1598 lines
43 KiB
ArmAsm
1598 lines
43 KiB
ArmAsm
/*
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* This file contains the 64-bit "server" PowerPC variant
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* of the low level exception handling including exception
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* vectors, exception return, part of the slb and stab
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* handling and other fixed offset specific things.
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*
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* This file is meant to be #included from head_64.S due to
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* position dependent assembly.
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*
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* Most of this originates from head_64.S and thus has the same
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* copyright history.
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*
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*/
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#include <asm/hw_irq.h>
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#include <asm/exception-64s.h>
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#include <asm/ptrace.h>
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#include <asm/cpuidle.h>
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/*
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* We layout physical memory as follows:
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* 0x0000 - 0x00ff : Secondary processor spin code
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* 0x0100 - 0x17ff : pSeries Interrupt prologs
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* 0x1800 - 0x4000 : interrupt support common interrupt prologs
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* 0x4000 - 0x5fff : pSeries interrupts with IR=1,DR=1
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* 0x6000 - 0x6fff : more interrupt support including for IR=1,DR=1
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* 0x7000 - 0x7fff : FWNMI data area
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* 0x8000 - 0x8fff : Initial (CPU0) segment table
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* 0x9000 - : Early init and support code
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*/
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/* Syscall routine is used twice, in reloc-off and reloc-on paths */
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#define SYSCALL_PSERIES_1 \
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BEGIN_FTR_SECTION \
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cmpdi r0,0x1ebe ; \
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beq- 1f ; \
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END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE) \
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mr r9,r13 ; \
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GET_PACA(r13) ; \
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mfspr r11,SPRN_SRR0 ; \
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0:
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#define SYSCALL_PSERIES_2_RFID \
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mfspr r12,SPRN_SRR1 ; \
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ld r10,PACAKBASE(r13) ; \
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LOAD_HANDLER(r10, system_call_entry) ; \
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mtspr SPRN_SRR0,r10 ; \
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ld r10,PACAKMSR(r13) ; \
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mtspr SPRN_SRR1,r10 ; \
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rfid ; \
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b . ; /* prevent speculative execution */
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#define SYSCALL_PSERIES_3 \
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/* Fast LE/BE switch system call */ \
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1: mfspr r12,SPRN_SRR1 ; \
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xori r12,r12,MSR_LE ; \
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mtspr SPRN_SRR1,r12 ; \
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rfid ; /* return to userspace */ \
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b . ; /* prevent speculative execution */
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#if defined(CONFIG_RELOCATABLE)
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/*
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* We can't branch directly so we do it via the CTR which
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* is volatile across system calls.
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*/
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#define SYSCALL_PSERIES_2_DIRECT \
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mflr r10 ; \
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ld r12,PACAKBASE(r13) ; \
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LOAD_HANDLER(r12, system_call_entry) ; \
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mtctr r12 ; \
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mfspr r12,SPRN_SRR1 ; \
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/* Re-use of r13... No spare regs to do this */ \
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li r13,MSR_RI ; \
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mtmsrd r13,1 ; \
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GET_PACA(r13) ; /* get r13 back */ \
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bctr ;
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#else
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/* We can branch directly */
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#define SYSCALL_PSERIES_2_DIRECT \
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mfspr r12,SPRN_SRR1 ; \
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li r10,MSR_RI ; \
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mtmsrd r10,1 ; /* Set RI (EE=0) */ \
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b system_call_common ;
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#endif
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/*
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* This is the start of the interrupt handlers for pSeries
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* This code runs with relocation off.
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* Code from here to __end_interrupts gets copied down to real
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* address 0x100 when we are running a relocatable kernel.
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* Therefore any relative branches in this section must only
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* branch to labels in this section.
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*/
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. = 0x100
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.globl __start_interrupts
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__start_interrupts:
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.globl system_reset_pSeries;
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system_reset_pSeries:
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SET_SCRATCH0(r13)
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#ifdef CONFIG_PPC_P7_NAP
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BEGIN_FTR_SECTION
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/* Running native on arch 2.06 or later, check if we are
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* waking up from nap/sleep/winkle.
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*/
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mfspr r13,SPRN_SRR1
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rlwinm. r13,r13,47-31,30,31
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beq 9f
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cmpwi cr3,r13,2
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GET_PACA(r13)
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bl pnv_restore_hyp_resource
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li r0,PNV_THREAD_RUNNING
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stb r0,PACA_THREAD_IDLE_STATE(r13) /* Clear thread state */
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#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
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li r0,KVM_HWTHREAD_IN_KERNEL
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stb r0,HSTATE_HWTHREAD_STATE(r13)
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/* Order setting hwthread_state vs. testing hwthread_req */
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sync
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lbz r0,HSTATE_HWTHREAD_REQ(r13)
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cmpwi r0,0
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beq 1f
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b kvm_start_guest
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1:
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#endif
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/* Return SRR1 from power7_nap() */
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mfspr r3,SPRN_SRR1
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blt cr3,2f
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b pnv_wakeup_loss
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2: b pnv_wakeup_noloss
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9:
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END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
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#endif /* CONFIG_PPC_P7_NAP */
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EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
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NOTEST, 0x100)
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. = 0x200
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machine_check_pSeries_1:
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/* This is moved out of line as it can be patched by FW, but
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* some code path might still want to branch into the original
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* vector
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*/
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SET_SCRATCH0(r13) /* save r13 */
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#ifdef CONFIG_PPC_P7_NAP
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BEGIN_FTR_SECTION
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/* Running native on arch 2.06 or later, check if we are
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* waking up from nap. We only handle no state loss and
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* supervisor state loss. We do -not- handle hypervisor
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* state loss at this time.
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*/
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mfspr r13,SPRN_SRR1
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rlwinm. r13,r13,47-31,30,31
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OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
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beq 9f
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mfspr r13,SPRN_SRR1
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rlwinm. r13,r13,47-31,30,31
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/* waking up from powersave (nap) state */
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cmpwi cr1,r13,2
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/* Total loss of HV state is fatal. let's just stay stuck here */
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OPT_GET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
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bgt cr1,.
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9:
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OPT_SET_SPR(r13, SPRN_CFAR, CPU_FTR_CFAR)
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END_FTR_SECTION_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
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#endif /* CONFIG_PPC_P7_NAP */
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EXCEPTION_PROLOG_0(PACA_EXMC)
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BEGIN_FTR_SECTION
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b machine_check_powernv_early
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FTR_SECTION_ELSE
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b machine_check_pSeries_0
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ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
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. = 0x300
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.globl data_access_pSeries
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data_access_pSeries:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, data_access_common, EXC_STD,
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KVMTEST, 0x300)
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. = 0x380
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.globl data_access_slb_pSeries
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data_access_slb_pSeries:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXSLB)
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EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x380)
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std r3,PACA_EXSLB+EX_R3(r13)
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mfspr r3,SPRN_DAR
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mfspr r12,SPRN_SRR1
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#ifndef CONFIG_RELOCATABLE
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b slb_miss_realmode
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#else
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/*
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* We can't just use a direct branch to slb_miss_realmode
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* because the distance from here to there depends on where
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* the kernel ends up being put.
