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1da177e4 LT |
1 | /* $Id: unaligned.c,v 1.23 2001/12/21 00:54:31 davem Exp $ |
2 | * unaligned.c: Unaligned load/store trap handling with special | |
3 | * cases for the kernel to do them more quickly. | |
4 | * | |
5 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) | |
6 | * Copyright (C) 1996 Jakub Jelinek (jj@sunsite.mff.cuni.cz) | |
7 | */ | |
8 | ||
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/mm.h> | |
13 | #include <linux/module.h> | |
14 | #include <asm/ptrace.h> | |
15 | #include <asm/processor.h> | |
16 | #include <asm/system.h> | |
17 | #include <asm/uaccess.h> | |
18 | #include <linux/smp.h> | |
19 | #include <linux/smp_lock.h> | |
20 | ||
21 | /* #define DEBUG_MNA */ | |
22 | ||
23 | enum direction { | |
24 | load, /* ld, ldd, ldh, ldsh */ | |
25 | store, /* st, std, sth, stsh */ | |
26 | both, /* Swap, ldstub, etc. */ | |
27 | fpload, | |
28 | fpstore, | |
29 | invalid, | |
30 | }; | |
31 | ||
32 | #ifdef DEBUG_MNA | |
33 | static char *dirstrings[] = { | |
34 | "load", "store", "both", "fpload", "fpstore", "invalid" | |
35 | }; | |
36 | #endif | |
37 | ||
38 | static inline enum direction decode_direction(unsigned int insn) | |
39 | { | |
40 | unsigned long tmp = (insn >> 21) & 1; | |
41 | ||
42 | if(!tmp) | |
43 | return load; | |
44 | else { | |
45 | if(((insn>>19)&0x3f) == 15) | |
46 | return both; | |
47 | else | |
48 | return store; | |
49 | } | |
50 | } | |
51 | ||
52 | /* 8 = double-word, 4 = word, 2 = half-word */ | |
53 | static inline int decode_access_size(unsigned int insn) | |
54 | { | |
55 | insn = (insn >> 19) & 3; | |
56 | ||
57 | if(!insn) | |
58 | return 4; | |
59 | else if(insn == 3) | |
60 | return 8; | |
61 | else if(insn == 2) | |
62 | return 2; | |
63 | else { | |
64 | printk("Impossible unaligned trap. insn=%08x\n", insn); | |
65 | die_if_kernel("Byte sized unaligned access?!?!", current->thread.kregs); | |
66 | return 4; /* just to keep gcc happy. */ | |
67 | } | |
68 | } | |
69 | ||
70 | /* 0x400000 = signed, 0 = unsigned */ | |
71 | static inline int decode_signedness(unsigned int insn) | |
72 | { | |
73 | return (insn & 0x400000); | |
74 | } | |
75 | ||
76 | static inline void maybe_flush_windows(unsigned int rs1, unsigned int rs2, | |
77 | unsigned int rd) | |
78 | { | |
79 | if(rs2 >= 16 || rs1 >= 16 || rd >= 16) { | |
80 | /* Wheee... */ | |
81 | __asm__ __volatile__("save %sp, -0x40, %sp\n\t" | |
82 | "save %sp, -0x40, %sp\n\t" | |
83 | "save %sp, -0x40, %sp\n\t" | |
84 | "save %sp, -0x40, %sp\n\t" | |
85 | "save %sp, -0x40, %sp\n\t" | |
86 | "save %sp, -0x40, %sp\n\t" | |
87 | "save %sp, -0x40, %sp\n\t" | |
88 | "restore; restore; restore; restore;\n\t" | |
89 | "restore; restore; restore;\n\t"); | |
90 | } | |
91 | } | |
92 | ||
93 | static inline int sign_extend_imm13(int imm) | |
94 | { | |
95 | return imm << 19 >> 19; | |
96 | } | |
97 | ||
98 | static inline unsigned long fetch_reg(unsigned int reg, struct pt_regs *regs) | |
99 | { | |
100 | struct reg_window *win; | |
101 | ||
102 | if(reg < 16) | |
103 | return (!reg ? 0 : regs->u_regs[reg]); | |
