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1 | /* Parameters for execution on a Sony/NEWS, for GDB, the GNU debugger. |
2 | Copyright (C) 1987, 1989 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GDB. | |
5 | ||
99a7de40 | 6 | This program is free software; you can redistribute it and/or modify |
dd3b648e | 7 | it under the terms of the GNU General Public License as published by |
99a7de40 JG |
8 | the Free Software Foundation; either version 2 of the License, or |
9 | (at your option) any later version. | |
dd3b648e | 10 | |
99a7de40 | 11 | This program is distributed in the hope that it will be useful, |
dd3b648e RP |
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. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
99a7de40 JG |
17 | along with this program; if not, write to the Free Software |
18 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
dd3b648e RP |
19 | |
20 | /* See following cpu type determination macro to get the machine type. | |
21 | ||
22 | Here is an m-news.h file for gdb. It supports the 68881 registers. | |
23 | by [email protected] | |
24 | ||
25 | * Support Sun assembly format instead of Motorola one. | |
26 | * Ptrace for handling floating register has a bug(before NEWS OS version 2.2), | |
27 | * After NEWS OS version 3.2, some of ptrace's bug is fixed. | |
28 | But we cannot change the floating register(see adb(1) in OS 3.2) yet. */ | |
29 | ||
30 | /* Define this if the C compiler puts an underscore at the front | |
31 | of external names before giving them to the linker. */ | |
32 | ||
33 | #define NAMES_HAVE_UNDERSCORE | |
34 | ||
35 | /* Symbols on this machine are in DBX format. */ | |
36 | #define READ_DBX_FORMAT | |
37 | ||
38 | /* Use to compute STACK_END_ADDR. */ | |
39 | #define TARGET_UPAGES 2 | |
40 | #define TARGET_NBPG 4096 | |
41 | ||
42 | /* Address of end of stack space. */ | |
43 | ||
44 | #define STACK_END_ADDR (0x80000000 - TARGET_UPAGES * TARGET_NBPG) | |
45 | ||
46 | /* Extract from an array REGBUF containing the (raw) register state | |
47 | a function return value of type TYPE, and copy that, in virtual format, | |
48 | into VALBUF. */ | |
49 | ||
50 | /* when it return the floating value, use the FP0 in NEWS. */ | |
51 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
52 | { if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \ | |
53 | { \ | |
54 | REGISTER_CONVERT_TO_VIRTUAL (FP0_REGNUM, \ | |
55 | ®BUF[REGISTER_BYTE (FP0_REGNUM)], VALBUF); \ | |
56 | } \ | |
57 | else \ | |
58 | bcopy (REGBUF, VALBUF, TYPE_LENGTH (TYPE)); } | |
59 | ||
60 | /* Write into appropriate registers a function return value | |
61 | of type TYPE, given in virtual format. */ | |
62 | ||
63 | /* when it return the floating value, use the FP0 in NEWS. */ | |
64 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
65 | { if (TYPE_CODE (TYPE) == TYPE_CODE_FLT) \ | |
66 | { \ | |
67 | char raw_buf[REGISTER_RAW_SIZE (FP0_REGNUM)]; \ | |
68 | REGISTER_CONVERT_TO_RAW (FP0_REGNUM, VALBUF, raw_buf); \ | |
69 | write_register_bytes (FP0_REGNUM, \ | |
70 | raw_buf, REGISTER_RAW_SIZE (FP0_REGNUM)); \ | |
71 | } \ | |
72 | else \ | |
73 | write_register_bytes (0, VALBUF, TYPE_LENGTH (TYPE)); } | |
74 | ||
75 | /* Return number of args passed to a frame. | |
76 | Can return -1, meaning no way to tell. */ | |
77 | ||
78 | #define FRAME_NUM_ARGS(val, fi) \ | |
79 | { register CORE_ADDR pc = FRAME_SAVED_PC (fi); \ | |
80 | register int insn = 0177777 & read_memory_integer (pc, 2); \ | |
81 | val = 0; \ | |
82 | if (insn == 0047757 || insn == 0157374) /* lea W(sp),sp or addaw #W,sp */ \ | |
83 | val = read_memory_integer (pc + 2, 2); \ | |
84 | else if ((insn & 0170777) == 0050217 /* addql #N, sp */ \ | |
85 | || (insn & 0170777) == 0050117) /* addqw */ \ | |
86 | { val = (insn >> 9) & 7; if (val == 0) val = 8; } \ | |
87 | else if (insn == 0157774) /* addal #WW, sp */ \ | |
