Re: [Qemu-devel] [PATCH v7 15/16] target-or32: Add linux user support

[Jia Liu]

Hi Blue,

On Thu, Jun 28, 2012 at 2:00 AM, Blue Swirl <address@hidden> wrote:
> On Wed, Jun 27, 2012 at 9:54 AM, Jia Liu <address@hidden> wrote:
>> Add QEMU OpenRISC linux user support.
>>
>> Signed-off-by: Jia Liu <address@hidden>
>> ---
>>  configure                           |    1 +
>>  default-configs/or32-linux-user.mak |    1 +
>>  linux-user/elfload.c                |   41 +++++++
>>  linux-user/main.c                   |  100 +++++++++++++++
>>  linux-user/signal.c                 |  229 
>> +++++++++++++++++++++++++++++++++++
>>  linux-user/syscall.c                |    2 +-
>>  linux-user/syscall_defs.h           |   40 +++++-
>>  target-openrisc/cpu.h               |   12 ++
>>  8 files changed, 422 insertions(+), 4 deletions(-)
>>  create mode 100644 default-configs/or32-linux-user.mak
>>
>> diff --git a/configure b/configure
>> index 166a854..593f1d3 100755
>> --- a/configure
>> +++ b/configure
>> @@ -956,6 +956,7 @@ microblaze-linux-user \
>>  microblazeel-linux-user \
>>  mips-linux-user \
>>  mipsel-linux-user \
>> +or32-linux-user \
>>  ppc-linux-user \
>>  ppc64-linux-user \
>>  ppc64abi32-linux-user \
>> diff --git a/default-configs/or32-linux-user.mak 
>> b/default-configs/or32-linux-user.mak
>> new file mode 100644
>> index 0000000..808c1f9
>> --- /dev/null
>> +++ b/default-configs/or32-linux-user.mak
>> @@ -0,0 +1 @@
>> +# Default configuration for or32-linux-user
>> diff --git a/linux-user/elfload.c b/linux-user/elfload.c
>> index f3b1552..6b622d4 100644
>> --- a/linux-user/elfload.c
>> +++ b/linux-user/elfload.c
>> @@ -787,6 +787,47 @@ static void elf_core_copy_regs(target_elf_gregset_t 
>> *regs, const CPUMBState *env
>>
>>  #endif /* TARGET_MICROBLAZE */
>>
>> +#ifdef TARGET_OPENRISC
>> +
>> +#define ELF_START_MMAP 0x08000000
>> +
>> +#define elf_check_arch(x) ((x) == EM_OPENRISC)
>> +
>> +#define ELF_ARCH EM_OPENRISC
>> +#define ELF_CLASS ELFCLASS32
>> +#define ELF_DATA  ELFDATA2MSB
>> +
>> +static inline void init_thread(struct target_pt_regs *regs,
>> +                               struct image_info *infop)
>> +{
>> +    regs->pc = infop->entry;
>> +    regs->gpr[1] = infop->start_stack;
>> +}
>> +
>> +#define USE_ELF_CORE_DUMP
>> +#define ELF_EXEC_PAGESIZE 8192
>> +
>> +/* See linux kernel arch/openrisc/include/asm/elf.h.  */
>> +#define ELF_NREG 34 /* gprs and pc, sr */
>> +typedef target_elf_greg_t target_elf_gregset_t[ELF_NREG];
>> +
>> +static void elf_core_copy_regs(target_elf_gregset_t *regs,
>> +                               const CPUOpenRISCState *env)
>> +{
>> +    int i;
>> +
>> +    for (i = 0; i < 32; i++) {
>> +        (*regs)[i] = tswapl(env->gpr[i]);
>> +    }
>> +
>> +    (*regs)[32] = tswapl(env->pc);
>> +    (*regs)[33] = tswapl(env->sr);
>> +}
>> +#define ELF_HWCAP 0
>> +#define ELF_PLATFORM NULL
>> +
>> +#endif /* TARGET_OPENRISC */