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*/
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mfctr r11
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ld r10,PACAKBASE(r13)
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LOAD_HANDLER(r10, slb_miss_realmode)
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mtctr r10
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bctr
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#endif
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STD_EXCEPTION_PSERIES(0x400, instruction_access)
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. = 0x480
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.globl instruction_access_slb_pSeries
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instruction_access_slb_pSeries:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXSLB)
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EXCEPTION_PROLOG_1(PACA_EXSLB, KVMTEST, 0x480)
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std r3,PACA_EXSLB+EX_R3(r13)
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mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
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mfspr r12,SPRN_SRR1
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#ifndef CONFIG_RELOCATABLE
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b slb_miss_realmode
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#else
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mfctr r11
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ld r10,PACAKBASE(r13)
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LOAD_HANDLER(r10, slb_miss_realmode)
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mtctr r10
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bctr
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#endif
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/* We open code these as we can't have a ". = x" (even with
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* x = "." within a feature section
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*/
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. = 0x500;
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.globl hardware_interrupt_pSeries;
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.globl hardware_interrupt_hv;
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hardware_interrupt_pSeries:
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hardware_interrupt_hv:
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BEGIN_FTR_SECTION
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_MASKABLE_EXCEPTION_PSERIES(0x502, hardware_interrupt,
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EXC_HV, SOFTEN_TEST_HV)
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KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x502)
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FTR_SECTION_ELSE
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_MASKABLE_EXCEPTION_PSERIES(0x500, hardware_interrupt,
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EXC_STD, SOFTEN_TEST_PR)
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KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x500)
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ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE | CPU_FTR_ARCH_206)
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STD_EXCEPTION_PSERIES(0x600, alignment)
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KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x600)
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STD_EXCEPTION_PSERIES(0x700, program_check)
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KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x700)
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STD_EXCEPTION_PSERIES(0x800, fp_unavailable)
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KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x800)
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. = 0x900
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.globl decrementer_pSeries
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decrementer_pSeries:
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_MASKABLE_EXCEPTION_PSERIES(0x900, decrementer, EXC_STD, SOFTEN_TEST_PR)
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STD_EXCEPTION_HV(0x980, 0x982, hdecrementer)
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MASKABLE_EXCEPTION_PSERIES(0xa00, 0xa00, doorbell_super)
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KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xa00)
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STD_EXCEPTION_PSERIES(0xb00, trap_0b)
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KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xb00)
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. = 0xc00
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.globl system_call_pSeries
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system_call_pSeries:
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/*
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* If CONFIG_KVM_BOOK3S_64_HANDLER is set, save the PPR (on systems
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* that support it) before changing to HMT_MEDIUM. That allows the KVM
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* code to save that value into the guest state (it is the guest's PPR
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* value). Otherwise just change to HMT_MEDIUM as userspace has
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* already saved the PPR.
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*/
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#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
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SET_SCRATCH0(r13)
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GET_PACA(r13)
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std r9,PACA_EXGEN+EX_R9(r13)
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OPT_GET_SPR(r9, SPRN_PPR, CPU_FTR_HAS_PPR);
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HMT_MEDIUM;
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std r10,PACA_EXGEN+EX_R10(r13)
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OPT_SAVE_REG_TO_PACA(PACA_EXGEN+EX_PPR, r9, CPU_FTR_HAS_PPR);
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mfcr r9
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KVMTEST(0xc00)
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GET_SCRATCH0(r13)
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#else
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HMT_MEDIUM;
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#endif
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SYSCALL_PSERIES_1
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SYSCALL_PSERIES_2_RFID
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SYSCALL_PSERIES_3
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KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xc00)
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STD_EXCEPTION_PSERIES(0xd00, single_step)
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KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xd00)
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/* At 0xe??? we have a bunch of hypervisor exceptions, we branch
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* out of line to handle them
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*/
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. = 0xe00
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hv_data_storage_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b h_data_storage_hv
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. = 0xe20
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hv_instr_storage_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b h_instr_storage_hv
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. = 0xe40
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emulation_assist_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b emulation_assist_hv
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. = 0xe60
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hv_exception_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b hmi_exception_early
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. = 0xe80
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hv_doorbell_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b h_doorbell_hv
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. = 0xea0
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hv_virt_irq_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b h_virt_irq_hv
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/* We need to deal with the Altivec unavailable exception
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* here which is at 0xf20, thus in the middle of the
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* prolog code of the PerformanceMonitor one. A little
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* trickery is thus necessary
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*/
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. = 0xf00
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performance_monitor_pseries_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b performance_monitor_pSeries
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. = 0xf20
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altivec_unavailable_pseries_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b altivec_unavailable_pSeries
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. = 0xf40
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vsx_unavailable_pseries_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b vsx_unavailable_pSeries
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. = 0xf60
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facility_unavailable_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b facility_unavailable_pSeries
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. = 0xf80
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hv_facility_unavailable_trampoline:
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SET_SCRATCH0(r13)
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EXCEPTION_PROLOG_0(PACA_EXGEN)
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b facility_unavailable_hv
|
|
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#ifdef CONFIG_CBE_RAS
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STD_EXCEPTION_HV(0x1200, 0x1202, cbe_system_error)
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KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1202)
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#endif /* CONFIG_CBE_RAS */
|
|
|
|
STD_EXCEPTION_PSERIES(0x1300, instruction_breakpoint)
|
|
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1300)
|
|
|
|
. = 0x1500
|
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.global denorm_exception_hv
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denorm_exception_hv:
|
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mtspr SPRN_SPRG_HSCRATCH0,r13
|
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EXCEPTION_PROLOG_0(PACA_EXGEN)
|
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EXCEPTION_PROLOG_1(PACA_EXGEN, NOTEST, 0x1500)
|
|
|
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#ifdef CONFIG_PPC_DENORMALISATION
|
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mfspr r10,SPRN_HSRR1
|
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mfspr r11,SPRN_HSRR0 /* save HSRR0 */
|
|
andis. r10,r10,(HSRR1_DENORM)@h /* denorm? */
|
|
addi r11,r11,-4 /* HSRR0 is next instruction */
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bne+ denorm_assist
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|
#endif
|
|
|
|
KVMTEST(0x1500)
|
|
EXCEPTION_PROLOG_PSERIES_1(denorm_common, EXC_HV)
|
|
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x1500)
|
|
|
|
#ifdef CONFIG_CBE_RAS
|
|
STD_EXCEPTION_HV(0x1600, 0x1602, cbe_maintenance)
|
|
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1602)
|
|
#endif /* CONFIG_CBE_RAS */
|
|
|
|
STD_EXCEPTION_PSERIES(0x1700, altivec_assist)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x1700)
|
|
|
|
#ifdef CONFIG_CBE_RAS
|
|
STD_EXCEPTION_HV(0x1800, 0x1802, cbe_thermal)
|
|
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0x1802)
|
|
#else
|
|
. = 0x1800
|
|
#endif /* CONFIG_CBE_RAS */
|
|
|
|
|
|
/*** Out of line interrupts support ***/
|
|
|
|
.align 7
|
|
/* moved from 0x200 */
|
|
machine_check_powernv_early:
|
|
BEGIN_FTR_SECTION
|
|
EXCEPTION_PROLOG_1(PACA_EXMC, NOTEST, 0x200)
|
|
/*
|
|
* Register contents:
|
|
* R13 = PACA
|
|
* R9 = CR
|
|
* Original R9 to R13 is saved on PACA_EXMC
|
|
*
|
|
* Switch to mc_emergency stack and handle re-entrancy (we limit
|
|
* the nested MCE upto level 4 to avoid stack overflow).
|
|
* Save MCE registers srr1, srr0, dar and dsisr and then set ME=1
|
|
*
|
|
* We use paca->in_mce to check whether this is the first entry or
|
|
* nested machine check. We increment paca->in_mce to track nested
|
|
* machine checks.
|
|
*
|
|
* If this is the first entry then set stack pointer to
|
|
* paca->mc_emergency_sp, otherwise r1 is already pointing to
|
|
* stack frame on mc_emergency stack.
|
|
*
|
|
* NOTE: We are here with MSR_ME=0 (off), which means we risk a
|
|
* checkstop if we get another machine check exception before we do
|
|
* rfid with MSR_ME=1.
|
|
*/
|
|
mr r11,r1 /* Save r1 */
|
|
lhz r10,PACA_IN_MCE(r13)
|
|
cmpwi r10,0 /* Are we in nested machine check */
|
|
bne 0f /* Yes, we are. */
|
|
/* First machine check entry */
|
|
ld r1,PACAMCEMERGSP(r13) /* Use MC emergency stack */
|
|
0: subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
|
|
addi r10,r10,1 /* increment paca->in_mce */
|
|
sth r10,PACA_IN_MCE(r13)
|
|
/* Limit nested MCE to level 4 to avoid stack overflow */
|
|
cmpwi r10,4
|
|
bgt 2f /* Check if we hit limit of 4 */
|
|
std r11,GPR1(r1) /* Save r1 on the stack. */
|
|
std r11,0(r1) /* make stack chain pointer */
|
|
mfspr r11,SPRN_SRR0 /* Save SRR0 */
|
|
std r11,_NIP(r1)
|
|
mfspr r11,SPRN_SRR1 /* Save SRR1 */
|
|
std r11,_MSR(r1)
|
|
mfspr r11,SPRN_DAR /* Save DAR */
|
|
std r11,_DAR(r1)
|
|
mfspr r11,SPRN_DSISR /* Save DSISR */
|
|
std r11,_DSISR(r1)
|
|
std r9,_CCR(r1) /* Save CR in stackframe */
|
|
/* Save r9 through r13 from EXMC save area to stack frame. */
|
|
EXCEPTION_PROLOG_COMMON_2(PACA_EXMC)
|
|
mfmsr r11 /* get MSR value */
|
|
ori r11,r11,MSR_ME /* turn on ME bit */
|
|
ori r11,r11,MSR_RI /* turn on RI bit */
|
|
ld r12,PACAKBASE(r13) /* get high part of &label */
|
|
LOAD_HANDLER(r12, machine_check_handle_early)
|
|
1: mtspr SPRN_SRR0,r12
|
|
mtspr SPRN_SRR1,r11
|
|
rfid
|
|
b . /* prevent speculative execution */
|
|
2:
|
|
/* Stack overflow. Stay on emergency stack and panic.
