debuggers.hg

annotate xen/arch/x86/x86_32/entry.S @ 3081:ceacd1c23c6c

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bitkeeper revision 1.1159.179.3 (419cc874fJd3ljoD3_vTHS4nWtM2lg)

Move event/failsafe callback addresses into thread_info (arch-dep).
Make the trap_bounce per-domain rather than per-cpu.
author kaf24@scramble.cl.cam.ac.uk
date Thu Nov 18 16:06:12 2004 +0000 (2004-11-18)
parents 3c505be01ff1
children 81e74f5bf690
rev   line source
kaf24@1710 1 /*
kaf24@1710 2 * Hypercall and fault low-level handling routines.
kaf24@1710 3 *
kaf24@1710 4 * Copyright (c) 2002-2004, K A Fraser
kaf24@1710 5 * Copyright (c) 1991, 1992 Linus Torvalds
kaf24@1710 6 */
kaf24@1710 7
kaf24@1710 8 /*
kaf24@1710 9 * The idea for callbacks to guest OSes
kaf24@1710 10 * ====================================
kaf24@1710 11 *
kaf24@1710 12 * First, we require that all callbacks (either via a supplied
kaf24@1710 13 * interrupt-descriptor-table, or via the special event or failsafe callbacks
kaf24@1710 14 * in the shared-info-structure) are to ring 1. This just makes life easier,
kaf24@1710 15 * in that it means we don't have to do messy GDT/LDT lookups to find
kaf24@1710 16 * out which the privilege-level of the return code-selector. That code
kaf24@1710 17 * would just be a hassle to write, and would need to account for running
kaf24@1710 18 * off the end of the GDT/LDT, for example. For all callbacks we check
kaf24@1710 19 * that the provided
kaf24@1710 20 * return CS is not == __HYPERVISOR_{CS,DS}. Apart from that we're safe as
kaf24@1710 21 * don't allow a guest OS to install ring-0 privileges into the GDT/LDT.
kaf24@1710 22 * It's up to the guest OS to ensure all returns via the IDT are to ring 1.
kaf24@1710 23 * If not, we load incorrect SS/ESP values from the TSS (for ring 1 rather
kaf24@1710 24 * than the correct ring) and bad things are bound to ensue -- IRET is
kaf24@1710 25 * likely to fault, and we may end up killing the domain (no harm can
kaf24@1710 26 * come to Xen, though).
kaf24@1710 27 *
kaf24@1710 28 * When doing a callback, we check if the return CS is in ring 0. If so,
kaf24@1710 29 * callback is delayed until next return to ring != 0.
kaf24@1710 30 * If return CS is in ring 1, then we create a callback frame
kaf24@1710 31 * starting at return SS/ESP. The base of the frame does an intra-privilege
kaf24@1710 32 * interrupt-return.
kaf24@1710 33 * If return CS is in ring > 1, we create a callback frame starting
kaf24@1710 34 * at SS/ESP taken from appropriate section of the current TSS. The base
kaf24@1710 35 * of the frame does an inter-privilege interrupt-return.
kaf24@1710 36 *
kaf24@1710 37 * Note that the "failsafe callback" uses a special stackframe:
kaf24@1710 38 * { return_DS, return_ES, return_FS, return_GS, return_EIP,
kaf24@1710 39 * return_CS, return_EFLAGS[, return_ESP, return_SS] }
kaf24@1710 40 * That is, original values for DS/ES/FS/GS are placed on stack rather than
kaf24@1710 41 * in DS/ES/FS/GS themselves. Why? It saves us loading them, only to have them
kaf24@1710 42 * saved/restored in guest OS. Furthermore, if we load them we may cause
kaf24@1710 43 * a fault if they are invalid, which is a hassle to deal with. We avoid
kaf24@1710 44 * that problem if we don't load them :-) This property allows us to use
kaf24@1710 45 * the failsafe callback as a fallback: if we ever fault on loading DS/ES/FS/GS
kaf24@1710 46 * on return to ring != 0, we can simply package it up as a return via
kaf24@1710 47 * the failsafe callback, and let the guest OS sort it out (perhaps by
kaf24@1710 48 * killing an application process). Note that we also do this for any
kaf24@1710 49 * faulting IRET -- just let the guest OS handle it via the event
kaf24@1710 50 * callback.
kaf24@1710 51 *
kaf24@1710 52 * We terminate a domain in the following cases:
kaf24@1710 53 * - creating a callback stack frame (due to bad ring-1 stack).
kaf24@1710 54 * - faulting IRET on entry to failsafe callback handler.
kaf24@1710 55 * So, each domain must keep its ring-1 %ss/%esp and failsafe callback
kaf24@1710 56 * handler in good order (absolutely no faults allowed!).
