1/* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28#include <mach_kdb.h> 29#include <mach_kgdb.h> 30#include <mach_debug.h> 31#include <assym.s> 32#include <ppc/asm.h> 33#include <ppc/proc_reg.h> 34#include <mach/ppc/vm_param.h> 35 36/* void kdp_call_with_ctx(int type, struct ppc_thread_state *ssp) 37 * 38 * Switch on kdp stack and enter the debugger. On return, 39 * switch back to the previous stack 40 * 41 * If the kdp stack is not free, we allocate ourselves a frame below 42 * the current kdp frame. This should never occur in a perfect world. 43 */ 44 45ENTRY(kdp_call_with_ctx, TAG_NO_FRAME_USED) 46 47 lis r2,hi16(MASK(MSR_VEC)) ; Get the vector enable 48 mfmsr r7 ; Get the MSR 49 ori r2,r2,lo16(MASK(MSR_EE)|MASK(MSR_FP)) ; Get FP and EE 50 mflr r0 51 andc r7,r7,r2 ; Clear FP, VEC, and EE 52 mtmsr r7 53 isync ; Need this because we may have ditched fp/vec 54 mfsprg r8,0 /* Get the per_proc block address */ 55 stw r0, FM_LR_SAVE(r1) /* save lr in the current frame */ 56 57 lwz r9, PP_DEBSTACKPTR(r8) /* get kdp stack pointer */ 58 cmpwi r9, 0 59 bne 0f 60 61#ifdef LET_KDP_REENTER 62 mr r9, r1 /* get current stack pointer */ 63 subi r9, r9, FM_REDZONE + FM_SIZE 64#else 65 bl EXT(kdp_print_backtrace) 66#endif 67 680: 69 stw r1, FM_ARG0(r9) /* Store old stack pointer */ 70 li r0, 0 71 stw r0, PP_DEBSTACKPTR(r8) /* Mark kdp stack as busy */ 72 73 subi r1, r9, FM_SIZE 74 stw r0, FM_BACKPTR(r1) 75 76 bl EXT(kdp_trap) 77 78 lis r2,hi16(MASK(MSR_VEC)) ; Get the vector enable 79 mfmsr r0 /* Get the MSR */ 80 ori r2,r2,lo16(MASK(MSR_EE)|MASK(MSR_FP)) ; Get FP and EE 81 addi r1, r1, FM_SIZE 82 andc r0,r0,r2 ; Clear FP, VEC, and EE 83 mtmsr r0 84 isync ; Need this because we may have ditched fp/vec 85 86 mfsprg r8,0 /* Get the per_proc block address */ 87 88 stw r1, PP_DEBSTACKPTR(r8) /* Mark gdb stack as free */ 89 lwz r1, FM_ARG0(r1) 90 lwz r0, FM_LR_SAVE(r1) 91 mtlr r0 92 93 blr 94 95 96