define TARGET_NR_listxattr		230
> +#define TARGET_NR_llistxattr		231
> +#define TARGET_NR_flistxattr		232
> +#define TARGET_NR_removexattr	233
> +#define TARGET_NR_lremovexattr	234
> +#define TARGET_NR_fremovexattr	235
> +#define TARGET_NR_gettid		236
> +#define TARGET_NR_tkill		237
> +#define TARGET_NR_futex		238
> +#define TARGET_NR_sched_setaffinity	239
> +#define TARGET_NR_sched_getaffinity	240
> +#define TARGET_NR_tgkill		241
> +/* Number 242 is reserved for tux */
> +#define TARGET_NR_io_setup		243
> +#define TARGET_NR_io_destroy		244
> +#define TARGET_NR_io_getevents	245
> +#define TARGET_NR_io_submit		246
> +#define TARGET_NR_io_cancel		247
> +#define TARGET_NR_exit_group		248
> +#define TARGET_NR_epoll_create	249
> +#define TARGET_NR_epoll_ctl		250
> +#define TARGET_NR_epoll_wait		251
> +#define TARGET_NR_set_tid_address	252
> +#define TARGET_NR_fadvise64		253
> +#define TARGET_NR_timer_create	254
> +#define TARGET_NR_timer_settime	(TARGET_NR_timer_create+1)
> +#define TARGET_NR_timer_gettime	(TARGET_NR_timer_create+2)
> +#define TARGET_NR_timer_getoverrun	(TARGET_NR_timer_create+3)
> +#define TARGET_NR_timer_delete	(TARGET_NR_timer_create+4)
> +#define TARGET_NR_clock_settime	(TARGET_NR_timer_create+5)
> +#define TARGET_NR_clock_gettime	(TARGET_NR_timer_create+6)
> +#define TARGET_NR_clock_getres	(TARGET_NR_timer_create+7)
> +#define TARGET_NR_clock_nanosleep	(TARGET_NR_timer_create+8)
> +/* Number 263 is reserved for vserver */
> +#define TARGET_NR_statfs64		265
> +#define TARGET_NR_fstatfs64		266
> +#define TARGET_NR_remap_file_pages	267
> +/* Number 268 is reserved for new sys_mbind */
> +/* Number 269 is reserved for new sys_get_mempolicy */
> +/* Number 270 is reserved for new sys_set_mempolicy */
> +#define TARGET_NR_mq_open		271
> +#define TARGET_NR_mq_unlink		272
> +#define TARGET_NR_mq_timedsend	273
> +#define TARGET_NR_mq_timedreceive	274
> +#define TARGET_NR_mq_notify		275
> +#define TARGET_NR_mq_getsetattr	276
> +#define TARGET_NR_kexec_load		277
> +#define TARGET_NR_add_key		278
> +#define TARGET_NR_request_key	279
> +#define TARGET_NR_keyctl		280
> +#define TARGET_NR_waitid		281
> +#define TARGET_NR_ioprio_set		282
> +#define TARGET_NR_ioprio_get		283
> +#define TARGET_NR_inotify_init	284
> +#define TARGET_NR_inotify_add_watch	285
> +#define TARGET_NR_inotify_rm_watch	286
> +/* Number 287 is reserved for new sys_migrate_pages */
> +#define TARGET_NR_openat		288
> +#define TARGET_NR_mkdirat		289
> +#define TARGET_NR_mknodat		290
> +#define TARGET_NR_fchownat		291
> +#define TARGET_NR_futimesat		292
> +#define TARGET_NR_unlinkat		294
> +#define TARGET_NR_renameat		295
> +#define TARGET_NR_linkat		296
> +#define TARGET_NR_symlinkat		297
> +#define TARGET_NR_readlinkat		298
> +#define TARGET_NR_fchmodat		299
> +#define TARGET_NR_faccessat		300
> +#define TARGET_NR_pselect6		301
> +#define TARGET_NR_ppoll		302
> +#define TARGET_NR_unshare		303
> +#define TARGET_NR_set_robust_list	304
> +#define TARGET_NR_get_robust_list	305
> +#define TARGET_NR_splice		306
> +#define TARGET_NR_sync_file_range	307
> +#define TARGET_NR_tee		308
> +#define TARGET_NR_vmsplice		309
> +/* Number 310 is reserved for new sys_move_pages */
> +#define TARGET_NR_getcpu		311
> +#define TARGET_NR_epoll_pwait	312
> +#define TARGET_NR_utimes		313
> +#define TARGET_NR_fallocate		314
> +#define TARGET_NR_utimensat		315
> +#define TARGET_NR_signalfd		316
> +#define TARGET_NR_timerfd		317
> +#define TARGET_NR_eventfd		318
> +#define TARGET_NR_timerfd_create	319
> +#define TARGET_NR_timerfd_settime	320
> +#define TARGET_NR_timerfd_gettime	321
> +#define TARGET_NR_signalfd4		322
> +#define TARGET_NR_eventfd2		323
> +#define TARGET_NR_inotify_init1	324
> +#define TARGET_NR_pipe2		325
> +#define TARGET_NR_dup3		326
> +#define TARGET_NR_epoll_create1	327
> +#undef NR_syscalls
> +#define NR_syscalls 328
> +
> +/*
> + * There are some system calls that are not present on 64 bit, some
> + * have a different name although they do the same (e.g. TARGET_NR_chown32
> + * is TARGET_NR_chown on 64 bit).
