110 lines
3.9 KiB
C
110 lines
3.9 KiB
C
/* Parameters for execution on a Sun, for GDB, the GNU debugger.
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Copyright 1986, 1987, 1989, 1992, 1993, 1994, 1996, 2000
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef TM_SUN3_H
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#define TM_SUN3_H
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/* Sun3 status includes fpflags, which shows whether the FPU has been used
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by the process, and whether the FPU was done with an instruction or
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was interrupted in the middle of a long instruction. See
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<machine/reg.h>. */
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/* a&d, pc,sr, fp, fpstat, fpflags */
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#define DEPRECATED_REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4 + 4)
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#define NUM_REGS 31
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#define REGISTER_BYTES_OK(b) \
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((b) == DEPRECATED_REGISTER_BYTES \
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|| (b) == REGISTER_BYTES_FP \
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|| (b) == REGISTER_BYTES_NOFP)
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/* If PC contains this instruction, then we know what we are in a system
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call stub, and the return PC is is at SP+4, instead of SP. */
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#define SYSCALL_TRAP 0x4e40 /* trap #0 */
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#define SYSCALL_TRAP_OFFSET 0 /* PC points at trap instruction */
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#include "m68k/tm-m68k.h"
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/* Disable alternate breakpoint mechanism needed by 68k stub. */
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#undef DEPRECATED_REMOTE_BREAKPOINT
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/* Offsets (in target ints) into jmp_buf. Not defined by Sun, but at least
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documented in a comment in <machine/setjmp.h>! */
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#define JB_ELEMENT_SIZE 4
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#define JB_ONSSTACK 0
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#define JB_SIGMASK 1
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#define JB_SP 2
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#define JB_PC 3
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#define JB_PSL 4
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#define JB_D2 5
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#define JB_D3 6
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#define JB_D4 7
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#define JB_D5 8
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#define JB_D6 9
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#define JB_D7 10
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#define JB_A2 11
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#define JB_A3 12
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#define JB_A4 13
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#define JB_A5 14
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#define JB_A6 15
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/* Figure out where the longjmp will land. Slurp the args out of the stack.
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We expect the first arg to be a pointer to the jmp_buf structure from which
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we extract the pc (JB_PC) that we will land at. The pc is copied into ADDR.
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This routine returns true on success */
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#define GET_LONGJMP_TARGET(ADDR) m68k_get_longjmp_target(ADDR)
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/* If sun3 pcc says that a parameter is a short, it's a short. */
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#define BELIEVE_PCC_PROMOTION_TYPE 1
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/* Can't define BELIEVE_PCC_PROMOTION for SunOS /bin/cc of SunOS 4.1.1.
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Apparently Sun fixed this for the sparc but not the sun3. */
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/* The code which tries to deal with this bug is never harmful on a sun3. */
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#define SUN_FIXED_LBRAC_BUG (0)
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/* On the sun3 the kernel pushes a sigcontext on the user stack and
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then `calls' _sigtramp in user code. _sigtramp saves the floating
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point status on the stack and calls the signal handler
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function. The stack does not contain enough information to allow a
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normal backtrace, but sigcontext contains the saved user
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pc/sp. DEPRECATED_FRAME_CHAIN and friends in tm-m68k.h and
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m68k_find_saved_regs deal with this situation by manufacturing a
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fake frame for _sigtramp. SIG_PC_FP_OFFSET is the offset from the
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signal handler frame to the saved pc in sigcontext.
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SIG_SP_FP_OFFSET is the offset from the signal handler frame to the
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end of sigcontext which is identical to the saved sp at
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SIG_PC_FP_OFFSET - 4.
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Please note that it is impossible to correctly backtrace from a breakpoint
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in _sigtramp as _sigtramp modifies the stack pointer a few times. */
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#undef SIG_PC_FP_OFFSET
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#define SIG_PC_FP_OFFSET 324
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#define SIG_SP_FP_OFFSET 332
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#endif /* TM_SUN3_H */
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