Expand PMF_FN_* macros.

[netbsd-mini2440.git] / sys / compat / irix / irix_signal.c

/*      $NetBSD: irix_signal.c,v 1.52 2009/11/23 00:46:06 rmind Exp $ */

/*-
 * Copyright (c) 1994, 2001-2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas and Emmanuel Dreyfus.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: irix_signal.c,v 1.52 2009/11/23 00:46:06 rmind Exp $");

#include <sys/types.h>
#include <sys/signal.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/pool.h>
#include <sys/ptrace.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/wait.h>

#include <machine/regnum.h>
#include <machine/trap.h>

#include <compat/common/compat_util.h>

#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_wait.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_lwp.h>
#include <compat/svr4/svr4_ucontext.h>
#include <compat/svr4/svr4_syscallargs.h>

#include <compat/irix/irix_signal.h>
#include <compat/irix/irix_errno.h>
#include <compat/irix/irix_exec.h>
#include <compat/irix/irix_syscallargs.h>

extern const int native_to_svr4_signo[];
extern const int svr4_to_native_signo[];

static int irix_wait_siginfo(int, struct rusage *, int,
    struct irix_irix5_siginfo *);
static void irix_signal_siginfo(struct irix_irix5_siginfo *,
    int, u_long, void *);
static void irix_set_ucontext(struct irix_ucontext*, const sigset_t *,
    int, struct lwp *);
static void irix_set_sigcontext(struct irix_sigcontext*, const sigset_t *,
    int, struct lwp *);
static void irix_get_ucontext(struct irix_ucontext*, struct lwp *);
static void irix_get_sigcontext(struct irix_sigcontext*, struct lwp *);

#define irix_sigmask(n)  (1 << (((n) - 1) & 31))
#define irix_sigword(n)  (((n) - 1) >> 5)
#define irix_sigemptyset(s)     memset((s), 0, sizeof(*(s)))
#define irix_sigismember(s, n)  ((s)->bits[irix_sigword(n)] & irix_sigmask(n))
#define irix_sigaddset(s, n)    ((s)->bits[irix_sigword(n)] |= irix_sigmask(n))

/*
 * Build a struct siginfo wor waitsys/waitid
 * This is ripped from svr4_setinfo. See irix_sys_waitsys...
 */
static int
irix_wait_siginfo(int pid, struct rusage *ru, int st, struct irix_irix5_siginfo *s)
{
        struct irix_irix5_siginfo i;
        int sig;

        memset(&i, 0, sizeof(i));

        i.isi_signo = SVR4_SIGCHLD;
        i.isi_errno = 0; /* XXX? */

        i.isi_pid = pid;
        if (pid != 0) {
                i.isi_stime = ru->ru_stime.tv_sec;
                i.isi_utime = ru->ru_utime.tv_sec;
        }

        if (WIFEXITED(st)) {
                i.isi_status = WEXITSTATUS(st);
                i.isi_code = SVR4_CLD_EXITED;
        } else if (WIFSTOPPED(st)) {
                sig = WSTOPSIG(st);
                if (sig >= 0 && sig < NSIG)
                        i.isi_status = native_to_svr4_signo[sig];

                if (i.isi_status == SVR4_SIGCONT)
                        i.isi_code = SVR4_CLD_CONTINUED;
                else
                        i.isi_code = SVR4_CLD_STOPPED;
        } else {
                sig = WTERMSIG(st);
                if (sig >= 0 && sig < NSIG)
                        i.isi_status = native_to_svr4_signo[sig];

                if (WCOREDUMP(st))
                        i.isi_code = SVR4_CLD_DUMPED;
                else
                        i.isi_code = SVR4_CLD_KILLED;
        }

        return copyout(&i, s, sizeof(i));
}

/*
 * Build a struct siginfo for signal delivery
 */
static void
irix_signal_siginfo(struct irix_irix5_siginfo *isi, int sig, u_long code, void *addr)
{
        if (sig < 0 || sig >= SVR4_NSIG) {
                isi->isi_errno = IRIX_EINVAL;
                return;
        }
        isi->isi_signo = native_to_svr4_signo[sig];
        isi->isi_errno = 0;
        isi->isi_addr = (intptr_t)addr;

        switch (code) {
        case T_TLB_MOD:
        case T_TLB_LD_MISS:
        case T_TLB_ST_MISS:
                switch (sig) {
                case SIGSEGV:
                        isi->isi_code = IRIX_SEGV_MAPERR;
                        isi->isi_errno = IRIX_EFAULT;
                        break;
                case SIGBUS:
                        isi->isi_code = IRIX_BUS_ADRERR;
                        isi->isi_errno = IRIX_EACCES;
                        break;
                case SIGKILL:
                        isi->isi_code = IRIX_SEGV_MAPERR;
                        isi->isi_errno = IRIX_ENOMEM;
                        break;
                default:
                        isi->isi_code = 0;
                }
                break;

