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KVM: PPC: Book3S 64: Move interrupt early register setup to KVM 

Like the earlier patch for hcalls, KVM interrupt entry requires a
different calling convention than the Linux interrupt handlers
set up. Move the code that converts from one to the other into KVM.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Fabiano Rosas <farosas@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210528090752.3542186-6-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2021-05-28 19:07:25 +10:00 committed by Michael Ellerman
parent 04ece7b60b
commit 69fdd67499
2 changed files with 71 additions and 110 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

131
arch/powerpc/kernel/exceptions-64s.S
View File

@ -187,7 +187,6 @@ do_define_int n
.endif .endif
.endm .endm
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
/* /*
* All interrupts which set HSRR registers, as well as SRESET and MCE and * All interrupts which set HSRR registers, as well as SRESET and MCE and
* syscall when invoked with "sc 1" switch to MSR[HV]=1 (HVMODE) to be taken, * syscall when invoked with "sc 1" switch to MSR[HV]=1 (HVMODE) to be taken,
@ -220,54 +219,25 @@ do_define_int n
* to KVM to handle. * to KVM to handle.
*/ */
.macro KVMTEST name .macro KVMTEST name handler
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
lbz r10,HSTATE_IN_GUEST(r13) lbz r10,HSTATE_IN_GUEST(r13)
cmpwi r10,0 cmpwi r10,0
bne \name\()_kvm
.endm
.macro GEN_KVM name
.balign IFETCH_ALIGN_BYTES
\name\()_kvm:
BEGIN_FTR_SECTION
ld r10,IAREA+EX_CFAR(r13)
std r10,HSTATE_CFAR(r13)
END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
ld r10,IAREA+EX_CTR(r13)
mtctr r10
BEGIN_FTR_SECTION
ld r10,IAREA+EX_PPR(r13)
std r10,HSTATE_PPR(r13)
END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
ld r11,IAREA+EX_R11(r13)
ld r12,IAREA+EX_R12(r13)
std r12,HSTATE_SCRATCH0(r13)
sldi r12,r9,32
ld r9,IAREA+EX_R9(r13)
ld r10,IAREA+EX_R10(r13)
/* HSRR variants have the 0x2 bit added to their trap number */ /* HSRR variants have the 0x2 bit added to their trap number */
.if IHSRR_IF_HVMODE .if IHSRR_IF_HVMODE
BEGIN_FTR_SECTION BEGIN_FTR_SECTION
ori r12,r12,(IVEC + 0x2) li r10,(IVEC + 0x2)
FTR_SECTION_ELSE FTR_SECTION_ELSE
ori r12,r12,(IVEC) li r10,(IVEC)
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206) ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
.elseif IHSRR .elseif IHSRR
ori r12,r12,(IVEC+ 0x2) li r10,(IVEC + 0x2)
.else .else
ori r12,r12,(IVEC) li r10,(IVEC)
.endif .endif
b kvmppc_interrupt bne \handler
.endm
#else
.macro KVMTEST name
.endm
.macro GEN_KVM name
.endm
#endif #endif
.endm
/* /*
* This is the BOOK3S interrupt entry code macro. * This is the BOOK3S interrupt entry code macro.