>> +
>>  #ifdef TARGET_SH4
>>
>>  #define ELF_START_MMAP 0x80000000
>> diff --git a/linux-user/main.c b/linux-user/main.c
>> index d0e0e4f..7ed897d 100644
>> --- a/linux-user/main.c
>> +++ b/linux-user/main.c
>> @@ -2306,6 +2306,93 @@ done_syscall:
>>  }
>>  #endif
>>
>> +#ifdef TARGET_OPENRISC
>> +
>> +void cpu_loop(CPUOpenRISCState *env)
>> +{
>> +    int trapnr, gdbsig;
>> +
>> +    for (;;) {
>> +        trapnr = cpu_exec(env);
>> +        gdbsig = 0;
>> +
>> +        switch (trapnr) {
>> +        case EXCP_RESET:
>> +            fprintf(stderr, "\nReset request, exit, pc is %#x\n", env->pc);
>> +            exit(1);
>> +            break;
>> +        case EXCP_BUSERR:
>> +            fprintf(stderr, "\nBus error, exit, pc is %#x\n", env->pc);
>> +            gdbsig = SIGBUS;
>> +            break;
>> +        case EXCP_DPF:
>> +        case EXCP_IPF:
>> +            cpu_dump_state(env, stderr, fprintf, 0);
>> +            gdbsig = TARGET_SIGSEGV;
>> +            break;
>> +        case EXCP_TICK:
>> +            fprintf(stderr, "\nTick time interrupt pc is %#x\n", env->pc);
>> +            break;
>> +        case EXCP_ALIGN:
>> +            fprintf(stderr, "\nAlignment pc is %#x\n", env->pc);
>> +            gdbsig = SIGBUS;
>> +            break;
>> +        case EXCP_ILLEGAL:
>> +            fprintf(stderr, "\nIllegal instructionpc is %#x\n", env->pc);
>> +            gdbsig = SIGILL;
>> +            break;
>> +        case EXCP_INT:
>> +            fprintf(stderr, "\nExternal interruptpc is %#x\n", env->pc);
>> +            break;
>> +        case EXCP_DTLBMISS:
>> +        case EXCP_ITLBMISS:
>> +            printf("TLB miss\n");
>> +            break;
>> +        case EXCP_RANGE:
>> +            fprintf(stderr, "\nRange\n");
>> +            gdbsig = SIGSEGV;
>> +            break;
>> +        case EXCP_SYSCALL:
>> +            env->pc += 4;   /* 0xc00; */
>> +            env->gpr[11] = do_syscall(env,
>> +                                      env->gpr[11], /* return value       */
>> +                                      env->gpr[3],  /* r3 - r7 are params */
>> +                                      env->gpr[4],
>> +                                      env->gpr[5],
>> +                                      env->gpr[6],
>> +                                      env->gpr[7],
>> +                                      env->gpr[8], 0, 0);
>> +            break;
>> +        case EXCP_FPE:
>> +            fprintf(stderr, "Floating point error\n");
>> +            break;
>> +        case EXCP_TRAP:
>> +            fprintf(stderr, "Trap\n");
>> +            gdbsig = SIGTRAP;
>> +            break;
>> +        case EXCP_NR:
>> +            fprintf(stderr, "NR\n");
>
> The above non-fatal fprintfs and printfs should be converted to
> DPRINTFs, tracepoints or qemu_log(LOG_UNIMP) or simply removed.
>

Thanks, I will use qemu_log or remove them.

