X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=arch%2Fx86%2Fia32%2Fia32_signal.c;h=4bc02b23674b5dfaaf91e813fb2be320dc57cd23;hb=a29a2af378f3f6362b68e126e2541c8bde885ead;hp=bbed3a26ce5567abb107f0371651c906b5f368a7;hpb=55928e37b29ba5557a5edc8ab679fe5191bc051d;p=safe%2Fjmp%2Flinux-2.6

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index bbed3a2..4bc02b2 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -36,6 +36,11 @@
 
 #define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
+#define FIX_EFLAGS	(X86_EFLAGS_AC | X86_EFLAGS_OF | \
+			 X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \
+			 X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \
+			 X86_EFLAGS_CF)
+
 asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
 void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
 
@@ -128,7 +133,7 @@ asmlinkage long sys32_sigsuspend(int history0, int history1, old_sigset_t mask)
 
 	current->state = TASK_INTERRUPTIBLE;
 	schedule();
-	set_thread_flag(TIF_RESTORE_SIGMASK);
+	set_restore_sigmask();
 	return -ERESTARTNOHAND;
 }
 
@@ -174,9 +179,10 @@ struct sigframe
 	u32 pretcode;
 	int sig;
 	struct sigcontext_ia32 sc;
-	struct _fpstate_ia32 fpstate;
+	struct _fpstate_ia32 fpstate_unused; /* look at kernel/sigframe.h */
 	unsigned int extramask[_COMPAT_NSIG_WORDS-1];
 	char retcode[8];
+	/* fp state follows here */
 };
 
 struct rt_sigframe
@@ -187,8 +193,8 @@ struct rt_sigframe
 	u32 puc;
 	compat_siginfo_t info;
 	struct ucontext_ia32 uc;
-	struct _fpstate_ia32 fpstate;
 	char retcode[8];
+	/* fp state follows here */
 };
 
 #define COPY(x)		{ 		\
@@ -201,7 +207,7 @@ struct rt_sigframe
 	{ unsigned int cur;						\
 	  unsigned short pre;						\
 	  err |= __get_user(pre, &sc->seg);				\
-	  asm volatile("movl %%" #seg ",%0" : "=r" (cur));		\
+	  savesegment(seg, cur);					\
 	  pre |= mask;							\
 	  if (pre != cur) loadsegment(seg, pre); }
 
@@ -210,7 +216,7 @@ static int ia32_restore_sigcontext(struct pt_regs *regs,
 				   unsigned int *peax)
 {
 	unsigned int tmpflags, gs, oldgs, err = 0;
-	struct _fpstate_ia32 __user *buf;
+	void __user *buf;
 	u32 tmp;
 
 	/* Always make any pending restarted system calls return -EINTR */
@@ -230,7 +236,7 @@ static int ia32_restore_sigcontext(struct pt_regs *regs,
 	 */
 	err |= __get_user(gs, &sc->gs);
 	gs |= 3;
-	asm("movl %%gs,%0" : "=r" (oldgs));
+	savesegment(gs, oldgs);
 	if (gs != oldgs)
 		load_gs_index(gs);
 
@@ -248,32 +254,18 @@ static int ia32_restore_sigcontext(struct pt_regs *regs,
 	regs->ss |= 3;
 
 	err |= __get_user(tmpflags, &sc->flags);
-	regs->flags = (regs->flags & ~0x40DD5) | (tmpflags & 0x40DD5);
+	regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
 	/* disable syscall checks */
 	regs->orig_ax = -1;
 
 	err |= __get_user(tmp, &sc->fpstate);
 	buf = compat_ptr(tmp);
-	if (buf) {
-		if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
-			goto badframe;
-		err |= restore_i387_ia32(buf);
-	} else {
-		struct task_struct *me = current;
-
-		if (used_math()) {
-			clear_fpu(me);
-			clear_used_math();
-		}
-	}
+	err |= restore_i387_xstate_ia32(buf);
 
 	err |= __get_user(tmp, &sc->ax);
 	*peax = tmp;
 
 	return err;
-
-badframe:
-	return 1;
 }
 
 asmlinkage long sys32_sigreturn(struct pt_regs *regs)
@@ -345,46 +337,42 @@ badframe:
  */
 
 static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc,
-				 struct _fpstate_ia32 __user *fpstate,
+				 void __user *fpstate,
 				 struct pt_regs *regs, unsigned int mask)
 {
 	int tmp, err = 0;
 
