| 1 | /* $NetBSD: xen_debug.c,v 1.9 2016/07/07 06:55:40 msaitoh Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * |
| 5 | * Copyright (c) 2004 Christian Limpach. |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * Redistribution and use in source and binary forms, with or without |
| 9 | * modification, are permitted provided that the following conditions |
| 10 | * are met: |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * |
| 31 | * Copyright (c) 2002-2003, K A Fraser & R Neugebauer |
| 32 | * |
| 33 | * Permission is hereby granted, free of charge, to any person obtaining a copy |
| 34 | * of this software and associated documentation files (the "Software"), to |
| 35 | * deal in the Software without restriction, including without limitation the |
| 36 | * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| 37 | * sell copies of the Software, and to permit persons to whom the Software is |
| 38 | * furnished to do so, subject to the following conditions: |
| 39 | * |
| 40 | * The above copyright notice and this permission notice shall be included in |
| 41 | * all copies or substantial portions of the Software. |
| 42 | * |
| 43 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 44 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 45 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 46 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 47 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
| 48 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| 49 | * DEALINGS IN THE SOFTWARE. |
| 50 | */ |
| 51 | |
| 52 | |
| 53 | #include <sys/cdefs.h> |
| 54 | __KERNEL_RCSID(0, "$NetBSD: xen_debug.c,v 1.9 2016/07/07 06:55:40 msaitoh Exp $" ); |
| 55 | |
| 56 | #define XENDEBUG |
| 57 | |
| 58 | #include <sys/param.h> |
| 59 | #include <sys/systm.h> |
| 60 | |
| 61 | #include <xen/xen.h> |
| 62 | #include <xen/hypervisor.h> |
| 63 | |
| 64 | #ifdef XENDEBUG |
| 65 | |
| 66 | #define PRINTK_BUFSIZE 1024 |
| 67 | void |
| 68 | printk(const char *fmt, ...) |
| 69 | { |
| 70 | va_list ap; |
| 71 | int ret; |
| 72 | static char buf[PRINTK_BUFSIZE]; |
| 73 | |
| 74 | va_start(ap, fmt); |
| 75 | ret = vsnprintf(buf, PRINTK_BUFSIZE - 1, fmt, ap); |
| 76 | va_end(ap); |
| 77 | buf[ret] = 0; |
| 78 | (void)HYPERVISOR_console_io(CONSOLEIO_write, ret, buf); |
| 79 | } |
| 80 | |
| 81 | void |
| 82 | vprintk(const char *fmt, va_list ap) |
| 83 | { |
| 84 | int ret; |
| 85 | static char buf[PRINTK_BUFSIZE]; |
| 86 | |
| 87 | ret = vsnprintf(buf, PRINTK_BUFSIZE - 1, fmt, ap); |
| 88 | buf[ret] = 0; |
| 89 | (void)HYPERVISOR_console_io(CONSOLEIO_write, ret, buf); |
| 90 | } |
| 91 | |
| 92 | #endif |
| 93 | |
| 94 | #ifdef XENDEBUG_LOW |
| 95 | |
| 96 | int xen_once = 0; |
| 97 | |
| 98 | void hypervisor_callback(void); |
| 99 | void failsafe_callback(void); |
| 100 | |
| 101 | void xen_dbglow_init(void); |
| 102 | void |
| 103 | xen_dbglow_init(void) |
| 104 | { |
| 105 | start_info_t *si; |
| 106 | #if 0 |
| 107 | int i; |
| 108 | #endif |
| 109 | |
| 110 | si = &xen_start_info; |
| 111 | |
| 112 | HYPERVISOR_set_callbacks( |
| 113 | __KERNEL_CS, (unsigned long)hypervisor_callback, |
| 114 | __KERNEL_CS, (unsigned long)failsafe_callback); |
| 115 | |
| 116 | trap_init(); |
| 117 | |
| 118 | /* __sti(); */ |
| 119 | |
| 120 | /* print out some useful information */ |
| 121 | printk(version); |
| 122 | printk("start_info: %p\n" , si); |
| 123 | printk(" nr_pages: %lu" , si->nr_pages); |
| 124 | printk(" shared_inf: %p (was %p)\n" , HYPERVISOR_shared_info, |
| 125 | si->shared_info); |
| 126 | printk(" pt_base: %p" , (void *)si->pt_base); |