@ -409,7 +379,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
DEFINE_FIXED_SYMBOL(\name\()_common_real) DEFINE_FIXED_SYMBOL(\name\()_common_real)
\name\()_common_real: \name\()_common_real:
.if IKVM_REAL .if IKVM_REAL
KVMTEST \name KVMTEST \name kvm_interrupt
.endif .endif
ld r10,PACAKMSR(r13) /* get MSR value for kernel */ ld r10,PACAKMSR(r13) /* get MSR value for kernel */
@ -432,7 +402,7 @@ DEFINE_FIXED_SYMBOL(\name\()_common_real)
DEFINE_FIXED_SYMBOL(\name\()_common_virt) DEFINE_FIXED_SYMBOL(\name\()_common_virt)
\name\()_common_virt: \name\()_common_virt:
.if IKVM_VIRT .if IKVM_VIRT
KVMTEST \name KVMTEST \name kvm_interrupt
1: 1:
.endif .endif
.endif /* IVIRT */ .endif /* IVIRT */
@ -446,7 +416,7 @@ DEFINE_FIXED_SYMBOL(\name\()_common_virt)
DEFINE_FIXED_SYMBOL(\name\()_common_real) DEFINE_FIXED_SYMBOL(\name\()_common_real)
\name\()_common_real: \name\()_common_real:
.if IKVM_REAL .if IKVM_REAL
KVMTEST \name KVMTEST \name kvm_interrupt
.endif .endif
.endm .endm
@ -948,8 +918,6 @@ EXC_COMMON_BEGIN(system_reset_common)
EXCEPTION_RESTORE_REGS EXCEPTION_RESTORE_REGS
RFI_TO_USER_OR_KERNEL RFI_TO_USER_OR_KERNEL
GEN_KVM system_reset
/** /**
* Interrupt 0x200 - Machine Check Interrupt (MCE). * Interrupt 0x200 - Machine Check Interrupt (MCE).
@ -1113,7 +1081,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
/* /*
* Check if we are coming from guest. If yes, then run the normal * Check if we are coming from guest. If yes, then run the normal
* exception handler which will take the * exception handler which will take the
* machine_check_kvm->kvmppc_interrupt branch to deliver the MC event * machine_check_kvm->kvm_interrupt branch to deliver the MC event
* to guest. * to guest.
*/ */
lbz r11,HSTATE_IN_GUEST(r13) lbz r11,HSTATE_IN_GUEST(r13)
@ -1183,8 +1151,6 @@ EXC_COMMON_BEGIN(machine_check_common)
bl machine_check_exception bl machine_check_exception
b interrupt_return b interrupt_return
GEN_KVM machine_check
#ifdef CONFIG_PPC_P7_NAP #ifdef CONFIG_PPC_P7_NAP
/* /*
@ -1319,8 +1285,6 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
REST_NVGPRS(r1) REST_NVGPRS(r1)
b interrupt_return b interrupt_return
GEN_KVM data_access
/** /**
* Interrupt 0x380 - Data Segment Interrupt (DSLB). * Interrupt 0x380 - Data Segment Interrupt (DSLB).
@ -1370,8 +1334,6 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
bl do_bad_slb_fault bl do_bad_slb_fault
b interrupt_return b interrupt_return
GEN_KVM data_access_slb
/** /**
* Interrupt 0x400 - Instruction Storage Interrupt (ISI). * Interrupt 0x400 - Instruction Storage Interrupt (ISI).
@ -1408,8 +1370,6 @@ MMU_FTR_SECTION_ELSE
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX) ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
b interrupt_return b interrupt_return
GEN_KVM instruction_access
/** /**
* Interrupt 0x480 - Instruction Segment Interrupt (ISLB). * Interrupt 0x480 - Instruction Segment Interrupt (ISLB).
@ -1454,8 +1414,6 @@ ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
bl do_bad_slb_fault bl do_bad_slb_fault
b interrupt_return b interrupt_return
GEN_KVM instruction_access_slb
/** /**
* Interrupt 0x500 - External Interrupt. * Interrupt 0x500 - External Interrupt.
@ -1500,8 +1458,6 @@ EXC_COMMON_BEGIN(hardware_interrupt_common)
bl do_IRQ bl do_IRQ
b interrupt_return b interrupt_return
GEN_KVM hardware_interrupt
/** /**
* Interrupt 0x600 - Alignment Interrupt * Interrupt 0x600 - Alignment Interrupt
@ -1529,8 +1485,6 @@ EXC_COMMON_BEGIN(alignment_common)
REST_NVGPRS(r1) /* instruction emulation may change GPRs */ REST_NVGPRS(r1) /* instruction emulation may change GPRs */
b interrupt_return b interrupt_return
GEN_KVM alignment
/** /**
* Interrupt 0x700 - Program Interrupt (program check). * Interrupt 0x700 - Program Interrupt (program check).
