old-cross-binutils/gdb/config/m68k/tm-sun3.h

/* Parameters for execution on a Sun, for GDB, the GNU debugger.
   Copyright (C) 1986, 1987, 1989, 1992 Free Software Foundation, Inc.

This file is part of GDB.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* Let native-versus-cross support code know we are targeting sun3,
   and modify registers to include sun3 fpustate register.  */

#define GDB_TARGET_IS_SUN3 1

#include "m68k/tm-m68k.h"

/* Offsets (in target ints) into jmp_buf.  Not defined by Sun, but at least
   documented in a comment in <machine/setjmp.h>! */

#define JB_ELEMENT_SIZE 4

#define JB_ONSSTACK 0
#define JB_SIGMASK 1
#define JB_SP 2
#define JB_PC 3
#define JB_PSL 4
#define JB_D2 5
#define JB_D3 6
#define JB_D4 7
#define JB_D5 8
#define JB_D6 9
#define JB_D7 10
#define JB_A2 11
#define JB_A3 12
#define JB_A4 13
#define JB_A5 14
#define JB_A6 15

/* Figure out where the longjmp will land.  Slurp the args out of the stack.
   We expect the first arg to be a pointer to the jmp_buf structure from which
   we extract the pc (JB_PC) that we will land at.  The pc is copied into ADDR.
   This routine returns true on success */

#define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)

#undef SAVED_PC_AFTER_CALL

#ifdef __STDC__
struct frame_info;
#endif

extern CORE_ADDR m68k_saved_pc_after_call PARAMS ((struct frame_info *));

#define SAVED_PC_AFTER_CALL(frame) \
  m68k_saved_pc_after_call(frame)

/* Sun /bin/cc gets this right as of SunOS 4.1.x.  We need to define
   BELIEVE_PCC_PROMOTION to get this right now that the code which
   detects gcc2_compiled. is broken.  This loses for SunOS 4.0.x and
   earlier.  */

#define BELIEVE_PCC_PROMOTION 1

/* The code which tries to deal with this bug is never harmful on a sun3.  */
#define SUN_FIXED_LBRAC_BUG (0)

/* On the sun3 the kernel pushes a sigcontext on the user stack and then
   `calls' _sigtramp in user code. _sigtramp saves the floating point status
   on the stack and calls the signal handler function. The stack does not
   contain enough information to allow a normal backtrace, but sigcontext
   contains the saved user pc/sp. FRAME_CHAIN and friends in tm-m68k.h and
   m68k_find_saved_regs deal with this situation by manufacturing a fake frame
   for _sigtramp.
   SIG_PC_FP_OFFSET is the offset from the signal handler frame to the
   saved pc in sigcontext.
   SIG_SP_FP_OFFSET is the offset from the signal handler frame to the end
   of sigcontext which is identical to the saved sp at SIG_PC_FP_OFFSET - 4.

   Please note that it is impossible to correctly backtrace from a breakpoint
   in _sigtramp as _sigtramp modifies the stack pointer a few times.  */

#undef SIG_PC_FP_OFFSET
#define SIG_PC_FP_OFFSET 324
#define SIG_SP_FP_OFFSET 332