bitfields.isa revision 2239 
1// -*- mode:c++ -*-
2
3////////////////////////////////////////////////////////////////////
4//
5// Bitfield definitions.
6//
7
8def bitfield OPCODE     <31:26>;
9def bitfield OPCODE_HI  <31:29>;
10def bitfield OPCODE_LO  <28:26>;
11
12def bitfield REGIMM      <20:16>;
13def bitfield REGIMM_HI   <20:19>;
14def bitfield REGIMM_LO   <18:16>;
15
16def bitfield FUNCTION      < 5: 0>;
17def bitfield FUNCTION_HI   < 5: 3>;
18def bitfield FUNCTION_LO   < 2: 0>;
19
20// Integer operate format
21def bitfield RT	      <20:16>;
22def bitfield RT_HI    <20:19>;
23def bitfield RT_LO    <18:16>;
24
25def bitfield RS	      <25:21>;
26def bitfield RS_MSB   <25:25>;
27def bitfield RS_HI    <25:24>;
28def bitfield RS_LO    <23:21>;
29
30def bitfield RD	      <15:11>;
31
32def bitfield INTIMM	<15: 0>; // integer immediate (literal)
33
34// Floating-point operate format
35def bitfield FMT      <25:21>;
36def bitfield FR       <25:21>;
37def bitfield FT	      <20:16>;
38def bitfield FS	      <15:11>;
39def bitfield FD	      <10:6>;
40
41def bitfield CC       <20:18>;
42def bitfield ND       <17:17>;
43def bitfield TF       <16:16>;
44def bitfield MOVCI    <16:16>;
45def bitfield MOVCF    <16:16>;
46def bitfield SRL      <21:21>;
47def bitfield SRLV     < 6: 6>;
48def bitfield SA       <10: 6>;
49
50// CP0 Register Select
51def bitfield SEL       < 2: 0>;
52
53// Interrupts
54def bitfield SC       < 5: 5>;
55
56// Branch format
57def bitfield OFFSET <15: 0>; // displacement
58
59// Jmp format
60def bitfield JMPTARG	<25: 0>;
61def bitfield HINT	<10: 6>;
62
63def bitfield SYSCALLCODE <25: 6>;
64def bitfield TRAPCODE    <15:13>;
65
66// M5 instructions
67def bitfield M5FUNC <7:0>;
68