Re: [qemu-s390x] [PATCH for 2.13 v2 18/20] linux-user: move mips/mips64 signal.c parts to mips directory

[Philippe Mathieu-Daudé]

On 03/23/2018 07:57 PM, Laurent Vivier wrote:
> No code change, only move code from signal.c to
> mips/signal.c, except adding includes and
> exporting setup_frame() and setup_rt_frame().
> 
> mips64/signal.c includes mips/signal.c
> 
> Signed-off-by: Laurent Vivier <address@hidden>

Reviewed-by: Philippe Mathieu-Daudé <address@hidden>

> ---
>  linux-user/mips/signal.c          | 382 
> ++++++++++++++++++++++++++++++++++++++
>  linux-user/mips/target_signal.h   |   9 +-
>  linux-user/mips64/signal.c        |   2 +
>  linux-user/mips64/target_signal.h |   4 +-
>  linux-user/signal.c               | 381 +------------------------------------
>  5 files changed, 396 insertions(+), 382 deletions(-)
> 
> diff --git a/linux-user/mips/signal.c b/linux-user/mips/signal.c
> index 02ca338b6c..a44e5b59e9 100644
> --- a/linux-user/mips/signal.c
> +++ b/linux-user/mips/signal.c
> @@ -16,3 +16,385 @@
>   *  You should have received a copy of the GNU General Public License
>   *  along with this program; if not, see <http://www.gnu.org/licenses/>.
>   */
> +#include "qemu/osdep.h"
> +#include "qemu.h"
> +#include "target_signal.h"
> +#include "signal-common.h"
> +#include "linux-user/trace.h"
> +
> +# if defined(TARGET_ABI_MIPSO32)
> +struct target_sigcontext {
> +    uint32_t   sc_regmask;     /* Unused */
> +    uint32_t   sc_status;
> +    uint64_t   sc_pc;
> +    uint64_t   sc_regs[32];
> +    uint64_t   sc_fpregs[32];
> +    uint32_t   sc_ownedfp;     /* Unused */
> +    uint32_t   sc_fpc_csr;
> +    uint32_t   sc_fpc_eir;     /* Unused */
> +    uint32_t   sc_used_math;
> +    uint32_t   sc_dsp;         /* dsp status, was sc_ssflags */
> +    uint32_t   pad0;
> +    uint64_t   sc_mdhi;
> +    uint64_t   sc_mdlo;
> +    target_ulong   sc_hi1;         /* Was sc_cause */
> +    target_ulong   sc_lo1;         /* Was sc_badvaddr */
> +    target_ulong   sc_hi2;         /* Was sc_sigset[4] */
> +    target_ulong   sc_lo2;
> +    target_ulong   sc_hi3;
> +    target_ulong   sc_lo3;
> +};
> +# else /* N32 || N64 */
> +struct target_sigcontext {
> +    uint64_t sc_regs[32];
> +    uint64_t sc_fpregs[32];
> +    uint64_t sc_mdhi;
> +    uint64_t sc_hi1;
> +    uint64_t sc_hi2;
> +    uint64_t sc_hi3;
> +    uint64_t sc_mdlo;
> +    uint64_t sc_lo1;
> +    uint64_t sc_lo2;
> +    uint64_t sc_lo3;
> +    uint64_t sc_pc;
> +    uint32_t sc_fpc_csr;
> +    uint32_t sc_used_math;
> +    uint32_t sc_dsp;
> +    uint32_t sc_reserved;
> +};
> +# endif /* O32 */
> +
> +struct sigframe {
> +    uint32_t sf_ass[4];                      /* argument save space for o32 
> */
> +    uint32_t sf_code[2];                     /* signal trampoline */
> +    struct target_sigcontext sf_sc;
> +    target_sigset_t sf_mask;
> +};
> +
> +struct target_ucontext {
> +    target_ulong tuc_flags;
> +    target_ulong tuc_link;
> +    target_stack_t tuc_stack;
> +    target_ulong pad0;
> +    struct target_sigcontext tuc_mcontext;
> +    target_sigset_t tuc_sigmask;
> +};
> +
> +struct target_rt_sigframe {
> +    uint32_t rs_ass[4];               /* argument save space for o32 */
> +    uint32_t rs_code[2];              /* signal trampoline */
> +    struct target_siginfo rs_info;
> +    struct target_ucontext rs_uc;
> +};
> +
> +/* Install trampoline to jump back from signal handler */
> +static inline int install_sigtramp(unsigned int *tramp,   unsigned int 
> syscall)
> +{
> +    int err = 0;
> +
> +    /*
> +     * Set up the return code ...
