7c7fcf762e
Save the current exception frame pointer in the thread_info struct rather than in a global variable as the latter makes SMP tricky, especially when preemption is also enabled. This also replaces __frame with current_frame() and rearranges header file inclusions to make it all compile. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
70 lines
1.6 KiB
ArmAsm
70 lines
1.6 KiB
ArmAsm
###############################################################################
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#
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# MN10300 Context switch operation
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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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###############################################################################
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#include <linux/sys.h>
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#include <linux/linkage.h>
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#include <asm/thread_info.h>
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#include <asm/cpu-regs.h>
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#ifdef CONFIG_SMP
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#include <proc/smp-regs.h>
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#endif /* CONFIG_SMP */
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.text
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###############################################################################
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#
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# struct task_struct *__switch_to(struct thread_struct *prev,
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# struct thread_struct *next,
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# struct task_struct *prev_task)
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#
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###############################################################################
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ENTRY(__switch_to)
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movm [d2,d3,a2,a3,exreg1],(sp)
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or EPSW_NMID,epsw
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mov (44,sp),d2
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mov d0,a0
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mov d1,a1
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# save prev context
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mov __switch_back,d0
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mov d0,(THREAD_PC,a0)
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mov sp,a2
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mov a2,(THREAD_SP,a0)
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mov a3,(THREAD_A3,a0)
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mov (THREAD_A3,a1),a3
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mov (THREAD_SP,a1),a2
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# switch
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mov a2,sp
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# load next context
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GET_THREAD_INFO a2
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mov a2,(__current_ti)
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mov (TI_task,a2),a2
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mov a2,(__current)
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#ifdef CONFIG_MN10300_CURRENT_IN_E2
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mov a2,e2
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#endif
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mov (THREAD_PC,a1),a2
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mov d2,d0 # for ret_from_fork
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mov d0,a0 # for __switch_to
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jmp (a2)
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__switch_back:
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and ~EPSW_NMID,epsw
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ret [d2,d3,a2,a3,exreg1],32
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