        case T_ADDR_ERR_LD:
        case T_ADDR_ERR_ST:
        case T_BUS_ERR_IFETCH:
        case T_BUS_ERR_LD_ST:
                /* NetBSD issues a SIGSEGV here, IRIX rather uses SIGBUS */
                isi->isi_code = IRIX_SEGV_MAPERR;
                isi->isi_errno = IRIX_EFAULT;
                break;

        case T_BREAK:
                isi->isi_code = IRIX_TRAP_BRKPT;
                break;

        case T_RES_INST:
        case T_COP_UNUSABLE:
                /* NetBSD issues SIGSEGV here, IRIX rather uses SIGILL */
                isi->isi_code = IRIX_SEGV_MAPERR;
                isi->isi_errno = IRIX_EFAULT;
                break;

        case T_OVFLOW:
                isi->isi_errno = IRIX_EOVERFLOW;
        case T_TRAP:
                isi->isi_code = IRIX_FPE_INTOVF;
                break;

        case T_FPE:
                isi->isi_code = IRIX_FPE_FLTINV;
                break;

        case T_WATCH:
        case T_VCEI:
        case T_VCED:
        case T_INT:
        case T_SYSCALL:
        default:
                isi->isi_code = 0;
#ifdef DEBUG_IRIX
                printf("irix_signal_siginfo: sig %d code %ld\n", sig, code);
#endif
                break;
        }
}

void
native_to_irix_sigset(const sigset_t *bss, irix_sigset_t *sss)
{
         int i, newsig;

         irix_sigemptyset(sss);
         for (i = 1; i < NSIG; i++) {
                 if (sigismember(bss, i)) {
                         newsig = native_to_svr4_signo[i];
                         if (newsig)
                                irix_sigaddset(sss, newsig);
                 }
         }
}

void
irix_to_native_sigset(const irix_sigset_t *sss, sigset_t *bss)
{
        int i, newsig;

        sigemptyset(bss);
        for (i = 1; i < SVR4_NSIG; i++) {
                if (irix_sigismember(sss, i)) {
                        newsig = svr4_to_native_signo[i];
                        if (newsig)
                                sigaddset(bss, newsig);
                }
        }
}

void
irix_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
{
        struct lwp *l = curlwp;
        struct proc *p = l->l_proc;
        void *sp;
        struct frame *f = l->l_md.md_regs;
        int onstack;
        int error;
        sig_t catcher = SIGACTION(p, ksi->ksi_signo).sa_handler;
        struct irix_sigframe sf;

#ifdef DEBUG_IRIX
        printf("irix_sendsig()\n");
        printf("catcher = %p, sig = %d, code = 0x%x\n",
            (void *)catcher, ksi->ksi_signo, ksi->ksi_trap);
        printf("irix_sendsig(): starting [PC=0x%#"PRIxREGISTER
            " SP=%#"PRIxREGISTER" SR=0x%08lx]\n",
            f->f_regs[_R_PC], f->f_regs[_R_SP], f->f_regs[_R_SR]);
#endif /* DEBUG_IRIX */

        /*
         * Do we need to jump onto the signal stack?
         */
        onstack =
            (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0
                && (SIGACTION(p, ksi->ksi_signo).sa_flags & SA_ONSTACK) != 0;
#ifdef DEBUG_IRIX
        if (onstack)
                printf("irix_sendsig: using signal stack\n");
#endif
        /*
         * Allocate space for the signal handler context.
         */
        if (onstack)
                sp = (void *)((char *)l->l_sigstk.ss_sp
                    + l->l_sigstk.ss_size);
        else
                /* cast for O64 case */
                sp = (void *)(intptr_t)f->f_regs[_R_SP];

        /*
         * Build the signal frame
         */
        memset(&sf, 0, sizeof(sf));
        if (SIGACTION(p, ksi->ksi_signo).sa_flags & SA_SIGINFO) {
                irix_set_ucontext(&sf.isf_ctx.iss.iuc, mask, ksi->ksi_trap, l);
                irix_signal_siginfo(&sf.isf_ctx.iss.iis, ksi->ksi_signo,
                    ksi->ksi_trap, (void *)f->f_regs[_R_BADVADDR]);
        } else {
                irix_set_sigcontext(&sf.isf_ctx.isc, mask, ksi->ksi_trap, l);
        }

