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Sweden-Number/server/context_i386.c

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/*
* i386 register context support
*
* Copyright (C) 1999 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#ifdef __i386__
#include <assert.h>
#include <errno.h>
#ifdef HAVE_SYS_REG_H
#include <sys/reg.h>
#endif
#include <stdarg.h>
#include <unistd.h>
#ifdef HAVE_SYS_PTRACE_H
# include <sys/ptrace.h>
#endif
#ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
#endif
#include "windef.h"
#include "file.h"
#include "thread.h"
#include "request.h"
#ifndef PTRACE_PEEKUSER
# ifdef PTRACE_PEEKUSR /* libc5 uses USR not USER */
# define PTRACE_PEEKUSER PTRACE_PEEKUSR
# else
# define PTRACE_PEEKUSER PT_READ_U
# endif
#endif
#ifndef PTRACE_POKEUSER
# ifdef PTRACE_POKEUSR /* libc5 uses USR not USER */
# define PTRACE_POKEUSER PTRACE_POKEUSR
# else
# define PTRACE_POKEUSER PT_WRITE_U
# endif
#endif
#ifndef PTRACE_GETREGS
#define PTRACE_GETREGS PT_GETREGS
#endif
#ifndef PTRACE_GETFPREGS
#define PTRACE_GETFPREGS PT_GETFPREGS
#endif
#ifndef PTRACE_SETREGS
#define PTRACE_SETREGS PT_SETREGS
#endif
#ifndef PTRACE_SETFPREGS
#define PTRACE_SETFPREGS PT_SETFPREGS
#endif
#ifdef PT_GETDBREGS
#define PTRACE_GETDBREGS PT_GETDBREGS
#endif
#ifdef PT_SETDBREGS
#define PTRACE_SETDBREGS PT_SETDBREGS
#endif
#ifdef linux
#ifdef HAVE_SYS_USER_H
# include <sys/user.h>
#endif
/* user_regs definitions from asm/user.h */
struct kernel_user_regs_struct
{
long ebx, ecx, edx, esi, edi, ebp, eax;
unsigned short ds, __ds, es, __es;
unsigned short fs, __fs, gs, __gs;
long orig_eax, eip;
unsigned short cs, __cs;
long eflags, esp;
unsigned short ss, __ss;
};
/* debug register offset in struct user */
#define DR_OFFSET(dr) ((int)((((struct user *)0)->u_debugreg) + (dr)))
/* retrieve a debug register */
static inline int get_debug_reg( int pid, int num, DWORD *data )
{
int res;
errno = 0;
res = ptrace( PTRACE_PEEKUSER, pid, DR_OFFSET(num), 0 );
if ((res == -1) && errno)
{
file_set_error();
return -1;
}
*data = res;
return 0;
}
/* retrieve a thread context */
static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
{
int pid = get_ptrace_pid(thread);
if (flags & CONTEXT_FULL)
{
struct kernel_user_regs_struct regs;
if (ptrace( PTRACE_GETREGS, pid, 0, &regs ) == -1) goto error;
if (flags & CONTEXT_INTEGER)
{
context->Eax = regs.eax;
context->Ebx = regs.ebx;
context->Ecx = regs.ecx;
context->Edx = regs.edx;
context->Esi = regs.esi;
context->Edi = regs.edi;
}
if (flags & CONTEXT_CONTROL)
{
context->Ebp = regs.ebp;
context->Esp = regs.esp;
context->Eip = regs.eip;
context->SegCs = regs.cs;
context->SegSs = regs.ss;
context->EFlags = regs.eflags;
}
if (flags & CONTEXT_SEGMENTS)
{
context->SegDs = regs.ds;
context->SegEs = regs.es;
context->SegFs = regs.fs;
context->SegGs = regs.gs;
}
context->ContextFlags |= flags & CONTEXT_FULL;
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
if (get_debug_reg( pid, 0, &context->Dr0 ) == -1) goto error;
if (get_debug_reg( pid, 1, &context->Dr1 ) == -1) goto error;
