2007-10-16 01:27:08 -07:00
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/*
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2007-10-16 01:26:56 -07:00
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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2005-04-16 15:20:36 -07:00
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* Licensed under the GPL
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*/
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#ifndef __SYSDEP_I386_PTRACE_H
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#define __SYSDEP_I386_PTRACE_H
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2012-05-20 00:05:58 -04:00
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#define MAX_FP_NR HOST_FPX_SIZE
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2005-04-16 15:20:36 -07:00
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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 02:30:21 -08:00
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static inline void update_debugregs(int seq) {}
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2005-04-16 15:20:36 -07:00
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/* syscall emulation path in ptrace */
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#ifndef PTRACE_SYSEMU
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#define PTRACE_SYSEMU 31
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#endif
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void set_using_sysemu(int value);
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int get_using_sysemu(void);
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extern int sysemu_supported;
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#ifndef PTRACE_SYSEMU_SINGLESTEP
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#define PTRACE_SYSEMU_SINGLESTEP 32
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#endif
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2012-05-20 00:05:58 -04:00
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#define UPT_SYSCALL_ARG1(r) UPT_BX(r)
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#define UPT_SYSCALL_ARG2(r) UPT_CX(r)
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#define UPT_SYSCALL_ARG3(r) UPT_DX(r)
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#define UPT_SYSCALL_ARG4(r) UPT_SI(r)
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#define UPT_SYSCALL_ARG5(r) UPT_DI(r)
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#define UPT_SYSCALL_ARG6(r) UPT_BP(r)
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2005-04-16 15:20:36 -07:00
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2007-10-16 01:27:15 -07:00
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extern void arch_init_registers(int pid);
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2005-04-16 15:20:36 -07:00
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#endif
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