1 /* Parameters for execution on a Sun, for GDB, the GNU debugger.
2 Copyright (C) 1986, 1987, 1989, 1992 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
20 /* Let native-versus-cross support code know we are targeting sun3,
21 and modify registers to include sun3 fpustate register. */
23 #define GDB_TARGET_IS_SUN3 1
25 #include "m68k/tm-m68k.h"
27 /* Offsets (in target ints) into jmp_buf. Not defined by Sun, but at least
28 documented in a comment in <machine/setjmp.h>! */
30 #define JB_ELEMENT_SIZE 4
49 /* Figure out where the longjmp will land. Slurp the args out of the stack.
50 We expect the first arg to be a pointer to the jmp_buf structure from which
51 we extract the pc (JB_PC) that we will land at. The pc is copied into ADDR.
52 This routine returns true on success */
54 #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR)
56 #undef SAVED_PC_AFTER_CALL
62 extern CORE_ADDR m68k_saved_pc_after_call
PARAMS ((struct frame_info
*));
64 #define SAVED_PC_AFTER_CALL(frame) \
65 m68k_saved_pc_after_call(frame)
67 /* If sun3 pcc says that a parameter is a short, it's a short. */
68 #define BELIEVE_PCC_PROMOTION_TYPE
70 /* The code which tries to deal with this bug is never harmful on a sun3. */
71 #define SUN_FIXED_LBRAC_BUG (0)
73 /* On the sun3 the kernel pushes a sigcontext on the user stack and then
74 `calls' _sigtramp in user code. _sigtramp saves the floating point status
75 on the stack and calls the signal handler function. The stack does not
76 contain enough information to allow a normal backtrace, but sigcontext
77 contains the saved user pc/sp. FRAME_CHAIN and friends in tm-m68k.h and
78 m68k_find_saved_regs deal with this situation by manufacturing a fake frame
80 SIG_PC_FP_OFFSET is the offset from the signal handler frame to the
81 saved pc in sigcontext.
82 SIG_SP_FP_OFFSET is the offset from the signal handler frame to the end
83 of sigcontext which is identical to the saved sp at SIG_PC_FP_OFFSET - 4.
85 Please note that it is impossible to correctly backtrace from a breakpoint
86 in _sigtramp as _sigtramp modifies the stack pointer a few times. */
88 #undef SIG_PC_FP_OFFSET
89 #define SIG_PC_FP_OFFSET 324
90 #define SIG_SP_FP_OFFSET 332