1640 lines
51 KiB
C
1640 lines
51 KiB
C
/*
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* i386 signal handling routines
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*
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* Copyright 1999 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifdef __i386__
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#include "config.h"
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#include "wine/port.h"
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#include <errno.h>
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#include <signal.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_SYS_PARAM_H
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# include <sys/param.h>
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#endif
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#ifdef HAVE_SYSCALL_H
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# include <syscall.h>
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#else
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# ifdef HAVE_SYS_SYSCALL_H
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# include <sys/syscall.h>
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# endif
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#endif
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#ifdef HAVE_SYS_VM86_H
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# include <sys/vm86.h>
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#endif
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#ifdef HAVE_SYS_SIGNAL_H
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# include <sys/signal.h>
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#endif
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#include "windef.h"
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#include "thread.h"
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#include "wine/library.h"
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#include "ntdll_misc.h"
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#ifdef HAVE_VALGRIND_MEMCHECK_H
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#include <valgrind/memcheck.h>
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#endif
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/***********************************************************************
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* signal context platform-specific definitions
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*/
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#ifdef linux
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typedef struct
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{
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unsigned short sc_gs, __gsh;
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unsigned short sc_fs, __fsh;
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unsigned short sc_es, __esh;
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unsigned short sc_ds, __dsh;
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unsigned long sc_edi;
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unsigned long sc_esi;
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unsigned long sc_ebp;
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unsigned long sc_esp;
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unsigned long sc_ebx;
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unsigned long sc_edx;
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unsigned long sc_ecx;
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unsigned long sc_eax;
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unsigned long sc_trapno;
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unsigned long sc_err;
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unsigned long sc_eip;
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unsigned short sc_cs, __csh;
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unsigned long sc_eflags;
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unsigned long esp_at_signal;
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unsigned short sc_ss, __ssh;
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unsigned long i387;
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unsigned long oldmask;
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unsigned long cr2;
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} volatile SIGCONTEXT;
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#define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
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#define HANDLER_CONTEXT (&__context)
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/* this is the sigaction structure from the Linux 2.1.20 kernel. */
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struct kernel_sigaction
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{
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void (*ksa_handler)();
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unsigned long ksa_mask;
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unsigned long ksa_flags;
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void *ksa_restorer;
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};
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#ifndef SYS_sigaction
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# ifndef __NR_sigaction
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# error The sigaction syscall is part of the Linux i386 ABI, but your headers does not define it. Please raise a bug with your distribution.
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# endif
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# define SYS_sigaction __NR_sigaction
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#endif
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/* Similar to the sigaction function in libc, except it leaves alone the
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restorer field, which is used to specify the signal stack address */
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static inline int wine_sigaction( int sig, struct kernel_sigaction *new,
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struct kernel_sigaction *old )
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{
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__asm__ __volatile__( "pushl %%ebx\n\t"
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"movl %2,%%ebx\n\t"
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"int $0x80\n\t"
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"popl %%ebx"
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: "=a" (sig)
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: "0" (SYS_sigaction), "S" (sig), "c" (new), "d" (old) );
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if (sig>=0) return 0;
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errno = -sig;
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return -1;
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}
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#ifdef HAVE_SIGALTSTACK
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/* direct syscall for sigaltstack to work around glibc 2.0 brain-damage */
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static inline int wine_sigaltstack( const struct sigaltstack *new,
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struct sigaltstack *old )
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{
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int ret;
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__asm__ __volatile__( "pushl %%ebx\n\t"
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"movl %2,%%ebx\n\t"
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"int $0x80\n\t"
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"popl %%ebx"
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: "=a" (ret)
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: "0" (SYS_sigaltstack), "q" (new), "c" (old) );
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if (ret >= 0) return 0;
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errno = -ret;
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return -1;
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}
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#endif
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#define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
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int vm86_enter( void **vm86_ptr );
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void vm86_return(void);
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void vm86_return_end(void);
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__ASM_GLOBAL_FUNC(vm86_enter,
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"pushl %ebp\n\t"
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"movl %esp, %ebp\n\t"
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"movl $166,%eax\n\t" /*SYS_vm86*/
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"movl 8(%ebp),%ecx\n\t" /* vm86_ptr */
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"movl (%ecx),%ecx\n\t"
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"pushl %ebx\n\t"
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"movl $1,%ebx\n\t" /*VM86_ENTER*/
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"pushl %ecx\n\t" /* put vm86plus_struct ptr somewhere we can find it */
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"pushl %fs\n\t"
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"pushl %gs\n\t"
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"int $0x80\n"
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".globl " __ASM_NAME("vm86_return") "\n\t"
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__ASM_FUNC("vm86_return") "\n"
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__ASM_NAME("vm86_return") ":\n\t"
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"popl %gs\n\t"
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"popl %fs\n\t"
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"popl %ecx\n\t"
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"popl %ebx\n\t"
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"popl %ebp\n\t"
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"testl %eax,%eax\n\t"
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"jl 0f\n\t"
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"cmpb $0,%al\n\t" /* VM86_SIGNAL */
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"je " __ASM_NAME("vm86_enter") "\n\t"
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"0:\n\t"
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"movl 4(%esp),%ecx\n\t" /* vm86_ptr */
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"movl $0,(%ecx)\n\t"
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".globl " __ASM_NAME("vm86_return_end") "\n\t"
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__ASM_FUNC("vm86_return_end") "\n"
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__ASM_NAME("vm86_return_end") ":\n\t"
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"ret" );
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#ifdef HAVE_SYS_VM86_H
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# define __HAVE_VM86
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#endif
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#endif /* linux */
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#ifdef BSDI
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#define EAX_sig(context) ((context)->tf_eax)
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#define EBX_sig(context) ((context)->tf_ebx)
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#define ECX_sig(context) ((context)->tf_ecx)
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#define EDX_sig(context) ((context)->tf_edx)
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#define ESI_sig(context) ((context)->tf_esi)
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#define EDI_sig(context) ((context)->tf_edi)
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#define EBP_sig(context) ((context)->tf_ebp)
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#define CS_sig(context) ((context)->tf_cs)
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#define DS_sig(context) ((context)->tf_ds)
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#define ES_sig(context) ((context)->tf_es)
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#define SS_sig(context) ((context)->tf_ss)
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#include <machine/frame.h>
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typedef struct trapframe SIGCONTEXT;
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#define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
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#define HANDLER_CONTEXT __context
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#define EFL_sig(context) ((context)->tf_eflags)
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#define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
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#define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
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#endif /* bsdi */
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#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
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typedef struct sigcontext SIGCONTEXT;
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#define HANDLER_DEF(name) void name( int __signal, int code, SIGCONTEXT *__context )
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#define HANDLER_CONTEXT __context
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#endif /* *BSD */
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#if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
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#ifdef _SCO_DS
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#include <sys/regset.h>
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#endif
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/* Solaris kludge */
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#undef ERR
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#include <sys/ucontext.h>
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#undef ERR
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typedef struct ucontext SIGCONTEXT;
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#define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
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#define HANDLER_CONTEXT __context
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#endif /* svr4 || SCO_DS */
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#ifdef __EMX__
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typedef struct
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{
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unsigned long ContextFlags;
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FLOATING_SAVE_AREA sc_float;
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unsigned long sc_gs;
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unsigned long sc_fs;
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unsigned long sc_es;
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unsigned long sc_ds;
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unsigned long sc_edi;
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unsigned long sc_esi;
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unsigned long sc_eax;
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unsigned long sc_ebx;
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unsigned long sc_ecx;
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unsigned long sc_edx;