        /*
         * Compute the new stack address after copying sigframe
         */
        sp = (void *)((intptr_t)sp - sizeof(sf.isf_ctx));
        sp = (void *)((intptr_t)sp & ~0xfUL); /* 16 bytes alignement */

        /*
         * Install the sigframe onto the stack
         */
        sendsig_reset(l, ksi->ksi_signo);
        mutex_exit(p->p_lock);
        error = copyout(&sf.isf_ctx, sp, sizeof(sf.isf_ctx));
        mutex_enter(p->p_lock);

        if (error != 0) {
                /*
                 * Process has trashed its stack; give it an illegal
                 * instruction to halt it in its tracks.
                 */
#ifdef DEBUG_IRIX
                printf("irix_sendsig: stack trashed\n");
#endif /* DEBUG_IRIX */
                sigexit(l, SIGILL);
                /* NOTREACHED */
        }


        /*
         * Set up signal trampoline arguments.
         */
        f->f_regs[_R_A0] = native_to_svr4_signo[ksi->ksi_signo];/* signo */
        f->f_regs[_R_A1] = 0;                   /* NULL */
        f->f_regs[_R_A2] = (intptr_t)sp;        /* ucontext/sigcontext */
        f->f_regs[_R_A3] = (intptr_t)catcher;   /* signal handler address */

        /*
         * When siginfo is selected, the higher bit of A0 is set
         * This is how the signal trampoline is able to discover if A2
         * points to a struct irix_sigcontext or struct irix_ucontext.
         * Also, A1 points to struct siginfo instead of being NULL.
         */
        if (SIGACTION(p, ksi->ksi_signo).sa_flags & SA_SIGINFO) {
                f->f_regs[_R_A0] |= 0x80000000;
                f->f_regs[_R_A1] = (intptr_t)sp +
                    ((intptr_t)&sf.isf_ctx.iss.iis - (intptr_t)&sf);
        }

        /*
         * Set up the new stack pointer
         */
        f->f_regs[_R_SP] = (intptr_t)sp;
#ifdef DEBUG_IRIX
        printf("stack pointer at %p, A1 = %p\n", sp, (void *)f->f_regs[_R_A1]);
#endif /* DEBUG_IRIX */

        /*
         * Set up the registers to jump to the signal trampoline
         * on return to userland.
         * see irix_sys_sigaction for details about how we get
         * the signal trampoline address.
         */
        f->f_regs[_R_PC] = (intptr_t)
            (((struct irix_emuldata *)(p->p_emuldata))->ied_sigtramp[ksi->ksi_signo]);

        /*
         * Remember that we're now on the signal stack.
         */
        if (onstack)
                l->l_sigstk.ss_flags |= SS_ONSTACK;

#ifdef DEBUG_IRIX
        printf("returning from irix_sendsig()\n");
#endif
}

static void
irix_set_sigcontext (struct irix_sigcontext *scp, const sigset_t *mask,
    int code, struct lwp *l)
{
        struct frame *f;
        struct pcb *pcb;
        int i;

        KASSERT(mutex_owned(l->l_proc->p_lock));

#ifdef DEBUG_IRIX
        printf("irix_set_sigcontext()\n");
#endif
        f = (struct frame *)l->l_md.md_regs;
        /*
         * Build stack frame for signal trampoline.
         */
        native_to_irix_sigset(mask, &scp->isc_sigset);
        for (i = 1; i < 32; i++) { /* save gpr1 - gpr31 */
                scp->isc_regs[i] = f->f_regs[i];
        }
        scp->isc_regs[0] = 0;
        scp->isc_fp_rounded_result = 0;
        scp->isc_regmask = -2;
        scp->isc_mdhi = f->f_regs[_R_MULHI];
        scp->isc_mdlo = f->f_regs[_R_MULLO];
        scp->isc_pc = f->f_regs[_R_PC];
        scp->isc_badvaddr = f->f_regs[_R_BADVADDR];
        scp->isc_cause = f->f_regs[_R_CAUSE];