104 | ||
105 | /* Ho hum, the slightly complicated case. */ | |
106 | win = (struct reg_window *) regs->u_regs[UREG_FP]; | |
107 | return win->locals[reg - 16]; /* yes, I know what this does... */ | |
108 | } | |
109 | ||
110 | static inline unsigned long safe_fetch_reg(unsigned int reg, struct pt_regs *regs) | |
111 | { | |
112 | struct reg_window __user *win; | |
113 | unsigned long ret; | |
114 | ||
115 | if (reg < 16) | |
116 | return (!reg ? 0 : regs->u_regs[reg]); | |
117 | ||
118 | /* Ho hum, the slightly complicated case. */ | |
119 | win = (struct reg_window __user *) regs->u_regs[UREG_FP]; | |
120 | ||
121 | if ((unsigned long)win & 3) | |
122 | return -1; | |
123 | ||
124 | if (get_user(ret, &win->locals[reg - 16])) | |
125 | return -1; | |
126 | ||
127 | return ret; | |
128 | } | |
129 | ||
130 | static inline unsigned long *fetch_reg_addr(unsigned int reg, struct pt_regs *regs) | |
131 | { | |
132 | struct reg_window *win; | |
133 | ||
134 | if(reg < 16) | |
135 | return ®s->u_regs[reg]; | |
136 | win = (struct reg_window *) regs->u_regs[UREG_FP]; | |
137 | return &win->locals[reg - 16]; | |
138 | } | |
139 | ||
140 | static unsigned long compute_effective_address(struct pt_regs *regs, | |
141 | unsigned int insn) | |
142 | { | |
143 | unsigned int rs1 = (insn >> 14) & 0x1f; | |
144 | unsigned int rs2 = insn & 0x1f; | |
145 | unsigned int rd = (insn >> 25) & 0x1f; | |
146 | ||
147 | if(insn & 0x2000) { | |
148 | maybe_flush_windows(rs1, 0, rd); | |
149 | return (fetch_reg(rs1, regs) + sign_extend_imm13(insn)); | |
150 | } else { | |
151 | maybe_flush_windows(rs1, rs2, rd); | |
152 | return (fetch_reg(rs1, regs) + fetch_reg(rs2, regs)); | |
153 | } | |
154 | } | |
155 | ||
156 | unsigned long safe_compute_effective_address(struct pt_regs *regs, | |
157 | unsigned int insn) | |
158 | { | |
159 | unsigned int rs1 = (insn >> 14) & 0x1f; | |
160 | unsigned int rs2 = insn & 0x1f; | |
161 | unsigned int rd = (insn >> 25) & 0x1f; | |
162 | ||
163 | if(insn & 0x2000) { | |
164 | maybe_flush_windows(rs1, 0, rd); | |
165 | return (safe_fetch_reg(rs1, regs) + sign_extend_imm13(insn)); | |
166 | } else { | |
167 | maybe_flush_windows(rs1, rs2, rd); | |
168 | return (safe_fetch_reg(rs1, regs) + safe_fetch_reg(rs2, regs)); | |
169 | } | |
170 | } | |
171 | ||
172 | /* This is just to make gcc think panic does return... */ | |
173 | static void unaligned_panic(char *str) | |
174 | { | |
175 | panic(str); | |
176 | } | |
177 | ||
178 | #define do_integer_load(dest_reg, size, saddr, is_signed, errh) ({ \ | |
179 | __asm__ __volatile__ ( \ | |
180 | "cmp %1, 8\n\t" \ | |
181 | "be 9f\n\t" \ | |
182 | " cmp %1, 4\n\t" \ | |
183 | "be 6f\n" \ | |
184 | "4:\t" " ldub [%2], %%l1\n" \ | |
185 | "5:\t" "ldub [%2 + 1], %%l2\n\t" \ | |
186 | "sll %%l1, 8, %%l1\n\t" \ | |
187 | "tst %3\n\t" \ | |
188 | "be 3f\n\t" \ | |
189 | " add %%l1, %%l2, %%l1\n\t" \ | |
190 | "sll %%l1, 16, %%l1\n\t" \ | |
191 | "sra %%l1, 16, %%l1\n" \ | |
192 | "3:\t" "b 0f\n\t" \ | |
193 | " st %%l1, [%0]\n" \ | |
194 | "6:\t" "ldub [%2 + 1], %%l2\n\t" \ | |
195 | "sll %%l1, 24, %%l1\n" \ | |
