projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b920de1b DH |
1 | /* MN10300 Microcontroller core system register definitions -*- asm -*- |
| 2 | * | |
| 3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
| 4 | * Written by David Howells (dhowells@redhat.com) | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU General Public Licence | |
| 8 | * as published by the Free Software Foundation; either version | |
| 9 | * 2 of the Licence, or (at your option) any later version. | |
| 10 | */ | |
| 11 | #ifndef _ASM_FRAME_INC | |
| 12 | #define _ASM_FRAME_INC | |
| 13 | ||
| 14 | #ifndef __ASSEMBLY__ | |
| 15 | #error not for use in C files | |
| 16 | #endif | |
| 17 | ||
| 18 | #ifndef __ASM_OFFSETS_H__ | |
| 19 | #include <asm/asm-offsets.h> | |
| 20 | #endif | |
| 7c7fcf76 | 21 | #include <asm/thread_info.h> |
| b920de1b DH |
22 | |
| 23 | #define pi break | |
| 24 | ||
| 25 | #define fp a3 | |
| 26 | ||
| 27 | ############################################################################### | |
| 28 | # | |
| 29 | # build a stack frame from the registers | |
| 30 | # - the caller has subtracted 4 from SP before coming here | |
| 31 | # | |
| 32 | ############################################################################### | |
| 33 | .macro SAVE_ALL | |
| 34 | add -4,sp # next exception frame ptr save area | |
| 35 | movm [other],(sp) | |
| 36 | mov usp,a1 | |
| 37 | mov a1,(sp) # USP in MOVM[other] dummy slot | |
| 38 | movm [d2,d3,a2,a3,exreg0,exreg1,exother],(sp) | |
| 39 | mov sp,fp # FRAME pointer in A3 | |
| 40 | add -12,sp # allow for calls to be made | |
| b920de1b | 41 | |
| 7c7fcf76 DH |
42 | # push the exception frame onto the front of the list |
| 43 | GET_THREAD_INFO a1 | |
| 44 | mov (TI_frame,a1),a0 | |
| 45 | mov a0,(REG_NEXT,fp) | |
| 46 | mov fp,(TI_frame,a1) | |
| 47 | ||
| 48 | # disable the FPU inside the kernel | |
| 49 | and ~EPSW_FE,epsw | |
| b920de1b DH |
50 | |
| 51 | # we may be holding current in E2 | |
| 52 | #ifdef CONFIG_MN10300_CURRENT_IN_E2 | |
| 53 | mov (__current),e2 | |
| 54 | #endif | |
| 55 | .endm | |
| 56 | ||
| 57 | ############################################################################### | |
| 58 | # | |
| 59 | # restore the registers from a stack frame | |
| 60 | # | |
| 61 | ############################################################################### | |
| 62 | .macro RESTORE_ALL | |
| 63 | # peel back the stack to the calling frame | |
| 64 | # - this permits execve() to discard extra frames due to kernel syscalls | |
| 7c7fcf76 DH |
65 | GET_THREAD_INFO a0 |
| 66 | mov (TI_frame,a0),fp | |
| b920de1b | 67 | mov fp,sp |
| 7c7fcf76 DH |
68 | mov (REG_NEXT,fp),d0 |
| 69 | mov d0,(TI_frame,a0) # userspace has regs->next == 0 | |
| b920de1b DH |
70 | |
| 71 | #ifndef CONFIG_MN10300_USING_JTAG | |
| 72 | mov (REG_EPSW,fp),d0 | |
| 73 | btst EPSW_T,d0 | |
| 74 | beq 99f | |
| 75 | ||
| 76 | or EPSW_NMID,epsw | |
| 77 | movhu (DCR),d1 | |
| 78 | or 0x0001, d1 | |
| 79 | movhu d1,(DCR) | |
| 80 | ||
| 81 | 99: | |
| 82 | #endif | |
| 83 | movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother] | |
| 84 | ||
| 85 | # must restore usp even if returning to kernel space, | |
| 86 | # when CONFIG_PREEMPT is enabled. | |
| 87 | mov (sp),a1 # USP in MOVM[other] dummy slot | |
| 88 | mov a1,usp | |
| 89 | ||
| 90 | movm (sp),[other] | |
| 91 | add 8,sp | |
| 92 | rti | |
| 93 | ||
| 94 | .endm | |
| 95 | ||
| 96 | ||
| 97 | #endif /* _ASM_FRAME_INC */ |