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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>
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
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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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#ifndef __UM_PROCESSOR_I386_H
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#define __UM_PROCESSOR_I386_H
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extern int host_has_xmm;
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extern int host_has_cmov;
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/* include faultinfo structure */
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#include "sysdep/faultinfo.h"
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struct arch_thread {
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unsigned long debugregs[8];
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int debugregs_seq;
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struct faultinfo faultinfo;
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};
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#define INIT_ARCH_THREAD { .debugregs = { [ 0 ... 7 ] = 0 }, \
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.debugregs_seq = 0, \
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.faultinfo = { 0, 0, 0 } }
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#include "asm/arch/user.h"
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/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
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static inline void rep_nop(void)
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{
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__asm__ __volatile__("rep;nop": : :"memory");
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}
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#define cpu_relax() rep_nop()
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/*
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* Default implementation of macro that returns current
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* instruction pointer ("program counter"). Stolen
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* from asm-i386/processor.h
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*/
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#define current_text_addr() \
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({ void *pc; __asm__("movl $1f,%0\n1:":"=g" (pc)); pc; })
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#define ARCH_IS_STACKGROW(address) \
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(address + 32 >= UPT_SP(¤t->thread.regs.regs))
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#include "asm/processor-generic.h"
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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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