 @@ -1,519 +1,513 @@
-/*	$NetBSD: linux_machdep.c,v 1.50 2014/11/09 17:48:07 maxv Exp $	*/
+/*	$NetBSD: linux_machdep.c,v 1.51 2020/09/03 14:26:31 thorpej Exp $	*/
 /*-
  * Copyright (c) 1998 The NetBSD Foundation, Inc.
  * All rights reserved.
+ *
  * This code is derived from software contributed to The NetBSD Foundation
  * by Eric Haszlakiewicz.
+ *
  * 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.
+ *
  * Based on sys/arch/i386/i386/linux_machdep.c:
  *	linux_machdep.c,v 1.42 1998/09/11 12:50:06 mycroft Exp
  *	written by Frank van der Linden
+ *
  */
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.50 2014/11/09 17:48:07 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.51 2020/09/03 14:26:31 thorpej Exp $");
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/signalvar.h>
 #include <sys/kernel.h>
 #include <sys/proc.h>
 #include <sys/buf.h>
 #include <sys/reboot.h>
 #include <sys/conf.h>
 #include <sys/exec.h>
 #include <sys/file.h>
 #include <sys/callout.h>
 #include <sys/mbuf.h>
 #include <sys/msgbuf.h>
 #include <sys/mount.h>
 #include <sys/vnode.h>
 #include <sys/device.h>
 #include <sys/syscallargs.h>
 #include <sys/filedesc.h>
 #include <sys/exec_elf.h>
 #include <sys/ioctl.h>
 #include <sys/kauth.h>
 #include <uvm/uvm_extern.h>
 #include <compat/linux/common/linux_types.h>
 #include <compat/linux/common/linux_signal.h>
 #include <compat/linux/common/linux_siginfo.h>
 #include <compat/linux/common/linux_util.h>
 #include <compat/linux/common/linux_ioctl.h>
 #include <compat/linux/common/linux_exec.h>
 #include <compat/linux/common/linux_machdep.h>
 #include <compat/linux/common/linux_emuldata.h>
 #include <compat/linux/linux_syscallargs.h>
 #include <machine/alpha.h>
 #include <machine/reg.h>
 #if defined(_KERNEL_OPT)
 #include "wsdisplay.h"
 #endif
 #if (NWSDISPLAY >0)
 #include <dev/wscons/wsdisplay_usl_io.h>
 #endif
 #ifdef DEBUG
 #include <machine/sigdebug.h>
 #endif
 /*
  * Deal with some alpha-specific things in the Linux emulation code.
  */
 void
 linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack)
+{
 #ifdef DEBUG
 	struct trapframe *tfp = l->l_md.md_tf;
 #endif
 	setregs(l, epp, stack);
 #ifdef DEBUG
 	/*
 	 * Linux has registers set to zero on entry; for DEBUG kernels
 	 * the alpha setregs() fills registers with 0xbabefacedeadbeef.
 	 */
 	memset(tfp->tf_regs, 0, FRAME_SIZE * sizeof tfp->tf_regs[0]);
 #endif
+}
 void
 setup_linux_rt_sigframe(struct trapframe *tf, const ksiginfo_t *ksi,
     const sigset_t *mask)
+{
 	struct lwp *l = curlwp;
 	struct proc *p = l->l_proc;
 	struct linux_rt_sigframe *sfp, sigframe;
 	int onstack, error;
 	int fsize, rndfsize;
 	int sig = ksi->ksi_signo;
 	extern char linux_rt_sigcode[], linux_rt_esigcode[];
 	/* Do we need to jump onto the signal stack? */
 	onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
 		  (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
 	/* Allocate space for the signal handler context.  */
 	fsize = sizeof(struct linux_rt_sigframe);
 	rndfsize = ((fsize + 15) / 16) * 16;
 	if (onstack)
 		sfp = (struct linux_rt_sigframe *)
 		    ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size);
 	else
 		sfp = (struct linux_rt_sigframe *)(alpha_pal_rdusp());
 	sfp = (struct linux_rt_sigframe *)((char *)sfp - rndfsize);
 #ifdef DEBUG
 	if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid))
 		printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid,
 		    sig, &onstack, sfp);
 #endif /* DEBUG */
 	/*
 	 * Build the signal context to be used by sigreturn.
