diff options
| author | Miod Vallat <miod@cvs.openbsd.org> | 2007-10-18 18:15:41 +0000 |
|---|---|---|
| committer | Miod Vallat <miod@cvs.openbsd.org> | 2007-10-18 18:15:41 +0000 |
| commit | 86e465de7e80c0ae14bdf9e9352a033b9ff71737 (patch) | |
| tree | e6ab9068ec0ff20717cd054f8e635c7b4414175f /sys/arch/mips64 | |
| parent | d759993d3032b53746fd5ed722e559b38ad3b92e (diff) | |
Make sure interrupts are really enabled at the beginning of proc_trampoline,
tested by deraadt@ jsing@
Diffstat (limited to 'sys/arch/mips64')
| -rw-r--r-- | sys/arch/mips64/mips64/exception.S | 31 |
1 files changed, 23 insertions, 8 deletions
diff --git a/sys/arch/mips64/mips64/exception.S b/sys/arch/mips64/mips64/exception.S index 62abea8351f..b930ee848ed 100644 --- a/sys/arch/mips64/mips64/exception.S +++ b/sys/arch/mips64/mips64/exception.S @@ -1,4 +1,4 @@ -/* $OpenBSD: exception.S,v 1.14 2007/09/03 01:15:50 krw Exp $ */ +/* $OpenBSD: exception.S,v 1.15 2007/10/18 18:15:40 miod Exp $ */ /* * Copyright (c) 2002-2003 Opsycon AB (www.opsycon.se / www.opsycon.com) @@ -601,16 +601,33 @@ END(u_syscall) * Setup for and return to user. */ LEAF(proc_trampoline, 0) + /* + * Enable interrupts, since we want kernel threads to + * start at spl0 and with interrupts enabled, and these + * won't ``return to userland''. + */ sw zero, cpl # lower to spl0 lw t0, ipending - beq t0, zero, 0f + beqz t0, 1f nop jal setsoftintr0 # process any pending ints nop -0: +1: +#ifdef IMASK_EXTERNAL + jal hw_setintrmask + xor a0, a0 +#endif + jal updateimask # Make sure SR imask is updated + xor a0, a0 + + mfc0 t0, COP_0_STATUS_REG # enable interrupts + ori t0, SR_INT_ENAB + mtc0 t0, COP_0_STATUS_REG + ITLBNOPFIX + jal s0 - move a0,s1 # set up for return to user. + move a0,s1 # invoke callback. #if 0 lw t0, cpu_is_rm7k @@ -634,12 +651,10 @@ LEAF(proc_trampoline, 0) ctc0 v0, COP_0_ICR # enable perfcntr interrupt. 1: #endif - mfc0 t0, COP_0_STATUS_REG # dis int preserve settings. + + mfc0 t0, COP_0_STATUS_REG li t1, ~SR_INT_ENAB and t0, t0, t1 - mtc0 t0, COP_0_STATUS_REG - ITLBNOPFIX - ori t0, SR_EXL # restoring to user mode. mtc0 t0, COP_0_STATUS_REG # must set exception level bit. ITLBNOPFIX |