        /*
         * Save the floating-pointstate, if necessary, then copy it.
         */
        pcb = lwp_getpcb(l);
#ifndef SOFTFLOAT
        scp->isc_ownedfp = l->l_md.md_flags & MDP_FPUSED;
        if (scp->isc_ownedfp) {
                /* if FPU has current state, save it first */
                if (l == fpcurlwp)
                        savefpregs(l);
                memcpy(&scp->isc_fpregs, &pcb->pcb_fpregs,
                    sizeof(scp->isc_fpregs));
                scp->isc_fpc_csr = pcb->pcb_fpregs.r_regs[32];
        }
#else
        memcpy(&scp->isc_fpregs, &pcb->pcb_fpregs, sizeof(scp->isc_fpregs));
#endif
        /*
         * Save signal stack
         */
        scp->isc_ssflags =
            (l->l_sigstk.ss_flags & SS_ONSTACK) ? IRIX_SS_ONSTACK : 0;

        return;
}

void
irix_set_ucontext(struct irix_ucontext *ucp, const sigset_t *mask,
    int code, struct lwp *l)
{
        struct frame *f;
        struct pcb *pcb;

        KASSERT(mutex_owned(l->l_proc->p_lock));

#ifdef DEBUG_IRIX
        printf("irix_set_ucontext()\n");
#endif

        f = (struct frame *)l->l_md.md_regs;
        /*
         * Save general purpose registers
         */
        native_to_irix_sigset(mask, &ucp->iuc_sigmask);
        memcpy(&ucp->iuc_mcontext.svr4___gregs,
            &f->f_regs, 32 * sizeof(mips_reg_t));
        /* Theses registers have different order on NetBSD and IRIX */
        ucp->iuc_mcontext.svr4___gregs[IRIX_CTX_MDLO] = f->f_regs[_R_MULLO];
        ucp->iuc_mcontext.svr4___gregs[IRIX_CTX_MDHI] = f->f_regs[_R_MULHI];
        ucp->iuc_mcontext.svr4___gregs[IRIX_CTX_EPC] = f->f_regs[_R_PC];
        ucp->iuc_mcontext.svr4___gregs[IRIX_CTX_CAUSE] = f->f_regs[_R_CAUSE];

        /*
         * Save the floating-pointstate, if necessary, then copy it.
         */
        pcb = lwp_getpcb(l);
#ifndef SOFTFLOAT
        if (l->l_md.md_flags & MDP_FPUSED) {
                /* if FPU has current state, save it first */
                if (l == fpcurlwp)
                        savefpregs(l);
                memcpy(&ucp->iuc_mcontext.svr4___fpregs,
                    &pcb->pcb_fpregs, sizeof(ucp->iuc_mcontext.svr4___fpregs));
                ucp->iuc_mcontext.svr4___fpregs.svr4___fp_csr =
                    pcb->pcb_fpregs.r_regs[32];
        }
#else
        memcpy(&ucp->iuc_mcontext.svr4___fpregs,
            &pcb->pcb_fpregs, sizeof(ucp->iuc_mcontext.svr4___fpregs));
#endif
        /*
         * Save signal stack
         */
        ucp->iuc_stack.ss_sp = l->l_sigstk.ss_sp;
        ucp->iuc_stack.ss_size = l->l_sigstk.ss_size;

        if (l->l_sigstk.ss_flags & SS_ONSTACK)
                ucp->iuc_stack.ss_flags |= IRIX_SS_ONSTACK;
        else
                ucp->iuc_stack.ss_flags &= ~IRIX_SS_ONSTACK;

        if (l->l_sigstk.ss_flags & SS_DISABLE)
                ucp->iuc_stack.ss_flags |= IRIX_SS_DISABLE;
        else
                ucp->iuc_stack.ss_flags &= ~IRIX_SS_DISABLE;

        /*
         * Used fields in irix_ucontext: all
         */
        ucp->iuc_flags = IRIX_UC_ALL;

        return;
}

int
irix_sys_sigreturn(struct lwp *l, const struct irix_sys_sigreturn_args *uap, register_t *retval)
{
        /* {
                syscallarg(struct irix_sigcontext *) scp;
                syscallarg(struct irix_ucontext *) ucp;
                syscallarg(int) signo;
        } */
        void *usf;
        struct irix_sigframe ksf;
        struct proc *p = l->l_proc;
        int error;

#ifdef DEBUG_IRIX
        printf("irix_sys_sigreturn()\n");
        printf("scp = %p, ucp = %p, sig = %d\n",
            (void *)SCARG(uap, scp), (void *)SCARG(uap, ucp),
            SCARG(uap, signo));
#endif /* DEBUG_IRIX */