196 | "7:\t" "ldub [%2 + 2], %%g7\n\t" \ | |
197 | "sll %%l2, 16, %%l2\n" \ | |
198 | "8:\t" "ldub [%2 + 3], %%g1\n\t" \ | |
199 | "sll %%g7, 8, %%g7\n\t" \ | |
200 | "or %%l1, %%l2, %%l1\n\t" \ | |
201 | "or %%g7, %%g1, %%g7\n\t" \ | |
202 | "or %%l1, %%g7, %%l1\n\t" \ | |
203 | "b 0f\n\t" \ | |
204 | " st %%l1, [%0]\n" \ | |
205 | "9:\t" "ldub [%2], %%l1\n" \ | |
206 | "10:\t" "ldub [%2 + 1], %%l2\n\t" \ | |
207 | "sll %%l1, 24, %%l1\n" \ | |
208 | "11:\t" "ldub [%2 + 2], %%g7\n\t" \ | |
209 | "sll %%l2, 16, %%l2\n" \ | |
210 | "12:\t" "ldub [%2 + 3], %%g1\n\t" \ | |
211 | "sll %%g7, 8, %%g7\n\t" \ | |
212 | "or %%l1, %%l2, %%l1\n\t" \ | |
213 | "or %%g7, %%g1, %%g7\n\t" \ | |
214 | "or %%l1, %%g7, %%g7\n" \ | |
215 | "13:\t" "ldub [%2 + 4], %%l1\n\t" \ | |
216 | "st %%g7, [%0]\n" \ | |
217 | "14:\t" "ldub [%2 + 5], %%l2\n\t" \ | |
218 | "sll %%l1, 24, %%l1\n" \ | |
219 | "15:\t" "ldub [%2 + 6], %%g7\n\t" \ | |
220 | "sll %%l2, 16, %%l2\n" \ | |
221 | "16:\t" "ldub [%2 + 7], %%g1\n\t" \ | |
222 | "sll %%g7, 8, %%g7\n\t" \ | |
223 | "or %%l1, %%l2, %%l1\n\t" \ | |
224 | "or %%g7, %%g1, %%g7\n\t" \ | |
225 | "or %%l1, %%g7, %%g7\n\t" \ | |
226 | "st %%g7, [%0 + 4]\n" \ | |
227 | "0:\n\n\t" \ | |
228 | ".section __ex_table,#alloc\n\t" \ | |
229 | ".word 4b, " #errh "\n\t" \ | |
230 | ".word 5b, " #errh "\n\t" \ | |
231 | ".word 6b, " #errh "\n\t" \ | |
232 | ".word 7b, " #errh "\n\t" \ | |
233 | ".word 8b, " #errh "\n\t" \ | |
234 | ".word 9b, " #errh "\n\t" \ | |
235 | ".word 10b, " #errh "\n\t" \ | |
236 | ".word 11b, " #errh "\n\t" \ | |
237 | ".word 12b, " #errh "\n\t" \ | |
238 | ".word 13b, " #errh "\n\t" \ | |
239 | ".word 14b, " #errh "\n\t" \ | |
240 | ".word 15b, " #errh "\n\t" \ | |
241 | ".word 16b, " #errh "\n\n\t" \ | |
242 | ".previous\n\t" \ | |
243 | : : "r" (dest_reg), "r" (size), "r" (saddr), "r" (is_signed) \ | |
244 | : "l1", "l2", "g7", "g1", "cc"); \ | |
245 | }) | |
246 | ||
247 | #define store_common(dst_addr, size, src_val, errh) ({ \ | |
248 | __asm__ __volatile__ ( \ | |
249 | "ld [%2], %%l1\n" \ | |
250 | "cmp %1, 2\n\t" \ | |
251 | "be 2f\n\t" \ | |
252 | " cmp %1, 4\n\t" \ | |
253 | "be 1f\n\t" \ | |
254 | " srl %%l1, 24, %%l2\n\t" \ | |
255 | "srl %%l1, 16, %%g7\n" \ | |
256 | "4:\t" "stb %%l2, [%0]\n\t" \ | |
257 | "srl %%l1, 8, %%l2\n" \ | |
258 | "5:\t" "stb %%g7, [%0 + 1]\n\t" \ | |
259 | "ld [%2 + 4], %%g7\n" \ | |
260 | "6:\t" "stb %%l2, [%0 + 2]\n\t" \ | |
261 | "srl %%g7, 24, %%l2\n" \ | |
262 | "7:\t" "stb %%l1, [%0 + 3]\n\t" \ | |
263 | "srl %%g7, 16, %%l1\n" \ | |
264 | "8:\t" "stb %%l2, [%0 + 4]\n\t" \ | |
265 | "srl %%g7, 8, %%l2\n" \ | |
266 | "9:\t" "stb %%l1, [%0 + 5]\n" \ | |
267 | "10:\t" "stb %%l2, [%0 + 6]\n\t" \ | |
268 | "b 0f\n" \ | |
269 | "11:\t" " stb %%g7, [%0 + 7]\n" \ | |
270 | "1:\t" "srl %%l1, 16, %%g7\n" \ | |
271 | "12:\t" "stb %%l2, [%0]\n\t" \ | |
272 | "srl %%l1, 8, %%l2\n" \ | |
273 | "13:\t" "stb %%g7, [%0 + 1]\n" \ | |
274 | "14:\t" "stb %%l2, [%0 + 2]\n\t" \ | |
275 | "b 0f\n" \ | |
276 | "15:\t" " stb %%l1, [%0 + 3]\n" \ | |
277 | "2:\t" "srl %%l1, 8, %%l2\n" \ | |
