diff options
| author | Miod Vallat <miod@cvs.openbsd.org> | 2007-10-28 10:18:54 +0000 |
|---|---|---|
| committer | Miod Vallat <miod@cvs.openbsd.org> | 2007-10-28 10:18:54 +0000 |
| commit | e702204f9ecfe0f56bae6b5a64cce8793abecf9a (patch) | |
| tree | 829aab14d56590d10329da4956a0178084974799 /sys/arch | |
| parent | a4c86d54d6edd37a2146f78b94160cf49d162dec (diff) | |
When handling a userland data fault occuring in kernel mode, take the kernel
lock with KERNEL_LOCK, not KERNEL_PROC_LOCK. This lets bsd.mp run multiuser
on a single-processor board.
Diffstat (limited to 'sys/arch')
| -rw-r--r-- | sys/arch/m88k/m88k/trap.c | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/sys/arch/m88k/m88k/trap.c b/sys/arch/m88k/m88k/trap.c index ff37a4ac9a0..fda565353e8 100644 --- a/sys/arch/m88k/m88k/trap.c +++ b/sys/arch/m88k/m88k/trap.c @@ -1,4 +1,4 @@ -/* $OpenBSD: trap.c,v 1.40 2007/05/11 10:06:55 pedro Exp $ */ +/* $OpenBSD: trap.c,v 1.41 2007/10/28 10:18:53 miod Exp $ */ /* * Copyright (c) 2004, Miodrag Vallat. * Copyright (c) 1998 Steve Murphree, Jr. @@ -264,7 +264,7 @@ m88100_trap(unsigned type, struct trapframe *frame) /* data fault on the user address? */ if ((frame->tf_dmt0 & DMT_DAS) == 0) { - type = T_DATAFLT + T_USER; + KERNEL_LOCK(); goto user_fault; } @@ -337,6 +337,7 @@ m88100_trap(unsigned type, struct trapframe *frame) /* User mode instruction access fault */ /* FALLTHROUGH */ case T_DATAFLT+T_USER: + KERNEL_PROC_LOCK(p); user_fault: if (type == T_INSTFLT + T_USER) { pbus_type = CMMU_PFSR_FAULT(frame->tf_ipfsr); @@ -365,7 +366,6 @@ user_fault: va = trunc_page((vaddr_t)fault_addr); - KERNEL_PROC_LOCK(p); vm = p->p_vmspace; map = &vm->vm_map; if ((pcb_onfault = p->p_addr->u_pcb.pcb_onfault) != 0) @@ -392,7 +392,10 @@ user_fault: else if (result == EACCES) result = EFAULT; } - KERNEL_PROC_UNLOCK(p); + if (type == T_DATAFLT) + KERNEL_UNLOCK(); + else + KERNEL_PROC_UNLOCK(p); /* * This could be a fault caused in copyin*() @@ -411,7 +414,15 @@ user_fault: } if (result == 0) { - if (type == T_DATAFLT+T_USER) { + if (type == T_INSTFLT + T_USER) { + /* + * back up SXIP, SNIP, + * clearing the Error bit + */ + frame->tf_sfip = frame->tf_snip & ~FIP_E; + frame->tf_snip = frame->tf_sxip & ~NIP_E; + frame->tf_ipfsr = 0; + } else { /* * We could resolve the fault. Call * data_access_emulation to drain the data unit @@ -421,14 +432,6 @@ user_fault: data_access_emulation((unsigned *)frame); frame->tf_dpfsr = 0; frame->tf_dmt0 = 0; - } else { - /* - * back up SXIP, SNIP, - * clearing the Error bit - */ - frame->tf_sfip = frame->tf_snip & ~FIP_E; - frame->tf_snip = frame->tf_sxip & ~NIP_E; - frame->tf_ipfsr = 0; } } else { sig = result == EACCES ? SIGBUS : SIGSEGV; |