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authorBodo Stroesser <bstroesser@fujitsu-siemens.com>2005-05-05 16:15:31 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-05 16:36:36 -0700
commitc578455a3eccf4dd7bd111e77129c301d6d67914 (patch)
treeb52def020bd10e1b8bffcf90e1e2a3c1b35010c8 /include/asm-um
parentea66e8a3b6c4760e8fbf59b1becb6bd8e3dd5376 (diff)
downloadop-kernel-dev-c578455a3eccf4dd7bd111e77129c301d6d67914.zip
op-kernel-dev-c578455a3eccf4dd7bd111e77129c301d6d67914.tar.gz
[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>
Diffstat (limited to 'include/asm-um')
-rw-r--r--include/asm-um/processor-generic.h5
-rw-r--r--include/asm-um/processor-i386.h7
-rw-r--r--include/asm-um/processor-x86_64.h12
3 files changed, 16 insertions, 8 deletions
diff --git a/include/asm-um/processor-generic.h b/include/asm-um/processor-generic.h
index b953b1a..b2fc94f 100644
--- a/include/asm-um/processor-generic.h
+++ b/include/asm-um/processor-generic.h
@@ -24,9 +24,6 @@ struct thread_struct {
int forking;
int nsyscalls;
struct pt_regs regs;
- unsigned long cr2;
- int err;
- unsigned long trap_no;
int singlestep_syscall;
void *fault_addr;
void *fault_catcher;
@@ -74,8 +71,6 @@ struct thread_struct {
.forking = 0, \
.nsyscalls = 0, \
.regs = EMPTY_REGS, \
- .cr2 = 0, \
- .err = 0, \
.fault_addr = NULL, \
.prev_sched = NULL, \
.temp_stack = 0, \
diff --git a/include/asm-um/processor-i386.h b/include/asm-um/processor-i386.h
index 2deb8f1..431bad3 100644
--- a/include/asm-um/processor-i386.h
+++ b/include/asm-um/processor-i386.h
@@ -9,13 +9,18 @@
extern int host_has_xmm;
extern int host_has_cmov;
+/* include faultinfo structure */
+#include "sysdep/faultinfo.h"
+
struct arch_thread {
unsigned long debugregs[8];
int debugregs_seq;
+ struct faultinfo faultinfo;
};
#define INIT_ARCH_THREAD { .debugregs = { [ 0 ... 7 ] = 0 }, \
- .debugregs_seq = 0 }
+ .debugregs_seq = 0, \
+ .faultinfo = { 0, 0, 0 } }
#include "asm/arch/user.h"
diff --git a/include/asm-um/processor-x86_64.h b/include/asm-um/processor-x86_64.h
index a1ae3a4..0beb9a4 100644
--- a/include/asm-um/processor-x86_64.h
+++ b/include/asm-um/processor-x86_64.h
@@ -7,9 +7,13 @@
#ifndef __UM_PROCESSOR_X86_64_H
#define __UM_PROCESSOR_X86_64_H
-#include "asm/arch/user.h"
+/* include faultinfo structure */
+#include "sysdep/faultinfo.h"
struct arch_thread {
+ unsigned long debugregs[8];
+ int debugregs_seq;
+ struct faultinfo faultinfo;
};
/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
@@ -20,7 +24,11 @@ extern inline void rep_nop(void)
#define cpu_relax() rep_nop()
-#define INIT_ARCH_THREAD { }
+#define INIT_ARCH_THREAD { .debugregs = { [ 0 ... 7 ] = 0 }, \
+ .debugregs_seq = 0, \
+ .faultinfo = { 0, 0, 0 } }
+
+#include "asm/arch/user.h"
#define current_text_addr() \
({ void *pc; __asm__("movq $1f,%0\n1:":"=g" (pc)); pc; })
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