ivt.s

xen 3.2.2 源码

	tnat.nz p8,p0=in7
	nop.i 0

	mov r13=r2				// establish `current'
	movl r1=__gp				// establish kernel global pointer
	;;
	st8 [r16]=r8		// ensure pt_regs.r8 != 0 (see handle_syscall_error)
(p13)	mov in6=-1
(p8)	mov in7=-1

	cmp.eq pSys,pNonSys=r0,r0		// set pSys=1, pNonSys=0
	movl r17=FPSR_DEFAULT
	;;
	mov.m ar.fpsr=r17			// set ar.fpsr to kernel default value
(p10)	mov r8=-EINVAL
	br.ret.sptk.many b7
END(ia64_syscall_setup)

	
	.org ia64_ivt+0x3c00
//////////////////////////////////////////////////////////////////////////
// 0x3c00 Entry 15 (size 64 bundles) Reserved
	DBG_FAULT(15)
	FAULT(15)


	.org ia64_ivt+0x4000
//////////////////////////////////////////////////////////////////////////
// 0x4000 Entry 16 (size 64 bundles) Reserved
	DBG_FAULT(16)
	FAULT(16)

	// There is no particular reason for this code to be here, other
	// than that there happens to be space here that would go unused 
	// otherwise.  If this fault ever gets "unreserved", simply move
	// the following code to a more suitable spot...

ENTRY(dispatch_privop_fault)
	SAVE_MIN_WITH_COVER
	;;
	alloc r14=ar.pfs,0,0,4,0	// now it's safe (must be first in
					//   insn group!)
	mov out0=cr.ifa
	adds out1=16,sp
	mov out2=cr.isr		// FIXME: pity to make this slow access twice
	mov out3=cr.itir

	ssm psr.ic | PSR_DEFAULT_BITS
	;;
	srlz.i				// guarantee that interruption 
					//   collection is on
	;;
(p15)	ssm psr.i			// restore psr.i
	adds r3=8,r2			// set up second base pointer
	;;
	SAVE_REST
	movl r14=ia64_leave_kernel
	;;
	mov rp=r14
     	br.call.sptk.many b6=ia64_handle_privop
END(dispatch_privop_fault)


	.org ia64_ivt+0x4400
//////////////////////////////////////////////////////////////////////////
// 0x4400 Entry 17 (size 64 bundles) Reserved
	DBG_FAULT(17)
	FAULT(17)


	.org ia64_ivt+0x4800
//////////////////////////////////////////////////////////////////////////
// 0x4800 Entry 18 (size 64 bundles) Reserved
	DBG_FAULT(18)
	FAULT(18)


	.org ia64_ivt+0x4c00
//////////////////////////////////////////////////////////////////////////
// 0x4c00 Entry 19 (size 64 bundles) Reserved
	DBG_FAULT(19)
	FAULT(19)

	/*
	 * There is no particular reason for this code to be here, other 
	 * than that there happens to be space here that would go unused 
	 * otherwise.  If this fault ever gets "unreserved", simply move
	 * the following code to a more suitable spot...
	 */

GLOBAL_ENTRY(dispatch_to_fault_handler)
	/*
	 * Input:
	 *	psr.ic:	off
	 *	r19:	fault vector number (e.g., 24 for General Exception)
	 *	r31:	contains saved predicates (pr)
	 */
	SAVE_MIN_WITH_COVER_R19
	alloc r14=ar.pfs,0,0,5,0
	mov out0=r15
	mov out1=cr.isr
	mov out2=cr.ifa
	mov out3=cr.iim
	mov out4=cr.itir
	;;
	ssm psr.ic | PSR_DEFAULT_BITS
	;;
	srlz.i				// guarantee that interruption 
					//   collection is on
	;;
(p15)	ssm psr.i			// restore psr.i
	adds r3=8,r2			// set up second base pointer for
					//   SAVE_REST
	;;
	SAVE_REST
	movl r14=ia64_leave_kernel
	;;
	mov rp=r14
	br.call.sptk.many b6=ia64_fault
END(dispatch_to_fault_handler)

//
// --- End of long entries, Beginning of short entries
//

	.org ia64_ivt+0x5000
//////////////////////////////////////////////////////////////////////////
// 0x5000 Entry 20 (size 16 bundles) Page Not Present (10,22,49)
ENTRY(page_not_present)
	DBG_FAULT(20)
	FAULT_OR_REFLECT(20)
END(page_not_present)

