[src/trunk]: src/sys/arch/sparc64/sparc64 Fix stack issues in bzero.

[eeh <eeh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/aec692e1f603
branches:  trunk
changeset: 495204:aec692e1f603
user:      eeh <eeh%NetBSD.org@localhost>
date:      Mon Jul 24 07:40:40 2000 +0000

description:
Fix stack issues in bzero.

diffstat:

 sys/arch/sparc64/sparc64/locore.s |  58 +++++++++++++++++++++++++++++++-------
 1 files changed, 47 insertions(+), 11 deletions(-)

diffs (119 lines):

diff -r 2df98ea54098 -r aec692e1f603 sys/arch/sparc64/sparc64/locore.s
--- a/sys/arch/sparc64/sparc64/locore.s Mon Jul 24 07:30:54 2000 +0000
+++ b/sys/arch/sparc64/sparc64/locore.s Mon Jul 24 07:40:40 2000 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.s,v 1.84 2000/07/24 06:30:34 mycroft Exp $      */
+/*     $NetBSD: locore.s,v 1.85 2000/07/24 07:40:40 eeh Exp $  */
 /*
  * Copyright (c) 1996-1999 Eduardo Horvath
  * Copyright (c) 1996 Paul Kranenburg
@@ -4384,7 +4384,7 @@
        tst     %o2
        tnz     %icc, 1; nop
 1:
-       set     EINTSTACK, %o2
+       set     EINTSTACK-STKB, %o2
        cmp     %sp, %o2
        bleu    0f
 
@@ -7418,7 +7418,43 @@
        ld      [%g2 + %lo(_C_LABEL(sched_whichqs))], %o3
        brnz,a,pt       %o3, Lsw_scan
         wrpr   %g0, PIL_CLOCK, %pil    ! (void) splclock();
-       ba,a,pt %icc, 1b
+       
+       ! Check uvm.page_idle_zero
+       sethi   %hi(_C_LABEL(uvm) + UVM_PAGE_IDLE_ZERO), %o3
+       ld      [%o3 + %lo(_C_LABEL(uvm) + UVM_PAGE_IDLE_ZERO)], %o3
+       brz,pn  %o3, 1b
+        nop
+#if 1          /* Don't enable the zeroing code just yet. */
+       ba,a,pt %icc, 1b
+       nop
+#endif
+       /*
+        * We must preserve several global registers across the call
+        * to uvm_pageidlezero().  Use the %ix registers for this, but
+        * since we might still be running in our our caller's frame
+        * (if we came here from cpu_switch()), we need to setup a
+        * frame first.
+        */
+       save    %sp, -CCFSZ, %sp
+       mov     %g1, %i0
+       mov     %g2, %i1
+       mov     %g4, %i2
+       mov     %g6, %i3
+       mov     %g7, %i4
+
+       ! zero some pages
+       call    _C_LABEL(uvm_pageidlezero)
+        nop
+
+       ! restore global registers again which are now
+       ! clobbered by uvm_pageidlezero()
+       mov     %i0, %g1
+       mov     %i1, %g2
+       mov     %i2, %g4
+       mov     %i3, %g6
+       mov     %i4, %g7
+       ba,pt   %icc, 1b
+        restore
 
 Lsw_panic_rq:
        sethi   %hi(1f), %o0
@@ -8454,7 +8490,7 @@
        brz,pn  %l3, 1f                                 ! Make sure we have an fpstate
         mov    %l3, %o0
        call    _C_LABEL(savefpstate)                   ! Save the old fpstate
-        set    EINTSTACK, %l4                          ! Are we on intr stack?
+        set    EINTSTACK-STKB, %l4                             ! Are we on intr stack?
        cmp     %sp, %l4
        bgu,pt  %xcc, 1f
         set    INTSTACK, %l4
@@ -8753,7 +8789,7 @@
        brz,pn  %l3, 1f                                 ! Make sure we have an fpstate
         mov    %l3, %o0
        call    _C_LABEL(savefpstate)                   ! Save the old fpstate
-        set    EINTSTACK, %l4                          ! Are we on intr stack?
+        set    EINTSTACK-STKB, %l4                             ! Are we on intr stack?
        cmp     %sp, %l4
        bgu,pt  %xcc, 1f
         set    INTSTACK, %l4
@@ -9611,7 +9647,7 @@
 3:
        stx     %o2, [%o0]              ! Do 1 longword at a time
        deccc   8, %o1
-       bge,pt  %xcc, 3b
+       brgez,pt        %o1, 3b
         inc    8, %o0
 
        /*
@@ -9708,7 +9744,7 @@
        brz,pn  %l3, 1f                                 ! Make sure we have an fpstate
         mov    %l3, %o0
        call    _C_LABEL(savefpstate)                   ! Save the old fpstate
-        set    EINTSTACK, %l4                          ! Are we on intr stack?
+        set    EINTSTACK-STKB, %l4                             ! Are we on intr stack?
        cmp     %sp, %l4
        bgu,pt  %xcc, 1f
         set    INTSTACK, %l4
@@ -9749,15 +9785,15 @@
        btst    1, %fp
        bnz,pt  %icc, 3f                                ! 64-bit stack?
         nop
-       stw     %i2, [%fp + 0x28]                       ! Flush this puppy to RAM
+       stw     %i2, [%sp + 0x8]                        ! Flush this puppy to RAM
        membar  #StoreLoad
-       ld      [%fp + 0x28], %f0
+       ld      [%sp + 0x8], %f0
        ba,pt   %icc, 4f
         fmovsa %icc, %f0, %f1
 3:
-       stx     %i2, [%fp + BIAS + 0x50]                ! Flush this puppy to RAM
+       stx     %i2, [%sp + BIAS + 0x8]         ! Flush this puppy to RAM
        membar  #StoreLoad
-       ldd     [%fp + BIAS + 0x50], %f0
+       ldd     [%sp + BIAS + 0x8], %f0
 4:
        fmovda  %icc, %f0, %f2                          ! Duplicate the pattern
        fmovda  %icc, %f0, %f4