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unsigned long sc_ebp;
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unsigned long sc_eip;
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unsigned long sc_cs;
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unsigned long sc_eflags;
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unsigned long sc_esp;
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unsigned long sc_ss;
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} SIGCONTEXT;
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#endif /* __EMX__ */
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#ifdef __CYGWIN__
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/* FIXME: This section is just here so it can compile, it's most likely
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* completely wrong. */
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typedef struct
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{
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unsigned short sc_gs, __gsh;
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unsigned short sc_fs, __fsh;
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unsigned short sc_es, __esh;
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unsigned short sc_ds, __dsh;
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unsigned long sc_edi;
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unsigned long sc_esi;
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unsigned long sc_ebp;
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unsigned long sc_esp;
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unsigned long sc_ebx;
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unsigned long sc_edx;
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unsigned long sc_ecx;
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unsigned long sc_eax;
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unsigned long sc_trapno;
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unsigned long sc_err;
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unsigned long sc_eip;
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unsigned short sc_cs, __csh;
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unsigned long sc_eflags;
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unsigned long esp_at_signal;
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unsigned short sc_ss, __ssh;
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unsigned long i387;
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unsigned long oldmask;
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unsigned long cr2;
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} SIGCONTEXT;
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#define HANDLER_DEF(name) void name( int __signal, SIGCONTEXT __context )
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#define HANDLER_CONTEXT (&__context)
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#endif /* __CYGWIN__ */
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#ifdef __APPLE__
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# include <sys/ucontext.h>
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# include <sys/types.h>
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# include <signal.h>
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typedef ucontext_t SIGCONTEXT;
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#define EAX_sig(context) ((context)->uc_mcontext->ss.eax)
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#define EBX_sig(context) ((context)->uc_mcontext->ss.ebx)
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#define ECX_sig(context) ((context)->uc_mcontext->ss.ecx)
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#define EDX_sig(context) ((context)->uc_mcontext->ss.edx)
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#define ESI_sig(context) ((context)->uc_mcontext->ss.esi)
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#define EDI_sig(context) ((context)->uc_mcontext->ss.edi)
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#define EBP_sig(context) ((context)->uc_mcontext->ss.ebp)
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#define CS_sig(context) ((context)->uc_mcontext->ss.cs)
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#define DS_sig(context) ((context)->uc_mcontext->ss.ds)
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#define ES_sig(context) ((context)->uc_mcontext->ss.es)
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#define FS_sig(context) ((context)->uc_mcontext->ss.fs)
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#define GS_sig(context) ((context)->uc_mcontext->ss.gs)
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#define SS_sig(context) ((context)->uc_mcontext->ss.ss)
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#define EFL_sig(context) ((context)->uc_mcontext->ss.eflags)
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#define EIP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.eip))
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#define ESP_sig(context) (*((unsigned long*)&(context)->uc_mcontext->ss.esp))
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#define HANDLER_DEF(name) void name( int __signal, siginfo_t *__siginfo, SIGCONTEXT *__context )
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#define HANDLER_CONTEXT (__context)
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#define TRAP_sig(context) ((context)->uc_mcontext->es.trapno)
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#define ERROR_sig(context) ((context)->uc_mcontext->es.err)
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#define FAULT_ADDRESS (__siginfo->si_addr)
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#endif /* __APPLE__ */
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#if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) ||\
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defined(__OpenBSD__) || defined(__EMX__) || defined(__CYGWIN__)
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#define EAX_sig(context) ((context)->sc_eax)
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#define EBX_sig(context) ((context)->sc_ebx)
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#define ECX_sig(context) ((context)->sc_ecx)
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#define EDX_sig(context) ((context)->sc_edx)
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#define ESI_sig(context) ((context)->sc_esi)
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#define EDI_sig(context) ((context)->sc_edi)
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#define EBP_sig(context) ((context)->sc_ebp)
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#define CS_sig(context) ((context)->sc_cs)
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#define DS_sig(context) ((context)->sc_ds)
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#define ES_sig(context) ((context)->sc_es)
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#define FS_sig(context) ((context)->sc_fs)
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#define GS_sig(context) ((context)->sc_gs)
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#define SS_sig(context) ((context)->sc_ss)
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#define TRAP_sig(context) ((context)->sc_trapno)
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#ifdef __NetBSD__
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#define ERROR_sig(context) ((context)->sc_err)
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#endif
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#ifdef linux
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#define ERROR_sig(context) ((context)->sc_err)
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#define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->i387))
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#define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->cr2)
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#endif
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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#define EFL_sig(context) ((context)->sc_efl)
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/* FreeBSD, see i386/i386/traps.c::trap_pfault va->err kludge */
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#define FAULT_ADDRESS ((void *)HANDLER_CONTEXT->sc_err)
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#else
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#define EFL_sig(context) ((context)->sc_eflags)
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#endif
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#define EIP_sig(context) (*((unsigned long*)&(context)->sc_eip))
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#define ESP_sig(context) (*((unsigned long*)&(context)->sc_esp))
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#endif /* linux || __NetBSD__ || __FreeBSD__ || __OpenBSD__ */
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#if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
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#ifdef _SCO_DS
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#define gregs regs
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#endif
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#define EAX_sig(context) ((context)->uc_mcontext.gregs[EAX])
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#define EBX_sig(context) ((context)->uc_mcontext.gregs[EBX])
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#define ECX_sig(context) ((context)->uc_mcontext.gregs[ECX])
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#define EDX_sig(context) ((context)->uc_mcontext.gregs[EDX])
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#define ESI_sig(context) ((context)->uc_mcontext.gregs[ESI])
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#define EDI_sig(context) ((context)->uc_mcontext.gregs[EDI])
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#define EBP_sig(context) ((context)->uc_mcontext.gregs[EBP])
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#define CS_sig(context) ((context)->uc_mcontext.gregs[CS])
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#define DS_sig(context) ((context)->uc_mcontext.gregs[DS])
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#define ES_sig(context) ((context)->uc_mcontext.gregs[ES])
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#define SS_sig(context) ((context)->uc_mcontext.gregs[SS])
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#define FS_sig(context) ((context)->uc_mcontext.gregs[FS])
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#define GS_sig(context) ((context)->uc_mcontext.gregs[GS])
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#define EFL_sig(context) ((context)->uc_mcontext.gregs[EFL])
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#define EIP_sig(context) ((context)->uc_mcontext.gregs[EIP])
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#ifdef UESP
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#define ESP_sig(context) ((context)->uc_mcontext.gregs[UESP])
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#elif defined(R_ESP)
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#define ESP_sig(context) ((context)->uc_mcontext.gregs[R_ESP])
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#else
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#define ESP_sig(context) ((context)->uc_mcontext.gregs[ESP])
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#endif
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#ifdef TRAPNO
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#define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
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#endif
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#define FAULT_ADDRESS (__siginfo->si_addr)
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#endif /* svr4 || SCO_DS */
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#include "wine/exception.h"
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#include "wine/debug.h"
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WINE_DEFAULT_DEBUG_CHANNEL(seh);
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typedef int (*wine_signal_handler)(unsigned int sig);
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static size_t signal_stack_mask;
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static size_t signal_stack_size;
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static wine_signal_handler handlers[256];
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extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
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enum i386_trap_code
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{
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TRAP_x86_UNKNOWN = -1, /* Unknown fault (TRAP_sig not defined) */
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TRAP_x86_DIVIDE = 0, /* Division by zero exception */
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TRAP_x86_TRCTRAP = 1, /* Single-step exception */
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TRAP_x86_NMI = 2, /* NMI interrupt */
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TRAP_x86_BPTFLT = 3, /* Breakpoint exception */
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TRAP_x86_OFLOW = 4, /* Overflow exception */
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TRAP_x86_BOUND = 5, /* Bound range exception */
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TRAP_x86_PRIVINFLT = 6, /* Invalid opcode exception */
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TRAP_x86_DNA = 7, /* Device not available exception */
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TRAP_x86_DOUBLEFLT = 8, /* Double fault exception */
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TRAP_x86_FPOPFLT = 9, /* Coprocessor segment overrun */
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TRAP_x86_TSSFLT = 10, /* Invalid TSS exception */
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TRAP_x86_SEGNPFLT = 11, /* Segment not present exception */
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TRAP_x86_STKFLT = 12, /* Stack fault */
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TRAP_x86_PROTFLT = 13, /* General protection fault */
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TRAP_x86_PAGEFLT = 14, /* Page fault */
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TRAP_x86_ARITHTRAP = 16, /* Floating point exception */
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TRAP_x86_ALIGNFLT = 17, /* Alignment check exception */
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TRAP_x86_MCHK = 18, /* Machine check exception */
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TRAP_x86_CACHEFLT = 19 /* Cache flush exception */
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};
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/***********************************************************************
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* dispatch_signal
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*/
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inline static int dispatch_signal(unsigned int sig)
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{
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|
if (handlers[sig] == NULL) return 0;
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return handlers[sig](sig);
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}
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/***********************************************************************
|
|
* get_trap_code
|
|
*
|
|
* Get the trap code for a signal.
