17 files changed, 80 insertions, 220 deletions

diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig
index 4cba7439f9de..4bcf89148f3c 100644
--- a/arch/microblaze/Kconfig
+++ b/arch/microblaze/Kconfig
@@ -26,6 +26,9 @@ config MICROBLAZE
 	select GENERIC_ATOMIC64
 	select GENERIC_CLOCKEVENTS
 	select MODULES_USE_ELF_RELA
+	select GENERIC_KERNEL_THREAD
+	select GENERIC_KERNEL_EXECVE
+	select CLONE_BACKWARDS
 
 config SWAP
 	def_bool n
diff --git a/arch/microblaze/Makefile b/arch/microblaze/Makefile
index b23c40eb7a52..d26fb905ee0a 100644
--- a/arch/microblaze/Makefile
+++ b/arch/microblaze/Makefile
@@ -57,7 +57,7 @@ boot := arch/microblaze/boot
 DTB:=$(subst simpleImage.,,$(filter simpleImage.%, $(MAKECMDGOALS)))
 
 ifneq ($(DTB),)
-	core-y	+= $(boot)/
+	core-y	+= $(boot)/dts/
 endif
 
 # defines filename extension depending memory management type
diff --git a/arch/microblaze/boot/Makefile b/arch/microblaze/boot/Makefile
index fa83ea497db7..80fe54fb7ca3 100644
--- a/arch/microblaze/boot/Makefile
+++ b/arch/microblaze/boot/Makefile
@@ -2,21 +2,10 @@
 # arch/microblaze/boot/Makefile
 #
 
-obj-y += linked_dtb.o
-
 targets := linux.bin linux.bin.gz simpleImage.%
 
 OBJCOPYFLAGS := -R .note -R .comment -R .note.gnu.build-id -O binary
 
-# Ensure system.dtb exists
-$(obj)/linked_dtb.o: $(obj)/system.dtb
-
-# Generate system.dtb from $(DTB).dtb
-ifneq ($(DTB),system)
-$(obj)/system.dtb: $(obj)/$(DTB).dtb
-	$(call if_changed,cp)
-endif
-
 $(obj)/linux.bin: vmlinux FORCE
 	$(call if_changed,objcopy)
 	$(call if_changed,uimage)
@@ -45,10 +34,4 @@ $(obj)/simpleImage.%: vmlinux FORCE
 	@echo 'Kernel: $@ is ready' ' (#'`cat .version`')'
 
 
-# Rule to build device tree blobs
-DTC_FLAGS := -p 1024
-
-$(obj)/%.dtb: $(src)/dts/%.dts FORCE
-	$(call if_changed_dep,dtc)
-
-clean-files += *.dtb simpleImage.*.unstrip linux.bin.ub
+clean-files += simpleImage.*.unstrip linux.bin.ub
diff --git a/arch/microblaze/boot/dts/Makefile b/arch/microblaze/boot/dts/Makefile
new file mode 100644
index 000000000000..c3b3a5d67b89
--- /dev/null
+++ b/arch/microblaze/boot/dts/Makefile
@@ -0,0 +1,22 @@
+#
+# arch/microblaze/boot/Makefile
+#
+
+obj-y += linked_dtb.o
+
+# Ensure system.dtb exists
+$(obj)/linked_dtb.o: $(obj)/system.dtb
+
+# Generate system.dtb from $(DTB).dtb
+ifneq ($(DTB),system)
+$(obj)/system.dtb: $(obj)/$(DTB).dtb
+	$(call if_changed,cp)
+endif
+
+quiet_cmd_cp = CP      $< $@$2
+	cmd_cp = cat $< >$@$2 || (rm -f $@ && echo false)
+
+# Rule to build device tree blobs
+DTC_FLAGS := -p 1024
+
+clean-files += *.dtb
diff --git a/arch/microblaze/boot/dts/linked_dtb.S b/arch/microblaze/boot/dts/linked_dtb.S
new file mode 100644
index 000000000000..23345af3721f
--- /dev/null
+++ b/arch/microblaze/boot/dts/linked_dtb.S
@@ -0,0 +1,2 @@
+.section __fdt_blob,"a"
+.incbin "arch/microblaze/boot/dts/system.dtb"
diff --git a/arch/microblaze/boot/linked_dtb.S b/arch/microblaze/boot/linked_dtb.S
deleted file mode 100644
index cb2b537aebee..000000000000
--- a/arch/microblaze/boot/linked_dtb.S
+++ /dev/null
@@ -1,3 +0,0 @@
-.section __fdt_blob,"a"
-.incbin "arch/microblaze/boot/system.dtb"
-
diff --git a/arch/microblaze/include/asm/Kbuild b/arch/microblaze/include/asm/Kbuild
index 8653072d7e9f..eb3a46c096fe 100644
--- a/arch/microblaze/include/asm/Kbuild
+++ b/arch/microblaze/include/asm/Kbuild
@@ -3,3 +3,5 @@ include include/asm-generic/Kbuild.asm
 header-y  += elf.h
 generic-y += clkdev.h
 generic-y += exec.h
+generic-y += trace_clock.h
+generic-y += syscalls.h
diff --git a/arch/microblaze/include/asm/processor.h b/arch/microblaze/include/asm/processor.h
index af2bb9652392..0759153e8117 100644
--- a/arch/microblaze/include/asm/processor.h
+++ b/arch/microblaze/include/asm/processor.h
@@ -31,6 +31,7 @@ extern const struct seq_operations cpuinfo_op;
 void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp);
 
