295 lines
9.0 KiB
C
295 lines
9.0 KiB
C
/*
|
|
* x86-64 register context support
|
|
*
|
|
* Copyright (C) 1999, 2005 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#ifdef __x86_64__
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#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
|
|
|
|
#define NONAMELESSUNION
|
|
#include "windef.h"
|
|
#include "winbase.h"
|
|
|
|
#include "file.h"
|
|
#include "thread.h"
|
|
#include "request.h"
|
|
|
|
#ifdef __linux__
|
|
|
|
#ifdef HAVE_SYS_USER_H
|
|
# include <sys/user.h>
|
|
#endif
|
|
|
|
/* debug register offset in struct user */
|
|
#define DR_OFFSET(dr) ((unsigned long)((((struct user *)0)->u_debugreg) + (dr)))
|
|
|
|
/* retrieve a debug register */
|
|
static inline int get_debug_reg( int pid, int num, DWORD64 *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 user_regs_struct regs;
|
|
if (ptrace( PTRACE_GETREGS, pid, 0, ®s ) == -1) goto error;
|
|
if (flags & CONTEXT_INTEGER)
|
|
{
|
|
context->Rax = regs.rax;
|
|
context->Rbx = regs.rbx;
|
|
context->Rcx = regs.rcx;
|
|
context->Rdx = regs.rdx;
|
|
context->Rsi = regs.rsi;
|
|
context->Rdi = regs.rdi;
|
|
context->R8 = regs.r8;
|
|
context->R9 = regs.r9;
|
|
context->R10 = regs.r10;
|
|
context->R11 = regs.r11;
|
|
context->R12 = regs.r12;
|
|
context->R13 = regs.r13;
|
|
context->R14 = regs.r14;
|
|
context->R15 = regs.r15;
|
|
}
|
|
if (flags & CONTEXT_CONTROL)
|
|
{
|
|
context->Rbp = regs.rbp;
|
|
context->Rsp = regs.rsp;
|
|
context->Rip = regs.rip;
|
|
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->u.FltSave ) == -1) goto error;
|
|
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 user_regs_struct regs;
|
|
|
|
/* need to preserve some registers (at a minimum orig_eax must always be preserved) */
|
|
if (ptrace( PTRACE_GETREGS, pid, 0, ®s ) == -1) goto error;
|
|
|
|
if (flags & CONTEXT_INTEGER)
|
|
{
|
|
regs.rax = context->Rax;
|
|
regs.rbx = context->Rbx;
|
|
regs.rcx = context->Rcx;
|
|
regs.rdx = context->Rdx;
|
|
regs.rsi = context->Rsi;
|
|
regs.rdi = context->Rdi;
|
|
regs.r8 = context->R8;
|
|
regs.r9 = context->R9;
|
|
regs.r10 = context->R10;
|
|
regs.r11 = context->R11;
|
|
regs.r12 = context->R12;
|
|
regs.r13 = context->R13;
|
|
regs.r14 = context->R14;
|
|
regs.r15 = context->R15;
|
|
}
|
|
if (flags & CONTEXT_CONTROL)
|
|
{
|
|
regs.rbp = context->Rbp;
|
|
regs.rip = context->Rip;
|
|
regs.rsp = context->Rsp;
|
|
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, ®s ) == -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->u.FltSave ) == -1) goto error;
|
|
}
|
|
return;
|
|
error:
|
|
file_set_error();
|
|
}
|
|
|
|
#else /* linux */
|
|
#error You must implement get/set_thread_context_ptrace for your platform
|
|
#endif /* linux */
|
|
|
|
|
|
/* 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->Rbp = from->Rbp;
|
|
to->Rip = from->Rip;
|
|
to->Rsp = from->Rsp;
|
|
to->SegCs = from->SegCs;
|
|
to->SegSs = from->SegSs;
|
|
to->EFlags = from->EFlags;
|
|
to->MxCsr = from->MxCsr;
|
|
}
|
|
if (flags & CONTEXT_INTEGER)
|
|
{
|
|
to->Rax = from->Rax;
|
|
to->Rcx = from->Rcx;
|
|
to->Rdx = from->Rdx;
|
|
to->Rbx = from->Rbx;
|
|
to->Rsi = from->Rsi;
|
|
to->Rdi = from->Rdi;
|
|
to->R8 = from->R8;
|
|
to->R9 = from->R9;
|
|
to->R10 = from->R10;
|
|
to->R11 = from->R11;
|
|
to->R12 = from->R12;
|
|
to->R13 = from->R13;
|
|
to->R14 = from->R14;
|
|
to->R15 = from->R15;
|
|
}
|
|
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->u.FltSave = from->u.FltSave;
|
|
}
|
|
/* 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 context */
|
|
void *get_context_ip( const CONTEXT *context )
|
|
{
|
|
return (void *)context->Rip;
|
|
}
|
|
|
|
/* retrieve the thread context */
|
|
void get_thread_context( struct thread *thread, CONTEXT *context, unsigned int flags )
|
|
{
|
|
context->ContextFlags |= CONTEXT_AMD64;
|
|
flags &= ~CONTEXT_AMD64; /* 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_AMD64; /* 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;
|
|
}
|
|
|
|
if (flags && suspend_for_ptrace( thread ))
|
|
{
|
|
set_thread_context_ptrace( thread, flags, context );
|
|
resume_after_ptrace( thread );
|
|
}
|
|
}
|
|
|
|
#endif /* __x86_64__ */
|