Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * gdb-low.S contains the low-level trap handler for the GDB stub. | |
3 | * | |
4 | * Copyright (C) 1995 Andreas Busse | |
5 | */ | |
6 | #include <linux/config.h> | |
7 | #include <linux/sys.h> | |
8 | ||
9 | #include <asm/asm.h> | |
10 | #include <asm/errno.h> | |
11 | #include <asm/mipsregs.h> | |
12 | #include <asm/regdef.h> | |
13 | #include <asm/stackframe.h> | |
14 | #include <asm/gdb-stub.h> | |
15 | ||
875d43e7 | 16 | #ifdef CONFIG_32BIT |
1da177e4 LT |
17 | #define DMFC0 mfc0 |
18 | #define DMTC0 mtc0 | |
19 | #define LDC1 lwc1 | |
20 | #define SDC1 lwc1 | |
21 | #endif | |
875d43e7 | 22 | #ifdef CONFIG_64BIT |
1da177e4 LT |
23 | #define DMFC0 dmfc0 |
24 | #define DMTC0 dmtc0 | |
25 | #define LDC1 ldc1 | |
26 | #define SDC1 ldc1 | |
27 | #endif | |
28 | ||
29 | /* | |
30 | * [jsun] We reserves about 2x GDB_FR_SIZE in stack. The lower (addressed) | |
31 | * part is used to store registers and passed to exception handler. | |
32 | * The upper part is reserved for "call func" feature where gdb client | |
33 | * saves some of the regs, setups call frame and passes args. | |
34 | * | |
35 | * A trace shows about 200 bytes are used to store about half of all regs. | |
36 | * The rest should be big enough for frame setup and passing args. | |
37 | */ | |
38 | ||
39 | /* | |
40 | * The low level trap handler | |
41 | */ | |
42 | .align 5 | |
43 | NESTED(trap_low, GDB_FR_SIZE, sp) | |
44 | .set noat | |
45 | .set noreorder | |
46 | ||
47 | mfc0 k0, CP0_STATUS | |
48 | sll k0, 3 /* extract cu0 bit */ | |
49 | bltz k0, 1f | |
50 | move k1, sp | |
51 | ||
52 | /* | |
53 | * Called from user mode, go somewhere else. | |
54 | */ | |
55 | lui k1, %hi(saved_vectors) | |
56 | mfc0 k0, CP0_CAUSE | |
57 | andi k0, k0, 0x7c | |
58 | add k1, k1, k0 | |
59 | lw k0, %lo(saved_vectors)(k1) | |
60 | jr k0 | |
61 | nop | |
62 | 1: | |
63 | move k0, sp | |
64 | subu sp, k1, GDB_FR_SIZE*2 # see comment above | |
65 | LONG_S k0, GDB_FR_REG29(sp) | |
66 | LONG_S $2, GDB_FR_REG2(sp) | |
67 | ||
68 | /* | |
69 | * First save the CP0 and special registers | |
70 | */ | |
71 | ||
72 | mfc0 v0, CP0_STATUS | |
73 | LONG_S v0, GDB_FR_STATUS(sp) | |
74 | mfc0 v0, CP0_CAUSE | |
75 | LONG_S v0, GDB_FR_CAUSE(sp) | |
