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97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/* Set thread_state for sighandler, and sigcontext to recover. MIPS version.
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Copyright (C) 1994 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include <hurd/signal.h>
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#include <mach/thread_status.h>
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static void
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trampoline (void (*handler) (int signo, int sigcode, struct sigcontext *scp),
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int signo, int sigcode, struct sigcontext *scp)
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{
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(*handler) (signo, sigcode, scp);
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(void) __sigreturn (scp); /* Does not return. */
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while (1)
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LOSE; /* Firewall. */
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}
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struct sigcontext *
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_hurd_setup_sighandler (int flags,
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__sighandler_t handler,
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struct sigaltstack *sigaltstack,
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int signo, int sigcode,
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void *state)
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{
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struct mips_thread_state *ts;
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void *sigsp;
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struct sigcontext *scp;
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struct
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{
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void *retaddr; /* Never used. */
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__sighandler_t handler;
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int signo;
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int sigcode;
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struct sigcontext *scp; /* Points to ctx, below. */
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struct sigcontext ctx;
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} *stackframe;
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ts = state;
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if ((flags & SA_ONSTACK) &&
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!(sigaltstack->ss_flags & (SA_DISABLE|SA_ONSTACK)))
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{
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sigsp = sigaltstack->ss_sp + sigaltstack->ss_size;
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sigaltstack->ss_flags |= SA_ONSTACK;
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}
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else
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sigsp = (char *) ts->r29;
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/* Push the arguments to call `trampoline' on the stack. */
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sigsp -= sizeof (*stackframe);
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stackframe = sigsp;
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stackframe->handler = handler;
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stackframe->signo = signo;
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stackframe->sigcode = sigcode;
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stackframe->scp = scp = &stackframe->ctx;
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/* Set up the sigcontext from the current state of the thread. */
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scp->sc_onstack = sigaltstack->ss_flags & SA_ONSTACK ? 1 : 0;
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scp->sc_gpr[16] = ts->r16;
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scp->sc_gpr[17] = ts->r17;
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scp->sc_gpr[18] = ts->r18;
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scp->sc_gpr[19] = ts->r19;
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scp->sc_gpr[20] = ts->r20;
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scp->sc_gpr[21] = ts->r21;
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scp->sc_gpr[22] = ts->r22;
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scp->sc_gpr[23] = ts->r23;
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scp->sc_gpr[28] = ts->r28;
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scp->sc_gpr[31] = ts->r31;
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scp->sc_pc = ts->pc;
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scp->sc_sp = ts->r29;
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scp->sc_fp = ts->r30;
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/* Modify the thread state to call `trampoline' on the new stack. */
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ts->r29 = (int) sigsp;
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ts->pc = (int) &trampoline;
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return scp;
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}
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