| | 1 | /* |
| | 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 6 | * The contents of this file constitute Original Code as defined in and |
| | 7 | * are subject to the Apple Public Source License Version 1.1 (the |
| | 8 | * "License"). You may not use this file except in compliance with the |
| | 9 | * License. Please obtain a copy of the License at |
| | 10 | * http://www.apple.com/publicsource and read it before using this file. |
| | 11 | * |
| | 12 | * This Original Code and all software distributed under the License are |
| | 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| | 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the |
| | 17 | * License for the specific language governing rights and limitations |
| | 18 | * under the License. |
| | 19 | * |
| | 20 | * @APPLE_LICENSE_HEADER_END@ |
| | 21 | */ |
| | 22 | #include <mach_kdb.h> |
| | 23 | #include <mach_kgdb.h> |
| | 24 | #include <mach_debug.h> |
| | 25 | #include <assym.s> |
| | 26 | #include <ppc/asm.h> |
| | 27 | #include <ppc/proc_reg.h> |
| | 28 | #include <mach/ppc/vm_param.h> |
| | 29 | |
| | 30 | /* void kdp_call_with_ctx(int type, struct ppc_thread_state *ssp) |
| | 31 | * |
| | 32 | * Switch on kdp stack and enter the debugger. On return, |
| | 33 | * switch back to the previous stack |
| | 34 | * |
| | 35 | * If the kdp stack is not free, we allocate ourselves a frame below |
| | 36 | * the current kdp frame. This should never occur in a perfect world. |
| | 37 | */ |
| | 38 | |
| | 39 | ENTRY(kdp_call_with_ctx, TAG_NO_FRAME_USED) |
| | 40 | |
| | 41 | mfmsr r7 /* Get the MSR */ |
| | 42 | mflr r0 |
| | 43 | rlwinm r7,r7,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Turn off interruptions enable bit */ |
| | 44 | mtmsr r7 |
| | 45 | mfsprg r8,0 /* Get the per_proc block address */ |
| | 46 | stw r0, FM_LR_SAVE(r1) /* save lr in the current frame */ |
| | 47 | |
| | 48 | lwz r9, PP_DEBSTACKPTR(r8) /* get kdp stack pointer */ |
| | 49 | cmpwi r9, 0 |
| | 50 | bne 0f |
| | 51 | |
| | 52 | #ifdef LET_KDP_REENTER |
| | 53 | mr r9, r1 /* get current stack pointer */ |
| | 54 | subi r9, r9, FM_REDZONE + SS_SIZE |
| | 55 | #else |
| | 56 | bl EXT(kdp_print_backtrace) |
| | 57 | #endif |
| | 58 | |
| | 59 | 0: |
| | 60 | stw r1, FM_ARG0(r9) /* Store old stack pointer */ |
| | 61 | li r0, 0 |
| | 62 | stw r0, PP_DEBSTACKPTR(r8) /* Mark kdp stack as busy */ |
| | 63 | |
| | 64 | subi r1, r9, FM_SIZE |
| | 65 | stw r0, FM_BACKPTR(r1) |
| | 66 | |
| | 67 | bl EXT(kdp_trap) |
| | 68 | |
| | 69 | mfmsr r0 /* Get the MSR */ |
| | 70 | addi r1, r1, FM_SIZE |
| | 71 | rlwinm r0,r0,0,MSR_EE_BIT+1,MSR_EE_BIT-1 /* Turn off interruptions enable bit */ |
| | 72 | mtmsr r0 |
| | 73 | |
| | 74 | mfsprg r8,0 /* Get the per_proc block address */ |
| | 75 | |
| | 76 | stw r1, PP_DEBSTACKPTR(r8) /* Mark gdb stack as free */ |
| | 77 | lwz r1, FM_ARG0(r1) |
| | 78 | lwz r0, FM_LR_SAVE(r1) |
| | 79 | mtlr r0 |
| | 80 | |
| | 81 | blr |
| | 82 | |
| | 83 | |
projects / apple / xnu.git / blame_incremental