sysdeps/mach/hurd/mips/sigcontext.h

   1 /* Copyright (C) 1994 Free Software Foundation, Inc.
   2 This file is part of the GNU C Library.
   3
   4 The GNU C Library is free software; you can redistribute it and/or
   5 modify it under the terms of the GNU Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 License, or (at your option) any later version.
   8
   9 The GNU C Library is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 /* Signal handlers are actually called:
  20    void handler (int sig, int code, struct sigcontext *scp);  */
  21
  22 /* State of this thread when the signal was taken.  */
  23 struct sigcontext
  24   {
  25     /* These first members are machine-independent.  */
  26
  27     int sc_onstack;             /* Nonzero if running on sigstack.  */
  28     __sigset_t sc_mask;         /* Blocked signals to restore.  */
  29
  30     /* MiG reply port this thread is using.  */
  31     unsigned int sc_reply_port;
  32
  33     /* Port this thread is doing an interruptible RPC on.  */
  34     unsigned int sc_intr_port;
  35
  36     /* Error code associated with this signal (interpreted as `error_t').  */
  37     int sc_error;
  38
  39     /* All following members are machine-dependent.  The rest of this
  40        structure is written to be laid out identically to:
  41         {
  42           struct mips_thread_state ts;
  43           struct mips_exc_state es;
  44           struct mips_float_state fs;
  45         }
  46        trampoline.c knows this, so it must be changed if this changes.  */
  47 #define sc_mips_thread_state sc_gpr /* Beginning of correspondence.  */
  48     int sc_gpr[31];             /* "General" registers; [0] is r1.  */
  49     int sc_mdlo, sc_mdhi;       /* Low and high multiplication results.  */
  50     int sc_pc;                  /* Instruction pointer.  */
  51
  52     /* struct mips_exc_state */
  53 #define sc_mips_exc_state sc_cause
  54     unsigned int sc_cause;      /* Machine-level trap code.  */
  55 #define SC_CAUSE_SST    0x00000044
  56     unsigned int sc_badvaddr;
  57     unsigned int sc_coproc_used; /* Which coprocessors the thread has used.  */
  58 #define SC_COPROC_USE_COP0      1 /* (by definition) */
  59 #define SC_COPROC_USE_COP1      2 /* FPA */
  60 #define SC_COPROC_USE_FPU       SC_COPROC_USE_COP1
  61 #define SC_COPROC_USE_COP2      4
  62 #define SC_COPROC_USE_COP3      8
  63
  64     /* struct mips_float_state
  65        This is only filled in if the SC_COPROC_USE_FPU bit
  66        is set in sc_coproc_used.  */
  67 #define sc_mips_float_state sc_fpr
  68     int sc_fpr[32];             /* FP registers.  */
  69     int sc_fpcsr;               /* FPU status register.  */
  70     int sc_fpeir;               /* FP exception instruction register.  */
  71   };