>> +            break;
>> +        default:
>> +            fprintf(stderr, "qemu: unhandled CPU exception %#x - 
>> aborting\n", \
>> +                    trapnr);
>> +            cpu_dump_state(env, stderr, fprintf, 0);
>> +            gdbsig = TARGET_SIGILL;
>> +            break;
>> +        }
>> +        if (gdbsig) {
>> +            gdb_handlesig(env, gdbsig);
>> +            if (gdbsig != TARGET_SIGTRAP) {
>> +                exit(1);
>> +            }
>> +        }
>> +
>> +        process_pending_signals(env);
>> +    }
>> +}
>> +
>> +#endif /* TARGET_OPENRISC */
>> +
>>  #ifdef TARGET_SH4
>>  void cpu_loop(CPUSH4State *env)
>>  {
>> @@ -3386,6 +3473,8 @@ int main(int argc, char **argv, char **envp)
>>  #else
>>         cpu_model = "24Kf";
>>  #endif
>> +#elif defined TARGET_OPENRISC
>> +        cpu_model = "or1200";
>>  #elif defined(TARGET_PPC)
>>  #ifdef TARGET_PPC64
>>         cpu_model = "970fx";
>> @@ -3788,6 +3877,17 @@ int main(int argc, char **argv, char **envp)
>>             env->hflags |= MIPS_HFLAG_M16;
>>         }
>>     }
>> +#elif defined(TARGET_OPENRISC)
>> +    {
>> +        int i;
>> +
>> +        for (i = 0; i < 32; i++) {
>> +            env->gpr[i] = regs->gpr[i];
>> +        }
>> +
>> +        env->sr = regs->sr;
>> +        env->pc = regs->pc;
>> +    }
>>  #elif defined(TARGET_SH4)
>>     {
>>         int i;
>> diff --git a/linux-user/signal.c b/linux-user/signal.c
>> index 43346dc..85846d4 100644
>> --- a/linux-user/signal.c
>> +++ b/linux-user/signal.c
>> @@ -3629,6 +3629,235 @@ long do_rt_sigreturn(CPUCRISState *env)
>>     return -TARGET_ENOSYS;
>>  }
>>
>> +#elif defined(TARGET_OPENRISC)
>> +
>> +struct target_sigcontext {
>> +    struct target_pt_regs regs;
>> +    abi_ulong oldmask;
>> +    abi_ulong usp;
>> +};
>> +
>> +struct target_ucontext {
>> +    abi_ulong tuc_flags;
>> +    abi_ulong tuc_link;
>> +    target_stack_t tuc_stack;
>> +    struct target_sigcontext tuc_mcontext;
>> +    target_sigset_t tuc_sigmask;   /* mask last for extensibility */
>> +};
>> +
>> +struct target_rt_sigframe {
>> +    abi_ulong pinfo;
>> +    uint64_t puc;
>> +    struct target_siginfo info;
>> +    struct target_sigcontext sc;
>> +    struct target_ucontext uc;
>> +    unsigned char retcode[16];  /* trampoline code */
>> +};
>> +
>> +/* This is the asm-generic/ucontext.h version */
>> +#if 0
>> +static int restore_sigcontext(CPUOpenRISCState *regs,
>> +                              struct target_sigcontext *sc)
>> +{
>> +    unsigned int err = 0;
>> +    unsigned long old_usp;
>> +
>> +    /* Alwys make any pending restarted system call return -EINTR */
>> +    current_thread_info()->restart_block.fn = do_no_restart_syscall;
>> +
>> +    /* restore the regs from &sc->regs (same as sc, since regs is first)
>> +     * (sc is already checked for VERIFY_READ since the sigframe was
>> +     *  checked in sys_sigreturn previously)
>> +     */
>> +
>> +    if (copy_from_user(regs, &sc, sizeof(struct target_pt_regs))) {
>> +        goto badframe;
>> +    }
>> +
>> +    /* make sure the U-flag is set so user-mode cannot fool us */
>> +
>> +    regs->sr &= ~SR_SM;
>> +
>> +    /* restore the old USP as it was before we stacked the sc etc.
>> +     * (we cannot just pop the sigcontext since we aligned the sp and
>> +     *  stuff after pushing it)
>> +     */
>> +
>> +    err |= __get_user(old_usp, &sc->usp);
>> +    phx_signal("old_usp 0x%lx", old_usp);
>> +
>> +    __PHX__ REALLY           /* ??? */
>> +    wrusp(old_usp);
>> +    regs->gpr[1] = old_usp;
>> +
>> +    /* TODO: the other ports use regs->orig_XX to disable syscall checks
>> +     * after this completes, but we don't use that mechanism. maybe we can
>> +     * use it now ?