88 | val = read_memory_integer (pc + 2, 4); \ | |
89 | val >>= 2; } | |
90 | ||
91 | /* Things needed for making the inferior call functions. */ | |
92 | #define PUSH_DUMMY_FRAME \ | |
93 | { register CORE_ADDR sp = read_register (SP_REGNUM); \ | |
94 | register int regnum; \ | |
95 | char raw_buffer[12]; \ | |
96 | sp = push_word (sp, read_register (PC_REGNUM)); \ | |
97 | sp = push_word (sp, read_register (FP_REGNUM)); \ | |
98 | write_register (FP_REGNUM, sp); \ | |
99 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \ | |
100 | { read_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); \ | |
101 | sp = push_bytes (sp, raw_buffer, 12); } \ | |
102 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \ | |
103 | sp = push_word (sp, read_register (regnum)); \ | |
104 | sp = push_word (sp, read_register (PS_REGNUM)); \ | |
105 | write_register (SP_REGNUM, sp); } | |
106 | ||
107 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
108 | ||
109 | #define POP_FRAME \ | |
110 | { register FRAME frame = get_current_frame (); \ | |
111 | register CORE_ADDR fp; \ | |
112 | register int regnum; \ | |
113 | struct frame_saved_regs fsr; \ | |
114 | struct frame_info *fi; \ | |
115 | char raw_buffer[12]; \ | |
116 | fi = get_frame_info (frame); \ | |
117 | fp = fi->frame; \ | |
118 | get_frame_saved_regs (fi, &fsr); \ | |
119 | for (regnum = FP0_REGNUM + 7; regnum >= FP0_REGNUM; regnum--) \ | |
120 | if (fsr.regs[regnum]) \ | |
121 | { read_memory (fsr.regs[regnum], raw_buffer, 12); \ | |
122 | write_register_bytes (REGISTER_BYTE (regnum), raw_buffer, 12); }\ | |
123 | for (regnum = FP_REGNUM - 1; regnum >= 0; regnum--) \ | |
124 | if (fsr.regs[regnum]) \ | |
125 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \ | |
126 | if (fsr.regs[PS_REGNUM]) \ | |
127 | write_register (PS_REGNUM, read_memory_integer (fsr.regs[PS_REGNUM], 4)); \ | |
128 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); \ | |
129 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \ | |
130 | write_register (SP_REGNUM, fp + 8); \ | |
131 | flush_cached_frames (); \ | |
132 | set_current_frame (create_new_frame (read_register (FP_REGNUM), \ | |
133 | read_pc ())); } | |
134 | ||
135 | /* This sequence of words is the instructions | |
136 | fmove.m #<f0-f7>,-(sp) | |
137 | movem.l 0xfffc,-(sp) ;; no save a6(fp) and a7(sp) | |
138 | clr.w -(sp) | |
139 | move.w ccr,-(sp) | |
140 | /..* The arguments are pushed at this point by GDB; | |
141 | no code is needed in the dummy for this. | |
142 | The CALL_DUMMY_START_OFFSET gives the position of | |
143 | the following jsr instruction. *../ | |
144 | jbsr (#32323232) | |
145 | add.l #69696969,sp | |
146 | bpt | |
147 | nop | |
148 | Note this is 24 bytes. | |
149 | We actually start executing at the jsr, since the pushing of the | |
150 | registers is done by PUSH_DUMMY_FRAME. If this were real code, | |
151 | the arguments for the function called by the jsr would be pushed | |
152 | between the moveml and the jsr, and we could allow it to execute through. | |
153 | But the arguments have to be pushed by GDB after the PUSH_DUMMY_FRAME is done, | |
154 | and we cannot allow the moveml to push the registers again lest they be | |
155 | taken for the arguments. */ | |
156 | ||
157 | #define CALL_DUMMY {0xf227e0ff, 0x48e7fffc, 0x426742e7, 0x4eb93232, 0x3232dffc, 0x69696969, 0x4e4f4e71} | |
158 | ||
159 | #define CALL_DUMMY_LENGTH 28 | |
160 | ||
161 | #define CALL_DUMMY_START_OFFSET 12 | |
162 | ||
163 | /* Insert the specified number of args and function address | |
164 | into a call sequence of the above form stored at DUMMYNAME. */ | |
165 | ||
166 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ | |
167 | { *(int *)((char *) dummyname + 20) = nargs * 4; \ | |
168 | *(int *)((char *) dummyname + 14) = fun; } | |
169 | \f | |
170 | #define HAVE_68881 | |
171 | ||
172 | #include "tm-68k.h" |