kaf24@1710 57 */
kaf24@1710 58
kaf24@1710 59 #include <xen/config.h>
kaf24@1710 60 #include <xen/errno.h>
kaf24@2085 61 #include <xen/softirq.h>
kaf24@2954 62 #include <asm/x86_32/asm_defns.h>
kaf24@2827 63 #include <public/xen.h>
kaf24@1710 64
kaf24@1710 65 #define GET_CURRENT(reg) \
kaf24@3010 66 movl $8192-4, reg; \
kaf24@1710 67 orl %esp, reg; \
kaf24@1710 68 andl $~3,reg; \
kaf24@1710 69 movl (reg),reg;
kaf24@1710 70
kaf24@1710 71 ENTRY(continue_nonidle_task)
kaf24@1710 72 GET_CURRENT(%ebx)
kaf24@1710 73 jmp test_all_events
kaf24@1710 74
kaf24@1710 75 ALIGN
kaf24@1710 76 /*
kaf24@1710 77 * HYPERVISOR_multicall(call_list, nr_calls)
kaf24@1710 78 * Execute a list of 'nr_calls' hypercalls, pointed at by 'call_list'.
kaf24@1710 79 * This is fairly easy except that:
kaf24@1710 80 * 1. We may fault reading the call list, and must patch that up; and
kaf24@1710 81 * 2. We cannot recursively call HYPERVISOR_multicall, or a malicious
kaf24@1710 82 * caller could cause our stack to blow up.
kaf24@1710 83 */
kaf24@2446 84 #define MULTICALL_ENTRY_ORDER 5
kaf24@1710 85 do_multicall:
kaf24@1710 86 popl %eax
kaf24@1710 87 cmpl $SYMBOL_NAME(multicall_return_from_call),%eax
kaf24@1710 88 je multicall_return_from_call
kaf24@1710 89 pushl %ebx
kaf24@1710 90 movl 4(%esp),%ebx /* EBX == call_list */
kaf24@1710 91 movl 8(%esp),%ecx /* ECX == nr_calls */
kaf24@2446 92 /* Ensure the entire multicall list is below HYPERVISOR_VIRT_START. */
kaf24@2446 93 movl %ecx,%eax
kaf24@2446 94 shll $MULTICALL_ENTRY_ORDER,%eax
kaf24@2446 95 addl %ebx,%eax /* EAX == end of multicall list */
kaf24@2446 96 jc bad_multicall_address
kaf24@2446 97 cmpl $__HYPERVISOR_VIRT_START,%eax
kaf24@2446 98 jnc bad_multicall_address
kaf24@1710 99 multicall_loop:
kaf24@1710 100 pushl %ecx
kaf24@1710 101 multicall_fault1:
kaf24@1710 102 pushl 20(%ebx) # args[4]
kaf24@1710 103 multicall_fault2:
kaf24@1710 104 pushl 16(%ebx) # args[3]
kaf24@1710 105 multicall_fault3:
kaf24@1710 106 pushl 12(%ebx) # args[2]
kaf24@1710 107 multicall_fault4:
kaf24@1710 108 pushl 8(%ebx) # args[1]
kaf24@1710 109 multicall_fault5:
kaf24@1710 110 pushl 4(%ebx) # args[0]
kaf24@1710 111 multicall_fault6:
kaf24@1710 112 movl (%ebx),%eax # op
kaf24@1710 113 andl $(NR_hypercalls-1),%eax
kaf24@1710 114 call *SYMBOL_NAME(hypercall_table)(,%eax,4)
kaf24@1710 115 multicall_return_from_call:
kaf24@1710 116 multicall_fault7:
kaf24@1710 117 movl %eax,24(%ebx) # args[5] == result
kaf24@1710 118 addl $20,%esp
kaf24@1710 119 popl %ecx
kaf24@2446 120 addl $(1<<MULTICALL_ENTRY_ORDER),%ebx
kaf24@1710 121 loop multicall_loop
kaf24@1710 122 popl %ebx
kaf24@1710 123 xorl %eax,%eax
kaf24@1710 124 jmp ret_from_hypercall
kaf24@1710 125
kaf24@2446 126 bad_multicall_address:
kaf24@2446 127 popl %ebx
kaf24@2446 128 movl $-EFAULT,%eax
kaf24@2446 129 jmp ret_from_hypercall
kaf24@2446 130
kaf24@1710 131 .section __ex_table,"a"
kaf24@1710 132 .align 4
kaf24@1710 133 .long multicall_fault1, multicall_fixup1
kaf24@1710 134 .long multicall_fault2, multicall_fixup2
kaf24@1710 135 .long multicall_fault3, multicall_fixup3
kaf24@1710 136 .long multicall_fault4, multicall_fixup4
kaf24@1710 137 .long multicall_fault5, multicall_fixup5
kaf24@1710 138 .long multicall_fault6, multicall_fixup6
