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authorDavid Mosberger-Tang <davidm@hpl.hp.com>2005-04-27 21:22:40 -0700
committerTony Luck <tony.luck@intel.com>2005-04-27 21:22:40 -0700
commit8e3e50168c8537807b7a6f78588cd72e21363262 (patch)
treea63eb89df905efd86a58940286a63c5f670b1c05 /arch/ia64/kernel/gate.S
parente7e965fa1961a8ce32cbbb1bd436c655ad03973e (diff)
[IA64] need r29=psr *after* rsm psr.i
Yanmin Zhang pointed out a sequence problem when saving the psr. David Mosberger provided this patch (which gave up a cycle). Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/gate.S')
-rw-r--r--arch/ia64/kernel/gate.S11
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/ia64/kernel/gate.S b/arch/ia64/kernel/gate.S
index 272e64c0e21b..86948ce63e43 100644
--- a/arch/ia64/kernel/gate.S
+++ b/arch/ia64/kernel/gate.S
@@ -77,7 +77,7 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
epc // B causes split-issue
}
;;
- rsm psr.be // M2 (5 cyc to srlz.d)
+ rsm psr.be | psr.i // M2 (5 cyc to srlz.d)
LOAD_FSYSCALL_TABLE(r14) // X
;;
mov r16=IA64_KR(CURRENT) // M2 (12 cyc)
@@ -98,15 +98,14 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
nop.i 0
;;
nop.m 0
-(p6) mov b7=r18 // I0
(p6) tbit.z.unc p8,p0=r18,0 // I0 (dual-issues with "mov b7=r18"!)
-
- nop.m 0
nop.i 0
+ ;;
+(p8) ssm psr.i
+(p6) mov b7=r18 // I0
(p8) br.dptk.many b7 // B
mov r27=ar.rsc // M2 (12 cyc)
-(p6) rsm psr.i // M2
/*
* brl.cond doesn't work as intended because the linker would convert this branch
* into a branch to a PLT. Perhaps there will be a way to avoid this with some
@@ -123,7 +122,7 @@ GLOBAL_ENTRY(__kernel_syscall_via_epc)
#else
BRL_COND_FSYS_BUBBLE_DOWN(p6)
#endif
-
+ ssm psr.i
mov r10=-1
(p10) mov r8=EINVAL
(p9) mov r8=ENOSYS