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Slight optimisation in proc_trampoline().

This commit is contained in:
pk 2002-12-31 17:07:36 +00:00
parent 438dc24855
commit 2aac3c7c89
1 changed files with 4 additions and 5 deletions
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9
sys/arch/sparc/sparc/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.173 2002/12/31 16:17:12 pk Exp $ */
/* $NetBSD: locore.s,v 1.174 2002/12/31 17:07:36 pk Exp $ */
/*
* Copyright (c) 1996 Paul Kranenburg
@ -5044,8 +5044,8 @@ ENTRY(proc_trampoline)
#endif
/* Reset interrupt level */
rd %psr, %o0
andn %o0, PSR_PIL, %o0 ! psr &= ~PSR_PIL;
rd %psr, %l2
andn %l2, PSR_PIL, %o0 ! psr &= ~PSR_PIL;
wr %o0, 0, %psr ! (void) spl0();
nop ! psr delay; the next 2 instructions
! can safely be made part of the
@ -5059,9 +5059,8 @@ ENTRY(proc_trampoline)
* in child_return()) will have set the user-space return
* address in tf_pc. In both cases, %npc should be %pc + 4.
*/
rd %psr, %o0
ld [%sp + CCFSZ + 4], %l1 ! pc = tf->tf_pc from cpu_fork()
and %o0, PSR_CWP, %o1 ! keep current CWP
and %l2, PSR_CWP, %o1 ! keep current CWP
or %o1, PSR_S, %l0 ! user psr
b return_from_syscall
add %l1, 4, %l2 ! npc = pc+4