Aren
/
NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

traceit: don't use %g7 as it is to become curcpu() register. Add comments.

This commit is contained in:
cdi 2003-07-08 22:09:26 +00:00
parent 6da321c1aa
commit 684b6d6499
1 changed files with 58 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

98
sys/arch/sparc64/sparc64/locore.s
View File

@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.177 2003/05/18 22:11:32 martin Exp $ */
/* $NetBSD: locore.s,v 1.178 2003/07/08 22:09:26 cdi Exp $ */
/*
* Copyright (c) 1996-2002 Eduardo Horvath
@ -1547,61 +1547,79 @@ _C_LABEL(trap_trace_end):
.text
traceit:
set trap_trace, %g2
lduw [%g2+TRACEDIS], %g4
brnz,pn %g4, 1f
lduw [%g2+TRACEPTR], %g3
set trap_trace, %g2 ! see db_interface.c
lduw [%g2+TRACEDIS], %g4 ! tracing disabled flag
brnz,pn %g4, 9f ! return if disabled
lduw [%g2+TRACEPTR], %g3 ! current offset into the trap_trace
rdpr %tl, %g4
rdpr %tt, %g5
set CURLWP, %g6
cmp %g4, 1
sllx %g4, 13, %g4
bnz,a,pt %icc, 3f
clr %g6
cmp %g5, 0x68
bnz,a,pt %icc, 3f
clr %g6
cmp %g5, 0x64
bnz,a,pt %icc, 3f
clr %g6
cmp %g5, 0x6c
bnz,a,pt %icc, 3f
clr %g6
LDPTR [%g6], %g6
3:
or %g4, %g5, %g4
mov %g0, %g5
brz,pn %g6, 2f
andncc %g3, (TRACESIZ-1), %g0 ! At end of buffer? wrap
LDPTR [%g6+P_PID], %g5 ! Load PID XXX that's not pid anymore
sllx %g4, 13, %g4 ! collect .tl bit-field in %g4
set CPCB, %g6 ! Load up nsaved
!! CURLWP is not pertinent for nested traps (TL > 1)
bne,a,pt %icc, 0f
clr %g6
!! CURLWP is not pertinent to fast MMU miss/prot traps
cmp %g5, T_FDMMU_MISS
bne,a,pt %icc, 0f
clr %g6
cmp %g5, T_FIMMU_MISS
bne,a,pt %icc, 0f
clr %g6
cmp %g5, T_FDMMU_PROT
bne,a,pt %icc, 0f
clr %g6
!! ok, CURLWP is pertinent, load it
LDPTR [%g6], %g6
0:
bset %g5, %g4 ! collect .tt bit-field in %g4
!! if curlwp is pertinent, find its pid
clr %g5
brz,pn %g6, 0f ! curlwp == NULL?
btst (TRACESIZ-1), %g3 ! reached the end of trap_trace[]?
LDPTR [%g6+P_PID], %g5 ! load pid. XXX: that's not pid anymore
!! load up nsaved
set CPCB, %g6
LDPTR [%g6], %g6
ldub [%g6 + PCB_NSAVED], %g6
sllx %g6, 9, %g6
or %g6, %g4, %g4
2:
bset %g6, %g4 ! collect .ns bit-field in %g4
0:
! btst (TRACESIZ-1), %g3
movnz %icc, %g0, %g3 ! may be wrap to the beginning of trap_trace[]
!! %g2 - trap_trace
!! %g3 - trap_trace_ptr (offset from trap_trace)
!! %g4 - collected .tl, .ns and .tt bit-fields
!! %g5 - pid
movnz %icc, %g0, %g3 ! Wrap buffer if needed
rdpr %tstate, %g6
rdpr %tpc, %g7
sth %g4, [%g2+%g3]
sth %g4, [%g2+%g3] ! traptrace.tl, .ns and .tt bit-fields
rdpr %tpc, %g4 ! %g4 is now free, can reuse
inc 2, %g3
sth %g5, [%g2+%g3]
sth %g5, [%g2+%g3] ! traptrace.pid
mov TLB_TAG_ACCESS, %g5 ! %g5 is now free, can reuse
inc 2, %g3
stw %g6, [%g2+%g3]
stw %g6, [%g2+%g3] ! traptrace.tstate
ldxa [%g5] ASI_DMMU, %g5
inc 4, %g3
stw %sp, [%g2+%g3]
stw %sp, [%g2+%g3] ! traptrace.tsp
inc 4, %g3
stw %g7, [%g2+%g3]
stw %g4, [%g2+%g3] ! traptrace.tpc
inc 4, %g3
mov TLB_TAG_ACCESS, %g7
ldxa [%g7] ASI_DMMU, %g7
stw %g7, [%g2+%g3]
stw %g5, [%g2+%g3] ! traptrace.tfault
inc 4, %g3
1:
jmpl %g1, %g0
stw %g3, [%g2+TRACEPTR]
9:
jmp %g1 ! return to processing the trap
stw %g3, [%g2+TRACEPTR] ! update trap_trace_ptr
traceitwin:
set trap_trace, %l2
lduw [%l2+TRACEDIS], %l4