2006-03-31 18:30:22 +08:00
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/*
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2005-04-17 06:20:36 +08:00
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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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2011-08-19 03:02:59 +08:00
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#include <linux/string.h>
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#include <asm/segment.h>
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2011-08-19 03:10:49 +08:00
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#include <asm/ldt.h>
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2006-03-31 18:30:22 +08:00
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2005-04-17 06:20:36 +08:00
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extern int host_has_cmov;
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2006-03-31 18:30:22 +08:00
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struct uml_tls_struct {
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struct user_desc tls;
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unsigned flushed:1;
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unsigned present:1;
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};
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2005-04-17 06:20:36 +08:00
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struct arch_thread {
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2006-03-31 18:30:22 +08:00
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struct uml_tls_struct tls_array[GDT_ENTRY_TLS_ENTRIES];
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2005-04-17 06:20:36 +08:00
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unsigned long debugregs[8];
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int debugregs_seq;
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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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struct faultinfo faultinfo;
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2005-04-17 06:20:36 +08:00
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};
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2006-03-31 18:30:22 +08:00
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#define INIT_ARCH_THREAD { \
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.tls_array = { [ 0 ... GDT_ENTRY_TLS_ENTRIES - 1 ] = \
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{ .present = 0, .flushed = 0 } }, \
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.debugregs = { [ 0 ... 7 ] = 0 }, \
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.debugregs_seq = 0, \
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.faultinfo = { 0, 0, 0 } \
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}
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2013-09-23 23:38:01 +08:00
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#define STACKSLOTS_PER_LINE 8
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2006-03-31 18:30:22 +08:00
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static inline void arch_flush_thread(struct arch_thread *thread)
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{
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/* Clear any TLS still hanging */
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memset(&thread->tls_array, 0, sizeof(thread->tls_array));
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}
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static inline void arch_copy_thread(struct arch_thread *from,
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struct arch_thread *to)
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{
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memcpy(&to->tls_array, &from->tls_array, sizeof(from->tls_array));
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}
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2005-04-17 06:20:36 +08:00
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2013-09-23 23:38:01 +08:00
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#define current_sp() ({ void *sp; __asm__("movl %%esp, %0" : "=r" (sp) : ); sp; })
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#define current_bp() ({ unsigned long bp; __asm__("movl %%ebp, %0" : "=r" (bp) : ); bp; })
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2005-04-17 06:20:36 +08:00
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#endif
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