 	 */
 	memset(&sigframe.uc, 0, sizeof(struct linux_ucontext));
 	sigframe.uc.uc_mcontext.sc_onstack = onstack;
 	/* Setup potentially partial signal mask in sc_mask. */
 	/* But get all of it in uc_sigmask */
 	native_to_linux_old_sigset(&sigframe.uc.uc_mcontext.sc_mask, mask);
 	native_to_linux_sigset(&sigframe.uc.uc_sigmask, mask);
 	sigframe.uc.uc_mcontext.sc_pc = tf->tf_regs[FRAME_PC];
 	sigframe.uc.uc_mcontext.sc_ps = ALPHA_PSL_USERMODE;
 	frametoreg(tf, (struct reg *)sigframe.uc.uc_mcontext.sc_regs);
 	sigframe.uc.uc_mcontext.sc_regs[R_SP] = alpha_pal_rdusp();
 	fpu_load();
 	alpha_pal_wrfen(1);
 	sigframe.uc.uc_mcontext.sc_fpcr = alpha_read_fpcr();
 	sigframe.uc.uc_mcontext.sc_fp_control = alpha_read_fp_c(l);
 	alpha_pal_wrfen(0);
 	sigframe.uc.uc_mcontext.sc_traparg_a0 = tf->tf_regs[FRAME_A0];
 	sigframe.uc.uc_mcontext.sc_traparg_a1 = tf->tf_regs[FRAME_A1];
 	sigframe.uc.uc_mcontext.sc_traparg_a2 = tf->tf_regs[FRAME_A2];
 	native_to_linux_siginfo(&sigframe.info, &ksi->ksi_info);
 	sendsig_reset(l, sig);
 	mutex_exit(p->p_lock);
 	error = copyout((void *)&sigframe, (void *)sfp, fsize);
 	mutex_enter(p->p_lock);
 	if (error != 0) {
 #ifdef DEBUG
 		if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
 			printf("sendsig(%d): copyout failed on sig %d\n",
 			    p->p_pid, sig);
 #endif
 		/*
 		 * Process has trashed its stack; give it an illegal
 		 * instruction to halt it in its tracks.
 		 */
 		sigexit(l, SIGILL);
 		/* NOTREACHED */
+	}
 	/* Pass pointers to siginfo and ucontext in the regs */
 	tf->tf_regs[FRAME_A1] = (unsigned long)&sfp->info;
 	tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->uc;
 	/* Address of trampoline code.  End up at this PC after mi_switch */
 	tf->tf_regs[FRAME_PC] =
 	    (u_int64_t)(p->p_psstrp - (linux_rt_esigcode - linux_rt_sigcode));
 	/* Adjust the stack */
 	alpha_pal_wrusp((unsigned long)sfp);
 	/* Remember that we're now on the signal stack. */
 	if (onstack)
 		l->l_sigstk.ss_flags |= SS_ONSTACK;
+}
 void setup_linux_sigframe(struct trapframe *tf, const ksiginfo_t *ksi,
     const sigset_t *mask)
+{
 	struct lwp *l = curlwp;
 	struct proc *p = l->l_proc;
 	struct linux_sigframe *sfp, sigframe;
 	int onstack, error;
 	int fsize, rndfsize;
 	int sig = ksi->ksi_signo;
 	extern char linux_sigcode[], linux_esigcode[];
 	/* Do we need to jump onto the signal stack? */
 	onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
 		  (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
 	/* Allocate space for the signal handler context.  */
 	fsize = sizeof(struct linux_sigframe);
 	rndfsize = ((fsize + 15) / 16) * 16;
 	if (onstack)
 		sfp = (struct linux_sigframe *)
 		    ((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size);
 	else
 		sfp = (struct linux_sigframe *)(alpha_pal_rdusp());
 	sfp = (struct linux_sigframe *)((char *)sfp - rndfsize);
 #ifdef DEBUG
 	if ((sigdebug & SDB_KSTACK) && (p->p_pid == sigpid))
 		printf("linux_sendsig(%d): sig %d ssp %p usp %p\n", p->p_pid,
 		    sig, &onstack, sfp);
 #endif /* DEBUG */
 	/*
 	 * Build the signal context to be used by sigreturn.