if (get_debug_reg( pid, 2, &context->Dr2 ) == -1) goto error;
if (get_debug_reg( pid, 3, &context->Dr3 ) == -1) goto error;
if (get_debug_reg( pid, 6, &context->Dr6 ) == -1) goto error;
if (get_debug_reg( pid, 7, &context->Dr7 ) == -1) goto error;
context->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
}
if (flags & CONTEXT_FLOATING_POINT)
{
/* we can use context->FloatSave directly as it is using the */
/* correct structure (the same as fsave/frstor) */
if (ptrace( PTRACE_GETFPREGS, pid, 0, &context->FloatSave ) == -1) goto error;
context->FloatSave.Cr0NpxState = 0; /* FIXME */
context->ContextFlags |= CONTEXT_FLOATING_POINT;
}
return;
error:
file_set_error();
}
/* set a thread context */
static void set_thread_context_ptrace( struct thread *thread, unsigned int flags, const CONTEXT *context )
{
int pid = get_ptrace_pid(thread);
if (flags & CONTEXT_FULL)
{
struct kernel_user_regs_struct regs;
/* need to preserve some registers (at a minimum orig_eax must always be preserved) */
if (ptrace( PTRACE_GETREGS, pid, 0, &regs ) == -1) goto error;
if (flags & CONTEXT_INTEGER)
{
regs.eax = context->Eax;
regs.ebx = context->Ebx;
regs.ecx = context->Ecx;
regs.edx = context->Edx;
regs.esi = context->Esi;
regs.edi = context->Edi;
}
if (flags & CONTEXT_CONTROL)
{
regs.ebp = context->Ebp;
regs.esp = context->Esp;
regs.eip = context->Eip;
regs.cs = context->SegCs;
regs.ss = context->SegSs;
regs.eflags = context->EFlags;
}
if (flags & CONTEXT_SEGMENTS)
{
regs.ds = context->SegDs;
regs.es = context->SegEs;
regs.fs = context->SegFs;
regs.gs = context->SegGs;
}
if (ptrace( PTRACE_SETREGS, pid, 0, &regs ) == -1) goto error;
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->Dr0 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->Dr1 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->Dr2 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(3), context->Dr3 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(6), context->Dr6 ) == -1) goto error;
if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->Dr7 ) == -1) goto error;
}
if (flags & CONTEXT_FLOATING_POINT)
{
/* we can use context->FloatSave directly as it is using the */
/* correct structure (the same as fsave/frstor) */
if (ptrace( PTRACE_SETFPREGS, pid, 0, &context->FloatSave ) == -1) goto error;
}
return;
error:
file_set_error();
}
#elif defined(__sun) || defined(__sun__)
/* retrieve a thread context */
static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
{
int pid = get_ptrace_pid(thread);
if (flags & CONTEXT_FULL)
{
struct regs regs;
if (ptrace( PTRACE_GETREGS, pid, (int) &regs, 0 ) == -1) goto error;
if (flags & CONTEXT_INTEGER)
{
context->Eax = regs.r_eax;
context->Ebx = regs.r_ebx;
context->Ecx = regs.r_ecx;
context->Edx = regs.r_edx;
context->Esi = regs.r_esi;
context->Edi = regs.r_edi;
}
if (flags & CONTEXT_CONTROL)
{
context->Ebp = regs.r_ebp;
context->Esp = regs.r_esp;
context->Eip = regs.r_eip;
context->SegCs = regs.r_cs & 0xffff;
context->SegSs = regs.r_ss & 0xffff;
context->EFlags = regs.r_efl;
}
if (flags & CONTEXT_SEGMENTS)
{
context->SegDs = regs.r_ds & 0xffff;