|
|
*/
|
|
static inline enum i386_trap_code get_trap_code( const SIGCONTEXT *sigcontext )
|
|
{
|
|
#ifdef TRAP_sig
|
|
return TRAP_sig(sigcontext);
|
|
#else
|
|
return TRAP_x86_UNKNOWN; /* unknown trap code */
|
|
#endif
|
|
}
|
|
|
|
/***********************************************************************
|
|
* get_error_code
|
|
*
|
|
* Get the error code for a signal.
|
|
*/
|
|
static inline WORD get_error_code( const SIGCONTEXT *sigcontext )
|
|
{
|
|
#ifdef ERROR_sig
|
|
return ERROR_sig(sigcontext);
|
|
#else
|
|
return 0;
|
|
#endif
|
|
}
|
|
|
|
/***********************************************************************
|
|
* get_signal_stack
|
|
*
|
|
* Get the base of the signal stack for the current thread.
|
|
*/
|
|
static inline void *get_signal_stack(void)
|
|
{
|
|
return (char *)NtCurrentTeb() + 4096;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* get_current_teb
|
|
*
|
|
* Get the current teb based on the stack pointer.
|
|
*/
|
|
static inline TEB *get_current_teb(void)
|
|
{
|
|
unsigned long esp;
|
|
__asm__("movl %%esp,%0" : "=g" (esp) );
|
|
return (TEB *)(esp & ~signal_stack_mask);
|
|
}
|
|
|
|
|
|
#ifdef __HAVE_VM86
|
|
/***********************************************************************
|
|
* save_vm86_context
|
|
*
|
|
* Set the register values from a vm86 structure.
|
|
*/
|
|
static void save_vm86_context( CONTEXT *context, const struct vm86plus_struct *vm86 )
|
|
{
|
|
context->ContextFlags = CONTEXT_FULL;
|
|
context->Eax = vm86->regs.eax;
|
|
context->Ebx = vm86->regs.ebx;
|
|
context->Ecx = vm86->regs.ecx;
|
|
context->Edx = vm86->regs.edx;
|
|
context->Esi = vm86->regs.esi;
|
|
context->Edi = vm86->regs.edi;
|
|
context->Esp = vm86->regs.esp;
|
|
context->Ebp = vm86->regs.ebp;
|
|
context->Eip = vm86->regs.eip;
|
|
context->SegCs = vm86->regs.cs;
|
|
context->SegDs = vm86->regs.ds;
|
|
context->SegEs = vm86->regs.es;
|
|
context->SegFs = vm86->regs.fs;
|
|
context->SegGs = vm86->regs.gs;
|
|
context->SegSs = vm86->regs.ss;
|
|
context->EFlags = vm86->regs.eflags;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* restore_vm86_context
|
|
*
|
|
* Build a vm86 structure from the register values.
|
|
*/
|
|
static void restore_vm86_context( const CONTEXT *context, struct vm86plus_struct *vm86 )
|
|
{
|
|
vm86->regs.eax = context->Eax;
|
|
vm86->regs.ebx = context->Ebx;
|
|
vm86->regs.ecx = context->Ecx;
|
|
vm86->regs.edx = context->Edx;
|
|
vm86->regs.esi = context->Esi;
|
|
vm86->regs.edi = context->Edi;
|
|
vm86->regs.esp = context->Esp;
|
|
vm86->regs.ebp = context->Ebp;
|
|
vm86->regs.eip = context->Eip;
|
|
vm86->regs.cs = context->SegCs;
|
|
vm86->regs.ds = context->SegDs;
|
|
vm86->regs.es = context->SegEs;
|
|
vm86->regs.fs = context->SegFs;
|
|
vm86->regs.gs = context->SegGs;
|
|
vm86->regs.ss = context->SegSs;
|
|
vm86->regs.eflags = context->EFlags;
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* merge_vm86_pending_flags
|
|
*
|
|
* Merges TEB.vm86_ptr and TEB.vm86_pending VIP flags and
|
|
* raises exception if there are pending events and VIF flag
|
|
* has been turned on.
|
|
*
|
|
* Called from __wine_enter_vm86 because vm86_enter
|
|
* doesn't check for pending events.
|
|
*
|
|
* Called from raise_vm86_sti_exception to check for
|
|
* pending events in a signal safe way.
|
|
*/
|
|
static void merge_vm86_pending_flags( EXCEPTION_RECORD *rec )
|
|
{
|
|
BOOL check_pending = TRUE;
|
|
struct vm86plus_struct *vm86 =
|
|
(struct vm86plus_struct*)(ntdll_get_thread_data()->vm86_ptr);
|
|
|
|
/*
|
|
* In order to prevent a race when SIGUSR2 occurs while
|
|
* we are returning from exception handler, pending events
|
|
* will be rechecked after each raised exception.
|
|
*/
|
|
while (check_pending && NtCurrentTeb()->vm86_pending)
|
|
{
|
|
check_pending = FALSE;
|
|
ntdll_get_thread_data()->vm86_ptr = NULL;
|
|
|
|
/*
|
|
* If VIF is set, throw exception.
|
|
* Note that SIGUSR2 may turn VIF flag off so
|
|
* VIF check must occur only when TEB.vm86_ptr is NULL.
|
|
*/
|
|
if (vm86->regs.eflags & VIF_MASK)
|
|
{
|
|
CONTEXT vcontext;
|
|
save_vm86_context( &vcontext, vm86 );
|
|
|
|
rec->ExceptionCode = EXCEPTION_VM86_STI;
|
|
rec->ExceptionFlags = EXCEPTION_CONTINUABLE;
|
|
rec->ExceptionRecord = NULL;
|
|
rec->NumberParameters = 0;
|
|
rec->ExceptionAddress = (LPVOID)vcontext.Eip;
|
|
|
|
vcontext.EFlags &= ~VIP_MASK;
|
|
NtCurrentTeb()->vm86_pending = 0;
|
|
__regs_RtlRaiseException( rec, &vcontext );
|
|
|
|
restore_vm86_context( &vcontext, vm86 );
|
|
check_pending = TRUE;
|
|
}
|
|
|
|
ntdll_get_thread_data()->vm86_ptr = vm86;
|
|
}
|
|
|
|
/*
|
|
* Merge VIP flags in a signal safe way. This requires
|
|
* that the following operation compiles into atomic
|
|
* instruction.
|
|
*/
|
|
vm86->regs.eflags |= NtCurrentTeb()->vm86_pending;
|
|
}
|
|
#endif /* __HAVE_VM86 */
|
|
|
|
|
|
typedef void (WINAPI *raise_func)( EXCEPTION_RECORD *rec, CONTEXT *context );
|
|
|
|
|
|
/***********************************************************************
|
|
* init_handler
|
|
*
|
|
* Handler initialization when the full context is not needed.