|
|
* Keep the ME bit off while panic-ing, so that if we hit
|
|
* another machine check we checkstop.
|
|
*/
|
|
addi r1,r1,INT_FRAME_SIZE /* go back to previous stack frame */
|
|
ld r11,PACAKMSR(r13)
|
|
ld r12,PACAKBASE(r13)
|
|
LOAD_HANDLER(r12, unrecover_mce)
|
|
li r10,MSR_ME
|
|
andc r11,r11,r10 /* Turn off MSR_ME */
|
|
b 1b
|
|
b . /* prevent speculative execution */
|
|
END_FTR_SECTION_IFSET(CPU_FTR_HVMODE)
|
|
|
|
machine_check_pSeries:
|
|
.globl machine_check_fwnmi
|
|
machine_check_fwnmi:
|
|
SET_SCRATCH0(r13) /* save r13 */
|
|
EXCEPTION_PROLOG_0(PACA_EXMC)
|
|
machine_check_pSeries_0:
|
|
EXCEPTION_PROLOG_1(PACA_EXMC, KVMTEST, 0x200)
|
|
EXCEPTION_PROLOG_PSERIES_1(machine_check_common, EXC_STD)
|
|
KVM_HANDLER_SKIP(PACA_EXMC, EXC_STD, 0x200)
|
|
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_STD, 0x300)
|
|
KVM_HANDLER_SKIP(PACA_EXSLB, EXC_STD, 0x380)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x400)
|
|
KVM_HANDLER(PACA_EXSLB, EXC_STD, 0x480)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0x900)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0x982)
|
|
|
|
#ifdef CONFIG_PPC_DENORMALISATION
|
|
denorm_assist:
|
|
BEGIN_FTR_SECTION
|
|
/*
|
|
* To denormalise we need to move a copy of the register to itself.
|
|
* For POWER6 do that here for all FP regs.
|
|
*/
|
|
mfmsr r10
|
|
ori r10,r10,(MSR_FP|MSR_FE0|MSR_FE1)
|
|
xori r10,r10,(MSR_FE0|MSR_FE1)
|
|
mtmsrd r10
|
|
sync
|
|
|
|
#define FMR2(n) fmr (n), (n) ; fmr n+1, n+1
|
|
#define FMR4(n) FMR2(n) ; FMR2(n+2)
|
|
#define FMR8(n) FMR4(n) ; FMR4(n+4)
|
|
#define FMR16(n) FMR8(n) ; FMR8(n+8)
|
|
#define FMR32(n) FMR16(n) ; FMR16(n+16)
|
|
FMR32(0)
|
|
|
|
FTR_SECTION_ELSE
|
|
/*
|
|
* To denormalise we need to move a copy of the register to itself.
|
|
* For POWER7 do that here for the first 32 VSX registers only.
|
|
*/
|
|
mfmsr r10
|
|
oris r10,r10,MSR_VSX@h
|
|
mtmsrd r10
|
|
sync
|
|
|
|
#define XVCPSGNDP2(n) XVCPSGNDP(n,n,n) ; XVCPSGNDP(n+1,n+1,n+1)
|
|
#define XVCPSGNDP4(n) XVCPSGNDP2(n) ; XVCPSGNDP2(n+2)
|
|
#define XVCPSGNDP8(n) XVCPSGNDP4(n) ; XVCPSGNDP4(n+4)
|
|
#define XVCPSGNDP16(n) XVCPSGNDP8(n) ; XVCPSGNDP8(n+8)
|
|
#define XVCPSGNDP32(n) XVCPSGNDP16(n) ; XVCPSGNDP16(n+16)
|
|
XVCPSGNDP32(0)
|
|
|
|
ALT_FTR_SECTION_END_IFCLR(CPU_FTR_ARCH_206)
|
|
|
|
BEGIN_FTR_SECTION
|
|
b denorm_done
|
|
END_FTR_SECTION_IFCLR(CPU_FTR_ARCH_207S)
|
|
/*
|
|
* To denormalise we need to move a copy of the register to itself.
|
|
* For POWER8 we need to do that for all 64 VSX registers
|
|
*/
|
|
XVCPSGNDP32(32)
|
|
denorm_done:
|
|
mtspr SPRN_HSRR0,r11
|
|
mtcrf 0x80,r9
|
|
ld r9,PACA_EXGEN+EX_R9(r13)
|
|
RESTORE_PPR_PACA(PACA_EXGEN, r10)
|
|
BEGIN_FTR_SECTION
|
|
ld r10,PACA_EXGEN+EX_CFAR(r13)
|
|
mtspr SPRN_CFAR,r10
|
|
END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
|
|
ld r10,PACA_EXGEN+EX_R10(r13)
|
|
ld r11,PACA_EXGEN+EX_R11(r13)
|
|
ld r12,PACA_EXGEN+EX_R12(r13)
|
|
ld r13,PACA_EXGEN+EX_R13(r13)
|
|
HRFID
|
|
b .
|
|
#endif
|
|
|
|
.align 7
|
|
/* moved from 0xe00 */
|
|
STD_EXCEPTION_HV_OOL(0xe02, h_data_storage)
|
|
KVM_HANDLER_SKIP(PACA_EXGEN, EXC_HV, 0xe02)
|
|
STD_EXCEPTION_HV_OOL(0xe22, h_instr_storage)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe22)
|
|
STD_EXCEPTION_HV_OOL(0xe42, emulation_assist)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe42)
|
|
MASKABLE_EXCEPTION_HV_OOL(0xe62, hmi_exception)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe62)
|
|
|
|
MASKABLE_EXCEPTION_HV_OOL(0xe82, h_doorbell)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xe82)
|
|
|
|
MASKABLE_EXCEPTION_HV_OOL(0xea2, h_virt_irq)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xea2)
|
|
|
|
/* moved from 0xf00 */
|
|
STD_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf00)
|
|
STD_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf20)
|
|
STD_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf40)
|
|
STD_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_STD, 0xf60)
|
|
STD_EXCEPTION_HV_OOL(0xf82, facility_unavailable)
|
|
KVM_HANDLER(PACA_EXGEN, EXC_HV, 0xf82)
|
|
|
|
/*
|
|
* An interrupt came in while soft-disabled. We set paca->irq_happened, then:
|
|
* - If it was a decrementer interrupt, we bump the dec to max and and return.
|
|
* - If it was a doorbell we return immediately since doorbells are edge
|
|
* triggered and won't automatically refire.
|
|
* - If it was a HMI we return immediately since we handled it in realmode
|
|
* and it won't refire.
|
|
* - else we hard disable and return.
|
|
* This is called with r10 containing the value to OR to the paca field.
|
|
*/
|
|
#define MASKED_INTERRUPT(_H) \
|
|
masked_##_H##interrupt: \
|
|
std r11,PACA_EXGEN+EX_R11(r13); \
|
|
lbz r11,PACAIRQHAPPENED(r13); \
|
|
or r11,r11,r10; \
|
|
stb r11,PACAIRQHAPPENED(r13); \
|
|
cmpwi r10,PACA_IRQ_DEC; \
|
|
bne 1f; \
|
|
lis r10,0x7fff; \
|
|
ori r10,r10,0xffff; \
|
|
mtspr SPRN_DEC,r10; \
|
|
b 2f; \
|
|
1: cmpwi r10,PACA_IRQ_DBELL; \
|
|
beq 2f; \
|
|
cmpwi r10,PACA_IRQ_HMI; \
|
|
beq 2f; \
|
|
mfspr r10,SPRN_##_H##SRR1; \
|
|
rldicl r10,r10,48,1; /* clear MSR_EE */ \
|
|
rotldi r10,r10,16; \
|
|
mtspr SPRN_##_H##SRR1,r10; \
|
|
2: mtcrf 0x80,r9; \
|
|
ld r9,PACA_EXGEN+EX_R9(r13); \
|
|
ld r10,PACA_EXGEN+EX_R10(r13); \
|
|
ld r11,PACA_EXGEN+EX_R11(r13); \
|
|
GET_SCRATCH0(r13); \
|
|
##_H##rfid; \
|
|
b .