| 127 | printk(" mod_start: 0x%lx\n" , si->mod_start); |
| 128 | printk(" mod_len: %lu\n" , si->mod_len); |
| 129 | #if 0 |
| 130 | printk(" net_rings: " ); |
| 131 | for (i = 0; i < MAX_DOMAIN_VIFS; i++) { |
| 132 | if (si->net_rings[i] == 0) |
| 133 | break; |
| 134 | printk(" %lx" , si->net_rings[i]); |
| 135 | }; |
| 136 | printk("\n" ); |
| 137 | printk(" blk_ring: 0x%lx\n" , si->blk_ring); |
| 138 | #endif |
| 139 | printk(" dom_id: %d\n" , si->dom_id); |
| 140 | printk(" flags: 0x%lx\n" , si->flags); |
| 141 | printk(" cmd_line: %s\n" , si->cmd_line ? |
| 142 | (const char *)si->cmd_line : "NULL" ); |
| 143 | } |
| 144 | |
| 145 | |
| 146 | void xen_dbg0(char *); |
| 147 | void |
| 148 | xen_dbg0(char *end) |
| 149 | { |
| 150 | struct cpu_info *ci; |
| 151 | |
| 152 | ci = &cpu_info_primary; |
| 153 | if (xen_once) |
| 154 | printk("xencpu level %d ipending %08x master %08x\n" , |
| 155 | ci->ci_ilevel, ci->ci_ipending, |
| 156 | HYPERVISOR_shared_info->events_mask); |
| 157 | /* ipending %08x imask %08x iunmask %08x */ |
| 158 | /* ci->ci_imask[IPL_NET], ci->ci_iunmask[IPL_NET]); */ |
| 159 | } |
| 160 | |
| 161 | void xen_dbg1(void *esp, int ss); |
| 162 | void |
| 163 | xen_dbg1(void *esp, int ss) |
| 164 | { |
| 165 | #if 1 |
| 166 | struct cpu_info *ci; |
| 167 | |
| 168 | ci = &cpu_info_primary; |
| 169 | if (xen_once) |
| 170 | printk("xenhighlevel %d ipending %08x master %08x events %08x\n" , |
| 171 | ci->ci_ilevel, ci->ci_ipending, |
| 172 | HYPERVISOR_shared_info->events_mask, HYPERVISOR_shared_info->events); |
| 173 | #else |
| 174 | printk("stack switch %p %d/%d, sp %p\n" , esp, ss, IDXSEL(ss), &ss); |
| 175 | #endif |
| 176 | } |
| 177 | |
| 178 | void xen_dbg2(void); |
| 179 | void |
| 180 | xen_dbg2(void) |
| 181 | { |
| 182 | if (xen_once) |
| 183 | printk("xen_dbg2\n" ); |
| 184 | } |
| 185 | |
| 186 | void xen_dbg3(void *, void *); |
| 187 | void |
| 188 | xen_dbg3(void *ss, void *esp) |
| 189 | { |
| 190 | if (xen_once) |
| 191 | printk("xen_dbg3 %p %p\n" , ss, esp); |
| 192 | } |
| 193 | |
| 194 | void xen_dbg4(void *); |
| 195 | void |
| 196 | xen_dbg4(void *esi) |
| 197 | { |
| 198 | |
| 199 | printk("xen_dbg4 %p\n" , esi); |
| 200 | for(;;); |
| 201 | } |
| 202 | |
| 203 | |
| 204 | |
| 205 | |
| 206 | static void do_exit(void); |
| 207 | |
| 208 | /* |
| 209 | * These are assembler stubs in vector.S. |
| 210 | * They are the actual entry points for virtual exceptions. |
| 211 | */ |
| 212 | void divide_error(void); |
| 213 | void debug(void); |
| 214 | void int3(void); |
| 215 | void overflow(void); |
| 216 | void bounds(void); |
| 217 | void invalid_op(void); |
| 218 | void device_not_available(void); |
| 219 | void double_fault(void); |
| 220 | void coprocessor_segment_overrun(void); |
| 221 | void invalid_TSS(void); |
| 222 | void segment_not_present(void); |
| 223 | void stack_segment(void); |
| 224 | void general_protection(void); |
| 225 | void page_fault(void); |
| 226 | void coprocessor_error(void); |
| 227 | void simd_coprocessor_error(void); |
| 228 | void alignment_check(void); |
| 229 | void spurious_interrupt_bug(void); |
| 230 | void machine_check(void); |
| 231 | |
| 232 | static void |
| 233 | dump_regs(struct pt_regs *regs) |
| 234 | { |
| 235 | int in_kernel = 1; |
| 236 | unsigned long esp; |
| 237 | unsigned short ss; |
| 238 | |
| 239 | esp = (unsigned long) (®s->esp); |
| 240 | ss = __KERNEL_DS; |
| 241 | if (regs->xcs & 2) { |
| 242 | in_kernel = 0; |
| 243 | esp = regs->esp; |
| 244 | ss = regs->xss & 0xffff; |
| 245 | } |
