ntdll: Linux support for saving and restoring the extended FPU context on exceptions.
This commit is contained in:
Alexandre Julliard
parent
f45b7078bf
commit
bd352bcd1c
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@ -68,6 +68,33 @@
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#undef ERR /* Solaris needs to define this */
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/* not defined for x86, so copy the x86_64 definition */
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typedef struct DECLSPEC_ALIGN(16) _M128A
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{
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ULONGLONG Low;
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LONGLONG High;
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} M128A;
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typedef struct
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{
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WORD ControlWord;
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WORD StatusWord;
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BYTE TagWord;
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BYTE Reserved1;
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WORD ErrorOpcode;
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DWORD ErrorOffset;
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WORD ErrorSelector;
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WORD Reserved2;
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DWORD DataOffset;
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WORD DataSelector;
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WORD Reserved3;
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DWORD MxCsr;
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DWORD MxCsr_Mask;
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M128A FloatRegisters[8];
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M128A XmmRegisters[16];
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BYTE Reserved4[96];
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} XMM_SAVE_AREA32;
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/***********************************************************************
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* signal context platform-specific definitions
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*/
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@ -98,6 +125,7 @@ typedef ucontext_t SIGCONTEXT;
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#define ERROR_sig(context) ((context)->uc_mcontext.gregs[REG_ERR])
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#define FPU_sig(context) ((FLOATING_SAVE_AREA*)((context)->uc_mcontext.fpregs))
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#define FPUX_sig(context) ((context)->uc_mcontext.fpregs->status >> 16 ? NULL : (XMM_SAVE_AREA32 *)(FPU_sig(context) + 1))
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#define VM86_EAX 0 /* the %eax value while vm86_enter is executing */
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@ -165,6 +193,9 @@ typedef struct trapframe SIGCONTEXT;
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#define EIP_sig(context) (*((unsigned long*)&(context)->tf_eip))
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#define ESP_sig(context) (*((unsigned long*)&(context)->tf_esp))
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#define FPU_sig(context) NULL /* FIXME */
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#define FPUX_sig(context) NULL /* FIXME */
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#endif /* bsdi */
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#if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__OpenBSD__)
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@ -193,6 +224,9 @@ typedef struct sigcontext SIGCONTEXT;
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#define EIP_sig(context) ((context)->sc_eip)
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#define ESP_sig(context) ((context)->sc_esp)
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#define FPU_sig(context) NULL /* FIXME */
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#define FPUX_sig(context) NULL /* FIXME */
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#endif /* *BSD */
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#if defined(__svr4__) || defined(_SCO_DS) || defined(__sun)
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@ -240,6 +274,9 @@ typedef struct ucontext SIGCONTEXT;
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#define TRAP_sig(context) ((context)->uc_mcontext.gregs[TRAPNO])
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#endif
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#define FPU_sig(context) NULL /* FIXME */
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#define FPUX_sig(context) NULL /* FIXME */
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#endif /* svr4 || SCO_DS */
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#ifdef __APPLE__
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@ -288,6 +325,9 @@ typedef ucontext_t SIGCONTEXT;
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#define ERROR_sig(context) ((context)->uc_mcontext->es.err)
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#endif
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#define FPU_sig(context) NULL /* FIXME */
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#define FPUX_sig(context) NULL /* FIXME */
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#endif /* __APPLE__ */
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WINE_DEFAULT_DEBUG_CHANNEL(seh);
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@ -299,6 +339,8 @@ static size_t signal_stack_size;
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static wine_signal_handler handlers[256];
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static int fpux_support; /* whether the CPU support extended fpu context */
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extern void DECLSPEC_NORETURN __wine_call_from_32_restore_regs( const CONTEXT *context );
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enum i386_trap_code
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@ -605,6 +647,25 @@ static inline void save_fpu( CONTEXT *context )
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}
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/***********************************************************************
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* save_fpux
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*
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* Save the thread FPU extended context.
