diff options
| author | David Mosberger-Tang <davidm@hpl.hp.com> | 2005-04-27 21:22:40 -0700 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2005-04-27 21:22:40 -0700 |
| commit | 8e3e50168c8537807b7a6f78588cd72e21363262 (patch) | |
| tree | a63eb89df905efd86a58940286a63c5f670b1c05 /arch/ia64/kernel | |
| parent | e7e965fa1961a8ce32cbbb1bd436c655ad03973e (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')
| -rw-r--r-- | arch/ia64/kernel/gate.S | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/ia64/kernel/gate.S b/arch/ia64/kernel/gate.S index 272e64c0e21..86948ce63e4 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 |