|
|
|
|
MASKED_INTERRUPT()
|
|
MASKED_INTERRUPT(H)
|
|
|
|
/*
|
|
* Called from arch_local_irq_enable when an interrupt needs
|
|
* to be resent. r3 contains 0x500, 0x900, 0xa00 or 0xe80 to indicate
|
|
* which kind of interrupt. MSR:EE is already off. We generate a
|
|
* stackframe like if a real interrupt had happened.
|
|
*
|
|
* Note: While MSR:EE is off, we need to make sure that _MSR
|
|
* in the generated frame has EE set to 1 or the exception
|
|
* handler will not properly re-enable them.
|
|
*/
|
|
_GLOBAL(__replay_interrupt)
|
|
/* We are going to jump to the exception common code which
|
|
* will retrieve various register values from the PACA which
|
|
* we don't give a damn about, so we don't bother storing them.
|
|
*/
|
|
mfmsr r12
|
|
mflr r11
|
|
mfcr r9
|
|
ori r12,r12,MSR_EE
|
|
cmpwi r3,0x900
|
|
beq decrementer_common
|
|
cmpwi r3,0x500
|
|
beq hardware_interrupt_common
|
|
BEGIN_FTR_SECTION
|
|
cmpwi r3,0xe80
|
|
beq h_doorbell_common
|
|
cmpwi r3,0xea0
|
|
beq h_virt_irq_common
|
|
cmpwi r3,0xe60
|
|
beq hmi_exception_common
|
|
FTR_SECTION_ELSE
|
|
cmpwi r3,0xa00
|
|
beq doorbell_super_common
|
|
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
|
|
blr
|
|
|
|
#ifdef CONFIG_PPC_PSERIES
|
|
/*
|
|
* Vectors for the FWNMI option. Share common code.
|
|
*/
|
|
.globl system_reset_fwnmi
|
|
.align 7
|
|
system_reset_fwnmi:
|
|
SET_SCRATCH0(r13) /* save r13 */
|
|
EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD,
|
|
NOTEST, 0x100)
|
|
|
|
#endif /* CONFIG_PPC_PSERIES */
|
|
|
|
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
|
|
kvmppc_skip_interrupt:
|
|
/*
|
|
* Here all GPRs are unchanged from when the interrupt happened
|
|
* except for r13, which is saved in SPRG_SCRATCH0.
|
|
*/
|
|
mfspr r13, SPRN_SRR0
|
|
addi r13, r13, 4
|
|
mtspr SPRN_SRR0, r13
|
|
GET_SCRATCH0(r13)
|
|
rfid
|
|
b .
|
|
|
|
kvmppc_skip_Hinterrupt:
|
|
/*
|
|
* Here all GPRs are unchanged from when the interrupt happened
|
|
* except for r13, which is saved in SPRG_SCRATCH0.
|
|
*/
|
|
mfspr r13, SPRN_HSRR0
|
|
addi r13, r13, 4
|
|
mtspr SPRN_HSRR0, r13
|
|
GET_SCRATCH0(r13)
|
|
hrfid
|
|
b .
|
|
#endif
|
|
|
|
/*
|
|
* Ensure that any handlers that get invoked from the exception prologs
|
|
* above are below the first 64KB (0x10000) of the kernel image because
|
|
* the prologs assemble the addresses of these handlers using the
|
|
* LOAD_HANDLER macro, which uses an ori instruction.
|
|
*/
|
|
|
|
/*** Common interrupt handlers ***/
|
|
|
|
STD_EXCEPTION_COMMON(0x100, system_reset, system_reset_exception)
|
|
|
|
STD_EXCEPTION_COMMON_ASYNC(0x500, hardware_interrupt, do_IRQ)
|
|
STD_EXCEPTION_COMMON_ASYNC(0x900, decrementer, timer_interrupt)
|
|
STD_EXCEPTION_COMMON(0x980, hdecrementer, hdec_interrupt)
|
|
#ifdef CONFIG_PPC_DOORBELL
|
|
STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, doorbell_exception)
|
|
#else
|
|
STD_EXCEPTION_COMMON_ASYNC(0xa00, doorbell_super, unknown_exception)
|
|
#endif
|
|
STD_EXCEPTION_COMMON(0xb00, trap_0b, unknown_exception)
|
|
STD_EXCEPTION_COMMON(0xd00, single_step, single_step_exception)
|
|
STD_EXCEPTION_COMMON(0xe00, trap_0e, unknown_exception)
|
|
STD_EXCEPTION_COMMON(0xe40, emulation_assist, emulation_assist_interrupt)
|
|
STD_EXCEPTION_COMMON_ASYNC(0xe60, hmi_exception, handle_hmi_exception)
|
|
#ifdef CONFIG_PPC_DOORBELL
|
|
STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, doorbell_exception)
|
|
#else
|
|
STD_EXCEPTION_COMMON_ASYNC(0xe80, h_doorbell, unknown_exception)
|
|
#endif
|
|
STD_EXCEPTION_COMMON_ASYNC(0xea0, h_virt_irq, do_IRQ)
|
|
STD_EXCEPTION_COMMON_ASYNC(0xf00, performance_monitor, performance_monitor_exception)
|
|
STD_EXCEPTION_COMMON(0x1300, instruction_breakpoint, instruction_breakpoint_exception)
|
|
STD_EXCEPTION_COMMON(0x1502, denorm, unknown_exception)
|
|
#ifdef CONFIG_ALTIVEC
|
|
STD_EXCEPTION_COMMON(0x1700, altivec_assist, altivec_assist_exception)
|
|
#else
|
|
STD_EXCEPTION_COMMON(0x1700, altivec_assist, unknown_exception)
|
|
#endif
|
|
|
|
/*
|
|
* Relocation-on interrupts: A subset of the interrupts can be delivered
|
|
* with IR=1/DR=1, if AIL==2 and MSR.HV won't be changed by delivering
|
|
* it. Addresses are the same as the original interrupt addresses, but
|
|
* offset by 0xc000000000004000.
|
|
* It's impossible to receive interrupts below 0x300 via this mechanism.
|
|
* KVM: None of these traps are from the guest ; anything that escalated
|
|
* to HV=1 from HV=0 is delivered via real mode handlers.
|
|
*/
|
|
|
|
/*
|
|
* This uses the standard macro, since the original 0x300 vector
|
|
* only has extra guff for STAB-based processors -- which never
|
|
* come here.
|
|
*/
|
|
STD_RELON_EXCEPTION_PSERIES(0x4300, 0x300, data_access)
|
|
. = 0x4380
|
|
.globl data_access_slb_relon_pSeries
|
|
data_access_slb_relon_pSeries:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXSLB)
|
|
EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x380)
|
|
std r3,PACA_EXSLB+EX_R3(r13)
|
|
mfspr r3,SPRN_DAR
|
|
mfspr r12,SPRN_SRR1
|
|
#ifndef CONFIG_RELOCATABLE
|
|
b slb_miss_realmode
|
|
#else
|
|
/*
|
|
* We can't just use a direct branch to slb_miss_realmode
|
|
* because the distance from here to there depends on where
|
|
* the kernel ends up being put.
