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 | * | |
| 37839358 A |
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. | |
| 1c79356b | 11 | * |
| 37839358 A |
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 | |
| 1c79356b A |
14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 37839358 A |
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. | |
| 1c79356b A |
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 | ||
| 55e303ae A |
41 | lis r2,hi16(MASK(MSR_VEC)) ; Get the vector enable |
| 42 | mfmsr r7 ; Get the MSR | |
| 43 | ori r2,r2,lo16(MASK(MSR_EE)|MASK(MSR_FP)) ; Get FP and EE | |
| 1c79356b | 44 | mflr r0 |
| 55e303ae | 45 | andc r7,r7,r2 ; Clear FP, VEC, and EE |
| 1c79356b | 46 | mtmsr r7 |
| 9bccf70c | 47 | isync ; Need this because we may have ditched fp/vec |
| 1c79356b A |
48 | mfsprg r8,0 /* Get the per_proc block address */ |
| 49 | stw r0, FM_LR_SAVE(r1) /* save lr in the current frame */ | |
| 50 | ||
| 51 | lwz r9, PP_DEBSTACKPTR(r8) /* get kdp stack pointer */ | |
| 52 | cmpwi r9, 0 | |
| 53 | bne 0f | |
| 54 | ||
| 55 | #ifdef LET_KDP_REENTER | |
| 56 | mr r9, r1 /* get current stack pointer */ | |
| 0b4e3aa0 | 57 | subi r9, r9, FM_REDZONE + FM_SIZE |
| 1c79356b A |
58 | #else |
| 59 | bl EXT(kdp_print_backtrace) | |
| 60 | #endif | |
| 61 | ||
| 62 | 0: | |
| 63 | stw r1, FM_ARG0(r9) /* Store old stack pointer */ | |
| 64 | li r0, 0 | |
| 65 | stw r0, PP_DEBSTACKPTR(r8) /* Mark kdp stack as busy */ | |
| 66 | ||
| 67 | subi r1, r9, FM_SIZE | |
| 68 | stw r0, FM_BACKPTR(r1) | |
| 69 | ||
| 70 | bl EXT(kdp_trap) | |
| 71 | ||
| 55e303ae | 72 | lis r2,hi16(MASK(MSR_VEC)) ; Get the vector enable |
| 1c79356b | 73 | mfmsr r0 /* Get the MSR */ |
| 55e303ae | 74 | ori r2,r2,lo16(MASK(MSR_EE)|MASK(MSR_FP)) ; Get FP and EE |
| 1c79356b | 75 | addi r1, r1, FM_SIZE |
| 55e303ae | 76 | andc r0,r0,r2 ; Clear FP, VEC, and EE |
| 1c79356b | 77 | mtmsr r0 |
| 55e303ae | 78 | isync ; Need this because we may have ditched fp/vec |
| 1c79356b A |
79 | |
| 80 | mfsprg r8,0 /* Get the per_proc block address */ | |
| 81 | ||
| 82 | stw r1, PP_DEBSTACKPTR(r8) /* Mark gdb stack as free */ | |
| 83 | lwz r1, FM_ARG0(r1) | |
| 84 | lwz r0, FM_LR_SAVE(r1) | |
| 85 | mtlr r0 | |
| 86 | ||
| 87 | blr | |
| 88 | ||
| 89 |