        /*
         * The trampoline code hands us the context.
         * It is unsafe to keep track of it ourselves, in the event that a
         * program jumps out of a signal handler.
         */
        usf = (void *)SCARG(uap, scp);
        if (usf == NULL) {
                usf = (void *)SCARG(uap, ucp);

                if ((error = copyin(usf, &ksf.isf_ctx.iss.iuc,
                    sizeof(ksf.isf_ctx))) != 0)
                        return error;
        
                mutex_enter(p->p_lock);
                irix_get_ucontext(&ksf.isf_ctx.iss.iuc, l);
                mutex_exit(p->p_lock);
        } else {
                if ((error = copyin(usf, &ksf.isf_ctx.isc,
                    sizeof(ksf.isf_ctx))) != 0)
                        return error;

                mutex_enter(p->p_lock);
                irix_get_sigcontext(&ksf.isf_ctx.isc, l);
                mutex_exit(p->p_lock);
        }

#ifdef DEBUG_IRIX
        printf("irix_sys_sigreturn(): returning [PC=%p SP=%p SR=0x%08lx]\n",
            (void *)((struct frame *)(l->l_md.md_regs))->f_regs[_R_PC],
            (void *)((struct frame *)(l->l_md.md_regs))->f_regs[_R_SP],
            ((struct frame *)(l->l_md.md_regs))->f_regs[_R_SR]);
#endif

        return EJUSTRETURN;
}

static void
irix_get_ucontext(struct irix_ucontext *ucp, struct lwp *l)
{
        struct frame *f;
        sigset_t mask;

        KASSERT(mutex_owned(l->l_proc->p_lock));

        /* Restore the register context. */
        f = (struct frame *)l->l_md.md_regs;

        if (ucp->iuc_flags & IRIX_UC_CPU) {
                (void)memcpy(&f->f_regs, &ucp->iuc_mcontext.svr4___gregs,
                    32 * sizeof(mips_reg_t));
                /* Theses registers have different order on NetBSD and IRIX */
                f->f_regs[_R_MULLO] =
                    ucp->iuc_mcontext.svr4___gregs[IRIX_CTX_MDLO];
                f->f_regs[_R_MULHI] =
                    ucp->iuc_mcontext.svr4___gregs[IRIX_CTX_MDHI];
                f->f_regs[_R_PC] =
                    ucp->iuc_mcontext.svr4___gregs[IRIX_CTX_EPC];
        }

        if (ucp->iuc_flags & IRIX_UC_MAU) {
                struct pcb *pcb = lwp_getpcb(l);
#ifndef SOFTFLOAT
                /* Disable the FPU to fault in FP registers. */
                f->f_regs[_R_SR] &= ~MIPS_SR_COP_1_BIT;
                if (l == fpcurlwp)
                        fpcurlwp = NULL;
                memcpy(&pcb->pcb_fpregs, &ucp->iuc_mcontext.svr4___fpregs,
                    sizeof(pcb->pcb_fpregs));
                pcb->pcb_fpregs.r_regs[32] =
                     ucp->iuc_mcontext.svr4___fpregs.svr4___fp_csr;
#else
                memcpy(&pcb->pcb_fpregs, &ucp->iuc_mcontext.svr4___fpregs,
                    sizeof(pcb->pcb_fpregs));
#endif
        }

        /*
         * Restore stack
         */
        if (ucp->iuc_flags & IRIX_UC_STACK) {
                l->l_sigstk.ss_sp = ucp->iuc_stack.ss_sp;
                l->l_sigstk.ss_size = ucp->iuc_stack.ss_size;

                if (ucp->iuc_stack.ss_flags & IRIX_SS_ONSTACK)
                        l->l_sigstk.ss_flags |= SS_ONSTACK;
                else
                        l->l_sigstk.ss_flags &= ~SS_ONSTACK;

                if (ucp->iuc_stack.ss_flags & IRIX_SS_DISABLE)
                        l->l_sigstk.ss_flags |= IRIX_SS_DISABLE;
                else
                        l->l_sigstk.ss_flags &= ~IRIX_SS_DISABLE;
        }

        /*
         * Restore signal mask
         */
        if (ucp->iuc_flags & IRIX_UC_SIGMASK) {
                /* Restore signal mask. */
                irix_to_native_sigset(&ucp->iuc_sigmask, &mask);
                (void)sigprocmask1(l, SIG_SETMASK, &mask, 0);
        }

        return;
}

static void
irix_get_sigcontext(struct irix_sigcontext *scp, struct lwp *l)
{
        struct frame *f;
        struct pcb *pcb;
        sigset_t mask;
        int i;

        KASSERT(mutex_owned(l->l_proc->p_lock));