|
|
*/
|
|
inline static void *init_handler( const SIGCONTEXT *sigcontext, WORD *fs, WORD *gs )
|
|
{
|
|
void *stack = (void *)ESP_sig(sigcontext);
|
|
TEB *teb = get_current_teb();
|
|
struct ntdll_thread_regs *thread_regs = (struct ntdll_thread_regs *)teb->SpareBytes1;
|
|
|
|
/* get %fs and %gs at time of the fault */
|
|
#ifdef FS_sig
|
|
*fs = LOWORD(FS_sig(sigcontext));
|
|
#else
|
|
*fs = wine_get_fs();
|
|
#endif
|
|
#ifdef GS_sig
|
|
*gs = LOWORD(GS_sig(sigcontext));
|
|
#else
|
|
*gs = wine_get_gs();
|
|
#endif
|
|
|
|
wine_set_fs( thread_regs->fs );
|
|
|
|
/* now restore a proper %gs for the fault handler */
|
|
if (!wine_ldt_is_system(CS_sig(sigcontext)) ||
|
|
!wine_ldt_is_system(SS_sig(sigcontext))) /* 16-bit mode */
|
|
{
|
|
/*
|
|
* Win16 or DOS protected mode. Note that during switch
|
|
* from 16-bit mode to linear mode, CS may be set to system
|
|
* segment before FS is restored. Fortunately, in this case
|
|
* SS is still non-system segment. This is why both CS and SS
|
|
* are checked.
|
|
*/
|
|
wine_set_gs( thread_regs->gs );
|
|
stack = teb->WOW32Reserved;
|
|
}
|
|
#ifdef __HAVE_VM86
|
|
else if ((void *)EIP_sig(sigcontext) == vm86_return) /* vm86 mode */
|
|
{
|
|
unsigned int *int_stack = stack;
|
|
/* fetch the saved %gs from the stack */
|
|
wine_set_gs( int_stack[0] );
|
|
}
|
|
#endif
|
|
else /* 32-bit mode */
|
|
{
|
|
#ifdef GS_sig
|
|
wine_set_gs( GS_sig(sigcontext) );
|
|
#endif
|
|
}
|
|
return stack;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* restore_fpu
|
|
*
|
|
* Restore the FPU context to a sigcontext.
|
|
*/
|
|
inline static void restore_fpu( const CONTEXT *context )
|
|
{
|
|
FLOATING_SAVE_AREA float_status = context->FloatSave;
|
|
/* reset the current interrupt status */
|
|
float_status.StatusWord &= float_status.ControlWord | 0xffffff80;
|
|
#ifdef __GNUC__
|
|
__asm__ __volatile__( "frstor %0; fwait" : : "m" (float_status) );
|
|
#endif /* __GNUC__ */
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* save_context
|
|
*
|
|
* Build a context structure from the signal info.
|
|
*/
|
|
inline static void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
|
|
{
|
|
struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
|
|
|
|
memset(context, 0, sizeof(*context));
|
|
context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
|
|
context->Eax = EAX_sig(sigcontext);
|
|
context->Ebx = EBX_sig(sigcontext);
|
|
context->Ecx = ECX_sig(sigcontext);
|
|
context->Edx = EDX_sig(sigcontext);
|
|
context->Esi = ESI_sig(sigcontext);
|
|
context->Edi = EDI_sig(sigcontext);
|
|
context->Ebp = EBP_sig(sigcontext);
|
|
context->EFlags = EFL_sig(sigcontext);
|
|
context->Eip = EIP_sig(sigcontext);
|
|
context->Esp = ESP_sig(sigcontext);
|
|
context->SegCs = LOWORD(CS_sig(sigcontext));
|
|
context->SegDs = LOWORD(DS_sig(sigcontext));
|
|
context->SegEs = LOWORD(ES_sig(sigcontext));
|
|
context->SegFs = fs;
|
|
context->SegGs = gs;
|
|
context->SegSs = LOWORD(SS_sig(sigcontext));
|
|
context->Dr0 = regs->dr0;
|
|
context->Dr1 = regs->dr1;
|
|
context->Dr2 = regs->dr2;
|
|
context->Dr3 = regs->dr3;
|
|
context->Dr6 = regs->dr6;
|
|
context->Dr7 = regs->dr7;
|
|
|
|
#ifdef FPU_sig
|
|
if (FPU_sig(sigcontext))
|
|
{
|
|
context->ContextFlags |= CONTEXT_FLOATING_POINT;
|
|
context->FloatSave = *FPU_sig(sigcontext);
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
#ifdef __GNUC__
|
|
context->ContextFlags |= CONTEXT_FLOATING_POINT;
|
|
__asm__ __volatile__( "fnsave %0; fwait" : "=m" (context->FloatSave) );
|
|
#endif
|
|
}
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* restore_context
|
|
*
|
|
* Restore the signal info from the context.
|
|
*/
|
|
inline static void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
|
|
{
|
|
struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
|
|
|
|
regs->dr0 = context->Dr0;
|
|
regs->dr1 = context->Dr1;
|
|
regs->dr2 = context->Dr2;
|
|
regs->dr3 = context->Dr3;
|
|
regs->dr6 = context->Dr6;
|
|
regs->dr7 = context->Dr7;
|
|
EAX_sig(sigcontext) = context->Eax;
|
|
EBX_sig(sigcontext) = context->Ebx;
|
|
ECX_sig(sigcontext) = context->Ecx;
|
|
EDX_sig(sigcontext) = context->Edx;
|
|
ESI_sig(sigcontext) = context->Esi;
|
|
EDI_sig(sigcontext) = context->Edi;
|
|
EBP_sig(sigcontext) = context->Ebp;
|
|
EFL_sig(sigcontext) = context->EFlags;
|
|
EIP_sig(sigcontext) = context->Eip;
|
|
ESP_sig(sigcontext) = context->Esp;
|
|
CS_sig(sigcontext) = context->SegCs;
|
|
DS_sig(sigcontext) = context->SegDs;
|
|
ES_sig(sigcontext) = context->SegEs;
|
|
SS_sig(sigcontext) = context->SegSs;
|
|
#ifdef GS_sig
|
|
GS_sig(sigcontext) = context->SegGs;
|
|
#else
|
|
wine_set_gs( context->SegGs );
|
|
#endif
|
|
#ifdef FS_sig
|
|
FS_sig(sigcontext) = context->SegFs;
|
|
#else
|
|
wine_set_fs( context->SegFs );
|
|
#endif
|
|
|
|
#ifdef FPU_sig
|
|
if (FPU_sig(sigcontext))
|
|
{
|
|
*FPU_sig(sigcontext) = context->FloatSave;
|
|
}
|
|
else
|
|
#endif
|
|
{
|
|
restore_fpu( context );
|
|
}
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* set_cpu_context
|
|
*
|
|
* Set the new CPU context. Used by NtSetContextThread.
|
|
*/
|
|
void set_cpu_context( const CONTEXT *context )
|
|
{
|
|
DWORD flags = context->ContextFlags & ~CONTEXT_i386;
|
|
|
|
if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
|
|
|
|
if (flags & CONTEXT_DEBUG_REGISTERS)
|
|
{
|
|
struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
|
|
regs->dr0 = context->Dr0;
|
|
regs->dr1 = context->Dr1;
|
|
regs->dr2 = context->Dr2;
|
|
regs->dr3 = context->Dr3;
|
|
regs->dr6 = context->Dr6;
|
|
regs->dr7 = context->Dr7;
|
|
}
|
|
if (flags & CONTEXT_FULL)
|
|
{
|
|
if ((flags & CONTEXT_FULL) != (CONTEXT_FULL & ~CONTEXT_i386))
|
|
FIXME( "setting partial context (%lx) not supported\n", flags );
|
|
else
|
|
__wine_call_from_32_restore_regs( context );
|
|
}
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* is_privileged_instr
|
|
*
|
|
* Check if the fault location is a privileged instruction.
|
|
* Based on the instruction emulation code in dlls/kernel/instr.c.