> + */
> +#ifndef TARGET_S390X
> +
> +#define TARGET_NR_time		 13
> +#define TARGET_NR_lchown		 16
> +#define TARGET_NR_setuid		 23
> +#define TARGET_NR_getuid		 24
> +#define TARGET_NR_stime		 25
> +#define TARGET_NR_setgid		 46
> +#define TARGET_NR_getgid		 47
> +#define TARGET_NR_geteuid		 49
> +#define TARGET_NR_getegid		 50
> +#define TARGET_NR_setreuid		 70
> +#define TARGET_NR_setregid		 71
> +#define TARGET_NR_getrlimit		 76
> +#define TARGET_NR_getgroups		 80
> +#define TARGET_NR_setgroups		 81
> +#define TARGET_NR_fchown		 95
> +#define TARGET_NR_ioperm		101
> +#define TARGET_NR_setfsuid		138
> +#define TARGET_NR_setfsgid		139
> +#define TARGET_NR__llseek		140
> +#define TARGET_NR__newselect 	142
> +#define TARGET_NR_setresuid		164
> +#define TARGET_NR_getresuid		165
> +#define TARGET_NR_setresgid		170
> +#define TARGET_NR_getresgid		171
> +#define TARGET_NR_chown		182
> +#define TARGET_NR_ugetrlimit		191	/* SuS compliant getrlimit */
> +#define TARGET_NR_mmap2		192
> +#define TARGET_NR_truncate64		193
> +#define TARGET_NR_ftruncate64	194
> +#define TARGET_NR_stat64		195
> +#define TARGET_NR_lstat64		196
> +#define TARGET_NR_fstat64		197
> +#define TARGET_NR_lchown32		198
> +#define TARGET_NR_getuid32		199
> +#define TARGET_NR_getgid32		200
> +#define TARGET_NR_geteuid32		201
> +#define TARGET_NR_getegid32		202
> +#define TARGET_NR_setreuid32		203
> +#define TARGET_NR_setregid32		204
> +#define TARGET_NR_getgroups32	205
> +#define TARGET_NR_setgroups32	206
> +#define TARGET_NR_fchown32		207
> +#define TARGET_NR_setresuid32	208
> +#define TARGET_NR_getresuid32	209
> +#define TARGET_NR_setresgid32	210
> +#define TARGET_NR_getresgid32	211
> +#define TARGET_NR_chown32		212
> +#define TARGET_NR_setuid32		213
> +#define TARGET_NR_setgid32		214
> +#define TARGET_NR_setfsuid32		215
> +#define TARGET_NR_setfsgid32		216
> +#define TARGET_NR_fcntl64		221
> +#define TARGET_NR_sendfile64		223
> +#define TARGET_NR_fadvise64_64	264
> +#define TARGET_NR_fstatat64		293
> +
> +#else
> +
> +#define TARGET_NR_select		142
> +#define TARGET_NR_getrlimit		191	/* SuS compliant getrlimit */
> +#define TARGET_NR_lchown  		198
> +#define TARGET_NR_getuid  		199
> +#define TARGET_NR_getgid  		200
> +#define TARGET_NR_geteuid  		201
> +#define TARGET_NR_getegid  		202
> +#define TARGET_NR_setreuid  		203
> +#define TARGET_NR_setregid  		204
> +#define TARGET_NR_getgroups  	205
> +#define TARGET_NR_setgroups  	206
> +#define TARGET_NR_fchown  		207
> +#define TARGET_NR_setresuid  	208
> +#define TARGET_NR_getresuid  	209
> +#define TARGET_NR_setresgid  	210
> +#define TARGET_NR_getresgid  	211
> +#define TARGET_NR_chown  		212
> +#define TARGET_NR_setuid  		213
> +#define TARGET_NR_setgid  		214
> +#define TARGET_NR_setfsuid  		215
> +#define TARGET_NR_setfsgid  		216
> +#define TARGET_NR_newfstatat		293
> +
> +#endif
> +
> diff --git a/linux-user/s390x/target_signal.h b/linux-user/s390x/target_signal.h
> new file mode 100644
> index 0000000..b4816b0
> --- /dev/null
> +++ b/linux-user/s390x/target_signal.h
> @@ -0,0 +1,26 @@
> +#ifndef TARGET_SIGNAL_H
> +#define TARGET_SIGNAL_H
> +
> +#include "cpu.h"
> +
> +typedef struct target_sigaltstack {
> +    abi_ulong ss_sp;
> +    int ss_flags;
> +    abi_ulong ss_size;
> +} target_stack_t;
> +
> +/*
> + * sigaltstack controls
> + */
> +#define TARGET_SS_ONSTACK      1
> +#define TARGET_SS_DISABLE      2
> +
> +#define TARGET_MINSIGSTKSZ     2048
> +#define TARGET_SIGSTKSZ        8192
> +
> +static inline abi_ulong get_sp_from_cpustate(CPUS390XState *state)
> +{
> +   return state->regs[15];
> +}
> +
> +#endif /* TARGET_SIGNAL_H */
> diff --git a/linux-user/s390x/termbits.h b/linux-user/s390x/termbits.h
> new file mode 100644
> index 0000000..2a78a05
> --- /dev/null
> +++ b/linux-user/s390x/termbits.h
> @@ -0,0 +1,283 @@
> +/*
> + *  include/asm-s390/termbits.h
> + *
> + *  S390 version
> + *
> + *  Derived from "include/asm-i386/termbits.h"
> + */
> +
> +#define TARGET_NCCS 19
> +struct target_termios {
> +    unsigned int c_iflag;		/* input mode flags */
> +    unsigned int c_oflag;		/* output mode flags */
> +    unsigned int c_cflag;		/* control mode flags */
> +    unsigned int c_lflag;		/* local mode flags */
> +    unsigned char c_line;			/* line discipline */