        /* Restore the register context. */
        f = (struct frame *)l->l_md.md_regs;

        for (i = 1; i < 32; i++) /* restore gpr1 to gpr31 */
                f->f_regs[i] = scp->isc_regs[i];
        f->f_regs[_R_MULLO] = scp->isc_mdlo;
        f->f_regs[_R_MULHI] = scp->isc_mdhi;
        f->f_regs[_R_PC] = scp->isc_pc;

        pcb = lwp_getpcb(l);
#ifndef SOFTFLOAT
        if (scp->isc_ownedfp) {
                /* Disable the FPU to fault in FP registers. */
                f->f_regs[_R_SR] &= ~MIPS_SR_COP_1_BIT;
                if (l == fpcurlwp)
                        fpcurlwp = NULL;
                memcpy(&pcb->pcb_fpregs, &scp->isc_fpregs,
                    sizeof(scp->isc_fpregs));
                pcb->pcb_fpregs.r_regs[32] = scp->isc_fpc_csr;
        }
#else
        memcpy(&pcb->pcb_fpregs, &scp->isc_fpregs, sizeof(pcb->pcb_fpregs));
#endif

        /* Restore signal stack. */
        if (scp->isc_ssflags & IRIX_SS_ONSTACK)
                l->l_sigstk.ss_flags |= SS_ONSTACK;
        else
                l->l_sigstk.ss_flags &= ~SS_ONSTACK;


        /* Restore signal mask. */
        irix_to_native_sigset(&scp->isc_sigset, &mask);
        (void)sigprocmask1(l, SIG_SETMASK, &mask, 0);

        return;
}


int
irix_sys_sginap(struct lwp *l, const struct irix_sys_sginap_args *uap, register_t *retval)
{
        /* {
                syscallarg(long) ticks;
        } */
        int rticks = SCARG(uap, ticks);
        struct timeval tvb, tve, tvd;
        long long delta;
        int dontcare;

        if (rticks != 0)
                microtime(&tvb);

        if ((tsleep(&dontcare, PZERO|PCATCH, 0, rticks) != 0) &&
            (rticks != 0)) {
                microtime(&tve);
                timersub(&tve, &tvb, &tvd);
                delta = ((tvd.tv_sec * 1000000) + tvd.tv_usec); /* XXX */
                *retval = (register_t)(rticks - (delta / tick));
        }

        return 0;
}

/*
 * XXX Untested. Expect bugs and security problems here
 */
int
irix_sys_getcontext(struct lwp *l, const struct irix_sys_getcontext_args *uap, register_t *retval)
{
        /* {
                syscallarg(struct irix_ucontext *) ucp;
        } */
        struct proc *p = l->l_proc;
        struct frame *f;
        struct irix_ucontext kucp;
        int i, error;

        f = (struct frame *)l->l_md.md_regs;

        kucp.iuc_flags = IRIX_UC_ALL;
        kucp.iuc_link = NULL;           /* XXX */

        mutex_enter(p->p_lock);
        native_to_irix_sigset(&l->l_sigmask, &kucp.iuc_sigmask);
        kucp.iuc_stack.ss_sp = l->l_sigstk.ss_sp;
        kucp.iuc_stack.ss_size = l->l_sigstk.ss_size;
        kucp.iuc_stack.ss_flags = 0;
        if (l->l_sigstk.ss_flags & SS_ONSTACK)
                kucp.iuc_stack.ss_flags &= IRIX_SS_ONSTACK;
        if (l->l_sigstk.ss_flags & SS_DISABLE)
                kucp.iuc_stack.ss_flags &= IRIX_SS_DISABLE;
        mutex_exit(p->p_lock);

        for (i = 0; i < 36; i++) /* Is order correct? */
                kucp.iuc_mcontext.svr4___gregs[i] = f->f_regs[i];
        for (i = 0; i < 32; i++)
                kucp.iuc_mcontext.svr4___fpregs.svr4___fp_r.svr4___fp_regs[i]
                    = 0; /* XXX where are FP registers? */
        for (i = 0; i < 47; i++)
                kucp.iuc_filler[i] = 0; /* XXX */
        kucp.iuc_triggersave = 0;       /* XXX */

        error = copyout(&kucp, SCARG(uap, ucp), sizeof(kucp));

        return error;
}

/*
 * XXX Untested. Expect bugs and security problems here
 */
int
irix_sys_setcontext(struct lwp *l, const struct irix_sys_setcontext_args *uap, register_t *retval)
{
        /* {
                syscallarg(struct irix_ucontext *) ucp;
        } */
        struct proc *p = l->l_proc;
        struct frame *f;
        struct irix_ucontext kucp;
        int i, error;

        error = copyin(SCARG(uap, ucp), &kucp, sizeof(kucp));
        if (error)
                goto out;

        f = (struct frame *)l->l_md.md_regs;

