541 lines
16 KiB
C
541 lines
16 KiB
C
/*
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* i386 register context support
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*
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* Copyright (C) 1999 Alexandre Julliard
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*/
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#include "config.h"
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#ifdef __i386__
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#include <assert.h>
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#include <errno.h>
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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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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#ifdef HAVE_SYS_USER_H
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# include <sys/user.h>
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#endif
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#include "winbase.h"
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#include "thread.h"
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#include "request.h"
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#ifndef PTRACE_PEEKUSER
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# ifdef PTRACE_PEEKUSR /* libc5 uses USR not USER */
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# define PTRACE_PEEKUSER PTRACE_PEEKUSR
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# else
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# define PTRACE_PEEKUSER PT_READ_U
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# endif
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#endif
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#ifndef PTRACE_POKEUSER
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# ifdef PTRACE_POKEUSR /* libc5 uses USR not USER */
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# define PTRACE_POKEUSER PTRACE_POKEUSR
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# else
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# define PTRACE_POKEUSER PT_WRITE_U
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# endif
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#endif
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#ifndef PTRACE_GETREGS
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#define PTRACE_GETREGS PT_GETREGS
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#endif
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#ifndef PTRACE_GETFPREGS
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#define PTRACE_GETFPREGS PT_GETFPREGS
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#endif
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#ifndef PTRACE_SETREGS
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#define PTRACE_SETREGS PT_SETREGS
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#endif
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#ifndef PTRACE_SETFPREGS
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#define PTRACE_SETFPREGS PT_SETFPREGS
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#endif
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#ifdef linux
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/* user_regs definitions from asm/user.h */
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struct kernel_user_regs_struct
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{
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long ebx, ecx, edx, esi, edi, ebp, eax;
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unsigned short ds, __ds, es, __es;
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unsigned short fs, __fs, gs, __gs;
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long orig_eax, eip;
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unsigned short cs, __cs;
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long eflags, esp;
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unsigned short ss, __ss;
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};
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/* debug register offset in struct user */
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#define DR_OFFSET(dr) ((int)((((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, DWORD *data )
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{
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int 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( struct thread *thread, unsigned int flags, CONTEXT *context )
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{
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int pid = thread->unix_pid;
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if (flags & CONTEXT_FULL)
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{
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struct kernel_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->Eax = regs.eax;
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context->Ebx = regs.ebx;
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context->Ecx = regs.ecx;
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context->Edx = regs.edx;
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context->Esi = regs.esi;
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context->Edi = regs.edi;
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}
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if (flags & CONTEXT_CONTROL)
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{
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context->Ebp = regs.ebp;
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context->Esp = regs.esp;
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context->Eip = regs.eip;
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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->FloatSave ) == -1) goto error;
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context->FloatSave.Cr0NpxState = 0; /* FIXME */
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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( struct thread *thread, unsigned int flags, CONTEXT *context )
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{
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int pid = thread->unix_pid;
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if (flags & CONTEXT_FULL)
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{
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struct kernel_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.eax = context->Eax;
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regs.ebx = context->Ebx;
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regs.ecx = context->Ecx;
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regs.edx = context->Edx;
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regs.esi = context->Esi;
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regs.edi = context->Edi;
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}
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if (flags & CONTEXT_CONTROL)
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{
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regs.ebp = context->Ebp;
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regs.esp = context->Esp;
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regs.eip = context->Eip;
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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->FloatSave ) == -1) goto error;
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context->FloatSave.Cr0NpxState = 0; /* FIXME */
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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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#elif defined(__sun) || defined(__sun__)
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/* retrieve a thread context */
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static void get_thread_context( struct thread *thread, unsigned int flags, CONTEXT *context )
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{
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int pid = thread->unix_pid;
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if (flags & CONTEXT_FULL)
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{
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struct regs regs;
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if (ptrace( PTRACE_GETREGS, pid, 0, (int) ®s ) == -1) goto error;
