diff options
Diffstat (limited to 'arch/mn10300/kernel/switch_to.S')
| -rw-r--r-- | arch/mn10300/kernel/switch_to.S | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/arch/mn10300/kernel/switch_to.S b/arch/mn10300/kernel/switch_to.S deleted file mode 100644 index de3e74fc9ea0..000000000000 --- a/arch/mn10300/kernel/switch_to.S +++ /dev/null @@ -1,179 +0,0 @@ -############################################################################### -# -# MN10300 Context switch operation -# -# Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. -# Written by David Howells (dhowells@redhat.com) -# -# This program is free software; you can redistribute it and/or -# modify it under the terms of the GNU General Public Licence -# as published by the Free Software Foundation; either version -# 2 of the Licence, or (at your option) any later version. -# -############################################################################### -#include <linux/sys.h> -#include <linux/linkage.h> -#include <asm/thread_info.h> -#include <asm/cpu-regs.h> -#ifdef CONFIG_SMP -#include <proc/smp-regs.h> -#endif /* CONFIG_SMP */ - - .text - -############################################################################### -# -# struct task_struct *__switch_to(struct thread_struct *prev, -# struct thread_struct *next, -# struct task_struct *prev_task) -# -############################################################################### -ENTRY(__switch_to) - movm [d2,d3,a2,a3,exreg1],(sp) - or EPSW_NMID,epsw - - mov (44,sp),d2 - - mov d0,a0 - mov d1,a1 - - # save prev context - mov __switch_back,d0 - mov sp,a2 - mov a2,(THREAD_SP,a0) - mov a3,(THREAD_A3,a0) - -#ifdef CONFIG_KGDB - btst 0xff,(kgdb_single_step) - bne __switch_to__lift_sstep_bp -__switch_to__continue: -#endif - mov d0,(THREAD_PC,a0) - - mov (THREAD_A3,a1),a3 - mov (THREAD_SP,a1),a2 - - # switch - mov a2,sp - - # load next context - GET_THREAD_INFO a2 - mov a2,(__current_ti) - mov (TI_task,a2),a2 - mov a2,(__current) -#ifdef CONFIG_MN10300_CURRENT_IN_E2 - mov a2,e2 -#endif - - mov (THREAD_PC,a1),a2 - mov d2,d0 # for ret_from_fork - mov d0,a0 # for __switch_to - - jmp (a2) - -__switch_back: - and ~EPSW_NMID,epsw - ret [d2,d3,a2,a3,exreg1],32 - -#ifdef CONFIG_KGDB -############################################################################### -# -# Lift the single-step breakpoints when the task being traced is switched out -# A0 = prev -# A1 = next -# -############################################################################### -__switch_to__lift_sstep_bp: - add -12,sp - mov a0,e4 - mov a1,e5 - - # Clear the single-step flag to prevent us coming this way until we get - # switched back in - bclr 0xff,(kgdb_single_step) - - # Remove first breakpoint - mov (kgdb_sstep_bp_addr),a2 - cmp 0,a2 - beq 1f - movbu (kgdb_sstep_bp),d0 - movbu d0,(a2) -#if defined(CONFIG_MN10300_CACHE_FLUSH_ICACHE) || defined(CONFIG_MN10300_CACHE_INV_ICACHE) - mov a2,d0 - mov a2,d1 - add 1,d1 - calls flush_icache_range -#endif -1: - - # Remove second breakpoint - mov (kgdb_sstep_bp_addr+4),a2 - cmp 0,a2 - beq 2f - movbu (kgdb_sstep_bp+1),d0 - movbu d0,(a2) -#if defined(CONFIG_MN10300_CACHE_FLUSH_ICACHE) || defined(CONFIG_MN10300_CACHE_INV_ICACHE) - mov a2,d0 - mov a2,d1 - add 1,d1 - calls flush_icache_range -#endif -2: - - # Change the resumption address and return - mov __switch_back__reinstall_sstep_bp,d0 - mov e4,a0 - mov e5,a1 - add 12,sp - bra __switch_to__continue - -############################################################################### -# -# Reinstall the single-step breakpoints when the task being traced is switched -# back in (A1 points to the new thread_struct). -# -############################################################################### -__switch_back__reinstall_sstep_bp: - add -12,sp - mov a0,e4 # save the return value - mov 0xff,d3 - - # Reinstall first breakpoint - mov (kgdb_sstep_bp_addr),a2 - cmp 0,a2 - beq 1f - movbu (a2),d0 - movbu d0,(kgdb_sstep_bp) - movbu d3,(a2) -#if defined(CONFIG_MN10300_CACHE_FLUSH_ICACHE) || defined(CONFIG_MN10300_CACHE_INV_ICACHE) - mov a2,d0 - mov a2,d1 - add 1,d1 - calls flush_icache_range -#endif -1: - - # Reinstall second breakpoint - mov (kgdb_sstep_bp_addr+4),a2 - cmp 0,a2 - beq 2f - movbu (a2),d0 - movbu d0,(kgdb_sstep_bp+1) - movbu d3,(a2) -#if defined(CONFIG_MN10300_CACHE_FLUSH_ICACHE) || defined(CONFIG_MN10300_CACHE_INV_ICACHE) - mov a2,d0 - mov a2,d1 - add 1,d1 - calls flush_icache_range -#endif -2: - - mov d3,(kgdb_single_step) - - # Restore the return value (the previous thread_struct pointer) - mov e4,a0 - mov a0,d0 - add 12,sp - bra __switch_back - -#endif /* CONFIG_KGDB */ |