|
|
*/
|
|
mfctr r11
|
|
ld r10,PACAKBASE(r13)
|
|
LOAD_HANDLER(r10, slb_miss_realmode)
|
|
mtctr r10
|
|
bctr
|
|
#endif
|
|
|
|
STD_RELON_EXCEPTION_PSERIES(0x4400, 0x400, instruction_access)
|
|
. = 0x4480
|
|
.globl instruction_access_slb_relon_pSeries
|
|
instruction_access_slb_relon_pSeries:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXSLB)
|
|
EXCEPTION_PROLOG_1(PACA_EXSLB, NOTEST, 0x480)
|
|
std r3,PACA_EXSLB+EX_R3(r13)
|
|
mfspr r3,SPRN_SRR0 /* SRR0 is faulting address */
|
|
mfspr r12,SPRN_SRR1
|
|
#ifndef CONFIG_RELOCATABLE
|
|
b slb_miss_realmode
|
|
#else
|
|
mfctr r11
|
|
ld r10,PACAKBASE(r13)
|
|
LOAD_HANDLER(r10, slb_miss_realmode)
|
|
mtctr r10
|
|
bctr
|
|
#endif
|
|
|
|
. = 0x4500
|
|
.globl hardware_interrupt_relon_pSeries;
|
|
.globl hardware_interrupt_relon_hv;
|
|
hardware_interrupt_relon_pSeries:
|
|
hardware_interrupt_relon_hv:
|
|
BEGIN_FTR_SECTION
|
|
_MASKABLE_RELON_EXCEPTION_PSERIES(0x502, hardware_interrupt, EXC_HV, SOFTEN_TEST_HV)
|
|
FTR_SECTION_ELSE
|
|
_MASKABLE_RELON_EXCEPTION_PSERIES(0x500, hardware_interrupt, EXC_STD, SOFTEN_TEST_PR)
|
|
ALT_FTR_SECTION_END_IFSET(CPU_FTR_HVMODE)
|
|
STD_RELON_EXCEPTION_PSERIES(0x4600, 0x600, alignment)
|
|
STD_RELON_EXCEPTION_PSERIES(0x4700, 0x700, program_check)
|
|
STD_RELON_EXCEPTION_PSERIES(0x4800, 0x800, fp_unavailable)
|
|
MASKABLE_RELON_EXCEPTION_PSERIES(0x4900, 0x900, decrementer)
|
|
STD_RELON_EXCEPTION_HV(0x4980, 0x982, hdecrementer)
|
|
MASKABLE_RELON_EXCEPTION_PSERIES(0x4a00, 0xa00, doorbell_super)
|
|
STD_RELON_EXCEPTION_PSERIES(0x4b00, 0xb00, trap_0b)
|
|
|
|
. = 0x4c00
|
|
.globl system_call_relon_pSeries
|
|
system_call_relon_pSeries:
|
|
HMT_MEDIUM
|
|
SYSCALL_PSERIES_1
|
|
SYSCALL_PSERIES_2_DIRECT
|
|
SYSCALL_PSERIES_3
|
|
|
|
STD_RELON_EXCEPTION_PSERIES(0x4d00, 0xd00, single_step)
|
|
|
|
. = 0x4e00
|
|
b . /* Can't happen, see v2.07 Book III-S section 6.5 */
|
|
|
|
. = 0x4e20
|
|
b . /* Can't happen, see v2.07 Book III-S section 6.5 */
|
|
|
|
. = 0x4e40
|
|
emulation_assist_relon_trampoline:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXGEN)
|
|
b emulation_assist_relon_hv
|
|
|
|
. = 0x4e60
|
|
b . /* Can't happen, see v2.07 Book III-S section 6.5 */
|
|
|
|
. = 0x4e80
|
|
h_doorbell_relon_trampoline:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXGEN)
|
|
b h_doorbell_relon_hv
|
|
|
|
. = 0x4ea0
|
|
h_virt_irq_relon_trampoline:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXGEN)
|
|
b h_virt_irq_relon_hv
|
|
|
|
. = 0x4f00
|
|
performance_monitor_relon_pseries_trampoline:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXGEN)
|
|
b performance_monitor_relon_pSeries
|
|
|
|
. = 0x4f20
|
|
altivec_unavailable_relon_pseries_trampoline:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXGEN)
|
|
b altivec_unavailable_relon_pSeries
|
|
|
|
. = 0x4f40
|
|
vsx_unavailable_relon_pseries_trampoline:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXGEN)
|
|
b vsx_unavailable_relon_pSeries
|
|
|
|
. = 0x4f60
|
|
facility_unavailable_relon_trampoline:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXGEN)
|
|
b facility_unavailable_relon_pSeries
|
|
|
|
. = 0x4f80
|
|
hv_facility_unavailable_relon_trampoline:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXGEN)
|
|
b hv_facility_unavailable_relon_hv
|
|
|
|
STD_RELON_EXCEPTION_PSERIES(0x5300, 0x1300, instruction_breakpoint)
|
|
#ifdef CONFIG_PPC_DENORMALISATION
|
|
. = 0x5500
|
|
b denorm_exception_hv
|
|
#endif
|
|
STD_RELON_EXCEPTION_PSERIES(0x5700, 0x1700, altivec_assist)
|
|
|
|
.align 7
|
|
system_call_entry:
|
|
b system_call_common
|
|
|
|
ppc64_runlatch_on_trampoline:
|
|
b __ppc64_runlatch_on
|
|
|
|
/*
|
|
* Here r13 points to the paca, r9 contains the saved CR,
|
|
* SRR0 and SRR1 are saved in r11 and r12,
|
|
* r9 - r13 are saved in paca->exgen.
|
|
*/
|
|
.align 7
|
|
.globl data_access_common
|
|
data_access_common:
|
|
mfspr r10,SPRN_DAR
|
|
std r10,PACA_EXGEN+EX_DAR(r13)
|
|
mfspr r10,SPRN_DSISR
|
|
stw r10,PACA_EXGEN+EX_DSISR(r13)
|
|
EXCEPTION_PROLOG_COMMON(0x300, PACA_EXGEN)
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
ld r12,_MSR(r1)
|
|
ld r3,PACA_EXGEN+EX_DAR(r13)
|
|
lwz r4,PACA_EXGEN+EX_DSISR(r13)
|
|
li r5,0x300
|
|
std r3,_DAR(r1)
|
|
std r4,_DSISR(r1)
|
|
BEGIN_MMU_FTR_SECTION
|
|
b do_hash_page /* Try to handle as hpte fault */
|
|
MMU_FTR_SECTION_ELSE
|
|
b handle_page_fault
|
|
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
|
|
|
|
.align 7
|
|
.globl h_data_storage_common
|
|
h_data_storage_common:
|
|
mfspr r10,SPRN_HDAR
|
|
std r10,PACA_EXGEN+EX_DAR(r13)
|
|
mfspr r10,SPRN_HDSISR
|
|
stw r10,PACA_EXGEN+EX_DSISR(r13)
|
|
EXCEPTION_PROLOG_COMMON(0xe00, PACA_EXGEN)
|
|
bl save_nvgprs
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl unknown_exception
|
|
b ret_from_except
|
|
|
|
.align 7
|
|
.globl instruction_access_common
|
|
instruction_access_common:
|
|
EXCEPTION_PROLOG_COMMON(0x400, PACA_EXGEN)
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
ld r12,_MSR(r1)
|
|
ld r3,_NIP(r1)
|
|
andis. r4,r12,0x5820
|
|
li r5,0x400
|
|
std r3,_DAR(r1)
|
|
std r4,_DSISR(r1)
|
|
BEGIN_MMU_FTR_SECTION
|
|
b do_hash_page /* Try to handle as hpte fault */
|
|
MMU_FTR_SECTION_ELSE
|
|
b handle_page_fault
|
|
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
|
|
|
|
STD_EXCEPTION_COMMON(0xe20, h_instr_storage, unknown_exception)
|
|
|
|
/*
|
|
* Machine check is different because we use a different
|
|
* save area: PACA_EXMC instead of PACA_EXGEN.
