1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
|
#include <u.h>
#include <libc.h>
#include <bio.h>
#include <mach.h>
#define Extern extern
#include "power.h"
void mcrf(ulong);
void bclr(ulong);
void crop(ulong);
void bcctr(ulong);
void call(ulong);
void ret(ulong);
void isync(ulong);
Inst op19[] = {
[0] {mcrf, "mcrf", Ibranch},
[16] {bclr, "bclr", Ibranch},
[33] {crop, "crnor", Ibranch},
[15] {0, "rfi", Ibranch},
[129] {crop, "crandc", Ibranch},
[150] {isync, "isync", Ibranch},
[193] {crop, "crxor", Ibranch},
[225] {crop, "crnand", Ibranch},
[257] {crop, "crand", Ibranch},
[289] {crop, "creqv", Ibranch},
[417] {crop, "crorc", Ibranch},
[449] {crop, "cror", Ibranch},
[528] {bcctr, "bcctr", Ibranch},
{0, 0, 0}
};
Inset ops19 = {op19, nelem(op19)-1};
static char *
boname(int bo)
{
static char buf[8];
switch(bo>>1){
case 0: return "dnzf";
case 1: return "dzf";
case 2: return "f";
case 4: return "dnzt";
case 5: return "dzt";
case 6: return "t";
case 8: return "dnz";
case 9: return "dz";
case 10: return "a";
default:
sprint(buf, "%d?", bo);
return buf;
}
}
static char *
cname(int bo, int bi)
{
int f;
char *p;
static char buf[20];
static char *f0[] = {"lt", "gt", "eq", "so/un"};
if(bo == 0x14){ /* branch always */
sprint(buf,"%d", bi);
return buf;
}
for(f = 0; bi >= 4; bi -= 4)
f++;
p = buf;
p += sprint(buf, "%d[", bi);
if(f)
p += sprint(buf, "cr%d+", f);
strcpy(p, f0[bi&3]);
strcat(p, "]");
return buf;
}
static int
condok(ulong ir, int ctr)
{
int bo, bi, xx;
getbobi(ir);
if(xx)
undef(ir);
if((bo & 0x4) == 0) {
if(!ctr)
undef(ir);
reg.ctr--;
}
if(bo & 0x4 || (reg.ctr!=0)^((bo>>1)&1)) {
if(bo & 0x10 || (((reg.cr & bits[bi])!=0)==((bo>>3)&1)))
return 1;
}
return 0;
}
static void
dobranch(ulong ir, ulong *r, int ctr)
{
int bo, bi, xx;
ulong nia;
getbobi(ir);
USED(xx);
if(condok(ir, ctr)) {
ci->taken++;
nia = *r & ~3;
if(bo & 4) /* assume counting branches aren't returns */
ret(nia);
} else
nia = reg.pc + 4;
if(trace)
itrace("%s%s\t%s,%s,#%.8lux", ci->name, ir&1? "l": "", boname(bo), cname(bo, bi), nia);
if(ir & 1) {
call(nia);
reg.lr = reg.pc + 4;
}
reg.pc = nia-4;
/* branch delays? */
}
void
bcctr(ulong ir)
{
dobranch(ir, ®.ctr, 1);
}
void
bclr(ulong ir)
{
dobranch(ir, ®.lr, 0);
}
void
bcx(ulong ir)
{
int bo, bi, xx;
ulong ea;
long imm;
static char *opc[] = {"bc", "bcl", "bca", "bcla"};
getbobi(ir);
USED(xx);
imm = ir & 0xFFFC;
if(ir & 0x08000)
imm |= 0xFFFF0000;
if((ir & 2) == 0) { /* not absolute address */
ea = reg.pc + imm;
if(trace)
itrace("%s\t%s,%s,.%s%ld\tea = #%.8lux", opc[ir&3], boname(bo), cname(bo, bi), imm<0?"":"+", imm, ea);
} else {
ea = imm;
if(trace)
itrace("%s\t%s,%s,#%.8lux", opc[ir&3], boname(bo), cname(bo, bi), ea);
}
if(condok(ir&0xFFFF0000, 1))
ci->taken++;
else
ea = reg.pc + 4;
if(ir & 1) {
call(ea);
reg.lr = reg.pc+4;
}
reg.pc = ea-4;
/* branch delay? */
}
void
crop(ulong ir)
{
int rd, ra, rb, d;
getarrr(ir);
if(trace)
itrace("%s\tcrb%d,crb%d,crb%d", ci->name, rd, ra, rb);
ra = (reg.cr & bits[ra]) != 0;
rb = (reg.cr & bits[rb]) != 0;
d = 0;
switch(getxo(ir)) {
case 257: d = ra & rb; break;
case 129: d = ra & !rb; break;
case 289: d = ra == rb; break;
case 225: d = !(ra & rb); break;
case 33: d = !(ra | rb); break;
case 449: d = ra | rb; break;
case 417: d = ra | !rb; break;
case 193: d = ra ^ rb; break;
default: undef(ir); break;
}
if(d)
reg.cr |= bits[rd];
}
void
mcrf(ulong ir)
{
int rd, ra, rb;
getarrr(ir);
if(ir & 1 || rd & 3 || ra & 3 || rb)
undef(ir);
ra >>= 2;
rd >>= 2;
reg.cr = (reg.cr & ~mkCR(rd, 0xF)) | mkCR(rd, getCR(ra, reg.cr));
if(trace)
itrace("mcrf\tcrf%d,crf%d", rd, ra);
}
void
call(ulong npc)
{
Symbol s;
if(calltree) {
findsym(npc, CTEXT, &s);
Bprint(bioout, "%8lux %s(", reg.pc, s.name);
printparams(&s, reg.r[1]);
Bprint(bioout, "from ");
printsource(reg.pc);
Bputc(bioout, '\n');
}
}
void
ret(ulong npc)
{
Symbol s;
if(calltree) {
findsym(npc, CTEXT, &s);
Bprint(bioout, "%8lux return to #%lux %s r3=#%lux (%ld)\n",
reg.pc, npc, s.name, reg.r[3], reg.r[3]);
}
}
void
bx(ulong ir)
{
ulong ea;
long imm;
static char *opc[] = {"b", "bl", "ba", "bla"};
imm = ir & 0x03FFFFFC;
if(ir & 0x02000000)
imm |= 0xFC000000;
if((ir & 2) == 0) { /* not absolute address */
ea = reg.pc + imm;
if(trace)
itrace("%s\t.%s%ld\tea = #%.8lux", opc[ir&3], imm<0?"":"+", imm, ea);
} else {
ea = imm;
if(trace)
itrace("%s\t#%.8lux", opc[ir&3], ea);
}
ci->taken++;
if(ir & 1) {
call(ea);
reg.lr = reg.pc+4;
}
reg.pc = ea-4;
/* branch delay? */
}
void
isync(ulong ir)
{
USED(ir);
if(trace)
itrace("isync");
}
|
