2007-05-06 14:51:00 -07:00
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/*
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2005-04-16 15:20:36 -07:00
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdio.h>
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2006-12-06 21:34:52 -07:00
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#include <stddef.h>
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2005-04-16 15:20:36 -07:00
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#include <errno.h>
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#include <unistd.h>
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#include "ptrace_user.h"
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/* Grr, asm/user.h includes asm/ptrace.h, so has to follow ptrace_user.h */
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#include <asm/user.h>
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#include "kern_util.h"
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#include "user.h"
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#include "os.h"
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[PATCH] uml: clean arch_switch usage
Call arch_switch also in switch_to_skas, even if it's, for now, a no-op for
that case (and mark this in the comment); this will change soon.
Also, arch_switch for TT mode is actually useless when the PT proxy (a
complicate debugging instrumentation for TT mode) is not enabled. In fact, it
only calls update_debugregs, which checks debugregs_seq against seq (to check
if the registers are up-to-date - seq here means a "version number" of the
registers).
If the ptrace proxy is not enabled, debugregs_seq always stays 0 and
update_debugregs will be a no-op. So, optimize this out (the compiler can't
do it).
Also, I've been disappointed by the fact that it would make a lot of sense if,
after calling a successful
update_debugregs(current->thread.arch.debugregs_seq),
current->thread.arch.debugregs_seq were updated with the new debugregs_seq.
But this is not done. Is this a bug or a feature? For all purposes, it seems
a bug (otherwise the whole mechanism does not make sense, which is also a
possibility to check), which causes some performance only problems (not
correctness), since we write_debugregs when not needed.
Also, as suggested by Jeff, remove a redundant enabling of SIGVTALRM,
comprised in the subsequent local_irq_enable(). I'm just a bit dubious if
ordering matters there...
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>
2006-03-31 03:30:21 -07:00
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#include "uml-config.h"
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2005-04-16 15:20:36 -07:00
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int ptrace_getregs(long pid, unsigned long *regs_out)
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{
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if (ptrace(PTRACE_GETREGS, pid, 0, regs_out) < 0)
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return -errno;
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return 0;
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}
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int ptrace_setregs(long pid, unsigned long *regs)
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{
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if (ptrace(PTRACE_SETREGS, pid, 0, regs) < 0)
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return -errno;
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return 0;
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}
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int ptrace_getfpregs(long pid, unsigned long *regs)
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{
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if (ptrace(PTRACE_GETFPREGS, pid, 0, regs) < 0)
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return -errno;
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return 0;
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}
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int ptrace_setfpregs(long pid, unsigned long *regs)
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{
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if (ptrace(PTRACE_SETFPREGS, pid, 0, regs) < 0)
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return -errno;
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return 0;
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}
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