|
|
*/
|
|
.align 7
|
|
.globl machine_check_common
|
|
machine_check_common:
|
|
|
|
mfspr r10,SPRN_DAR
|
|
std r10,PACA_EXGEN+EX_DAR(r13)
|
|
mfspr r10,SPRN_DSISR
|
|
stw r10,PACA_EXGEN+EX_DSISR(r13)
|
|
EXCEPTION_PROLOG_COMMON(0x200, PACA_EXMC)
|
|
FINISH_NAP
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
ld r3,PACA_EXGEN+EX_DAR(r13)
|
|
lwz r4,PACA_EXGEN+EX_DSISR(r13)
|
|
std r3,_DAR(r1)
|
|
std r4,_DSISR(r1)
|
|
bl save_nvgprs
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl machine_check_exception
|
|
b ret_from_except
|
|
|
|
.align 7
|
|
.globl alignment_common
|
|
alignment_common:
|
|
mfspr r10,SPRN_DAR
|
|
std r10,PACA_EXGEN+EX_DAR(r13)
|
|
mfspr r10,SPRN_DSISR
|
|
stw r10,PACA_EXGEN+EX_DSISR(r13)
|
|
EXCEPTION_PROLOG_COMMON(0x600, PACA_EXGEN)
|
|
ld r3,PACA_EXGEN+EX_DAR(r13)
|
|
lwz r4,PACA_EXGEN+EX_DSISR(r13)
|
|
std r3,_DAR(r1)
|
|
std r4,_DSISR(r1)
|
|
bl save_nvgprs
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl alignment_exception
|
|
b ret_from_except
|
|
|
|
.align 7
|
|
.globl program_check_common
|
|
program_check_common:
|
|
EXCEPTION_PROLOG_COMMON(0x700, PACA_EXGEN)
|
|
bl save_nvgprs
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl program_check_exception
|
|
b ret_from_except
|
|
|
|
.align 7
|
|
.globl fp_unavailable_common
|
|
fp_unavailable_common:
|
|
EXCEPTION_PROLOG_COMMON(0x800, PACA_EXGEN)
|
|
bne 1f /* if from user, just load it up */
|
|
bl save_nvgprs
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl kernel_fp_unavailable_exception
|
|
BUG_OPCODE
|
|
1:
|
|
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
|
|
BEGIN_FTR_SECTION
|
|
/* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
|
|
* transaction), go do TM stuff
|
|
*/
|
|
rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
|
|
bne- 2f
|
|
END_FTR_SECTION_IFSET(CPU_FTR_TM)
|
|
#endif
|
|
bl load_up_fpu
|
|
b fast_exception_return
|
|
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
|
|
2: /* User process was in a transaction */
|
|
bl save_nvgprs
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl fp_unavailable_tm
|
|
b ret_from_except
|
|
#endif
|
|
.align 7
|
|
.globl altivec_unavailable_common
|
|
altivec_unavailable_common:
|
|
EXCEPTION_PROLOG_COMMON(0xf20, PACA_EXGEN)
|
|
#ifdef CONFIG_ALTIVEC
|
|
BEGIN_FTR_SECTION
|
|
beq 1f
|
|
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
|
|
BEGIN_FTR_SECTION_NESTED(69)
|
|
/* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
|
|
* transaction), go do TM stuff
|
|
*/
|
|
rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
|
|
bne- 2f
|
|
END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
|
|
#endif
|
|
bl load_up_altivec
|
|
b fast_exception_return
|
|
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
|
|
2: /* User process was in a transaction */
|
|
bl save_nvgprs
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl altivec_unavailable_tm
|
|
b ret_from_except
|
|
#endif
|
|
1:
|
|
END_FTR_SECTION_IFSET(CPU_FTR_ALTIVEC)
|
|
#endif
|
|
bl save_nvgprs
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl altivec_unavailable_exception
|
|
b ret_from_except
|
|
|
|
.align 7
|
|
.globl vsx_unavailable_common
|
|
vsx_unavailable_common:
|
|
EXCEPTION_PROLOG_COMMON(0xf40, PACA_EXGEN)
|
|
#ifdef CONFIG_VSX
|
|
BEGIN_FTR_SECTION
|
|
beq 1f
|
|
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
|
|
BEGIN_FTR_SECTION_NESTED(69)
|
|
/* Test if 2 TM state bits are zero. If non-zero (ie. userspace was in
|
|
* transaction), go do TM stuff
|
|
*/
|
|
rldicl. r0, r12, (64-MSR_TS_LG), (64-2)
|
|
bne- 2f
|
|
END_FTR_SECTION_NESTED(CPU_FTR_TM, CPU_FTR_TM, 69)
|
|
#endif
|
|
b load_up_vsx
|
|
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
|
|
2: /* User process was in a transaction */
|
|
bl save_nvgprs
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl vsx_unavailable_tm
|
|
b ret_from_except
|
|
#endif
|
|
1:
|
|
END_FTR_SECTION_IFSET(CPU_FTR_VSX)
|
|
#endif
|
|
bl save_nvgprs
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl vsx_unavailable_exception
|
|
b ret_from_except
|
|
|
|
/* Equivalents to the above handlers for relocation-on interrupt vectors */
|
|
STD_RELON_EXCEPTION_HV_OOL(0xe40, emulation_assist)
|
|
MASKABLE_RELON_EXCEPTION_HV_OOL(0xe80, h_doorbell)
|
|
MASKABLE_RELON_EXCEPTION_HV_OOL(0xea0, h_virt_irq)
|
|
|
|
STD_RELON_EXCEPTION_PSERIES_OOL(0xf00, performance_monitor)
|
|
STD_RELON_EXCEPTION_PSERIES_OOL(0xf20, altivec_unavailable)
|
|
STD_RELON_EXCEPTION_PSERIES_OOL(0xf40, vsx_unavailable)
|
|
STD_RELON_EXCEPTION_PSERIES_OOL(0xf60, facility_unavailable)
|
|
STD_RELON_EXCEPTION_HV_OOL(0xf80, hv_facility_unavailable)
|
|
|
|
/*
|
|
* The __end_interrupts marker must be past the out-of-line (OOL)
|
|
* handlers, so that they are copied to real address 0x100 when running
|
|
* a relocatable kernel. This ensures they can be reached from the short
|
|
* trampoline handlers (like 0x4f00, 0x4f20, etc.) which branch
|
|
* directly, without using LOAD_HANDLER().
|
|
*/
|
|
.align 7
|
|
.globl __end_interrupts
|
|
__end_interrupts:
|
|
|
|
#if defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV)
|
|
/*
|
|
* Data area reserved for FWNMI option.
|
|
* This address (0x7000) is fixed by the RPA.
|
|
*/
|
|
.= 0x7000
|
|
.globl fwnmi_data_area
|
|
fwnmi_data_area:
|
|
|
|
/* pseries and powernv need to keep the whole page from
|
|
* 0x7000 to 0x8000 free for use by the firmware
|
|
*/
|
|
. = 0x8000
|
|
#endif /* defined(CONFIG_PPC_PSERIES) || defined(CONFIG_PPC_POWERNV) */
|
|
|
|
STD_EXCEPTION_COMMON(0xf60, facility_unavailable, facility_unavailable_exception)
|
|
STD_EXCEPTION_COMMON(0xf80, hv_facility_unavailable, facility_unavailable_exception)
|
|
|
|
#ifdef CONFIG_CBE_RAS
|
|
STD_EXCEPTION_COMMON(0x1200, cbe_system_error, cbe_system_error_exception)
|
|
STD_EXCEPTION_COMMON(0x1600, cbe_maintenance, cbe_maintenance_exception)
|
|
STD_EXCEPTION_COMMON(0x1800, cbe_thermal, cbe_thermal_exception)
|
|
#endif /* CONFIG_CBE_RAS */
|
|
|
|
.globl hmi_exception_early
|
|
hmi_exception_early:
|
|
EXCEPTION_PROLOG_1(PACA_EXGEN, KVMTEST, 0xe62)
|
|
mr r10,r1 /* Save r1 */
|
|
ld r1,PACAEMERGSP(r13) /* Use emergency stack */
|
|
subi r1,r1,INT_FRAME_SIZE /* alloc stack frame */
|
|
std r9,_CCR(r1) /* save CR in stackframe */
|
|
mfspr r11,SPRN_HSRR0 /* Save HSRR0 */
|
|
std r11,_NIP(r1) /* save HSRR0 in stackframe */
|
|
mfspr r12,SPRN_HSRR1 /* Save SRR1 */
|
|
std r12,_MSR(r1) /* save SRR1 in stackframe */
|
|
std r10,0(r1) /* make stack chain pointer */
|
|
std r0,GPR0(r1) /* save r0 in stackframe */
|
|
std r10,GPR1(r1) /* save r1 in stackframe */
|
|
EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
|
|
EXCEPTION_PROLOG_COMMON_3(0xe60)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl hmi_exception_realmode
|
|
/* Windup the stack. */
|
|
/* Move original HSRR0 and HSRR1 into the respective regs */
|
|
ld r9,_MSR(r1)
|
|
mtspr SPRN_HSRR1,r9
|
|
ld r3,_NIP(r1)
|
|
mtspr SPRN_HSRR0,r3
|
|
ld r9,_CTR(r1)
|
|
mtctr r9
|
|
ld r9,_XER(r1)
|
|
mtxer r9
|
|
ld r9,_LINK(r1)
|
|
mtlr r9
|
|
REST_GPR(0, r1)
|
|
REST_8GPRS(2, r1)
|
|
REST_GPR(10, r1)
|
|
ld r11,_CCR(r1)
|
|
mtcr r11
|
|
REST_GPR(11, r1)
|
|
REST_2GPRS(12, r1)
|
|
/* restore original r1. */
|
|
ld r1,GPR1(r1)
|
|
|
|
/*
|
|
* Go to virtual mode and pull the HMI event information from
|
|
* firmware.