278 | "16:\t" "stb %%l2, [%0]\n" \ | |
279 | "17:\t" "stb %%l1, [%0 + 1]\n" \ | |
280 | "0:\n\n\t" \ | |
281 | ".section __ex_table,#alloc\n\t" \ | |
282 | ".word 4b, " #errh "\n\t" \ | |
283 | ".word 5b, " #errh "\n\t" \ | |
284 | ".word 6b, " #errh "\n\t" \ | |
285 | ".word 7b, " #errh "\n\t" \ | |
286 | ".word 8b, " #errh "\n\t" \ | |
287 | ".word 9b, " #errh "\n\t" \ | |
288 | ".word 10b, " #errh "\n\t" \ | |
289 | ".word 11b, " #errh "\n\t" \ | |
290 | ".word 12b, " #errh "\n\t" \ | |
291 | ".word 13b, " #errh "\n\t" \ | |
292 | ".word 14b, " #errh "\n\t" \ | |
293 | ".word 15b, " #errh "\n\t" \ | |
294 | ".word 16b, " #errh "\n\t" \ | |
295 | ".word 17b, " #errh "\n\n\t" \ | |
296 | ".previous\n\t" \ | |
297 | : : "r" (dst_addr), "r" (size), "r" (src_val) \ | |
298 | : "l1", "l2", "g7", "g1", "cc"); \ | |
299 | }) | |
300 | ||
301 | #define do_integer_store(reg_num, size, dst_addr, regs, errh) ({ \ | |
302 | unsigned long *src_val; \ | |
303 | static unsigned long zero[2] = { 0, }; \ | |
304 | \ | |
305 | if (reg_num) src_val = fetch_reg_addr(reg_num, regs); \ | |
306 | else { \ | |
307 | src_val = &zero[0]; \ | |
308 | if (size == 8) \ | |
309 | zero[1] = fetch_reg(1, regs); \ | |
310 | } \ | |
311 | store_common(dst_addr, size, src_val, errh); \ | |
312 | }) | |
313 | ||
314 | extern void smp_capture(void); | |
315 | extern void smp_release(void); | |
316 | ||
317 | #define do_atomic(srcdest_reg, mem, errh) ({ \ | |
318 | unsigned long flags, tmp; \ | |
319 | \ | |
320 | smp_capture(); \ | |
321 | local_irq_save(flags); \ | |
322 | tmp = *srcdest_reg; \ | |
323 | do_integer_load(srcdest_reg, 4, mem, 0, errh); \ | |
324 | store_common(mem, 4, &tmp, errh); \ | |
325 | local_irq_restore(flags); \ | |
326 | smp_release(); \ | |
327 | }) | |
328 | ||
329 | static inline void advance(struct pt_regs *regs) | |
330 | { | |
331 | regs->pc = regs->npc; | |
332 | regs->npc += 4; | |
333 | } | |
334 | ||
335 | static inline int floating_point_load_or_store_p(unsigned int insn) | |
336 | { | |
337 | return (insn >> 24) & 1; | |
338 | } | |
339 | ||
340 | static inline int ok_for_kernel(unsigned int insn) | |
341 | { | |
342 | return !floating_point_load_or_store_p(insn); | |
343 | } | |
344 | ||
345 | void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn) __asm__ ("kernel_mna_trap_fault"); | |
346 | ||
347 | void kernel_mna_trap_fault(struct pt_regs *regs, unsigned int insn) | |
348 | { | |
349 | unsigned long g2 = regs->u_regs [UREG_G2]; | |
350 | unsigned long fixup = search_extables_range(regs->pc, &g2); | |
351 | ||
352 | if (!fixup) { | |
353 | unsigned long address = compute_effective_address(regs, insn); | |
354 | if(address < PAGE_SIZE) { | |
355 | printk(KERN_ALERT "Unable to handle kernel NULL pointer dereference in mna handler"); | |
356 | } else | |
357 | printk(KERN_ALERT "Unable to handle kernel paging request in mna handler"); | |
358 | printk(KERN_ALERT " at virtual address %08lx\n",address); | |
359 | printk(KERN_ALERT "current->{mm,active_mm}->context = %08lx\n", | |
360 | (current->mm ? current->mm->context : | |
361 | current->active_mm->context)); | |