> +     *
> +     *         li      v0, __NR__foo_sigreturn
> +     *         syscall
> +     */
> +
> +    __put_user(0x24020000 + syscall, tramp + 0);
> +    __put_user(0x0000000c          , tramp + 1);
> +    return err;
> +}
> +
> +static inline void setup_sigcontext(CPUMIPSState *regs,
> +                                    struct target_sigcontext *sc)
> +{
> +    int i;
> +
> +    __put_user(exception_resume_pc(regs), &sc->sc_pc);
> +    regs->hflags &= ~MIPS_HFLAG_BMASK;
> +
> +    __put_user(0, &sc->sc_regs[0]);
> +    for (i = 1; i < 32; ++i) {
> +        __put_user(regs->active_tc.gpr[i], &sc->sc_regs[i]);
> +    }
> +
> +    __put_user(regs->active_tc.HI[0], &sc->sc_mdhi);
> +    __put_user(regs->active_tc.LO[0], &sc->sc_mdlo);
> +
> +    /* Rather than checking for dsp existence, always copy.  The storage
> +       would just be garbage otherwise.  */
> +    __put_user(regs->active_tc.HI[1], &sc->sc_hi1);
> +    __put_user(regs->active_tc.HI[2], &sc->sc_hi2);
> +    __put_user(regs->active_tc.HI[3], &sc->sc_hi3);
> +    __put_user(regs->active_tc.LO[1], &sc->sc_lo1);
> +    __put_user(regs->active_tc.LO[2], &sc->sc_lo2);
> +    __put_user(regs->active_tc.LO[3], &sc->sc_lo3);
> +    {
> +        uint32_t dsp = cpu_rddsp(0x3ff, regs);
> +        __put_user(dsp, &sc->sc_dsp);
> +    }
> +
> +    __put_user(1, &sc->sc_used_math);
> +
> +    for (i = 0; i < 32; ++i) {
> +        __put_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]);
> +    }
> +}
> +
> +static inline void
> +restore_sigcontext(CPUMIPSState *regs, struct target_sigcontext *sc)
> +{
> +    int i;
> +
> +    __get_user(regs->CP0_EPC, &sc->sc_pc);
> +
> +    __get_user(regs->active_tc.HI[0], &sc->sc_mdhi);
> +    __get_user(regs->active_tc.LO[0], &sc->sc_mdlo);
> +
> +    for (i = 1; i < 32; ++i) {
> +        __get_user(regs->active_tc.gpr[i], &sc->sc_regs[i]);
> +    }
> +
> +    __get_user(regs->active_tc.HI[1], &sc->sc_hi1);
> +    __get_user(regs->active_tc.HI[2], &sc->sc_hi2);
> +    __get_user(regs->active_tc.HI[3], &sc->sc_hi3);
> +    __get_user(regs->active_tc.LO[1], &sc->sc_lo1);
> +    __get_user(regs->active_tc.LO[2], &sc->sc_lo2);
> +    __get_user(regs->active_tc.LO[3], &sc->sc_lo3);
> +    {
> +        uint32_t dsp;
> +        __get_user(dsp, &sc->sc_dsp);
> +        cpu_wrdsp(dsp, 0x3ff, regs);
> +    }
> +
> +    for (i = 0; i < 32; ++i) {
> +        __get_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]);
> +    }
> +}
> +
> +/*
> + * Determine which stack to use..
> + */
> +static inline abi_ulong
> +get_sigframe(struct target_sigaction *ka, CPUMIPSState *regs, size_t 
> frame_size)
> +{
> +    unsigned long sp;
> +
> +    /* Default to using normal stack */
> +    sp = regs->active_tc.gpr[29];
> +
> +    /*
> +     * FPU emulator may have its own trampoline active just
> +     * above the user stack, 16-bytes before the next lowest
> +     * 16 byte boundary.  Try to avoid trashing it.