 	 */
 	memset(&sigframe.sf_sc, 0, sizeof(struct linux_sigcontext));
 	sigframe.sf_sc.sc_onstack = onstack;
 	native_to_linux_old_sigset(&sigframe.sf_sc.sc_mask, mask);
 	sigframe.sf_sc.sc_pc = tf->tf_regs[FRAME_PC];
 	sigframe.sf_sc.sc_ps = ALPHA_PSL_USERMODE;
 	frametoreg(tf, (struct reg *)sigframe.sf_sc.sc_regs);
 	sigframe.sf_sc.sc_regs[R_SP] = alpha_pal_rdusp();
-	if (l == fpcurlwp) {
+	if (fpu_valid_p(l)) {
 		struct pcb *pcb = lwp_getpcb(l);
-		alpha_pal_wrfen(1);
+		fpu_save(l);
 		savefpstate(&pcb->pcb_fp);
 		alpha_pal_wrfen(0);
 		sigframe.sf_sc.sc_fpcr = pcb->pcb_fp.fpr_cr;
 		fpcurlwp = NULL;
+	}
 	/* XXX ownedfp ? etc...? */
 	sigframe.sf_sc.sc_traparg_a0 = tf->tf_regs[FRAME_A0];
 	sigframe.sf_sc.sc_traparg_a1 = tf->tf_regs[FRAME_A1];
 	sigframe.sf_sc.sc_traparg_a2 = tf->tf_regs[FRAME_A2];
 	sendsig_reset(l, sig);
 	mutex_exit(p->p_lock);
 	error = copyout((void *)&sigframe, (void *)sfp, fsize);
 	mutex_enter(p->p_lock);
 	if (error != 0) {
 #ifdef DEBUG
 		if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
 			printf("sendsig(%d): copyout failed on sig %d\n",
 			    p->p_pid, sig);
 #endif
 		/*
 		 * Process has trashed its stack; give it an illegal
 		 * instruction to halt it in its tracks.
 		 */
 		sigexit(l, SIGILL);
 		/* NOTREACHED */
+	}
 	/* Pass pointers to sigcontext in the regs */
 	tf->tf_regs[FRAME_A1] = 0;
 	tf->tf_regs[FRAME_A2] = (unsigned long)&sfp->sf_sc;
 	/* Address of trampoline code.  End up at this PC after mi_switch */
 	tf->tf_regs[FRAME_PC] =
 	    (u_int64_t)(p->p_psstrp - (linux_esigcode - linux_sigcode));
 	/* Adjust the stack */
 	alpha_pal_wrusp((unsigned long)sfp);
 	/* Remember that we're now on the signal stack. */
 	if (onstack)
 		l->l_sigstk.ss_flags |= SS_ONSTACK;
+}
 /*
  * Send an interrupt to process.
+ *
  * Stack is set up to allow sigcode stored
  * in u. to call routine, followed by kcall
  * to sigreturn routine below.  After sigreturn
  * resets the signal mask, the stack, and the
  * frame pointer, it returns to the user
  * specified pc, psl.
  */
 void
 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
+{
 	struct lwp *l = curlwp;
 	struct proc *p = l->l_proc;
 	struct trapframe *tf = l->l_md.md_tf;
 	const int sig = ksi->ksi_signo;
 	sig_t catcher = SIGACTION(p, sig).sa_handler;
 #ifdef notyet
 	struct linux_emuldata *edp;
 	/* Setup the signal frame (and part of the trapframe) */
 	/*OLD: if (p->p_sigacts->ps_siginfo & sigmask(sig))*/
 /*	XXX XAX this is broken now.  need someplace to store what
 	XXX XAX kind of signal handler a signal has.*/
 #if 0
 	edp = (struct linux_emuldata *)p->p_emuldata;
 #else
 	edp = 0;
 #endif
 	if (edp && sigismember(&edp->ps_siginfo, sig))
 		setup_linux_rt_sigframe(tf, ksi, mask);
 	else
 #endif /* notyet */
 		setup_linux_sigframe(tf, ksi, mask);
 	/* Signal handler for trampoline code */
 	tf->tf_regs[FRAME_T12] = (u_int64_t)catcher;
 	tf->tf_regs[FRAME_A0] = native_to_linux_signo[sig];
 	/*
 	 * Linux has a custom restorer option.  To support it we would
 	 * need to store an array of restorers and a sigcode block
 	 * which knew to use it.  Doesn't seem worth the trouble.
 	 * -erh
 	 */
 #ifdef DEBUG
 	if (sigdebug & SDB_FOLLOW)
 		printf("sendsig(%d): pc %lx, catcher %lx\n", l->l_proc->p_pid,
 		    tf->tf_regs[FRAME_PC], tf->tf_regs[FRAME_A3]);
 	if ((sigdebug & SDB_KSTACK) && l->l_proc->p_pid == sigpid)
 		printf("sendsig(%d): sig %d returns\n", l->l_proc->p_pid, sig);
 #endif
+}
 /*
  * System call to cleanup state after a signal
  * has been taken.  Reset signal mask and
  * stack state from context left by sendsig (above).
  * Return to previous pc as specified by context
  * left by sendsig.
  * Linux real-time signals use a different sigframe,
  * but the sigcontext is the same.