362 | printk(KERN_ALERT "current->{mm,active_mm}->pgd = %08lx\n", | |
363 | (current->mm ? (unsigned long) current->mm->pgd : | |
364 | (unsigned long) current->active_mm->pgd)); | |
365 | die_if_kernel("Oops", regs); | |
366 | /* Not reached */ | |
367 | } | |
368 | regs->pc = fixup; | |
369 | regs->npc = regs->pc + 4; | |
370 | regs->u_regs [UREG_G2] = g2; | |
371 | } | |
372 | ||
373 | asmlinkage void kernel_unaligned_trap(struct pt_regs *regs, unsigned int insn) | |
374 | { | |
375 | enum direction dir = decode_direction(insn); | |
376 | int size = decode_access_size(insn); | |
377 | ||
378 | if(!ok_for_kernel(insn) || dir == both) { | |
379 | printk("Unsupported unaligned load/store trap for kernel at <%08lx>.\n", | |
380 | regs->pc); | |
381 | unaligned_panic("Wheee. Kernel does fpu/atomic unaligned load/store."); | |
382 | ||
383 | __asm__ __volatile__ ("\n" | |
384 | "kernel_unaligned_trap_fault:\n\t" | |
385 | "mov %0, %%o0\n\t" | |
386 | "call kernel_mna_trap_fault\n\t" | |
387 | " mov %1, %%o1\n\t" | |
388 | : | |
389 | : "r" (regs), "r" (insn) | |
390 | : "o0", "o1", "o2", "o3", "o4", "o5", "o7", | |
391 | "g1", "g2", "g3", "g4", "g5", "g7", "cc"); | |
392 | } else { | |
393 | unsigned long addr = compute_effective_address(regs, insn); | |
394 | ||
395 | #ifdef DEBUG_MNA | |
396 | printk("KMNA: pc=%08lx [dir=%s addr=%08lx size=%d] retpc[%08lx]\n", | |
397 | regs->pc, dirstrings[dir], addr, size, regs->u_regs[UREG_RETPC]); | |
398 | #endif | |
399 | switch(dir) { | |
400 | case load: | |
401 | do_integer_load(fetch_reg_addr(((insn>>25)&0x1f), regs), | |
402 | size, (unsigned long *) addr, | |
403 | decode_signedness(insn), | |
404 | kernel_unaligned_trap_fault); | |
405 | break; | |
406 | ||
407 | case store: | |
408 | do_integer_store(((insn>>25)&0x1f), size, | |
409 | (unsigned long *) addr, regs, | |
410 | kernel_unaligned_trap_fault); | |
411 | break; | |
412 | #if 0 /* unsupported */ | |
413 | case both: | |
414 | do_atomic(fetch_reg_addr(((insn>>25)&0x1f), regs), | |
415 | (unsigned long *) addr, | |
416 | kernel_unaligned_trap_fault); | |
417 | break; | |
418 | #endif | |
419 | default: | |
420 | panic("Impossible kernel unaligned trap."); | |
421 | /* Not reached... */ | |
422 | } | |
423 | advance(regs); | |
424 | } | |
425 | } | |
426 | ||
427 | static inline int ok_for_user(struct pt_regs *regs, unsigned int insn, | |
428 | enum direction dir) | |
429 | { | |
430 | unsigned int reg; | |
431 | int check = (dir == load) ? VERIFY_READ : VERIFY_WRITE; | |
432 | int size = ((insn >> 19) & 3) == 3 ? 8 : 4; | |
433 | ||
434 | if ((regs->pc | regs->npc) & 3) | |
435 | return 0; | |
436 | ||
437 | /* Must access_ok() in all the necessary places. */ | |
438 | #define WINREG_ADDR(regnum) \ | |
439 | ((void __user *)(((unsigned long *)regs->u_regs[UREG_FP])+(regnum))) | |
440 | ||
441 | reg = (insn >> 25) & 0x1f; | |
442 | if (reg >= 16) { | |
443 | if (!access_ok(check, WINREG_ADDR(reg - 16), size)) | |
444 | return -EFAULT; | |
445 | } | |
446 | reg = (insn >> 14) & 0x1f; | |
447 | if (reg >= 16) { | |
448 | if (!access_ok(check, WINREG_ADDR(reg - 16), size)) | |