-	tmp = 0;
-	__asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp));
+	savesegment(gs, tmp);
 	err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
-	__asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp));
+	savesegment(fs, tmp);
 	err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
-	__asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp));
+	savesegment(ds, tmp);
 	err |= __put_user(tmp, (unsigned int __user *)&sc->ds);
-	__asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp));
+	savesegment(es, tmp);
 	err |= __put_user(tmp, (unsigned int __user *)&sc->es);
 
-	err |= __put_user((u32)regs->di, &sc->di);
-	err |= __put_user((u32)regs->si, &sc->si);
-	err |= __put_user((u32)regs->bp, &sc->bp);
-	err |= __put_user((u32)regs->sp, &sc->sp);
-	err |= __put_user((u32)regs->bx, &sc->bx);
-	err |= __put_user((u32)regs->dx, &sc->dx);
-	err |= __put_user((u32)regs->cx, &sc->cx);
-	err |= __put_user((u32)regs->ax, &sc->ax);
-	err |= __put_user((u32)regs->cs, &sc->cs);
-	err |= __put_user((u32)regs->ss, &sc->ss);
+	err |= __put_user(regs->di, &sc->di);
+	err |= __put_user(regs->si, &sc->si);
+	err |= __put_user(regs->bp, &sc->bp);
+	err |= __put_user(regs->sp, &sc->sp);
+	err |= __put_user(regs->bx, &sc->bx);
+	err |= __put_user(regs->dx, &sc->dx);
+	err |= __put_user(regs->cx, &sc->cx);
+	err |= __put_user(regs->ax, &sc->ax);
+	err |= __put_user(regs->cs, &sc->cs);
+	err |= __put_user(regs->ss, &sc->ss);
 	err |= __put_user(current->thread.trap_no, &sc->trapno);
 	err |= __put_user(current->thread.error_code, &sc->err);
-	err |= __put_user((u32)regs->ip, &sc->ip);
-	err |= __put_user((u32)regs->flags, &sc->flags);
-	err |= __put_user((u32)regs->sp, &sc->sp_at_signal);
+	err |= __put_user(regs->ip, &sc->ip);
+	err |= __put_user(regs->flags, &sc->flags);
+	err |= __put_user(regs->sp, &sc->sp_at_signal);
 
-	tmp = save_i387_ia32(fpstate);
+	tmp = save_i387_xstate_ia32(fpstate);
 	if (tmp < 0)
 		err = -EFAULT;
-	else {
-		clear_used_math();
-		stts();
+	else
 		err |= __put_user(ptr_to_compat(tmp ? fpstate : NULL),
 					&sc->fpstate);
-	}
 
 	/* non-iBCS2 extensions.. */
 	err |= __put_user(mask, &sc->oldmask);
@@ -397,7 +385,8 @@ static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc,
  * Determine which stack to use..
  */
 static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
-				 size_t frame_size)
+				 size_t frame_size,
+				 void **fpstate)
 {
 	unsigned long sp;
 
@@ -416,6 +405,11 @@ static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
 		 ka->sa.sa_restorer)
 		sp = (unsigned long) ka->sa.sa_restorer;
 
+	if (used_math()) {
+		sp = sp - sig_xstate_ia32_size;
+		*fpstate = (struct _fpstate_ia32 *) sp;
+	}
+
 	sp -= frame_size;
 	/* Align the stack pointer according to the i386 ABI,
 	 * i.e. so that on function entry ((sp + 4) & 15) == 0. */
@@ -429,6 +423,7 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
 	struct sigframe __user *frame;
 	void __user *restorer;
 	int err = 0;
+	void __user *fpstate = NULL;
 
 	/* copy_to_user optimizes that into a single 8 byte store */
 	static const struct {
@@ -443,25 +438,21 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
 		0,
 	};
 
-	frame = get_sigframe(ka, regs, sizeof(*frame));
+	frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
 
 	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		goto give_sigsegv;
+		return -EFAULT;
 
-	err |= __put_user(sig, &frame->sig);
-	if (err)
-		goto give_sigsegv;
+	if (__put_user(sig, &frame->sig))
+		return -EFAULT;
 
