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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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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>
94 lines
2.0 KiB
ArmAsm
94 lines
2.0 KiB
ArmAsm
#ifdef CONFIG_KGDB
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.globl arch_kgdb_breakpoint
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.type arch_kgdb_breakpoint,#function
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arch_kgdb_breakpoint:
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ta 0x72
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retl
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nop
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.size arch_kgdb_breakpoint,.-arch_kgdb_breakpoint
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#endif
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.type __do_privact,#function
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__do_privact:
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mov TLB_SFSR, %g3
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stxa %g0, [%g3] ASI_DMMU ! 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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call do_privact
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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.size __do_privact,.-__do_privact
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.type do_mna,#function
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do_mna:
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rdpr %tl, %g3
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cmp %g3, 1
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/* Setup %g4/%g5 now as they are used in the
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* winfixup code.
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*/
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mov TLB_SFSR, %g3
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mov DMMU_SFAR, %g4
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ldxa [%g4] ASI_DMMU, %g4
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ldxa [%g3] ASI_DMMU, %g5
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stxa %g0, [%g3] ASI_DMMU ! Clear FaultValid bit
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membar #Sync
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bgu,pn %icc, winfix_mna
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rdpr %tpc, %g3
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1: 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 mem_address_unaligned
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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.size do_mna,.-do_mna
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.type do_lddfmna,#function
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do_lddfmna:
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sethi %hi(109f), %g7
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mov TLB_SFSR, %g4
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ldxa [%g4] ASI_DMMU, %g5
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stxa %g0, [%g4] ASI_DMMU ! Clear FaultValid bit
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membar #Sync
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mov DMMU_SFAR, %g4
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ldxa [%g4] ASI_DMMU, %g4
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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 handle_lddfmna
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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.size do_lddfmna,.-do_lddfmna
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.type do_stdfmna,#function
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do_stdfmna:
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sethi %hi(109f), %g7
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mov TLB_SFSR, %g4
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ldxa [%g4] ASI_DMMU, %g5
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stxa %g0, [%g4] ASI_DMMU ! Clear FaultValid bit
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membar #Sync
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mov DMMU_SFAR, %g4
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ldxa [%g4] ASI_DMMU, %g4
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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 handle_stdfmna
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add %sp, PTREGS_OFF, %o0
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ba,a,pt %xcc, rtrap
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.size do_stdfmna,.-do_stdfmna
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.type breakpoint_trap,#function
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breakpoint_trap:
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call sparc_breakpoint
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add %sp, PTREGS_OFF, %o0
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ba,pt %xcc, rtrap
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nop
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.size breakpoint_trap,.-breakpoint_trap
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