aa6758d486
Implement sys_[gs]et_thread_area and the corresponding ptrace operations for UML. This is the main chunk, additional parts follow. This implementation is now well tested and has run reliably for some time, and we've understood all the previously existing problems. Their implementation saves the new GDT content and then forwards the call to the host when appropriate, i.e. immediately when the target process is running or on context switch otherwise (i.e. on fork and on ptrace() calls). In SKAS mode, we must switch registers on each context switch (because SKAS does not switches tls_array together with current->mm). Also, added get_cpu() locking; this has been done for SKAS mode, since TT does not need it (it does not use smp_processor_id()). Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/*
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* Copyright 2003 PathScale, Inc.
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*
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* Licensed under the GPL
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*/
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#ifndef __UM_PROCESSOR_X86_64_H
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#define __UM_PROCESSOR_X86_64_H
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/* include faultinfo structure */
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#include "sysdep/faultinfo.h"
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struct arch_thread {
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unsigned long debugregs[8];
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int debugregs_seq;
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struct faultinfo faultinfo;
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};
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/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
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extern inline void rep_nop(void)
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{
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__asm__ __volatile__("rep;nop": : :"memory");
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}
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#define cpu_relax() rep_nop()
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#define INIT_ARCH_THREAD { .debugregs = { [ 0 ... 7 ] = 0 }, \
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.debugregs_seq = 0, \
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.faultinfo = { 0, 0, 0 } }
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static inline void arch_flush_thread(struct arch_thread *thread)
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{
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}
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static inline void arch_copy_thread(struct arch_thread *from,
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struct arch_thread *to)
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{
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}
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#include "asm/arch/user.h"
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#define current_text_addr() \
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({ void *pc; __asm__("movq $1f,%0\n1:":"=g" (pc)); pc; })
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#define ARCH_IS_STACKGROW(address) \
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(address + 128 >= UPT_SP(¤t->thread.regs.regs))
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#define KSTK_EIP(tsk) KSTK_REG(tsk, RIP)
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#define KSTK_ESP(tsk) KSTK_REG(tsk, RSP)
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#include "asm/processor-generic.h"
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#endif
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