forked from Minki/linux
49fa523046
The system call tracing bug fix mentioned in the Fixes tag
below increased the amount of assembler code in the sequence
of assembler files included by head_64.S
This caused to total set of code to exceed 0x4000 bytes in
size, which overflows the expression in head_64.S that works
to place swapper_tsb at address 0x408000.
When this is violated, the TSB is not properly aligned, and
also the trap table is not aligned properly either. All of
this together results in failed boots.
So, do two things:
1) Simplify some code by using ba,a instead of ba/nop to get
those bytes back.
2) Add a linker script assertion to make sure that if this
happens again the build will fail.
Fixes: 1a40b95374 ("sparc: Fix system call tracing register handling.")
Reported-by: Meelis Roos <mroos@linux.ee>
Reported-by: Joerg Abraham <joerg.abraham@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
240 lines
7.0 KiB
ArmAsm
240 lines
7.0 KiB
ArmAsm
/* We need to carefully read the error status, ACK the errors,
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* prevent recursive traps, and pass the information on to C
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* code for logging.
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*
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* We pass the AFAR in as-is, and we encode the status
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* information as described in asm-sparc64/sfafsr.h
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*/
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.type __spitfire_access_error,#function
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__spitfire_access_error:
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/* Disable ESTATE error reporting so that we do not take
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* recursive traps and RED state the processor.
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*/
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stxa %g0, [%g0] ASI_ESTATE_ERROR_EN
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membar #Sync
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mov UDBE_UE, %g1
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ldxa [%g0] ASI_AFSR, %g4 ! Get AFSR
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/* __spitfire_cee_trap branches here with AFSR in %g4 and
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* UDBE_CE in %g1. It only clears ESTATE_ERR_CE in the ESTATE
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* Error Enable register.
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*/
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__spitfire_cee_trap_continue:
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ldxa [%g0] ASI_AFAR, %g5 ! Get AFAR
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rdpr %tt, %g3
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and %g3, 0x1ff, %g3 ! Paranoia
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sllx %g3, SFSTAT_TRAP_TYPE_SHIFT, %g3
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or %g4, %g3, %g4
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rdpr %tl, %g3
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cmp %g3, 1
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mov 1, %g3
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bleu %xcc, 1f
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sllx %g3, SFSTAT_TL_GT_ONE_SHIFT, %g3
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or %g4, %g3, %g4
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/* Read in the UDB error register state, clearing the sticky
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* error bits as-needed. We only clear them if the UE bit is
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* set. Likewise, __spitfire_cee_trap below will only do so
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* if the CE bit is set.
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*
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* NOTE: UltraSparc-I/II have high and low UDB error
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* registers, corresponding to the two UDB units
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* present on those chips. UltraSparc-IIi only
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* has a single UDB, called "SDB" in the manual.
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* For IIi the upper UDB register always reads
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* as zero so for our purposes things will just
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* work with the checks below.
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*/
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1: ldxa [%g0] ASI_UDBH_ERROR_R, %g3
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and %g3, 0x3ff, %g7 ! Paranoia
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sllx %g7, SFSTAT_UDBH_SHIFT, %g7
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or %g4, %g7, %g4
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andcc %g3, %g1, %g3 ! UDBE_UE or UDBE_CE
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be,pn %xcc, 1f
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nop
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stxa %g3, [%g0] ASI_UDB_ERROR_W
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membar #Sync
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1: mov 0x18, %g3
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ldxa [%g3] ASI_UDBL_ERROR_R, %g3
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and %g3, 0x3ff, %g7 ! Paranoia
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sllx %g7, SFSTAT_UDBL_SHIFT, %g7
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or %g4, %g7, %g4
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andcc %g3, %g1, %g3 ! UDBE_UE or UDBE_CE
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be,pn %xcc, 1f
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nop
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mov 0x18, %g7
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stxa %g3, [%g7] ASI_UDB_ERROR_W
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membar #Sync
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1: /* Ok, now that we've latched the error state, clear the
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* sticky bits in the AFSR.
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*/
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stxa %g4, [%g0] ASI_AFSR
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membar #Sync
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rdpr %tl, %g2
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cmp %g2, 1
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rdpr %pil, %g2
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bleu,pt %xcc, 1f
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wrpr %g0, PIL_NORMAL_MAX, %pil
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ba,pt %xcc, etraptl1
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rd %pc, %g7
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ba,a,pt %xcc, 2f
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1: ba,pt %xcc, etrap_irq
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rd %pc, %g7
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2:
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#ifdef CONFIG_TRACE_IRQFLAGS
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call trace_hardirqs_off
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nop
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#endif
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mov %l4, %o1
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mov %l5, %o2
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call spitfire_access_error
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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.size __spitfire_access_error,.-__spitfire_access_error
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/* This is the trap handler entry point for ECC correctable
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* errors. They are corrected, but we listen for the trap so
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* that the event can be logged.
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*
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* Disrupting errors are either:
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* 1) single-bit ECC errors during UDB reads to system
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* memory
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* 2) data parity errors during write-back events
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*
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* As far as I can make out from the manual, the CEE trap is
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* only for correctable errors during memory read accesses by
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* the front-end of the processor.
