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c906108c SS |
1 | /* Parameters for execution on a Sun, for GDB, the GNU debugger. |
2 | Copyright (C) 1986, 1987, 1989, 1992 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
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. | |
c906108c | 10 | |
c5aa993b JM |
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. | |
c906108c | 15 | |
c5aa993b JM |
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., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #ifndef TM_SUN3_H | |
22 | #define TM_SUN3_H | |
23 | ||
24 | /* Sun3 status includes fpflags, which shows whether the FPU has been used | |
25 | by the process, and whether the FPU was done with an instruction or | |
26 | was interrupted in the middle of a long instruction. See | |
27 | <machine/reg.h>. */ | |
28 | /* a&d, pc,sr, fp, fpstat, fpflags */ | |
29 | ||
30 | #define REGISTER_BYTES (16*4 + 8 + 8*12 + 3*4 + 4) | |
31 | ||
32 | #define NUM_REGS 31 | |
33 | ||
34 | #define REGISTER_BYTES_OK(b) \ | |
35 | ((b) == REGISTER_BYTES \ | |
36 | || (b) == REGISTER_BYTES_FP \ | |
37 | || (b) == REGISTER_BYTES_NOFP) | |
38 | ||
39 | /* If PC contains this instruction, then we know what we are in a system | |
40 | call stub, and the return PC is is at SP+4, instead of SP. */ | |
41 | ||
42 | #define SYSCALL_TRAP 0x4e40 /* trap #0 */ | |
43 | #define SYSCALL_TRAP_OFFSET 0 /* PC points at trap instruction */ | |
44 | ||
45 | #include "m68k/tm-m68k.h" | |
46 | ||
47 | /* Disable alternate breakpoint mechanism needed by 68k stub. */ | |
48 | #undef REMOTE_BREAKPOINT | |
49 | ||
50 | /* Offsets (in target ints) into jmp_buf. Not defined by Sun, but at least | |
51 | documented in a comment in <machine/setjmp.h>! */ | |
52 | ||
53 | #define JB_ELEMENT_SIZE 4 | |
54 | ||
55 | #define JB_ONSSTACK 0 | |
56 | #define JB_SIGMASK 1 | |
57 | #define JB_SP 2 | |
58 | #define JB_PC 3 | |
59 | #define JB_PSL 4 | |
60 | #define JB_D2 5 | |
61 | #define JB_D3 6 | |
62 | #define JB_D4 7 | |
63 | #define JB_D5 8 | |
64 | #define JB_D6 9 | |
65 | #define JB_D7 10 | |
66 | #define JB_A2 11 | |
67 | #define JB_A3 12 | |
68 | #define JB_A4 13 | |
69 | #define JB_A5 14 | |
70 | #define JB_A6 15 | |
71 | ||
72 | /* Figure out where the longjmp will land. Slurp the args out of the stack. | |
73 | We expect the first arg to be a pointer to the jmp_buf structure from which | |
74 | we extract the pc (JB_PC) that we will land at. The pc is copied into ADDR. | |
75 | This routine returns true on success */ | |
76 | ||
77 | #define GET_LONGJMP_TARGET(ADDR) get_longjmp_target(ADDR) | |
78 | extern int get_longjmp_target PARAMS ((CORE_ADDR *)); | |
79 | ||
80 | /* If sun3 pcc says that a parameter is a short, it's a short. */ | |
81 | #define BELIEVE_PCC_PROMOTION_TYPE | |
82 | ||
83 | /* Can't define BELIEVE_PCC_PROMOTION for SunOS /bin/cc of SunOS 4.1.1. | |
84 | Apparently Sun fixed this for the sparc but not the sun3. */ | |
85 | ||
86 | /* The code which tries to deal with this bug is never harmful on a sun3. */ | |
87 | #define SUN_FIXED_LBRAC_BUG (0) | |
88 | ||
89 | /* On the sun3 the kernel pushes a sigcontext on the user stack and then | |
90 | `calls' _sigtramp in user code. _sigtramp saves the floating point status | |
91 | on the stack and calls the signal handler function. The stack does not | |
92 | contain enough information to allow a normal backtrace, but sigcontext | |
93 | contains the saved user pc/sp. FRAME_CHAIN and friends in tm-m68k.h and | |
94 | m68k_find_saved_regs deal with this situation by manufacturing a fake frame | |
95 | for _sigtramp. | |
96 | SIG_PC_FP_OFFSET is the offset from the signal handler frame to the | |
97 | saved pc in sigcontext. | |
98 | SIG_SP_FP_OFFSET is the offset from the signal handler frame to the end | |
99 | of sigcontext which is identical to the saved sp at SIG_PC_FP_OFFSET - 4. | |
100 | ||
101 | Please note that it is impossible to correctly backtrace from a breakpoint | |
102 | in _sigtramp as _sigtramp modifies the stack pointer a few times. */ | |
103 | ||
104 | #undef SIG_PC_FP_OFFSET | |
105 | #define SIG_PC_FP_OFFSET 324 | |
106 | #define SIG_SP_FP_OFFSET 332 | |
107 | ||
108 | #endif /* TM_SUN3_H */ |