	.org ia64_ivt+0x5100
//////////////////////////////////////////////////////////////////////////
// 0x5100 Entry 21 (size 16 bundles) Key Permission (13,25,52)
ENTRY(key_permission)
	DBG_FAULT(21)
	FAULT_OR_REFLECT(21)
END(key_permission)

	.org ia64_ivt+0x5200
//////////////////////////////////////////////////////////////////////////
// 0x5200 Entry 22 (size 16 bundles) Instruction Access Rights (26)
ENTRY(iaccess_rights)
	DBG_FAULT(22)
	FAULT_OR_REFLECT(22)
END(iaccess_rights)

	.org ia64_ivt+0x5300
//////////////////////////////////////////////////////////////////////////
// 0x5300 Entry 23 (size 16 bundles) Data Access Rights (14,53)
ENTRY(daccess_rights)
	DBG_FAULT(23)
	mov r31=pr
	mov r16=cr.isr
	mov r17=cr.ifa
	mov r19=23
	mov r20=0x5300
	br.sptk.many fast_access_reflect
	;;
END(daccess_rights)

	.org ia64_ivt+0x5400
//////////////////////////////////////////////////////////////////////////
// 0x5400 Entry 24 (size 16 bundles) General Exception (5,32,34,36,38,39)
ENTRY(general_exception)
	DBG_FAULT(24)
	mov r16=cr.isr
	mov r31=pr
	;;
	cmp4.ge p6,p0=0x20,r16
(p6)	br.sptk.many dispatch_privop_fault
	;;
	FAULT_OR_REFLECT(24)
END(general_exception)

	.org ia64_ivt+0x5500
//////////////////////////////////////////////////////////////////////////
// 0x5500 Entry 25 (size 16 bundles) Disabled FP-Register (35)
ENTRY(disabled_fp_reg)
	DBG_FAULT(25)
	FAULT_OR_REFLECT(25)
END(disabled_fp_reg)

	.org ia64_ivt+0x5600
//////////////////////////////////////////////////////////////////////////
// 0x5600 Entry 26 (size 16 bundles) Nat Consumption (11,23,37,50)
ENTRY(nat_consumption)
	DBG_FAULT(26)
	FAULT_OR_REFLECT(26)
END(nat_consumption)

	.org ia64_ivt+0x5700
//////////////////////////////////////////////////////////////////////////
// 0x5700 Entry 27 (size 16 bundles) Speculation (40)
ENTRY(speculation_vector)
	DBG_FAULT(27)
	// this probably need not reflect...
	FAULT_OR_REFLECT(27)
END(speculation_vector)

	.org ia64_ivt+0x5800
//////////////////////////////////////////////////////////////////////////
// 0x5800 Entry 28 (size 16 bundles) Reserved
	DBG_FAULT(28)
	FAULT(28)

	.org ia64_ivt+0x5900
//////////////////////////////////////////////////////////////////////////
// 0x5900 Entry 29 (size 16 bundles) Debug (16,28,56)
ENTRY(debug_vector)
	DBG_FAULT(29)
	FAULT_OR_REFLECT(29)
END(debug_vector)

	.org ia64_ivt+0x5a00
//////////////////////////////////////////////////////////////////////////
// 0x5a00 Entry 30 (size 16 bundles) Unaligned Reference (57)
ENTRY(unaligned_access)
	DBG_FAULT(30)
	FAULT_OR_REFLECT(30)
END(unaligned_access)

	.org ia64_ivt+0x5b00
//////////////////////////////////////////////////////////////////////////
// 0x5b00 Entry 31 (size 16 bundles) Unsupported Data Reference (57)
ENTRY(unsupported_data_reference)
	DBG_FAULT(31)
	FAULT_OR_REFLECT(31)
END(unsupported_data_reference)

	.org ia64_ivt+0x5c00
//////////////////////////////////////////////////////////////////////////
// 0x5c00 Entry 32 (size 16 bundles) Floating-Point Fault (64)
ENTRY(floating_point_fault)
	DBG_FAULT(32)
	FAULT_OR_REFLECT(32)
END(floating_point_fault)