|
|
*/
|
|
static inline int is_privileged_instr( CONTEXT86 *context )
|
|
{
|
|
const BYTE *instr;
|
|
unsigned int prefix_count = 0;
|
|
|
|
if (!wine_ldt_is_system( context->SegCs )) return 0;
|
|
instr = (BYTE *)context->Eip;
|
|
|
|
for (;;) switch(*instr)
|
|
{
|
|
/* instruction prefixes */
|
|
case 0x2e: /* %cs: */
|
|
case 0x36: /* %ss: */
|
|
case 0x3e: /* %ds: */
|
|
case 0x26: /* %es: */
|
|
case 0x64: /* %fs: */
|
|
case 0x65: /* %gs: */
|
|
case 0x66: /* opcode size */
|
|
case 0x67: /* addr size */
|
|
case 0xf0: /* lock */
|
|
case 0xf2: /* repne */
|
|
case 0xf3: /* repe */
|
|
if (++prefix_count >= 15) return 0;
|
|
instr++;
|
|
continue;
|
|
|
|
case 0x0f: /* extended instruction */
|
|
switch(instr[1])
|
|
{
|
|
case 0x20: /* mov crX, reg */
|
|
case 0x21: /* mov drX, reg */
|
|
case 0x22: /* mov reg, crX */
|
|
case 0x23: /* mov reg drX */
|
|
return 1;
|
|
}
|
|
return 0;
|
|
case 0x6c: /* insb (%dx) */
|
|
case 0x6d: /* insl (%dx) */
|
|
case 0x6e: /* outsb (%dx) */
|
|
case 0x6f: /* outsl (%dx) */
|
|
case 0xcd: /* int $xx */
|
|
case 0xe4: /* inb al,XX */
|
|
case 0xe5: /* in (e)ax,XX */
|
|
case 0xe6: /* outb XX,al */
|
|
case 0xe7: /* out XX,(e)ax */
|
|
case 0xec: /* inb (%dx),%al */
|
|
case 0xed: /* inl (%dx),%eax */
|
|
case 0xee: /* outb %al,(%dx) */
|
|
case 0xef: /* outl %eax,(%dx) */
|
|
case 0xf4: /* hlt */
|
|
case 0xfa: /* cli */
|
|
case 0xfb: /* sti */
|
|
return 1;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
#include "pshpack1.h"
|
|
struct atl_thunk
|
|
{
|
|
DWORD movl; /* movl this,4(%esp) */
|
|
DWORD this;
|
|
BYTE jmp; /* jmp func */
|
|
int func;
|
|
};
|
|
#include "poppack.h"
|
|
|
|
/**********************************************************************
|
|
* check_atl_thunk
|
|
*
|
|
* Check if code destination is an ATL thunk, and emulate it if so.
|
|
*/
|
|
static BOOL check_atl_thunk( EXCEPTION_RECORD *rec, CONTEXT *context )
|
|
{
|
|
struct atl_thunk *thunk = (struct atl_thunk *)rec->ExceptionInformation[1];
|
|
|
|
if (thunk->movl != 0x042444c7 || thunk->jmp != 0xe9) return FALSE;
|
|
*((DWORD *)context->Esp + 1) = thunk->this;
|
|
context->Eip = (DWORD_PTR)(&thunk->func + 1) + thunk->func;
|
|
TRACE( "emulating ATL thunk at %p, func=%08lx arg=%08lx\n",
|
|
thunk, context->Eip, *((DWORD *)context->Esp + 1) );
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* setup_exception
|
|
*
|
|
* Setup a proper stack frame for the raise function, and modify the
|
|
* sigcontext so that the return from the signal handler will call
|
|
* the raise function.
|
|
*/
|
|
static EXCEPTION_RECORD *setup_exception( SIGCONTEXT *sigcontext, raise_func func )
|
|
{
|
|
struct stack_layout
|
|
{
|
|
void *ret_addr; /* return address from raise_func */
|
|
EXCEPTION_RECORD *rec_ptr; /* first arg for raise_func */
|
|
CONTEXT *context_ptr; /* second arg for raise_func */
|
|
CONTEXT context;
|
|
EXCEPTION_RECORD rec;
|
|
DWORD ebp;
|
|
DWORD eip;
|
|
} *stack;
|
|
|
|
WORD fs, gs;
|
|
|
|
stack = init_handler( sigcontext, &fs, &gs );
|
|
|
|
/* stack sanity checks */
|
|
|
|
if ((char *)stack >= (char *)get_signal_stack() &&
|
|
(char *)stack < (char *)get_signal_stack() + signal_stack_size)
|
|
{
|
|
ERR( "nested exception on signal stack in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
|
|
GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
|
|
NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
|
|
server_abort_thread(1);
|
|
}
|
|
|
|
if (stack - 1 > stack || /* check for overflow in subtraction */
|
|
(char *)(stack - 1) < (char *)NtCurrentTeb()->Tib.StackLimit ||
|
|
(char *)stack > (char *)NtCurrentTeb()->Tib.StackBase)
|
|
{
|
|
UINT diff = (char *)NtCurrentTeb()->Tib.StackLimit - (char *)stack;
|
|
if (diff < 4096)
|
|
{
|
|
ERR( "stack overflow %u bytes in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
|
|
diff, GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
|
|
NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
|
|
server_abort_thread(1);
|
|
}
|
|
else WARN( "exception outside of stack limits in thread %04lx eip %08lx esp %08lx stack %p-%p\n",
|
|
GetCurrentThreadId(), EIP_sig(sigcontext), ESP_sig(sigcontext),
|
|
NtCurrentTeb()->Tib.StackLimit, NtCurrentTeb()->Tib.StackBase );
|
|
}
|
|
|
|
stack--; /* push the stack_layout structure */
|
|
#ifdef HAVE_VALGRIND_MEMCHECK_H
|
|
VALGRIND_MAKE_WRITABLE(stack, sizeof(*stack));
|
|
#endif
|
|
stack->ret_addr = (void *)0xdeadbabe; /* raise_func must not return */
|
|
stack->rec_ptr = &stack->rec;
|
|
stack->context_ptr = &stack->context;
|
|
|
|
stack->rec.ExceptionRecord = NULL;
|
|
stack->rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
|
|
stack->rec.ExceptionAddress = (LPVOID)EIP_sig(sigcontext);
|
|
stack->rec.NumberParameters = 0;
|
|
|
|
save_context( &stack->context, sigcontext, fs, gs );
|
|
|
|
/* now modify the sigcontext to return to the raise function */
|
|
ESP_sig(sigcontext) = (DWORD)stack;
|
|
EIP_sig(sigcontext) = (DWORD)func;
|
|
EFL_sig(sigcontext) &= ~0x100; /* clear single-step flag */
|
|
CS_sig(sigcontext) = wine_get_cs();
|
|
DS_sig(sigcontext) = wine_get_ds();
|
|
ES_sig(sigcontext) = wine_get_es();
|
|
FS_sig(sigcontext) = wine_get_fs();
|
|
GS_sig(sigcontext) = wine_get_gs();
|
|
SS_sig(sigcontext) = wine_get_ss();
|
|
|
|
return stack->rec_ptr;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* get_exception_context
|
|
*
|
|
* Get a pointer to the context built by setup_exception.
|
|
*/
|
|
static inline CONTEXT *get_exception_context( EXCEPTION_RECORD *rec )
|
|
{
|
|
return (CONTEXT *)rec - 1; /* cf. stack_layout structure */
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* get_fpu_code
|
|
*
|
|
* Get the FPU exception code from the FPU status.