> +     */
> +    sp -= 32;
> +
> +    /* This is the X/Open sanctioned signal stack switching.  */
> +    if ((ka->sa_flags & TARGET_SA_ONSTACK) && (sas_ss_flags (sp) == 0)) {
> +        sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
> +    }
> +
> +    return (sp - frame_size) & ~7;
> +}
> +
> +static void mips_set_hflags_isa_mode_from_pc(CPUMIPSState *env)
> +{
> +    if (env->insn_flags & (ASE_MIPS16 | ASE_MICROMIPS)) {
> +        env->hflags &= ~MIPS_HFLAG_M16;
> +        env->hflags |= (env->active_tc.PC & 1) << MIPS_HFLAG_M16_SHIFT;
> +        env->active_tc.PC &= ~(target_ulong) 1;
> +    }
> +}
> +
> +# if defined(TARGET_ABI_MIPSO32)
> +/* compare linux/arch/mips/kernel/signal.c:setup_frame() */
> +void setup_frame(int sig, struct target_sigaction * ka,
> +                 target_sigset_t *set, CPUMIPSState *regs)
> +{
> +    struct sigframe *frame;
> +    abi_ulong frame_addr;
> +    int i;
> +
> +    frame_addr = get_sigframe(ka, regs, sizeof(*frame));
> +    trace_user_setup_frame(regs, frame_addr);
> +    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
> +        goto give_sigsegv;
> +    }
> +
> +    install_sigtramp(frame->sf_code, TARGET_NR_sigreturn);
> +
> +    setup_sigcontext(regs, &frame->sf_sc);
> +
> +    for(i = 0; i < TARGET_NSIG_WORDS; i++) {
> +        __put_user(set->sig[i], &frame->sf_mask.sig[i]);
> +    }
> +
> +    /*
> +    * Arguments to signal handler:
> +    *
> +    *   a0 = signal number
> +    *   a1 = 0 (should be cause)
> +    *   a2 = pointer to struct sigcontext
> +    *
> +    * $25 and PC point to the signal handler, $29 points to the
> +    * struct sigframe.
> +    */
> +    regs->active_tc.gpr[ 4] = sig;
> +    regs->active_tc.gpr[ 5] = 0;
> +    regs->active_tc.gpr[ 6] = frame_addr + offsetof(struct sigframe, sf_sc);
> +    regs->active_tc.gpr[29] = frame_addr;
> +    regs->active_tc.gpr[31] = frame_addr + offsetof(struct sigframe, 
> sf_code);
> +    /* The original kernel code sets CP0_EPC to the handler
> +    * since it returns to userland using eret
> +    * we cannot do this here, and we must set PC directly */
> +    regs->active_tc.PC = regs->active_tc.gpr[25] = ka->_sa_handler;
> +    mips_set_hflags_isa_mode_from_pc(regs);
> +    unlock_user_struct(frame, frame_addr, 1);
> +    return;
> +
> +give_sigsegv:
> +    force_sigsegv(sig);
> +}
> +
> +long do_sigreturn(CPUMIPSState *regs)
> +{
> +    struct sigframe *frame;
> +    abi_ulong frame_addr;
> +    sigset_t blocked;
> +    target_sigset_t target_set;
> +    int i;
> +
> +    frame_addr = regs->active_tc.gpr[29];
> +    trace_user_do_sigreturn(regs, frame_addr);
> +    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1))
> +        goto badframe;
> +
> +    for(i = 0; i < TARGET_NSIG_WORDS; i++) {
> +        __get_user(target_set.sig[i], &frame->sf_mask.sig[i]);
> +    }
> +
> +    target_to_host_sigset_internal(&blocked, &target_set);
> +    set_sigmask(&blocked);
> +
> +    restore_sigcontext(regs, &frame->sf_sc);
> +
> +#if 0
> +    /*
> +     * Don't let your children do this ...