|
|
*/
|
|
.globl hmi_exception_after_realmode
|
|
hmi_exception_after_realmode:
|
|
SET_SCRATCH0(r13)
|
|
EXCEPTION_PROLOG_0(PACA_EXGEN)
|
|
b hmi_exception_hv
|
|
|
|
|
|
#define MACHINE_CHECK_HANDLER_WINDUP \
|
|
/* Clear MSR_RI before setting SRR0 and SRR1. */\
|
|
li r0,MSR_RI; \
|
|
mfmsr r9; /* get MSR value */ \
|
|
andc r9,r9,r0; \
|
|
mtmsrd r9,1; /* Clear MSR_RI */ \
|
|
/* Move original SRR0 and SRR1 into the respective regs */ \
|
|
ld r9,_MSR(r1); \
|
|
mtspr SPRN_SRR1,r9; \
|
|
ld r3,_NIP(r1); \
|
|
mtspr SPRN_SRR0,r3; \
|
|
ld r9,_CTR(r1); \
|
|
mtctr r9; \
|
|
ld r9,_XER(r1); \
|
|
mtxer r9; \
|
|
ld r9,_LINK(r1); \
|
|
mtlr r9; \
|
|
REST_GPR(0, r1); \
|
|
REST_8GPRS(2, r1); \
|
|
REST_GPR(10, r1); \
|
|
ld r11,_CCR(r1); \
|
|
mtcr r11; \
|
|
/* Decrement paca->in_mce. */ \
|
|
lhz r12,PACA_IN_MCE(r13); \
|
|
subi r12,r12,1; \
|
|
sth r12,PACA_IN_MCE(r13); \
|
|
REST_GPR(11, r1); \
|
|
REST_2GPRS(12, r1); \
|
|
/* restore original r1. */ \
|
|
ld r1,GPR1(r1)
|
|
|
|
/*
|
|
* Handle machine check early in real mode. We come here with
|
|
* ME=1, MMU (IR=0 and DR=0) off and using MC emergency stack.
|
|
*/
|
|
.align 7
|
|
.globl machine_check_handle_early
|
|
machine_check_handle_early:
|
|
std r0,GPR0(r1) /* Save r0 */
|
|
EXCEPTION_PROLOG_COMMON_3(0x200)
|
|
bl save_nvgprs
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl machine_check_early
|
|
std r3,RESULT(r1) /* Save result */
|
|
ld r12,_MSR(r1)
|
|
#ifdef CONFIG_PPC_P7_NAP
|
|
/*
|
|
* Check if thread was in power saving mode. We come here when any
|
|
* of the following is true:
|
|
* a. thread wasn't in power saving mode
|
|
* b. thread was in power saving mode with no state loss or
|
|
* supervisor state loss
|
|
*
|
|
* Go back to nap again if (b) is true.
|
|
*/
|
|
rlwinm. r11,r12,47-31,30,31 /* Was it in power saving mode? */
|
|
beq 4f /* No, it wasn;t */
|
|
/* Thread was in power saving mode. Go back to nap again. */
|
|
cmpwi r11,2
|
|
bne 3f
|
|
/* Supervisor state loss */
|
|
li r0,1
|
|
stb r0,PACA_NAPSTATELOST(r13)
|
|
3: bl machine_check_queue_event
|
|
MACHINE_CHECK_HANDLER_WINDUP
|
|
GET_PACA(r13)
|
|
ld r1,PACAR1(r13)
|
|
li r3,PNV_THREAD_NAP
|
|
b pnv_enter_arch207_idle_mode
|
|
4:
|
|
#endif
|
|
/*
|
|
* Check if we are coming from hypervisor userspace. If yes then we
|
|
* continue in host kernel in V mode to deliver the MC event.
|
|
*/
|
|
rldicl. r11,r12,4,63 /* See if MC hit while in HV mode. */
|
|
beq 5f
|
|
andi. r11,r12,MSR_PR /* See if coming from user. */
|
|
bne 9f /* continue in V mode if we are. */
|
|
|
|
5:
|
|
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
|
|
/*
|
|
* We are coming from kernel context. Check if we are coming from
|
|
* guest. if yes, then we can continue. We will fall through
|
|
* do_kvm_200->kvmppc_interrupt to deliver the MC event to guest.
|
|
*/
|
|
lbz r11,HSTATE_IN_GUEST(r13)
|
|
cmpwi r11,0 /* Check if coming from guest */
|
|
bne 9f /* continue if we are. */
|
|
#endif
|
|
/*
|
|
* At this point we are not sure about what context we come from.
|
|
* Queue up the MCE event and return from the interrupt.
|
|
* But before that, check if this is an un-recoverable exception.
|
|
* If yes, then stay on emergency stack and panic.
|
|
*/
|
|
andi. r11,r12,MSR_RI
|
|
bne 2f
|
|
1: mfspr r11,SPRN_SRR0
|
|
ld r10,PACAKBASE(r13)
|
|
LOAD_HANDLER(r10,unrecover_mce)
|
|
mtspr SPRN_SRR0,r10
|
|
ld r10,PACAKMSR(r13)
|
|
/*
|
|
* We are going down. But there are chances that we might get hit by
|
|
* another MCE during panic path and we may run into unstable state
|
|
* with no way out. Hence, turn ME bit off while going down, so that
|
|
* when another MCE is hit during panic path, system will checkstop
|
|
* and hypervisor will get restarted cleanly by SP.
|
|
*/
|
|
li r3,MSR_ME
|
|
andc r10,r10,r3 /* Turn off MSR_ME */
|
|
mtspr SPRN_SRR1,r10
|
|
rfid
|
|
b .
|
|
2:
|
|
/*
|
|
* Check if we have successfully handled/recovered from error, if not
|
|
* then stay on emergency stack and panic.
|
|
*/
|
|
ld r3,RESULT(r1) /* Load result */
|
|
cmpdi r3,0 /* see if we handled MCE successfully */
|
|
|
|
beq 1b /* if !handled then panic */
|
|
/*
|
|
* Return from MC interrupt.
|
|
* Queue up the MCE event so that we can log it later, while
|
|
* returning from kernel or opal call.
|
|
*/
|
|
bl machine_check_queue_event
|
|
MACHINE_CHECK_HANDLER_WINDUP
|
|
rfid
|
|
9:
|
|
/* Deliver the machine check to host kernel in V mode. */
|
|
MACHINE_CHECK_HANDLER_WINDUP
|
|
b machine_check_pSeries
|
|
|
|
unrecover_mce:
|
|
/* Invoke machine_check_exception to print MCE event and panic. */
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl machine_check_exception
|
|
/*
|
|
* We will not reach here. Even if we did, there is no way out. Call
|
|
* unrecoverable_exception and die.
|
|
*/
|
|
1: addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl unrecoverable_exception
|
|
b 1b
|
|
/*
|
|
* r13 points to the PACA, r9 contains the saved CR,
|
|
* r12 contain the saved SRR1, SRR0 is still ready for return
|
|
* r3 has the faulting address
|
|
* r9 - r13 are saved in paca->exslb.
|
|
* r3 is saved in paca->slb_r3
|
|
* We assume we aren't going to take any exceptions during this procedure.
