1 /* Print NS 32000 instructions for GDB, the GNU debugger.
2 Copyright 1986, 1988, 1991, 1992, 1994, 1995, 1998, 1999, 2000, 2001
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. */
26 static int sign_extend (int value
, int bits
);
29 _initialize_ns32k_tdep (void)
31 tm_print_insn
= print_insn_ns32k
;
34 /* Advance PC across any function entry prologue instructions
35 to reach some "real" code. */
38 umax_skip_prologue (CORE_ADDR pc
)
40 register unsigned char op
= read_memory_integer (pc
, 1);
43 op
= read_memory_integer (pc
+ 2, 1);
46 else if ((op
& 0xc0) == 0x80)
54 /* Return number of args passed to a frame.
55 Can return -1, meaning no way to tell.
56 Encore's C compiler often reuses same area on stack for args,
57 so this will often not work properly. If the arg names
58 are known, it's likely most of them will be printed. */
61 umax_frame_num_args (struct frame_info
*fi
)
67 unsigned int addr_mode
;
71 enter_addr
= ns32k_get_enter_addr ((fi
)->pc
);
74 pc
= ((enter_addr
== 1)
75 ? SAVED_PC_AFTER_CALL (fi
)
76 : FRAME_SAVED_PC (fi
));
77 insn
= read_memory_integer (pc
, 2);
78 addr_mode
= (insn
>> 11) & 0x1f;
80 if ((insn
& 0x7fc) == 0x57c
81 && addr_mode
== 0x14) /* immediate */
83 if (insn
== 0x57c) /* adjspb */
85 else if (insn
== 0x57d) /* adjspw */
87 else if (insn
== 0x57f) /* adjspd */
90 internal_error (__FILE__
, __LINE__
, "bad else");
91 numargs
= read_memory_integer (pc
+ 2, width
);
93 flip_bytes (&numargs
, width
);
94 numargs
= -sign_extend (numargs
, width
* 8) / 4;
101 sign_extend (int value
, int bits
)
103 value
= value
& ((1 << bits
) - 1);
104 return (value
& (1 << (bits
- 1))
105 ? value
| (~((1 << bits
) - 1))
110 flip_bytes (void *p
, int count
)
118 ptr
[0] = ptr
[count
- 1];
119 ptr
[count
- 1] = tmp
;
125 /* Return the number of locals in the current frame given a pc
126 pointing to the enter instruction. This is used in the macro
127 FRAME_FIND_SAVED_REGS. */
130 ns32k_localcount (CORE_ADDR enter_pc
)
132 unsigned char localtype
;
135 localtype
= read_memory_integer (enter_pc
+ 2, 1);
136 if ((localtype
& 0x80) == 0)
137 localcount
= localtype
;
138 else if ((localtype
& 0xc0) == 0x80)
139 localcount
= (((localtype
& 0x3f) << 8)
140 | (read_memory_integer (enter_pc
+ 3, 1) & 0xff));
142 localcount
= (((localtype
& 0x3f) << 24)
143 | ((read_memory_integer (enter_pc
+ 3, 1) & 0xff) << 16)
144 | ((read_memory_integer (enter_pc
+ 4, 1) & 0xff) << 8)
145 | (read_memory_integer (enter_pc
+ 5, 1) & 0xff));
150 /* Nonzero if instruction at PC is a return instruction. */
153 ns32k_about_to_return (CORE_ADDR pc
)
155 return (read_memory_integer (pc
, 1) == 0x12);
160 * Get the address of the enter opcode for the function
161 * containing PC, if there is an enter for the function,
162 * and if the pc is between the enter and exit.
163 * Returns positive address if pc is between enter/exit,
164 * 1 if pc before enter or after exit, 0 otherwise.
168 ns32k_get_enter_addr (CORE_ADDR pc
)
170 CORE_ADDR enter_addr
;
176 if (ns32k_about_to_return (pc
))
177 return 1; /* after exit */
179 enter_addr
= get_pc_function_start (pc
);
181 if (pc
== enter_addr
)
182 return 1; /* before enter */
184 op
= read_memory_integer (enter_addr
, 1);
187 return 0; /* function has no enter/exit */
189 return enter_addr
; /* pc is between enter and exit */
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