|
|
*/
|
|
static inline DWORD get_fpu_code( const CONTEXT *context )
|
|
{
|
|
DWORD status = context->FloatSave.StatusWord;
|
|
|
|
if (status & 0x01) /* IE */
|
|
{
|
|
if (status & 0x40) /* SF */
|
|
return EXCEPTION_FLT_STACK_CHECK;
|
|
else
|
|
return EXCEPTION_FLT_INVALID_OPERATION;
|
|
}
|
|
if (status & 0x02) return EXCEPTION_FLT_DENORMAL_OPERAND; /* DE flag */
|
|
if (status & 0x04) return EXCEPTION_FLT_DIVIDE_BY_ZERO; /* ZE flag */
|
|
if (status & 0x08) return EXCEPTION_FLT_OVERFLOW; /* OE flag */
|
|
if (status & 0x10) return EXCEPTION_FLT_UNDERFLOW; /* UE flag */
|
|
if (status & 0x20) return EXCEPTION_FLT_INEXACT_RESULT; /* PE flag */
|
|
return EXCEPTION_FLT_INVALID_OPERATION; /* generic error */
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* raise_segv_exception
|
|
*/
|
|
static void WINAPI raise_segv_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
|
|
{
|
|
switch(rec->ExceptionCode)
|
|
{
|
|
case EXCEPTION_ACCESS_VIOLATION:
|
|
if (rec->NumberParameters == 2)
|
|
{
|
|
if ((rec->ExceptionInformation[0] == 8) && check_atl_thunk( rec, context )) goto done;
|
|
rec->ExceptionCode = VIRTUAL_HandleFault( (void *)rec->ExceptionInformation[1] );
|
|
}
|
|
break;
|
|
case EXCEPTION_DATATYPE_MISALIGNMENT:
|
|
/* FIXME: pass through exception handler first? */
|
|
if (context->EFlags & 0x00040000)
|
|
{
|
|
/* Disable AC flag, return */
|
|
context->EFlags &= ~0x00040000;
|
|
goto done;
|
|
}
|
|
break;
|
|
}
|
|
__regs_RtlRaiseException( rec, context );
|
|
done:
|
|
NtSetContextThread( GetCurrentThread(), context );
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* raise_trap_exception
|
|
*/
|
|
static void WINAPI raise_trap_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
|
|
{
|
|
if (rec->ExceptionCode == EXCEPTION_SINGLE_STEP)
|
|
{
|
|
if (context->EFlags & 0x100)
|
|
{
|
|
context->EFlags &= ~0x100; /* clear single-step flag */
|
|
}
|
|
else /* hardware breakpoint, fetch the debug registers */
|
|
{
|
|
context->ContextFlags = CONTEXT_DEBUG_REGISTERS;
|
|
NtGetContextThread(GetCurrentThread(), context);
|
|
/* do we really have a bp from a debug register ?
|
|
* if not, then someone did a kill(SIGTRAP) on us, and we
|
|
* shall return a breakpoint, not a single step exception
|
|
*/
|
|
if (!(context->Dr6 & 0xf)) rec->ExceptionCode = EXCEPTION_BREAKPOINT;
|
|
context->ContextFlags |= CONTEXT_FULL; /* restore flags */
|
|
}
|
|
}
|
|
|
|
__regs_RtlRaiseException( rec, context );
|
|
NtSetContextThread( GetCurrentThread(), context );
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* raise_exception
|
|
*
|
|
* Generic raise function for exceptions that don't need special treatment.
|
|
*/
|
|
static void WINAPI raise_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
|
|
{
|
|
__regs_RtlRaiseException( rec, context );
|
|
NtSetContextThread( GetCurrentThread(), context );
|
|
}
|
|
|
|
|
|
#ifdef __HAVE_VM86
|
|
/**********************************************************************
|
|
* raise_vm86_sti_exception
|
|
*/
|
|
static void WINAPI raise_vm86_sti_exception( EXCEPTION_RECORD *rec, CONTEXT *context )
|
|
{
|
|
/* merge_vm86_pending_flags merges the vm86_pending flag in safely */
|
|
NtCurrentTeb()->vm86_pending |= VIP_MASK;
|
|
|
|
if (ntdll_get_thread_data()->vm86_ptr)
|
|
{
|
|
if (((char*)context->Eip >= (char*)vm86_return) &&
|
|
((char*)context->Eip <= (char*)vm86_return_end) &&
|
|
(VM86_TYPE(context->Eax) != VM86_SIGNAL)) {
|
|
/* exiting from VM86, can't throw */
|
|
goto done;
|
|
}
|
|
merge_vm86_pending_flags( rec );
|
|
}
|
|
else if (NtCurrentTeb()->dpmi_vif &&
|
|
!wine_ldt_is_system(context->SegCs) &&
|
|
!wine_ldt_is_system(context->SegSs))
|
|
{
|
|
/* Executing DPMI code and virtual interrupts are enabled. */
|
|
NtCurrentTeb()->vm86_pending = 0;
|
|
__regs_RtlRaiseException( rec, context );
|
|
}
|
|
done:
|
|
NtSetContextThread( GetCurrentThread(), context );
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* usr2_handler
|
|
*
|
|
* Handler for SIGUSR2.
|
|
* We use it to signal that the running __wine_enter_vm86() should
|
|
* immediately set VIP_MASK, causing pending events to be handled
|
|
* as early as possible.
|
|
*/
|
|
static HANDLER_DEF(usr2_handler)
|
|
{
|
|
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_vm86_sti_exception );
|
|
rec->ExceptionCode = EXCEPTION_VM86_STI;
|
|
}
|
|
#endif /* __HAVE_VM86 */
|
|
|
|
|
|
/**********************************************************************
|
|
* segv_handler
|
|
*
|
|
* Handler for SIGSEGV and related errors.
|
|
*/
|
|
static HANDLER_DEF(segv_handler)
|
|
{
|
|
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_segv_exception );
|
|
|
|
switch(get_trap_code(HANDLER_CONTEXT))
|
|
{
|
|
case TRAP_x86_OFLOW: /* Overflow exception */
|
|
rec->ExceptionCode = EXCEPTION_INT_OVERFLOW;
|
|
break;
|
|
case TRAP_x86_BOUND: /* Bound range exception */
|
|
rec->ExceptionCode = EXCEPTION_ARRAY_BOUNDS_EXCEEDED;
|
|
break;
|
|
case TRAP_x86_PRIVINFLT: /* Invalid opcode exception */
|
|
rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
|
|
break;
|
|
case TRAP_x86_STKFLT: /* Stack fault */
|
|
rec->ExceptionCode = EXCEPTION_STACK_OVERFLOW;
|
|
break;
|
|
case TRAP_x86_SEGNPFLT: /* Segment not present exception */
|
|
case TRAP_x86_PROTFLT: /* General protection fault */
|
|
case TRAP_x86_UNKNOWN: /* Unknown fault code */
|
|
if (!get_error_code(HANDLER_CONTEXT) && is_privileged_instr( get_exception_context(rec) ))
|
|
rec->ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
|
|
else
|
|
{
|
|
WORD err = get_error_code(HANDLER_CONTEXT);
|
|
rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
|
|
rec->NumberParameters = 2;
|
|
rec->ExceptionInformation[0] = 0;
|
|
/* if error contains a LDT selector, use that as fault address */
|
|
rec->ExceptionInformation[1] = (err & 7) == 4 ? (err & ~7) : 0xffffffff;
|
|
}
|
|
break;
|
|
case TRAP_x86_PAGEFLT: /* Page fault */
|
|
rec->ExceptionCode = EXCEPTION_ACCESS_VIOLATION;
|
|
#ifdef FAULT_ADDRESS
|
|
rec->NumberParameters = 2;
|
|
rec->ExceptionInformation[0] = (get_error_code(HANDLER_CONTEXT) >> 1) & 0x09;
|
|
rec->ExceptionInformation[1] = (ULONG_PTR)FAULT_ADDRESS;
|
|
#endif
|
|
break;
|
|
case TRAP_x86_ALIGNFLT: /* Alignment check exception */
|
|
rec->ExceptionCode = EXCEPTION_DATATYPE_MISALIGNMENT;
|
|
break;
|
|
default:
|
|
ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
|
|
/* fall through */
|
|
case TRAP_x86_NMI: /* NMI interrupt */
|
|
case TRAP_x86_DNA: /* Device not available exception */
|
|
case TRAP_x86_DOUBLEFLT: /* Double fault exception */
|
|
case TRAP_x86_TSSFLT: /* Invalid TSS exception */
|
|
case TRAP_x86_MCHK: /* Machine check exception */
|
|
case TRAP_x86_CACHEFLT: /* Cache flush exception */
|
|
rec->ExceptionCode = EXCEPTION_ILLEGAL_INSTRUCTION;
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* trap_handler
|
|
*
|
|
* Handler for SIGTRAP.