> +     */
> +    __asm__ __volatile__(
> +     "move\t$29, %0\n\t"
> +     "j\tsyscall_exit"
> +     :/* no outputs */
> +     :"r" (&regs));
> +    /* Unreached */
> +#endif
> +
> +    regs->active_tc.PC = regs->CP0_EPC;
> +    mips_set_hflags_isa_mode_from_pc(regs);
> +    /* I am not sure this is right, but it seems to work
> +    * maybe a problem with nested signals ? */
> +    regs->CP0_EPC = 0;
> +    return -TARGET_QEMU_ESIGRETURN;
> +
> +badframe:
> +    force_sig(TARGET_SIGSEGV);
> +    return -TARGET_QEMU_ESIGRETURN;
> +}
> +# endif /* O32 */
> +
> +void setup_rt_frame(int sig, struct target_sigaction *ka,
> +                    target_siginfo_t *info,
> +                    target_sigset_t *set, CPUMIPSState *env)
> +{
> +    struct target_rt_sigframe *frame;
> +    abi_ulong frame_addr;
> +    int i;
> +
> +    frame_addr = get_sigframe(ka, env, sizeof(*frame));
> +    trace_user_setup_rt_frame(env, frame_addr);
> +    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
> +        goto give_sigsegv;
> +    }
> +
> +    install_sigtramp(frame->rs_code, TARGET_NR_rt_sigreturn);
> +
> +    tswap_siginfo(&frame->rs_info, info);
> +
> +    __put_user(0, &frame->rs_uc.tuc_flags);
> +    __put_user(0, &frame->rs_uc.tuc_link);
> +    __put_user(target_sigaltstack_used.ss_sp, &frame->rs_uc.tuc_stack.ss_sp);
> +    __put_user(target_sigaltstack_used.ss_size, 
> &frame->rs_uc.tuc_stack.ss_size);
> +    __put_user(sas_ss_flags(get_sp_from_cpustate(env)),
> +               &frame->rs_uc.tuc_stack.ss_flags);
> +
> +    setup_sigcontext(env, &frame->rs_uc.tuc_mcontext);
> +
> +    for(i = 0; i < TARGET_NSIG_WORDS; i++) {
> +        __put_user(set->sig[i], &frame->rs_uc.tuc_sigmask.sig[i]);
> +    }
> +
> +    /*
> +    * Arguments to signal handler:
> +    *
> +    *   a0 = signal number
> +    *   a1 = pointer to siginfo_t
> +    *   a2 = pointer to ucontext_t
> +    *
> +    * $25 and PC point to the signal handler, $29 points to the
> +    * struct sigframe.
> +    */
> +    env->active_tc.gpr[ 4] = sig;
> +    env->active_tc.gpr[ 5] = frame_addr
> +                             + offsetof(struct target_rt_sigframe, rs_info);
> +    env->active_tc.gpr[ 6] = frame_addr
> +                             + offsetof(struct target_rt_sigframe, rs_uc);
> +    env->active_tc.gpr[29] = frame_addr;
> +    env->active_tc.gpr[31] = frame_addr
> +                             + offsetof(struct target_rt_sigframe, rs_code);
> +    /* The original kernel code sets CP0_EPC to the handler
> +    * since it returns to userland using eret
> +    * we cannot do this here, and we must set PC directly */
> +    env->active_tc.PC = env->active_tc.gpr[25] = ka->_sa_handler;
> +    mips_set_hflags_isa_mode_from_pc(env);
> +    unlock_user_struct(frame, frame_addr, 1);
> +    return;
> +
> +give_sigsegv:
> +    unlock_user_struct(frame, frame_addr, 1);
> +    force_sigsegv(sig);
> +}
> +
> +long do_rt_sigreturn(CPUMIPSState *env)
> +{
> +    struct target_rt_sigframe *frame;
> +    abi_ulong frame_addr;
> +    sigset_t blocked;
> +
> +    frame_addr = env->active_tc.gpr[29];
> +    trace_user_do_rt_sigreturn(env, frame_addr);
> +    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
> +        goto badframe;
> +    }
> +
> +    target_to_host_sigset(&blocked, &frame->rs_uc.tuc_sigmask);
> +    set_sigmask(&blocked);
> +
> +    restore_sigcontext(env, &frame->rs_uc.tuc_mcontext);
> +
> +    if (do_sigaltstack(frame_addr +
> +                       offsetof(struct target_rt_sigframe, rs_uc.tuc_stack),
> +                       0, get_sp_from_cpustate(env)) == -EFAULT)
> +        goto badframe;
> +
> +    env->active_tc.PC = env->CP0_EPC;
> +    mips_set_hflags_isa_mode_from_pc(env);
> +    /* I am not sure this is right, but it seems to work
> +    * maybe a problem with nested signals ? */
> +    env->CP0_EPC = 0;
> +    return -TARGET_QEMU_ESIGRETURN;
> +
> +badframe:
> +    force_sig(TARGET_SIGSEGV);
> +    return -TARGET_QEMU_ESIGRETURN;
> +}
> diff --git a/linux-user/mips/target_signal.h b/linux-user/mips/target_signal.h
> index 8dd27cef35..22ab3e4a94 100644
> --- a/linux-user/mips/target_signal.h
> +++ b/linux-user/mips/target_signal.h
> @@ -26,5 +26,12 @@ static inline abi_ulong get_sp_from_cpustate(CPUMIPSState 
> *state)
>      return state->active_tc.gpr[29];
>  }
>  
> -
> +# if defined(TARGET_ABI_MIPSO32)
> +/* compare linux/arch/mips/kernel/signal.c:setup_frame() */
> +void setup_frame(int sig, struct target_sigaction * ka,
> +                 target_sigset_t *set, CPUMIPSState *regs);
> +#endif
> +void setup_rt_frame(int sig, struct target_sigaction *ka,
> +                    target_siginfo_t *info,
> +                    target_sigset_t *set, CPUMIPSState *env);
>  #endif /* MIPS_TARGET_SIGNAL_H */
> diff --git a/linux-user/mips64/signal.c b/linux-user/mips64/signal.c
> index 02ca338b6c..4ed0ed90b3 100644
> --- a/linux-user/mips64/signal.c
> +++ b/linux-user/mips64/signal.c
> @@ -16,3 +16,5 @@
>   *  You should have received a copy of the GNU General Public License
>   *  along with this program; if not, see <http://www.gnu.org/licenses/>.
