NetBSD-5.0.2/sys/arch/arm/arm/sig_machdep.c
/* $NetBSD: sig_machdep.c,v 1.35 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: sig_machdep.c,v 1.35 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
void *
getframe(struct lwp *l, int sig, int *onstack)
{
struct proc *p = l->l_proc;
struct trapframe *tf = process_frame(l);
/* 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;
if (*onstack)
return (char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size;
return (void *)tf->tf_usr_sp;
}
/*
* 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.
*/
static void
sendsig_siginfo(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_siginfo *fp, frame;
int onstack, error;
int sig = ksi->ksi_signo;
sig_t catcher = SIGACTION(p, sig).sa_handler;
/* get the current frame */
tf = process_frame(l);
fp = getframe(l, sig, &onstack);
/* make room on the stack */
fp--;
/* make the stack aligned */
fp = (struct sigframe_siginfo *)STACKALIGN(fp);
/* Build stack frame for signal trampoline. */
switch (ps->sa_sigdesc[sig].sd_vers) {
case 0: /* handled by sendsig_sigcontext */
case 1: /* handled by sendsig_sigcontext */
default: /* unknown version */
printf("nsendsig: bad version %d\n",
ps->sa_sigdesc[sig].sd_vers);
sigexit(l, SIGILL);
case 2:
break;
}
/* populate the siginfo frame */
frame.sf_si._info = ksi->ksi_info;
frame.sf_uc.uc_flags = _UC_SIGMASK;
frame.sf_uc.uc_sigmask = *mask;
frame.sf_uc.uc_link = l->l_ctxlink;
frame.sf_uc.uc_flags |= (l->l_sigstk.ss_flags & SS_ONSTACK)
? _UC_SETSTACK : _UC_CLRSTACK;
memset(&frame.sf_uc.uc_stack, 0, sizeof(frame.sf_uc.uc_stack));
sendsig_reset(l, sig);
mutex_exit(p->p_lock);
cpu_getmcontext(l, &frame.sf_uc.uc_mcontext, &frame.sf_uc.uc_flags);
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.
*/
tf->tf_r0 = sig;
tf->tf_r1 = (int)&fp->sf_si;
tf->tf_r2 = (int)&fp->sf_uc;
/* the trampoline uses r5 as the uc address */
tf->tf_r5 = (int)&fp->sf_uc;
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;
tf->tf_usr_lr = (int)ps->sa_sigdesc[sig].sd_tramp;
/* Remember that we're now on the signal stack. */
if (onstack)
l->l_sigstk.ss_flags |= SS_ONSTACK;
}
void
sendsig(const ksiginfo_t *ksi, const sigset_t *mask)
{
#ifdef COMPAT_16
if (curproc->p_sigacts->sa_sigdesc[ksi->ksi_signo].sd_vers < 2)
sendsig_sigcontext(ksi, mask);
else
#endif
sendsig_siginfo(ksi, mask);
}
void
cpu_getmcontext(l, mcp, flags)
struct lwp *l;
mcontext_t *mcp;
unsigned int *flags;
{
struct trapframe *tf = process_frame(l);
__greg_t *gr = mcp->__gregs;
__greg_t ras_pc;
/* Save General Register context. */
gr[_REG_R0] = tf->tf_r0;
gr[_REG_R1] = tf->tf_r1;
gr[_REG_R2] = tf->tf_r2;
gr[_REG_R3] = tf->tf_r3;
gr[_REG_R4] = tf->tf_r4;
gr[_REG_R5] = tf->tf_r5;
gr[_REG_R6] = tf->tf_r6;
gr[_REG_R7] = tf->tf_r7;
gr[_REG_R8] = tf->tf_r8;
gr[_REG_R9] = tf->tf_r9;
gr[_REG_R10] = tf->tf_r10;
gr[_REG_R11] = tf->tf_r11;
gr[_REG_R12] = tf->tf_r12;
gr[_REG_SP] = tf->tf_usr_sp;
gr[_REG_LR] = tf->tf_usr_lr;
gr[_REG_PC] = tf->tf_pc;
gr[_REG_CPSR] = tf->tf_spsr;
if ((ras_pc = (__greg_t)ras_lookup(l->l_proc,
(void *) gr[_REG_PC])) != -1)
gr[_REG_PC] = ras_pc;
*flags |= _UC_CPU;
#ifdef ARMFPE
/* Save Floating Point Register context. */
arm_fpe_getcontext(p, (struct fpreg *)(void *)&mcp->fpregs);
*flags |= _UC_FPU;
#endif
}
int
cpu_setmcontext(l, mcp, flags)
struct lwp *l;
const mcontext_t *mcp;
unsigned int flags;
{
struct trapframe *tf = process_frame(l);
const __greg_t *gr = mcp->__gregs;
struct proc *p = l->l_proc;
if ((flags & _UC_CPU) != 0) {
/* Restore General Register context. */
/* Make sure the processor mode has not been tampered with. */
if (!VALID_R15_PSR(gr[_REG_PC], gr[_REG_CPSR]))
return EINVAL;
tf->tf_r0 = gr[_REG_R0];
tf->tf_r1 = gr[_REG_R1];
tf->tf_r2 = gr[_REG_R2];
tf->tf_r3 = gr[_REG_R3];
tf->tf_r4 = gr[_REG_R4];
tf->tf_r5 = gr[_REG_R5];
tf->tf_r6 = gr[_REG_R6];
tf->tf_r7 = gr[_REG_R7];
tf->tf_r8 = gr[_REG_R8];
tf->tf_r9 = gr[_REG_R9];
tf->tf_r10 = gr[_REG_R10];
tf->tf_r11 = gr[_REG_R11];
tf->tf_r12 = gr[_REG_R12];
tf->tf_usr_sp = gr[_REG_SP];
tf->tf_usr_lr = gr[_REG_LR];
tf->tf_pc = gr[_REG_PC];
tf->tf_spsr = gr[_REG_CPSR];
}
#ifdef ARMFPE
if ((flags & _UC_FPU) != 0) {
/* Restore Floating Point Register context. */
arm_fpe_setcontext(p, (struct fpreg *)(void *)&mcp->__fpregs);
}
#endif
mutex_enter(p->p_lock);
if (flags & _UC_SETSTACK)
l->l_sigstk.ss_flags |= SS_ONSTACK;
if (flags & _UC_CLRSTACK)
l->l_sigstk.ss_flags &= ~SS_ONSTACK;
mutex_exit(p->p_lock);
return (0);
}