 extern void ret_from_fork(void);
+extern void ret_from_kernel_thread(void);
 
 # endif /* __ASSEMBLY__ */
 
@@ -78,11 +79,6 @@ extern unsigned long thread_saved_pc(struct task_struct *t);
 
 extern unsigned long get_wchan(struct task_struct *p);
 
-/*
- * create a kernel thread without removing it from tasklists
- */
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
 # define KSTK_EIP(tsk)	(0)
 # define KSTK_ESP(tsk)	(0)
 
@@ -131,8 +127,6 @@ extern inline void release_thread(struct task_struct *dead_task)
 {
 }
 
-extern int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
-
 /* Free current thread data structures etc.  */
 static inline void exit_thread(void)
 {
diff --git a/arch/microblaze/include/asm/syscalls.h b/arch/microblaze/include/asm/syscalls.h
deleted file mode 100644
index 27f2f4c0f39f..000000000000
--- a/arch/microblaze/include/asm/syscalls.h
+++ /dev/null
@@ -1,16 +0,0 @@
-#ifndef __ASM_MICROBLAZE_SYSCALLS_H
-
-asmlinkage long microblaze_vfork(struct pt_regs *regs);
-asmlinkage long microblaze_clone(int flags, unsigned long stack,
-							struct pt_regs *regs);
-asmlinkage long microblaze_execve(const char __user *filenamei,
-				  const char __user *const __user *argv,
-				  const char __user *const __user *envp,
-				  struct pt_regs *regs);
-
-asmlinkage long sys_clone(int flags, unsigned long stack, struct pt_regs *regs);
-#define sys_clone sys_clone
-
-#include <asm-generic/syscalls.h>
-
-#endif /* __ASM_MICROBLAZE_SYSCALLS_H */
diff --git a/arch/microblaze/include/asm/unistd.h b/arch/microblaze/include/asm/unistd.h
index 6985e6e9d826..94d978986b75 100644
--- a/arch/microblaze/include/asm/unistd.h
+++ b/arch/microblaze/include/asm/unistd.h
@@ -422,6 +422,12 @@
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #define __ARCH_WANT_SYS_RT_SIGACTION
 #define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
+#define __ARCH_WANT_SYS_CLONE
+#define __ARCH_WANT_SYS_VFORK
+#ifdef CONFIG_MMU
+#define __ARCH_WANT_SYS_FORK
+#endif
 
 /*
  * "Conditional" syscalls
diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S
index 75c3ea1f48a1..cb0327f204ab 100644
--- a/arch/microblaze/kernel/entry-nommu.S
+++ b/arch/microblaze/kernel/entry-nommu.S
@@ -474,6 +474,14 @@ ENTRY(ret_from_fork)
 	brid	ret_to_user
 	nop
 
+ENTRY(ret_from_kernel_thread)
+	brlid	r15, schedule_tail
+	addk	r5, r0, r3
+	brald	r15, r20
+	addk	r5, r0, r19
+	brid	ret_to_user
+	addk	r3, r0, r0
+
 work_pending:
 	enable_irq
 
