diff options
Diffstat (limited to 'sys/arch/hp300/hp300/locore.s')
| -rw-r--r-- | sys/arch/hp300/hp300/locore.s | 105 |
1 files changed, 1 insertions, 104 deletions
diff --git a/sys/arch/hp300/hp300/locore.s b/sys/arch/hp300/hp300/locore.s index 98f31668f9a..514efd22c11 100644 --- a/sys/arch/hp300/hp300/locore.s +++ b/sys/arch/hp300/hp300/locore.s @@ -1,6 +1,4 @@ -/* $NetBSD: locore.s,v 1.46 1995/12/11 17:09:11 thorpej Exp $ */ - -#undef STACKCHECK /* doesn't work any more */ +/* $NetBSD: locore.s,v 1.47 1996/01/16 22:24:28 thorpej Exp $ */ /* * Copyright (c) 1988 University of Utah. @@ -44,19 +42,6 @@ * @(#)locore.s 8.6 (Berkeley) 5/27/94 */ -/* - * STACKCHECK enables two types of kernel stack checking: - * 1. stack "overflow". On every clock interrupt we ensure that - * the current kernel stack has not grown into the user struct - * page, i.e. size exceeded UPAGES-1 pages. - * 2. stack "underflow". Before every rte to user mode we ensure - * that we will be exactly at the base of the stack after the - * exception frame has been popped. - * Both checks are performed at splclock since they operate on the - * global temporary stack. - */ -/* #define STACKCHECK */ - #include "assym.s" #include <hp300/hp300/vectors.s> @@ -417,11 +402,7 @@ Ltrap1: movl a0,usp | user SP moveml sp@+,#0x7FFF | restore most registers addql #8,sp | pop SP and stack adjust -#ifdef STACKCHECK - jra Ldorte -#else rte -#endif /* * Routines for traps 1 and 2. The meaning of the two traps depends @@ -607,26 +588,6 @@ Lnotdma: jra rei _lev6intr: -#ifdef STACKCHECK - .globl _panicstr,_badkstack - cmpl #_kstack+NBPG,sp | are we still in stack page? - jcc Lstackok | yes, continue normally - tstl _curproc | if !curproc could have switch_exited, - jeq Lstackok | might be on tmpstk - tstl _panicstr | have we paniced? - jne Lstackok | yes, do not re-panic - movl sp@(4),tmpstk-4 | no, copy common - movl sp@,tmpstk-8 | frame info - movl sp,tmpstk-16 | no, save original SP - lea tmpstk-16,sp | switch to tmpstk - moveml #0xFFFE,sp@- | push remaining registers - movl #1,sp@- | is an overflow - jbsr _badkstack | badkstack(1, frame) - addql #4,sp - moveml sp@+,#0x7FFF | restore most registers - movl sp@,sp | and SP -Lstackok: -#endif moveml #0xC0C0,sp@- | save scratch registers CLKADDR(a0) movb a0@(CLKSR),d0 | read clock status @@ -725,10 +686,6 @@ _lev7intr: .globl _astpending .globl rei rei: -#ifdef STACKCHECK - tstl _panicstr | have we paniced? - jne Ldorte1 | yes, do not make matters worse -#endif tstl _astpending | AST pending? jeq Lchksir | no, go check for SIR Lrei1: @@ -751,11 +708,7 @@ Lrei2: jne Laststkadj | yes, go to it moveml sp@+,#0x7FFF | no, restore most user regs addql #8,sp | toss SP and stack adjust -#ifdef STACKCHECK - jra Ldorte -#else rte | and do real RTE -#endif Laststkadj: lea sp@(FR_HW),a1 | pointer to HW frame addql #8,a1 | source pointer @@ -766,11 +719,7 @@ Laststkadj: movl a0,sp@(FR_SP) | new SSP moveml sp@+,#0x7FFF | restore user registers movl sp@,sp | and our SP -#ifdef STACKCHECK - jra Ldorte -#else rte | and do real RTE -#endif Lchksir: tstb _ssir | SIR pending? jeq Ldorte | no, all done @@ -797,64 +746,12 @@ Lsir1: movl a0,usp | user SP moveml sp@+,#0x7FFF | and all remaining registers addql #8,sp | pop SP and stack adjust -#ifdef STACKCHECK - jra Ldorte -#else rte -#endif Lnosir: movl sp@+,d0 | restore scratch register Ldorte: -#ifdef STACKCHECK - movw #SPL6,sr | avoid trouble - btst #5,sp@ | are we returning to user mode? - jne Ldorte1 | no, skip it - movl a6,tmpstk-20 - movl d0,tmpstk-76 - moveq #0,d0 - movb sp@(6),d0 | get format/vector - lsrl #3,d0 | convert to index - lea _exframesize,a6 | into exframesize - addl d0,a6 | to get pointer to correct entry - movw a6@,d0 | get size for this frame - addql #8,d0 | adjust for unaccounted for bytes - lea _kstackatbase,a6 | desired stack base - subl d0,a6 | - frame size == our stack - cmpl a6,sp | are we where we think? - jeq Ldorte2 | yes, skip it - lea tmpstk,a6 | will be using tmpstk - movl sp@(4),a6@- | copy common - movl sp@,a6@- | frame info - clrl a6@- - movl sp,a6@- | save sp - subql #4,a6 | skip over already saved a6 - moveml #0x7FFC,a6@- | push remaining regs (d0/a6/a7 done) - lea a6@(-4),sp | switch to tmpstk (skip saved d0) - clrl sp@- | is an underflow - jbsr _badkstack | badkstack(0, frame) - addql #4,sp - moveml sp@+,#0x7FFF | restore most registers - movl sp@,sp | and SP - rte -Ldorte2: - movl tmpstk-76,d0 - movl tmpstk-20,a6 -Ldorte1: -#endif rte | real return -#ifdef STACKCHECK -/* - * Kernel access to the current processes kernel stack is via a fixed - * virtual address. It is at the same address as in the users VA space. - */ - .data - .set _kstack,USRSTACK - .set _kstackatbase,USRSTACK+USPACE-4 - .globl _kstackatbase - .globl _kstack -#endif - #define RELOC(var, ar) \ lea var,ar; \ addl a5,ar |