sparc32: get rid of odd callers of copy_regset_from_user()

[a couple of unused variables left behind by the previous version
spotted by kernel test robot <lkp@intel.com>]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/sparc/kernel/ptrace_32.c

@@ -137,7 +137,6 @@ static int genregs32_set(struct task_struct *target,
 	if (ret || !count)
 		return ret;
 
-	if (pos < 32 * sizeof(u32)) {
 	if (regwindow32_get(target, regs, uregs))
 		return -EFAULT;
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
@@ -149,7 +148,7 @@ static int genregs32_set(struct task_struct *target,
 		return -EFAULT;
 	if (!count)
 		return 0;
-	}
+
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &psr,
 				 32 * sizeof(u32), 33 * sizeof(u32));
@@ -241,13 +240,11 @@ static int fpregs32_set(struct task_struct *target,
 		user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 					  32 * sizeof(u32),
 					  33 * sizeof(u32));
-	if (!ret && count > 0) {
+	if (!ret)
 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 					 &target->thread.fsr,
 					 33 * sizeof(u32),
 					 34 * sizeof(u32));
-	}
-
 	if (!ret)
 		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 						34 * sizeof(u32), -1);
@@ -313,6 +310,33 @@ static int getregs_get(struct task_struct *target,
 				  4 * sizeof(u32), 19 * sizeof(u32));
 }
 
+static int setregs_set(struct task_struct *target,
+			 const struct user_regset *regset,
+			 unsigned int pos, unsigned int count,
+			 const void *kbuf, const void __user *ubuf)
+{
+	struct pt_regs *regs = target->thread.kregs;
+	u32 v[4];
+	int ret;
+
+	if (target == current)
+		flush_user_windows();
+
+	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				 v,
+				 0, 4 * sizeof(u32));
+	if (ret)
+		return ret;
+	regs->psr = (regs->psr & ~(PSR_ICC | PSR_SYSCALL)) |
+		    (v[0] & (PSR_ICC | PSR_SYSCALL));
+	regs->pc = v[1];
+	regs->npc = v[2];
+	regs->y = v[3];
+	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				 regs->u_regs + 1,
+				 4 * sizeof(u32) , 19 * sizeof(u32));
+}
+
 static int getfpregs_get(struct task_struct *target,
 			const struct user_regset *regset,
 			unsigned int pos, unsigned int count,
@@ -340,12 +364,37 @@ static int getfpregs_get(struct task_struct *target,
 				  33 * sizeof(u32), 68 * sizeof(u32));
 }
 
+static int setfpregs_set(struct task_struct *target,
+			const struct user_regset *regset,
+			unsigned int pos, unsigned int count,
+			const void *kbuf, const void __user *ubuf)
+{
+	unsigned long *fpregs = target->thread.float_regs;
+	int ret;
+
+#if 0
+	if (target == current)
+		save_and_clear_fpu();
+#endif
+	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				 fpregs,
+				 0, 32 * sizeof(u32));
+	if (ret)
+		return ret;
+	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				 &target->thread.fsr,
+				 32 * sizeof(u32),
+				 33 * sizeof(u32));
+}
+
 static const struct user_regset ptrace32_regsets[] = {
 	[REGSET_GENERAL] = {
-		.n = 19, .size = sizeof(u32), .get = getregs_get,
+		.n = 19, .size = sizeof(u32),
+		.get = getregs_get, .set = setregs_set,
 	},
 	[REGSET_FP] = {
-		.n = 68, .size = sizeof(u32), .get = getfpregs_get,
+		.n = 68, .size = sizeof(u32),
+		.get = getfpregs_get, .set = setfpregs_set,
 	},
 };
 
@@ -380,12 +429,10 @@ long arch_ptrace(struct task_struct *child, long request,
 {
 	unsigned long addr2 = current->thread.kregs->u_regs[UREG_I4];
 	void __user *addr2p;
-	const struct user_regset_view *view;
 	struct pt_regs __user *pregs;
 	struct fps __user *fps;
 	int ret;
 
-	view = task_user_regset_view(current);
 	addr2p = (void __user *) addr2;
 	pregs = (struct pt_regs __user *) addr;
 	fps = (struct fps __user *) addr;
@@ -400,15 +447,10 @@ long arch_ptrace(struct task_struct *child, long request,
 	}
 
 	case PTRACE_SETREGS: {
-		ret = copy_regset_from_user(child, view, REGSET_GENERAL,
-					    32 * sizeof(u32),
-					    4 * sizeof(u32),
-					    &pregs->psr);
-		if (!ret)
-			copy_regset_from_user(child, view, REGSET_GENERAL,
-					      1 * sizeof(u32),
-					      15 * sizeof(u32),
-					      &pregs->u_regs[0]);
+		ret = copy_regset_from_user(child, &ptrace32_view,
+					    REGSET_GENERAL, 0,
+					    19 * sizeof(u32),
+					    pregs);
 		break;
 	}
 
@@ -421,15 +463,10 @@ long arch_ptrace(struct task_struct *child, long request,
 	}
 
 	case PTRACE_SETFPREGS: {
-		ret = copy_regset_from_user(child, view, REGSET_FP,
-					    0 * sizeof(u32),
-					    32 * sizeof(u32),
-					    &fps->regs[0]);
-		if (!ret)
-			ret = copy_regset_from_user(child, view, REGSET_FP,
+		ret = copy_regset_from_user(child, &ptrace32_view,
+					  REGSET_FP, 0,
 					  33 * sizeof(u32),
-						    1 * sizeof(u32),
-						    &fps->fsr);
+					  fps);
 		break;
 	}