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linux_machdep.c revision 1.31 
      1 /*	$NetBSD: linux_machdep.c,v 1.31 2013/08/18 07:01:45 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1995, 2000 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Frank van der Linden.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 
     34 __KERNEL_RCSID(0, "$NetBSD: linux_machdep.c,v 1.31 2013/08/18 07:01:45 matt Exp $");
     35 
     36 #include <sys/param.h>
     37 #include <sys/systm.h>
     38 #include <sys/signalvar.h>
     39 #include <sys/kernel.h>
     40 #include <sys/proc.h>
     41 #include <sys/buf.h>
     42 #include <sys/reboot.h>
     43 #include <sys/conf.h>
     44 #include <sys/exec.h>
     45 #include <sys/file.h>
     46 #include <sys/callout.h>
     47 #include <sys/malloc.h>
     48 #include <sys/mbuf.h>
     49 #include <sys/msgbuf.h>
     50 #include <sys/mount.h>
     51 #include <sys/vnode.h>
     52 #include <sys/device.h>
     53 #include <sys/syscallargs.h>
     54 #include <sys/filedesc.h>
     55 #include <sys/exec_elf.h>
     56 #include <sys/disklabel.h>
     57 #include <sys/ioctl.h>
     58 
     59 #include <miscfs/specfs/specdev.h>
     60 
     61 #include <compat/linux/common/linux_types.h>
     62 #include <compat/linux/common/linux_signal.h>
     63 #include <compat/linux/common/linux_util.h>
     64 #include <compat/linux/common/linux_ioctl.h>
     65 #include <compat/linux/common/linux_hdio.h>
     66 #include <compat/linux/common/linux_exec.h>
     67 #include <compat/linux/common/linux_machdep.h>
     68 #include <compat/linux/linux_syscallargs.h>
     69 
     70 #include <arm/locore.h>
     71 
     72 void
     73 linux_setregs(struct lwp *l, struct exec_package *epp, vaddr_t stack)
     74 {
     75 
     76 	setregs(l, epp, stack);
     77 }
     78 
     79 void
     80 linux_sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
     81 {
     82 	struct lwp * const l = curlwp;
     83 	struct proc * const p = l->l_proc;
     84 	struct trapframe * const tf = lwp_trapframe(l);
     85 	struct linux_sigframe *fp, frame;
     86 	int onstack, error;
     87 	const int sig = ksi->ksi_signo;
     88 	sig_t catcher = SIGACTION(p, sig).sa_handler;
     89 
     90 
     91 	/*
     92 	 * The Linux version of this code is in
     93 	 * linux/arch/arm/kernel/signal.c.
     94 	 */
     95 
     96 	/* Do we need to jump onto the signal stack? */
     97 	onstack =
     98 	    (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 &&
     99 	    (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
    100 
    101 	/* Allocate space for the signal handler context. */
    102 	if (onstack)
    103 		fp = (struct linux_sigframe *)((char *)l->l_sigstk.ss_sp +
    104 					  l->l_sigstk.ss_size);
    105 	else
    106 		fp = (struct linux_sigframe *)tf->tf_usr_sp;
    107 	fp--;
    108 
    109 	/* Build stack frame for signal trampoline. */
    110 
    111 	/* Save register context. */
    112 	frame.sf_sc.sc_r0     = tf->tf_r0;
    113 	frame.sf_sc.sc_r1     = tf->tf_r1;
    114 	frame.sf_sc.sc_r2     = tf->tf_r2;
    115 	frame.sf_sc.sc_r3     = tf->tf_r3;
    116 	frame.sf_sc.sc_r4     = tf->tf_r4;
    117 	frame.sf_sc.sc_r5     = tf->tf_r5;
    118 	frame.sf_sc.sc_r6     = tf->tf_r6;
    119 	frame.sf_sc.sc_r7     = tf->tf_r7;
    120 	frame.sf_sc.sc_r8     = tf->tf_r8;
    121 	frame.sf_sc.sc_r9     = tf->tf_r9;
    122 	frame.sf_sc.sc_r10    = tf->tf_r10;
    123 	frame.sf_sc.sc_r11    = tf->tf_r11;
    124 	frame.sf_sc.sc_r12    = tf->tf_r12;
    125 	frame.sf_sc.sc_sp     = tf->tf_usr_sp;
    126 	frame.sf_sc.sc_lr     = tf->tf_usr_lr;
    127 	frame.sf_sc.sc_pc     = tf->tf_pc;
    128 	frame.sf_sc.sc_cpsr   = tf->tf_spsr;
    129 
    130 	/* Save signal stack. */
    131 	/* Linux doesn't save the onstack flag in sigframe */
    132 
    133 	/* Save signal mask. */
    134 	native_to_linux_old_extra_sigset(&frame.sf_sc.sc_mask,
    135 	    frame.sf_extramask, mask);
    136 
    137 	/* Other state (mostly faked) */
    138 	/*
    139 	 * trapno should indicate the trap that caused the signal:
    140 	 * 6  -> undefined instruction
    141 	 * 11 -> address exception
    142 	 * 14 -> data/prefetch abort
    143 	 */
    144 	frame.sf_sc.sc_trapno = 0;
    145 	frame.sf_sc.sc_error_code = 0;
    146 	frame.sf_sc.sc_fault_address = (u_int32_t) ksi->ksi_addr;
    147 	sendsig_reset(l, sig);
    148 
    149 	mutex_exit(p->p_lock);
    150 	error = copyout(&frame, fp, sizeof(frame));
    151 	mutex_enter(p->p_lock);
    152 
    153 	if (error != 0) {
    154 		/*
    155 		 * Process has trashed its stack; give it an illegal
    156 		 * instruction to halt it in its tracks.
