Move sendsig() and sys_sigreturn() from machdep.c to here.
Should probably move to m68k/m68k eventually...
This commit is contained in:
gwr
parent
443faad4e1
commit
91c7291256
376
sys/arch/sun3/sun3/sig_machdep.c
Normal file
376
sys/arch/sun3/sun3/sig_machdep.c
Normal file
@ -0,0 +1,376 @@
|
||||
/* $NetBSD: sig_machdep.c,v 1.1 1997/02/13 22:04:03 gwr Exp $ */
|
||||
|
||||
/*
|
||||
* Copyright (c) 1988 University of Utah.
|
||||
* Copyright (c) 1982, 1986, 1990, 1993
|
||||
* The Regents of the University of California. All rights reserved.
|
||||
*
|
||||
* This code is derived from software contributed to Berkeley by
|
||||
* the Systems Programming Group of the University of Utah Computer
|
||||
* Science Department.
|
||||
*
|
||||
* 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 the University of
|
||||
* California, Berkeley and its contributors.
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
||||
* without specific prior written permission.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
||||
*
|
||||
* from: Utah Hdr: machdep.c 1.74 92/12/20
|
||||
* from: @(#)machdep.c 8.10 (Berkeley) 4/20/94
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/kernel.h>
|
||||
#include <sys/proc.h>
|
||||
#include <sys/user.h>
|
||||
#include <sys/exec.h>
|
||||
#include <sys/ioctl.h>
|
||||
#include <sys/mount.h>
|
||||
#include <sys/signal.h>
|
||||
#include <sys/signalvar.h>
|
||||
#include <sys/malloc.h>
|
||||
#include <sys/buf.h>
|
||||
|
||||
#include <sys/syscallargs.h>
|
||||
|
||||
#include <machine/cpu.h>
|
||||
#include <machine/reg.h>
|
||||
#include <machine/machdep.h>
|
||||
|
||||
extern short exframesize[];
|
||||
|
||||
|
||||
#define SS_RTEFRAME 1
|
||||
#define SS_FPSTATE 2
|
||||
#define SS_USERREGS 4
|
||||
|
||||
struct sigstate {
|
||||
int ss_flags; /* which of the following are valid */
|
||||
struct frame ss_frame; /* original exception frame */
|
||||
struct fpframe ss_fpstate; /* 68881/68882 state info */
|
||||
};
|
||||
|
||||
/*
|
||||
* WARNING: code in locore.s assumes the layout shown for sf_signum
|
||||
* thru sf_handler so... don't screw with them!
|
||||
*/
|
||||
struct sigframe {
|
||||
int sf_signum; /* signo for handler */
|
||||
int sf_code; /* additional info for handler */
|
||||
struct sigcontext *sf_scp; /* context ptr for handler */
|
||||
sig_t sf_handler; /* handler addr for u_sigc */
|
||||
struct sigstate sf_state; /* state of the hardware */
|
||||
struct sigcontext sf_sc; /* actual context */
|
||||
};
|
||||
|
||||
#ifdef DEBUG
|
||||
int sigdebug = 0;
|
||||
int sigpid = 0;
|
||||
#define SDB_FOLLOW 0x01
|
||||
#define SDB_KSTACK 0x02
|
||||
#define SDB_FPSTATE 0x04
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Send an interrupt to process.
|
||||
*/
|
||||
void
|
||||
sendsig(catcher, sig, mask, code)
|
||||
sig_t catcher;
|
||||
int sig, mask;
|
||||
u_long code;
|
||||
{
|
||||
register struct proc *p = curproc;
|
||||
register struct sigframe *fp, *kfp;
|
||||
register struct frame *frame;
|
||||
register struct sigacts *psp = p->p_sigacts;
|
||||
register short ft;
|
||||
int oonstack, fsize;
|
||||
extern char sigcode[], esigcode[];
|
||||
|
||||
frame = (struct frame *)p->p_md.md_regs;
|
||||
ft = frame->f_format;
|
||||
oonstack = psp->ps_sigstk.ss_flags & SS_ONSTACK;
|
||||
|
||||
/*
|
||||
* Allocate and validate space for the signal handler
|
||||
* context. Note that if the stack is in P0 space, the
|
||||
* call to grow() is a nop, and the useracc() check
|
||||
* will fail if the process has not already allocated
|
||||
* the space with a `brk'.
