| | 1 | /* |
| | 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. |
| | 7 | * |
| | 8 | * This file contains Original Code and/or Modifications of Original Code |
| | 9 | * as defined in and that are subject to the Apple Public Source License |
| | 10 | * Version 2.0 (the 'License'). You may not use this file except in |
| | 11 | * compliance with the License. Please obtain a copy of the License at |
| | 12 | * http://www.opensource.apple.com/apsl/ and read it before using this |
| | 13 | * file. |
| | 14 | * |
| | 15 | * The Original Code and all software distributed under the License are |
| | 16 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 17 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 18 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 19 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
| | 20 | * Please see the License for the specific language governing rights and |
| | 21 | * limitations under the License. |
| | 22 | * |
| | 23 | * @APPLE_LICENSE_HEADER_END@ |
| | 24 | */ |
| | 25 | #include <mach_kdb.h> |
| | 26 | #include <mach_kgdb.h> |
| | 27 | #include <mach_debug.h> |
| | 28 | #include <assym.s> |
| | 29 | #include <ppc/asm.h> |
| | 30 | #include <ppc/proc_reg.h> |
| | 31 | #include <mach/ppc/vm_param.h> |
| | 32 | |
| | 33 | /* void kdp_call_with_ctx(int type, struct ppc_thread_state *ssp) |
| | 34 | * |
| | 35 | * Switch on kdp stack and enter the debugger. On return, |
| | 36 | * switch back to the previous stack |
| | 37 | * |
| | 38 | * If the kdp stack is not free, we allocate ourselves a frame below |
| | 39 | * the current kdp frame. This should never occur in a perfect world. |
| | 40 | */ |
| | 41 | |
| | 42 | ENTRY(kdp_call_with_ctx, TAG_NO_FRAME_USED) |
| | 43 | |
| | 44 | lis r2,hi16(MASK(MSR_VEC)) ; Get the vector enable |
| | 45 | mfmsr r7 ; Get the MSR |
| | 46 | ori r2,r2,lo16(MASK(MSR_EE)|MASK(MSR_FP)) ; Get FP and EE |
| | 47 | mflr r0 |
| | 48 | andc r7,r7,r2 ; Clear FP, VEC, and EE |
| | 49 | mtmsr r7 |
| | 50 | isync ; Need this because we may have ditched fp/vec |
| | 51 | mfsprg r8,0 /* Get the per_proc block address */ |
| | 52 | stw r0, FM_LR_SAVE(r1) /* save lr in the current frame */ |
| | 53 | |
| | 54 | lwz r9, PP_DEBSTACKPTR(r8) /* get kdp stack pointer */ |
| | 55 | cmpwi r9, 0 |
| | 56 | bne 0f |
| | 57 | |
| | 58 | #ifdef LET_KDP_REENTER |
| | 59 | mr r9, r1 /* get current stack pointer */ |
| | 60 | subi r9, r9, FM_REDZONE + FM_SIZE |
| | 61 | #else |
| | 62 | bl EXT(kdp_print_backtrace) |
| | 63 | #endif |
| | 64 | |
| | 65 | 0: |
| | 66 | stw r1, FM_ARG0(r9) /* Store old stack pointer */ |
| | 67 | li r0, 0 |
| | 68 | stw r0, PP_DEBSTACKPTR(r8) /* Mark kdp stack as busy */ |
| | 69 | |
| | 70 | subi r1, r9, FM_SIZE |
| | 71 | stw r0, FM_BACKPTR(r1) |
| | 72 | |
| | 73 | bl EXT(kdp_trap) |
| | 74 | |
| | 75 | lis r2,hi16(MASK(MSR_VEC)) ; Get the vector enable |
| | 76 | mfmsr r0 /* Get the MSR */ |
| | 77 | ori r2,r2,lo16(MASK(MSR_EE)|MASK(MSR_FP)) ; Get FP and EE |
| | 78 | addi r1, r1, FM_SIZE |
| | 79 | andc r0,r0,r2 ; Clear FP, VEC, and EE |
| | 80 | mtmsr r0 |
| | 81 | isync ; Need this because we may have ditched fp/vec |
| | 82 | |
| | 83 | mfsprg r8,0 /* Get the per_proc block address */ |
| | 84 | |
| | 85 | stw r1, PP_DEBSTACKPTR(r8) /* Mark gdb stack as free */ |
| | 86 | lwz r1, FM_ARG0(r1) |
| | 87 | lwz r0, FM_LR_SAVE(r1) |
| | 88 | mtlr r0 |
| | 89 | |
| | 90 | blr |
| | 91 | |
| | 92 | |
projects / apple / xnu.git / blame_incremental