NetBSD-5.0.2/sys/arch/arm/arm/compat_16_machdep.c
/* $NetBSD: compat_16_machdep.c,v 1.10 2008/04/24 18:39:20 ad Exp $ */
/*
* Copyright (c) 1994-1998 Mark Brinicombe.
* Copyright (c) 1994 Brini.
* All rights reserved.
*
* This code is derived from software written for Brini by Mark Brinicombe
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Mark Brinicombe
* for the NetBSD Project.
* 4. The name of the company nor the name of the author may be used to
* endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*
* Machine dependant functions for kernel setup
*
* Created : 17/09/94
*/
#include "opt_compat_netbsd.h"
#include "opt_armfpe.h"
#include <sys/param.h>
__KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.10 2008/04/24 18:39:20 ad Exp $");
#include <sys/mount.h> /* XXX only needed by syscallargs.h */
#include <sys/proc.h>
#include <sys/signal.h>
#include <sys/syscallargs.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <sys/ras.h>
#include <sys/ucontext.h>
#include <arm/armreg.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <machine/pcb.h>
#ifndef acorn26
#include <arm/cpufunc.h>
#endif
/*
* 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.
*/
#if defined(COMPAT_16) || defined(COMPAT_13)
#include <compat/sys/signal.h>
#include <compat/sys/signalvar.h>
void
sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask)
{
struct lwp *l = curlwp;
struct proc *p = l->l_proc;
struct sigacts *ps = p->p_sigacts;
struct trapframe *tf;
struct sigframe_sigcontext *fp, frame;
int onstack, error;
int sig = ksi->ksi_signo;
u_long code = KSI_TRAPCODE(ksi);
sig_t catcher = SIGACTION(p, sig).sa_handler;
tf = process_frame(l);
fp = getframe(l, sig, &onstack);
/* make room on the stack */
fp--;
/* make the stack aligned */
fp = (void *)STACKALIGN(fp);
/* Save register context. */
frame.sf_sc.sc_r0 = tf->tf_r0;
frame.sf_sc.sc_r1 = tf->tf_r1;
frame.sf_sc.sc_r2 = tf->tf_r2;
frame.sf_sc.sc_r3 = tf->tf_r3;
frame.sf_sc.sc_r4 = tf->tf_r4;
frame.sf_sc.sc_r5 = tf->tf_r5;
frame.sf_sc.sc_r6 = tf->tf_r6;
frame.sf_sc.sc_r7 = tf->tf_r7;
frame.sf_sc.sc_r8 = tf->tf_r8;
frame.sf_sc.sc_r9 = tf->tf_r9;
frame.sf_sc.sc_r10 = tf->tf_r10;
frame.sf_sc.sc_r11 = tf->tf_r11;
frame.sf_sc.sc_r12 = tf->tf_r12;
frame.sf_sc.sc_usr_sp = tf->tf_usr_sp;
frame.sf_sc.sc_usr_lr = tf->tf_usr_lr;
frame.sf_sc.sc_svc_lr = tf->tf_svc_lr;
frame.sf_sc.sc_pc = tf->tf_pc;
frame.sf_sc.sc_spsr = tf->tf_spsr;
/* Save signal stack. */
frame.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK;
/* Save signal mask. */
frame.sf_sc.sc_mask = *mask;
#ifdef COMPAT_13
/*
* XXX We always have to save an old style signal mask because
* XXX we might be delivering a signal to a process which will
* XXX escape from the signal in a non-standard way and invoke
* XXX sigreturn() directly.
*/
native_sigset_to_sigset13(mask, &frame.sf_sc.__sc_mask13);
#endif
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
error = copyout(&frame, fp, sizeof(frame));
mutex_enter(p->p_lock);
if (error != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
sigexit(l, SIGILL);
/* NOTREACHED */
}
/*
* Build context to run handler in. We invoke the handler
* directly, only returning via the trampoline. Note the
* trampoline version numbers are coordinated with machine-
* dependent code in libc.
*/
/*
* this was all in the switch below, seemed daft to duplicate it, if
* we do a new trampoline version it might change then
*/
tf->tf_r0 = sig;
tf->tf_r1 = code;
tf->tf_r2 = (int)&fp->sf_sc;
tf->tf_pc = (int)catcher;
#ifdef THUMB_CODE
if (((int) catcher) & 1)
tf->tf_spsr |= PSR_T_bit;
else
tf->tf_spsr &= ~PSR_T_bit;
#endif
tf->tf_usr_sp = (int)fp;
switch (ps->sa_sigdesc[sig].sd_vers) {
case 0: /* legacy on-stack sigtramp */
tf->tf_usr_lr = (int)p->p_sigctx.ps_sigcode;
#ifndef acorn26
/* XXX This should not be needed. */
cpu_icache_sync_all();
#endif
break;
case 1:
tf->tf_usr_lr = (int)ps->sa_sigdesc[sig].sd_tramp;
break;
default:
/* Don't know what trampoline version; kill it. */
sigexit(l, SIGILL);
}
/* Remember that we're now on the signal stack. */
if (onstack)
l->l_sigstk.ss_flags |= SS_ONSTACK;
}
/*
* 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 and psl as specified by
* context left by sendsig. Check carefully to
* make sure that the user has not modified the
* psr to gain improper privileges or to cause
* a machine fault.
*/
int
compat_16_sys___sigreturn14(struct lwp *l, const struct compat_16_sys___sigreturn14_args *uap, register_t *retval)
{
/* {
syscallarg(struct sigcontext *) sigcntxp;
} */
struct sigcontext *scp, context;
struct trapframe *tf;
struct proc *p = l->l_proc;
/*
* we do a rather scary test in userland
*/
if (uap == NULL)
return (EFAULT);
/*
* 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.
*/
scp = SCARG(uap, sigcntxp);
if (copyin((void *)scp, &context, sizeof(*scp)) != 0)
return (EFAULT);
/*
* Make sure the processor mode has not been tampered with and
* interrupts have not been disabled.
*/
if (!VALID_R15_PSR(context.sc_pc, context.sc_spsr))
return EINVAL;
/* Restore register context. */
tf = process_frame(l);
tf->tf_r0 = context.sc_r0;
tf->tf_r1 = context.sc_r1;
tf->tf_r2 = context.sc_r2;
tf->tf_r3 = context.sc_r3;
tf->tf_r4 = context.sc_r4;
tf->tf_r5 = context.sc_r5;
tf->tf_r6 = context.sc_r6;
tf->tf_r7 = context.sc_r7;
tf->tf_r8 = context.sc_r8;
tf->tf_r9 = context.sc_r9;
tf->tf_r10 = context.sc_r10;
tf->tf_r11 = context.sc_r11;
tf->tf_r12 = context.sc_r12;
tf->tf_usr_sp = context.sc_usr_sp;
tf->tf_usr_lr = context.sc_usr_lr;
tf->tf_svc_lr = context.sc_svc_lr;
tf->tf_pc = context.sc_pc;
tf->tf_spsr = context.sc_spsr;
mutex_enter(p->p_lock);
/* Restore signal stack. */
if (context.sc_onstack & SS_ONSTACK)
l->l_sigstk.ss_flags |= SS_ONSTACK;
else
l->l_sigstk.ss_flags &= ~SS_ONSTACK;
/* Restore signal mask. */
(void) sigprocmask1(l, SIG_SETMASK, &context.sc_mask, 0);
mutex_exit(p->p_lock);
return (EJUSTRETURN);
}
#endif