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Avoid un-intended DCTI Couples. Use of DCTI couples is deprecated. Also address the "Programming Note" for optimal performance. Here is the complete text from Oracle SPARC Architecture Specs. 6.3.4.7 DCTI Couples "A delayed control transfer instruction (DCTI) in the delay slot of another DCTI is referred to as a “DCTI couple”. The use of DCTI couples is deprecated in the Oracle SPARC Architecture; no new software should place a DCTI in the delay slot of another DCTI, because on future Oracle SPARC Architecture implementations DCTI couples may execute either slowly or differently than the programmer assumes it will. SPARC V8 and SPARC V9 Compatibility Note The SPARC V8 architecture left behavior undefined for a DCTI couple. The SPARC V9 architecture defined behavior in that case, but as of UltraSPARC Architecture 2005, use of DCTI couples was deprecated. Software should not expect high performance from DCTI couples, and performance of DCTI couples should be expected to decline further in future processors. Programming Note As noted in TABLE 6-5 on page 115, an annulled branch-always (branch-always with a = 1) instruction is not architecturally a DCTI. However, since not all implementations make that distinction, for optimal performance, a DCTI should not be placed in the instruction word immediately following an annulled branch-always instruction (BA,A or BPA,A)." Signed-off-by: Babu Moger <babu.moger@oracle.com> Reviewed-by: Rob Gardner <rob.gardner@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
95 lines
2.0 KiB
ArmAsm
95 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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nop
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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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