>   */
> +#define MIPS_TARGET_SIGNAL_H /* to only include mips64/target_signal.h */
> +#include "../mips/signal.c"
> diff --git a/linux-user/mips64/target_signal.h 
> b/linux-user/mips64/target_signal.h
> index 67ef5a18f4..70dfe40978 100644
> --- a/linux-user/mips64/target_signal.h
> +++ b/linux-user/mips64/target_signal.h
> @@ -26,5 +26,7 @@ static inline abi_ulong get_sp_from_cpustate(CPUMIPSState 
> *state)
>      return state->active_tc.gpr[29];
>  }
>  
> -
> +void setup_rt_frame(int sig, struct target_sigaction *ka,
> +                    target_siginfo_t *info,
> +                    target_sigset_t *set, CPUMIPSState *env);
>  #endif /* MIPS64_TARGET_SIGNAL_H */
> diff --git a/linux-user/signal.c b/linux-user/signal.c
> index 2bcb32a7ce..92d7347b14 100644
> --- a/linux-user/signal.c
> +++ b/linux-user/signal.c
> @@ -803,386 +803,7 @@ int do_sigaction(int sig, const struct target_sigaction 
> *act,
>      return ret;
>  }
>  
> -#if defined(TARGET_MIPS) || defined(TARGET_MIPS64)
> -
> -# if defined(TARGET_ABI_MIPSO32)
> -struct target_sigcontext {
> -    uint32_t   sc_regmask;     /* Unused */
> -    uint32_t   sc_status;
> -    uint64_t   sc_pc;
> -    uint64_t   sc_regs[32];
> -    uint64_t   sc_fpregs[32];
> -    uint32_t   sc_ownedfp;     /* Unused */
> -    uint32_t   sc_fpc_csr;
> -    uint32_t   sc_fpc_eir;     /* Unused */
> -    uint32_t   sc_used_math;
> -    uint32_t   sc_dsp;         /* dsp status, was sc_ssflags */
> -    uint32_t   pad0;
> -    uint64_t   sc_mdhi;
> -    uint64_t   sc_mdlo;
> -    target_ulong   sc_hi1;         /* Was sc_cause */
> -    target_ulong   sc_lo1;         /* Was sc_badvaddr */
> -    target_ulong   sc_hi2;         /* Was sc_sigset[4] */
> -    target_ulong   sc_lo2;
> -    target_ulong   sc_hi3;
> -    target_ulong   sc_lo3;
> -};
> -# else /* N32 || N64 */
> -struct target_sigcontext {
> -    uint64_t sc_regs[32];
> -    uint64_t sc_fpregs[32];
> -    uint64_t sc_mdhi;
> -    uint64_t sc_hi1;
> -    uint64_t sc_hi2;
> -    uint64_t sc_hi3;
> -    uint64_t sc_mdlo;
> -    uint64_t sc_lo1;
> -    uint64_t sc_lo2;
> -    uint64_t sc_lo3;
> -    uint64_t sc_pc;
> -    uint32_t sc_fpc_csr;
> -    uint32_t sc_used_math;
> -    uint32_t sc_dsp;
> -    uint32_t sc_reserved;
> -};
> -# endif /* O32 */
> -
> -struct sigframe {
> -    uint32_t sf_ass[4];                      /* argument save space for o32 
> */
> -    uint32_t sf_code[2];                     /* signal trampoline */
> -    struct target_sigcontext sf_sc;
> -    target_sigset_t sf_mask;
> -};
> -
> -struct target_ucontext {
> -    target_ulong tuc_flags;
> -    target_ulong tuc_link;
> -    target_stack_t tuc_stack;
> -    target_ulong pad0;
> -    struct target_sigcontext tuc_mcontext;
> -    target_sigset_t tuc_sigmask;
> -};
> -
> -struct target_rt_sigframe {
> -    uint32_t rs_ass[4];               /* argument save space for o32 */
> -    uint32_t rs_code[2];              /* signal trampoline */
> -    struct target_siginfo rs_info;
> -    struct target_ucontext rs_uc;
> -};
> -
> -/* Install trampoline to jump back from signal handler */
> -static inline int install_sigtramp(unsigned int *tramp,   unsigned int 
> syscall)
> -{
> -    int err = 0;
> -
> -    /*
> -     * Set up the return code ...
