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321 lines
9.6 KiB
C
321 lines
9.6 KiB
C
/*
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* x86-64 register context support
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*
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* Copyright (C) 1999, 2005 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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#include "config.h"
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#ifdef __x86_64__
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#include <assert.h>
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#include <errno.h>
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#include <stdarg.h>
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#include <unistd.h>
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#ifdef HAVE_SYS_PTRACE_H
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# include <sys/ptrace.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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#define NONAMELESSUNION
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#include "windef.h"
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#include "winbase.h"
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#include "file.h"
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#include "thread.h"
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#include "request.h"
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#ifdef __linux__
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#ifdef HAVE_SYS_USER_H
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# include <sys/user.h>
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#endif
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/* debug register offset in struct user */
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#define DR_OFFSET(dr) ((unsigned long)((((struct user *)0)->u_debugreg) + (dr)))
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/* retrieve a debug register */
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static inline int get_debug_reg( int pid, int num, DWORD64 *data )
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{
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int res;
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errno = 0;
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res = ptrace( PTRACE_PEEKUSER, pid, DR_OFFSET(num), 0 );
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if ((res == -1) && errno)
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{
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file_set_error();
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return -1;
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}
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*data = res;
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return 0;
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}
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/* retrieve a thread context */
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static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
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{
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int pid = get_ptrace_pid(thread);
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if (flags & CONTEXT_FULL)
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{
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struct user_regs_struct regs;
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if (ptrace( PTRACE_GETREGS, pid, 0, ®s ) == -1) goto error;
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if (flags & CONTEXT_INTEGER)
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{
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context->Rax = regs.rax;
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context->Rbx = regs.rbx;
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context->Rcx = regs.rcx;
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context->Rdx = regs.rdx;
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context->Rsi = regs.rsi;
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context->Rdi = regs.rdi;
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context->R8 = regs.r8;
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context->R9 = regs.r9;
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context->R10 = regs.r10;
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context->R11 = regs.r11;
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context->R12 = regs.r12;
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context->R13 = regs.r13;
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context->R14 = regs.r14;
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context->R15 = regs.r15;
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}
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if (flags & CONTEXT_CONTROL)
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{
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context->Rbp = regs.rbp;
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context->Rsp = regs.rsp;
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context->Rip = regs.rip;
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context->SegCs = regs.cs;
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context->SegSs = regs.ss;
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context->EFlags = regs.eflags;
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}
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if (flags & CONTEXT_SEGMENTS)
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{
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context->SegDs = regs.ds;
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context->SegEs = regs.es;
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context->SegFs = regs.fs;
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context->SegGs = regs.gs;
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}
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}
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if (flags & CONTEXT_DEBUG_REGISTERS)
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{
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if (get_debug_reg( pid, 0, &context->Dr0 ) == -1) goto error;
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if (get_debug_reg( pid, 1, &context->Dr1 ) == -1) goto error;
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if (get_debug_reg( pid, 2, &context->Dr2 ) == -1) goto error;
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if (get_debug_reg( pid, 3, &context->Dr3 ) == -1) goto error;
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if (get_debug_reg( pid, 6, &context->Dr6 ) == -1) goto error;
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if (get_debug_reg( pid, 7, &context->Dr7 ) == -1) goto error;
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}
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if (flags & CONTEXT_FLOATING_POINT)
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{
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/* we can use context->FloatSave directly as it is using the */
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/* correct structure (the same as fsave/frstor) */
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if (ptrace( PTRACE_GETFPREGS, pid, 0, &context->u.FltSave ) == -1) goto error;
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}
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return;
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error:
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file_set_error();
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}
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/* set a thread context */
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static void set_thread_context_ptrace( struct thread *thread, unsigned int flags, const CONTEXT *context )
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{
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int pid = get_ptrace_pid(thread);
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if (flags & CONTEXT_FULL)
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{
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struct user_regs_struct regs;
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/* need to preserve some registers (at a minimum orig_eax must always be preserved) */
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if (ptrace( PTRACE_GETREGS, pid, 0, ®s ) == -1) goto error;
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if (flags & CONTEXT_INTEGER)
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{
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regs.rax = context->Rax;
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regs.rbx = context->Rbx;
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regs.rcx = context->Rcx;
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regs.rdx = context->Rdx;
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regs.rsi = context->Rsi;
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regs.rdi = context->Rdi;
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regs.r8 = context->R8;
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regs.r9 = context->R9;
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regs.r10 = context->R10;
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regs.r11 = context->R11;
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regs.r12 = context->R12;
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regs.r13 = context->R13;
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regs.r14 = context->R14;
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regs.r15 = context->R15;
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}
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if (flags & CONTEXT_CONTROL)
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{
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regs.rbp = context->Rbp;
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regs.rip = context->Rip;
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regs.rsp = context->Rsp;
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regs.cs = context->SegCs;
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regs.ss = context->SegSs;
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regs.eflags = context->EFlags;
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}
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if (flags & CONTEXT_SEGMENTS)
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{
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regs.ds = context->SegDs;
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regs.es = context->SegEs;
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regs.fs = context->SegFs;
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regs.gs = context->SegGs;
