2 * x86-64 register context support
4 * Copyright (C) 1999, 2005 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 #ifdef HAVE_SYS_PTRACE_H
30 # include <sys/ptrace.h>
32 #ifdef HAVE_SYS_PARAM_H
33 # include <sys/param.h>
36 #define NONAMELESSUNION
46 #ifdef HAVE_SYS_USER_H
47 # include <sys/user.h>
50 /* debug register offset in struct user */
51 #define DR_OFFSET(dr) ((unsigned long)((((struct user *)0)->u_debugreg) + (dr)))
53 /* retrieve a debug register */
54 static inline int get_debug_reg( int pid, int num, DWORD64 *data )
58 res = ptrace( PTRACE_PEEKUSER, pid, DR_OFFSET(num), 0 );
59 if ((res == -1) && errno)
68 /* retrieve a thread context */
69 static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
71 int pid = get_ptrace_pid(thread);
72 if (flags & CONTEXT_FULL)
74 struct user_regs_struct regs;
75 if (ptrace( PTRACE_GETREGS, pid, 0, ®s ) == -1) goto error;
76 if (flags & CONTEXT_INTEGER)
78 context->Rax = regs.rax;
79 context->Rbx = regs.rbx;
80 context->Rcx = regs.rcx;
81 context->Rdx = regs.rdx;
82 context->Rsi = regs.rsi;
83 context->Rdi = regs.rdi;
84 context->R8 = regs.r8;
85 context->R9 = regs.r9;
86 context->R10 = regs.r10;
87 context->R11 = regs.r11;
88 context->R12 = regs.r12;
89 context->R13 = regs.r13;
90 context->R14 = regs.r14;
91 context->R15 = regs.r15;
93 if (flags & CONTEXT_CONTROL)
95 context->Rbp = regs.rbp;
96 context->Rsp = regs.rsp;
97 context->Rip = regs.rip;
98 context->SegCs = regs.cs;
99 context->SegSs = regs.ss;
100 context->EFlags = regs.eflags;
102 if (flags & CONTEXT_SEGMENTS)
104 context->SegDs = regs.ds;
105 context->SegEs = regs.es;
106 context->SegFs = regs.fs;
107 context->SegGs = regs.gs;
110 if (flags & CONTEXT_DEBUG_REGISTERS)
112 if (get_debug_reg( pid, 0, &context->Dr0 ) == -1) goto error;
113 if (get_debug_reg( pid, 1, &context->Dr1 ) == -1) goto error;
114 if (get_debug_reg( pid, 2, &context->Dr2 ) == -1) goto error;
115 if (get_debug_reg( pid, 3, &context->Dr3 ) == -1) goto error;
116 if (get_debug_reg( pid, 6, &context->Dr6 ) == -1) goto error;
117 if (get_debug_reg( pid, 7, &context->Dr7 ) == -1) goto error;
119 if (flags & CONTEXT_FLOATING_POINT)
121 /* we can use context->FloatSave directly as it is using the */
122 /* correct structure (the same as fsave/frstor) */
123 if (ptrace( PTRACE_GETFPREGS, pid, 0, &context->u.FltSave ) == -1) goto error;
131 /* set a thread context */
132 static void set_thread_context_ptrace( struct thread *thread, unsigned int flags, const CONTEXT *context )
134 int pid = get_ptrace_pid(thread);
135 if (flags & CONTEXT_FULL)
137 struct user_regs_struct regs;
139 /* need to preserve some registers (at a minimum orig_eax must always be preserved) */
140 if (ptrace( PTRACE_GETREGS, pid, 0, ®s ) == -1) goto error;
142 if (flags & CONTEXT_INTEGER)
144 regs.rax = context->Rax;
145 regs.rbx = context->Rbx;
146 regs.rcx = context->Rcx;
147 regs.rdx = context->Rdx;
148 regs.rsi = context->Rsi;
149 regs.rdi = context->Rdi;
150 regs.r8 = context->R8;
151 regs.r9 = context->R9;
152 regs.r10 = context->R10;
153 regs.r11 = context->R11;
154 regs.r12 = context->R12;
155 regs.r13 = context->R13;
156 regs.r14 = context->R14;
157 regs.r15 = context->R15;
159 if (flags & CONTEXT_CONTROL)
161 regs.rbp = context->Rbp;
162 regs.rip = context->Rip;
163 regs.rsp = context->Rsp;
164 regs.cs = context->SegCs;
165 regs.ss = context->SegSs;
166 regs.eflags = context->EFlags;
168 if (flags & CONTEXT_SEGMENTS)
170 regs.ds = context->SegDs;
171 regs.es = context->SegEs;