> +    unsigned char c_cc[TARGET_NCCS];		/* control characters */
> +};
> +
> +struct target_termios2 {
> +    unsigned int c_iflag;		/* input mode flags */
> +    unsigned int c_oflag;		/* output mode flags */
> +    unsigned int c_cflag;		/* control mode flags */
> +    unsigned int c_lflag;		/* local mode flags */
> +    unsigned char c_line;			/* line discipline */
> +    unsigned char c_cc[TARGET_NCCS];		/* control characters */
> +    unsigned int c_ispeed;		/* input speed */
> +    unsigned int c_ospeed;		/* output speed */
> +};
> +
> +struct target_ktermios {
> +    unsigned int c_iflag;		/* input mode flags */
> +    unsigned int c_oflag;		/* output mode flags */
> +    unsigned int c_cflag;		/* control mode flags */
> +    unsigned int c_lflag;		/* local mode flags */
> +    unsigned char c_line;			/* line discipline */
> +    unsigned char c_cc[TARGET_NCCS];		/* control characters */
> +    unsigned int c_ispeed;		/* input speed */
> +    unsigned int c_ospeed;		/* output speed */
> +};
> +
> +/* c_cc characters */
> +#define TARGET_VINTR 0
> +#define TARGET_VQUIT 1
> +#define TARGET_VERASE 2
> +#define TARGET_VKILL 3
> +#define TARGET_VEOF 4
> +#define TARGET_VTIME 5
> +#define TARGET_VMIN 6
> +#define TARGET_VSWTC 7
> +#define TARGET_VSTART 8
> +#define TARGET_VSTOP 9
> +#define TARGET_VSUSP 10
> +#define TARGET_VEOL 11
> +#define TARGET_VREPRINT 12
> +#define TARGET_VDISCARD 13
> +#define TARGET_VWERASE 14
> +#define TARGET_VLNEXT 15
> +#define TARGET_VEOL2 16
> +
> +/* c_iflag bits */
> +#define TARGET_IGNBRK	0000001
> +#define TARGET_BRKINT	0000002
> +#define TARGET_IGNPAR	0000004
> +#define TARGET_PARMRK	0000010
> +#define TARGET_INPCK	0000020
> +#define TARGET_ISTRIP	0000040
> +#define TARGET_INLCR	0000100
> +#define TARGET_IGNCR	0000200
> +#define TARGET_ICRNL	0000400
> +#define TARGET_IUCLC	0001000
> +#define TARGET_IXON	0002000
> +#define TARGET_IXANY	0004000
> +#define TARGET_IXOFF	0010000
> +#define TARGET_IMAXBEL	0020000
> +#define TARGET_IUTF8	0040000
> +
> +/* c_oflag bits */
> +#define TARGET_OPOST	0000001
> +#define TARGET_OLCUC	0000002
> +#define TARGET_ONLCR	0000004
> +#define TARGET_OCRNL	0000010
> +#define TARGET_ONOCR	0000020
> +#define TARGET_ONLRET	0000040
> +#define TARGET_OFILL	0000100
> +#define TARGET_OFDEL	0000200
> +#define TARGET_NLDLY	0000400
> +#define TARGET_NL0	0000000
> +#define TARGET_NL1	0000400
> +#define TARGET_CRDLY	0003000
> +#define TARGET_CR0	0000000
> +#define TARGET_CR1	0001000
> +#define TARGET_CR2	0002000
> +#define TARGET_CR3	0003000
> +#define TARGET_TABDLY	0014000
> +#define TARGET_TAB0	0000000
> +#define TARGET_TAB1	0004000
> +#define TARGET_TAB2	0010000
> +#define TARGET_TAB3	0014000
> +#define TARGET_XTABS	0014000
> +#define TARGET_BSDLY	0020000
> +#define TARGET_BS0	0000000
> +#define TARGET_BS1	0020000
> +#define TARGET_VTDLY	0040000
> +#define TARGET_VT0	0000000
> +#define TARGET_VT1	0040000
> +#define TARGET_FFDLY	0100000
> +#define TARGET_FF0	0000000
> +#define TARGET_FF1	0100000
> +
> +/* c_cflag bit meaning */
> +#define TARGET_CBAUD	0010017
> +#define TARGET_B0	0000000		/* hang up */
> +#define TARGET_B50	0000001
> +#define TARGET_B75	0000002
> +#define TARGET_B110	0000003
> +#define TARGET_B134	0000004
> +#define TARGET_B150	0000005
> +#define TARGET_B200	0000006
> +#define TARGET_B300	0000007
> +#define TARGET_B600	0000010
> +#define TARGET_B1200	0000011
> +#define TARGET_B1800	0000012
> +#define TARGET_B2400	0000013
> +#define TARGET_B4800	0000014
> +#define TARGET_B9600	0000015
> +#define TARGET_B19200	0000016
> +#define TARGET_B38400	0000017
> +#define TARGET_EXTA B19200
> +#define TARGET_EXTB B38400
> +#define TARGET_CSIZE	0000060
> +#define TARGET_CS5	0000000
> +#define TARGET_CS6	0000020
> +#define TARGET_CS7	0000040
> +#define TARGET_CS8	0000060
> +#define TARGET_CSTOPB	0000100
> +#define TARGET_CREAD	0000200
> +#define TARGET_PARENB	0000400
> +#define TARGET_PARODD	0001000
> +#define TARGET_HUPCL	0002000
> +#define TARGET_CLOCAL	0004000
> +#define TARGET_CBAUDEX 0010000
> +#define TARGET_BOTHER  0010000
> +#define TARGET_B57600  0010001
> +#define TARGET_B115200 0010002
> +#define TARGET_B230400 0010003
> +#define TARGET_B460800 0010004
> +#define TARGET_B500000 0010005
> +#define TARGET_B576000 0010006
