[PATCH] uml: S390 preparation, abstract host page fault data
authorBodo Stroesser <bstroesser@fujitsu-siemens.com>
Thu, 5 May 2005 23:15:31 +0000 (16:15 -0700)
committerLinus Torvalds <torvalds@ppc970.osdl.org>
Thu, 5 May 2005 23:36:36 +0000 (16:36 -0700)
commitc578455a3eccf4dd7bd111e77129c301d6d67914
treeb52def020bd10e1b8bffcf90e1e2a3c1b35010c8
parentea66e8a3b6c4760e8fbf59b1becb6bd8e3dd5376
[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>
24 files changed:
arch/um/include/kern_util.h
arch/um/include/sysdep-i386/faultinfo.h [new file with mode: 0644]
arch/um/include/sysdep-i386/ptrace.h
arch/um/include/sysdep-i386/sigcontext.h
arch/um/include/sysdep-i386/skas_ptrace.h [new file with mode: 0644]
arch/um/include/sysdep-ia64/skas_ptrace.h [new file with mode: 0644]
arch/um/include/sysdep-ppc/skas_ptrace.h [new file with mode: 0644]
arch/um/include/sysdep-x86_64/faultinfo.h [new file with mode: 0644]
arch/um/include/sysdep-x86_64/ptrace.h
arch/um/include/sysdep-x86_64/sigcontext.h
arch/um/include/sysdep-x86_64/skas_ptrace.h [new file with mode: 0644]
arch/um/kernel/ptrace.c
arch/um/kernel/skas/include/skas.h
arch/um/kernel/skas/process.c
arch/um/kernel/skas/trap_user.c
arch/um/kernel/trap_kern.c
arch/um/kernel/trap_user.c
arch/um/kernel/tt/tracer.c
arch/um/kernel/tt/trap_user.c
arch/um/sys-i386/signal.c
arch/um/sys-x86_64/signal.c
include/asm-um/processor-generic.h
include/asm-um/processor-i386.h
include/asm-um/processor-x86_64.h