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*
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* The code below is only for trap level 1 CEE events, as it
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* is the only situation where we can safely record and log.
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* For trap level >1 we just clear the CE bit in the AFSR and
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* return.
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*
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* This is just like __spiftire_access_error above, but it
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* specifically handles correctable errors. If an
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* uncorrectable error is indicated in the AFSR we will branch
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* directly above to __spitfire_access_error to handle it
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* instead. Uncorrectable therefore takes priority over
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* correctable, and the error logging C code will notice this
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* case by inspecting the trap type.
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*/
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.type __spitfire_cee_trap,#function
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__spitfire_cee_trap:
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ldxa [%g0] ASI_AFSR, %g4 ! Get AFSR
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mov 1, %g3
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sllx %g3, SFAFSR_UE_SHIFT, %g3
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andcc %g4, %g3, %g0 ! Check for UE
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bne,pn %xcc, __spitfire_access_error
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nop
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/* Ok, in this case we only have a correctable error.
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* Indicate we only wish to capture that state in register
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* %g1, and we only disable CE error reporting unlike UE
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* handling which disables all errors.
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*/
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ldxa [%g0] ASI_ESTATE_ERROR_EN, %g3
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andn %g3, ESTATE_ERR_CE, %g3
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stxa %g3, [%g0] ASI_ESTATE_ERROR_EN
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membar #Sync
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/* Preserve AFSR in %g4, indicate UDB state to capture in %g1 */
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ba,pt %xcc, __spitfire_cee_trap_continue
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mov UDBE_CE, %g1
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.size __spitfire_cee_trap,.-__spitfire_cee_trap
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.type __spitfire_data_access_exception_tl1,#function
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__spitfire_data_access_exception_tl1:
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rdpr %pstate, %g4
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wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
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mov TLB_SFSR, %g3
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mov DMMU_SFAR, %g5
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ldxa [%g3] ASI_DMMU, %g4 ! Get SFSR
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ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR
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stxa %g0, [%g3] ASI_DMMU ! Clear SFSR.FaultValid bit
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membar #Sync
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rdpr %tt, %g3
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cmp %g3, 0x80 ! first win spill/fill trap
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blu,pn %xcc, 1f
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cmp %g3, 0xff ! last win spill/fill trap
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bgu,pn %xcc, 1f
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nop
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ba,pt %xcc, winfix_dax
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rdpr %tpc, %g3
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1: sethi %hi(109f), %g7
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ba,pt %xcc, etraptl1
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109: or %g7, %lo(109b), %g7
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mov %l4, %o1
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mov %l5, %o2
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call spitfire_data_access_exception_tl1
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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.size __spitfire_data_access_exception_tl1,.-__spitfire_data_access_exception_tl1
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.type __spitfire_data_access_exception,#function
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__spitfire_data_access_exception:
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rdpr %pstate, %g4
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wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
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mov TLB_SFSR, %g3
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mov DMMU_SFAR, %g5
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ldxa [%g3] ASI_DMMU, %g4 ! Get SFSR
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ldxa [%g5] ASI_DMMU, %g5 ! Get SFAR
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stxa %g0, [%g3] ASI_DMMU ! Clear SFSR.FaultValid bit
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membar #Sync
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sethi %hi(109f), %g7
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ba,pt %xcc, etrap
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109: or %g7, %lo(109b), %g7
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mov %l4, %o1
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mov %l5, %o2
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call spitfire_data_access_exception
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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.size __spitfire_data_access_exception,.-__spitfire_data_access_exception
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.type __spitfire_insn_access_exception_tl1,#function
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__spitfire_insn_access_exception_tl1:
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rdpr %pstate, %g4
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wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
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mov TLB_SFSR, %g3
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ldxa [%g3] ASI_IMMU, %g4 ! Get SFSR
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rdpr %tpc, %g5 ! IMMU has no SFAR, use TPC
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stxa %g0, [%g3] ASI_IMMU ! Clear FaultValid bit
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membar #Sync
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sethi %hi(109f), %g7
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ba,pt %xcc, etraptl1
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109: or %g7, %lo(109b), %g7
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mov %l4, %o1
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mov %l5, %o2
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call spitfire_insn_access_exception_tl1
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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.size __spitfire_insn_access_exception_tl1,.-__spitfire_insn_access_exception_tl1
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.type __spitfire_insn_access_exception,#function
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__spitfire_insn_access_exception:
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rdpr %pstate, %g4
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wrpr %g4, PSTATE_MG|PSTATE_AG, %pstate
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mov TLB_SFSR, %g3
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ldxa [%g3] ASI_IMMU, %g4 ! Get SFSR
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rdpr %tpc, %g5 ! IMMU has no SFAR, use TPC
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stxa %g0, [%g3] ASI_IMMU ! Clear FaultValid bit
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membar #Sync
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sethi %hi(109f), %g7
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ba,pt %xcc, etrap
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109: or %g7, %lo(109b), %g7
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mov %l4, %o1
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mov %l5, %o2
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call spitfire_insn_access_exception
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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.size __spitfire_insn_access_exception,.-__spitfire_insn_access_exception
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