2005-04-16 16:20:36 -06:00
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/*
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2007-10-16 02:26:54 -06:00
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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2005-04-16 16:20:36 -06:00
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* Licensed under the GPL
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*/
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#ifndef __SYS_SIGCONTEXT_I386_H
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#define __SYS_SIGCONTEXT_I386_H
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2007-10-16 02:26:54 -06:00
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#include "sysdep/sc.h"
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2005-04-16 16:20:36 -06:00
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#define IP_RESTART_SYSCALL(ip) ((ip) -= 2)
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2008-05-12 15:01:48 -06:00
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#define GET_FAULTINFO_FROM_SC(fi, sc) \
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[PATCH] uml: S390 preparation, abstract host page fault data
This patch removes the arch-specific fault/trap-infos from thread and
skas-regs.
It adds a new struct faultinfo, that is arch-specific defined in
sysdep/faultinfo.h.
The structure is inserted in thread.arch and thread.regs.skas and
thread.regs.tt
Now, segv and other trap-handlers can copy the contents from regs.X.faultinfo
to thread.arch.faultinfo with one simple assignment.
Also, the number of macros necessary is reduced to
FAULT_ADDRESS(struct faultinfo)
extracts the faulting address from faultinfo
FAULT_WRITE(struct faultinfo)
extracts the "is_write" flag
SEGV_IS_FIXABLE(struct faultinfo)
is true for the fixable segvs, i.e. (TRAP == 14)
on i386
UPT_FAULTINFO(regs)
result is (struct faultinfo *) to the faultinfo
in regs->skas.faultinfo
GET_FAULTINFO_FROM_SC(struct faultinfo, struct sigcontext *)
copies the relevant parts of the sigcontext to
struct faultinfo.
On SIGSEGV, call user_signal() instead of handle_segv(), if the architecture
provides the information needed in PTRACE_FAULTINFO, or if PTRACE_FAULTINFO is
missing, because segv-stub will provide the info.
The benefit of the change is, that in case of a non-fixable SIGSEGV, we can
give user processes a SIGSEGV, instead of possibly looping on pagefault
handling.
Since handle_segv() sikked arch_fixup() implicitly by passing ip==0 to segv(),
I changed segv() to call arch_fixup() only, if !is_user.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-05 17:15:31 -06:00
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{ \
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(fi).cr2 = SC_CR2(sc); \
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(fi).error_code = SC_ERR(sc); \
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(fi).trap_no = SC_TRAPNO(sc); \
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}
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2005-04-16 16:20:36 -06:00
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/* This is Page Fault */
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2005-09-30 12:58:59 -06:00
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#define SEGV_IS_FIXABLE(fi) ((fi)->trap_no == 14)
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/* SKAS3 has no trap_no on i386, but get_skas_faultinfo() sets it to 0. */
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#define SEGV_MAYBE_FIXABLE(fi) ((fi)->trap_no == 0 && ptrace_faultinfo)
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2005-04-16 16:20:36 -06:00
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#endif
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