cl349@2570 139 .long multicall_fault7, multicall_fixup6
kaf24@1710 140 .previous
kaf24@1710 141
kaf24@1710 142 .section .fixup,"ax"
kaf24@1710 143 multicall_fixup6:
kaf24@1710 144 addl $4,%esp
kaf24@1710 145 multicall_fixup5:
kaf24@1710 146 addl $4,%esp
kaf24@1710 147 multicall_fixup4:
kaf24@1710 148 addl $4,%esp
kaf24@1710 149 multicall_fixup3:
kaf24@1710 150 addl $4,%esp
kaf24@1710 151 multicall_fixup2:
kaf24@1710 152 addl $4,%esp
kaf24@1710 153 multicall_fixup1:
kaf24@1710 154 addl $4,%esp
kaf24@1710 155 popl %ebx
kaf24@1710 156 movl $-EFAULT,%eax
kaf24@1710 157 jmp ret_from_hypercall
kaf24@1710 158 .previous
kaf24@1710 159
kaf24@1710 160 ALIGN
kaf24@1710 161 restore_all_guest:
kaf24@2954 162 1: movl XREGS_ds(%esp),%ds
kaf24@2954 163 2: movl XREGS_es(%esp),%es
kaf24@2954 164 3: movl XREGS_fs(%esp),%fs
kaf24@2954 165 4: movl XREGS_gs(%esp),%gs
kaf24@1710 166 popl %ebx
kaf24@1710 167 popl %ecx
kaf24@1710 168 popl %edx
kaf24@1710 169 popl %esi
kaf24@1710 170 popl %edi
kaf24@1710 171 popl %ebp
kaf24@1710 172 popl %eax
kaf24@1710 173 addl $4,%esp
kaf24@1710 174 5: iret
kaf24@1710 175 .section .fixup,"ax"
kaf24@2954 176 6: subl $4,%esp
kaf24@2954 177 pushl %eax
kaf24@1710 178 pushl %ebp
kaf24@1710 179 pushl %edi
kaf24@1710 180 pushl %esi
kaf24@1710 181 pushl %edx
kaf24@1710 182 pushl %ecx
kaf24@1710 183 pushl %ebx
kaf24@2955 184 7: SET_XEN_SEGMENTS(a)
kaf24@2954 185 jmp failsafe_callback
kaf24@1710 186 .previous
kaf24@1710 187 .section __ex_table,"a"
kaf24@1710 188 .align 4
kaf24@2954 189 .long 1b,7b
kaf24@1710 190 .long 2b,7b
kaf24@2954 191 .long 3b,7b
kaf24@2954 192 .long 4b,7b
kaf24@2954 193 .long 5b,6b
kaf24@1710 194 .previous
kaf24@1710 195
kaf24@1710 196 /* No special register assumptions */
kaf24@1710 197 failsafe_callback:
kaf24@1710 198 GET_CURRENT(%ebx)
kaf24@3081 199 leal DOMAIN_trap_bounce(%ebx),%edx
kaf24@2954 200 movl DOMAIN_failsafe_addr(%ebx),%eax
kaf24@3081 201 movl %eax,TRAPBOUNCE_eip(%edx)
kaf24@2954 202 movl DOMAIN_failsafe_sel(%ebx),%eax
kaf24@3081 203 movw %ax,TRAPBOUNCE_cs(%edx)
kaf24@1710 204 call create_bounce_frame
kaf24@1710 205 subl $16,%esi # add DS/ES/FS/GS to failsafe stack frame
kaf24@2954 206 movl XREGS_ds(%esp),%eax
kaf24@2954 207 FAULT1: movl %eax,%gs:(%esi)
kaf24@2954 208 movl XREGS_es(%esp),%eax
kaf24@2954 209 FAULT2: movl %eax,%gs:4(%esi)
kaf24@2954 210 movl XREGS_fs(%esp),%eax
kaf24@2954 211 FAULT3: movl %eax,%gs:8(%esi)
kaf24@2954 212 movl XREGS_gs(%esp),%eax
kaf24@2954 213 FAULT4: movl %eax,%gs:12(%esi)
kaf24@2954 214 movl %esi,XREGS_esp(%esp)
kaf24@1710 215 popl %ebx
kaf24@1710 216 popl %ecx
kaf24@1710 217 popl %edx
kaf24@1710 218 popl %esi
kaf24@1710 219 popl %edi
kaf24@1710 220 popl %ebp
kaf24@1710 221 popl %eax
kaf24@2954 222 addl $4,%esp
kaf24@1710 223 FAULT5: iret
kaf24@1710 224
kaf24@1710 225 ALIGN
kaf24@1710 226 restore_all_xen:
kaf24@1710 227 popl %ebx
kaf24@1710 228 popl %ecx
kaf24@1710 229 popl %edx
kaf24@1710 230 popl %esi
kaf24@1710 231 popl %edi
kaf24@1710 232 popl %ebp
kaf24@1710 233 popl %eax
kaf24@1710 234 addl $4,%esp
kaf24@1710 235 iret
kaf24@1710 236
kaf24@1710 237 ALIGN
kaf24@1710 238 ENTRY(hypercall)
kaf24@1710 239 pushl %eax # save orig_eax
kaf24@2955 240 SAVE_ALL(b)
kaf24@2954 241 sti
kaf24@2954 242 GET_CURRENT(%ebx)
kaf24@1710 243 andl $(NR_hypercalls-1),%eax