| 246 | printf("EIP: %04x:[<%08lx>]\n" , |
| 247 | 0xffff & regs->xcs, regs->eip); |
| 248 | printf("EFLAGS: %08lx\n" ,regs->eflags); |
| 249 | printf("eax: %08lx ebx: %08lx ecx: %08lx edx: %08lx\n" , |
| 250 | regs->eax, regs->ebx, regs->ecx, regs->edx); |
| 251 | printf("esi: %08lx edi: %08lx ebp: %08lx esp: %08lx\n" , |
| 252 | regs->esi, regs->edi, regs->ebp, esp); |
| 253 | printf("ds: %04x es: %04x ss: %04x\n" , |
| 254 | regs->xds & 0xffff, regs->xes & 0xffff, ss); |
| 255 | printf("\n" ); |
| 256 | } |
| 257 | |
| 258 | |
| 259 | static inline void |
| 260 | dump_code(unsigned eip) |
| 261 | { |
| 262 | unsigned *ptr = (unsigned *)eip; |
| 263 | int x; |
| 264 | |
| 265 | printk("Bytes at eip:\n" ); |
| 266 | for (x = -4; x < 5; x++) |
| 267 | printf("%x" , ptr[x]); |
| 268 | } |
| 269 | |
| 270 | |
| 271 | /* |
| 272 | * C handlers here have their parameter-list constructed by the |
| 273 | * assembler stubs above. Each one gets a pointer to a list |
| 274 | * of register values (to be restored at end of exception). |
| 275 | * Some will also receive an error code -- this is the code that |
| 276 | * was generated by the processor for the underlying real exception. |
| 277 | * |
| 278 | * Note that the page-fault exception is special. It also receives |
| 279 | * the faulting linear address. Normally this would be found in |
| 280 | * register CR2, but that is not accessible in a virtualised OS. |
| 281 | */ |
| 282 | |
| 283 | static void inline |
| 284 | do_trap(int trapnr, char *str, struct pt_regs *regs, long error_code) |
| 285 | { |
| 286 | |
| 287 | printk("FATAL: Unhandled Trap (see mini-os:traps.c)" ); |
| 288 | printf("%d %s" , trapnr, str); |
| 289 | dump_regs(regs); |
| 290 | dump_code(regs->eip); |
| 291 | |
| 292 | do_exit(); |
| 293 | } |
| 294 | |
| 295 | #define DO_ERROR(trapnr, str, name) \ |
| 296 | void do_##name(struct pt_regs *regs, long error_code); \ |
| 297 | void do_##name(struct pt_regs *regs, long error_code) \ |
| 298 | { \ |
| 299 | do_trap(trapnr, str, regs, error_code); \ |
| 300 | } |
| 301 | |
| 302 | #define DO_ERROR_INFO(trapnr, str, name, sicode, siaddr) \ |
| 303 | void do_##name(struct pt_regs *regs, long error_code); \ |
| 304 | void do_##name(struct pt_regs *regs, long error_code) \ |
| 305 | { \ |
| 306 | do_trap(trapnr, str, regs, error_code); \ |
| 307 | } |
| 308 | |
| 309 | DO_ERROR_INFO( 0, "divide error" , divide_error, FPE_INTDIV, regs->eip) |
| 310 | DO_ERROR( 3, "int3" , int3) |
| 311 | DO_ERROR( 4, "overflow" , overflow) |
| 312 | DO_ERROR( 5, "bounds" , bounds) |
| 313 | DO_ERROR_INFO( 6, "invalid operand" , invalid_op, ILL_ILLOPN, regs->eip) |
| 314 | DO_ERROR( 7, "device not available" , device_not_available) |
| 315 | DO_ERROR( 8, "double fault" , double_fault) |
| 316 | DO_ERROR( 9, "coprocessor segment overrun" , coprocessor_segment_overrun) |
| 317 | DO_ERROR(10, "invalid TSS" , invalid_TSS) |
| 318 | DO_ERROR(11, "segment not present" , segment_not_present) |
| 319 | DO_ERROR(12, "stack segment" , stack_segment) |
| 320 | DO_ERROR_INFO(17, "alignment check" , alignment_check, BUS_ADRALN, 0) |
| 321 | DO_ERROR(18, "machine check" , machine_check) |
| 322 | |
| 323 | void do_page_fault(struct pt_regs *, long, unsigned long); |
| 324 | void |
| 325 | do_page_fault(struct pt_regs *regs, long error_code, unsigned long address) |
| 326 | { |
| 327 | |
| 328 | printk("Page fault\n" ); |
| 329 | printk("Address: 0x%lx" , address); |
| 330 | printk("Error Code: 0x%lx" , error_code); |
| 331 | printk("eip: \t 0x%lx" , regs->eip); |
| 332 | do_exit(); |
| 333 | } |
| 334 | |