@@ -551,18 +559,6 @@ no_work_pending:
 	rtid	r14, 0
 	nop
 
-sys_vfork:
-	brid	microblaze_vfork
-	addk	r5, r1, r0
-
-sys_clone:
-	brid	microblaze_clone
-	addk	r7, r1, r0
-
-sys_execve:
-	brid	microblaze_execve
-	addk	r8, r1, r0
-
 sys_rt_sigreturn_wrapper:
 	brid	sys_rt_sigreturn
 	addk	r5, r1, r0
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index 03f7b8ce6b6b..c217367dfc7b 100644
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@@ -293,24 +293,6 @@ C_ENTRY(_user_exception):
 	swi	r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
 	addi	r14, r14, 4	/* return address is 4 byte after call */
 
-	mfs	r1, rmsr
-	nop
-	andi	r1, r1, MSR_UMS
-	bnei	r1, 1f
-
-/* Kernel-mode state save - kernel execve */
-	lwi	r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/
-	tophys(r1,r1);
-
-	addik	r1, r1, -PT_SIZE; /* Make room on the stack. */
-	SAVE_REGS
-
-	swi	r1, r1, PT_MODE; /* pt_regs -> kernel mode */
-	brid	2f;
-	nop;				/* Fill delay slot */
-
-/* User-mode state save.  */
-1:
 	lwi	r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */
 	tophys(r1,r1);
 	lwi	r1, r1, TS_THREAD_INFO;	/* get stack from task_struct */
@@ -460,18 +442,6 @@ TRAP_return:		/* Make global symbol for debugging */
 	nop;
 
 
-/* These syscalls need access to the struct pt_regs on the stack, so we
-   implement them in assembly (they're basically all wrappers anyway).  */
-
-C_ENTRY(sys_fork_wrapper):
-	addi	r5, r0, SIGCHLD			/* Arg 0: flags */
-	lwi	r6, r1, PT_R1	/* Arg 1: child SP (use parent's) */
-	addik	r7, r1, 0			/* Arg 2: parent context */
-	add	r8, r0, r0			/* Arg 3: (unused) */
-	add	r9, r0, r0;			/* Arg 4: (unused) */
-	brid	do_fork		/* Do real work (tail-call) */
-	add	r10, r0, r0;			/* Arg 5: (unused) */
-
 /* This the initial entry point for a new child thread, with an appropriate
    stack in place that makes it look the the child is in the middle of an
    syscall.  This function is actually `returned to' from switch_thread
@@ -479,28 +449,19 @@ C_ENTRY(sys_fork_wrapper):
    saved context).  */
 C_ENTRY(ret_from_fork):
 	bralid	r15, schedule_tail; /* ...which is schedule_tail's arg */
-	add	r3, r5, r0;	/* switch_thread returns the prev task */
+	add	r5, r3, r0;	/* switch_thread returns the prev task */
 				/* ( in the delay slot ) */
 	brid	ret_from_trap;	/* Do normal trap return */
 	add	r3, r0, r0;	/* Child's fork call should return 0. */
 
-C_ENTRY(sys_vfork):
-	brid	microblaze_vfork	/* Do real work (tail-call) */
-	addik	r5, r1, 0
-
-C_ENTRY(sys_clone):
-	bnei	r6, 1f;			/* See if child SP arg (arg 1) is 0. */
-	lwi	r6, r1, PT_R1;	/* If so, use paret's stack ptr */
-1:	addik	r7, r1, 0;			/* Arg 2: parent context */
-	lwi     r9, r1, PT_R8;          /* parent tid.  */
-	lwi     r10, r1, PT_R9;         /* child tid.  */
-	/* do_fork will pick up TLS from regs->r10.  */
-	brid	do_fork		/* Do real work (tail-call) */
-	add     r8, r0, r0;             /* Arg 3: (unused) */
-
-C_ENTRY(sys_execve):
-	brid	microblaze_execve;	/* Do real work (tail-call).*/
-	addik	r8, r1, 0;		/* add user context as 4th arg */
+C_ENTRY(ret_from_kernel_thread):
+	bralid	r15, schedule_tail; /* ...which is schedule_tail's arg */
+	add	r5, r3, r0;	/* switch_thread returns the prev task */
+				/* ( in the delay slot ) */
+	brald	r15, r20	/* fn was left in r20 */
+	addk	r5, r0, r19	/* ... and argument - in r19 */
+	brid	ret_from_trap
+	add	r3, r0, r0
 