|
||||
*/
|
||||
fsize = sizeof(struct sigframe);
|
||||
if ((psp->ps_flags & SAS_ALTSTACK) && !oonstack &&
|
||||
(psp->ps_sigonstack & sigmask(sig))) {
|
||||
fp = (struct sigframe *)(psp->ps_sigstk.ss_sp +
|
||||
psp->ps_sigstk.ss_size - fsize);
|
||||
psp->ps_sigstk.ss_flags |= SS_ONSTACK;
|
||||
} else
|
||||
fp = (struct sigframe *)(frame->f_regs[SP] - fsize);
|
||||
if ((unsigned)fp <= USRSTACK - ctob(p->p_vmspace->vm_ssize))
|
||||
(void)grow(p, (unsigned)fp);
|
||||
#ifdef DEBUG
|
||||
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
|
||||
printf("sendsig(%d): sig %d ssp %x usp %x scp %x ft %d\n",
|
||||
p->p_pid, sig, &oonstack, fp, &fp->sf_sc, ft);
|
||||
#endif
|
||||
if (useracc((caddr_t)fp, fsize, B_WRITE) == 0) {
|
||||
#ifdef DEBUG
|
||||
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
|
||||
printf("sendsig(%d): useracc 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.
|
||||
*/
|
||||
SIGACTION(p, SIGILL) = SIG_DFL;
|
||||
sig = sigmask(SIGILL);
|
||||
p->p_sigignore &= ~sig;
|
||||
p->p_sigcatch &= ~sig;
|
||||
p->p_sigmask &= ~sig;
|
||||
psignal(p, SIGILL);
|
||||
return;
|
||||
}
|
||||
kfp = (struct sigframe *)malloc((u_long)fsize, M_TEMP, M_WAITOK);
|
||||
/*
|
||||
* Build the argument list for the signal handler.
|
||||
*/
|
||||
kfp->sf_signum = sig;
|
||||
kfp->sf_code = code;
|
||||
kfp->sf_scp = &fp->sf_sc;
|
||||
kfp->sf_handler = catcher;
|
||||
/*
|
||||
* Save necessary hardware state. Currently this includes:
|
||||
* - general registers
|
||||
* - original exception frame (if not a "normal" frame)
|
||||
* - FP coprocessor state
|
||||
*/
|
||||
kfp->sf_state.ss_flags = SS_USERREGS;
|
||||
bcopy((caddr_t)frame->f_regs,
|
||||
(caddr_t)kfp->sf_state.ss_frame.f_regs, sizeof frame->f_regs);
|
||||
if (ft >= FMT7) {
|
||||
#ifdef DEBUG
|
||||
if (ft > 15 || exframesize[ft] < 0)
|
||||
panic("sendsig: bogus frame type");
|
||||
#endif
|
||||
kfp->sf_state.ss_flags |= SS_RTEFRAME;
|
||||
kfp->sf_state.ss_frame.f_format = frame->f_format;
|
||||
kfp->sf_state.ss_frame.f_vector = frame->f_vector;
|
||||
bcopy((caddr_t)&frame->F_u,
|
||||
(caddr_t)&kfp->sf_state.ss_frame.F_u,
|
||||
(size_t) exframesize[ft]);
|
||||
/*
|
||||
* Leave an indicator that we need to clean up the kernel
|
||||
* stack. We do this by setting the "pad word" above the
|
||||
* hardware stack frame to the amount the stack must be
|
||||
* adjusted by.
|
||||
*
|
||||
* N.B. we increment rather than just set f_stackadj in
|
||||
* case we are called from syscall when processing a
|
||||
* sigreturn. In that case, f_stackadj may be non-zero.
