/*
* 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)
lis r2,hi16(MASK(MSR_VEC)) ori r2,r2,lo16(MASK(MSR_EE)|MASK(MSR_FP)) andc r7,r7,r2 isync 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 + FM_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)
lis r2,hi16(MASK(MSR_VEC)) ori r2,r2,lo16(MASK(MSR_EE)|MASK(MSR_FP)) andc r0,r0,r2 isync 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