context->SegEs = regs.r_es & 0xffff;
context->SegFs = regs.r_fs & 0xffff;
context->SegGs = regs.r_gs & 0xffff;
}
context->ContextFlags |= flags & CONTEXT_FULL;
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
/* FIXME: How is this done on Solaris? */
}
if (flags & CONTEXT_FLOATING_POINT)
{
/* we can use context->FloatSave directly as it is using the */
/* correct structure (the same as fsave/frstor) */
if (ptrace( PTRACE_GETFPREGS, pid, (int) &context->FloatSave, 0 ) == -1) goto error;
context->FloatSave.Cr0NpxState = 0; /* FIXME */
context->ContextFlags |= CONTEXT_FLOATING_POINT;
}
return;
error:
file_set_error();
}
/* set a thread context */
static void set_thread_context_ptrace( struct thread *thread, unsigned int flags, const CONTEXT *context )
{
int pid = get_ptrace_pid(thread);
if (flags & CONTEXT_FULL)
{
struct regs regs;
if (((flags | CONTEXT_i386) & CONTEXT_FULL) != CONTEXT_FULL)
{
/* need to preserve some registers */
if (ptrace( PTRACE_GETREGS, pid, (int) &regs, 0 ) == -1) goto error;
}
if (flags & CONTEXT_INTEGER)
{
regs.r_eax = context->Eax;
regs.r_ebx = context->Ebx;
regs.r_ecx = context->Ecx;
regs.r_edx = context->Edx;
regs.r_esi = context->Esi;
regs.r_edi = context->Edi;
}
if (flags & CONTEXT_CONTROL)
{
regs.r_ebp = context->Ebp;
regs.r_esp = context->Esp;
regs.r_eip = context->Eip;
regs.r_cs = context->SegCs;
regs.r_ss = context->SegSs;
regs.r_efl = context->EFlags;
}
if (flags & CONTEXT_SEGMENTS)
{
regs.r_ds = context->SegDs;
regs.r_es = context->SegEs;
regs.r_fs = context->SegFs;
regs.r_gs = context->SegGs;
}
if (ptrace( PTRACE_SETREGS, pid, (int) &regs, 0 ) == -1) goto error;
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
/* FIXME: How is this done on Solaris? */
}
if (flags & CONTEXT_FLOATING_POINT)
{
/* we can use context->FloatSave directly as it is using the */
/* correct structure (the same as fsave/frstor) */
if (ptrace( PTRACE_SETFPREGS, pid, (int) &context->FloatSave, 0 ) == -1) goto error;
}
return;
error:
file_set_error();
}
#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
#include <machine/reg.h>
/* retrieve a thread context */
static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
{
int pid = get_ptrace_pid(thread);
if (flags & CONTEXT_FULL)
{
struct reg regs;
if (ptrace( PTRACE_GETREGS, pid, (caddr_t) &regs, 0 ) == -1) goto error;
if (flags & CONTEXT_INTEGER)
{
context->Eax = regs.r_eax;
context->Ebx = regs.r_ebx;
context->Ecx = regs.r_ecx;
context->Edx = regs.r_edx;
context->Esi = regs.r_esi;
context->Edi = regs.r_edi;
}
if (flags & CONTEXT_CONTROL)
{
context->Ebp = regs.r_ebp;
context->Esp = regs.r_esp;
context->Eip = regs.r_eip;
context->SegCs = regs.r_cs & 0xffff;
context->SegSs = regs.r_ss & 0xffff;
context->EFlags = regs.r_eflags;
}
if (flags & CONTEXT_SEGMENTS)
{
context->SegDs = regs.r_ds & 0xffff;
context->SegEs = regs.r_es & 0xffff;
context->SegFs = regs.r_fs & 0xffff;
context->SegGs = regs.r_gs & 0xffff;
}
context->ContextFlags |= flags & CONTEXT_FULL;
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
#ifdef PTRACE_GETDBREGS
struct dbreg dbregs;