76 | DMFC0 v0, CP0_EPC | |
77 | LONG_S v0, GDB_FR_EPC(sp) | |
78 | DMFC0 v0, CP0_BADVADDR | |
79 | LONG_S v0, GDB_FR_BADVADDR(sp) | |
80 | mfhi v0 | |
81 | LONG_S v0, GDB_FR_HI(sp) | |
82 | mflo v0 | |
83 | LONG_S v0, GDB_FR_LO(sp) | |
84 | ||
85 | /* | |
86 | * Now the integer registers | |
87 | */ | |
88 | ||
89 | LONG_S zero, GDB_FR_REG0(sp) /* I know... */ | |
90 | LONG_S $1, GDB_FR_REG1(sp) | |
91 | /* v0 already saved */ | |
92 | LONG_S $3, GDB_FR_REG3(sp) | |
93 | LONG_S $4, GDB_FR_REG4(sp) | |
94 | LONG_S $5, GDB_FR_REG5(sp) | |
95 | LONG_S $6, GDB_FR_REG6(sp) | |
96 | LONG_S $7, GDB_FR_REG7(sp) | |
97 | LONG_S $8, GDB_FR_REG8(sp) | |
98 | LONG_S $9, GDB_FR_REG9(sp) | |
99 | LONG_S $10, GDB_FR_REG10(sp) | |
100 | LONG_S $11, GDB_FR_REG11(sp) | |
101 | LONG_S $12, GDB_FR_REG12(sp) | |
102 | LONG_S $13, GDB_FR_REG13(sp) | |
103 | LONG_S $14, GDB_FR_REG14(sp) | |
104 | LONG_S $15, GDB_FR_REG15(sp) | |
105 | LONG_S $16, GDB_FR_REG16(sp) | |
106 | LONG_S $17, GDB_FR_REG17(sp) | |
107 | LONG_S $18, GDB_FR_REG18(sp) | |
108 | LONG_S $19, GDB_FR_REG19(sp) | |
109 | LONG_S $20, GDB_FR_REG20(sp) | |
110 | LONG_S $21, GDB_FR_REG21(sp) | |
111 | LONG_S $22, GDB_FR_REG22(sp) | |
112 | LONG_S $23, GDB_FR_REG23(sp) | |
113 | LONG_S $24, GDB_FR_REG24(sp) | |
114 | LONG_S $25, GDB_FR_REG25(sp) | |
115 | LONG_S $26, GDB_FR_REG26(sp) | |
116 | LONG_S $27, GDB_FR_REG27(sp) | |
117 | LONG_S $28, GDB_FR_REG28(sp) | |
118 | /* sp already saved */ | |
119 | LONG_S $30, GDB_FR_REG30(sp) | |
120 | LONG_S $31, GDB_FR_REG31(sp) | |
121 | ||
122 | CLI /* disable interrupts */ | |
123 | ||
124 | /* | |
125 | * Followed by the floating point registers | |
126 | */ | |
127 | mfc0 v0, CP0_STATUS /* FPU enabled? */ | |
128 | srl v0, v0, 16 | |
129 | andi v0, v0, (ST0_CU1 >> 16) | |
130 | ||
131 | beqz v0,2f /* disabled, skip */ | |
132 | nop | |
133 | ||
134 | SDC1 $0, GDB_FR_FPR0(sp) | |
135 | SDC1 $1, GDB_FR_FPR1(sp) | |
136 | SDC1 $2, GDB_FR_FPR2(sp) | |
137 | SDC1 $3, GDB_FR_FPR3(sp) | |
138 | SDC1 $4, GDB_FR_FPR4(sp) | |
139 | SDC1 $5, GDB_FR_FPR5(sp) | |
140 | SDC1 $6, GDB_FR_FPR6(sp) | |
141 | SDC1 $7, GDB_FR_FPR7(sp) | |
142 | SDC1 $8, GDB_FR_FPR8(sp) | |
143 | SDC1 $9, GDB_FR_FPR9(sp) | |
144 | SDC1 $10, GDB_FR_FPR10(sp) | |
145 | SDC1 $11, GDB_FR_FPR11(sp) | |