> -     *
> -     *         li      v0, __NR__foo_sigreturn
> -     *         syscall
> -     */
> -
> -    __put_user(0x24020000 + syscall, tramp + 0);
> -    __put_user(0x0000000c          , tramp + 1);
> -    return err;
> -}
> -
> -static inline void setup_sigcontext(CPUMIPSState *regs,
> -                                    struct target_sigcontext *sc)
> -{
> -    int i;
> -
> -    __put_user(exception_resume_pc(regs), &sc->sc_pc);
> -    regs->hflags &= ~MIPS_HFLAG_BMASK;
> -
> -    __put_user(0, &sc->sc_regs[0]);
> -    for (i = 1; i < 32; ++i) {
> -        __put_user(regs->active_tc.gpr[i], &sc->sc_regs[i]);
> -    }
> -
> -    __put_user(regs->active_tc.HI[0], &sc->sc_mdhi);
> -    __put_user(regs->active_tc.LO[0], &sc->sc_mdlo);
> -
> -    /* Rather than checking for dsp existence, always copy.  The storage
> -       would just be garbage otherwise.  */
> -    __put_user(regs->active_tc.HI[1], &sc->sc_hi1);
> -    __put_user(regs->active_tc.HI[2], &sc->sc_hi2);
> -    __put_user(regs->active_tc.HI[3], &sc->sc_hi3);
> -    __put_user(regs->active_tc.LO[1], &sc->sc_lo1);
> -    __put_user(regs->active_tc.LO[2], &sc->sc_lo2);
> -    __put_user(regs->active_tc.LO[3], &sc->sc_lo3);
> -    {
> -        uint32_t dsp = cpu_rddsp(0x3ff, regs);
> -        __put_user(dsp, &sc->sc_dsp);
> -    }
> -
> -    __put_user(1, &sc->sc_used_math);
> -
> -    for (i = 0; i < 32; ++i) {
> -        __put_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]);
> -    }
> -}
> -
> -static inline void
> -restore_sigcontext(CPUMIPSState *regs, struct target_sigcontext *sc)
> -{
> -    int i;
> -
> -    __get_user(regs->CP0_EPC, &sc->sc_pc);
> -
> -    __get_user(regs->active_tc.HI[0], &sc->sc_mdhi);
> -    __get_user(regs->active_tc.LO[0], &sc->sc_mdlo);
> -
> -    for (i = 1; i < 32; ++i) {
> -        __get_user(regs->active_tc.gpr[i], &sc->sc_regs[i]);
> -    }
> -
> -    __get_user(regs->active_tc.HI[1], &sc->sc_hi1);
> -    __get_user(regs->active_tc.HI[2], &sc->sc_hi2);
> -    __get_user(regs->active_tc.HI[3], &sc->sc_hi3);
> -    __get_user(regs->active_tc.LO[1], &sc->sc_lo1);
> -    __get_user(regs->active_tc.LO[2], &sc->sc_lo2);
> -    __get_user(regs->active_tc.LO[3], &sc->sc_lo3);
> -    {
> -        uint32_t dsp;
> -        __get_user(dsp, &sc->sc_dsp);
> -        cpu_wrdsp(dsp, 0x3ff, regs);
> -    }
> -
> -    for (i = 0; i < 32; ++i) {
> -        __get_user(regs->active_fpu.fpr[i].d, &sc->sc_fpregs[i]);
> -    }
> -}
> -
> -/*
> - * Determine which stack to use..
> - */
> -static inline abi_ulong
> -get_sigframe(struct target_sigaction *ka, CPUMIPSState *regs, size_t 
> frame_size)
> -{
> -    unsigned long sp;
> -
> -    /* Default to using normal stack */
> -    sp = regs->active_tc.gpr[29];
> -
> -    /*
> -     * FPU emulator may have its own trampoline active just
> -     * above the user stack, 16-bytes before the next lowest
> -     * 16 byte boundary.  Try to avoid trashing it.
