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um: switch stub_segv_handler to SA_SIGINFO variant, get rid of magic crap in there

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Al Viro 2011-08-18 20:04:09 +01:00 committed by Richard Weinberger
parent adcfb9852d
commit 9b25fcbdc6
7 changed files with 14 additions and 39 deletions
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4
arch/um/os-Linux/skas/process.c
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@ -255,8 +255,8 @@ static int userspace_tramp(void *stack)
set_sigstack((void *) STUB_DATA, UM_KERN_PAGE_SIZE);
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_ONSTACK | SA_NODEFER;
sa.sa_handler = (void *) v;
sa.sa_flags = SA_ONSTACK | SA_NODEFER | SA_SIGINFO;
sa.sa_sigaction = (void *) v;
sa.sa_restorer = NULL;
if (sigaction(SIGSEGV, &sa, NULL) < 0) {
printk(UM_KERN_ERR "userspace_tramp - setting SIGSEGV "

2
arch/um/sys-x86/Makefile
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@ -10,7 +10,7 @@ endif
obj-y = bug.o bugs_$(BITS).o delay_$(BITS).o fault.o ksyms.o ldt.o \
ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal_$(BITS).o \
stub_$(BITS).o stub_segv_$(BITS).o syscalls_$(BITS).o \
stub_$(BITS).o stub_segv.o syscalls_$(BITS).o \
sys_call_table_$(BITS).o sysrq_$(BITS).o tls_$(BITS).o mem_$(BITS).o
ifeq ($(CONFIG_X86_32),y)

9
arch/um/sys-x86/shared/sysdep/stub.h
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@ -1,5 +1,14 @@
#include <asm/unistd.h>
#include <sys/mman.h>
#include <signal.h>
#include "as-layout.h"
#include "stub-data.h"
#ifdef __i386__
#include "stub_32.h"
#else
#include "stub_64.h"
#endif
extern void stub_segv_handler(int, siginfo_t *, void *);
extern void stub_clone_handler(void);

7
arch/um/sys-x86/shared/sysdep/stub_32.h
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@ -6,14 +6,7 @@
#ifndef __SYSDEP_STUB_H
#define __SYSDEP_STUB_H
#include <sys/mman.h>
#include <asm/ptrace.h>
#include <asm/unistd.h>
#include "as-layout.h"
#include "stub-data.h"
extern void stub_segv_handler(int sig);
extern void stub_clone_handler(void);
#define STUB_SYSCALL_RET EAX
#define STUB_MMAP_NR __NR_mmap2

7
arch/um/sys-x86/shared/sysdep/stub_64.h
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@ -6,14 +6,7 @@
#ifndef __SYSDEP_STUB_H
#define __SYSDEP_STUB_H
#include <sys/mman.h>
#include <asm/unistd.h>
#include <sysdep/ptrace_user.h>
#include "as-layout.h"
#include "stub-data.h"
extern void stub_segv_handler(int sig);
extern void stub_clone_handler(void);
#define STUB_SYSCALL_RET PT_INDEX(RAX)
#define STUB_MMAP_NR __NR_mmap

7
arch/um/sys-x86/stub_segv_64.c → arch/um/sys-x86/stub_segv.c
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@ -3,18 +3,15 @@
* Licensed under the GPL
*/
#include <signal.h>
#include "as-layout.h"
#include "sysdep/stub.h"
#include "sysdep/faultinfo.h"
#include "sysdep/sigcontext.h"
void __attribute__ ((__section__ (".__syscall_stub")))
stub_segv_handler(int sig)
stub_segv_handler(int sig, siginfo_t *info, void *p)
{
struct ucontext *uc;
struct ucontext *uc = p;
__asm__ __volatile__("movq %%rdx, %0" : "=g" (uc) :);
GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA),
&uc->uc_mcontext);
trap_myself();

17
arch/um/sys-x86/stub_segv_32.c
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@ -1,17 +0,0 @@
/*
* Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#include "sysdep/stub.h"
#include "sysdep/sigcontext.h"
void __attribute__ ((__section__ (".__syscall_stub")))
stub_segv_handler(int sig)
{
struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA), sc);
trap_myself();
}