146 | SDC1 $12, GDB_FR_FPR12(sp) | |
147 | SDC1 $13, GDB_FR_FPR13(sp) | |
148 | SDC1 $14, GDB_FR_FPR14(sp) | |
149 | SDC1 $15, GDB_FR_FPR15(sp) | |
150 | SDC1 $16, GDB_FR_FPR16(sp) | |
151 | SDC1 $17, GDB_FR_FPR17(sp) | |
152 | SDC1 $18, GDB_FR_FPR18(sp) | |
153 | SDC1 $19, GDB_FR_FPR19(sp) | |
154 | SDC1 $20, GDB_FR_FPR20(sp) | |
155 | SDC1 $21, GDB_FR_FPR21(sp) | |
156 | SDC1 $22, GDB_FR_FPR22(sp) | |
157 | SDC1 $23, GDB_FR_FPR23(sp) | |
158 | SDC1 $24, GDB_FR_FPR24(sp) | |
159 | SDC1 $25, GDB_FR_FPR25(sp) | |
160 | SDC1 $26, GDB_FR_FPR26(sp) | |
161 | SDC1 $27, GDB_FR_FPR27(sp) | |
162 | SDC1 $28, GDB_FR_FPR28(sp) | |
163 | SDC1 $29, GDB_FR_FPR29(sp) | |
164 | SDC1 $30, GDB_FR_FPR30(sp) | |
165 | SDC1 $31, GDB_FR_FPR31(sp) | |
166 | ||
167 | /* | |
168 | * FPU control registers | |
169 | */ | |
170 | ||
171 | cfc1 v0, CP1_STATUS | |
172 | LONG_S v0, GDB_FR_FSR(sp) | |
173 | cfc1 v0, CP1_REVISION | |
174 | LONG_S v0, GDB_FR_FIR(sp) | |
175 | ||
176 | /* | |
177 | * Current stack frame ptr | |
178 | */ | |
179 | ||
180 | 2: | |
181 | LONG_S sp, GDB_FR_FRP(sp) | |
182 | ||
183 | /* | |
184 | * CP0 registers (R4000/R4400 unused registers skipped) | |
185 | */ | |
186 | ||
187 | mfc0 v0, CP0_INDEX | |
188 | LONG_S v0, GDB_FR_CP0_INDEX(sp) | |
189 | mfc0 v0, CP0_RANDOM | |
190 | LONG_S v0, GDB_FR_CP0_RANDOM(sp) | |
191 | DMFC0 v0, CP0_ENTRYLO0 | |
192 | LONG_S v0, GDB_FR_CP0_ENTRYLO0(sp) | |
193 | DMFC0 v0, CP0_ENTRYLO1 | |
194 | LONG_S v0, GDB_FR_CP0_ENTRYLO1(sp) | |
195 | DMFC0 v0, CP0_CONTEXT | |
196 | LONG_S v0, GDB_FR_CP0_CONTEXT(sp) | |
197 | mfc0 v0, CP0_PAGEMASK | |
198 | LONG_S v0, GDB_FR_CP0_PAGEMASK(sp) | |
199 | mfc0 v0, CP0_WIRED | |
200 | LONG_S v0, GDB_FR_CP0_WIRED(sp) | |
201 | DMFC0 v0, CP0_ENTRYHI | |
202 | LONG_S v0, GDB_FR_CP0_ENTRYHI(sp) | |
203 | mfc0 v0, CP0_PRID | |
204 | LONG_S v0, GDB_FR_CP0_PRID(sp) | |
205 | ||
206 | .set at | |
207 | ||
208 | /* | |
209 | * Continue with the higher level handler | |
210 | */ | |
211 | ||
212 | move a0,sp | |
213 | ||
214 | jal handle_exception | |
215 | nop | |
216 | ||
217 | /* | |
218 | * Restore all writable registers, in reverse order | |
219 | */ | |
220 | ||
221 | .set noat | |
222 | ||
223 | LONG_L v0, GDB_FR_CP0_ENTRYHI(sp) | |
224 | LONG_L v1, GDB_FR_CP0_WIRED(sp) | |