>> +     */
>> +
>> +    return err;
>> +
>> +badframe:
>> +    return 1;
>> +}
>> +#endif
>> +
>> +/* Set up a signal frame.  */
>> +
>> +static int setup_sigcontext(struct target_sigcontext *sc,
>> +                            CPUOpenRISCState *regs,
>> +                            unsigned long mask)
>> +{
>> +    int err = 0;
>> +    unsigned long usp = regs->gpr[1];
>> +
>> +    /* copy the regs. they are first in sc so we can use sc directly */
>> +
>> +    /*err |= copy_to_user(&sc, regs, sizeof(struct target_pt_regs));*/
>> +
>> +    /* Set the frametype to CRIS_FRAME_NORMAL for the execution of
>> +       the signal handler. The frametype will be restored to its previous
>> +       value in restore_sigcontext. */
>> +    /*regs->frametype = CRIS_FRAME_NORMAL;*/
>> +
>> +    /* then some other stuff */
>> +    err |= __put_user(mask, &sc->oldmask);
>> +    err |= __put_user(usp, &sc->usp); return err;
>> +}
>> +
>> +static inline unsigned long align_sigframe(unsigned long sp)
>> +{
>> +    unsigned long i;
>> +    i = sp & ~3UL;
>> +    return i;
>> +}
>> +
>> +static inline abi_ulong get_sigframe(struct target_sigaction *ka,
>> +                                     CPUOpenRISCState *regs,
>> +                                     size_t frame_size)
>> +{
>> +    unsigned long sp = regs->gpr[1];
>> +    int onsigstack = on_sig_stack(sp);
>> +
>> +    /* redzone */
>> +    /* This is the X/Open sanctioned signal stack switching.  */
>> +    if ((ka->sa_flags & SA_ONSTACK) != 0 && !onsigstack) {
>> +        sp = target_sigaltstack_used.ss_sp + 
>> target_sigaltstack_used.ss_size;
>> +    }
>> +
>> +    sp = align_sigframe(sp - frame_size);
>> +
>> +    /*
>> +     * If we are on the alternate signal stack and would overflow it, don't.
>> +     * Return an always-bogus address instead so we will die with SIGSEGV.
>> +     */
>> +
>> +    if (onsigstack && !likely(on_sig_stack(sp))) {
>> +        return -1L;
>> +    }
>> +
>> +    return sp;
>> +}
>> +
>> +static void setup_frame(int sig, struct target_sigaction *ka,
>> +                        target_sigset_t *set, CPUOpenRISCState *env)
>> +{
>> +    printf("Not implement.\n");
>> +}
>> +
>> +static void setup_rt_frame(int sig, struct target_sigaction *ka,
>> +                           target_siginfo_t *info,
>> +                           target_sigset_t *set, CPUOpenRISCState *env)
>> +{
>> +    int err = 0;
>> +    abi_ulong frame_addr;
>> +    unsigned long return_ip;
>> +    struct target_rt_sigframe *frame;
>> +    abi_ulong info_addr, uc_addr;
>> +
>> +    frame_addr = get_sigframe(ka, env, sizeof *frame);
>> +
>> +    frame_addr = get_sigframe(ka, env, sizeof(*frame));
>> +    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
>> +        goto give_sigsegv;
>> +    }
>> +
>> +    info_addr = frame_addr + offsetof(struct target_rt_sigframe, info);
>> +    err |= __put_user(info_addr, &frame->pinfo);
>> +    uc_addr = frame_addr + offsetof(struct target_rt_sigframe, uc);
>> +    err |= __put_user(uc_addr, &frame->puc);
>> +
>> +    if (ka->sa_flags & SA_SIGINFO) {
>> +        err |= copy_siginfo_to_user(&frame->info, info);
>> +    }
>> +    if (err) {
>> +        goto give_sigsegv;
>> +    }
>> +
>> +    /*err |= __clear_user(&frame->uc, offsetof(struct ucontext, 
>> uc_mcontext));*/
>> +    err |= __put_user(0, &frame->uc.tuc_flags);
>> +    err |= __put_user(0, &frame->uc.tuc_link);
