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, Boston, MA 02111-1307, USA. */
24 _initialize_ns32k_tdep ()
26 tm_print_insn
= print_insn_ns32k
;
29 /* Advance PC across any function entry prologue instructions
30 to reach some "real" code. */
33 merlin_skip_prologue (pc
)
36 register int op
= read_memory_integer (pc
, 1);
39 op
= read_memory_integer (pc
+2,1);
42 else if ((op
& 0xc0) == 0x80)
50 umax_skip_prologue (pc
)
53 register unsigned char op
= read_memory_integer (pc
, 1);
56 op
= read_memory_integer (pc
+2,1);
59 else if ((op
& 0xc0) == 0x80)
69 sign_extend (value
, bits
)
71 value
= value
& ((1 << bits
) - 1);
72 return (value
& (1 << (bits
-1))
73 ? value
| (~((1 << bits
) - 1))
78 flip_bytes (ptr
, count
)
87 ptr
[0] = ptr
[count
-1];
94 /* Return the number of locals in the current frame given a pc
95 pointing to the enter instruction. This is used in the macro
96 FRAME_FIND_SAVED_REGS. */
99 ns32k_localcount (enter_pc
)
102 unsigned char localtype
;
105 localtype
= read_memory_integer (enter_pc
+2, 1);
106 if ((localtype
& 0x80) == 0)
107 localcount
= localtype
;
108 else if ((localtype
& 0xc0) == 0x80)
109 localcount
= (((localtype
& 0x3f) << 8)
110 | (read_memory_integer (enter_pc
+3, 1) & 0xff));
112 localcount
= (((localtype
& 0x3f) << 24)
113 | ((read_memory_integer (enter_pc
+3, 1) & 0xff) << 16)
114 | ((read_memory_integer (enter_pc
+4, 1) & 0xff) << 8 )
115 | (read_memory_integer (enter_pc
+5, 1) & 0xff));
120 /* Nonzero if instruction at PC is a return instruction. */
123 ns32k_about_to_return (pc
)
126 return (read_memory_integer (pc
, 1) == 0x12);
131 * Get the address of the enter opcode for the function
132 * containing PC, if there is an enter for the function,
133 * and if the pc is between the enter and exit.
134 * Returns positive address if pc is between enter/exit,
135 * 1 if pc before enter or after exit, 0 otherwise.
139 ns32k_get_enter_addr (pc
)
142 CORE_ADDR enter_addr
;
148 if (ns32k_about_to_return (pc
))
149 return 1; /* after exit */
151 enter_addr
= get_pc_function_start (pc
);
153 if (pc
== enter_addr
)
154 return 1; /* before enter */
156 op
= read_memory_integer (enter_addr
, 1);
159 return 0; /* function has no enter/exit */
161 return enter_addr
; /* pc is between enter and exit */