225 | DMTC0 v0, CP0_ENTRYHI | |
226 | mtc0 v1, CP0_WIRED | |
227 | LONG_L v0, GDB_FR_CP0_PAGEMASK(sp) | |
228 | LONG_L v1, GDB_FR_CP0_ENTRYLO1(sp) | |
229 | mtc0 v0, CP0_PAGEMASK | |
230 | DMTC0 v1, CP0_ENTRYLO1 | |
231 | LONG_L v0, GDB_FR_CP0_ENTRYLO0(sp) | |
232 | LONG_L v1, GDB_FR_CP0_INDEX(sp) | |
233 | DMTC0 v0, CP0_ENTRYLO0 | |
234 | LONG_L v0, GDB_FR_CP0_CONTEXT(sp) | |
235 | mtc0 v1, CP0_INDEX | |
236 | DMTC0 v0, CP0_CONTEXT | |
237 | ||
238 | ||
239 | /* | |
240 | * Next, the floating point registers | |
241 | */ | |
242 | mfc0 v0, CP0_STATUS /* check if the FPU is enabled */ | |
243 | srl v0, v0, 16 | |
244 | andi v0, v0, (ST0_CU1 >> 16) | |
245 | ||
246 | beqz v0, 3f /* disabled, skip */ | |
247 | nop | |
248 | ||
249 | LDC1 $31, GDB_FR_FPR31(sp) | |
250 | LDC1 $30, GDB_FR_FPR30(sp) | |
251 | LDC1 $29, GDB_FR_FPR29(sp) | |
252 | LDC1 $28, GDB_FR_FPR28(sp) | |
253 | LDC1 $27, GDB_FR_FPR27(sp) | |
254 | LDC1 $26, GDB_FR_FPR26(sp) | |
255 | LDC1 $25, GDB_FR_FPR25(sp) | |
256 | LDC1 $24, GDB_FR_FPR24(sp) | |
257 | LDC1 $23, GDB_FR_FPR23(sp) | |
258 | LDC1 $22, GDB_FR_FPR22(sp) | |
259 | LDC1 $21, GDB_FR_FPR21(sp) | |
260 | LDC1 $20, GDB_FR_FPR20(sp) | |
261 | LDC1 $19, GDB_FR_FPR19(sp) | |
262 | LDC1 $18, GDB_FR_FPR18(sp) | |
263 | LDC1 $17, GDB_FR_FPR17(sp) | |
264 | LDC1 $16, GDB_FR_FPR16(sp) | |
265 | LDC1 $15, GDB_FR_FPR15(sp) | |
266 | LDC1 $14, GDB_FR_FPR14(sp) | |
267 | LDC1 $13, GDB_FR_FPR13(sp) | |
268 | LDC1 $12, GDB_FR_FPR12(sp) | |
269 | LDC1 $11, GDB_FR_FPR11(sp) | |
270 | LDC1 $10, GDB_FR_FPR10(sp) | |
271 | LDC1 $9, GDB_FR_FPR9(sp) | |
272 | LDC1 $8, GDB_FR_FPR8(sp) | |
273 | LDC1 $7, GDB_FR_FPR7(sp) | |
274 | LDC1 $6, GDB_FR_FPR6(sp) | |
275 | LDC1 $5, GDB_FR_FPR5(sp) | |
276 | LDC1 $4, GDB_FR_FPR4(sp) | |
277 | LDC1 $3, GDB_FR_FPR3(sp) | |
278 | LDC1 $2, GDB_FR_FPR2(sp) | |
279 | LDC1 $1, GDB_FR_FPR1(sp) | |
280 | LDC1 $0, GDB_FR_FPR0(sp) | |
281 | ||
282 | /* | |
283 | * Now the CP0 and integer registers | |
284 | */ | |
285 | ||
286 | 3: | |
287 | mfc0 t0, CP0_STATUS | |
288 | ori t0, 0x1f | |
289 | xori t0, 0x1f | |
290 | mtc0 t0, CP0_STATUS | |
291 | ||
292 | LONG_L v0, GDB_FR_STATUS(sp) | |
293 | LONG_L v1, GDB_FR_EPC(sp) | |
294 | mtc0 v0, CP0_STATUS | |
295 | DMTC0 v1, CP0_EPC | |
