sh: Add FPU registers to regset interface.

Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

arch/sh/Kconfig

@@ -23,7 +23,7 @@ config SUPERH32
 	def_bool !SUPERH64
 	select HAVE_KPROBES
 	select HAVE_KRETPROBES
-	select HAVE_ARCH_TRACEHOOK if !SH_FPU
+	select HAVE_ARCH_TRACEHOOK
 	select HAVE_FTRACE
 
 config SUPERH64

arch/sh/include/asm/elf.h

@@ -108,10 +108,10 @@ typedef struct user_fpu_struct elf_fpregset_t;
 #define elf_check_fdpic(x)		((x)->e_flags & EF_SH_FDPIC)
 #define elf_check_const_displacement(x)	((x)->e_flags & EF_SH_PIC)
 
-#if defined(CONFIG_SUPERH32) && !defined(CONFIG_SH_FPU)
+#ifdef CONFIG_SUPERH32
 /*
- * Enable dump using regset for general purpose registers, use this as
- * the default once the FPU registers are moved over also.
+ * Enable dump using regset.
+ * This covers all of general/DSP/FPU regs.
  */
 #define CORE_DUMP_USE_REGSET
 #endif

arch/sh/include/asm/fpu.h

@@ -30,8 +30,15 @@ static inline void save_fpu(struct task_struct *tsk, struct pt_regs *regs)
 }
 #endif
 
+struct user_regset;
+
 extern int do_fpu_inst(unsigned short, struct pt_regs *);
 
+extern int fpregs_get(struct task_struct *target,
+		      const struct user_regset *regset,
+		      unsigned int pos, unsigned int count,
+		      void *kbuf, void __user *ubuf);
+
 static inline void unlazy_fpu(struct task_struct *tsk, struct pt_regs *regs)
 {
 	preempt_disable();
@@ -50,6 +57,18 @@ static inline void clear_fpu(struct task_struct *tsk, struct pt_regs *regs)
 	preempt_enable();
 }
 
+static inline int init_fpu(struct task_struct *tsk)
+{
+	if (tsk_used_math(tsk)) {
+		if ((boot_cpu_data.flags & CPU_HAS_FPU) && tsk == current)
+			unlazy_fpu(tsk, task_pt_regs(tsk));
+		return 0;
+	}
+
+	set_stopped_child_used_math(tsk);
+	return 0;
+}
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ASM_SH_FPU_H */

arch/sh/kernel/process_32.c

@@ -7,7 +7,11 @@
  *
  *  SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
  *		     Copyright (C) 2006 Lineo Solutions Inc. support SH4A UBC
- *		     Copyright (C) 2002 - 2007  Paul Mundt
+ *		     Copyright (C) 2002 - 2008  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
  */
 #include <linux/module.h>
 #include <linux/mm.h>
@@ -222,10 +226,10 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 	struct task_struct *tsk = current;
 
 	fpvalid = !!tsk_used_math(tsk);
-	if (fpvalid) {
-		unlazy_fpu(tsk, regs);
-		memcpy(fpu, &tsk->thread.fpu.hard, sizeof(*fpu));
-	}
+	if (fpvalid)
+		fpvalid = !fpregs_get(tsk, NULL, 0,
+				      sizeof(struct user_fpu_struct),
+				      fpu, NULL);
 #endif
 
 	return fpvalid;

arch/sh/kernel/ptrace_32.c

@@ -32,6 +32,7 @@
 #include <asm/processor.h>
 #include <asm/mmu_context.h>
 #include <asm/syscalls.h>
+#include <asm/fpu.h>
 
 /*
  * This routine will get a word off of the process kernel stack.
@@ -145,6 +146,54 @@ static int genregs_set(struct task_struct *target,
 	return ret;
 }
 
+#ifdef CONFIG_SH_FPU
+int fpregs_get(struct task_struct *target,
+	       const struct user_regset *regset,
+	       unsigned int pos, unsigned int count,
+	       void *kbuf, void __user *ubuf)
+{
+	int ret;
+
+	ret = init_fpu(target);
+	if (ret)
+		return ret;
+
+	if ((boot_cpu_data.flags & CPU_HAS_FPU))
+		return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+					   &target->thread.fpu.hard, 0, -1);
+
+	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+				   &target->thread.fpu.soft, 0, -1);
+}
+
+static int fpregs_set(struct task_struct *target,
+		       const struct user_regset *regset,
+		       unsigned int pos, unsigned int count,
+		       const void *kbuf, const void __user *ubuf)
+{
+	int ret;
+
+	ret = init_fpu(target);
+	if (ret)
+		return ret;
+
+	set_stopped_child_used_math(target);
+
+	if ((boot_cpu_data.flags & CPU_HAS_FPU))
+		return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+					  &target->thread.fpu.hard, 0, -1);
+
+	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				  &target->thread.fpu.soft, 0, -1);
+}
+
+static int fpregs_active(struct task_struct *target,
+			 const struct user_regset *regset)
+{
+	return tsk_used_math(target) ? regset->n : 0;
+}
+#endif
+
 #ifdef CONFIG_SH_DSP
 static int dspregs_get(struct task_struct *target,
 		       const struct user_regset *regset,
@@ -194,6 +243,9 @@ static int dspregs_active(struct task_struct *target,
  */
 enum sh_regset {
 	REGSET_GENERAL,
+#ifdef CONFIG_SH_FPU
+	REGSET_FPU,
+#endif
 #ifdef CONFIG_SH_DSP
 	REGSET_DSP,
 #endif
@@ -214,6 +266,18 @@ static const struct user_regset sh_regsets[] = {
 		.set		= genregs_set,
 	},
 
+#ifdef CONFIG_SH_FPU
+	[REGSET_FPU] = {
+		.core_note_type	= NT_PRFPREG,
+		.n		= sizeof(struct user_fpu_struct) / sizeof(long),
+		.size		= sizeof(long),
+		.align		= sizeof(long),
+		.get		= fpregs_get,
+		.set		= fpregs_set,
+		.active		= fpregs_active,
+	},
+#endif
+
 #ifdef CONFIG_SH_DSP
 	[REGSET_DSP] = {
 		.n		= sizeof(struct pt_dspregs) / sizeof(long),
@@ -304,6 +368,18 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 					     REGSET_GENERAL,
 					     0, sizeof(struct pt_regs),
 					     (const void __user *)data);
+#ifdef CONFIG_SH_FPU
+	case PTRACE_GETFPREGS:
+		return copy_regset_to_user(child, &user_sh_native_view,
+					   REGSET_FPU,
+					   0, sizeof(struct user_fpu_struct),
+					   (void __user *)data);
+	case PTRACE_SETFPREGS:
+		return copy_regset_from_user(child, &user_sh_native_view,
+					     REGSET_FPU,
+					     0, sizeof(struct user_fpu_struct),
+					     (const void __user *)data);
+#endif
 #ifdef CONFIG_SH_DSP
 	case PTRACE_GETDSPREGS:
 		return copy_regset_to_user(child, &user_sh_native_view,