|
|
*/
|
|
slb_miss_realmode:
|
|
mflr r10
|
|
#ifdef CONFIG_RELOCATABLE
|
|
mtctr r11
|
|
#endif
|
|
|
|
stw r9,PACA_EXSLB+EX_CCR(r13) /* save CR in exc. frame */
|
|
std r10,PACA_EXSLB+EX_LR(r13) /* save LR */
|
|
|
|
#ifdef CONFIG_PPC_STD_MMU_64
|
|
BEGIN_MMU_FTR_SECTION
|
|
bl slb_allocate_realmode
|
|
END_MMU_FTR_SECTION_IFCLR(MMU_FTR_TYPE_RADIX)
|
|
#endif
|
|
/* All done -- return from exception. */
|
|
|
|
ld r10,PACA_EXSLB+EX_LR(r13)
|
|
ld r3,PACA_EXSLB+EX_R3(r13)
|
|
lwz r9,PACA_EXSLB+EX_CCR(r13) /* get saved CR */
|
|
|
|
mtlr r10
|
|
andi. r10,r12,MSR_RI /* check for unrecoverable exception */
|
|
BEGIN_MMU_FTR_SECTION
|
|
beq- 2f
|
|
FTR_SECTION_ELSE
|
|
b 2f
|
|
ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_TYPE_RADIX)
|
|
|
|
.machine push
|
|
.machine "power4"
|
|
mtcrf 0x80,r9
|
|
mtcrf 0x01,r9 /* slb_allocate uses cr0 and cr7 */
|
|
.machine pop
|
|
|
|
RESTORE_PPR_PACA(PACA_EXSLB, r9)
|
|
ld r9,PACA_EXSLB+EX_R9(r13)
|
|
ld r10,PACA_EXSLB+EX_R10(r13)
|
|
ld r11,PACA_EXSLB+EX_R11(r13)
|
|
ld r12,PACA_EXSLB+EX_R12(r13)
|
|
ld r13,PACA_EXSLB+EX_R13(r13)
|
|
rfid
|
|
b . /* prevent speculative execution */
|
|
|
|
2: mfspr r11,SPRN_SRR0
|
|
ld r10,PACAKBASE(r13)
|
|
LOAD_HANDLER(r10,unrecov_slb)
|
|
mtspr SPRN_SRR0,r10
|
|
ld r10,PACAKMSR(r13)
|
|
mtspr SPRN_SRR1,r10
|
|
rfid
|
|
b .
|
|
|
|
unrecov_slb:
|
|
EXCEPTION_PROLOG_COMMON(0x4100, PACA_EXSLB)
|
|
RECONCILE_IRQ_STATE(r10, r11)
|
|
bl save_nvgprs
|
|
1: addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl unrecoverable_exception
|
|
b 1b
|
|
|
|
|
|
#ifdef CONFIG_PPC_970_NAP
|
|
power4_fixup_nap:
|
|
andc r9,r9,r10
|
|
std r9,TI_LOCAL_FLAGS(r11)
|
|
ld r10,_LINK(r1) /* make idle task do the */
|
|
std r10,_NIP(r1) /* equivalent of a blr */
|
|
blr
|
|
#endif
|
|
|
|
/*
|
|
* Hash table stuff
|
|
*/
|
|
.align 7
|
|
do_hash_page:
|
|
#ifdef CONFIG_PPC_STD_MMU_64
|
|
andis. r0,r4,0xa410 /* weird error? */
|
|
bne- handle_page_fault /* if not, try to insert a HPTE */
|
|
andis. r0,r4,DSISR_DABRMATCH@h
|
|
bne- handle_dabr_fault
|
|
CURRENT_THREAD_INFO(r11, r1)
|
|
lwz r0,TI_PREEMPT(r11) /* If we're in an "NMI" */
|
|
andis. r0,r0,NMI_MASK@h /* (i.e. an irq when soft-disabled) */
|
|
bne 77f /* then don't call hash_page now */
|
|
|
|
/*
|
|
* r3 contains the faulting address
|
|
* r4 msr
|
|
* r5 contains the trap number
|
|
* r6 contains dsisr
|
|
*
|
|
* at return r3 = 0 for success, 1 for page fault, negative for error
|
|
*/
|
|
mr r4,r12
|
|
ld r6,_DSISR(r1)
|
|
bl __hash_page /* build HPTE if possible */
|
|
cmpdi r3,0 /* see if __hash_page succeeded */
|
|
|
|
/* Success */
|
|
beq fast_exc_return_irq /* Return from exception on success */
|
|
|
|
/* Error */
|
|
blt- 13f
|
|
#endif /* CONFIG_PPC_STD_MMU_64 */
|
|
|
|
/* Here we have a page fault that hash_page can't handle. */
|
|
handle_page_fault:
|
|
11: ld r4,_DAR(r1)
|
|
ld r5,_DSISR(r1)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl do_page_fault
|
|
cmpdi r3,0
|
|
beq+ 12f
|
|
bl save_nvgprs
|
|
mr r5,r3
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
lwz r4,_DAR(r1)
|
|
bl bad_page_fault
|
|
b ret_from_except
|
|
|
|
/* We have a data breakpoint exception - handle it */
|
|
handle_dabr_fault:
|
|
bl save_nvgprs
|
|
ld r4,_DAR(r1)
|
|
ld r5,_DSISR(r1)
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl do_break
|
|
12: b ret_from_except_lite
|
|
|
|
|
|
#ifdef CONFIG_PPC_STD_MMU_64
|
|
/* We have a page fault that hash_page could handle but HV refused
|
|
* the PTE insertion
|
|
*/
|
|
13: bl save_nvgprs
|
|
mr r5,r3
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
ld r4,_DAR(r1)
|
|
bl low_hash_fault
|
|
b ret_from_except
|
|
#endif
|
|
|
|
/*
|
|
* We come here as a result of a DSI at a point where we don't want
|
|
* to call hash_page, such as when we are accessing memory (possibly
|
|
* user memory) inside a PMU interrupt that occurred while interrupts
|
|
* were soft-disabled. We want to invoke the exception handler for
|
|
* the access, or panic if there isn't a handler.
|
|
*/
|
|
77: bl save_nvgprs
|
|
mr r4,r3
|
|
addi r3,r1,STACK_FRAME_OVERHEAD
|
|
li r5,SIGSEGV
|
|
bl bad_page_fault
|
|
b ret_from_except
|
|
|
|
/*
|
|
* Here we have detected that the kernel stack pointer is bad.
|
|
* R9 contains the saved CR, r13 points to the paca,
|
|
* r10 contains the (bad) kernel stack pointer,
|
|
* r11 and r12 contain the saved SRR0 and SRR1.
|
|
* We switch to using an emergency stack, save the registers there,
|
|
* and call kernel_bad_stack(), which panics.
|
|
*/
|
|
bad_stack:
|
|
ld r1,PACAEMERGSP(r13)
|
|
subi r1,r1,64+INT_FRAME_SIZE
|
|
std r9,_CCR(r1)
|
|
std r10,GPR1(r1)
|
|
std r11,_NIP(r1)
|
|
std r12,_MSR(r1)
|
|
mfspr r11,SPRN_DAR
|
|
mfspr r12,SPRN_DSISR
|
|
std r11,_DAR(r1)
|
|
std r12,_DSISR(r1)
|
|
mflr r10
|
|
mfctr r11
|
|
mfxer r12
|
|
std r10,_LINK(r1)
|
|
std r11,_CTR(r1)
|
|
std r12,_XER(r1)
|
|
SAVE_GPR(0,r1)
|
|
SAVE_GPR(2,r1)
|
|
ld r10,EX_R3(r3)
|
|
std r10,GPR3(r1)
|
|
SAVE_GPR(4,r1)
|
|
SAVE_4GPRS(5,r1)
|
|
ld r9,EX_R9(r3)
|
|
ld r10,EX_R10(r3)
|
|
SAVE_2GPRS(9,r1)
|
|
ld r9,EX_R11(r3)
|
|
ld r10,EX_R12(r3)
|
|
ld r11,EX_R13(r3)
|
|
std r9,GPR11(r1)
|
|
std r10,GPR12(r1)
|
|
std r11,GPR13(r1)
|
|
BEGIN_FTR_SECTION
|
|
ld r10,EX_CFAR(r3)
|
|
std r10,ORIG_GPR3(r1)
|
|
END_FTR_SECTION_IFSET(CPU_FTR_CFAR)
|
|
SAVE_8GPRS(14,r1)
|
|
SAVE_10GPRS(22,r1)
|
|
lhz r12,PACA_TRAP_SAVE(r13)
|
|
std r12,_TRAP(r1)
|
|
addi r11,r1,INT_FRAME_SIZE
|
|
std r11,0(r1)
|
|
li r12,0
|
|
std r12,0(r11)
|
|
ld r2,PACATOC(r13)
|
|
ld r11,exception_marker@toc(r2)
|
|
std r12,RESULT(r1)
|
|
std r11,STACK_FRAME_OVERHEAD-16(r1)
|
|
1: addi r3,r1,STACK_FRAME_OVERHEAD
|
|
bl kernel_bad_stack
|
|
b 1b
|