projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 8ad349bb | 4 | * @APPLE_LICENSE_OSREFERENCE_HEADER_START@ |
| 1c79356b | 5 | * |
| 8ad349bb A |
6 | * This file contains Original Code and/or Modifications of Original Code |
| 7 | * as defined in and that are subject to the Apple Public Source License | |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in | |
| 9 | * compliance with the License. The rights granted to you under the | |
| 10 | * License may not be used to create, or enable the creation or | |
| 11 | * redistribution of, unlawful or unlicensed copies of an Apple operating | |
| 12 | * system, or to circumvent, violate, or enable the circumvention or | |
| 13 | * violation of, any terms of an Apple operating system software license | |
| 14 | * agreement. | |
| 15 | * | |
| 16 | * Please obtain a copy of the License at | |
| 17 | * http://www.opensource.apple.com/apsl/ and read it before using this | |
| 18 | * file. | |
| 19 | * | |
| 20 | * The Original Code and all software distributed under the License are | |
| 21 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 22 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, | |
| 23 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 24 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. | |
| 25 | * Please see the License for the specific language governing rights and | |
| 26 | * limitations under the License. | |
| 27 | * | |
| 28 | * @APPLE_LICENSE_OSREFERENCE_HEADER_END@ | |
| 1c79356b A |
29 | */ |
| 30 | #include <mach_kdb.h> | |
| 31 | #include <mach_kgdb.h> | |
| 32 | #include <mach_debug.h> | |
| 33 | #include <assym.s> | |
| 34 | #include <ppc/asm.h> | |
| 35 | #include <ppc/proc_reg.h> | |
| 36 | #include <mach/ppc/vm_param.h> | |
| 37 | ||
| 38 | /* void kdp_call_with_ctx(int type, struct ppc_thread_state *ssp) | |
| 39 | * | |
| 40 | * Switch on kdp stack and enter the debugger. On return, | |
| 41 | * switch back to the previous stack | |
| 42 | * | |
| 43 | * If the kdp stack is not free, we allocate ourselves a frame below | |
| 44 | * the current kdp frame. This should never occur in a perfect world. | |
| 45 | */ | |
| 46 | ||
| 47 | ENTRY(kdp_call_with_ctx, TAG_NO_FRAME_USED) | |
| 48 | ||
| 55e303ae A |
49 | lis r2,hi16(MASK(MSR_VEC)) ; Get the vector enable |
| 50 | mfmsr r7 ; Get the MSR | |
| 51 | ori r2,r2,lo16(MASK(MSR_EE)|MASK(MSR_FP)) ; Get FP and EE | |
| 1c79356b | 52 | mflr r0 |
| 55e303ae | 53 | andc r7,r7,r2 ; Clear FP, VEC, and EE |
| 1c79356b | 54 | mtmsr r7 |
| 9bccf70c | 55 | isync ; Need this because we may have ditched fp/vec |
| 1c79356b A |
56 | mfsprg r8,0 /* Get the per_proc block address */ |
| 57 | stw r0, FM_LR_SAVE(r1) /* save lr in the current frame */ | |
| 58 | ||
| 59 | lwz r9, PP_DEBSTACKPTR(r8) /* get kdp stack pointer */ | |
| 60 | cmpwi r9, 0 | |
| 61 | bne 0f | |
| 62 | ||
| 63 | #ifdef LET_KDP_REENTER | |
| 64 | mr r9, r1 /* get current stack pointer */ | |
| 0b4e3aa0 | 65 | subi r9, r9, FM_REDZONE + FM_SIZE |
| 1c79356b A |
66 | #else |
| 67 | bl EXT(kdp_print_backtrace) | |
| 68 | #endif | |
| 69 | ||
| 70 | 0: | |
| 71 | stw r1, FM_ARG0(r9) /* Store old stack pointer */ | |
| 72 | li r0, 0 | |
| 73 | stw r0, PP_DEBSTACKPTR(r8) /* Mark kdp stack as busy */ | |
| 74 | ||
| 75 | subi r1, r9, FM_SIZE | |
| 76 | stw r0, FM_BACKPTR(r1) | |
| 77 | ||
| 78 | bl EXT(kdp_trap) | |
| 79 | ||
| 55e303ae | 80 | lis r2,hi16(MASK(MSR_VEC)) ; Get the vector enable |
| 1c79356b | 81 | mfmsr r0 /* Get the MSR */ |
| 55e303ae | 82 | ori r2,r2,lo16(MASK(MSR_EE)|MASK(MSR_FP)) ; Get FP and EE |
| 1c79356b | 83 | addi r1, r1, FM_SIZE |
| 55e303ae | 84 | andc r0,r0,r2 ; Clear FP, VEC, and EE |
| 1c79356b | 85 | mtmsr r0 |
| 55e303ae | 86 | isync ; Need this because we may have ditched fp/vec |
| 1c79356b A |
87 | |
| 88 | mfsprg r8,0 /* Get the per_proc block address */ | |
| 89 | ||
| 90 | stw r1, PP_DEBSTACKPTR(r8) /* Mark gdb stack as free */ | |
| 91 | lwz r1, FM_ARG0(r1) | |
| 92 | lwz r0, FM_LR_SAVE(r1) | |
| 93 | mtlr r0 | |
| 94 | ||
| 95 | blr | |
| 96 | ||
| 97 |