/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include "lint.h"
#include "thr_uberdata.h"
#include <procfs.h>
#include <setjmp.h>
#include <sys/fsr.h>
#include "sigjmp_struct.h"

extern int getlwpstatus(thread_t, lwpstatus_t *);
extern int putlwpregs(thread_t, prgregset_t);

/* ARGSUSED2 */
void *
setup_top_frame(void *stk, size_t stksize, ulwp_t *ulwp)
{
        uintptr_t stack;
        char frame[SA(MINFRAME)];

        /*
         * Top-of-stack must be rounded down to STACK_ALIGN and
         * there must be a minimum frame for the register window.
         */
        stack = (((uintptr_t)stk + stksize) & ~(STACK_ALIGN - 1)) -
            SA(MINFRAME);

        /*
         * This will return NULL if the kernel cannot allocate
         * a page for the top page of the stack.  This will cause
         * thr_create(), pthread_create() or pthread_attr_setstack()
         * to fail, passing the problem up to the application.
         */
        (void) memset(frame, 0, sizeof (frame));
        if (uucopy(frame, (void *)stack, sizeof (frame)) == 0)
                return ((void *)stack);
        return (NULL);
}

int
setup_context(ucontext_t *ucp, void *(*func)(ulwp_t *),
    ulwp_t *ulwp, caddr_t stk, size_t stksize)
{
        uintptr_t stack;

        /* clear the context */
        (void) memset(ucp, 0, sizeof (*ucp));

        /*
         * Clear the top stack frame.
         * If this fails, pass the problem up to the application.
         */
        stack = (uintptr_t)setup_top_frame(stk, stksize, ulwp);
        if (stack == (uintptr_t)NULL)
                return (ENOMEM);

        /* fill in registers of interest */
        ucp->uc_flags |= UC_CPU;
        ucp->uc_mcontext.gregs[REG_PC] = (greg_t)func;
        ucp->uc_mcontext.gregs[REG_nPC] = (greg_t)func + 4;
        ucp->uc_mcontext.gregs[REG_O0] = (greg_t)ulwp;
        ucp->uc_mcontext.gregs[REG_SP] = (greg_t)(stack - STACK_BIAS);
        ucp->uc_mcontext.gregs[REG_O7] = (greg_t)_lwp_start;
        ucp->uc_mcontext.gregs[REG_G7] = (greg_t)ulwp;

        return (0);
}

/*
 * Machine-dependent startup code for a newly-created thread.
 */
void *
_thrp_setup(ulwp_t *self)
{
        extern void _setfsr(greg_t *);

        if (self->ul_fpuenv.fpu_en)
                _setfsr(&self->ul_fpuenv.fsr);

        self->ul_ustack.ss_sp = (void *)(self->ul_stktop - self->ul_stksiz);
        self->ul_ustack.ss_size = self->ul_stksiz;
        self->ul_ustack.ss_flags = 0;
        (void) setustack(&self->ul_ustack);

        update_sched(self);
        tls_setup();

        /* signals have been deferred until now */
        sigon(self);

        if (self->ul_cancel_pending == 2 && !self->ul_cancel_disabled)
                return (NULL);  /* cancelled by pthread_create() */
        return (self->ul_startpc(self->ul_startarg));
}

void
_fpinherit(ulwp_t *ulwp)
{
        extern void _getfsr(greg_t *);
        int fpu_enabled;

#ifdef __sparcv9
        extern greg_t _getfprs();
        fpu_enabled = _getfprs() & FPRS_FEF;
#else
        extern psw_t _getpsr();
        fpu_enabled = _getpsr() & PSR_EF;
#endif /* __sparcv9 */

        if (fpu_enabled) {
                _getfsr(&ulwp->ul_fpuenv.fsr);
                ulwp->ul_fpuenv.fpu_en = 1;
        } else {
                ulwp->ul_fpuenv.fpu_en = 0;
        }
}

void
getgregs(ulwp_t *ulwp, gregset_t rs)
{
        lwpstatus_t status;

        if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
                rs[REG_PC] = status.pr_reg[R_PC];
                rs[REG_O6] = status.pr_reg[R_O6];
                rs[REG_O7] = status.pr_reg[R_O7];
                rs[REG_G1] = status.pr_reg[R_G1];
                rs[REG_G2] = status.pr_reg[R_G2];
                rs[REG_G3] = status.pr_reg[R_G3];
                rs[REG_G4] = status.pr_reg[R_G4];
        } else {
                rs[REG_PC] = 0;
                rs[REG_O6] = 0;
                rs[REG_O7] = 0;
                rs[REG_G1] = 0;
                rs[REG_G2] = 0;
                rs[REG_G3] = 0;
                rs[REG_G4] = 0;
        }
}

void
setgregs(ulwp_t *ulwp, gregset_t rs)
{
        lwpstatus_t status;

        if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
                status.pr_reg[R_PC] = rs[REG_PC];
                status.pr_reg[R_O6] = rs[REG_O6];
                status.pr_reg[R_O7] = rs[REG_O7];
                status.pr_reg[R_G1] = rs[REG_G1];
                status.pr_reg[R_G2] = rs[REG_G2];
                status.pr_reg[R_G3] = rs[REG_G3];
                status.pr_reg[R_G4] = rs[REG_G4];
                (void) putlwpregs(ulwp->ul_lwpid, status.pr_reg);
        }
}

int
__csigsetjmp(sigjmp_buf env, int savemask)
{
        sigjmp_struct_t *bp = (sigjmp_struct_t *)env;
        ulwp_t *self = curthread;

        /*
         * bp->sjs_sp, bp->sjs_pc, bp->sjs_fp and bp->sjs_i7 are already set.
         * Also, if we are running in 64-bit mode (__sparcv9),
         * then bp->sjs_asi and bp->sjs_fprs are already set.
         */
        bp->sjs_flags = JB_FRAMEPTR;
        bp->sjs_uclink = self->ul_siglink;
        if (self->ul_ustack.ss_flags & SS_ONSTACK)
                bp->sjs_stack = self->ul_ustack;
        else {
                bp->sjs_stack.ss_sp =
                    (void *)(self->ul_stktop - self->ul_stksiz);
                bp->sjs_stack.ss_size = self->ul_stksiz;
                bp->sjs_stack.ss_flags = 0;
        }
        if (savemask) {
                bp->sjs_flags |= JB_SAVEMASK;
                enter_critical(self);
                bp->sjs_sigmask = self->ul_sigmask;
                exit_critical(self);
        }

        return (0);
}