	.org ia64_ivt+0x5d00
//////////////////////////////////////////////////////////////////////////
// 0x5d00 Entry 33 (size 16 bundles) Floating Point Trap (66)
ENTRY(floating_point_trap)
	DBG_FAULT(33)
	FAULT_OR_REFLECT(33)
END(floating_point_trap)

	.org ia64_ivt+0x5e00
//////////////////////////////////////////////////////////////////////////
// 0x5e00 Entry 34 (size 16 bundles) Lower Privilege Transfer Trap (66)
ENTRY(lower_privilege_trap)
	DBG_FAULT(34)
	FAULT_OR_REFLECT(34)
END(lower_privilege_trap)

	.org ia64_ivt+0x5f00
//////////////////////////////////////////////////////////////////////////
// 0x5f00 Entry 35 (size 16 bundles) Taken Branch Trap (68)
ENTRY(taken_branch_trap)
	DBG_FAULT(35)
	FAULT_OR_REFLECT(35)
END(taken_branch_trap)

	.org ia64_ivt+0x6000
//////////////////////////////////////////////////////////////////////////
// 0x6000 Entry 36 (size 16 bundles) Single Step Trap (69)
ENTRY(single_step_trap)
	DBG_FAULT(36)
	FAULT_OR_REFLECT(36)
END(single_step_trap)

	.org ia64_ivt+0x6100
//////////////////////////////////////////////////////////////////////////
// 0x6100 Entry 37 (size 16 bundles) Reserved
	DBG_FAULT(37)
	FAULT(37)

	.org ia64_ivt+0x6200
//////////////////////////////////////////////////////////////////////////
// 0x6200 Entry 38 (size 16 bundles) Reserved
	DBG_FAULT(38)
	FAULT(38)

	.org ia64_ivt+0x6300
//////////////////////////////////////////////////////////////////////////
// 0x6300 Entry 39 (size 16 bundles) Reserved
	DBG_FAULT(39)
	FAULT(39)

	.org ia64_ivt+0x6400
//////////////////////////////////////////////////////////////////////////
// 0x6400 Entry 40 (size 16 bundles) Reserved
	DBG_FAULT(40)
	FAULT(40)

	.org ia64_ivt+0x6500
//////////////////////////////////////////////////////////////////////////
// 0x6500 Entry 41 (size 16 bundles) Reserved
	DBG_FAULT(41)
	FAULT(41)

	.org ia64_ivt+0x6600
//////////////////////////////////////////////////////////////////////////
// 0x6600 Entry 42 (size 16 bundles) Reserved
	DBG_FAULT(42)
	FAULT(42)

	.org ia64_ivt+0x6700
//////////////////////////////////////////////////////////////////////////
// 0x6700 Entry 43 (size 16 bundles) Reserved
	DBG_FAULT(43)
	FAULT(43)

	.org ia64_ivt+0x6800
//////////////////////////////////////////////////////////////////////////
// 0x6800 Entry 44 (size 16 bundles) Reserved
	DBG_FAULT(44)
	FAULT(44)

	.org ia64_ivt+0x6900
//////////////////////////////////////////////////////////////////////////
// 0x6900 Entry 45 (size 16 bundles) IA-32 Exeception (17,18,29,41,42,43,
//						       44,58,60,61,62,72,
//						       73,75,76,77)
ENTRY(ia32_exception)
	DBG_FAULT(45)
	FAULT_OR_REFLECT(45)
END(ia32_exception)

	.org ia64_ivt+0x6a00
//////////////////////////////////////////////////////////////////////////
// 0x6a00 Entry 46 (size 16 bundles) IA-32 Intercept  (30,31,59,70,71)
ENTRY(ia32_intercept)
	DBG_FAULT(46)
	FAULT_OR_REFLECT(46)
END(ia32_intercept)

	.org ia64_ivt+0x6b00
//////////////////////////////////////////////////////////////////////////
// 0x6b00 Entry 47 (size 16 bundles) IA-32 Interrupt  (74)
ENTRY(ia32_interrupt)
	DBG_FAULT(47)
	FAULT_OR_REFLECT(47)
END(ia32_interrupt)

	.org ia64_ivt+0x6c00
//////////////////////////////////////////////////////////////////////////
// 0x6c00 Entry 48 (size 16 bundles) Reserved
	DBG_FAULT(48)
	FAULT(48)