if (ptrace( PTRACE_GETDBREGS, pid, (caddr_t) &dbregs, 0 ) == -1)
goto error;
#ifdef DBREG_DRX
/* needed for FreeBSD, the structure fields have changed under 5.x */
context->Dr0 = DBREG_DRX((&dbregs), 0);
context->Dr1 = DBREG_DRX((&dbregs), 1);
context->Dr2 = DBREG_DRX((&dbregs), 2);
context->Dr3 = DBREG_DRX((&dbregs), 3);
context->Dr6 = DBREG_DRX((&dbregs), 6);
context->Dr7 = DBREG_DRX((&dbregs), 7);
#else
context->Dr0 = dbregs.dr0;
context->Dr1 = dbregs.dr1;
context->Dr2 = dbregs.dr2;
context->Dr3 = dbregs.dr3;
context->Dr6 = dbregs.dr6;
context->Dr7 = dbregs.dr7;
#endif
context->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
#endif
}
if (flags & CONTEXT_FLOATING_POINT)
{
/* we can use context->FloatSave directly as it is using the */
/* correct structure (the same as fsave/frstor) */
if (ptrace( PTRACE_GETFPREGS, pid, (caddr_t) &context->FloatSave, 0 ) == -1) goto error;
context->FloatSave.Cr0NpxState = 0; /* FIXME */
context->ContextFlags |= CONTEXT_FLOATING_POINT;
}
return;
error:
file_set_error();
}
/* set a thread context */
static void set_thread_context_ptrace( struct thread *thread, unsigned int flags, const CONTEXT *context )
{
int pid = get_ptrace_pid(thread);
if (flags & CONTEXT_FULL)
{
struct reg regs;
if (((flags | CONTEXT_i386) & CONTEXT_FULL) != CONTEXT_FULL)
{
/* need to preserve some registers */
if (ptrace( PTRACE_GETREGS, pid, (caddr_t) &regs, 0 ) == -1) goto error;
}
if (flags & CONTEXT_INTEGER)
{
regs.r_eax = context->Eax;
regs.r_ebx = context->Ebx;
regs.r_ecx = context->Ecx;
regs.r_edx = context->Edx;
regs.r_esi = context->Esi;
regs.r_edi = context->Edi;
}
if (flags & CONTEXT_CONTROL)
{
regs.r_ebp = context->Ebp;
regs.r_esp = context->Esp;
regs.r_eip = context->Eip;
regs.r_cs = context->SegCs;
regs.r_ss = context->SegSs;
regs.r_eflags = context->EFlags;
}
if (flags & CONTEXT_SEGMENTS)
{
regs.r_ds = context->SegDs;
regs.r_es = context->SegEs;
regs.r_fs = context->SegFs;
regs.r_gs = context->SegGs;
}
if (ptrace( PTRACE_SETREGS, pid, (caddr_t) &regs, 0 ) == -1) goto error;
}
if (flags & CONTEXT_DEBUG_REGISTERS)
{
#ifdef PTRACE_SETDBREGS
struct dbreg dbregs;
#ifdef DBREG_DRX
/* needed for FreeBSD, the structure fields have changed under 5.x */
DBREG_DRX((&dbregs), 0) = context->Dr0;
DBREG_DRX((&dbregs), 1) = context->Dr1;
DBREG_DRX((&dbregs), 2) = context->Dr2;
DBREG_DRX((&dbregs), 3) = context->Dr3;
DBREG_DRX((&dbregs), 4) = 0;
DBREG_DRX((&dbregs), 5) = 0;
DBREG_DRX((&dbregs), 6) = context->Dr6;
DBREG_DRX((&dbregs), 7) = context->Dr7;
#else
dbregs.dr0 = context->Dr0;
dbregs.dr1 = context->Dr1;
dbregs.dr2 = context->Dr2;
dbregs.dr3 = context->Dr3;
dbregs.dr4 = 0;
dbregs.dr5 = 0;
dbregs.dr6 = context->Dr6;
dbregs.dr7 = context->Dr7;
#endif
if (ptrace( PTRACE_SETDBREGS, pid, (caddr_t) &dbregs, 0 ) == -1)
goto error;
#endif
}
if (flags & CONTEXT_FLOATING_POINT)
{
/* we can use context->FloatSave directly as it is using the */
/* correct structure (the same as fsave/frstor) */
if (ptrace( PTRACE_SETFPREGS, pid, (caddr_t) &context->FloatSave, 0 ) == -1) goto error;
}
return;
error:
file_set_error();
