52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2001 Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto
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* Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org>
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*/
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#ifndef _ASM_M32R_SWITCH_TO_H
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#define _ASM_M32R_SWITCH_TO_H
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/*
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* switch_to(prev, next) should switch from task `prev' to `next'
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* `prev' will never be the same as `next'.
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*
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* `next' and `prev' should be struct task_struct, but it isn't always defined
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*/
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#if defined(CONFIG_FRAME_POINTER) || \
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!defined(CONFIG_SCHED_OMIT_FRAME_POINTER)
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#define M32R_PUSH_FP " push fp\n"
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#define M32R_POP_FP " pop fp\n"
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#else
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#define M32R_PUSH_FP ""
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#define M32R_POP_FP ""
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#endif
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#define switch_to(prev, next, last) do { \
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__asm__ __volatile__ ( \
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" seth lr, #high(1f) \n" \
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" or3 lr, lr, #low(1f) \n" \
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" st lr, @%4 ; store old LR \n" \
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" ld lr, @%5 ; load new LR \n" \
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M32R_PUSH_FP \
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" st sp, @%2 ; store old SP \n" \
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" ld sp, @%3 ; load new SP \n" \
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" push %1 ; store `prev' on new stack \n" \
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" jmp lr \n" \
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" .fillinsn \n" \
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"1: \n" \
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" pop %0 ; restore `__last' from new stack \n" \
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M32R_POP_FP \
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: "=r" (last) \
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: "0" (prev), \
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"r" (&(prev->thread.sp)), "r" (&(next->thread.sp)), \
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"r" (&(prev->thread.lr)), "r" (&(next->thread.lr)) \
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: "memory", "lr" \
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); \
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} while(0)
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#endif /* _ASM_M32R_SWITCH_TO_H */
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