2005-04-17 06:20:36 +08:00
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/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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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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2005-10-01 02:58:59 +08:00
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#include "uml-config.h"
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2005-04-17 06:20:36 +08:00
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#include <sysdep/sc.h>
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#define IP_RESTART_SYSCALL(ip) ((ip) -= 2)
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#define SC_RESTART_SYSCALL(sc) IP_RESTART_SYSCALL(SC_IP(sc))
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#define SC_SET_SYSCALL_RETURN(sc, result) SC_EAX(sc) = (result)
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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>
2005-05-06 07:15:31 +08:00
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#define GET_FAULTINFO_FROM_SC(fi,sc) \
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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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2005-04-17 06:20:36 +08:00
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/* ptrace expects that, at the start of a system call, %eax contains
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* -ENOSYS, so this makes it so.
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*/
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#define SC_START_SYSCALL(sc) do SC_EAX(sc) = -ENOSYS; while(0)
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/* This is Page Fault */
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2005-10-01 02:58:59 +08:00
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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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#ifdef UML_CONFIG_MODE_SKAS
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#define SEGV_MAYBE_FIXABLE(fi) ((fi)->trap_no == 0 && ptrace_faultinfo)
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#else
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#define SEGV_MAYBE_FIXABLE(fi) 0
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#endif
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2005-04-17 06:20:36 +08:00
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extern unsigned long *sc_sigmask(void *sc_ptr);
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extern int sc_get_fpregs(unsigned long buf, void *sc_ptr);
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#endif
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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