        mutex_enter(p->p_lock);

        if (kucp.iuc_flags & IRIX_UC_SIGMASK)
                irix_to_native_sigset(&kucp.iuc_sigmask,
                    &l->l_sigmask);

        if (kucp.iuc_flags & IRIX_UC_STACK) {
                l->l_sigstk.ss_sp = kucp.iuc_stack.ss_sp;
                l->l_sigstk.ss_size =
                    (unsigned long)kucp.iuc_stack.ss_sp;
                l->l_sigstk.ss_flags = 0;
                if (kucp.iuc_stack.ss_flags & IRIX_SS_ONSTACK)
                        l->l_sigstk.ss_flags &= SS_ONSTACK;
                if (kucp.iuc_stack.ss_flags & IRIX_SS_DISABLE)
                        l->l_sigstk.ss_flags &= SS_DISABLE;
        }

        mutex_exit(p->p_lock);

        if (kucp.iuc_flags & IRIX_UC_CPU)
                for (i = 0; i < 36; i++) /* Is register order right? */
                        f->f_regs[i] = kucp.iuc_mcontext.svr4___gregs[i];

        if (kucp.iuc_flags & IRIX_UC_MAU) { /* XXX */
#ifdef DEBUG_IRIX
        printf("irix_sys_setcontext(): IRIX_UC_MAU requested\n");
#endif
        }

out:
        return error;
}


/*
 * The following code is from svr4_sys_waitsys(), with a few lines added
 * for supporting the rusage argument which is present in the IRIX version
 * and not in the SVR4 version.
 * Both version could be merged by creating a svr4_sys_waitsys1() with the
 * rusage argument, and by calling it with NULL from svr4_sys_waitsys().
 * irix_wait_siginfo is here because 1) svr4_setinfo is static and cannot be
 * used here and 2) because struct irix_irix5_siginfo is quite different
 * from svr4_siginfo. In order to merge, we need to include irix_signal.h
 * from svr4_misc.c, or push the irix_irix5_siginfo into svr4_siginfo.h
 */
int
irix_sys_waitsys(struct lwp *l, const struct irix_sys_waitsys_args *uap,
    register_t *retval)
{
        /* {
                syscallarg(int) type;
                syscallarg(int) pid;
                syscallarg(struct irix_irix5_siginfo *) info;
                syscallarg(int) options;
                syscallarg(struct rusage *) ru;
        } */
        struct proc *parent = l->l_proc;
        int error, status, options, pid;
        struct rusage ru;

        switch (SCARG(uap, type)) {
        case SVR4_P_PID:
                pid = SCARG(uap, pid);
                break;

        case SVR4_P_PGID:
                pid = -parent->p_pgid;
                break;

        case SVR4_P_ALL:
                pid = WAIT_ANY;
                break;

        default:
                return EINVAL;
        }

#ifdef DEBUG_IRIX
        printf("waitsys(%d, %d, %p, %x, %p)\n",
                 SCARG(uap, type), pid,
                 SCARG(uap, info), SCARG(uap, options), SCARG(uap, ru));
#endif

        /* Translate options */
        options = WOPTSCHECKED;
        if (SCARG(uap, options) & SVR4_WNOWAIT)
                options |= WNOWAIT;
        if (SCARG(uap, options) & SVR4_WNOHANG)
                options |= WNOHANG;
        if ((SCARG(uap, options) & (SVR4_WEXITED|SVR4_WTRAPPED)) == 0)
                options |= WNOZOMBIE;
        if (SCARG(uap, options) & (SVR4_WSTOPPED|SVR4_WCONTINUED))
                options |= WUNTRACED;

        error = do_sys_wait(&pid, &status, options, &ru);
        if (error != 0)
                return error;

        if (SCARG(uap, ru)) {
                error = copyout(&ru, SCARG(uap, ru), sizeof(ru));
                if (error != 0)
                        return error;
        }

        return irix_wait_siginfo(pid, &ru, status, SCARG(uap,info));
}

int
irix_sys_sigprocmask(struct lwp *l, const struct irix_sys_sigprocmask_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) how;
                syscallarg(const irix_sigset_t *) set;
                syscallarg(irix_sigset_t *) oset;
        } */
        struct proc *p = l->l_proc;
        struct svr4_sys_sigprocmask_args cup;
        int error;
        sigset_t obss, nbss;
        irix_sigset_t niss, oiss;

        if (SCARG(uap, how) != IRIX_SIG_SETMASK32) {
                SCARG(&cup, how) = SCARG(uap, how);
                SCARG(&cup, set) = (const svr4_sigset_t *)SCARG(uap, set);
                SCARG(&cup, oset) = (svr4_sigset_t *)SCARG(uap, oset);
                return svr4_sys_sigprocmask(l, &cup, retval);
        }

        if ((error = copyin(SCARG(uap, set), &niss, sizeof(niss))) != 0)
                return error;