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if (flags & CONTEXT_INTEGER)
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{
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context->Eax = regs.r_eax;
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context->Ebx = regs.r_ebx;
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context->Ecx = regs.r_ecx;
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context->Edx = regs.r_edx;
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context->Esi = regs.r_esi;
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context->Edi = regs.r_edi;
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}
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if (flags & CONTEXT_CONTROL)
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{
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context->Ebp = regs.r_ebp;
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context->Esp = regs.r_esp;
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context->Eip = regs.r_eip;
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context->SegCs = regs.r_cs & 0xffff;
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context->SegSs = regs.r_ss & 0xffff;
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context->EFlags = regs.r_efl;
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}
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if (flags & CONTEXT_SEGMENTS)
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{
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context->SegDs = regs.r_ds & 0xffff;
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context->SegEs = regs.r_es & 0xffff;
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context->SegFs = regs.r_fs & 0xffff;
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context->SegGs = regs.r_gs & 0xffff;
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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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/* FIXME: How is this done on Solaris? */
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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, (int) &context->FloatSave ) == -1) goto error;
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context->FloatSave.Cr0NpxState = 0; /* FIXME */
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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( struct thread *thread, unsigned int flags, CONTEXT *context )
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{
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int pid = thread->unix_pid;
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if (flags & CONTEXT_FULL)
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{
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struct regs regs;
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if (((flags | CONTEXT_i386) & CONTEXT_FULL) != CONTEXT_FULL)
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{
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/* need to preserve some registers */
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if (ptrace( PTRACE_GETREGS, pid, 0, (int) ®s ) == -1) goto error;
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}
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if (flags & CONTEXT_INTEGER)
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{
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regs.r_eax = context->Eax;
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regs.r_ebx = context->Ebx;
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regs.r_ecx = context->Ecx;
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regs.r_edx = context->Edx;
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regs.r_esi = context->Esi;
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regs.r_edi = context->Edi;
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}
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if (flags & CONTEXT_CONTROL)
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{
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regs.r_ebp = context->Ebp;
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regs.r_esp = context->Esp;
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regs.r_eip = context->Eip;
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regs.r_cs = context->SegCs;
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regs.r_ss = context->SegSs;
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regs.r_efl = context->EFlags;
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}
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if (flags & CONTEXT_SEGMENTS)
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{
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regs.r_ds = context->SegDs;
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regs.r_es = context->SegEs;
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regs.r_fs = context->SegFs;
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regs.r_gs = context->SegGs;
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}
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if (ptrace( PTRACE_SETREGS, pid, 0, (int) ®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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/* FIXME: How is this done on Solaris? */
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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, (int) &context->FloatSave ) == -1) goto error;
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context->FloatSave.Cr0NpxState = 0; /* FIXME */
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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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#elif defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
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#include <machine/reg.h>
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/* retrieve a thread context */
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static void get_thread_context( struct thread *thread, unsigned int flags, CONTEXT *context )
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{
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int pid = thread->unix_pid;
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if (flags & CONTEXT_FULL)
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{
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struct reg regs;
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if (ptrace( PTRACE_GETREGS, pid, 0, (int) ®s ) == -1) goto error;
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if (flags & CONTEXT_INTEGER)
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{
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context->Eax = regs.r_eax;
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context->Ebx = regs.r_ebx;
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context->Ecx = regs.r_ecx;
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context->Edx = regs.r_edx;
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context->Esi = regs.r_esi;
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context->Edi = regs.r_edi;
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}
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if (flags & CONTEXT_CONTROL)
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{
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context->Ebp = regs.r_ebp;
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context->Esp = regs.r_esp;
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context->Eip = regs.r_eip;
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context->SegCs = regs.r_cs & 0xffff;
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context->SegSs = regs.r_ss & 0xffff;
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context->EFlags = regs.r_eflags;
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}
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if (flags & CONTEXT_SEGMENTS)
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{
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context->SegDs = regs.r_ds & 0xffff;
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context->SegEs = regs.r_es & 0xffff;
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context->SegFs = regs.r_fs & 0xffff;
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context->SegGs = regs.r_gs & 0xffff;