  */
 int
 linux_restore_sigcontext(struct lwp *l, struct linux_sigcontext context,
 			 sigset_t *mask)
+{
 	struct proc *p = l->l_proc;
 	struct pcb *pcb;
 	/*
 	 * Linux doesn't (yet) have alternate signal stacks.
 	 * However, the OSF/1 sigcontext which they use has
 	 * an onstack member.  This could be needed in the future.
 	 */
 	mutex_enter(p->p_lock);
 	if (context.sc_onstack & LINUX_SA_ONSTACK)
 	    l->l_sigstk.ss_flags |= SS_ONSTACK;
 	else
 	    l->l_sigstk.ss_flags &= ~SS_ONSTACK;
 	/* Reset the signal mask */
 	(void) sigprocmask1(l, SIG_SETMASK, mask, 0);
 	mutex_exit(p->p_lock);
 	/*
 	 * Check for security violations.
 	 * Linux doesn't allow any changes to the PSL.
 	 */
 	if (context.sc_ps != ALPHA_PSL_USERMODE)
 	    return(EINVAL);
 	l->l_md.md_tf->tf_regs[FRAME_PC] = context.sc_pc;
 	l->l_md.md_tf->tf_regs[FRAME_PS] = context.sc_ps;
 	regtoframe((struct reg *)context.sc_regs, l->l_md.md_tf);
 	alpha_pal_wrusp(context.sc_regs[R_SP]);
 	if (l == fpcurlwp)
 	    fpcurlwp = NULL;
 	/* Restore fp regs and fpr_cr */
 	pcb = lwp_getpcb(l);
 	memcpy(&pcb->pcb_fp, (struct fpreg *)context.sc_fpregs,
 	    sizeof(struct fpreg));
 	/* XXX sc_ownedfp ? */
 	/* XXX sc_fp_control ? */
 #ifdef DEBUG
 	if (sigdebug & SDB_FOLLOW)
 		printf("linux_rt_sigreturn(%d): returns\n", p->p_pid);
 #endif
 	return (EJUSTRETURN);
+}
 int
 linux_sys_rt_sigreturn(struct lwp *l, const struct linux_sys_rt_sigreturn_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(struct linux_rt_sigframe *) sfp;
 	} */
 	struct linux_rt_sigframe *sfp, sigframe;
 	sigset_t mask;
 	/*
 	 * 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.
 	 */
 	sfp = SCARG(uap, sfp);
 	if (ALIGN(sfp) != (u_int64_t)sfp)
 		return(EINVAL);
 	/*
 	 * Fetch the frame structure.
 	 */
 	if (copyin((void *)sfp, &sigframe,
 			sizeof(struct linux_rt_sigframe)) != 0)
 		return (EFAULT);
 	/* Grab the signal mask */
 	linux_to_native_sigset(&mask, &sigframe.uc.uc_sigmask);
 	return(linux_restore_sigcontext(l, sigframe.uc.uc_mcontext, &mask));
+}
 int
 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(struct linux_sigframe *) sfp;
 	} */
 	struct linux_sigframe *sfp, frame;
 	sigset_t mask;
 	/*
 	 * 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.
 	 */
 	sfp = SCARG(uap, sfp);
 	if (ALIGN(sfp) != (u_int64_t)sfp)
 		return(EINVAL);
 	/*
 	 * Fetch the frame structure.
 	 */
 	if (copyin((void *)sfp, &frame, sizeof(struct linux_sigframe)) != 0)
 		return(EFAULT);
 	/* Grab the signal mask. */
 	/* XXX use frame.extramask */
 	linux_old_to_native_sigset(&mask, frame.sf_sc.sc_mask);
 	return(linux_restore_sigcontext(l, frame.sf_sc, &mask));
+}
 /*
  * We come here in a last attempt to satisfy a Linux ioctl() call
  */
 /* XXX XAX update this, add maps, etc... */
 int
 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval)
+{
 	/* {
 		syscallarg(int) fd;
 		syscallarg(u_long) com;
 		syscallarg(void *) data;
 	} */
 	struct sys_ioctl_args bia;
 	u_long com;
 	SCARG(&bia, fd) = SCARG(uap, fd);
 	SCARG(&bia, data) = SCARG(uap, data);
 	com = SCARG(uap, com);
 	switch (com) {
 	default:
 		printf("linux_machdepioctl: invalid ioctl %08lx\n", com);
 		return EINVAL;
+	}
 	SCARG(&bia, com) = com;
 	return sys_ioctl(l, &bia, retval);
+}
 /* XXX XAX fix this */
 dev_t
 linux_fakedev(dev_t dev, int raw)
+{
 	return dev;
+}
 int
 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
+{
 	return 0;
+}