-/* $OpenBSD: machdep.c,v 1.22 1997/02/21 09:02:41 niklas Exp $ */
+/* $OpenBSD: machdep.c,v 1.23 1997/03/26 18:30:50 niklas Exp $ */
/* $NetBSD: machdep.c,v 1.82 1996/12/17 07:32:54 is Exp $ */
/*
/* NOTREACHED */
}
-#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 */
- siginfo_t *sf_sip; /* pointer to siginfo_t */
- 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 */
- siginfo_t sf_si; /* actual siginfo_t */
-};
-
-#ifdef DEBUG
-int sigdebug = 0x0;
-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, type, val)
- sig_t catcher;
- int sig, mask;
- u_long code;
- int type;
- union sigval val;
-{
- 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;
- extern short exframesize[];
- extern char sigcode[], esigcode[];
-
-
-#if 0
-printf("sendsig %d %d %x %x %x\n", p->p_pid, sig, mask, code, catcher);
-#endif
-
- 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'.
- */
- if ((psp->ps_flags & SAS_ALTSTACK) && oonstack == 0 &&
- (psp->ps_sigonstack & sigmask(sig))) {
- fp = (struct sigframe *)(psp->ps_sigstk.ss_sp +
- psp->ps_sigstk.ss_size - sizeof(struct sigframe));
- psp->ps_sigstk.ss_flags |= SS_ONSTACK;
- } else
- fp = (struct sigframe *)frame->f_regs[SP] - 1;
- 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 %p usp %p scp %p ft %d\n",
- p->p_pid, sig, &oonstack, fp, &fp->sf_sc, ft);
-#endif
- if (useracc((caddr_t)fp, sizeof(struct sigframe), 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 = malloc(sizeof(struct sigframe), M_TEMP, M_WAITOK);
- /*
- * Build the argument list for the signal handler.
- */
- kfp->sf_signum = sig;
- kfp->sf_sip = NULL;
- 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 >= FMT9) {
-#ifdef DEBUG
- if (ft != FMT9 && ft != FMTA && ft != FMTB)
- 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, 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
- }
-#ifdef FPCOPROC
- 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 %p\n", p->p_pid,
- *(u_int *)&kfp->sf_state.ss_fpstate,
- &kfp->sf_state.ss_fpstate);
-#endif
-#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;
-
- if (psp->ps_siginfo & sigmask(sig)) {
- kfp->sf_sip = &fp->sf_si;
- initsiginfo(&kfp->sf_si, sig, code, type, val);
- }
-
- /* XXX do not copy out siginfo if not needed */
- (void)copyout((caddr_t)kfp, (caddr_t)fp, sizeof(struct sigframe));
- frame->f_regs[SP] = (int)fp;
-#ifdef DEBUG
- if (sigdebug & SDB_FOLLOW)
- printf("sendsig(%d): sig %d scp %p fp %p 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)(((char *)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.
- */
-/* ARGSUSED */
-int
-sys_sigreturn(p, v, retval)
- struct proc *p;
- void *v;
- register_t *retval;
-{
- struct sys_sigreturn_args /* {
- syscallarg(struct sigcontext *) sigcntxp;
- } */ *uap = v;
- struct sigcontext *scp, context;
- struct frame *frame;
- int rf, flags;
- struct sigstate tstate;
- extern short exframesize[];
-
- scp = SCARG(uap, sigcntxp);
-#ifdef DEBUG
- if (sigdebug & SDB_FOLLOW)
- printf("sigreturn: pid %d, scp %p\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(scp, &context, sizeof(context)))
- return(EINVAL);
- scp = &context;
- if ((scp->sc_ps & (PSL_MBZ|PSL_IPL|PSL_S)) != 0)
- return(EINVAL);
- /*
- * Restore the user supplied information
- */
- if (scp->sc_onstack & 1)
- 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 %p usp %x scp %p 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
- }
-#ifdef FPCOPROC
- /*
- * Finally we restore the original FP context
- */
- if (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 %p\n",
- p->p_pid, *(u_int *)&tstate.ss_fpstate,
- &tstate.ss_fpstate);
-#endif
-#endif
-#ifdef DEBUG
- if ((sigdebug & SDB_FOLLOW) ||
- ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid))
- printf("sigreturn(%d): returns\n", p->p_pid);
-#endif
- return (EJUSTRETURN);
-}
-
static int waittime = -1;
void
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