296 | LONG_L v0, GDB_FR_HI(sp) | |
297 | LONG_L v1, GDB_FR_LO(sp) | |
298 | mthi v0 | |
299 | mtlo v1 | |
300 | LONG_L $31, GDB_FR_REG31(sp) | |
301 | LONG_L $30, GDB_FR_REG30(sp) | |
302 | LONG_L $28, GDB_FR_REG28(sp) | |
303 | LONG_L $27, GDB_FR_REG27(sp) | |
304 | LONG_L $26, GDB_FR_REG26(sp) | |
305 | LONG_L $25, GDB_FR_REG25(sp) | |
306 | LONG_L $24, GDB_FR_REG24(sp) | |
307 | LONG_L $23, GDB_FR_REG23(sp) | |
308 | LONG_L $22, GDB_FR_REG22(sp) | |
309 | LONG_L $21, GDB_FR_REG21(sp) | |
310 | LONG_L $20, GDB_FR_REG20(sp) | |
311 | LONG_L $19, GDB_FR_REG19(sp) | |
312 | LONG_L $18, GDB_FR_REG18(sp) | |
313 | LONG_L $17, GDB_FR_REG17(sp) | |
314 | LONG_L $16, GDB_FR_REG16(sp) | |
315 | LONG_L $15, GDB_FR_REG15(sp) | |
316 | LONG_L $14, GDB_FR_REG14(sp) | |
317 | LONG_L $13, GDB_FR_REG13(sp) | |
318 | LONG_L $12, GDB_FR_REG12(sp) | |
319 | LONG_L $11, GDB_FR_REG11(sp) | |
320 | LONG_L $10, GDB_FR_REG10(sp) | |
321 | LONG_L $9, GDB_FR_REG9(sp) | |
322 | LONG_L $8, GDB_FR_REG8(sp) | |
323 | LONG_L $7, GDB_FR_REG7(sp) | |
324 | LONG_L $6, GDB_FR_REG6(sp) | |
325 | LONG_L $5, GDB_FR_REG5(sp) | |
326 | LONG_L $4, GDB_FR_REG4(sp) | |
327 | LONG_L $3, GDB_FR_REG3(sp) | |
328 | LONG_L $2, GDB_FR_REG2(sp) | |
329 | LONG_L $1, GDB_FR_REG1(sp) | |
330 | #if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX) | |
331 | LONG_L k0, GDB_FR_EPC(sp) | |
332 | LONG_L $29, GDB_FR_REG29(sp) /* Deallocate stack */ | |
333 | jr k0 | |
334 | rfe | |
335 | #else | |
336 | LONG_L sp, GDB_FR_REG29(sp) /* Deallocate stack */ | |
337 | ||
338 | .set mips3 | |
339 | eret | |
340 | .set mips0 | |
341 | #endif | |
342 | .set at | |
343 | .set reorder | |
344 | END(trap_low) | |
345 | ||
346 | LEAF(kgdb_read_byte) | |
347 | 4: lb t0, (a0) | |
348 | sb t0, (a1) | |
349 | li v0, 0 | |
350 | jr ra | |
351 | .section __ex_table,"a" | |
352 | PTR 4b, kgdbfault | |
353 | .previous | |
354 | END(kgdb_read_byte) | |
355 | ||
356 | LEAF(kgdb_write_byte) | |
357 | 5: sb a0, (a1) | |
358 | li v0, 0 | |
359 | jr ra | |
360 | .section __ex_table,"a" | |
361 | PTR 5b, kgdbfault | |
362 | .previous | |
363 | END(kgdb_write_byte) | |
364 | ||
365 | .type kgdbfault@function | |
366 | .ent kgdbfault | |
367 | ||
368 | kgdbfault: li v0, -EFAULT | |
369 | jr ra | |
370 | .end kgdbfault |