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*/
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static inline void save_fpux( CONTEXT *context )
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{
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#ifdef __GNUC__
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/* we have to enforce alignment by hand */
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char buffer[sizeof(XMM_SAVE_AREA32) + 16];
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XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
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__asm__ __volatile__( "fxsave %0" : "=m" (*state) );
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context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
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memcpy( context->ExtendedRegisters, state, sizeof(*state) );
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#endif
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}
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/***********************************************************************
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* restore_fpu
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*
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@ -621,6 +682,26 @@ static inline void restore_fpu( const CONTEXT *context )
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}
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/***********************************************************************
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* restore_fpux
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*
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* Restore the FPU extended context to a sigcontext.
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*/
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static inline void restore_fpux( const CONTEXT *context )
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{
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#ifdef __GNUC__
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/* we have to enforce alignment by hand */
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char buffer[sizeof(XMM_SAVE_AREA32) + 16];
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XMM_SAVE_AREA32 *state = (XMM_SAVE_AREA32 *)(((ULONG_PTR)buffer + 15) & ~15);
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memcpy( state, context->ExtendedRegisters, sizeof(*state) );
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/* reset the current interrupt status */
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state->StatusWord &= state->ControlWord | 0xff80;
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__asm__ __volatile__( "fxrstor %0" : : "m" (*state) );
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#endif
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}
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/***********************************************************************
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* save_context
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*
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@ -629,6 +710,8 @@ static inline void restore_fpu( const CONTEXT *context )
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static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext, WORD fs, WORD gs )
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{
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struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
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FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
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XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
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memset(context, 0, sizeof(*context));
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context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
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@ -655,17 +738,20 @@ static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext,
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context->Dr6 = regs->dr6;
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context->Dr7 = regs->dr7;
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#ifdef FPU_sig
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if (FPU_sig(sigcontext))
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if (fpu)
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{
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context->ContextFlags |= CONTEXT_FLOATING_POINT;
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context->FloatSave = *FPU_sig(sigcontext);
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context->FloatSave = *fpu;
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}
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else
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#endif
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if (fpux)
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{
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save_fpu( context );
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save_fpux( context );
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context->ContextFlags |= CONTEXT_EXTENDED_REGISTERS;
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memcpy( context->ExtendedRegisters, fpux, sizeof(*fpux) );
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fpux_support = 1;
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/* FIXME: convert fpux to fpu */
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}
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if (!fpu && !fpux) save_fpu( context );
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}
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@ -677,6 +763,8 @@ static inline void save_context( CONTEXT *context, const SIGCONTEXT *sigcontext,
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static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigcontext )
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{
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struct ntdll_thread_regs * const regs = ntdll_get_thread_regs();
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FLOATING_SAVE_AREA *fpu = FPU_sig(sigcontext);
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XMM_SAVE_AREA32 *fpux = FPUX_sig(sigcontext);
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regs->dr0 = context->Dr0;
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regs->dr1 = context->Dr1;
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@ -709,16 +797,9 @@ static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigconte
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wine_set_fs( context->SegFs );
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#endif
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#ifdef FPU_sig
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if (FPU_sig(sigcontext))
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{
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*FPU_sig(sigcontext) = context->FloatSave;
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}
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else
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#endif
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{
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restore_fpu( context );
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}
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if (fpu) *fpu = context->FloatSave;
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if (fpux) memcpy( fpux, context->ExtendedRegisters, sizeof(*fpux) );
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if (!fpu && !fpux) restore_fpu( context );
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}
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@ -730,7 +811,8 @@ static inline void restore_context( const CONTEXT *context, SIGCONTEXT *sigconte
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void WINAPI __regs_get_cpu_context( CONTEXT *context, CONTEXT *regs )
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{
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*context = *regs;
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save_fpu( context );
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if (fpux_support) save_fpux( context );
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else save_fpu( context );
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}
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DEFINE_REGS_ENTRYPOINT( get_cpu_context, 4, 4 )
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@ -744,7 +826,8 @@ void set_cpu_context( const CONTEXT *context )
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{
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DWORD flags = context->ContextFlags & ~CONTEXT_i386;
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if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
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if (flags & CONTEXT_EXTENDED_REGISTERS) restore_fpux( context );
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else if (flags & CONTEXT_FLOATING_POINT) restore_fpu( context );
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if (flags & CONTEXT_DEBUG_REGISTERS)
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{
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