> -     */
> -    sp -= 32;
> -
> -    /* This is the X/Open sanctioned signal stack switching.  */
> -    if ((ka->sa_flags & TARGET_SA_ONSTACK) && (sas_ss_flags (sp) == 0)) {
> -        sp = target_sigaltstack_used.ss_sp + target_sigaltstack_used.ss_size;
> -    }
> -
> -    return (sp - frame_size) & ~7;
> -}
> -
> -static void mips_set_hflags_isa_mode_from_pc(CPUMIPSState *env)
> -{
> -    if (env->insn_flags & (ASE_MIPS16 | ASE_MICROMIPS)) {
> -        env->hflags &= ~MIPS_HFLAG_M16;
> -        env->hflags |= (env->active_tc.PC & 1) << MIPS_HFLAG_M16_SHIFT;
> -        env->active_tc.PC &= ~(target_ulong) 1;
> -    }
> -}
> -
> -# if defined(TARGET_ABI_MIPSO32)
> -/* compare linux/arch/mips/kernel/signal.c:setup_frame() */
> -static void setup_frame(int sig, struct target_sigaction * ka,
> -                        target_sigset_t *set, CPUMIPSState *regs)
> -{
> -    struct sigframe *frame;
> -    abi_ulong frame_addr;
> -    int i;
> -
> -    frame_addr = get_sigframe(ka, regs, sizeof(*frame));
> -    trace_user_setup_frame(regs, frame_addr);
> -    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
> -        goto give_sigsegv;
> -    }
> -
> -    install_sigtramp(frame->sf_code, TARGET_NR_sigreturn);
> -
> -    setup_sigcontext(regs, &frame->sf_sc);
> -
> -    for(i = 0; i < TARGET_NSIG_WORDS; i++) {
> -        __put_user(set->sig[i], &frame->sf_mask.sig[i]);
> -    }
> -
> -    /*
> -    * Arguments to signal handler:
> -    *
> -    *   a0 = signal number
> -    *   a1 = 0 (should be cause)
> -    *   a2 = pointer to struct sigcontext
> -    *
> -    * $25 and PC point to the signal handler, $29 points to the
> -    * struct sigframe.
> -    */
> -    regs->active_tc.gpr[ 4] = sig;
> -    regs->active_tc.gpr[ 5] = 0;
> -    regs->active_tc.gpr[ 6] = frame_addr + offsetof(struct sigframe, sf_sc);
> -    regs->active_tc.gpr[29] = frame_addr;
> -    regs->active_tc.gpr[31] = frame_addr + offsetof(struct sigframe, 
> sf_code);
> -    /* The original kernel code sets CP0_EPC to the handler
> -    * since it returns to userland using eret
> -    * we cannot do this here, and we must set PC directly */
> -    regs->active_tc.PC = regs->active_tc.gpr[25] = ka->_sa_handler;
> -    mips_set_hflags_isa_mode_from_pc(regs);
> -    unlock_user_struct(frame, frame_addr, 1);
> -    return;
> -
> -give_sigsegv:
> -    force_sigsegv(sig);
> -}
> -
> -long do_sigreturn(CPUMIPSState *regs)
> -{
> -    struct sigframe *frame;
> -    abi_ulong frame_addr;
> -    sigset_t blocked;
> -    target_sigset_t target_set;
> -    int i;
> -
> -    frame_addr = regs->active_tc.gpr[29];
> -    trace_user_do_sigreturn(regs, frame_addr);
> -    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1))
> -        goto badframe;
> -
> -    for(i = 0; i < TARGET_NSIG_WORDS; i++) {
> -        __get_user(target_set.sig[i], &frame->sf_mask.sig[i]);
> -    }
> -
> -    target_to_host_sigset_internal(&blocked, &target_set);
> -    set_sigmask(&blocked);
> -
> -    restore_sigcontext(regs, &frame->sf_sc);
> -
> -#if 0
> -    /*
> -     * Don't let your children do this ...
