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Commit f6cb551d authored by Alexandre Julliard's avatar Alexandre Julliard
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server: Remove some no longer needed ptrace code to set registers.

Also make sure the debug registers are properly copied to the context when set.
parent 2bfe47e8
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Showing with 99 additions and 390 deletions
server/context_i386.c
View file @ f6cb551d
......@@ -58,19 +58,6 @@
# 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
......@@ -84,18 +71,6 @@
# 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)))
......@@ -114,390 +89,122 @@ static inline int get_debug_reg( int pid, int num, DWORD *data )
return 0;
}
/* retrieve a thread context */
static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
/* retrieve the thread x86 debug registers */
static int get_thread_debug_regs( struct thread *thread, 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;
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;
return 1;
error:
file_set_error();
return 0;
}
#elif defined(__sun) || defined(__sun__)
/* retrieve a thread context */
static void get_thread_context_ptrace( struct thread *thread, unsigned int flags, CONTEXT *context )
/* set the thread x86 debug registers */
static int set_thread_debug_regs( struct thread *thread, const 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;
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;
return 1;
error:
file_set_error();
return 0;
}
#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || 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 )
/* retrieve the thread x86 debug registers */
static int get_thread_debug_regs( struct thread *thread, 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;
int pid = get_ptrace_pid(thread);
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);
/* 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;
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
}
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;
return 1;
error:
file_set_error();
#endif
return 0;
}
/* set a thread context */
static void set_thread_context_ptrace( struct thread *thread, unsigned int flags, const CONTEXT *context )
/* set the thread x86 debug registers */
static int set_thread_debug_regs( struct thread *thread, 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;
int pid = get_ptrace_pid(thread);
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;
/* 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;
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:
if (ptrace( PTRACE_SETDBREGS, pid, (caddr_t) &dbregs, 0 ) != -1) return 1;
file_set_error();
#endif
return 0;
}
#else /* linux || __sun__ || __FreeBSD__ */
#error You must implement get/set_thread_context_ptrace for your platform
#endif /* linux || __sun__ || __FreeBSD__ */
#else /* linux || __FreeBSD__ */
/* retrieve the thread x86 debug registers */
static int get_thread_debug_regs( struct thread *thread, CONTEXT *context )
{
return 0;
}
/* set the thread x86 debug registers */
static int set_thread_debug_regs( struct thread *thread, const CONTEXT *context )
{
return 0;
}
#endif /* linux || __FreeBSD__ */
/* copy a context structure according to the flags */
......@@ -532,9 +239,16 @@ static void copy_context( CONTEXT *to, const CONTEXT *from, unsigned int flags )
{
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;
if (flags & CONTEXT_DEBUG_REGISTERS)
{
to->Dr0 = from->Dr0;
to->Dr1 = from->Dr1;
to->Dr2 = from->Dr2;
to->Dr3 = from->Dr3;
to->Dr6 = from->Dr6;
to->Dr7 = from->Dr7;
}
to->ContextFlags |= flags;
}
/* retrieve the current instruction pointer of a context */
......@@ -550,13 +264,11 @@ void get_thread_context( struct thread *thread, CONTEXT *context, unsigned int f
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;
copy_context( context, thread->context, flags & ~CONTEXT_DEBUG_REGISTERS );
if (flags && suspend_for_ptrace( thread ))
if ((flags & CONTEXT_DEBUG_REGISTERS) && suspend_for_ptrace( thread ))
{
get_thread_context_ptrace( thread, flags, context );
if (get_thread_debug_regs( thread, context )) context->ContextFlags |= CONTEXT_DEBUG_REGISTERS;
resume_after_ptrace( thread );
}
}
......@@ -566,16 +278,13 @@ void set_thread_context( struct thread *thread, const CONTEXT *context, unsigned
{
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 ))
if ((flags & CONTEXT_DEBUG_REGISTERS) && suspend_for_ptrace( thread ))
{
set_thread_context_ptrace( thread, flags, context );
if (!set_thread_debug_regs( thread, context )) flags &= ~CONTEXT_DEBUG_REGISTERS;
resume_after_ptrace( thread );
}
if (thread->context) copy_context( thread->context, context, flags );
}
#endif /* __i386__ */
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