kaf24@1710 244 call *SYMBOL_NAME(hypercall_table)(,%eax,4)
kaf24@1710 245
kaf24@1710 246 ret_from_hypercall:
kaf24@2954 247 movl %eax,XREGS_eax(%esp) # save the return value
kaf24@1710 248
kaf24@1710 249 test_all_events:
kaf24@1710 250 xorl %ecx,%ecx
kaf24@1710 251 notl %ecx
kaf24@1710 252 cli # tests must not race interrupts
kaf24@1710 253 /*test_softirqs:*/
kaf24@2954 254 movl DOMAIN_processor(%ebx),%eax
kaf24@1710 255 shl $6,%eax # sizeof(irq_cpustat) == 64
kaf24@1710 256 test %ecx,SYMBOL_NAME(irq_stat)(%eax,1)
kaf24@1710 257 jnz process_softirqs
kaf24@1710 258 /*test_guest_events:*/
kaf24@2954 259 movl DOMAIN_shared_info(%ebx),%eax
kaf24@2954 260 testb $0xFF,SHINFO_upcall_mask(%eax)
kaf24@1710 261 jnz restore_all_guest
kaf24@2954 262 testb $0xFF,SHINFO_upcall_pending(%eax)
kaf24@1710 263 jz restore_all_guest
kaf24@2954 264 movb $1,SHINFO_upcall_mask(%eax) # Upcalls are masked during delivery
kaf24@1710 265 /*process_guest_events:*/
kaf24@3081 266 leal DOMAIN_trap_bounce(%ebx),%edx
kaf24@2954 267 movl DOMAIN_event_addr(%ebx),%eax
kaf24@3081 268 movl %eax,TRAPBOUNCE_eip(%edx)
kaf24@2954 269 movl DOMAIN_event_sel(%ebx),%eax
kaf24@3081 270 movw %ax,TRAPBOUNCE_cs(%edx)
kaf24@1710 271 call create_bounce_frame
kaf24@1710 272 jmp restore_all_guest
kaf24@1710 273
kaf24@1710 274 ALIGN
kaf24@1710 275 process_softirqs:
kaf24@1710 276 sti
kaf24@1710 277 call SYMBOL_NAME(do_softirq)
kaf24@1710 278 jmp test_all_events
kaf24@1710 279
kaf24@2954 280 /* CREATE A BASIC EXCEPTION FRAME ON GUEST OS (RING-1) STACK: */
kaf24@2954 281 /* {EIP, CS, EFLAGS, [ESP, SS]} */
kaf24@3081 282 /* %edx == trap_bounce, %ebx == task_struct */
kaf24@2954 283 /* %eax,%ecx are clobbered. %gs:%esi contain new XREGS_ss/XREGS_esp. */
kaf24@1710 284 create_bounce_frame:
kaf24@2954 285 mov XREGS_cs+4(%esp),%cl
kaf24@1710 286 test $2,%cl
kaf24@1710 287 jz 1f /* jump if returning to an existing ring-1 activation */
kaf24@1710 288 /* obtain ss/esp from TSS -- no current ring-1 activations */
kaf24@2954 289 movl DOMAIN_processor(%ebx),%eax
kaf24@1710 290 /* next 4 lines multiply %eax by 8320, which is sizeof(tss_struct) */
kaf24@1710 291 movl %eax, %ecx
kaf24@1710 292 shll $7, %ecx
kaf24@1710 293 shll $13, %eax
kaf24@1710 294 addl %ecx,%eax
kaf24@1710 295 addl $init_tss + 12,%eax
kaf24@1710 296 movl (%eax),%esi /* tss->esp1 */
kaf24@2954 297 FAULT6: movl 4(%eax),%gs /* tss->ss1 */
kaf24@1710 298 /* base of stack frame must contain ss/esp (inter-priv iret) */
kaf24@1710 299 subl $8,%esi
kaf24@2954 300 movl XREGS_esp+4(%esp),%eax
kaf24@2954 301 FAULT7: movl %eax,%gs:(%esi)
kaf24@2954 302 movl XREGS_ss+4(%esp),%eax
kaf24@2954 303 FAULT8: movl %eax,%gs:4(%esi)
kaf24@1710 304 jmp 2f
kaf24@1710 305 1: /* obtain ss/esp from oldss/oldesp -- a ring-1 activation exists */
kaf24@2954 306 movl XREGS_esp+4(%esp),%esi
kaf24@2954 307 FAULT9: movl XREGS_ss+4(%esp),%gs
kaf24@1710 308 2: /* Construct a stack frame: EFLAGS, CS/EIP */
kaf24@1710 309 subl $12,%esi
kaf24@2954 310 movl XREGS_eip+4(%esp),%eax
kaf24@2954 311 FAULT10:movl %eax,%gs:(%esi)
kaf24@2954 312 movl XREGS_cs+4(%esp),%eax
kaf24@2954 313 FAULT11:movl %eax,%gs:4(%esi)
kaf24@2954 314 movl XREGS_eflags+4(%esp),%eax
kaf24@2954 315 FAULT12:movl %eax,%gs:8(%esi)