	.org ia64_ivt+0x6d00
//////////////////////////////////////////////////////////////////////////
// 0x6d00 Entry 49 (size 16 bundles) Reserved
	DBG_FAULT(49)
	FAULT(49)

	.org ia64_ivt+0x6e00
//////////////////////////////////////////////////////////////////////////
// 0x6e00 Entry 50 (size 16 bundles) Reserved
	DBG_FAULT(50)
	FAULT(50)

	.org ia64_ivt+0x6f00
//////////////////////////////////////////////////////////////////////////
// 0x6f00 Entry 51 (size 16 bundles) Reserved
	DBG_FAULT(51)
	FAULT(51)

	.org ia64_ivt+0x7000
//////////////////////////////////////////////////////////////////////////
// 0x7000 Entry 52 (size 16 bundles) Reserved
	DBG_FAULT(52)
	FAULT(52)

	.org ia64_ivt+0x7100
//////////////////////////////////////////////////////////////////////////
// 0x7100 Entry 53 (size 16 bundles) Reserved
	DBG_FAULT(53)
	FAULT(53)

	.org ia64_ivt+0x7200
//////////////////////////////////////////////////////////////////////////
// 0x7200 Entry 54 (size 16 bundles) Reserved
	DBG_FAULT(54)
	FAULT(54)

	.org ia64_ivt+0x7300
//////////////////////////////////////////////////////////////////////////
// 0x7300 Entry 55 (size 16 bundles) Reserved
	DBG_FAULT(55)
	FAULT(55)

	.org ia64_ivt+0x7400
//////////////////////////////////////////////////////////////////////////
// 0x7400 Entry 56 (size 16 bundles) Reserved
	DBG_FAULT(56)
	FAULT(56)

	.org ia64_ivt+0x7500
//////////////////////////////////////////////////////////////////////////
// 0x7500 Entry 57 (size 16 bundles) Reserved
	DBG_FAULT(57)
	FAULT(57)

	.org ia64_ivt+0x7600
//////////////////////////////////////////////////////////////////////////
// 0x7600 Entry 58 (size 16 bundles) Reserved
	DBG_FAULT(58)
	FAULT(58)

	.org ia64_ivt+0x7700
//////////////////////////////////////////////////////////////////////////
// 0x7700 Entry 59 (size 16 bundles) Reserved
	DBG_FAULT(59)
	FAULT(59)

	.org ia64_ivt+0x7800
//////////////////////////////////////////////////////////////////////////
// 0x7800 Entry 60 (size 16 bundles) Reserved
	DBG_FAULT(60)
	FAULT(60)

	.org ia64_ivt+0x7900
//////////////////////////////////////////////////////////////////////////
// 0x7900 Entry 61 (size 16 bundles) Reserved
	DBG_FAULT(61)
	FAULT(61)

	.org ia64_ivt+0x7a00
//////////////////////////////////////////////////////////////////////////
// 0x7a00 Entry 62 (size 16 bundles) Reserved
	DBG_FAULT(62)
	FAULT(62)

	.org ia64_ivt+0x7b00
//////////////////////////////////////////////////////////////////////////
// 0x7b00 Entry 63 (size 16 bundles) Reserved
	DBG_FAULT(63)
	FAULT(63)

	.org ia64_ivt+0x7c00
//////////////////////////////////////////////////////////////////////////
// 0x7c00 Entry 64 (size 16 bundles) Reserved
	DBG_FAULT(64)
	FAULT(64)

	.org ia64_ivt+0x7d00
//////////////////////////////////////////////////////////////////////////
// 0x7d00 Entry 65 (size 16 bundles) Reserved
	DBG_FAULT(65)
	FAULT(65)

	.org ia64_ivt+0x7e00
//////////////////////////////////////////////////////////////////////////
// 0x7e00 Entry 66 (size 16 bundles) Reserved
	DBG_FAULT(66)
	FAULT(66)

	.org ia64_ivt+0x7f00
//////////////////////////////////////////////////////////////////////////
// 0x7f00 Entry 67 (size 16 bundles) Reserved
	DBG_FAULT(67)
	FAULT(67)

	.org ia64_ivt+0x8000