> +#define TARGET_B921600 0010007
> +#define TARGET_B1000000 0010010
> +#define TARGET_B1152000 0010011
> +#define TARGET_B1500000 0010012
> +#define TARGET_B2000000 0010013
> +#define TARGET_B2500000 0010014
> +#define TARGET_B3000000 0010015
> +#define TARGET_B3500000 0010016
> +#define TARGET_B4000000 0010017
> +#define TARGET_CIBAUD	  002003600000	/* input baud rate */
> +#define TARGET_CMSPAR	  010000000000		/* mark or space (stick) parity */
> +#define TARGET_CRTSCTS	  020000000000		/* flow control */
> +
> +#define TARGET_IBSHIFT	  16		/* Shift from CBAUD to CIBAUD */
> +
> +/* c_lflag bits */
> +#define TARGET_ISIG	0000001
> +#define TARGET_ICANON	0000002
> +#define TARGET_XCASE	0000004
> +#define TARGET_ECHO	0000010
> +#define TARGET_ECHOE	0000020
> +#define TARGET_ECHOK	0000040
> +#define TARGET_ECHONL	0000100
> +#define TARGET_NOFLSH	0000200
> +#define TARGET_TOSTOP	0000400
> +#define TARGET_ECHOCTL	0001000
> +#define TARGET_ECHOPRT	0002000
> +#define TARGET_ECHOKE	0004000
> +#define TARGET_FLUSHO	0010000
> +#define TARGET_PENDIN	0040000
> +#define TARGET_IEXTEN	0100000
> +
> +/* tcflow() and TCXONC use these */
> +#define	TARGET_TCOOFF		0
> +#define	TARGET_TCOON		1
> +#define	TARGET_TCIOFF		2
> +#define	TARGET_TCION		3
> +
> +/* tcflush() and TCFLSH use these */
> +#define	TARGET_TCIFLUSH	0
> +#define	TARGET_TCOFLUSH	1
> +#define	TARGET_TCIOFLUSH	2
> +
> +/* tcsetattr uses these */
> +#define	TARGET_TCSANOW		0
> +#define	TARGET_TCSADRAIN	1
> +#define	TARGET_TCSAFLUSH	2
> +
> +/*
> + *  include/asm-s390/ioctls.h
> + *
> + *  S390 version
> + *
> + *  Derived from "include/asm-i386/ioctls.h"
> + */
> +
> +/* 0x54 is just a magic number to make these relatively unique ('T') */
> +
> +#define TARGET_TCGETS		0x5401
> +#define TARGET_TCSETS		0x5402
> +#define TARGET_TCSETSW		0x5403
> +#define TARGET_TCSETSF		0x5404
> +#define TARGET_TCGETA		0x5405
> +#define TARGET_TCSETA		0x5406
> +#define TARGET_TCSETAW		0x5407
> +#define TARGET_TCSETAF		0x5408
> +#define TARGET_TCSBRK		0x5409
> +#define TARGET_TCXONC		0x540A
> +#define TARGET_TCFLSH		0x540B
> +#define TARGET_TIOCEXCL	0x540C
> +#define TARGET_TIOCNXCL	0x540D
> +#define TARGET_TIOCSCTTY	0x540E
> +#define TARGET_TIOCGPGRP	0x540F
> +#define TARGET_TIOCSPGRP	0x5410
> +#define TARGET_TIOCOUTQ	0x5411
> +#define TARGET_TIOCSTI		0x5412
> +#define TARGET_TIOCGWINSZ	0x5413
> +#define TARGET_TIOCSWINSZ	0x5414
> +#define TARGET_TIOCMGET	0x5415
> +#define TARGET_TIOCMBIS	0x5416
> +#define TARGET_TIOCMBIC	0x5417
> +#define TARGET_TIOCMSET	0x5418
> +#define TARGET_TIOCGSOFTCAR	0x5419
> +#define TARGET_TIOCSSOFTCAR	0x541A
> +#define TARGET_FIONREAD	0x541B
> +#define TARGET_TIOCINQ		FIONREAD
> +#define TARGET_TIOCLINUX	0x541C
> +#define TARGET_TIOCCONS	0x541D
> +#define TARGET_TIOCGSERIAL	0x541E
> +#define TARGET_TIOCSSERIAL	0x541F
> +#define TARGET_TIOCPKT		0x5420
> +#define TARGET_FIONBIO		0x5421
> +#define TARGET_TIOCNOTTY	0x5422
> +#define TARGET_TIOCSETD	0x5423
> +#define TARGET_TIOCGETD	0x5424
> +#define TARGET_TCSBRKP		0x5425	/* Needed for POSIX tcsendbreak() */
> +#define TARGET_TIOCSBRK	0x5427  /* BSD compatibility */
> +#define TARGET_TIOCCBRK	0x5428  /* BSD compatibility */
> +#define TARGET_TIOCGSID	0x5429  /* Return the session ID of FD */
> +#define TARGET_TCGETS2		_IOR('T',0x2A, struct termios2)
> +#define TARGET_TCSETS2		_IOW('T',0x2B, struct termios2)
> +#define TARGET_TCSETSW2	_IOW('T',0x2C, struct termios2)
> +#define TARGET_TCSETSF2	_IOW('T',0x2D, struct termios2)
> +#define TARGET_TIOCGPTN	_IOR('T',0x30, unsigned int) /* Get Pty Number (of pty-mux device) */
> +#define TARGET_TIOCSPTLCK	_IOW('T',0x31, int)  /* Lock/unlock Pty */
> +#define TARGET_TIOCGDEV	_IOR('T',0x32, unsigned int) /* Get real dev no below /dev/console */
> +
> +#define TARGET_FIONCLEX	0x5450  /* these numbers need to be adjusted. */
> +#define TARGET_FIOCLEX		0x5451
> +#define TARGET_FIOASYNC	0x5452
> +#define TARGET_TIOCSERCONFIG	0x5453
> +#define TARGET_TIOCSERGWILD	0x5454
> +#define TARGET_TIOCSERSWILD	0x5455
> +#define TARGET_TIOCGLCKTRMIOS	0x5456
> +#define TARGET_TIOCSLCKTRMIOS	0x5457
> +#define TARGET_TIOCSERGSTRUCT	0x5458 /* For debugging only */
> +#define TARGET_TIOCSERGETLSR   0x5459 /* Get line status register */