|
||||
*/
|
||||
frame->f_stackadj += exframesize[ft];
|
||||
frame->f_format = frame->f_vector = 0;
|
||||
#ifdef DEBUG
|
||||
if (sigdebug & SDB_FOLLOW)
|
||||
printf("sendsig(%d): copy out %d of frame %d\n",
|
||||
p->p_pid, exframesize[ft], ft);
|
||||
#endif
|
||||
}
|
||||
|
||||
if (fpu_type) {
|
||||
kfp->sf_state.ss_flags |= SS_FPSTATE;
|
||||
m68881_save(&kfp->sf_state.ss_fpstate);
|
||||
}
|
||||
#ifdef DEBUG
|
||||
if ((sigdebug & SDB_FPSTATE) && *(char *)&kfp->sf_state.ss_fpstate)
|
||||
printf("sendsig(%d): copy out FP state (%x) to %x\n",
|
||||
p->p_pid, *(u_int *)&kfp->sf_state.ss_fpstate,
|
||||
&kfp->sf_state.ss_fpstate);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Build the signal context to be used by sigreturn.
|
||||
*/
|
||||
kfp->sf_sc.sc_onstack = oonstack;
|
||||
kfp->sf_sc.sc_mask = mask;
|
||||
kfp->sf_sc.sc_sp = frame->f_regs[SP];
|
||||
kfp->sf_sc.sc_fp = frame->f_regs[A6];
|
||||
kfp->sf_sc.sc_ap = (int)&fp->sf_state;
|
||||
kfp->sf_sc.sc_pc = frame->f_pc;
|
||||
kfp->sf_sc.sc_ps = frame->f_sr;
|
||||
(void) copyout((caddr_t)kfp, (caddr_t)fp, fsize);
|
||||
frame->f_regs[SP] = (int)fp;
|
||||
#ifdef DEBUG
|
||||
if (sigdebug & SDB_FOLLOW)
|
||||
printf("sendsig(%d): sig %d scp %x fp %x sc_sp %x sc_ap %x\n",
|
||||
p->p_pid, sig, kfp->sf_scp, fp,
|
||||
kfp->sf_sc.sc_sp, kfp->sf_sc.sc_ap);
|
||||
#endif
|
||||
/*
|
||||
* Signal trampoline code is at base of user stack.
|
||||
*/
|
||||
frame->f_pc = (int)PS_STRINGS - (esigcode - sigcode);
|
||||
#ifdef DEBUG
|
||||
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
|
||||
printf("sendsig(%d): sig %d returns\n",
|
||||
p->p_pid, sig);
|
||||
#endif
|
||||
free((caddr_t)kfp, M_TEMP);
|
||||
}
|
||||
|
||||
/*
|
||||
* 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
|
||||
* psl to gain improper priviledges or to cause
|
||||
* a machine fault.
|
||||
*/
|
||||
int
|
||||
sys_sigreturn(p, v, retval)
|
||||
struct proc *p;
|
||||
void *v;
|
||||
register_t *retval;
|
||||
{
|
||||
struct sys_sigreturn_args *uap = v;
|
||||
register struct sigcontext *scp;
|
||||
register struct frame *frame;
|
||||
register int rf;
|
||||
struct sigcontext tsigc;
|
||||
struct sigstate tstate;
|
||||
int flags;
|
||||
|
||||
scp = SCARG(uap, sigcntxp);
|
||||
#ifdef DEBUG
|
||||
if (sigdebug & SDB_FOLLOW)
|
||||
printf("sigreturn: pid %d, scp %x\n", p->p_pid, scp);
|
||||
#endif
|
||||
if ((int)scp & 1)
|
||||
return (EINVAL);
|
||||
|
||||
/*
|
||||
* Test and fetch the context structure.
|
||||
* We grab it all at once for speed.
|
||||
*/
|
||||
if (useracc((caddr_t)scp, sizeof (*scp), B_WRITE) == 0 ||
|
||||
copyin((caddr_t)scp, (caddr_t)&tsigc, sizeof tsigc))
|
||||
return (EINVAL);
|
||||
scp = &tsigc;
|
||||
if ((scp->sc_ps & (PSL_MBZ|PSL_IPL|PSL_S)) != 0)
|
||||
return (EINVAL);
|
||||
/*
|
||||
* Restore the user supplied information
|
||||
*/
|
||||
if (scp->sc_onstack & 01)
|
||||
p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK;
|
||||
else
|
||||
p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK;
|
||||
p->p_sigmask = scp->sc_mask &~ sigcantmask;
|
||||
frame = (struct frame *) p->p_md.md_regs;
|
||||
frame->f_regs[SP] = scp->sc_sp;
|
||||
frame->f_regs[A6] = scp->sc_fp;
|
||||
frame->f_pc = scp->sc_pc;
|
||||
frame->f_sr = scp->sc_ps;
|
||||
|
||||
/*
|
||||
* Grab pointer to hardware state information.