|
|
*/
|
|
static HANDLER_DEF(trap_handler)
|
|
{
|
|
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_trap_exception );
|
|
|
|
switch(get_trap_code(HANDLER_CONTEXT))
|
|
{
|
|
case TRAP_x86_TRCTRAP: /* Single-step exception */
|
|
rec->ExceptionCode = EXCEPTION_SINGLE_STEP;
|
|
break;
|
|
case TRAP_x86_BPTFLT: /* Breakpoint exception */
|
|
rec->ExceptionAddress = (char *)rec->ExceptionAddress - 1; /* back up over the int3 instruction */
|
|
/* fall through */
|
|
default:
|
|
rec->ExceptionCode = EXCEPTION_BREAKPOINT;
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* fpe_handler
|
|
*
|
|
* Handler for SIGFPE.
|
|
*/
|
|
static HANDLER_DEF(fpe_handler)
|
|
{
|
|
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_exception );
|
|
CONTEXT *context;
|
|
|
|
context = get_exception_context( rec );
|
|
|
|
switch(get_trap_code(HANDLER_CONTEXT))
|
|
{
|
|
case TRAP_x86_DIVIDE: /* Division by zero exception */
|
|
rec->ExceptionCode = EXCEPTION_INT_DIVIDE_BY_ZERO;
|
|
break;
|
|
case TRAP_x86_FPOPFLT: /* Coprocessor segment overrun */
|
|
rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
|
|
break;
|
|
case TRAP_x86_ARITHTRAP: /* Floating point exception */
|
|
case TRAP_x86_UNKNOWN: /* Unknown fault code */
|
|
rec->ExceptionCode = get_fpu_code( context );
|
|
break;
|
|
default:
|
|
ERR( "Got unexpected trap %d\n", get_trap_code(HANDLER_CONTEXT) );
|
|
rec->ExceptionCode = EXCEPTION_FLT_INVALID_OPERATION;
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* int_handler
|
|
*
|
|
* Handler for SIGINT.
|
|
*
|
|
* FIXME: should not be calling external functions on the signal stack.
|
|
*/
|
|
static HANDLER_DEF(int_handler)
|
|
{
|
|
WORD fs, gs;
|
|
init_handler( HANDLER_CONTEXT, &fs, &gs );
|
|
if (!dispatch_signal(SIGINT))
|
|
{
|
|
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_exception );
|
|
rec->ExceptionCode = CONTROL_C_EXIT;
|
|
}
|
|
}
|
|
|
|
/**********************************************************************
|
|
* abrt_handler
|
|
*
|
|
* Handler for SIGABRT.
|
|
*/
|
|
static HANDLER_DEF(abrt_handler)
|
|
{
|
|
EXCEPTION_RECORD *rec = setup_exception( HANDLER_CONTEXT, raise_exception );
|
|
rec->ExceptionCode = EXCEPTION_WINE_ASSERTION;
|
|
rec->ExceptionFlags = EH_NONCONTINUABLE;
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* term_handler
|
|
*
|
|
* Handler for SIGTERM.
|
|
*/
|
|
static HANDLER_DEF(term_handler)
|
|
{
|
|
WORD fs, gs;
|
|
init_handler( HANDLER_CONTEXT, &fs, &gs );
|
|
server_abort_thread(0);
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* usr1_handler
|
|
*
|
|
* Handler for SIGUSR1, used to signal a thread that it got suspended.
|
|
*/
|
|
static HANDLER_DEF(usr1_handler)
|
|
{
|
|
WORD fs, gs;
|
|
CONTEXT context;
|
|
|
|
init_handler( HANDLER_CONTEXT, &fs, &gs );
|
|
save_context( &context, HANDLER_CONTEXT, fs, gs );
|
|
wait_suspend( &context );
|
|
restore_context( &context, HANDLER_CONTEXT );
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* get_signal_stack_total_size
|
|
*
|
|
* Retrieve the size to allocate for the signal stack, including the TEB at the bottom.
|
|
* Must be a power of two.
|
|
*/
|
|
size_t get_signal_stack_total_size(void)
|
|
{
|
|
static const size_t teb_size = 4096; /* we reserve one page for the TEB */
|
|
|
|
if (!signal_stack_size)
|
|
{
|
|
size_t size = 4096, min_size = teb_size + max( MINSIGSTKSZ, 4096 );
|
|
/* find the first power of two not smaller than min_size */
|
|
while (size < min_size) size *= 2;
|
|
signal_stack_mask = size - 1;
|
|
signal_stack_size = size - teb_size;
|
|
}
|
|
return signal_stack_size + teb_size;
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* set_handler
|
|
*
|
|
* Set a signal handler
|
|
*/
|
|
static int set_handler( int sig, int have_sigaltstack, void (*func)() )
|
|
{
|
|
struct sigaction sig_act;
|
|
|
|
#ifdef linux
|
|
if (!have_sigaltstack)
|
|
{
|
|
struct kernel_sigaction sig_act;
|
|
sig_act.ksa_handler = func;
|
|
sig_act.ksa_flags = SA_RESTART;
|
|
sig_act.ksa_mask = (1 << (SIGINT-1)) |
|
|
(1 << (SIGUSR1-1)) |
|
|
(1 << (SIGUSR2-1));
|
|
/* point to the top of the signal stack */
|
|
sig_act.ksa_restorer = (char *)get_signal_stack() + signal_stack_size;
|
|
return wine_sigaction( sig, &sig_act, NULL );
|
|
}
|
|
#endif /* linux */
|
|
sig_act.sa_handler = func;
|
|
sigemptyset( &sig_act.sa_mask );
|
|
sigaddset( &sig_act.sa_mask, SIGINT );
|
|
sigaddset( &sig_act.sa_mask, SIGUSR1 );
|
|
sigaddset( &sig_act.sa_mask, SIGUSR2 );
|
|
|
|
#if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
|
|
sig_act.sa_flags = SA_RESTART;
|
|
#elif defined (__svr4__) || defined(_SCO_DS) || defined(__APPLE__)
|
|
sig_act.sa_flags = SA_SIGINFO | SA_RESTART;
|
|
#else
|
|
sig_act.sa_flags = 0;
|
|
#endif
|
|
|
|
#ifdef SA_ONSTACK
|
|
if (have_sigaltstack) sig_act.sa_flags |= SA_ONSTACK;
|
|
#endif
|
|
return sigaction( sig, &sig_act, NULL );
|
|
}
|
|
|
|
|
|
/***********************************************************************
|
|
* __wine_set_signal_handler (NTDLL.@)
|
|
*/
|
|
int __wine_set_signal_handler(unsigned int sig, wine_signal_handler wsh)
|
|
{
|
|
if (sig >= sizeof(handlers) / sizeof(handlers[0])) return -1;
|
|
if (handlers[sig] != NULL) return -2;
|
|
handlers[sig] = wsh;
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**********************************************************************
|
|
* SIGNAL_Init
|
|
*/
|
|
BOOL SIGNAL_Init(void)
|
|
{
|
|
int have_sigaltstack = 0;
|
|
|
|
#ifdef HAVE_SIGALTSTACK
|
|
struct sigaltstack ss;
|
|
ss.ss_sp = get_signal_stack();
|
|
ss.ss_size = signal_stack_size;
|
|
ss.ss_flags = 0;
|
|
if (!sigaltstack(&ss, NULL)) have_sigaltstack = 1;
|
|
#ifdef linux
|
|
/* sigaltstack may fail because the kernel is too old, or
|
|
because glibc is brain-dead. In the latter case a
|
|
direct system call should succeed. */
|
|
else if (!wine_sigaltstack(&ss, NULL)) have_sigaltstack = 1;
|
|
#endif /* linux */
|
|
#endif /* HAVE_SIGALTSTACK */
|
|
|
|
if (set_handler( SIGINT, have_sigaltstack, (void (*)())int_handler ) == -1) goto error;
|
|
if (set_handler( SIGFPE, have_sigaltstack, (void (*)())fpe_handler ) == -1) goto error;
|
|
if (set_handler( SIGSEGV, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
|
|
if (set_handler( SIGILL, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
|
|
if (set_handler( SIGABRT, have_sigaltstack, (void (*)())abrt_handler ) == -1) goto error;
|
|
if (set_handler( SIGTERM, have_sigaltstack, (void (*)())term_handler ) == -1) goto error;
|
|
if (set_handler( SIGUSR1, have_sigaltstack, (void (*)())usr1_handler ) == -1) goto error;
|
|
#ifdef SIGBUS
|
|
if (set_handler( SIGBUS, have_sigaltstack, (void (*)())segv_handler ) == -1) goto error;
|
|
#endif
|
|
#ifdef SIGTRAP
|
|
if (set_handler( SIGTRAP, have_sigaltstack, (void (*)())trap_handler ) == -1) goto error;
|
|
#endif
|
|
|
|
#ifdef __HAVE_VM86
|
|
if (set_handler( SIGUSR2, have_sigaltstack, (void (*)())usr2_handler ) == -1) goto error;
|
|
#endif
|
|
|
|
return TRUE;
|
|
|
|
error:
|
|
perror("sigaction");
|
|
return FALSE;
|
|
}
|
|
|
|
|
|
#ifdef __HAVE_VM86
|
|
/**********************************************************************
|
|
* __wine_enter_vm86 (NTDLL.@)
|
|
*
|
|
* Enter vm86 mode with the specified register context.