> +#define TARGET_TIOCSERGETMULTI 0x545A /* Get multiport config  */
> +#define TARGET_TIOCSERSETMULTI 0x545B /* Set multiport config */
> +
> +#define TARGET_TIOCMIWAIT	0x545C	/* wait for a change on serial input line(s) */
> +#define TARGET_TIOCGICOUNT	0x545D	/* read serial port inline interrupt counts */
> +#define TARGET_FIOQSIZE	0x545E
> +
> +/* Used for packet mode */
> +#define TARGET_TIOCPKT_DATA		 0
> +#define TARGET_TIOCPKT_FLUSHREAD	 1
> +#define TARGET_TIOCPKT_FLUSHWRITE	 2
> +#define TARGET_TIOCPKT_STOP		 4
> +#define TARGET_TIOCPKT_START		 8
> +#define TARGET_TIOCPKT_NOSTOP		16
> +#define TARGET_TIOCPKT_DOSTOP		32
> +
> +#define TARGET_TIOCSER_TEMT    0x01	/* Transmitter physically empty */
> +
> diff --git a/linux-user/signal.c b/linux-user/signal.c
> index ce033e9..42cc62c 100644
> --- a/linux-user/signal.c
> +++ b/linux-user/signal.c
> @@ -3614,6 +3614,339 @@ long do_rt_sigreturn(CPUState *env)
>      return -TARGET_ENOSYS;
>  }
>  
> +#elif defined(TARGET_S390X)
> +
> +#define __NUM_GPRS 16
> +#define __NUM_FPRS 16
> +#define __NUM_ACRS 16
> +
> +#define S390_SYSCALL_SIZE   2
> +#define __SIGNAL_FRAMESIZE      160 /* FIXME: 31-bit mode -> 96 */
> +
> +#define _SIGCONTEXT_NSIG        64
> +#define _SIGCONTEXT_NSIG_BPW    64 /* FIXME: 31-bit mode -> 32 */
> +#define _SIGCONTEXT_NSIG_WORDS  (_SIGCONTEXT_NSIG / _SIGCONTEXT_NSIG_BPW)
> +#define _SIGMASK_COPY_SIZE    (sizeof(unsigned long)*_SIGCONTEXT_NSIG_WORDS)
> +#define PSW_ADDR_AMODE            0x0000000000000000UL /* 0x80000000UL for 31-bit */
> +#define S390_SYSCALL_OPCODE ((uint16_t)0x0a00)
> +
> +typedef struct {
> +    target_psw_t psw;
> +    target_ulong gprs[__NUM_GPRS];
> +    unsigned int acrs[__NUM_ACRS];
> +} target_s390_regs_common;
> +
> +typedef struct {
> +    unsigned int fpc;
> +    double   fprs[__NUM_FPRS];
> +} target_s390_fp_regs;
> +
> +typedef struct {
> +    target_s390_regs_common regs;
> +    target_s390_fp_regs     fpregs;
> +} target_sigregs;
> +
> +struct target_sigcontext {
> +    target_ulong   oldmask[_SIGCONTEXT_NSIG_WORDS];
> +    target_sigregs *sregs;
> +};
> +
> +typedef struct {
> +    uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
> +    struct target_sigcontext sc;
> +    target_sigregs sregs;
> +    int signo;
> +    uint8_t retcode[S390_SYSCALL_SIZE];
> +} sigframe;
> +
> +struct target_ucontext {
> +    target_ulong uc_flags;
> +    struct target_ucontext *uc_link;
> +    target_stack_t uc_stack;
> +    target_sigregs uc_mcontext;
> +    target_sigset_t uc_sigmask;   /* mask last for extensibility */
> +};
> +
> +typedef struct {
> +    uint8_t callee_used_stack[__SIGNAL_FRAMESIZE];
> +    uint8_t retcode[S390_SYSCALL_SIZE];
> +    struct target_siginfo info;
> +    struct target_ucontext uc;
> +} rt_sigframe;
> +
> +static inline abi_ulong
> +get_sigframe(struct target_sigaction *ka, CPUState *env, size_t frame_size)
> +{
> +    abi_ulong sp;
> +
> +    /* Default to using normal stack */
> +    sp = env->regs[15];
> +
> +    /* This is the X/Open sanctioned signal stack switching.  */
> +    if (ka->sa_flags & TARGET_SA_ONSTACK) {
> +        if (!sas_ss_flags(sp)) {
> +            sp = target_sigaltstack_used.ss_sp +
> +                 target_sigaltstack_used.ss_size;
> +        }
> +    }
> +
> +    /* This is the legacy signal stack switching. */
> +    else if (/* FIXME !user_mode(regs) */ 0 &&
> +             !(ka->sa_flags & TARGET_SA_RESTORER) &&
> +             ka->sa_restorer) {
> +        sp = (abi_ulong) ka->sa_restorer;
> +    }
> +
> +    return (sp - frame_size) & -8ul;
> +}
> +
> +static void save_sigregs(CPUState *env, target_sigregs *sregs)
> +{
> +    int i;
> +    //save_access_regs(current->thread.acrs); FIXME
> +
> +    /* Copy a 'clean' PSW mask to the user to avoid leaking
> +       information about whether PER is currently on.  */
> +    __put_user(env->psw.mask, &sregs->regs.psw.mask);
> +    __put_user(env->psw.addr, &sregs->regs.psw.addr);
> +    for (i = 0; i < 16; i++) {
> +        __put_user(env->regs[i], &sregs->regs.gprs[i]);
> +    }
> +    for (i = 0; i < 16; i++) {
> +        __put_user(env->aregs[i], &sregs->regs.acrs[i]);
> +    }
> +    /*
> +     * We have to store the fp registers to current->thread.fp_regs
> +     * to merge them with the emulated registers.