@ -1638,8 +1592,6 @@ EXC_COMMON_BEGIN(program_check_common)
REST_NVGPRS(r1) /* instruction emulation may change GPRs */ REST_NVGPRS(r1) /* instruction emulation may change GPRs */
b interrupt_return b interrupt_return
GEN_KVM program_check
/* /*
* Interrupt 0x800 - Floating-Point Unavailable Interrupt. * Interrupt 0x800 - Floating-Point Unavailable Interrupt.
@ -1689,8 +1641,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_TM)
b interrupt_return b interrupt_return
#endif #endif
GEN_KVM fp_unavailable
/** /**
* Interrupt 0x900 - Decrementer Interrupt. * Interrupt 0x900 - Decrementer Interrupt.
@ -1729,8 +1679,6 @@ EXC_COMMON_BEGIN(decrementer_common)
bl timer_interrupt bl timer_interrupt
b interrupt_return b interrupt_return
GEN_KVM decrementer
/** /**
* Interrupt 0x980 - Hypervisor Decrementer Interrupt. * Interrupt 0x980 - Hypervisor Decrementer Interrupt.
@ -1776,8 +1724,6 @@ EXC_COMMON_BEGIN(hdecrementer_common)
ld r13,PACA_EXGEN+EX_R13(r13) ld r13,PACA_EXGEN+EX_R13(r13)
HRFI_TO_KERNEL HRFI_TO_KERNEL
GEN_KVM hdecrementer
/** /**
* Interrupt 0xa00 - Directed Privileged Doorbell Interrupt. * Interrupt 0xa00 - Directed Privileged Doorbell Interrupt.
@ -1817,8 +1763,6 @@ EXC_COMMON_BEGIN(doorbell_super_common)
#endif #endif
b interrupt_return b interrupt_return
GEN_KVM doorbell_super
EXC_REAL_NONE(0xb00, 0x100) EXC_REAL_NONE(0xb00, 0x100)
EXC_VIRT_NONE(0x4b00, 0x100) EXC_VIRT_NONE(0x4b00, 0x100)
@ -1868,7 +1812,7 @@ INT_DEFINE_END(system_call)
GET_PACA(r13) GET_PACA(r13)
std r10,PACA_EXGEN+EX_R10(r13) std r10,PACA_EXGEN+EX_R10(r13)
INTERRUPT_TO_KERNEL INTERRUPT_TO_KERNEL
KVMTEST system_call /* uses r10, branch to system_call_kvm */ KVMTEST system_call kvm_hcall /* uses r10, branch to kvm_hcall */
mfctr r9 mfctr r9
#else #else
mr r9,r13 mr r9,r13
@ -1924,7 +1868,7 @@ EXC_VIRT_BEGIN(system_call, 0x4c00, 0x100)
EXC_VIRT_END(system_call, 0x4c00, 0x100) EXC_VIRT_END(system_call, 0x4c00, 0x100)
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER #ifdef CONFIG_KVM_BOOK3S_64_HANDLER
TRAMP_REAL_BEGIN(system_call_kvm) TRAMP_REAL_BEGIN(kvm_hcall)
mfctr r10 mfctr r10
SET_SCRATCH0(r10) /* Save r13 in SCRATCH0 */ SET_SCRATCH0(r10) /* Save r13 in SCRATCH0 */
#ifdef CONFIG_RELOCATABLE #ifdef CONFIG_RELOCATABLE
@ -1964,8 +1908,6 @@ EXC_COMMON_BEGIN(single_step_common)
bl single_step_exception bl single_step_exception
b interrupt_return b interrupt_return
GEN_KVM single_step
/** /**
* Interrupt 0xe00 - Hypervisor Data Storage Interrupt (HDSI). * Interrupt 0xe00 - Hypervisor Data Storage Interrupt (HDSI).