kaf24@1710 316 /* Rewrite our stack frame and return to ring 1. */
kaf24@1710 317 /* IA32 Ref. Vol. 3: TF, VM, RF and NT flags are cleared on trap. */
kaf24@1710 318 andl $0xfffcbeff,%eax
kaf24@2954 319 movl %eax,XREGS_eflags+4(%esp)
kaf24@2954 320 movl %gs,XREGS_ss+4(%esp)
kaf24@2954 321 movl %esi,XREGS_esp+4(%esp)
kaf24@3081 322 movzwl TRAPBOUNCE_cs(%edx),%eax
kaf24@2954 323 movl %eax,XREGS_cs+4(%esp)
kaf24@3081 324 movl TRAPBOUNCE_eip(%edx),%eax
kaf24@2954 325 movl %eax,XREGS_eip+4(%esp)
kaf24@1710 326 ret
kaf24@2954 327
kaf24@1710 328 .section __ex_table,"a"
kaf24@1710 329 .align 4
kaf24@1710 330 .long FAULT1, crash_domain_fixup3 # Fault writing to ring-1 stack
kaf24@1710 331 .long FAULT2, crash_domain_fixup3 # Fault writing to ring-1 stack
kaf24@1710 332 .long FAULT3, crash_domain_fixup3 # Fault writing to ring-1 stack
kaf24@1710 333 .long FAULT4, crash_domain_fixup3 # Fault writing to ring-1 stack
kaf24@1710 334 .long FAULT5, crash_domain_fixup1 # Fault executing failsafe iret
kaf24@1710 335 .long FAULT6, crash_domain_fixup2 # Fault loading ring-1 stack selector
kaf24@1710 336 .long FAULT7, crash_domain_fixup2 # Fault writing to ring-1 stack
kaf24@1710 337 .long FAULT8, crash_domain_fixup2 # Fault writing to ring-1 stack
kaf24@1710 338 .long FAULT9, crash_domain_fixup2 # Fault loading ring-1 stack selector
kaf24@1710 339 .long FAULT10,crash_domain_fixup2 # Fault writing to ring-1 stack
kaf24@1710 340 .long FAULT11,crash_domain_fixup2 # Fault writing to ring-1 stack
kaf24@1710 341 .long FAULT12,crash_domain_fixup2 # Fault writing to ring-1 stack
kaf24@1710 342 .long FAULT13,crash_domain_fixup3 # Fault writing to ring-1 stack
kaf24@1710 343 .long FAULT14,crash_domain_fixup3 # Fault writing to ring-1 stack
kaf24@1710 344 .previous
kaf24@1710 345
kaf24@1710 346 # This handler kills domains which experience unrecoverable faults.
kaf24@1710 347 .section .fixup,"ax"
kaf24@1710 348 crash_domain_fixup1:
kaf24@1710 349 subl $4,%esp
kaf24@2955 350 SAVE_ALL(a)
kaf24@2954 351 sti
kaf24@1710 352 jmp domain_crash
kaf24@1710 353 crash_domain_fixup2:
kaf24@1710 354 addl $4,%esp
kaf24@1710 355 crash_domain_fixup3:
kaf24@1710 356 jmp domain_crash
kaf24@1710 357 .previous
kaf24@1710 358
kaf24@1710 359 ALIGN
kaf24@1710 360 process_guest_exception_and_events:
kaf24@3081 361 leal DOMAIN_trap_bounce(%ebx),%edx
kaf24@3081 362 testb $~0,TRAPBOUNCE_flags(%edx)
kaf24@1710 363 jz test_all_events
kaf24@1710 364 call create_bounce_frame # just the basic frame
kaf24@3081 365 mov TRAPBOUNCE_flags(%edx),%cl
kaf24@3081 366 test $TBF_TRAP_NOCODE,%cl
kaf24@1710 367 jnz 2f
kaf24@1710 368 subl $4,%esi # push error_code onto guest frame
kaf24@3081 369 movl TRAPBOUNCE_error_code(%edx),%eax
kaf24@2954 370 FAULT13:movl %eax,%gs:(%esi)
kaf24@3081 371 test $TBF_TRAP_CR2,%cl
kaf24@1710 372 jz 1f
kaf24@1710 373 subl $4,%esi # push %cr2 onto guest frame
kaf24@3081 374 movl TRAPBOUNCE_cr2(%edx),%eax
kaf24@2954 375 FAULT14:movl %eax,%gs:(%esi)
kaf24@2954 376 1: movl %esi,XREGS_esp(%esp)
kaf24@3081 377 2: movb $0,TRAPBOUNCE_flags(%edx)
kaf24@1710 378 jmp test_all_events
kaf24@1710 379
kaf24@1710 380 ALIGN
kaf24@1710 381 ENTRY(ret_from_intr)
kaf24@1710 382 GET_CURRENT(%ebx)
kaf24@2954 383 movb XREGS_cs(%esp),%al
kaf24@1710 384 testb $3,%al # return to non-supervisor?