> +     */
> +    //save_fp_regs(&current->thread.fp_regs); FIXME
> +    for (i = 0; i < 16; i++) {
> +        __put_user(env->fregs[i].ll, &sregs->fpregs.fprs[i]);
> +    }
> +}
> +
> +static void setup_frame(int sig, struct target_sigaction *ka,
> +			target_sigset_t *set, CPUState *env)
> +{
> +    sigframe *frame;
> +    abi_ulong frame_addr;
> +
> +    frame_addr = get_sigframe(ka, env, sizeof(*frame));
> +    qemu_log("%s: frame_addr 0x%llx\n", __FUNCTION__,
> +             (unsigned long long)frame_addr);
> +    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
> +            goto give_sigsegv;
> +    }
> +
> +    qemu_log("%s: 1\n", __FUNCTION__);
> +    if (__put_user(set->sig[0], &frame->sc.oldmask[0])) {
> +              goto give_sigsegv;
> +    }
> +
> +    save_sigregs(env, &frame->sregs);
> +
> +    __put_user((abi_ulong)(unsigned long)&frame->sregs,
> +               (abi_ulong *)&frame->sc.sregs);
> +
> +    /* Set up to return from userspace.  If provided, use a stub
> +       already in userspace.  */
> +    if (ka->sa_flags & TARGET_SA_RESTORER) {
> +            env->regs[14] = (unsigned long)
> +                    ka->sa_restorer | PSW_ADDR_AMODE;
> +    } else {
> +            env->regs[14] = (unsigned long)
> +                    frame->retcode | PSW_ADDR_AMODE;
> +            if (__put_user(S390_SYSCALL_OPCODE | TARGET_NR_sigreturn,
> +                           (uint16_t *)(frame->retcode)))
> +                    goto give_sigsegv;
> +    }
> +
> +    /* Set up backchain. */
> +    if (__put_user(env->regs[15], (abi_ulong *) frame)) {
> +            goto give_sigsegv;
> +    }
> +
> +    /* Set up registers for signal handler */
> +    env->regs[15] = (target_ulong)(unsigned long) frame;
> +    env->psw.addr = (target_ulong) ka->_sa_handler | PSW_ADDR_AMODE;
> +
> +    env->regs[2] = sig; //map_signal(sig);
> +    env->regs[3] = (target_ulong)(unsigned long) &frame->sc;
> +
> +    /* We forgot to include these in the sigcontext.
> +       To avoid breaking binary compatibility, they are passed as args. */
> +    env->regs[4] = 0; // FIXME: no clue... current->thread.trap_no;
> +    env->regs[5] = 0; // FIXME: no clue... current->thread.prot_addr;
> +
> +    /* Place signal number on stack to allow backtrace from handler.  */
> +    if (__put_user(env->regs[2], (int *) &frame->signo)) {
> +            goto give_sigsegv;
> +    }
> +    unlock_user_struct(frame, frame_addr, 1);
> +    return;
> +
> +give_sigsegv:
> +    qemu_log("%s: give_sigsegv\n", __FUNCTION__);
> +    unlock_user_struct(frame, frame_addr, 1);
> +    force_sig(TARGET_SIGSEGV);
> +}
> +
> +static void setup_rt_frame(int sig, struct target_sigaction *ka,
> +                           target_siginfo_t *info,
> +                           target_sigset_t *set, CPUState *env)
> +{
> +    int i;
> +    rt_sigframe *frame;
> +    abi_ulong frame_addr;
> +
> +    frame_addr = get_sigframe(ka, env, sizeof *frame);
> +    qemu_log("%s: frame_addr 0x%llx\n", __FUNCTION__,
> +             (unsigned long long)frame_addr);
> +    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
> +        goto give_sigsegv;
> +    }
> +
> +    qemu_log("%s: 1\n", __FUNCTION__);
> +    if (copy_siginfo_to_user(&frame->info, info)) {
> +        goto give_sigsegv;
> +    }
> +
> +    /* Create the ucontext.  */
> +    __put_user(0, &frame->uc.uc_flags);
> +    __put_user((abi_ulong)0, (abi_ulong *)&frame->uc.uc_link);
> +    __put_user(target_sigaltstack_used.ss_sp, &frame->uc.uc_stack.ss_sp);
> +    __put_user(sas_ss_flags(get_sp_from_cpustate(env)),
> +                      &frame->uc.uc_stack.ss_flags);
> +    __put_user(target_sigaltstack_used.ss_size, &frame->uc.uc_stack.ss_size);
> +    save_sigregs(env, &frame->uc.uc_mcontext);
> +    for (i = 0; i < TARGET_NSIG_WORDS; i++) {
> +        __put_user((abi_ulong)set->sig[i],
> +        (abi_ulong *)&frame->uc.uc_sigmask.sig[i]);
> +    }
> +
> +    /* Set up to return from userspace.  If provided, use a stub
> +       already in userspace.  */
> +    if (ka->sa_flags & TARGET_SA_RESTORER) {
> +        env->regs[14] = (unsigned long) ka->sa_restorer | PSW_ADDR_AMODE;
> +    } else {
> +        env->regs[14] = (unsigned long) frame->retcode | PSW_ADDR_AMODE;
> +        if (__put_user(S390_SYSCALL_OPCODE | TARGET_NR_rt_sigreturn,
> +                       (uint16_t *)(frame->retcode))) {
> +            goto give_sigsegv;
> +        }
> +    }
> +
> +    /* Set up backchain. */
> +    if (__put_user(env->regs[15], (abi_ulong *) frame)) {
> +        goto give_sigsegv;
> +    }
> +
> +    /* Set up registers for signal handler */