-	err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs,
-					set->sig[0]);
-	if (err)
-		goto give_sigsegv;
+	if (ia32_setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
+		return -EFAULT;
 
 	if (_COMPAT_NSIG_WORDS > 1) {
-		err |= __copy_to_user(frame->extramask, &set->sig[1],
-				      sizeof(frame->extramask));
-		if (err)
-			goto give_sigsegv;
+		if (__copy_to_user(frame->extramask, &set->sig[1],
+				   sizeof(frame->extramask)))
+			return -EFAULT;
 	}
 
 	if (ka->sa.sa_flags & SA_RESTORER) {
@@ -482,7 +473,7 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
 	 */
 	err |= __copy_to_user(frame->retcode, &code, 8);
 	if (err)
-		goto give_sigsegv;
+		return -EFAULT;
 
 	/* Set up registers for signal handler */
 	regs->sp = (unsigned long) frame;
@@ -493,8 +484,8 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
 	regs->dx = 0;
 	regs->cx = 0;
 
-	asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
-	asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
+	loadsegment(ds, __USER32_DS);
+	loadsegment(es, __USER32_DS);
 
 	regs->cs = __USER32_CS;
 	regs->ss = __USER32_DS;
@@ -505,19 +496,15 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
 #endif
 
 	return 0;
-
-give_sigsegv:
-	force_sigsegv(sig, current);
-	return -EFAULT;
 }
 
 int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 			compat_sigset_t *set, struct pt_regs *regs)
 {
 	struct rt_sigframe __user *frame;
-	struct exec_domain *ed = current_thread_info()->exec_domain;
 	void __user *restorer;
 	int err = 0;
+	void __user *fpstate = NULL;
 
 	/* __copy_to_user optimizes that into a single 8 byte store */
 	static const struct {
@@ -533,31 +520,33 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 		0,
 	};
 
-	frame = get_sigframe(ka, regs, sizeof(*frame));
+	frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
 
 	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		goto give_sigsegv;
+		return -EFAULT;
 
-	err |= __put_user((ed && ed->signal_invmap && sig < 32
-			   ? ed->signal_invmap[sig] : sig), &frame->sig);
+	err |= __put_user(sig, &frame->sig);
 	err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo);
 	err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc);
 	err |= copy_siginfo_to_user32(&frame->info, info);
 	if (err)
-		goto give_sigsegv;
+		return -EFAULT;
 
 	/* Create the ucontext.  */
-	err |= __put_user(0, &frame->uc.uc_flags);
+	if (cpu_has_xsave)
+		err |= __put_user(UC_FP_XSTATE, &frame->uc.uc_flags);
+	else
+		err |= __put_user(0, &frame->uc.uc_flags);
 	err |= __put_user(0, &frame->uc.uc_link);
 	err |= __put_user(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
 	err |= __put_user(sas_ss_flags(regs->sp),
 			  &frame->uc.uc_stack.ss_flags);
 	err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
-	err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
+	err |= ia32_setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
 				     regs, set->sig[0]);
 	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
 	if (err)
-		goto give_sigsegv;
+		return -EFAULT;
 
 	if (ka->sa.sa_flags & SA_RESTORER)
 		restorer = ka->sa.sa_restorer;
@@ -572,7 +561,7 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	 */
 	err |= __copy_to_user(frame->retcode, &code, 8);
 	if (err)
-		goto give_sigsegv;
+		return -EFAULT;
 
 	/* Set up registers for signal handler */
 	regs->sp = (unsigned long) frame;
@@ -588,8 +577,8 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 	regs->dx = (unsigned long) &frame->info;
 	regs->cx = (unsigned long) &frame->uc;
 
-	asm volatile("movl %0,%%ds" :: "r" (__USER32_DS));
-	asm volatile("movl %0,%%es" :: "r" (__USER32_DS));
+	loadsegment(ds, __USER32_DS);
+	loadsegment(es, __USER32_DS);
 
 	regs->cs = __USER32_CS;
 	regs->ss = __USER32_DS;
@@ -600,8 +589,4 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 #endif
 
 	return 0;
-
-give_sigsegv:
-	force_sigsegv(sig, current);
-	return -EFAULT;
 }