>> +    err |= __put_user(target_sigaltstack_used.ss_sp,
>> +                      &frame->uc.tuc_stack.ss_sp);
>> +    err |= __put_user(sas_ss_flags(env->gpr[1]), 
>> &frame->uc.tuc_stack.ss_flags);
>> +    err |= __put_user(target_sigaltstack_used.ss_size,
>> +                      &frame->uc.tuc_stack.ss_size);
>> +    err |= setup_sigcontext(&frame->sc, env, set->sig[0]);
>> +
>> +    /*err |= copy_to_user(frame->uc.tuc_sigmask, set, sizeof(*set));*/
>> +
>> +    if (err) {
>> +        goto give_sigsegv;
>> +    }
>> +
>> +    /* trampoline - the desired return ip is the retcode itself */
>> +    return_ip = (unsigned long)&frame->retcode;
>> +    /* This is l.ori r11,r0,__NR_sigreturn, l.sys 1 */
>> +    err |= __put_user(0xa960, (short *)(frame->retcode + 0));
>> +    err |= __put_user(TARGET_NR_rt_sigreturn, (short *)(frame->retcode + 
>> 2));
>> +    err |= __put_user(0x20000001, (unsigned long *)(frame->retcode + 4));
>> +    err |= __put_user(0x15000000, (unsigned long *)(frame->retcode + 8));
>> +
>> +    if (err) {
>> +        goto give_sigsegv;
>> +    }
>> +
>> +    /* TODO what is the current->exec_domain stuff and invmap ? */
>> +
>> +    /* Set up registers for signal handler */
>> +    env->pc = (unsigned long)ka->_sa_handler; /* what we enter NOW */
>> +    env->gpr[9] = (unsigned long)return_ip;     /* what we enter LATER */
>> +    env->gpr[3] = (unsigned long)sig;           /* arg 1: signo */
>> +    env->gpr[4] = (unsigned long)&frame->info;  /* arg 2: (siginfo_t*) */
>> +    env->gpr[5] = (unsigned long)&frame->uc;    /* arg 3: ucontext */
>> +
>> +    /* actually move the usp to reflect the stacked frame */
>> +    env->gpr[1] = (unsigned long)frame;
>> +
>> +    return;
>> +
>> +give_sigsegv:
>> +    unlock_user_struct(frame, frame_addr, 1);
>> +    if (sig == TARGET_SIGSEGV) {
>> +        ka->_sa_handler = TARGET_SIG_DFL;
>> +    }
>> +    force_sig(TARGET_SIGSEGV);
>> +}
>> +
>> +long do_sigreturn(CPUOpenRISCState *env)
>> +{
>> +
>> +    fprintf(stderr, "do_sigreturn: not implemented\n");
>> +    return -TARGET_ENOSYS;
>> +}
>> +
>> +long do_rt_sigreturn(CPUOpenRISCState *env)
>> +{
>> +    fprintf(stderr, "do_rt_sigreturn: not implemented\n");
>> +    return -TARGET_ENOSYS;
>> +}
>> +/* TARGET_OPENRISC */
>> +
>>  #elif defined(TARGET_S390X)
>>
>>  #define __NUM_GPRS 16
>> diff --git a/linux-user/syscall.c b/linux-user/syscall.c
>> index 539af3f..630a455 100644
>> --- a/linux-user/syscall.c
>> +++ b/linux-user/syscall.c
>> @@ -7377,7 +7377,7 @@ 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_S390X)
>> +    defined(TARGET_M68K) || defined(TARGET_S390X) || 
>> defined(TARGET_OPENRISC)
>>         ret = do_sigaltstack(arg1, arg2, get_sp_from_cpustate((CPUArchState 
>> *)cpu_env));
>>         break;
>>  #else
>> diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
>> index a79b67d..cfece21 100644
>> --- a/linux-user/syscall_defs.h
>> +++ b/linux-user/syscall_defs.h
>> @@ -59,7 +59,7 @@
>>
>>  #if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SH4) \
>>     || defined(TARGET_M68K) || defined(TARGET_CRIS) || 
>> defined(TARGET_UNICORE32) \
>> -    || defined(TARGET_S390X)
>> +    || defined(TARGET_S390X) || defined(TARGET_OPENRISC)
>>
>>  #define TARGET_IOC_SIZEBITS    14
>>  #define TARGET_IOC_DIRBITS     2
>> @@ -323,7 +323,7 @@ int do_sigaction(int sig, const struct target_sigaction 
