[src/trunk]: src/sys/arch/sparc64/sparc64 Fix the fork trampoline to properly...

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

details:   https://anonhg.NetBSD.org/src/rev/b4290fa7cd62
branches:  trunk
changeset: 532278:b4290fa7cd62
user:      eeh <eeh%NetBSD.org@localhost>
date:      Tue Jun 04 15:04:08 2002 +0000

description:
Fix the fork trampoline to properly use the supplied tstate.

diffstat:

 sys/arch/sparc64/sparc64/locore.s |  25 +++++++------------------
 1 files changed, 7 insertions(+), 18 deletions(-)

diffs (53 lines):

diff -r 483b57b30390 -r b4290fa7cd62 sys/arch/sparc64/sparc64/locore.s
--- a/sys/arch/sparc64/sparc64/locore.s Tue Jun 04 14:49:15 2002 +0000
+++ b/sys/arch/sparc64/sparc64/locore.s Tue Jun 04 15:04:08 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: locore.s,v 1.154 2002/05/31 20:01:28 thorpej Exp $     */
+/*     $NetBSD: locore.s,v 1.155 2002/06/04 15:04:08 eeh Exp $ */
 
 /*
  * Copyright (c) 1996-2002 Eduardo Horvath
@@ -60,7 +60,9 @@
 #define        INTR_INTERLOCK          /* Use IH_PEND field to interlock interrupts */
 #undef PARANOID                /* Extremely expensive consistency checks */
 #undef NO_VCACHE               /* Map w/D$ disabled */
+#ifdef DEBUG
 #define        TRAPTRACE               /* Keep history of all traps (unsafe) */
+#endif
 #undef FLTRACE                 /* Keep history of all page faults */
 #undef TRAPSTATS               /* Count traps */
 #undef TRAPS_USE_IG            /* Use Interrupt Globals for all traps */
@@ -7982,29 +7984,16 @@
         * have only set npc, in anticipation that trap.c will advance past
         * the trap instruction; but we bypass that, so we must do it manually.
         */
-!      save    %sp, -CC64FSZ, %sp              ! Save a kernel frame to emulate a syscall
-#if 0
-       /* This code doesn't seem to work, but it should. */
        ldx     [%sp + CC64FSZ + STKB + TF_TSTATE], %g1
        ldx     [%sp + CC64FSZ + STKB + TF_NPC], %g2    ! pc = tf->tf_npc from execve/fork
-       andn    %g1, CWP, %g1                   ! Clear the CWP bits
+!      rdpr    %cwp, %g5                       ! Fixup %cwp in %tstate
+       srl     %g1, 0, %g1                     ! Clear out the condition codes
        add     %g2, 4, %g3                     ! npc = pc+4
-       rdpr    %cwp, %g5                       ! Fixup %cwp in %tstate
+!      andn    %g1, CWP, %g1                   ! Clear the CWP bits
        stx     %g3, [%sp + CC64FSZ + STKB + TF_NPC]
-       or      %g1, %g5, %g1
+!      or      %g1, %g5, %g1   ! Not needed
        stx     %g2, [%sp + CC64FSZ + STKB + TF_PC]
        stx     %g1, [%sp + CC64FSZ + STKB + TF_TSTATE]
-#else
-       mov     PSTATE_USER, %g1                ! XXXX user pstate (no need to load it)
-       ldx     [%sp + CC64FSZ + STKB + TF_NPC], %g2    ! pc = tf->tf_npc from execve/fork
-       sllx    %g1, TSTATE_PSTATE_SHIFT, %g1   ! Shift it into place
-       add     %g2, 4, %g3                     ! npc = pc+4
-       rdpr    %cwp, %g5                       ! Fixup %cwp in %tstate
-       stx     %g3, [%sp + CC64FSZ + STKB + TF_NPC]
-       or      %g1, %g5, %g1
-       stx     %g2, [%sp + CC64FSZ + STKB + TF_PC]
-       stx     %g1, [%sp + CC64FSZ + STKB + TF_TSTATE]
-#endif
 #ifdef SCHED_DEBUG
 !      set     panicstack-CC64FSZ-STKB, %o0! DEBUG
 !      save    %g0, %o0, %sp   ! DEBUG