c578455a3e
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>
30 lines
903 B
C
30 lines
903 B
C
/*
|
|
* Copyright (C) 2004 Fujitsu Siemens Computers GmbH
|
|
* Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#ifndef __FAULTINFO_I386_H
|
|
#define __FAULTINFO_I386_H
|
|
|
|
/* this structure contains the full arch-specific faultinfo
|
|
* from the traps.
|
|
* On i386, ptrace_faultinfo unfortunately doesn't provide
|
|
* all the info, since trap_no is missing.
|
|
* All common elements are defined at the same position in
|
|
* both structures, thus making it easy to copy the
|
|
* contents without knowledge about the structure elements.
|
|
*/
|
|
struct faultinfo {
|
|
int error_code; /* in ptrace_faultinfo misleadingly called is_write */
|
|
unsigned long cr2; /* in ptrace_faultinfo called addr */
|
|
int trap_no; /* missing in ptrace_faultinfo */
|
|
};
|
|
|
|
#define FAULT_WRITE(fi) ((fi).error_code & 2)
|
|
#define FAULT_ADDRESS(fi) ((fi).cr2)
|
|
|
|
#define PTRACE_FULL_FAULTINFO 0
|
|
|
|
#endif
|