 C_ENTRY(sys_rt_sigreturn_wrapper):
 	brid	sys_rt_sigreturn	/* Do real work */
diff --git a/arch/microblaze/kernel/process.c b/arch/microblaze/kernel/process.c
index 1944e00f07e1..40823fd1db0b 100644
--- a/arch/microblaze/kernel/process.c
+++ b/arch/microblaze/kernel/process.c
@@ -13,6 +13,7 @@
 #include <linux/pm.h>
 #include <linux/tick.h>
 #include <linux/bitops.h>
+#include <linux/ptrace.h>
 #include <asm/pgalloc.h>
 #include <asm/uaccess.h> /* for USER_DS macros */
 #include <asm/cacheflush.h>
@@ -119,46 +120,38 @@ void flush_thread(void)
 }
 
 int copy_thread(unsigned long clone_flags, unsigned long usp,
-		unsigned long unused,
-		struct task_struct *p, struct pt_regs *regs)
+		unsigned long arg, struct task_struct *p)
 {
 	struct pt_regs *childregs = task_pt_regs(p);
 	struct thread_info *ti = task_thread_info(p);
 
-	*childregs = *regs;
-	if (user_mode(regs))
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		/* if we're creating a new kernel thread then just zeroing all
+		 * the registers. That's OK for a brand new thread.*/
+		memset(childregs, 0, sizeof(struct pt_regs));
+		memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
+		ti->cpu_context.r1  = (unsigned long)childregs;
+		ti->cpu_context.r20 = (unsigned long)usp; /* fn */
+		ti->cpu_context.r19 = (unsigned long)arg;
+		childregs->pt_mode = 1;
+		local_save_flags(childregs->msr);
+#ifdef CONFIG_MMU
+		ti->cpu_context.msr = childregs->msr & ~MSR_IE;
+#endif
+		ti->cpu_context.r15 = (unsigned long)ret_from_kernel_thread - 8;
+		return 0;
+	}
+	*childregs = *current_pt_regs();
+	if (usp)
 		childregs->r1 = usp;
-	else
-		childregs->r1 = ((unsigned long) ti) + THREAD_SIZE;
 
-#ifndef CONFIG_MMU
 	memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
 	ti->cpu_context.r1 = (unsigned long)childregs;
+#ifndef CONFIG_MMU
 	ti->cpu_context.msr = (unsigned long)childregs->msr;
 #else
+	childregs->msr |= MSR_UMS;
 
-	/* if creating a kernel thread then update the current reg (we don't
-	 * want to use the parent's value when restoring by POP_STATE) */
-	if (kernel_mode(regs))
-		/* save new current on stack to use POP_STATE */
-		childregs->CURRENT_TASK = (unsigned long)p;
-	/* if returning to user then use the parent's value of this register */
-
-	/* if we're creating a new kernel thread then just zeroing all
-	 * the registers. That's OK for a brand new thread.*/
-	/* Pls. note that some of them will be restored in POP_STATE */
-	if (kernel_mode(regs))
-		memset(&ti->cpu_context, 0, sizeof(struct cpu_context));
-	/* if this thread is created for fork/vfork/clone, then we want to
-	 * restore all the parent's context */
-	/* in addition to the registers which will be restored by POP_STATE */
-	else {
-		ti->cpu_context = *(struct cpu_context *)regs;
-		childregs->msr |= MSR_UMS;
-	}
-
-	/* FIXME STATE_SAVE_PT_OFFSET; */
-	ti->cpu_context.r1  = (unsigned long)childregs;
 	/* we should consider the fact that childregs is a copy of the parent
 	 * regs which were saved immediately after entering the kernel state
 	 * before enabling VM. This MSR will be restored in switch_to and
@@ -209,29 +202,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk)
 }
 #endif
 
-static void kernel_thread_helper(int (*fn)(void *), void *arg)
-{
-	fn(arg);
-	do_exit(-1);
-}
-
-int kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
-{
-	struct pt_regs regs;
-
-	memset(&regs, 0, sizeof(regs));
-	/* store them in non-volatile registers */
-	regs.r5 = (unsigned long)fn;
-	regs.r6 = (unsigned long)arg;
-	local_save_flags(regs.msr);
-	regs.pc = (unsigned long)kernel_thread_helper;
-	regs.pt_mode = 1;
-
-	return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
-			&regs, 0, NULL, NULL);
-}
-EXPORT_SYMBOL_GPL(kernel_thread);
-
 unsigned long get_wchan(struct task_struct *p)
 {
 /* TBD (used by procfs) */
@@ -246,6 +216,7 @@ void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long usp)
 	regs->pt_mode = 0;
 #ifdef CONFIG_MMU
 	regs->msr |= MSR_UMS;
+	regs->msr &= ~MSR_VM;
 #endif
 }
 
diff --git a/arch/microblaze/kernel/signal.c b/arch/microblaze/kernel/signal.c
index 3847e5b9c601..3903e3d11f5a 100644
--- a/arch/microblaze/kernel/signal.c
+++ b/arch/microblaze/kernel/signal.c
@@ -111,7 +111,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
 
