| David Howells | b920de1 | 2008-02-08 04:19:31 -0800 | [diff] [blame] | 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 |
| 21 | |
| 22 | #define pi break |
| 23 | |
| 24 | #define fp a3 |
| 25 | |
| 26 | ############################################################################### |
| 27 | # |
| 28 | # build a stack frame from the registers |
| 29 | # - the caller has subtracted 4 from SP before coming here |
| 30 | # |
| 31 | ############################################################################### |
| 32 | .macro SAVE_ALL |
| 33 | add -4,sp # next exception frame ptr save area |
| 34 | movm [other],(sp) |
| 35 | mov usp,a1 |
| 36 | mov a1,(sp) # USP in MOVM[other] dummy slot |
| 37 | movm [d2,d3,a2,a3,exreg0,exreg1,exother],(sp) |
| 38 | mov sp,fp # FRAME pointer in A3 |
| 39 | add -12,sp # allow for calls to be made |
| 40 | mov (__frame),a1 |
| 41 | mov a1,(REG_NEXT,fp) |
| 42 | mov fp,(__frame) |
| 43 | |
| 44 | and ~EPSW_FE,epsw # disable the FPU inside the kernel |
| 45 | |
| 46 | # we may be holding current in E2 |
| 47 | #ifdef CONFIG_MN10300_CURRENT_IN_E2 |
| 48 | mov (__current),e2 |
| 49 | #endif |
| 50 | .endm |
| 51 | |
| 52 | ############################################################################### |
| 53 | # |
| 54 | # restore the registers from a stack frame |
| 55 | # |
| 56 | ############################################################################### |
| 57 | .macro RESTORE_ALL |
| 58 | # peel back the stack to the calling frame |
| 59 | # - this permits execve() to discard extra frames due to kernel syscalls |
| 60 | mov (__frame),fp |
| 61 | mov fp,sp |
| 62 | mov (REG_NEXT,fp),d0 # userspace has regs->next == 0 |
| 63 | mov d0,(__frame) |
| 64 | |
| 65 | #ifndef CONFIG_MN10300_USING_JTAG |
| 66 | mov (REG_EPSW,fp),d0 |
| 67 | btst EPSW_T,d0 |
| 68 | beq 99f |
| 69 | |
| 70 | or EPSW_NMID,epsw |
| 71 | movhu (DCR),d1 |
| 72 | or 0x0001, d1 |
| 73 | movhu d1,(DCR) |
| 74 | |
| 75 | 99: |
| 76 | #endif |
| 77 | movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother] |
| 78 | |
| 79 | # must restore usp even if returning to kernel space, |
| 80 | # when CONFIG_PREEMPT is enabled. |
| 81 | mov (sp),a1 # USP in MOVM[other] dummy slot |
| 82 | mov a1,usp |
| 83 | |
| 84 | movm (sp),[other] |
| 85 | add 8,sp |
| 86 | rti |
| 87 | |
| 88 | .endm |
| 89 | |
| 90 | |
| 91 | #endif /* _ASM_FRAME_INC */ |