> +    env->regs[15] = (target_ulong)(unsigned long) frame;
> +    env->psw.addr = (target_ulong) ka->_sa_handler | PSW_ADDR_AMODE;
> +
> +    env->regs[2] = sig; //map_signal(sig);
> +    env->regs[3] = (target_ulong)(unsigned long) &frame->info;
> +    env->regs[4] = (target_ulong)(unsigned long) &frame->uc;
> +    return;
> +
> +give_sigsegv:
> +    qemu_log("%s: give_sigsegv\n", __FUNCTION__);
> +    unlock_user_struct(frame, frame_addr, 1);
> +    force_sig(TARGET_SIGSEGV);
> +}
> +
> +static int
> +restore_sigregs(CPUState *env, target_sigregs *sc)
> +{
> +    int err = 0;
> +    int i;
> +
> +    for (i = 0; i < 16; i++) {
> +        err |= __get_user(env->regs[i], &sc->regs.gprs[i]);
> +    }
> +
> +    err |= __get_user(env->psw.mask, &sc->regs.psw.mask);
> +    qemu_log("%s: sc->regs.psw.addr 0x%llx env->psw.addr 0x%llx\n",
> +             __FUNCTION__, (unsigned long long)sc->regs.psw.addr,
> +             (unsigned long long)env->psw.addr);
> +    err |= __get_user(env->psw.addr, &sc->regs.psw.addr);
> +    /* FIXME: 31-bit -> | PSW_ADDR_AMODE */
> +
> +    for (i = 0; i < 16; i++) {
> +        err |= __get_user(env->aregs[i], &sc->regs.acrs[i]);
> +    }
> +    for (i = 0; i < 16; i++) {
> +        err |= __get_user(env->fregs[i].ll, &sc->fpregs.fprs[i]);
> +    }
> +
> +    return err;
> +}
> +
> +long do_sigreturn(CPUState *env)
> +{
> +    sigframe *frame;
> +    abi_ulong frame_addr = env->regs[15];
> +    qemu_log("%s: frame_addr 0x%llx\n", __FUNCTION__,
> +             (unsigned long long)frame_addr);
> +    target_sigset_t target_set;
> +    sigset_t set;
> +
> +    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
> +        goto badframe;
> +    }
> +    if (__get_user(target_set.sig[0], &frame->sc.oldmask[0])) {
> +        goto badframe;
> +    }
> +
> +    target_to_host_sigset_internal(&set, &target_set);
> +    sigprocmask(SIG_SETMASK, &set, NULL); /* ~_BLOCKABLE? */
> +
> +    if (restore_sigregs(env, &frame->sregs)) {
> +        goto badframe;
> +    }
> +
> +    unlock_user_struct(frame, frame_addr, 0);
> +    return env->regs[2];
> +
> +badframe:
> +    unlock_user_struct(frame, frame_addr, 0);
> +    force_sig(TARGET_SIGSEGV);
> +    return 0;
> +}
> +
> +long do_rt_sigreturn(CPUState *env)
> +{
> +    rt_sigframe *frame;
> +    abi_ulong frame_addr = env->regs[15];
> +    qemu_log("%s: frame_addr 0x%llx\n", __FUNCTION__,
> +             (unsigned long long)frame_addr);
> +    sigset_t set;
> +
> +    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
> +        goto badframe;
> +    }
> +    target_to_host_sigset(&set, &frame->uc.uc_sigmask);
> +
> +    sigprocmask(SIG_SETMASK, &set, NULL); /* ~_BLOCKABLE? */
> +
> +    if (restore_sigregs(env, &frame->uc.uc_mcontext)) {
> +        goto badframe;
> +    }
> +
> +    if (do_sigaltstack(frame_addr + offsetof(rt_sigframe, uc.uc_stack), 0,
> +                       get_sp_from_cpustate(env)) == -EFAULT) {
> +        goto badframe;
> +    }
> +    unlock_user_struct(frame, frame_addr, 0);
> +    return env->regs[2];
> +
> +badframe:
> +    unlock_user_struct(frame, frame_addr, 0);
> +    force_sig(TARGET_SIGSEGV);
> +    return 0;
> +}
> +
>  #elif defined(TARGET_PPC) && !defined(TARGET_PPC64)
>  
>  /* FIXME: Many of the structures are defined for both PPC and PPC64, but
> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
> index bb0999d..504b26c 100644
> --- a/linux-user/syscall.c
> +++ b/linux-user/syscall.c
> @@ -5432,7 +5432,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>              ret = get_errno(settimeofday(&tv, NULL));
>          }
>          break;
> -#ifdef TARGET_NR_select
> +#if defined(TARGET_NR_select) && !defined(TARGET_S390X) && !defined(TARGET_S390)
>      case TARGET_NR_select:
>          {
>              struct target_sel_arg_struct *sel;
> @@ -5543,7 +5543,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>  #endif
>  #ifdef TARGET_NR_mmap
>      case TARGET_NR_mmap:
> -#if (defined(TARGET_I386) && defined(TARGET_ABI32)) || defined(TARGET_ARM) || defined(TARGET_M68K) || defined(TARGET_CRIS) || defined(TARGET_MICROBLAZE)
> +#if (defined(TARGET_I386) && defined(TARGET_ABI32)) || defined(TARGET_ARM) || \
> +    defined(TARGET_M68K) || defined(TARGET_CRIS) || defined(TARGET_MICROBLAZE) \
> +    || defined(TARGET_S390X)
>          {
>              abi_ulong *v;
>              abi_ulong v1, v2, v3, v4, v5, v6;
> @@ -6039,6 +6041,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>          ret = get_errno(do_fork(cpu_env, arg1, arg2, arg3, arg5, arg4));
>  #elif defined(TARGET_CRIS)
>          ret = get_errno(do_fork(cpu_env, arg2, arg1, arg3, arg4, arg5));
> +#elif defined(TARGET_S390X)