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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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/* FIXME: How is this done on FreeBSD? */
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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, (int) &context->FloatSave ) == -1) goto error;
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context->FloatSave.Cr0NpxState = 0; /* FIXME */
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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( struct thread *thread, unsigned int flags, CONTEXT *context )
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{
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int pid = thread->unix_pid;
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if (flags & CONTEXT_FULL)
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{
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struct reg regs;
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if (((flags | CONTEXT_i386) & CONTEXT_FULL) != CONTEXT_FULL)
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{
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/* need to preserve some registers */
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if (ptrace( PTRACE_GETREGS, pid, 0, (int) ®s ) == -1) goto error;
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}
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if (flags & CONTEXT_INTEGER)
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{
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regs.r_eax = context->Eax;
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regs.r_ebx = context->Ebx;
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regs.r_ecx = context->Ecx;
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regs.r_edx = context->Edx;
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regs.r_esi = context->Esi;
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regs.r_edi = context->Edi;
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}
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if (flags & CONTEXT_CONTROL)
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{
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regs.r_ebp = context->Ebp;
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regs.r_esp = context->Esp;
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regs.r_eip = context->Eip;
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regs.r_cs = context->SegCs;
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regs.r_ss = context->SegSs;
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regs.r_eflags = context->EFlags;
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}
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if (flags & CONTEXT_SEGMENTS)
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{
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regs.r_ds = context->SegDs;
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regs.r_es = context->SegEs;
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regs.r_fs = context->SegFs;
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regs.r_gs = context->SegGs;
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}
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if (ptrace( PTRACE_SETREGS, pid, 0, (int) ®s ) == -1) goto error;
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}
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if (flags & CONTEXT_DEBUG_REGISTERS)
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{
|
|
/* FIXME: How is this done on FreeBSD? */
|
|
}
|
|
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, (int) &context->FloatSave ) == -1) goto error;
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context->FloatSave.Cr0NpxState = 0; /* FIXME */
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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 || __sun__ || __FreeBSD__ */
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#error You must implement get/set_thread_context for your platform
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#endif /* linux || __sun__ || __FreeBSD__ */
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|
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|
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/* copy a context structure according to the flags */
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static void copy_context( CONTEXT *to, 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->Ebp = from->Ebp;
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to->Eip = from->Eip;
|
|
to->Esp = from->Esp;
|
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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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}
|
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if (flags & CONTEXT_INTEGER)
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|
{
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to->Eax = from->Eax;
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to->Ebx = from->Ebx;
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to->Ecx = from->Ecx;
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to->Edx = from->Edx;
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|
to->Esi = from->Esi;
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to->Edi = from->Edi;
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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->FloatSave = from->FloatSave;
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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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|
|
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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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CONTEXT context;
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context.Eip = 0;
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if (suspend_for_ptrace( thread ))
|
|
{
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get_thread_context( thread, CONTEXT_CONTROL, &context );
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resume_thread( thread );
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}
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return (void *)context.Eip;
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}
|
|
|
|
/* determine if we should continue the thread in single-step mode */
|
|
int get_thread_single_step( struct thread *thread )
|
|
{
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|
CONTEXT context;
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if (thread->context) return 0; /* don't single-step inside exception event */
|
|
get_thread_context( thread, CONTEXT_CONTROL, &context );
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return (context.EFlags & 0x100) != 0;
|
|
}
|
|
|
|
/* retrieve the current context of a thread */
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DECL_HANDLER(get_thread_context)
|
|
{
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|
struct thread *thread;
|
|
int flags = req->flags & ~CONTEXT_i386; /* get rid of CPU id */
|
|
|
|
if (get_req_data_size(req) < sizeof(CONTEXT))
|
|
{
|
|
set_error( STATUS_INVALID_PARAMETER );
|
|
return;
|
|
}
|
|
if ((thread = get_thread_from_handle( req->handle, THREAD_GET_CONTEXT )))
|
|
{
|
|
if (thread->context) /* thread is inside an exception event */
|
|
{
|
|
copy_context( get_req_data(req), thread->context, flags );
|
|
flags &= CONTEXT_DEBUG_REGISTERS;
|
|
}
|
|
if (flags && suspend_for_ptrace( thread ))
|
|
{
|
|
get_thread_context( thread, flags, get_req_data(req) );
|
|
resume_thread( thread );
|
|
}
|
|
release_object( thread );
|
|
}
|
|
}
|
|
|
|
|
|
/* set the current context of a thread */
|
|
DECL_HANDLER(set_thread_context)
|
|
{
|
|
struct thread *thread;
|
|
int flags = req->flags & ~CONTEXT_i386; /* get rid of CPU id */
|
|
|
|
if (get_req_data_size(req) < sizeof(CONTEXT))
|
|
{
|
|
set_error( STATUS_INVALID_PARAMETER );
|
|
return;
|
|
}
|
|
if ((thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT )))
|
|
{
|
|
if (thread->context) /* thread is inside an exception event */
|
|
{
|
|
copy_context( thread->context, get_req_data(req), flags );
|
|
flags &= CONTEXT_DEBUG_REGISTERS;
|
|
}
|
|
if (flags && suspend_for_ptrace( thread ))
|
|
{
|
|
set_thread_context( thread, flags, get_req_data(req) );
|
|
resume_thread( thread );
|
|
}
|
|
release_object( thread );
|
|
}
|
|
}
|
|
|
|
#endif /* __i386__ */
|