 	/* It is more difficult to avoid calling this function than to
 	 call it and ignore errors. */
-	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->r1))
+	if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->r1) == -EFAULT)
 		goto badframe;
 
 	return rval;
diff --git a/arch/microblaze/kernel/sys_microblaze.c b/arch/microblaze/kernel/sys_microblaze.c
index 404c0f24bd41..63647c586b43 100644
--- a/arch/microblaze/kernel/sys_microblaze.c
+++ b/arch/microblaze/kernel/sys_microblaze.c
@@ -34,38 +34,6 @@
 
 #include <asm/syscalls.h>
 
-asmlinkage long microblaze_vfork(struct pt_regs *regs)
-{
-	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->r1,
-						regs, 0, NULL, NULL);
-}
-
-asmlinkage long microblaze_clone(int flags, unsigned long stack,
-							struct pt_regs *regs)
-{
-	if (!stack)
-		stack = regs->r1;
-	return do_fork(flags, stack, regs, 0, NULL, NULL);
-}
-
-asmlinkage long microblaze_execve(const char __user *filenamei,
-				  const char __user *const __user *argv,
-				  const char __user *const __user *envp,
-				  struct pt_regs *regs)
-{
-	int error;
-	struct filename *filename;
-
-	filename = getname(filenamei);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		goto out;
-	error = do_execve(filename->name, argv, envp, regs);
-	putname(filename);
-out:
-	return error;
-}
-
 asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
 			unsigned long prot, unsigned long flags,
 			unsigned long fd, off_t pgoff)
@@ -75,24 +43,3 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
 
 	return sys_mmap_pgoff(addr, len, prot, flags, fd, pgoff >> PAGE_SHIFT);
 }
-
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-int kernel_execve(const char *filename,
-		  const char *const argv[],
-		  const char *const envp[])
-{
-	register const char *__a __asm__("r5") = filename;
-	register const void *__b __asm__("r6") = argv;
-	register const void *__c __asm__("r7") = envp;
-	register unsigned long __syscall __asm__("r12") = __NR_execve;
-	register unsigned long __ret __asm__("r3");
-	__asm__ __volatile__ ("brki r14, 0x8"
-			: "=r" (__ret), "=r" (__syscall)
-			: "1" (__syscall), "r" (__a), "r" (__b), "r" (__c)
-			: "r4", "r8", "r9",
-			"r10", "r11", "r14", "cc", "memory");
-	return __ret;
-}
diff --git a/arch/microblaze/kernel/syscall_table.S b/arch/microblaze/kernel/syscall_table.S
index 6a2b294ef6dc..ff6431e54680 100644
--- a/arch/microblaze/kernel/syscall_table.S
+++ b/arch/microblaze/kernel/syscall_table.S
@@ -2,11 +2,7 @@ ENTRY(sys_call_table)
 	.long sys_restart_syscall	/* 0 - old "setup()" system call,
 					 * used for restarting */
 	.long sys_exit
-#ifdef CONFIG_MMU
-	.long sys_fork_wrapper
-#else
-	.long sys_ni_syscall
-#endif
+	.long sys_fork
 	.long sys_read
 	.long sys_write
 	.long sys_open			/* 5 */
diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
index 4dbb5055d04b..a1c5b996d66d 100644
--- a/arch/microblaze/pci/pci-common.c
+++ b/arch/microblaze/pci/pci-common.c
@@ -1346,8 +1346,6 @@ void __init pcibios_resource_survey(void)
 	pci_assign_unassigned_resources();
 }
 
-#ifdef CONFIG_HOTPLUG
-
 /* This is used by the PCI hotplug driver to allocate resource
  * of newly plugged busses. We can try to consolidate with the
  * rest of the code later, for now, keep it as-is as our main
@@ -1407,8 +1405,6 @@ void pcibios_finish_adding_to_bus(struct pci_bus *bus)
 }
 EXPORT_SYMBOL_GPL(pcibios_finish_adding_to_bus);
 
-#endif /* CONFIG_HOTPLUG */
-
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
 	return pci_enable_resources(dev, mask);