|
||||
* If zero, the user is probably doing a longjmp.
|
||||
*/
|
||||
if ((rf = scp->sc_ap) == 0)
|
||||
return (EJUSTRETURN);
|
||||
/*
|
||||
* See if there is anything to do before we go to the
|
||||
* expense of copying in close to 1/2K of data
|
||||
*/
|
||||
flags = fuword((caddr_t)rf);
|
||||
#ifdef DEBUG
|
||||
if (sigdebug & SDB_FOLLOW)
|
||||
printf("sigreturn(%d): sc_ap %x flags %x\n",
|
||||
p->p_pid, rf, flags);
|
||||
#endif
|
||||
/*
|
||||
* fuword failed (bogus sc_ap value).
|
||||
*/
|
||||
if (flags == -1)
|
||||
return (EINVAL);
|
||||
if (flags == 0 || copyin((caddr_t)rf, (caddr_t)&tstate, sizeof tstate))
|
||||
return (EJUSTRETURN);
|
||||
#ifdef DEBUG
|
||||
if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)
|
||||
printf("sigreturn(%d): ssp %x usp %x scp %x ft %d\n",
|
||||
p->p_pid, &flags, scp->sc_sp, SCARG(uap, sigcntxp),
|
||||
(flags&SS_RTEFRAME) ? tstate.ss_frame.f_format : -1);
|
||||
#endif
|
||||
/*
|
||||
* Restore most of the users registers except for A6 and SP
|
||||
* which were handled above.
|
||||
*/
|
||||
if (flags & SS_USERREGS)
|
||||
bcopy((caddr_t)tstate.ss_frame.f_regs,
|
||||
(caddr_t)frame->f_regs, sizeof(frame->f_regs)-2*NBPW);
|
||||
/*
|
||||
* Restore long stack frames. Note that we do not copy
|
||||
* back the saved SR or PC, they were picked up above from
|
||||
* the sigcontext structure.
|
||||
*/
|
||||
if (flags & SS_RTEFRAME) {
|
||||
register int sz;
|
||||
|
||||
/* grab frame type and validate */
|
||||
sz = tstate.ss_frame.f_format;
|
||||
if (sz > 15 || (sz = exframesize[sz]) < 0)
|
||||
return (EINVAL);
|
||||
frame->f_stackadj -= sz;
|
||||
frame->f_format = tstate.ss_frame.f_format;
|
||||
frame->f_vector = tstate.ss_frame.f_vector;
|
||||
bcopy((caddr_t)&tstate.ss_frame.F_u, (caddr_t)&frame->F_u, sz);
|
||||
#ifdef DEBUG
|
||||
if (sigdebug & SDB_FOLLOW)
|
||||
printf("sigreturn(%d): copy in %d of frame type %d\n",
|
||||
p->p_pid, sz, tstate.ss_frame.f_format);
|
||||
#endif
|
||||
}
|
||||
|
||||
/*
|
||||
* Finally we restore the original FP context
|
||||
*/
|
||||
if (fpu_type && (flags & SS_FPSTATE))
|
||||
m68881_restore(&tstate.ss_fpstate);
|
||||
#ifdef DEBUG
|
||||
if ((sigdebug & SDB_FPSTATE) && *(char *)&tstate.ss_fpstate)
|
||||
printf("sigreturn(%d): copied in FP state (%x) at %x\n",
|
||||
p->p_pid, *(u_int *)&tstate.ss_fpstate,
|
||||
&tstate.ss_fpstate);
|
||||
if ((sigdebug & SDB_FOLLOW) ||
|
||||
((sigdebug & SDB_KSTACK) && p->p_pid == sigpid))
|
||||
printf("sigreturn(%d): returns\n", p->p_pid);
|
||||
#endif
|
||||
return (EJUSTRETURN);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user