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}
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if (ptrace( PTRACE_SETREGS, pid, 0, ®s ) == -1) goto error;
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}
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if (flags & CONTEXT_DEBUG_REGISTERS)
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{
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if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(0), context->Dr0 ) == -1) goto error;
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if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(1), context->Dr1 ) == -1) goto error;
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if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(2), context->Dr2 ) == -1) goto error;
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if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(3), context->Dr3 ) == -1) goto error;
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if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(6), context->Dr6 ) == -1) goto error;
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if (ptrace( PTRACE_POKEUSER, pid, DR_OFFSET(7), context->Dr7 ) == -1) goto error;
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}
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if (flags & CONTEXT_FLOATING_POINT)
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{
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/* we can use context->FloatSave directly as it is using the */
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/* correct structure (the same as fsave/frstor) */
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if (ptrace( PTRACE_SETFPREGS, pid, 0, &context->u.FltSave ) == -1) goto error;
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}
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return;
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error:
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file_set_error();
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}
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#else /* linux */
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#error You must implement get/set_thread_context_ptrace for your platform
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#endif /* linux */
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/* copy a context structure according to the flags */
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static void copy_context( CONTEXT *to, const CONTEXT *from, int flags )
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{
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if (flags & CONTEXT_CONTROL)
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{
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to->Rbp = from->Rbp;
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to->Rip = from->Rip;
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to->Rsp = from->Rsp;
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to->SegCs = from->SegCs;
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to->SegSs = from->SegSs;
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to->EFlags = from->EFlags;
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to->MxCsr = from->MxCsr;
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}
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if (flags & CONTEXT_INTEGER)
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{
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to->Rax = from->Rax;
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to->Rcx = from->Rcx;
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to->Rdx = from->Rdx;
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to->Rbx = from->Rbx;
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to->Rsi = from->Rsi;
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to->Rdi = from->Rdi;
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to->R8 = from->R8;
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to->R9 = from->R9;
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to->R10 = from->R10;
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to->R11 = from->R11;
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to->R12 = from->R12;
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to->R13 = from->R13;
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to->R14 = from->R14;
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to->R15 = from->R15;
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}
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if (flags & CONTEXT_SEGMENTS)
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{
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to->SegDs = from->SegDs;
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to->SegEs = from->SegEs;
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to->SegFs = from->SegFs;
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to->SegGs = from->SegGs;
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}
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if (flags & CONTEXT_FLOATING_POINT)
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{
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to->u.FltSave = from->u.FltSave;
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}
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/* we don't bother copying the debug registers, since they */
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/* always need to be accessed by ptrace anyway */
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}
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/* retrieve the current instruction pointer of a thread */
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void *get_thread_ip( struct thread *thread )
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{
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CONTEXT context;
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context.Rip = 0;
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if (suspend_for_ptrace( thread ))
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{
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get_thread_context_ptrace( thread, CONTEXT_CONTROL, &context );
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resume_after_ptrace( thread );
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}
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return (void *)context.Rip;
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}
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/* determine if we should continue the thread in single-step mode */
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int get_thread_single_step( struct thread *thread )
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{
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CONTEXT context;
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if (thread->context) return 0; /* don't single-step inside exception event */
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get_thread_context_ptrace( thread, CONTEXT_CONTROL, &context );
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return (context.EFlags & 0x100) != 0;
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}
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/* send a signal to a specific thread */
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int tkill( int pid, int sig )
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{
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#ifdef __linux__
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int ret;
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__asm__( "syscall" : "=a" (ret)
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: "0" (200) /*SYS_tkill*/, "D" (pid), "S" (sig) );
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if (ret >= 0) return ret;
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errno = -ret;
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return -1;
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#else
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errno = ENOSYS;
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return -1;
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#endif
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}
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/* retrieve the thread context */
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void get_thread_context( struct thread *thread, CONTEXT *context, unsigned int flags )
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{
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flags &= ~CONTEXT_AMD64; /* get rid of CPU id */
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if (thread->context) /* thread is inside an exception event or suspended */
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{
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copy_context( context, thread->context, flags );
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flags &= CONTEXT_DEBUG_REGISTERS;
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}
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if (flags && suspend_for_ptrace( thread ))
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{
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get_thread_context_ptrace( thread, flags, context );
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resume_after_ptrace( thread );
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}
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}
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/* set the thread context */
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void set_thread_context( struct thread *thread, const CONTEXT *context, unsigned int flags )
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{
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flags &= ~CONTEXT_AMD64; /* get rid of CPU id */
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if (thread->context) /* thread is inside an exception event or suspended */
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{
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copy_context( thread->context, context, flags );
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flags &= CONTEXT_DEBUG_REGISTERS;
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}
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if (flags && suspend_for_ptrace( thread ))
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{
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set_thread_context_ptrace( thread, flags, context );
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resume_after_ptrace( thread );
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}
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}
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#endif /* __x86_64__ */
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