    157 		 */
    158 		sigexit(l, SIGILL);
    159 		/* NOTREACHED */
    160 	}
    161 	/*
    162 	 * Build context to run handler in.
    163 	 */
    164 	tf->tf_r0 = native_to_linux_signo[sig];
    165 	tf->tf_r1 = 0; /* XXX Should be a siginfo_t */
    166 	tf->tf_r2 = 0;
    167 	tf->tf_r3 = (register_t)catcher;
    168 	tf->tf_usr_sp = (register_t)fp;
    169 	tf->tf_pc = (register_t)p->p_sigctx.ps_sigcode;
    170 
    171 	/* Remember that we're now on the signal stack. */
    172 	if (onstack)
    173 		l->l_sigstk.ss_flags |= SS_ONSTACK;
    174 
    175 }
    176 
    177 #if 0
    178 /*
    179  * System call to cleanup state after a signal
    180  * has been taken.  Reset signal mask and
    181  * stack state from context left by sendsig (above).
    182  * Return to previous pc and psl as specified by
    183  * context left by sendsig. Check carefully to
    184  * make sure that the user has not modified the
    185  * psl to gain improper privileges or to cause
    186  * a machine fault.
    187  */
    188 int
    189 linux_sys_rt_sigreturn(struct proc *p, void *v, register_t *retval)
    190 {
    191 	/* XXX XAX write me */
    192 	return(ENOSYS);
    193 }
    194 #endif
    195 
    196 int
    197 linux_sys_sigreturn(struct lwp *l, const struct linux_sys_sigreturn_args *v,
    198 	register_t *retval)
    199 {
    200 	struct trapframe * const tf = lwp_trapframe(l);
    201 	struct proc * const p = l->l_proc;
    202 	struct linux_sigframe *sfp, frame;
    203 	sigset_t mask;
    204 
    205 	/*
    206 	 * The trampoline code hands us the context.
    207 	 * It is unsafe to keep track of it ourselves, in the event that a
    208 	 * program jumps out of a signal handler.
    209 	 */
    210 	sfp = (struct linux_sigframe *)tf->tf_usr_sp;
    211 	if (copyin((void *)sfp, &frame, sizeof(*sfp)) != 0)
    212 		return (EFAULT);
    213 
    214 	/*
    215 	 * Make sure the processor mode has not been tampered with and
    216 	 * interrupts have not been disabled.
    217 	 */
    218 	if (!VALID_R15_PSR(frame.sf_sc.sc_pc, frame.sf_sc.sc_cpsr))
    219 		return EINVAL;
    220 
    221 	/* Restore register context. */
    222 	tf->tf_r0    = frame.sf_sc.sc_r0;
    223 	tf->tf_r1    = frame.sf_sc.sc_r1;
    224 	tf->tf_r2    = frame.sf_sc.sc_r2;
    225 	tf->tf_r3    = frame.sf_sc.sc_r3;
    226 	tf->tf_r4    = frame.sf_sc.sc_r4;
    227 	tf->tf_r5    = frame.sf_sc.sc_r5;
    228 	tf->tf_r6    = frame.sf_sc.sc_r6;
    229 	tf->tf_r7    = frame.sf_sc.sc_r7;
    230 	tf->tf_r8    = frame.sf_sc.sc_r8;
    231 	tf->tf_r9    = frame.sf_sc.sc_r9;
    232 	tf->tf_r10   = frame.sf_sc.sc_r10;
    233 	tf->tf_r11   = frame.sf_sc.sc_r11;
    234 	tf->tf_r12   = frame.sf_sc.sc_r12;
    235 	tf->tf_usr_sp = frame.sf_sc.sc_sp;
    236 	tf->tf_usr_lr = frame.sf_sc.sc_lr;
    237 	tf->tf_pc    = frame.sf_sc.sc_pc;
    238 	tf->tf_spsr  = frame.sf_sc.sc_cpsr;
    239 
    240 	mutex_enter(p->p_lock);
    241 
    242 	/* Restore signal stack. */
    243 	l->l_sigstk.ss_flags &= ~SS_ONSTACK;
    244 
    245 	/* Restore signal mask. */
    246 	linux_old_extra_to_native_sigset(&mask, &frame.sf_sc.sc_mask,
    247 	    frame.sf_extramask);
    248 	(void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
    249 
    250 	mutex_exit(p->p_lock);
    251 
    252 	return (EJUSTRETURN);
    253 }
    254 
    255 /*
    256  * major device numbers remapping
    257  */
    258 dev_t
    259 linux_fakedev(dev_t dev, int raw)
    260 {
    261 	/* XXX write me */
    262 	return dev;
    263 }
    264 
    265 /*
    266  * We come here in a last attempt to satisfy a Linux ioctl() call
    267  */
    268 int
    269 linux_machdepioctl(struct lwp *l, const struct linux_sys_ioctl_args *uap, register_t *retval)
    270 {
    271 	/* {
    272 		syscallarg(int) fd;
    273 		syscallarg(u_long) com;
    274 		syscallarg(void *) data;
    275 	} */
    276 	struct sys_ioctl_args bia;
    277 	u_long com;
    278 
    279 	SCARG(&bia, fd) = SCARG(uap, fd);
    280 	SCARG(&bia, data) = SCARG(uap, data);
    281 	com = SCARG(uap, com);
    282 
    283 	switch (com) {
    284 	default:
    285 		printf("linux_machdepioctl: invalid ioctl %08lx\n", com);
    286 		return EINVAL;
    287 	}
    288 	SCARG(&bia, com) = com;
    289 
    290 	return sys_ioctl(l, &bia, retval);
    291 }
    292 
    293 int
    294 linux_usertrap(struct lwp *l, vaddr_t trapaddr, void *arg)
    295 {
    296 	return 0;
    297 }
    298