1 /* Print NS 32000 instructions for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1991, 1992, 1994, 1995
3 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
25 _initialize_ns32k_tdep ()
27 tm_print_insn
= print_insn_ns32k
;
30 /* Advance PC across any function entry prologue instructions
31 to reach some "real" code. */
34 merlin_skip_prologue (pc
)
37 register int op
= read_memory_integer (pc
, 1);
40 op
= read_memory_integer (pc
+ 2, 1);
43 else if ((op
& 0xc0) == 0x80)
52 umax_skip_prologue (pc
)
55 register unsigned char op
= read_memory_integer (pc
, 1);
58 op
= read_memory_integer (pc
+ 2, 1);
61 else if ((op
& 0xc0) == 0x80)
69 /* Return number of args passed to a frame.
70 Can return -1, meaning no way to tell. */
73 merlin_frame_num_args (fi
)
74 struct frame_info
*fi
;
82 pc
= FRAME_SAVED_PC (fi
);
83 insn
= read_memory_integer (pc
, 2);
84 addr_mode
= (insn
>> 11) & 0x1f;
86 if ((insn
& 0x7fc) == 0x57c
87 && addr_mode
== 0x14) /* immediate */
89 if (insn
== 0x57c) /* adjspb */
91 else if (insn
== 0x57d) /* adjspw */
93 else if (insn
== 0x57f) /* adjspd */
95 numargs
= read_memory_integer (pc
+ 2, width
);
97 flip_bytes (&numargs
, width
);
98 numargs
= -sign_extend (numargs
, width
* 8) / 4;
106 /* Return number of args passed to a frame.
107 Can return -1, meaning no way to tell.
108 Encore's C compiler often reuses same area on stack for args,
109 so this will often not work properly. If the arg names
110 are known, it's likely most of them will be printed. */
112 umax_frame_num_args (fi
)
113 struct frame_info
*fi
;
117 CORE_ADDR enter_addr
;
119 unsigned int addr_mode
;
123 enter_addr
= ns32k_get_enter_addr ((fi
)->pc
);
126 pc
= ((enter_addr
== 1)
127 ? SAVED_PC_AFTER_CALL (fi
)
128 : FRAME_SAVED_PC (fi
));
129 insn
= read_memory_integer (pc
, 2);
130 addr_mode
= (insn
>> 11) & 0x1f;
132 if ((insn
& 0x7fc) == 0x57c
133 && addr_mode
== 0x14) /* immediate */
135 if (insn
== 0x57c) /* adjspb */
137 else if (insn
== 0x57d) /* adjspw */
139 else if (insn
== 0x57f) /* adjspd */
141 numargs
= read_memory_integer (pc
+ 2, width
);
143 flip_bytes (&numargs
, width
);
144 numargs
= -sign_extend (numargs
, width
* 8) / 4;
151 sign_extend (value
, bits
)
153 value
= value
& ((1 << bits
) - 1);
154 return (value
& (1 << (bits
- 1))
155 ? value
| (~((1 << bits
) - 1))
160 flip_bytes (ptr
, count
)
169 ptr
[0] = ptr
[count
- 1];
170 ptr
[count
- 1] = tmp
;
176 /* Return the number of locals in the current frame given a pc
177 pointing to the enter instruction. This is used in the macro
178 FRAME_FIND_SAVED_REGS. */
181 ns32k_localcount (enter_pc
)
184 unsigned char localtype
;
187 localtype
= read_memory_integer (enter_pc
+ 2, 1);
188 if ((localtype
& 0x80) == 0)
189 localcount
= localtype
;
190 else if ((localtype
& 0xc0) == 0x80)
191 localcount
= (((localtype
& 0x3f) << 8)
192 | (read_memory_integer (enter_pc
+ 3, 1) & 0xff));
194 localcount
= (((localtype
& 0x3f) << 24)
195 | ((read_memory_integer (enter_pc
+ 3, 1) & 0xff) << 16)
196 | ((read_memory_integer (enter_pc
+ 4, 1) & 0xff) << 8)
197 | (read_memory_integer (enter_pc
+ 5, 1) & 0xff));
202 /* Nonzero if instruction at PC is a return instruction. */
205 ns32k_about_to_return (pc
)
208 return (read_memory_integer (pc
, 1) == 0x12);
213 * Get the address of the enter opcode for the function
214 * containing PC, if there is an enter for the function,
215 * and if the pc is between the enter and exit.
216 * Returns positive address if pc is between enter/exit,
217 * 1 if pc before enter or after exit, 0 otherwise.
221 ns32k_get_enter_addr (pc
)
224 CORE_ADDR enter_addr
;
230 if (ns32k_about_to_return (pc
))
231 return 1; /* after exit */
233 enter_addr
= get_pc_function_start (pc
);
235 if (pc
== enter_addr
)
236 return 1; /* before enter */
238 op
= read_memory_integer (enter_addr
, 1);
241 return 0; /* function has no enter/exit */
243 return enter_addr
; /* pc is between enter and exit */
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