449 | return -EFAULT; | |
450 | } | |
451 | if (!(insn & 0x2000)) { | |
452 | reg = (insn & 0x1f); | |
453 | if (reg >= 16) { | |
454 | if (!access_ok(check, WINREG_ADDR(reg - 16), size)) | |
455 | return -EFAULT; | |
456 | } | |
457 | } | |
458 | #undef WINREG_ADDR | |
459 | return 0; | |
460 | } | |
461 | ||
462 | void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn) __asm__ ("user_mna_trap_fault"); | |
463 | ||
464 | void user_mna_trap_fault(struct pt_regs *regs, unsigned int insn) | |
465 | { | |
466 | siginfo_t info; | |
467 | ||
468 | info.si_signo = SIGBUS; | |
469 | info.si_errno = 0; | |
470 | info.si_code = BUS_ADRALN; | |
471 | info.si_addr = (void __user *)safe_compute_effective_address(regs, insn); | |
472 | info.si_trapno = 0; | |
473 | send_sig_info(SIGBUS, &info, current); | |
474 | } | |
475 | ||
476 | asmlinkage void user_unaligned_trap(struct pt_regs *regs, unsigned int insn) | |
477 | { | |
478 | enum direction dir; | |
479 | ||
480 | lock_kernel(); | |
481 | if(!(current->thread.flags & SPARC_FLAG_UNALIGNED) || | |
482 | (((insn >> 30) & 3) != 3)) | |
483 | goto kill_user; | |
484 | dir = decode_direction(insn); | |
485 | if(!ok_for_user(regs, insn, dir)) { | |
486 | goto kill_user; | |
487 | } else { | |
488 | int size = decode_access_size(insn); | |
489 | unsigned long addr; | |
490 | ||
491 | if(floating_point_load_or_store_p(insn)) { | |
492 | printk("User FPU load/store unaligned unsupported.\n"); | |
493 | goto kill_user; | |
494 | } | |
495 | ||
496 | addr = compute_effective_address(regs, insn); | |
497 | switch(dir) { | |
498 | case load: | |
499 | do_integer_load(fetch_reg_addr(((insn>>25)&0x1f), regs), | |
500 | size, (unsigned long *) addr, | |
501 | decode_signedness(insn), | |
502 | user_unaligned_trap_fault); | |
503 | break; | |
504 | ||
505 | case store: | |
506 | do_integer_store(((insn>>25)&0x1f), size, | |
507 | (unsigned long *) addr, regs, | |
508 | user_unaligned_trap_fault); | |
509 | break; | |
510 | ||
511 | case both: | |
512 | #if 0 /* unsupported */ | |
513 | do_atomic(fetch_reg_addr(((insn>>25)&0x1f), regs), | |
514 | (unsigned long *) addr, | |
515 | user_unaligned_trap_fault); | |
516 | #else | |
517 | /* | |
518 | * This was supported in 2.4. However, we question | |
519 | * the value of SWAP instruction across word boundaries. | |
520 | */ | |
521 | printk("Unaligned SWAP unsupported.\n"); | |
522 | goto kill_user; | |
523 | #endif | |
524 | break; | |
525 | ||
526 | default: | |
527 | unaligned_panic("Impossible user unaligned trap."); | |
528 | ||
529 | __asm__ __volatile__ ("\n" | |
530 | "user_unaligned_trap_fault:\n\t" | |
531 | "mov %0, %%o0\n\t" | |
532 | "call user_mna_trap_fault\n\t" | |
533 | " mov %1, %%o1\n\t" | |
534 | : | |
535 | : "r" (regs), "r" (insn) | |
536 | : "o0", "o1", "o2", "o3", "o4", "o5", "o7", | |
537 | "g1", "g2", "g3", "g4", "g5", "g7", "cc"); | |
538 | goto out; | |
539 | } | |
540 | advance(regs); | |
541 | goto out; | |
542 | } | |
543 | ||
544 | kill_user: | |
545 | user_mna_trap_fault(regs, insn); | |
546 | out: | |
547 | unlock_kernel(); | |
548 | } |