|
|
*/
|
|
void __wine_enter_vm86( CONTEXT *context )
|
|
{
|
|
EXCEPTION_RECORD rec;
|
|
int res;
|
|
struct vm86plus_struct vm86;
|
|
|
|
memset( &vm86, 0, sizeof(vm86) );
|
|
for (;;)
|
|
{
|
|
restore_vm86_context( context, &vm86 );
|
|
|
|
ntdll_get_thread_data()->vm86_ptr = &vm86;
|
|
merge_vm86_pending_flags( &rec );
|
|
|
|
res = vm86_enter( &ntdll_get_thread_data()->vm86_ptr ); /* uses and clears teb->vm86_ptr */
|
|
if (res < 0)
|
|
{
|
|
errno = -res;
|
|
return;
|
|
}
|
|
|
|
save_vm86_context( context, &vm86 );
|
|
|
|
rec.ExceptionFlags = EXCEPTION_CONTINUABLE;
|
|
rec.ExceptionRecord = NULL;
|
|
rec.ExceptionAddress = (LPVOID)context->Eip;
|
|
rec.NumberParameters = 0;
|
|
|
|
switch(VM86_TYPE(res))
|
|
{
|
|
case VM86_UNKNOWN: /* unhandled GP fault - IO-instruction or similar */
|
|
rec.ExceptionCode = EXCEPTION_PRIV_INSTRUCTION;
|
|
raise_segv_exception( &rec, context );
|
|
continue;
|
|
case VM86_TRAP: /* return due to DOS-debugger request */
|
|
switch(VM86_ARG(res))
|
|
{
|
|
case TRAP_x86_TRCTRAP: /* Single-step exception */
|
|
rec.ExceptionCode = EXCEPTION_SINGLE_STEP;
|
|
break;
|
|
case TRAP_x86_BPTFLT: /* Breakpoint exception */
|
|
rec.ExceptionAddress = (char *)rec.ExceptionAddress - 1; /* back up over the int3 instruction */
|
|
/* fall through */
|
|
default:
|
|
rec.ExceptionCode = EXCEPTION_BREAKPOINT;
|
|
break;
|
|
}
|
|
break;
|
|
case VM86_INTx: /* int3/int x instruction (ARG = x) */
|
|
rec.ExceptionCode = EXCEPTION_VM86_INTx;
|
|
rec.NumberParameters = 1;
|
|
rec.ExceptionInformation[0] = VM86_ARG(res);
|
|
break;
|
|
case VM86_STI: /* sti/popf/iret instruction enabled virtual interrupts */
|
|
context->EFlags |= VIF_MASK;
|
|
context->EFlags &= ~VIP_MASK;
|
|
NtCurrentTeb()->vm86_pending = 0;
|
|
rec.ExceptionCode = EXCEPTION_VM86_STI;
|
|
break;
|
|
case VM86_PICRETURN: /* return due to pending PIC request */
|
|
rec.ExceptionCode = EXCEPTION_VM86_PICRETURN;
|
|
break;
|
|
case VM86_SIGNAL: /* cannot happen because vm86_enter handles this case */
|
|
default:
|
|
ERR( "unhandled result from vm86 mode %x\n", res );
|
|
continue;
|
|
}
|
|
__regs_RtlRaiseException( &rec, context );
|
|
}
|
|
}
|
|
|
|
#else /* __HAVE_VM86 */
|
|
/**********************************************************************
|
|
* __wine_enter_vm86 (NTDLL.@)
|
|
*/
|
|
void __wine_enter_vm86( CONTEXT *context )
|
|
{
|
|
MESSAGE("vm86 mode not supported on this platform\n");
|
|
}
|
|
#endif /* __HAVE_VM86 */
|
|
|
|
/**********************************************************************
|
|
* DbgBreakPoint (NTDLL.@)
|
|
*/
|
|
__ASM_GLOBAL_FUNC( DbgBreakPoint, "int $3; ret");
|
|
|
|
/**********************************************************************
|
|
* DbgUserBreakPoint (NTDLL.@)
|
|
*/
|
|
__ASM_GLOBAL_FUNC( DbgUserBreakPoint, "int $3; ret");
|
|
|
|
|
|
/**********************************************************************
|
|
* EXC_CallHandler (internal)
|
|
*
|
|
* Some exception handlers depend on EBP to have a fixed position relative to
|
|
* the exception frame.
|
|
* Shrinker depends on (*1) doing what it does,
|
|
* (*2) being the exact instruction it is and (*3) beginning with 0x64
|
|
* (i.e. the %fs prefix to the movl instruction). It also depends on the
|
|
* function calling the handler having only 5 parameters (*4).
|
|
*/
|
|
__ASM_GLOBAL_FUNC( EXC_CallHandler,
|
|
" pushl %ebp\n"
|
|
" movl %esp, %ebp\n"
|
|
" subl $4,%esp\n"
|
|
" movl 28(%ebp), %edx\n" /* ugly hack to pass the 6th param needed because of Shrinker */
|
|
" pushl 24(%ebp)\n"
|
|
" pushl 20(%ebp)\n"
|
|
" pushl 16(%ebp)\n"
|
|
" pushl 12(%ebp)\n"
|
|
" pushl 8(%ebp)\n"
|
|
" call " __ASM_NAME("call_exception_handler") "\n"
|
|
" leave\n"
|
|
" ret\n"
|
|
);
|
|
__ASM_GLOBAL_FUNC(call_exception_handler,
|
|
" pushl %ebp\n"
|
|
" movl %esp, %ebp\n"
|
|
" subl $12,%esp\n"
|
|
" pushl 12(%ebp)\n" /* make any exceptions in this... */
|
|
" pushl %edx\n" /* handler be handled by... */
|
|
" .byte 0x64\n"
|
|
" pushl (0)\n" /* nested_handler (passed in edx). */
|
|
" .byte 0x64\n"
|
|
" movl %esp,(0)\n" /* push the new exception frame onto the exception stack. */
|
|
" pushl 20(%ebp)\n"
|
|
" pushl 16(%ebp)\n"
|
|
" pushl 12(%ebp)\n"
|
|
" pushl 8(%ebp)\n"
|
|
" movl 24(%ebp), %ecx\n" /* (*1) */
|
|
" call *%ecx\n" /* call handler. (*2) */
|
|
" .byte 0x64\n"
|
|
" movl (0), %esp\n" /* restore previous... (*3) */
|
|
" .byte 0x64\n"
|
|
" popl (0)\n" /* exception frame. */
|
|
" movl %ebp, %esp\n" /* restore saved stack, in case it was corrupted */
|
|
" popl %ebp\n"
|
|
" ret $20\n" /* (*4) */
|
|
);
|
|
#endif /* __i386__ */
|