1 #include <u.h>
2 #include <libc.h>
3 #include <bio.h>
4 #include <mach.h>
5 #define Extern extern
6 #include "sparc.h"
7
8 extern ulong textbase;
9
10 ulong
ifetch(ulong addr)11 ifetch(ulong addr)
12 {
13 uchar *va;
14
15 if(addr&3) {
16 Bprint(bioout, "instruction_address_not_aligned [addr %.8lux]\n", addr);
17 longjmp(errjmp, 0);
18 }
19
20 if(icache.on)
21 updateicache(addr);
22
23 va = vaddr(addr);
24 iprof[(addr-textbase)/PROFGRAN]++;
25
26 va += addr&(BY2PG-1);
27
28 return va[0]<<24 | va[1]<<16 | va[2]<<8 | va[3];
29 }
30
31 ulong
getmem_4(ulong addr)32 getmem_4(ulong addr)
33 {
34 ulong val;
35 int i;
36
37 val = 0;
38 for(i = 0; i < 4; i++)
39 val = val<<8 | getmem_b(addr++);
40 return val;
41 }
42
43 ulong
getmem_2(ulong addr)44 getmem_2(ulong addr)
45 {
46 ulong val;
47
48 val = getmem_b(addr);
49 val = val<<8 | getmem_b(addr+1);
50
51 return val;
52 }
53
54 ulong
getmem_w(ulong addr)55 getmem_w(ulong addr)
56 {
57 uchar *va;
58
59 if(addr&3) {
60 Bprint(bioout, "mem_address_not_aligned [load addr %.8lux]\n", addr);
61 longjmp(errjmp, 0);
62 }
63 if(membpt)
64 brkchk(addr, Read);
65
66 va = vaddr(addr);
67 va += addr&(BY2PG-1);
68
69 return va[0]<<24 | va[1]<<16 | va[2]<<8 | va[3];;
70 }
71
72 ushort
getmem_h(ulong addr)73 getmem_h(ulong addr)
74 {
75 uchar *va;
76
77 if(addr&1) {
78 Bprint(bioout, "mem_address_not_aligned [load addr %.8lux]\n", addr);
79 longjmp(errjmp, 0);
80 }
81 if(membpt)
82 brkchk(addr, Read);
83
84 va = vaddr(addr);
85 va += addr&(BY2PG-1);
86
87 return va[0]<<8 | va[1];
88 }
89
90 uchar
getmem_b(ulong addr)91 getmem_b(ulong addr)
92 {
93 uchar *va;
94
95 if(membpt)
96 brkchk(addr, Read);
97
98 va = vaddr(addr);
99 va += addr&(BY2PG-1);
100 return va[0];
101 }
102
103 void
putmem_w(ulong addr,ulong data)104 putmem_w(ulong addr, ulong data)
105 {
106 uchar *va;
107
108 if(addr&3) {
109 Bprint(bioout, "mem_address_not_aligned [store addr %.8lux]\n", addr);
110 longjmp(errjmp, 0);
111 }
112
113 va = vaddr(addr);
114 va += addr&(BY2PG-1);
115
116 va[0] = data>>24;
117 va[1] = data>>16;
118 va[2] = data>>8;
119 va[3] = data;
120 if(membpt)
121 brkchk(addr, Write);
122 }
123 void
putmem_b(ulong addr,uchar data)124 putmem_b(ulong addr, uchar data)
125 {
126 uchar *va;
127
128 va = vaddr(addr);
129 va += addr&(BY2PG-1);
130 va[0] = data;
131 if(membpt)
132 brkchk(addr, Write);
133 }
134
135 void
putmem_h(ulong addr,short data)136 putmem_h(ulong addr, short data)
137 {
138 uchar *va;
139
140 if(addr&1) {
141 Bprint(bioout, "mem_address_not_aligned [store addr %.8lux]\n", addr);
142 longjmp(errjmp, 0);
143 }
144
145 va = vaddr(addr);
146 va += addr&(BY2PG-1);
147 va[0] = data>>8;
148 va[1] = data;
149 if(membpt)
150 brkchk(addr, Write);
151 }
152
153 char *
memio(char * mb,ulong mem,int size,int dir)154 memio(char *mb, ulong mem, int size, int dir)
155 {
156 int i;
157 char *buf, c;
158
159 if(mb == 0)
160 mb = emalloc(size);
161
162 buf = mb;
163 switch(dir) {
164 default:
165 fatal(0, "memio");
166 case MemRead:
167 while(size--)
168 *mb++ = getmem_b(mem++);
169 break;
170 case MemReadstring:
171 for(;;) {
172 if(size-- == 0) {
173 Bprint(bioout, "memio: user/kernel copy too long for mipsim\n");
174 longjmp(errjmp, 0);
175 }
176 c = getmem_b(mem++);
177 *mb++ = c;
178 if(c == '\0')
179 break;
180 }
181 break;
182 case MemWrite:
183 for(i = 0; i < size; i++)
184 putmem_b(mem++, *mb++);
185 break;
186 }
187 return buf;
188 }
189
190 void *
vaddr(ulong addr)191 vaddr(ulong addr)
192 {
193 Segment *s, *es;
194 int off, foff, l, n;
195 uchar **p, *a;
196
197 es = &memory.seg[Nseg];
198 for(s = memory.seg; s < es; s++) {
199 if(addr >= s->base && addr < s->end) {
200 s->refs++;
201 off = (addr-s->base)/BY2PG;
202 p = &s->table[off];
203 if(*p)
204 return *p;
205 s->rss++;
206 switch(s->type) {
207 default:
208 fatal(0, "vaddr");
209 case Text:
210 *p = emalloc(BY2PG);
211 if(seek(text, s->fileoff+(off*BY2PG), 0) < 0)
212 fatal(1, "vaddr text seek");
213 if(read(text, *p, BY2PG) < 0)
214 fatal(1, "vaddr text read");
215 return *p;
216 case Data:
217 *p = emalloc(BY2PG);
218 foff = s->fileoff+(off*BY2PG);
219 if(seek(text, foff, 0) < 0)
220 fatal(1, "vaddr text seek");
221 n = read(text, *p, BY2PG);
222 if(n < 0)
223 fatal(1, "vaddr text read");
224 if(foff + n > s->fileend) {
225 l = BY2PG - (s->fileend-foff);
226 a = *p+(s->fileend-foff);
227 memset(a, 0, l);
228 }
229 return *p;
230 case Bss:
231 case Stack:
232 *p = emalloc(BY2PG);
233 return *p;
234 }
235 }
236 }
237 Bprint(bioout, "data_access_MMU_miss [addr 0x%.8lux]\n", addr);
238 longjmp(errjmp, 0);
239 return 0; /*to stop compiler whining*/
240 }
241