/* $OpenBSD: sig_machdep.c,v 1.2 2004/02/16 15:40:00 miod Exp $ */
/* $NetBSD: sig_machdep.c,v 1.22 2003/10/08 00:28:41 thorpej 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 <sys/param.h>
#include <sys/mount.h> /* XXX only needed by syscallargs.h */
#include <sys/proc.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/syscallargs.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <arm/armreg.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <machine/pcb.h>
#ifndef acorn26
#include <arm/cpufunc.h>
#endif
static __inline struct trapframe *
process_frame(struct proc *p)
{
return p->p_addr->u_pcb.pcb_tf;
}
void *getframe(struct proc *p, int sig, int *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.
*/
void
sendsig(sig_t catcher, int sig, int returnmask, u_long code, int type,
union sigval val)
{
struct proc *p = curproc;
struct trapframe *tf;
struct sigframe *fp, frame;
struct sigacts *psp = p->p_sigacts;
int oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK;
int onstack = 0;
tf = process_frame(p);
/* Do we need to jump onto the signal stack? */
/* Allocate space for the signal handler context. */
if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack &&
(psp->ps_sigonstack & sigmask(sig))) {
onstack = 1;
fp = (struct sigframe *)((caddr_t)psp->ps_sigstk.ss_sp +
psp->ps_sigstk.ss_size);
} else
fp = (struct sigframe *)tf->tf_usr_sp;
/* make room on the stack */
fp--;
/* make the stack aligned */
fp = (void *)STACKALIGN(fp);
/* Build stack frame for signal trampoline. */
frame.sf_signum = sig;
frame.sf_sip = NULL;
frame.sf_scp = &fp->sf_sc;
frame.sf_handler = catcher;
/* 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 = psp->ps_sigstk.ss_flags & SS_ONSTACK;
/* Save signal mask. */
frame.sf_sc.sc_mask = returnmask;
if (psp->ps_siginfo & sigmask(sig)) {
frame.sf_sip = &fp->sf_si;
initsiginfo(&frame.sf_si, sig, code, type, val);
}
if (copyout(&frame, fp, sizeof(frame)) != 0) {
/*
* Process has trashed its stack; give it an illegal
* instruction to halt it in its tracks.
*/
sigexit(p, 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 = (int)frame.sf_sip;
tf->tf_r2 = (int)frame.sf_scp;
tf->tf_pc = (int)frame.sf_handler;
tf->tf_usr_sp = (int)fp;
tf->tf_usr_lr = (int)p->p_sigcode;
/* XXX This should not be needed. */
cpu_icache_sync_all();
/* Remember that we're now on the signal stack. */
if (onstack)
psp->ps_sigstk.ss_flags |= SS_ONSTACK;
}
#if 0
void *
getframe(struct proc *p, int sig, int *onstack)
{
struct sigctx *ctx = &p->p_sigctx;
struct trapframe *tf = process_frame(l);
/* Do we need to jump onto the signal stack? */
*onstack = (ctx->ps_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0
&& (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0;
if (*onstack)
return (char *)ctx->ps_sigstk.ss_sp + ctx->ps_sigstk.ss_size;
return (void *)tf->tf_usr_sp;
}
#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 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
sys_sigreturn(struct proc *p, void *v, register_t *retval)
{
struct sys_sigreturn_args /* {
syscallarg(struct sigcontext *) sigcntxp;
} */ *uap = v;
struct sigcontext *scp, context;
struct trapframe *tf;
struct sigacts *psp = p->p_sigacts;
/*
* we do a rather scary test in userland
*/
if (v == 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((caddr_t)scp, &context, sizeof(*scp)) != 0)
return (EFAULT);
/*
* Make sure the processor mode has not been tampered with and
* interrupts have not been disabled.
*/
#ifdef __PROG32
if ((context.sc_spsr & PSR_MODE) != PSR_USR32_MODE ||
(context.sc_spsr & (I32_bit | F32_bit)) != 0)
return (EINVAL);
#else /* __PROG26 */
if ((context.sc_pc & R15_MODE) != R15_MODE_USR ||
(context.sc_pc & (R15_IRQ_DISABLE | R15_FIQ_DISABLE)) != 0)
return EINVAL;
#endif
/* Restore register context. */
tf = process_frame(p);
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;
/* Restore signal stack. */
if (context.sc_onstack & SS_ONSTACK)
psp->ps_sigstk.ss_flags |= SS_ONSTACK;
else
psp->ps_sigstk.ss_flags &= ~SS_ONSTACK;
/* Restore signal mask. */
#if 0
(void) sigprocmask1(p, SIG_SETMASK, &context.sc_mask, 0);
#else
p->p_sigmask = context.sc_mask & ~sigcantmask;
#endif
return (EJUSTRETURN);
}
#if 0
void
cpu_getmcontext(p, mcp, flags)
struct proc *p;
mcontext_t *mcp;
unsigned int *flags;
{
struct trapframe *tf = process_frame(p);
__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,
(caddr_t) 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(p, mcp, flags)
struct proc *p;
const mcontext_t *mcp;
unsigned int flags;
{
struct trapframe *tf = process_frame(l);
__greg_t *gr = mcp->__gregs;
if ((flags & _UC_CPU) != 0) {
/* Restore General Register context. */
/* Make sure the processor mode has not been tampered with. */
#ifdef PROG32
if ((gr[_REG_CPSR] & PSR_MODE) != PSR_USR32_MODE ||
(gr[_REG_CPSR] & (I32_bit | F32_bit)) != 0)
return (EINVAL);
#else /* PROG26 */
if ((gr[_REG_PC] & R15_MODE) != R15_MODE_USR ||
(gr[_REG_PC] & (R15_IRQ_DISABLE | R15_FIQ_DISABLE)) != 0)
return (EINVAL);
#endif
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
if (flags & _UC_SETSTACK)
l->l_proc->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK;
if (flags & _UC_CLRSTACK)
l->l_proc->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK;
return (0);
}
#endif
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