@ -2004,8 +1946,6 @@ MMU_FTR_SECTION_ELSE
ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_TYPE_RADIX) ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_TYPE_RADIX)
b interrupt_return b interrupt_return
GEN_KVM h_data_storage
/** /**
* Interrupt 0xe20 - Hypervisor Instruction Storage Interrupt (HISI). * Interrupt 0xe20 - Hypervisor Instruction Storage Interrupt (HISI).
@ -2031,8 +1971,6 @@ EXC_COMMON_BEGIN(h_instr_storage_common)
bl unknown_exception bl unknown_exception
b interrupt_return b interrupt_return
GEN_KVM h_instr_storage
/** /**
* Interrupt 0xe40 - Hypervisor Emulation Assistance Interrupt. * Interrupt 0xe40 - Hypervisor Emulation Assistance Interrupt.
@ -2057,8 +1995,6 @@ EXC_COMMON_BEGIN(emulation_assist_common)
REST_NVGPRS(r1) /* instruction emulation may change GPRs */ REST_NVGPRS(r1) /* instruction emulation may change GPRs */
b interrupt_return b interrupt_return
GEN_KVM emulation_assist
/** /**
* Interrupt 0xe60 - Hypervisor Maintenance Interrupt (HMI). * Interrupt 0xe60 - Hypervisor Maintenance Interrupt (HMI).
@ -2130,16 +2066,12 @@ EXC_COMMON_BEGIN(hmi_exception_early_common)
EXCEPTION_RESTORE_REGS hsrr=1 EXCEPTION_RESTORE_REGS hsrr=1
GEN_INT_ENTRY hmi_exception, virt=0 GEN_INT_ENTRY hmi_exception, virt=0
GEN_KVM hmi_exception_early
EXC_COMMON_BEGIN(hmi_exception_common) EXC_COMMON_BEGIN(hmi_exception_common)
GEN_COMMON hmi_exception GEN_COMMON hmi_exception
addi r3,r1,STACK_FRAME_OVERHEAD addi r3,r1,STACK_FRAME_OVERHEAD
bl handle_hmi_exception bl handle_hmi_exception
b interrupt_return b interrupt_return
GEN_KVM hmi_exception
/** /**
* Interrupt 0xe80 - Directed Hypervisor Doorbell Interrupt. * Interrupt 0xe80 - Directed Hypervisor Doorbell Interrupt.
@ -2170,8 +2102,6 @@ EXC_COMMON_BEGIN(h_doorbell_common)
#endif #endif
b interrupt_return b interrupt_return
GEN_KVM h_doorbell
/** /**
* Interrupt 0xea0 - Hypervisor Virtualization Interrupt. * Interrupt 0xea0 - Hypervisor Virtualization Interrupt.
@ -2198,8 +2128,6 @@ EXC_COMMON_BEGIN(h_virt_irq_common)
bl do_IRQ bl do_IRQ
b interrupt_return b interrupt_return
GEN_KVM h_virt_irq
EXC_REAL_NONE(0xec0, 0x20) EXC_REAL_NONE(0xec0, 0x20)
EXC_VIRT_NONE(0x4ec0, 0x20) EXC_VIRT_NONE(0x4ec0, 0x20)
@ -2243,8 +2171,6 @@ EXC_COMMON_BEGIN(performance_monitor_common)
bl performance_monitor_exception bl performance_monitor_exception
b interrupt_return b interrupt_return
GEN_KVM performance_monitor
/** /**
* Interrupt 0xf20 - Vector Unavailable Interrupt. * Interrupt 0xf20 - Vector Unavailable Interrupt.
@ -2294,8 +2220,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
bl altivec_unavailable_exception bl altivec_unavailable_exception
b interrupt_return b interrupt_return
GEN_KVM altivec_unavailable
/** /**
* Interrupt 0xf40 - VSX Unavailable Interrupt. * Interrupt 0xf40 - VSX Unavailable Interrupt.