172 regs.fs = context->SegFs;
173 regs.gs = context->SegGs;
175 if (ptrace( PTRACE_SETREGS, pid, 0, ®s ) == -1) goto error;
177 if (flags & CONTEXT_DEBUG_REGISTERS)
179 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->Dr0 ) == -1) goto error;
180 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->Dr1 ) == -1) goto error;
181 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->Dr2 ) == -1) goto error;
182 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(3), context->Dr3 ) == -1) goto error;
183 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(6), context->Dr6 ) == -1) goto error;
184 if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->Dr7 ) == -1) goto error;
186 if (flags & CONTEXT_FLOATING_POINT)
188 /* we can use context->FloatSave directly as it is using the */
189 /* correct structure (the same as fsave/frstor) */
190 if (ptrace( PTRACE_SETFPREGS, pid, 0, &context->u.FltSave ) == -1) goto error;
198 #error You must implement get/set_thread_context_ptrace for your platform
202 /* copy a context structure according to the flags */
203 static void copy_context( CONTEXT *to, const CONTEXT *from, int flags )
205 if (flags & CONTEXT_CONTROL)
210 to->SegCs = from->SegCs;
211 to->SegSs = from->SegSs;
212 to->EFlags = from->EFlags;
213 to->MxCsr = from->MxCsr;
215 if (flags & CONTEXT_INTEGER)
232 if (flags & CONTEXT_SEGMENTS)
234 to->SegDs = from->SegDs;
235 to->SegEs = from->SegEs;
236 to->SegFs = from->SegFs;
237 to->SegGs = from->SegGs;
239 if (flags & CONTEXT_FLOATING_POINT)
241 to->u.FltSave = from->u.FltSave;
243 /* we don't bother copying the debug registers, since they */
244 /* always need to be accessed by ptrace anyway */
247 /* retrieve the current instruction pointer of a thread */
248 void *get_thread_ip( struct thread *thread )
252 if (suspend_for_ptrace( thread ))
254 get_thread_context_ptrace( thread, CONTEXT_CONTROL, &context );
255 resume_after_ptrace( thread );
257 return (void *)context.Rip;
260 /* determine if we should continue the thread in single-step mode */
261 int get_thread_single_step( struct thread *thread )
264 if (thread->context) return 0; /* don't single-step inside exception event */
265 get_thread_context_ptrace( thread, CONTEXT_CONTROL, &context );
266 return (context.EFlags & 0x100) != 0;
269 /* send a signal to a specific thread */
270 int tkill( int pid, int sig )
274 __asm__( "syscall" : "=a" (ret)
275 : "0" (200) /*SYS_tkill*/, "D" (pid), "S" (sig) );
276 if (ret >= 0) return ret;
285 /* retrieve the thread context */
286 void get_thread_context( struct thread *thread, CONTEXT *context, unsigned int flags )
288 flags &= ~CONTEXT_AMD64; /* get rid of CPU id */
290 if (thread->context) /* thread is inside an exception event or suspended */
292 copy_context( context, thread->context, flags );
293 flags &= CONTEXT_DEBUG_REGISTERS;
296 if (flags && suspend_for_ptrace( thread ))
298 get_thread_context_ptrace( thread, flags, context );
299 resume_after_ptrace( thread );
303 /* set the thread context */
304 void set_thread_context( struct thread *thread, const CONTEXT *context, unsigned int flags )
306 flags &= ~CONTEXT_AMD64; /* get rid of CPU id */
308 if (thread->context) /* thread is inside an exception event or suspended */
310 copy_context( thread->context, context, flags );
311 flags &= CONTEXT_DEBUG_REGISTERS;
314 if (flags && suspend_for_ptrace( thread ))
316 set_thread_context_ptrace( thread, flags, context );
317 resume_after_ptrace( thread );
321 #endif /* __x86_64__ */