> -     */
> -    __asm__ __volatile__(
> -     "move\t$29, %0\n\t"
> -     "j\tsyscall_exit"
> -     :/* no outputs */
> -     :"r" (&regs));
> -    /* Unreached */
> -#endif
> -
> -    regs->active_tc.PC = regs->CP0_EPC;
> -    mips_set_hflags_isa_mode_from_pc(regs);
> -    /* I am not sure this is right, but it seems to work
> -    * maybe a problem with nested signals ? */
> -    regs->CP0_EPC = 0;
> -    return -TARGET_QEMU_ESIGRETURN;
> -
> -badframe:
> -    force_sig(TARGET_SIGSEGV);
> -    return -TARGET_QEMU_ESIGRETURN;
> -}
> -# endif /* O32 */
> -
> -static void setup_rt_frame(int sig, struct target_sigaction *ka,
> -                           target_siginfo_t *info,
> -                           target_sigset_t *set, CPUMIPSState *env)
> -{
> -    struct target_rt_sigframe *frame;
> -    abi_ulong frame_addr;
> -    int i;
> -
> -    frame_addr = get_sigframe(ka, env, sizeof(*frame));
> -    trace_user_setup_rt_frame(env, frame_addr);
> -    if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) {
> -        goto give_sigsegv;
> -    }
> -
> -    install_sigtramp(frame->rs_code, TARGET_NR_rt_sigreturn);
> -
> -    tswap_siginfo(&frame->rs_info, info);
> -
> -    __put_user(0, &frame->rs_uc.tuc_flags);
> -    __put_user(0, &frame->rs_uc.tuc_link);
> -    __put_user(target_sigaltstack_used.ss_sp, &frame->rs_uc.tuc_stack.ss_sp);
> -    __put_user(target_sigaltstack_used.ss_size, 
> &frame->rs_uc.tuc_stack.ss_size);
> -    __put_user(sas_ss_flags(get_sp_from_cpustate(env)),
> -               &frame->rs_uc.tuc_stack.ss_flags);
> -
> -    setup_sigcontext(env, &frame->rs_uc.tuc_mcontext);
> -
> -    for(i = 0; i < TARGET_NSIG_WORDS; i++) {
> -        __put_user(set->sig[i], &frame->rs_uc.tuc_sigmask.sig[i]);
> -    }
> -
> -    /*
> -    * Arguments to signal handler:
> -    *
> -    *   a0 = signal number
> -    *   a1 = pointer to siginfo_t
> -    *   a2 = pointer to ucontext_t
> -    *
> -    * $25 and PC point to the signal handler, $29 points to the
> -    * struct sigframe.
> -    */
> -    env->active_tc.gpr[ 4] = sig;
> -    env->active_tc.gpr[ 5] = frame_addr
> -                             + offsetof(struct target_rt_sigframe, rs_info);
> -    env->active_tc.gpr[ 6] = frame_addr
> -                             + offsetof(struct target_rt_sigframe, rs_uc);
> -    env->active_tc.gpr[29] = frame_addr;
> -    env->active_tc.gpr[31] = frame_addr
> -                             + offsetof(struct target_rt_sigframe, rs_code);
> -    /* The original kernel code sets CP0_EPC to the handler
> -    * since it returns to userland using eret
> -    * we cannot do this here, and we must set PC directly */
> -    env->active_tc.PC = env->active_tc.gpr[25] = ka->_sa_handler;
> -    mips_set_hflags_isa_mode_from_pc(env);
> -    unlock_user_struct(frame, frame_addr, 1);
> -    return;
> -
> -give_sigsegv:
> -    unlock_user_struct(frame, frame_addr, 1);
> -    force_sigsegv(sig);
> -}
> -
> -long do_rt_sigreturn(CPUMIPSState *env)
> -{
> -    struct target_rt_sigframe *frame;
> -    abi_ulong frame_addr;
> -    sigset_t blocked;
> -
> -    frame_addr = env->active_tc.gpr[29];
> -    trace_user_do_rt_sigreturn(env, frame_addr);
> -    if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) {
> -        goto badframe;
> -    }
> -
> -    target_to_host_sigset(&blocked, &frame->rs_uc.tuc_sigmask);
> -    set_sigmask(&blocked);
> -
> -    restore_sigcontext(env, &frame->rs_uc.tuc_mcontext);
> -
> -    if (do_sigaltstack(frame_addr +
> -                       offsetof(struct target_rt_sigframe, rs_uc.tuc_stack),
> -                       0, get_sp_from_cpustate(env)) == -EFAULT)
> -        goto badframe;
> -
> -    env->active_tc.PC = env->CP0_EPC;
> -    mips_set_hflags_isa_mode_from_pc(env);
> -    /* I am not sure this is right, but it seems to work
> -    * maybe a problem with nested signals ? */
> -    env->CP0_EPC = 0;
> -    return -TARGET_QEMU_ESIGRETURN;
> -
> -badframe:
> -    force_sig(TARGET_SIGSEGV);
> -    return -TARGET_QEMU_ESIGRETURN;
> -}
> -
> -#elif defined(TARGET_PPC)
> +#if defined(TARGET_PPC)
>  
>  /* Size of dummy stack frame allocated when calling signal handler.
>     See arch/powerpc/include/asm/ptrace.h.  */
>