@ -2344,8 +2268,6 @@ END_FTR_SECTION_IFSET(CPU_FTR_VSX)
bl vsx_unavailable_exception bl vsx_unavailable_exception
b interrupt_return b interrupt_return
GEN_KVM vsx_unavailable
/** /**
* Interrupt 0xf60 - Facility Unavailable Interrupt. * Interrupt 0xf60 - Facility Unavailable Interrupt.
@ -2374,8 +2296,6 @@ EXC_COMMON_BEGIN(facility_unavailable_common)
REST_NVGPRS(r1) /* instruction emulation may change GPRs */ REST_NVGPRS(r1) /* instruction emulation may change GPRs */
b interrupt_return b interrupt_return
GEN_KVM facility_unavailable
/** /**
* Interrupt 0xf60 - Hypervisor Facility Unavailable Interrupt. * Interrupt 0xf60 - Hypervisor Facility Unavailable Interrupt.
@ -2404,8 +2324,6 @@ EXC_COMMON_BEGIN(h_facility_unavailable_common)
REST_NVGPRS(r1) /* XXX Shouldn't be necessary in practice */ REST_NVGPRS(r1) /* XXX Shouldn't be necessary in practice */
b interrupt_return b interrupt_return
GEN_KVM h_facility_unavailable
EXC_REAL_NONE(0xfa0, 0x20) EXC_REAL_NONE(0xfa0, 0x20)
EXC_VIRT_NONE(0x4fa0, 0x20) EXC_VIRT_NONE(0x4fa0, 0x20)
@ -2435,8 +2353,6 @@ EXC_COMMON_BEGIN(cbe_system_error_common)
bl cbe_system_error_exception bl cbe_system_error_exception
b interrupt_return b interrupt_return
GEN_KVM cbe_system_error
#else /* CONFIG_CBE_RAS */ #else /* CONFIG_CBE_RAS */
EXC_REAL_NONE(0x1200, 0x100) EXC_REAL_NONE(0x1200, 0x100)
EXC_VIRT_NONE(0x5200, 0x100) EXC_VIRT_NONE(0x5200, 0x100)
@ -2468,8 +2384,6 @@ EXC_COMMON_BEGIN(instruction_breakpoint_common)
bl instruction_breakpoint_exception bl instruction_breakpoint_exception
b interrupt_return b interrupt_return
GEN_KVM instruction_breakpoint
EXC_REAL_NONE(0x1400, 0x100) EXC_REAL_NONE(0x1400, 0x100)
EXC_VIRT_NONE(0x5400, 0x100) EXC_VIRT_NONE(0x5400, 0x100)
@ -2590,8 +2504,6 @@ EXC_COMMON_BEGIN(denorm_exception_common)
bl unknown_exception bl unknown_exception
b interrupt_return b interrupt_return
GEN_KVM denorm_exception
#ifdef CONFIG_CBE_RAS #ifdef CONFIG_CBE_RAS
INT_DEFINE_BEGIN(cbe_maintenance) INT_DEFINE_BEGIN(cbe_maintenance)
@ -2609,8 +2521,6 @@ EXC_COMMON_BEGIN(cbe_maintenance_common)
bl cbe_maintenance_exception bl cbe_maintenance_exception
b interrupt_return b interrupt_return
GEN_KVM cbe_maintenance
#else /* CONFIG_CBE_RAS */ #else /* CONFIG_CBE_RAS */
EXC_REAL_NONE(0x1600, 0x100) EXC_REAL_NONE(0x1600, 0x100)
EXC_VIRT_NONE(0x5600, 0x100) EXC_VIRT_NONE(0x5600, 0x100)
@ -2641,8 +2551,6 @@ EXC_COMMON_BEGIN(altivec_assist_common)
#endif #endif
b interrupt_return b interrupt_return
GEN_KVM altivec_assist
#ifdef CONFIG_CBE_RAS #ifdef CONFIG_CBE_RAS
INT_DEFINE_BEGIN(cbe_thermal) INT_DEFINE_BEGIN(cbe_thermal)
@ -2660,8 +2568,6 @@ EXC_COMMON_BEGIN(cbe_thermal_common)
bl cbe_thermal_exception bl cbe_thermal_exception
b interrupt_return b interrupt_return
GEN_KVM cbe_thermal
#else /* CONFIG_CBE_RAS */ #else /* CONFIG_CBE_RAS */
EXC_REAL_NONE(0x1800, 0x100) EXC_REAL_NONE(0x1800, 0x100)
EXC_VIRT_NONE(0x5800, 0x100) EXC_VIRT_NONE(0x5800, 0x100)
@ -2914,6 +2820,15 @@ TRAMP_REAL_BEGIN(rfscv_flush_fallback)
USE_TEXT_SECTION() USE_TEXT_SECTION()
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
kvm_interrupt:
/*
* The conditional branch in KVMTEST can't reach all the way,
* make a stub.
