home *** CD-ROM | disk | FTP | other *** search
- /* 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. */
-
- #ifndef TM_SUN3_H
- #define TM_SUN3_H
-
- /* Sun3 status includes fpflags, which shows whether the FPU has been used
- by the process, and whether the FPU was done with an instruction or
- was interrupted in the middle of a long instruction. See
- <machine/reg.h>. */
- /* a&d, pc,sr, fp, fpstat, fpflags */
-
- #define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4 + 4)
-
- #define NUM_REGS 31
-
- #define REGISTER_BYTES_OK(b) \
- ((b) == REGISTER_BYTES \
- || (b) == REGISTER_BYTES_FP \
- || (b) == REGISTER_BYTES_NOFP)
-
- /* If PC contains this instruction, then we know what we are in a system
- call stub, and the return PC is is at SP+4, instead of SP. */
-
- #define SYSCALL_TRAP 0x4e40 /* trap #0 */
- #define SYSCALL_TRAP_OFFSET 0 /* PC points at trap instruction */
-
- #include "m68k/tm-m68k.h"
-
- /* Disable alternate breakpoint mechanism needed by 68k stub. */
- #undef REMOTE_BREAKPOINT
-
- /* 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)
-
- /* If sun3 pcc says that a parameter is a short, it's a short. */
- #define BELIEVE_PCC_PROMOTION_TYPE
-
- /* Can't define BELIEVE_PCC_PROMOTION for SunOS /bin/cc of SunOS 4.1.1.
- Apparently Sun fixed this for the sparc but not the sun3. */
-
- /* 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
-
- #endif /* TM_SUN3_H */
-