>> *act,
>>     || 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_S390X)
>> +    || defined(TARGET_S390X) || defined(TARGET_OPENRISC)
>>
>>  #if defined(TARGET_SPARC)
>>  #define TARGET_SA_NOCLDSTOP    8u
>> @@ -344,6 +344,14 @@ int do_sigaction(int sig, const struct target_sigaction 
>> *act,
>>  #if !defined(TARGET_ABI_MIPSN32) && !defined(TARGET_ABI_MIPSN64)
>>  #define TARGET_SA_RESTORER     0x04000000      /* Only for O32 */
>>  #endif
>> +#elif defined(TARGET_OPENRISC)
>> +#define TARGET_SA_NOCLDSTOP    0x00000001
>> +#define TARGET_SA_NOCLDWAIT    0x00000002
>> +#define TARGET_SA_SIGINFO      0x00000004
>> +#define TARGET_SA_ONSTACK      0x08000000
>> +#define TARGET_SA_RESTART      0x10000000
>> +#define TARGET_SA_NODEFER      0x40000000
>> +#define TARGET_SA_RESETHAND    0x80000000
>>  #elif defined(TARGET_ALPHA)
>>  #define TARGET_SA_ONSTACK      0x00000001
>>  #define TARGET_SA_RESTART      0x00000002
>> @@ -448,6 +456,7 @@ int do_sigaction(int sig, const struct target_sigaction 
>> *act,
>>
>>  #else
>>
>> +/* OpenRISC Using the general signals */
>>  #define TARGET_SIGHUP           1
>>  #define TARGET_SIGINT           2
>>  #define TARGET_SIGQUIT          3
>> @@ -1086,7 +1095,8 @@ struct target_winsize {
>>  #endif
>>
>>  #if (defined(TARGET_I386) && defined(TARGET_ABI32)) || defined(TARGET_ARM) \
>> -    || defined(TARGET_CRIS) || defined(TARGET_UNICORE32)
>> +    || defined(TARGET_CRIS) || defined(TARGET_UNICORE32) \
>> +    || defined(TARGET_OPENRISC)
>>  struct target_stat {
>>        unsigned short st_dev;
>>        unsigned short __pad1;
>> @@ -1783,6 +1793,30 @@ struct target_stat {
>>     abi_long       st_blocks;
>>     abi_ulong  __unused[3];
>>  };
>> +#elif defined(TARGET_OPENRISC)
>> +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 __pad0;
>> +    abi_ulong st_rdev;
>> +    abi_long st_size;
>> +    abi_long st_blksize;
>> +    abi_long st_blocks;    /* Number 512-byte blocks allocated. */
>> +
>> +    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_long __unused[3];
>> +};
>>  #else
>>  #error unsupported CPU
>>  #endif
>> diff --git a/target-openrisc/cpu.h b/target-openrisc/cpu.h
>> index d499dc4..34dd844 100644
>> --- a/target-openrisc/cpu.h
>> +++ b/target-openrisc/cpu.h
>> @@ -364,11 +364,13 @@ void do_interrupt(CPUOpenRISCState *env);
>>  void openrisc_translate_init(void);
>>  int cpu_openrisc_handle_mmu_fault(CPUOpenRISCState *env, target_ulong 
>> address,
>>                                   int rw, int mmu_idx);
>> +int cpu_openrisc_signal_handler(int host_signum, void *pinfo, void *puc);
>>
>>  #define cpu_list cpu_openrisc_list
>>  #define cpu_exec cpu_openrisc_exec
>>  #define cpu_gen_code cpu_openrisc_gen_code
>>  #define cpu_handle_mmu_fault cpu_openrisc_handle_mmu_fault
>> +#define cpu_signal_handler cpu_openrisc_signal_handler
>>
>>  #define CPU_SAVE_VERSION 1
>>
>> @@ -400,6 +402,16 @@ static inline CPUOpenRISCState *cpu_init(const char 
>> *cpu_model)
>>     return NULL;
>>  }
>>
>> +#if defined(CONFIG_USER_ONLY)
>> +static inline void cpu_clone_regs(CPUOpenRISCState *env, target_ulong newsp)
>> +{
>> +    if (newsp) {
>> +        env->gpr[1] = newsp;
>> +    }
>> +    env->gpr[2] = 0;
>> +}
>> +#endif
>> +
>>  #include "cpu-all.h"
>>
>>  static inline void cpu_get_tb_cpu_state(CPUOpenRISCState *env,
>> --
>> 1.7.9.5
>>
>>

Regards,
Jia.