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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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92 lines
2.2 KiB
PHP
92 lines
2.2 KiB
PHP
/* MN10300 Microcontroller core system register definitions -*- asm -*-
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*
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* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public Licence
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* as published by the Free Software Foundation; either version
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* 2 of the Licence, or (at your option) any later version.
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*/
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#ifndef _ASM_FRAME_INC
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#define _ASM_FRAME_INC
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#ifndef __ASSEMBLY__
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#error not for use in C files
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#endif
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#ifndef __ASM_OFFSETS_H__
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#include <asm/asm-offsets.h>
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#endif
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#define pi break
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#define fp a3
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###############################################################################
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#
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# build a stack frame from the registers
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# - the caller has subtracted 4 from SP before coming here
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#
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###############################################################################
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.macro SAVE_ALL
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add -4,sp # next exception frame ptr save area
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movm [other],(sp)
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mov usp,a1
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mov a1,(sp) # USP in MOVM[other] dummy slot
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movm [d2,d3,a2,a3,exreg0,exreg1,exother],(sp)
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mov sp,fp # FRAME pointer in A3
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add -12,sp # allow for calls to be made
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mov (__frame),a1
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mov a1,(REG_NEXT,fp)
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mov fp,(__frame)
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and ~EPSW_FE,epsw # disable the FPU inside the kernel
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# we may be holding current in E2
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#ifdef CONFIG_MN10300_CURRENT_IN_E2
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mov (__current),e2
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#endif
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.endm
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###############################################################################
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#
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# restore the registers from a stack frame
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#
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###############################################################################
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.macro RESTORE_ALL
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# peel back the stack to the calling frame
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# - this permits execve() to discard extra frames due to kernel syscalls
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mov (__frame),fp
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mov fp,sp
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mov (REG_NEXT,fp),d0 # userspace has regs->next == 0
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mov d0,(__frame)
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#ifndef CONFIG_MN10300_USING_JTAG
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mov (REG_EPSW,fp),d0
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btst EPSW_T,d0
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beq 99f
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or EPSW_NMID,epsw
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movhu (DCR),d1
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or 0x0001, d1
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movhu d1,(DCR)
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99:
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#endif
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movm (sp),[d2,d3,a2,a3,exreg0,exreg1,exother]
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# must restore usp even if returning to kernel space,
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# when CONFIG_PREEMPT is enabled.
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mov (sp),a1 # USP in MOVM[other] dummy slot
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mov a1,usp
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movm (sp),[other]
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add 8,sp
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rti
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.endm
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#endif /* _ASM_FRAME_INC */
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