forked from luck/tmp_suning_uos_patched
55ccf3fe3f
Historical prepare_to_copy() is mostly a no-op, duplicated for majority of the architectures and the rest following the x86 model of flushing the extended register state like fpu there. Remove it and use the arch_dup_task_struct() instead. Suggested-by: Oleg Nesterov <oleg@redhat.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Link: http://lkml.kernel.org/r/1336692811-30576-1-git-send-email-suresh.b.siddha@intel.com Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: David Howells <dhowells@redhat.com> Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Chris Zankel <chris@zankel.net> Cc: Richard Henderson <rth@twiddle.net> Cc: Russell King <linux@arm.linux.org.uk> Cc: Haavard Skinnemoen <hskinnemoen@gmail.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Mark Salter <msalter@redhat.com> Cc: Aurelien Jacquiot <a-jacquiot@ti.com> Cc: Mikael Starvik <starvik@axis.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Richard Kuo <rkuo@codeaurora.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Jonas Bonn <jonas@southpole.se> Cc: James E.J. Bottomley <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Chen Liqin <liqin.chen@sunplusct.com> Cc: Lennox Wu <lennox.wu@gmail.com> Cc: David S. Miller <davem@davemloft.net> Cc: Chris Metcalf <cmetcalf@tilera.com> Cc: Jeff Dike <jdike@addtoit.com> Cc: Richard Weinberger <richard@nod.at> Cc: Guan Xuetao <gxt@mprc.pku.edu.cn> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
183 lines
4.4 KiB
C
183 lines
4.4 KiB
C
/*
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* include/asm-m68k/processor.h
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*
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* Copyright (C) 1995 Hamish Macdonald
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*/
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#ifndef __ASM_M68K_PROCESSOR_H
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#define __ASM_M68K_PROCESSOR_H
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter").
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*/
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#define current_text_addr() ({ __label__ _l; _l: &&_l;})
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#include <linux/thread_info.h>
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#include <asm/segment.h>
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#include <asm/fpu.h>
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#include <asm/ptrace.h>
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static inline unsigned long rdusp(void)
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{
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#ifdef CONFIG_COLDFIRE_SW_A7
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extern unsigned int sw_usp;
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return sw_usp;
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#else
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register unsigned long usp __asm__("a0");
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/* move %usp,%a0 */
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__asm__ __volatile__(".word 0x4e68" : "=a" (usp));
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return usp;
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#endif
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}
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static inline void wrusp(unsigned long usp)
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{
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#ifdef CONFIG_COLDFIRE_SW_A7
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extern unsigned int sw_usp;
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sw_usp = usp;
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#else
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register unsigned long a0 __asm__("a0") = usp;
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/* move %a0,%usp */
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__asm__ __volatile__(".word 0x4e60" : : "a" (a0) );
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#endif
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}
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/*
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* User space process size: 3.75GB. This is hardcoded into a few places,
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* so don't change it unless you know what you are doing.
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*/
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#ifdef CONFIG_MMU
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#if defined(CONFIG_COLDFIRE)
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#define TASK_SIZE (0xC0000000UL)
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#elif defined(CONFIG_SUN3)
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#define TASK_SIZE (0x0E000000UL)
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#else
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#define TASK_SIZE (0xF0000000UL)
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#endif
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#else
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#define TASK_SIZE (0xFFFFFFFFUL)
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#endif
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#ifdef __KERNEL__
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#define STACK_TOP TASK_SIZE
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#define STACK_TOP_MAX STACK_TOP
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#endif
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/* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#ifdef CONFIG_MMU
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#if defined(CONFIG_COLDFIRE)
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#define TASK_UNMAPPED_BASE 0x60000000UL
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#elif defined(CONFIG_SUN3)
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#define TASK_UNMAPPED_BASE 0x0A000000UL
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#else
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#define TASK_UNMAPPED_BASE 0xC0000000UL
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#endif
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#define TASK_UNMAPPED_ALIGN(addr, off) PAGE_ALIGN(addr)
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#else
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#define TASK_UNMAPPED_BASE 0
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#endif
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struct thread_struct {
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unsigned long ksp; /* kernel stack pointer */
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unsigned long usp; /* user stack pointer */
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unsigned short sr; /* saved status register */
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unsigned short fs; /* saved fs (sfc, dfc) */
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unsigned long crp[2]; /* cpu root pointer */
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unsigned long esp0; /* points to SR of stack frame */
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unsigned long faddr; /* info about last fault */
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int signo, code;
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unsigned long fp[8*3];
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unsigned long fpcntl[3]; /* fp control regs */
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unsigned char fpstate[FPSTATESIZE]; /* floating point state */
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};
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#define INIT_THREAD { \
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.ksp = sizeof(init_stack) + (unsigned long) init_stack, \
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.sr = PS_S, \
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.fs = __KERNEL_DS, \
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}
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#ifdef CONFIG_MMU
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/*
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* Do necessary setup to start up a newly executed thread.
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*/
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static inline void start_thread(struct pt_regs * regs, unsigned long pc,
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unsigned long usp)
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{
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regs->pc = pc;
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regs->sr &= ~0x2000;
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wrusp(usp);
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}
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extern int handle_kernel_fault(struct pt_regs *regs);
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#else
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/*
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* Coldfire stacks need to be re-aligned on trap exit, conventional
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* 68k can handle this case cleanly.
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*/
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#ifdef CONFIG_COLDFIRE
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#define reformat(_regs) do { (_regs)->format = 0x4; } while(0)
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#else
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#define reformat(_regs) do { } while (0)
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#endif
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#define start_thread(_regs, _pc, _usp) \
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do { \
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(_regs)->pc = (_pc); \
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((struct switch_stack *)(_regs))[-1].a6 = 0; \
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reformat(_regs); \
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if (current->mm) \
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(_regs)->d5 = current->mm->start_data; \
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(_regs)->sr &= ~0x2000; \
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wrusp(_usp); \
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} while(0)
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static inline int handle_kernel_fault(struct pt_regs *regs)
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{
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/* Any fault in kernel is fatal on non-mmu */
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return 0;
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}
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#endif
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/* Forward declaration, a strange C thing */
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struct task_struct;
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/* Free all resources held by a thread. */
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static inline void release_thread(struct task_struct *dead_task)
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{
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}
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extern int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags);
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/*
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* Free current thread data structures etc..
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*/
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static inline void exit_thread(void)
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{
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}
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extern unsigned long thread_saved_pc(struct task_struct *tsk);
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unsigned long get_wchan(struct task_struct *p);
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#define KSTK_EIP(tsk) \
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({ \
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unsigned long eip = 0; \
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if ((tsk)->thread.esp0 > PAGE_SIZE && \
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(virt_addr_valid((tsk)->thread.esp0))) \
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eip = ((struct pt_regs *) (tsk)->thread.esp0)->pc; \
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eip; })
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#define KSTK_ESP(tsk) ((tsk) == current ? rdusp() : (tsk)->thread.usp)
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#define task_pt_regs(tsk) ((struct pt_regs *) ((tsk)->thread.esp0))
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#define cpu_relax() barrier()
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#endif
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