kaf24@1710 385 jne test_all_events
kaf24@1710 386 jmp restore_all_xen
kaf24@1710 387
kaf24@1710 388 ENTRY(divide_error)
kaf24@1710 389 pushl $0 # no error code
kaf24@1710 390 pushl $ SYMBOL_NAME(do_divide_error)
kaf24@1710 391 ALIGN
kaf24@1710 392 error_code:
kaf24@2954 393 cld
kaf24@2954 394 pushl %ebp
kaf24@1710 395 pushl %edi
kaf24@1710 396 pushl %esi
kaf24@1710 397 pushl %edx
kaf24@1710 398 pushl %ecx
kaf24@1710 399 pushl %ebx
kaf24@2954 400 movb XREGS_cs(%esp),%bl
kaf24@2954 401 testb $3,%bl
kaf24@2954 402 je 1f
kaf24@2954 403 movl %ds,XREGS_ds(%esp)
kaf24@2954 404 movl %es,XREGS_es(%esp)
kaf24@2954 405 movl %fs,XREGS_fs(%esp)
kaf24@2954 406 movl %gs,XREGS_gs(%esp)
kaf24@2955 407 1: SET_XEN_SEGMENTS(b)
kaf24@2954 408 movl XREGS_orig_eax(%esp),%esi # get the error code
kaf24@2954 409 movl XREGS_eax(%esp),%edi # get the function address
kaf24@2954 410 movl %eax,XREGS_eax(%esp)
kaf24@1710 411 movl %esp,%edx
kaf24@1710 412 pushl %esi # push the error code
ach61@2843 413 pushl %edx # push the xen_regs pointer
kaf24@1710 414 GET_CURRENT(%ebx)
kaf24@2954 415 call *%edi
kaf24@1710 416 addl $8,%esp
kaf24@2954 417 movb XREGS_cs(%esp),%al
kaf24@1710 418 testb $3,%al
kaf24@1710 419 je restore_all_xen
kaf24@1710 420 jmp process_guest_exception_and_events
kaf24@1710 421
kaf24@1710 422 ENTRY(coprocessor_error)
kaf24@1710 423 pushl $0
kaf24@1710 424 pushl $ SYMBOL_NAME(do_coprocessor_error)
kaf24@1710 425 jmp error_code
kaf24@1710 426
kaf24@1710 427 ENTRY(simd_coprocessor_error)
kaf24@1710 428 pushl $0
kaf24@1710 429 pushl $ SYMBOL_NAME(do_simd_coprocessor_error)
kaf24@1710 430 jmp error_code
kaf24@1710 431
kaf24@1710 432 ENTRY(device_not_available)
kaf24@1710 433 pushl $0
kaf24@1710 434 pushl $SYMBOL_NAME(math_state_restore)
kaf24@1710 435 jmp error_code
kaf24@1710 436
kaf24@1710 437 ENTRY(debug)
kaf24@1710 438 pushl $0
kaf24@1710 439 pushl $ SYMBOL_NAME(do_debug)
kaf24@1710 440 jmp error_code
kaf24@1710 441
kaf24@1710 442 ENTRY(int3)
kaf24@1710 443 pushl $0
kaf24@1710 444 pushl $ SYMBOL_NAME(do_int3)
kaf24@1710 445 jmp error_code
kaf24@1710 446
kaf24@1710 447 ENTRY(overflow)
kaf24@1710 448 pushl $0
kaf24@1710 449 pushl $ SYMBOL_NAME(do_overflow)
kaf24@1710 450 jmp error_code
kaf24@1710 451
kaf24@1710 452 ENTRY(bounds)
kaf24@1710 453 pushl $0
kaf24@1710 454 pushl $ SYMBOL_NAME(do_bounds)
kaf24@1710 455 jmp error_code
kaf24@1710 456
kaf24@1710 457 ENTRY(invalid_op)
kaf24@1710 458 pushl $0
kaf24@1710 459 pushl $ SYMBOL_NAME(do_invalid_op)
kaf24@1710 460 jmp error_code
kaf24@1710 461
kaf24@1710 462 ENTRY(coprocessor_segment_overrun)
kaf24@1710 463 pushl $0
kaf24@1710 464 pushl $ SYMBOL_NAME(do_coprocessor_segment_overrun)
kaf24@1710 465 jmp error_code
kaf24@1710 466
kaf24@1710 467 ENTRY(invalid_TSS)
kaf24@1710 468 pushl $ SYMBOL_NAME(do_invalid_TSS)
kaf24@1710 469 jmp error_code
kaf24@1710 470
kaf24@1710 471 ENTRY(segment_not_present)
kaf24@1710 472 pushl $ SYMBOL_NAME(do_segment_not_present)
