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1 | \ ========== Copyright Header Begin ========================================== |
2 | \ | |
3 | \ Hypervisor Software File: cpubpsup.fth | |
4 | \ | |
5 | \ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. | |
6 | \ | |
7 | \ - Do no alter or remove copyright notices | |
8 | \ | |
9 | \ - Redistribution and use of this software in source and binary forms, with | |
10 | \ or without modification, are permitted provided that the following | |
11 | \ conditions are met: | |
12 | \ | |
13 | \ - Redistribution of source code must retain the above copyright notice, | |
14 | \ this list of conditions and the following disclaimer. | |
15 | \ | |
16 | \ - Redistribution in binary form must reproduce the above copyright notice, | |
17 | \ this list of conditions and the following disclaimer in the | |
18 | \ documentation and/or other materials provided with the distribution. | |
19 | \ | |
20 | \ Neither the name of Sun Microsystems, Inc. or the names of contributors | |
21 | \ may be used to endorse or promote products derived from this software | |
22 | \ without specific prior written permission. | |
23 | \ | |
24 | \ This software is provided "AS IS," without a warranty of any kind. | |
25 | \ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, | |
26 | \ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A | |
27 | \ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN | |
28 | \ MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR | |
29 | \ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR | |
30 | \ DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN | |
31 | \ OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR | |
32 | \ FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE | |
33 | \ DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, | |
34 | \ ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF | |
35 | \ SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. | |
36 | \ | |
37 | \ You acknowledge that this software is not designed, licensed or | |
38 | \ intended for use in the design, construction, operation or maintenance of | |
39 | \ any nuclear facility. | |
40 | \ | |
41 | \ ========== Copyright Header End ============================================ | |
42 | \ cpubpsup.fth 2.10 97/07/17 | |
43 | \ Copyright 1985-1990 Bradley Forthware | |
44 | \ SPARC-specific breakpoint support routines. | |
45 | ||
46 | \ Processor-dependent definitions for breakpoints on the SPARC | |
47 | ||
48 | headerless | |
49 | 0 value breakpoint-opcode | |
50 | defer breakpoint-trap? | |
51 | ||
52 | headers | |
53 | defer op! | |
54 | defer op@ | |
55 | ||
56 | : .instruction ( -- ) %pc [ disassembler ] pc! dis1 ; | |
57 | ||
58 | headerless | |
59 | : bp-address-valid? ( adr -- flag ) 3 and 0= ; | |
60 | : at-breakpoint? ( adr -- flag ) op@ breakpoint-opcode = ; | |
61 | : put-breakpoint ( adr -- ) breakpoint-opcode swap op! ; | |
62 | ||
63 | \ Find the places to set the next breakpoint for single stepping. | |
64 | \ Usually the right place is at nPC . However, for annulled branch | |
65 | \ instructions, we have to cope with the possibility that the delay | |
66 | \ instruction, which is where nPC points, won't be executed. Annulled | |
67 | \ unconditional branches never execute the delay instruction, so we have | |
68 | \ to put the breakpoint at the branch target. Annulled conditional | |
69 | \ branches will either execute the delay instruction or the one right | |
70 | \ after it. | |
71 | ||
72 | : disp16 ( opcode -- disp16 ) | |
73 | dup h# 3fff and swap 3 d# 20 lshift and 6 rshift or | |
74 | dup h# 8000 and if h# ffff.0000 or then | |
75 | ; | |
76 | : disp19 ( opcode -- disp19 ) | |
77 | h# 07.ffff and | |
78 | dup h# 04.0000 and if h# fff8.0000 or then | |
79 | ; | |
80 | : disp22 ( opcode -- disp22 ) | |
81 | h# 003f.ffff and | |
82 | dup h# 20.0000 and if h# ffc0.0000 or then | |
83 | ; | |
84 | ||
85 | : next-instruction ( stepping? -- next-adr branch-target|0 ) | |
86 | 0= if %pc la1+ 0 exit then \ May not work for annulled branches | |
87 | %pc op@ ( opcode ) | |
88 | \ not format 2 (op=0) | |
89 | dup h# c000.0000 and ( opcode flag1 ) | |
90 | \ sethi | |
91 | over h# 01c0.0000 and h# 0100.0000 = or ( opcode flag2 ) | |
92 | \ non an annulled branch | |
93 | over h# 2000.0000 and 0= or if ( opcode ) | |
94 | drop %npc 0 exit | |
95 | then ( opcode ) | |
96 | ||
97 | dup h# 1e00.0000 and h# 1000.0000 <> if ( opcode ) | |
98 | \ It's a conditional branch | |
99 | drop %npc %npc 4 + exit | |
100 | then ( opcode ) | |
101 | ||
102 | \ Unconditional branch. Need branch offset ( opcode ) | |
103 | dup h# 01c0.0000 and d# 22 rshift case ( opcode op2 ) | |
104 | b# 011 of disp16 endof | |
105 | b# 101 of disp19 endof | |
106 | b# 001 of disp19 endof | |
107 | \ default | |
108 | ( opcode op2 ) | |
109 | swap disp22 swap ( disp22 op2 ) | |
110 | endcase ( dispXX ) | |
111 | 2 lshift l->n %pc + 0 ( branch-target 0 ) | |
112 | ; | |
113 | headers | |
114 | : bumppc ( -- ) %pc la1+ to %pc %pc la1+ to %npc ; | |
115 | alias rpc %pc | |
116 | ||
117 | code goto ( adr -- ) | |
118 | tos scr move | |
119 | sp tos get | |
120 | scr %g0 %g0 jmpl | |
121 | sp /n sp add | |
122 | end-code | |
123 | ||
124 | headerless | |
125 | : return-adr ( -- adr ) 0 w %i7 8 + ; | |
126 | : leaf-return-adr ( -- adr ) 0 w %o7 8 + ; | |
127 | : backward-branch? ( adr -- flag ) \ True if adr points to a backward branch | |
128 | l@ ( instruction ) | |
129 | dup h# c000.0000 and 0= ( instruction flag ) \ Must be format 0 | |
130 | over h# 01c0.0000 and case \ Must be a branch | |
131 | h# 0080.0000 of true endof \ bcc | |
132 | h# 0180.0000 of true endof \ bfcc | |
133 | h# 01c0.0000 of true endof \ bccc | |
134 | ( else ) false swap | |
135 | endcase and ( instruction flag ) | |
136 | swap h# 0020.0000 and 0<> and ( flag ) \ Offset must be < 0 | |
137 | ; | |
138 | : loop-exit-adr ( -- adr ) | |
139 | \ Start at PC-4 in case we're sitting on a delay instruction at the loop end | |
140 | %pc 4 - begin dup backward-branch? 0= while 4 + repeat 8 + | |
141 | ; | |
142 | ||
143 | headers | |
144 | : set-pc ( adr -- ) dup to %pc 4 + to %npc ; |