*/
b kvmppc_interrupt
#endif
_GLOBAL(do_uaccess_flush) _GLOBAL(do_uaccess_flush)
UACCESS_FLUSH_FIXUP_SECTION UACCESS_FLUSH_FIXUP_SECTION
nop nop

50
arch/powerpc/kvm/book3s_64_entry.S
View File

@ -44,15 +44,61 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
sldi r12,r10,32 sldi r12,r10,32
ori r12,r12,0xc00 ori r12,r12,0xc00
ld r10,PACA_EXGEN+EX_R10(r13) ld r10,PACA_EXGEN+EX_R10(r13)
b do_kvm_interrupt
/*
* KVM interrupt entry occurs after GEN_INT_ENTRY runs, and follows that
* call convention:
*
* guest R9-R13, CTR, CFAR, PPR saved in PACA EX_xxx save area
* guest (H)DAR, (H)DSISR are also in the save area for relevant interrupts
* guest R13 also saved in SCRATCH0
* R13 = PACA
* R11 = (H)SRR0
* R12 = (H)SRR1
* R9 = guest CR
* PPR is set to medium
*
* With the addition for KVM:
* R10 = trap vector
*/
.global kvmppc_interrupt .global kvmppc_interrupt
.balign IFETCH_ALIGN_BYTES .balign IFETCH_ALIGN_BYTES
kvmppc_interrupt: kvmppc_interrupt:
li r11,PACA_EXGEN
cmpdi r10,0x200
bgt+ 1f
li r11,PACA_EXMC
beq 1f
li r11,PACA_EXNMI
1: add r11,r11,r13
BEGIN_FTR_SECTION
ld r12,EX_CFAR(r11)
std r12,HSTATE_CFAR(r13)
END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
ld r12,EX_CTR(r11)
mtctr r12
BEGIN_FTR_SECTION
ld r12,EX_PPR(r11)
std r12,HSTATE_PPR(r13)
END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
ld r12,EX_R12(r11)
std r12,HSTATE_SCRATCH0(r13)
sldi r12,r9,32
or r12,r12,r10
ld r9,EX_R9(r11)
ld r10,EX_R10(r11)
ld r11,EX_R11(r11)
do_kvm_interrupt:
/* /*
* Register contents: * Hcalls and other interrupts come here after normalising register
* contents and save locations:
*
* R12 = (guest CR << 32) | interrupt vector * R12 = (guest CR << 32) | interrupt vector
* R13 = PACA * R13 = PACA
* guest R12 saved in shadow VCPU SCRATCH0 * guest R12 saved in shadow HSTATE_SCRATCH0
* guest R13 saved in SPRN_SCRATCH0 * guest R13 saved in SPRN_SCRATCH0
*/ */
std r9,HSTATE_SCRATCH2(r13) std r9,HSTATE_SCRATCH2(r13)