kaf24@1710 473 jmp error_code
kaf24@1710 474
kaf24@1710 475 ENTRY(stack_segment)
kaf24@1710 476 pushl $ SYMBOL_NAME(do_stack_segment)
kaf24@1710 477 jmp error_code
kaf24@1710 478
kaf24@1710 479 ENTRY(general_protection)
kaf24@1710 480 pushl $ SYMBOL_NAME(do_general_protection)
kaf24@1710 481 jmp error_code
kaf24@1710 482
kaf24@1710 483 ENTRY(alignment_check)
kaf24@1710 484 pushl $ SYMBOL_NAME(do_alignment_check)
kaf24@1710 485 jmp error_code
kaf24@1710 486
kaf24@1710 487 ENTRY(page_fault)
kaf24@1710 488 pushl $ SYMBOL_NAME(do_page_fault)
kaf24@1710 489 jmp error_code
kaf24@1710 490
kaf24@1710 491 ENTRY(machine_check)
kaf24@1710 492 pushl $0
kaf24@1710 493 pushl $ SYMBOL_NAME(do_machine_check)
kaf24@1710 494 jmp error_code
kaf24@1710 495
kaf24@1710 496 ENTRY(spurious_interrupt_bug)
kaf24@1710 497 pushl $0
kaf24@1710 498 pushl $ SYMBOL_NAME(do_spurious_interrupt_bug)
kaf24@1710 499 jmp error_code
kaf24@1710 500
kaf24@1710 501 ENTRY(nmi)
kaf24@1710 502 # Save state but do not trash the segment registers!
kaf24@1710 503 # We may otherwise be unable to reload them or copy them to ring 1.
kaf24@1710 504 pushl %eax
kaf24@2955 505 SAVE_ALL_NOSEGREGS(a)
kaf24@1710 506
kaf24@2085 507 # Check for hardware problems.
kaf24@1710 508 inb $0x61,%al
kaf24@1710 509 testb $0x80,%al
kaf24@2080 510 jne nmi_parity_err
kaf24@1710 511 testb $0x40,%al
kaf24@1710 512 jne nmi_io_err
kaf24@1710 513 movl %eax,%ebx
kaf24@1710 514
kaf24@1710 515 # Okay, its almost a normal NMI tick. We can only process it if:
kaf24@1710 516 # A. We are the outermost Xen activation (in which case we have
kaf24@1710 517 # the selectors safely saved on our stack)
kaf24@1710 518 # B. DS-GS all contain sane Xen values.
kaf24@1710 519 # In all other cases we bail without touching DS-GS, as we have
kaf24@1710 520 # interrupted an enclosing Xen activation in tricky prologue or
kaf24@1710 521 # epilogue code.
kaf24@2954 522 movb XREGS_cs(%esp),%al
kaf24@1710 523 testb $3,%al
kaf24@1710 524 jne do_watchdog_tick
kaf24@2954 525 movl XREGS_ds(%esp),%eax
kaf24@1710 526 cmpw $(__HYPERVISOR_DS),%ax
kaf24@2954 527 jne restore_all_xen
kaf24@2954 528 movl XREGS_es(%esp),%eax
kaf24@1710 529 cmpw $(__HYPERVISOR_DS),%ax
kaf24@2954 530 jne restore_all_xen
kaf24@2954 531 movl XREGS_fs(%esp),%eax
kaf24@1710 532 cmpw $(__HYPERVISOR_DS),%ax
kaf24@2954 533 jne restore_all_xen
kaf24@2954 534 movl XREGS_gs(%esp),%eax
kaf24@1710 535 cmpw $(__HYPERVISOR_DS),%ax
kaf24@2954 536 jne restore_all_xen
kaf24@1710 537
kaf24@1710 538 do_watchdog_tick:
kaf24@1710 539 movl $(__HYPERVISOR_DS),%edx
kaf24@1710 540 movl %edx,%ds
kaf24@1710 541 movl %edx,%es
kaf24@1710 542 movl %esp,%edx
kaf24@1710 543 pushl %ebx # reason
kaf24@1710 544 pushl %edx # regs
kaf24@1710 545 call SYMBOL_NAME(do_nmi)
kaf24@1710 546 addl $8,%esp
kaf24@2954 547 movb XREGS_cs(%esp),%al
kaf24@1710 548 testb $3,%al
kaf24@1710 549 je restore_all_xen
kaf24@1710 550 GET_CURRENT(%ebx)
kaf24@1710 551 jmp restore_all_guest
kaf24@1710 552
