/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2001 Hiroyuki Kondo, Hirokazu Takata, and Hitoshi Yamamoto * Copyright (C) 2004, 2006 Hirokazu Takata <takata at linux-m32r.org> */ #ifndef _ASM_M32R_SWITCH_TO_H #define _ASM_M32R_SWITCH_TO_H /* * switch_to(prev, next) should switch from task `prev' to `next' * `prev' will never be the same as `next'. * * `next' and `prev' should be struct task_struct, but it isn't always defined */ #if defined([31mCONFIG_FRAME_POINTER[0m) || \ !defined([31mCONFIG_SCHED_OMIT_FRAME_POINTER[0m) #define M32R_PUSH_FP " push fp\n" #define M32R_POP_FP " pop fp\n" #else #define M32R_PUSH_FP "" #define M32R_POP_FP "" #endif #define switch_to(prev, next, last) do { \ __asm__ __volatile__ ( \ " seth lr, #high(1f) \n" \ " or3 lr, lr, #low(1f) \n" \ " st lr, @%4 ; store old LR \n" \ " ld lr, @%5 ; load new LR \n" \ M32R_PUSH_FP \ " st sp, @%2 ; store old SP \n" \ " ld sp, @%3 ; load new SP \n" \ " push %1 ; store `prev' on new stack \n" \ " jmp lr \n" \ " .fillinsn \n" \ "1: \n" \ " pop %0 ; restore `__last' from new stack \n" \ M32R_POP_FP \ : "=r" (last) \ : "0" (prev), \ "r" (&(prev->thread.sp)), "r" (&(next->thread.sp)), \ "r" (&(prev->thread.lr)), "r" (&(next->thread.lr)) \ : "memory", "lr" \ ); \ } while(0) #endif /* _ASM_M32R_SWITCH_TO_H */ |