}
#else /* linux || __sun__ || __FreeBSD__ */
#error You must implement get/set_thread_context_ptrace for your platform
#endif /* linux || __sun__ || __FreeBSD__ */
/* copy a context structure according to the flags */
static void copy_context( CONTEXT *to, const CONTEXT *from, unsigned int flags )
{
if (flags & CONTEXT_CONTROL)
{
to->Ebp = from->Ebp;
to->Eip = from->Eip;
to->Esp = from->Esp;
to->SegCs = from->SegCs;
to->SegSs = from->SegSs;
to->EFlags = from->EFlags;
}
if (flags & CONTEXT_INTEGER)
{
to->Eax = from->Eax;
to->Ebx = from->Ebx;
to->Ecx = from->Ecx;
to->Edx = from->Edx;
to->Esi = from->Esi;
to->Edi = from->Edi;
}
if (flags & CONTEXT_SEGMENTS)
{
to->SegDs = from->SegDs;
to->SegEs = from->SegEs;
to->SegFs = from->SegFs;
to->SegGs = from->SegGs;
}
if (flags & CONTEXT_FLOATING_POINT)
{
to->FloatSave = from->FloatSave;
}
/* we don't bother copying the debug registers, since they */
/* always need to be accessed by ptrace anyway */
to->ContextFlags |= flags & ~CONTEXT_DEBUG_REGISTERS;
}
/* retrieve the current instruction pointer of a thread */
void *get_thread_ip( struct thread *thread )
{
CONTEXT context;
context.Eip = 0;
if (suspend_for_ptrace( thread ))
{
get_thread_context_ptrace( thread, CONTEXT_CONTROL, &context );
resume_after_ptrace( thread );
}
return (void *)context.Eip;
}
/* determine if we should continue the thread in single-step mode */
int get_thread_single_step( struct thread *thread )
{
CONTEXT context;
if (thread->context) return 0; /* don't single-step inside exception event */
get_thread_context_ptrace( thread, CONTEXT_CONTROL, &context );
return (context.EFlags & 0x100) != 0;
}
/* send a signal to a specific thread */
int tkill( int pid, int sig )
{
#ifdef __linux__
int ret;
__asm__( "pushl %%ebx\n\t"
"movl %2,%%ebx\n\t"
"int $0x80\n\t"
"popl %%ebx\n\t"
: "=a" (ret)
: "0" (238) /*SYS_tkill*/, "r" (pid), "c" (sig) );
if (ret >= 0) return ret;
errno = -ret;
return -1;
#else
errno = ENOSYS;
return -1;
#endif
}
/* retrieve the thread context */
void get_thread_context( struct thread *thread, CONTEXT *context, unsigned int flags )
{
context->ContextFlags |= CONTEXT_i386;
flags &= ~CONTEXT_i386; /* get rid of CPU id */
if (thread->context) /* thread is inside an exception event or suspended */
{
copy_context( context, thread->context, flags );
flags &= CONTEXT_DEBUG_REGISTERS;
}
if (flags && suspend_for_ptrace( thread ))
{
get_thread_context_ptrace( thread, flags, context );
resume_after_ptrace( thread );
}
}
/* set the thread context */
void set_thread_context( struct thread *thread, const CONTEXT *context, unsigned int flags )
{
flags &= ~CONTEXT_i386; /* get rid of CPU id */
if (thread->context) /* thread is inside an exception event or suspended */
copy_context( thread->context, context, flags );
flags &= CONTEXT_DEBUG_REGISTERS; /* the other registers are handled on the client side */
if (flags && suspend_for_ptrace( thread ))
{
set_thread_context_ptrace( thread, flags, context );
resume_after_ptrace( thread );
}
}
#endif /* __i386__ */
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