> +        ret = get_errno(do_fork(cpu_env, arg2, arg1, arg3, arg5, arg4));
>  #else
>          ret = get_errno(do_fork(cpu_env, arg1, arg2, arg3, arg4, arg5));
>  #endif
> @@ -6247,8 +6251,12 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>          }
>          break;
>  #endif /* TARGET_NR_getdents64 */
> -#ifdef TARGET_NR__newselect
> +#if defined(TARGET_NR__newselect) || defined(TARGET_S390X)
> +#ifdef TARGET_S390X
> +    case TARGET_NR_select:
> +#else
>      case TARGET_NR__newselect:
> +#endif
>          ret = do_select(arg1, arg2, arg3, arg4, arg5);
>          break;
>  #endif
> @@ -6576,7 +6584,7 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
>      case TARGET_NR_sigaltstack:
>  #if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_MIPS) || \
>      defined(TARGET_SPARC) || defined(TARGET_PPC) || defined(TARGET_ALPHA) || \
> -    defined(TARGET_M68K)
> +    defined(TARGET_M68K) || defined(TARGET_S390X)
>          ret = do_sigaltstack(arg1, arg2, get_sp_from_cpustate((CPUState *)cpu_env));
>          break;
>  #else
> diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
> index bde8921..162d88a 100644
> --- a/linux-user/syscall_defs.h
> +++ b/linux-user/syscall_defs.h
> @@ -55,7 +55,8 @@
>  #endif
>  
>  #if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SH4) \
> -    || defined(TARGET_M68K) || defined(TARGET_CRIS) || defined(TARGET_UNICORE32)
> +    || defined(TARGET_M68K) || defined(TARGET_CRIS) || defined(TARGET_UNICORE32) \
> +    || defined(TARGET_S390X)
>  
>  #define TARGET_IOC_SIZEBITS	14
>  #define TARGET_IOC_DIRBITS	2
> @@ -318,7 +319,8 @@ int do_sigaction(int sig, const struct target_sigaction *act,
>  #if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SPARC) \
>      || defined(TARGET_PPC) || defined(TARGET_MIPS) || defined(TARGET_SH4) \
>      || defined(TARGET_M68K) || defined(TARGET_ALPHA) || defined(TARGET_CRIS) \
> -    || defined(TARGET_MICROBLAZE) || defined(TARGET_UNICORE32)
> +    || defined(TARGET_MICROBLAZE) || defined(TARGET_UNICORE32) \
> +    || defined(TARGET_S390X)
>  
>  #if defined(TARGET_SPARC)
>  #define TARGET_SA_NOCLDSTOP    8u
> @@ -1682,6 +1684,27 @@ struct target_stat {
>  
>    	abi_long	__unused[3];
>  };
> +#elif defined(TARGET_S390X)
> +struct target_stat {
> +    abi_ulong  st_dev;
> +    abi_ulong  st_ino;
> +    abi_ulong  st_nlink;
> +    unsigned int   st_mode;
> +    unsigned int   st_uid;
> +    unsigned int   st_gid;
> +    unsigned int   __pad1;
> +    abi_ulong  st_rdev;
> +    abi_ulong  st_size;
> +    abi_ulong  target_st_atime;
> +    abi_ulong  target_st_atime_nsec;
> +    abi_ulong  target_st_mtime;
> +    abi_ulong  target_st_mtime_nsec;
> +    abi_ulong  target_st_ctime;
> +    abi_ulong  target_st_ctime_nsec;
> +    abi_ulong  st_blksize;
> +    abi_long       st_blocks;
> +    abi_ulong  __unused[3];
> +};
>  #else
>  #error unsupported CPU
>  #endif
> @@ -1768,6 +1791,34 @@ struct target_statfs64 {
>  	abi_long f_frsize;
>  	abi_long f_spare[5];
>  };
> +#elif defined(TARGET_S390X)
> +struct target_statfs {
> +    int32_t  f_type;
> +    int32_t  f_bsize;
> +    abi_long f_blocks;
> +    abi_long f_bfree;
> +    abi_long f_bavail;
> +    abi_long f_files;
> +    abi_long f_ffree;
> +    kernel_fsid_t f_fsid;
> +    int32_t  f_namelen;
> +    int32_t  f_frsize;
> +    int32_t  f_spare[5];
> +};
> +
> +struct target_statfs64 {
> +    int32_t  f_type;
> +    int32_t  f_bsize;
> +    abi_long f_blocks;
> +    abi_long f_bfree;
> +    abi_long f_bavail;
> +    abi_long f_files;
> +    abi_long f_ffree;
> +    kernel_fsid_t f_fsid;
> +    int32_t  f_namelen;
> +    int32_t  f_frsize;
> +    int32_t  f_spare[5];
> +};
>  #else
>  struct target_statfs {
>  	uint32_t f_type;
> diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
> index c50beb7..83a44d8 100644
> --- a/scripts/qemu-binfmt-conf.sh
> +++ b/scripts/qemu-binfmt-conf.sh
> @@ -1,5 +1,5 @@
>  #!/bin/sh
> -# enable automatic i386/ARM/M68K/MIPS/SPARC/PPC program execution by the kernel
> +# enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390 program execution by the kernel
>  
>  # load the binfmt_misc module
>  if [ ! -d /proc/sys/fs/binfmt_misc ]; then
> @@ -63,4 +63,6 @@ fi
>  if [ $cpu != "sh" ] ; then
>      echo    ':sh4:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-sh4:' > /proc/sys/fs/binfmt_misc/register
>      echo    ':sh4eb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-sh4eb:' > /proc/sys/fs/binfmt_misc/register
> +if [ $cpu != "s390x" ] ; then
> +    echo   ':s390x:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-s390x:' > /proc/sys/fs/binfmt_misc/register
>  fi
> -- 
> 1.6.0.2
>