| 335 | void do_general_protection(struct pt_regs *, long); |
| 336 | void |
| 337 | do_general_protection(struct pt_regs *regs, long error_code) |
| 338 | { |
| 339 | |
| 340 | HYPERVISOR_shared_info->events_mask = 0; |
| 341 | printk("GPF\n" ); |
| 342 | printk("Error Code: 0x%lx" , error_code); |
| 343 | dump_regs(regs); |
| 344 | dump_code(regs->eip); |
| 345 | do_exit(); |
| 346 | } |
| 347 | |
| 348 | |
| 349 | void do_debug(struct pt_regs *, long); |
| 350 | void |
| 351 | do_debug(struct pt_regs *regs, long error_code) |
| 352 | { |
| 353 | |
| 354 | printk("Debug exception\n" ); |
| 355 | #define TF_MASK 0x100 |
| 356 | regs->eflags &= ~TF_MASK; |
| 357 | dump_regs(regs); |
| 358 | do_exit(); |
| 359 | } |
| 360 | |
| 361 | |
| 362 | |
| 363 | void do_coprocessor_error(struct pt_regs *, long); |
| 364 | void |
| 365 | do_coprocessor_error(struct pt_regs *regs, long error_code) |
| 366 | { |
| 367 | |
| 368 | printk("Copro error\n" ); |
| 369 | dump_regs(regs); |
| 370 | dump_code(regs->eip); |
| 371 | do_exit(); |
| 372 | } |
| 373 | |
| 374 | void simd_math_error(void *); |
| 375 | void |
| 376 | simd_math_error(void *eip) |
| 377 | { |
| 378 | |
| 379 | printk("SIMD error\n" ); |
| 380 | } |
| 381 | |
| 382 | void do_simd_coprocessor_error(struct pt_regs *, long); |
| 383 | void |
| 384 | do_simd_coprocessor_error(struct pt_regs *regs, long error_code) |
| 385 | { |
| 386 | |
| 387 | printk("SIMD copro error\n" ); |
| 388 | } |
| 389 | |
| 390 | void do_spurious_interrupt_bug(struct pt_regs *, long); |
| 391 | void |
| 392 | do_spurious_interrupt_bug(struct pt_regs *regs, long error_code) |
| 393 | { |
| 394 | } |
| 395 | |
| 396 | static void |
| 397 | do_exit(void) |
| 398 | { |
| 399 | |
| 400 | HYPERVISOR_exit(); |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * Submit a virtual IDT to teh hypervisor. This consists of tuples |
| 405 | * (interrupt vector, privilege ring, CS:EIP of handler). |
| 406 | * The 'privilege ring' field specifies the least-privileged ring that |
| 407 | * can trap to that vector using a software-interrupt instruction (INT). |
| 408 | */ |
| 409 | static trap_info_t trap_table[] = { |
| 410 | { 0, 0, __KERNEL_CS, (unsigned long)divide_error }, |
| 411 | { 1, 0, __KERNEL_CS, (unsigned long)debug }, |
| 412 | { 3, 3, __KERNEL_CS, (unsigned long)int3 }, |
| 413 | { 4, 3, __KERNEL_CS, (unsigned long)overflow }, |
| 414 | { 5, 3, __KERNEL_CS, (unsigned long)bounds }, |
| 415 | { 6, 0, __KERNEL_CS, (unsigned long)invalid_op }, |
| 416 | { 7, 0, __KERNEL_CS, (unsigned long)device_not_available }, |
| 417 | { 8, 0, __KERNEL_CS, (unsigned long)double_fault }, |
| 418 | { 9, 0, __KERNEL_CS, (unsigned long)coprocessor_segment_overrun }, |
| 419 | { 10, 0, __KERNEL_CS, (unsigned long)invalid_TSS }, |
| 420 | { 11, 0, __KERNEL_CS, (unsigned long)segment_not_present }, |
| 421 | { 12, 0, __KERNEL_CS, (unsigned long)stack_segment }, |
| 422 | { 13, 0, __KERNEL_CS, (unsigned long)general_protection }, |
| 423 | { 14, 0, __KERNEL_CS, (unsigned long)page_fault }, |
| 424 | { 15, 0, __KERNEL_CS, (unsigned long)spurious_interrupt_bug }, |
| 425 | { 16, 0, __KERNEL_CS, (unsigned long)coprocessor_error }, |
| 426 | { 17, 0, __KERNEL_CS, (unsigned long)alignment_check }, |
| 427 | { 18, 0, __KERNEL_CS, (unsigned long)machine_check }, |
| 428 | { 19, 0, __KERNEL_CS, (unsigned long)simd_coprocessor_error }, |
| 429 | { 0, 0, 0, 0 } |
| 430 | }; |
| 431 | |
| 432 | void |
| 433 | trap_init(void) |
| 434 | { |
| 435 | |
| 436 | HYPERVISOR_set_trap_table(trap_table); |
| 437 | } |
| 438 | #endif |
| 439 | |