        /* We must preserve the high bits of the irix sigmask, so mustget them */
        native_to_irix_sigset(&l->l_sigmask, &oiss);
        /* The irix bitmask is 128 bits, I think we only have the bottom 32 */
        niss.bits[1] = oiss.bits[1];
        niss.bits[2] = oiss.bits[2];
        niss.bits[3] = oiss.bits[3];
        /* We now need the corresponding netbsd mask */
        irix_to_native_sigset(&niss, &nbss);

        mutex_enter(p->p_lock);
        error = sigprocmask1(l, SIG_SETMASK, &nbss, &obss);
        mutex_exit(p->p_lock);

        if (error != 0 || SCARG(&cup, oset) == NULL)
                return error;

        native_to_irix_sigset(&obss, &oiss);

        /* XXX: should this copyout only be 4 bytes ? */
        return copyout(&oiss, SCARG(&cup, oset), sizeof(oiss));
}

int
irix_sys_sigaction(struct lwp *l, const struct irix_sys_sigaction_args *uap, register_t *retval)
{
        /* {
                syscallarg(int) signum;
                syscallarg(const struct svr4_sigaction *) nsa;
                syscallarg(struct svr4_sigaction *) osa;
                syscallarg(void *) sigtramp;
        } */
        struct proc *p = l->l_proc;
        int signum;
        struct svr4_sys_sigaction_args cup;
        struct irix_emuldata *ied;
#ifdef DEBUG_IRIX
        void *sigtramp;
#endif

        /*
         * On IRIX, the sigaction() system call has a fourth argument, which
         * is a pointer to the signal trampoline code. The kernel does not
         * seems to provide a signal trampoline, the user process has to
         * embed it. Of course, the sigaction() stub in libc only has three
         * argument. The fourth argument to the system call is filled by the
         * libc.
         *
         * The signal trampoline does the following job:
         *   - holds extra bytes on the stack (48 on IRIX 6, 24 on IRIX 5)
         *     for the signal frame. See struct irix_sigframe in irix_signal.h
         *     for the details of the signal frame fields for IRIX 6.
         *   - checks if the higher bit of a0 is set (the kernel sets this
         *     when SA_SIGINFO is set)
         *   - if so, stores in a2 sf.isf_ucp, and NULL in sf.isf_scp
         *     SA_SIGACTION is set, we are using a struct irix_ucontext in a2
         *   - if not, stores a2 in sf.isf_scp. Here SA_SIGACTION is clear
         *     and we are using a struct irix_sigcontext in a2.
         *   - finds the address of errno, and stores it in sf.isf_uep (IRIX 6
         *     only). This is done by looking up the Global Offset Table and
         *     assuming that the errnoaddr symbol is at a fixed offset from
         *     the signal trampoline.
         *   - invoke the signal handler
         *   - sets errno using sf.isf_uep and sf.isf_errno (IRIX 6 only)
         *   - calls sigreturn(sf.isf_scp, sf.isf_ucp, sf.isf_signo) on IRIX 6
         *     and sigreturn(sf.isf_scp, sf.isf_ucp) on IRIX 5.  Note that if
         *     SA_SIGINFO was set, then the higher bit of sf.isf_signo is
         *     still set.
         *
         * The signal trampoline is hence saved in the p_emuldata field
         * of struct proc, in an array (one element for each signal)
         */
        signum = SCARG(uap, signum);
        if (signum < 0 || signum >= SVR4_NSIG)
                return EINVAL;
        signum = svr4_to_native_signo[signum];
        ied = (struct irix_emuldata *)(p->p_emuldata);

#ifdef DEBUG_IRIX
        sigtramp = ied->ied_sigtramp[signum];

        if (sigtramp != NULL && sigtramp != SCARG(uap, sigtramp))
                printf("Warning: sigtramp changed from %p to %p for sig. %d\n",
                        sigtramp, SCARG(uap, sigtramp), signum);
#endif

        ied->ied_sigtramp[signum] = SCARG(uap, sigtramp);

        SCARG(&cup, signum) = signum;
        SCARG(&cup, nsa) = SCARG(uap, nsa);
        SCARG(&cup, osa) = SCARG(uap, osa);

        return svr4_sys_sigaction(l, &cup, retval);
}