projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
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 |