/* * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This Original Code and all software distributed under the License are * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the * License for the specific language governing rights and limitations * under the License. * * @APPLE_LICENSE_HEADER_END@ */ #include <mach_kdb.h> #include <mach_kgdb.h> #include <mach_debug.h> #include <assym.s> #include <ppc/asm.h> #include <ppc/proc_reg.h> #include <mach/ppc/vm_param.h> /* void kdp_call_with_ctx(int type, struct ppc_thread_state *ssp) * * Switch on kdp stack and enter the debugger. On return, * switch back to the previous stack * * If the kdp stack is not free, we allocate ourselves a frame below * the current kdp frame. This should never occur in a perfect world. */ ENTRY(kdp_call_with_ctx, TAG_NO_FRAME_USED) mfmsr r7 /* Get the MSR */ mflr r0 rlwinm r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Turn off interruptions enable bit */ mtmsr r7 mfsprg r8,0 /* Get the per_proc block address */ stw r0, FM_LR_SAVE(r1) /* save lr in the current frame */ lwz r9, PP_DEBSTACKPTR(r8) /* get kdp stack pointer */ cmpwi r9, 0 bne 0f #ifdef LET_KDP_REENTER mr r9, r1 /* get current stack pointer */ subi r9, r9, FM_REDZONE + SS_SIZE #else bl EXT(kdp_print_backtrace) #endif 0: stw r1, FM_ARG0(r9) /* Store old stack pointer */ li r0, 0 stw r0, PP_DEBSTACKPTR(r8) /* Mark kdp stack as busy */ subi r1, r9, FM_SIZE stw r0, FM_BACKPTR(r1) bl EXT(kdp_trap) mfmsr r0 /* Get the MSR */ addi r1, r1, FM_SIZE rlwinm r0,r0,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Turn off interruptions enable bit */ mtmsr r0 mfsprg r8,0 /* Get the per_proc block address */ stw r1, PP_DEBSTACKPTR(r8) /* Mark gdb stack as free */ lwz r1, FM_ARG0(r1) lwz r0, FM_LR_SAVE(r1) mtlr r0 blr