kaf24@2085 553 nmi_parity_err:
kaf24@2085 554 # Clear and disable the parity-error line
kaf24@2085 555 andb $0xf,%al
kaf24@2085 556 orb $0x4,%al
kaf24@2085 557 outb %al,$0x61
kaf24@2085 558 cmpb $'i',%ss:SYMBOL_NAME(opt_nmi) # nmi=ignore
kaf24@2954 559 je restore_all_xen
kaf24@2085 560 bts $0,%ss:SYMBOL_NAME(nmi_softirq_reason)
kaf24@2085 561 bts $NMI_SOFTIRQ,%ss:SYMBOL_NAME(irq_stat)
kaf24@2085 562 cmpb $'d',%ss:SYMBOL_NAME(opt_nmi) # nmi=dom0
kaf24@2954 563 je restore_all_xen
kaf24@2085 564 movl $(__HYPERVISOR_DS),%edx # nmi=fatal
kaf24@1710 565 movl %edx,%ds
kaf24@1710 566 movl %edx,%es
kaf24@2079 567 movl %esp,%edx
kaf24@2079 568 push %edx
kaf24@2079 569 call SYMBOL_NAME(mem_parity_error)
kaf24@2085 570 addl $4,%esp
kaf24@2085 571 jmp ret_from_intr
kaf24@2085 572
kaf24@1710 573 nmi_io_err:
kaf24@2085 574 # Clear and disable the I/O-error line
kaf24@2085 575 andb $0xf,%al
kaf24@2085 576 orb $0x8,%al
kaf24@2085 577 outb %al,$0x61
kaf24@2085 578 cmpb $'i',%ss:SYMBOL_NAME(opt_nmi) # nmi=ignore
kaf24@2954 579 je restore_all_xen
kaf24@2085 580 bts $1,%ss:SYMBOL_NAME(nmi_softirq_reason)
kaf24@2085 581 bts $NMI_SOFTIRQ,%ss:SYMBOL_NAME(irq_stat)
kaf24@2085 582 cmpb $'d',%ss:SYMBOL_NAME(opt_nmi) # nmi=dom0
kaf24@2954 583 je restore_all_xen
kaf24@2085 584 movl $(__HYPERVISOR_DS),%edx # nmi=fatal
kaf24@1710 585 movl %edx,%ds
kaf24@1710 586 movl %edx,%es
kaf24@2079 587 movl %esp,%edx
kaf24@2079 588 push %edx
kaf24@2079 589 call SYMBOL_NAME(io_check_error)
kaf24@2085 590 addl $4,%esp
kaf24@2085 591 jmp ret_from_intr
kaf24@2079 592
kaf24@1710 593 .data
kaf24@1710 594 ENTRY(hypercall_table)
kaf24@1710 595 .long SYMBOL_NAME(do_set_trap_table) /* 0 */
kaf24@1710 596 .long SYMBOL_NAME(do_mmu_update)
kaf24@1710 597 .long SYMBOL_NAME(do_set_gdt)
kaf24@1710 598 .long SYMBOL_NAME(do_stack_switch)
kaf24@1710 599 .long SYMBOL_NAME(do_set_callbacks)
kaf24@1710 600 .long SYMBOL_NAME(do_fpu_taskswitch) /* 5 */
kaf24@1710 601 .long SYMBOL_NAME(do_sched_op)
kaf24@1710 602 .long SYMBOL_NAME(do_dom0_op)
kaf24@1710 603 .long SYMBOL_NAME(do_set_debugreg)
kaf24@1710 604 .long SYMBOL_NAME(do_get_debugreg)
kaf24@1710 605 .long SYMBOL_NAME(do_update_descriptor) /* 10 */
kaf24@1710 606 .long SYMBOL_NAME(do_set_fast_trap)
kaf24@1710 607 .long SYMBOL_NAME(do_dom_mem_op)
kaf24@1710 608 .long SYMBOL_NAME(do_multicall)
kaf24@1710 609 .long SYMBOL_NAME(do_update_va_mapping)
kaf24@1710 610 .long SYMBOL_NAME(do_set_timer_op) /* 15 */
kaf24@1710 611 .long SYMBOL_NAME(do_event_channel_op)
kaf24@1710 612 .long SYMBOL_NAME(do_xen_version)
kaf24@1710 613 .long SYMBOL_NAME(do_console_io)
kaf24@1710 614 .long SYMBOL_NAME(do_physdev_op)
kaf24@2375 615 .long SYMBOL_NAME(do_grant_table_op) /* 20 */
kaf24@2111 616 .long SYMBOL_NAME(do_vm_assist)
kaf24@2375 617 .long SYMBOL_NAME(do_update_va_mapping_otherdomain)
kaf24@1710 618 .rept NR_hypercalls-((.-hypercall_table)/4)
kaf24@1710 619 .long SYMBOL_NAME(do_ni_hypercall)
kaf24@1710 620 .endr