1 files changed, 31 insertions, 134 deletions

diff --git a/arch/sh/kernel/process_32.c b/arch/sh/kernel/process_32.c
index 762a13984bb..2885fc9d9dc 100644
--- a/arch/sh/kernel/process_32.c
+++ b/arch/sh/kernel/process_32.c
@@ -21,20 +21,18 @@
 #include <linux/fs.h>
 #include <linux/ftrace.h>
 #include <linux/hw_breakpoint.h>
+#include <linux/prefetch.h>
+#include <linux/stackprotector.h>
 #include <asm/uaccess.h>
 #include <asm/mmu_context.h>
-#include <asm/system.h>
 #include <asm/fpu.h>
 #include <asm/syscalls.h>
+#include <asm/switch_to.h>
 
 void show_regs(struct pt_regs * regs)
 {
 	printk("\n");
-	printk("Pid : %d, Comm: \t\t%s\n", task_pid_nr(current), current->comm);
-	printk("CPU : %d        \t\t%s  (%s %.*s)\n\n",
-	       smp_processor_id(), print_tainted(), init_utsname()->release,
-	       (int)strcspn(init_utsname()->version, " "),
-	       init_utsname()->version);
+	show_regs_print_info(KERN_DEFAULT);
 
 	print_symbol("PC is at %s\n", instruction_pointer(regs));
 	print_symbol("PR is at %s\n", regs->pr);
@@ -66,43 +64,9 @@ void show_regs(struct pt_regs * regs)
 	show_code(regs);
 }
 
-/*
- * Create a kernel thread
- */
-ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *))
-{
-	do_exit(fn(arg));
-}
-
-/* Don't use this in BL=1(cli).  Or else, CPU resets! */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
-	struct pt_regs regs;
-	int pid;
-
-	memset(&regs, 0, sizeof(regs));
-	regs.regs[4] = (unsigned long)arg;
-	regs.regs[5] = (unsigned long)fn;
-
-	regs.pc = (unsigned long)kernel_thread_helper;
-	regs.sr = SR_MD;
-#if defined(CONFIG_SH_FPU)
-	regs.sr |= SR_FD;
-#endif
-
-	/* Ok, create the new process.. */
-	pid = do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0,
-		      &regs, 0, NULL, NULL);
-
-	return pid;
-}
-EXPORT_SYMBOL(kernel_thread);
-
 void start_thread(struct pt_regs *regs, unsigned long new_pc,
 		  unsigned long new_sp)
 {
-	set_fs(USER_DS);
-
 	regs->pr = 0;
 	regs->sr = SR_FD;
 	regs->pc = new_pc;
@@ -156,20 +120,11 @@ int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 }
 EXPORT_SYMBOL(dump_fpu);
 
-/*
- * This gets called before we allocate a new thread and copy
- * the current task into it.
- */
-void prepare_to_copy(struct task_struct *tsk)
-{
-	unlazy_fpu(tsk, task_pt_regs(tsk));
-}
-
 asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_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 thread_info *ti = task_thread_info(p);
 	struct pt_regs *childregs;
@@ -186,29 +141,35 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
 	}
 #endif
 
-	childregs = task_pt_regs(p);
-	*childregs = *regs;
+	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
 
-	if (user_mode(regs)) {
-		childregs->regs[15] = usp;
-		ti->addr_limit = USER_DS;
-	} else {
-		childregs->regs[15] = (unsigned long)childregs;
+	childregs = task_pt_regs(p);
+	p->thread.sp = (unsigned long) childregs;
+	if (unlikely(p->flags & PF_KTHREAD)) {
+		memset(childregs, 0, sizeof(struct pt_regs));
+		p->thread.pc = (unsigned long) ret_from_kernel_thread;
+		childregs->regs[4] = arg;
+		childregs->regs[5] = usp;
+		childregs->sr = SR_MD;
+#if defined(CONFIG_SH_FPU)
+		childregs->sr |= SR_FD;
+#endif
 		ti->addr_limit = KERNEL_DS;
 		ti->status &= ~TS_USEDFPU;
-		p->fpu_counter = 0;
+		p->thread.fpu_counter = 0;
+		return 0;
 	}
+	*childregs = *current_pt_regs();
+
+	if (usp)
+		childregs->regs[15] = usp;
+	ti->addr_limit = USER_DS;
 
 	if (clone_flags & CLONE_SETTLS)
 		childregs->gbr = childregs->regs[0];
 
 	childregs->regs[0] = 0; /* Set return value for child */
-
-	p->thread.sp = (unsigned long) childregs;
 	p->thread.pc = (unsigned long) ret_from_fork;
-
-	memset(p->thread.ptrace_bps, 0, sizeof(p->thread.ptrace_bps));
-
 	return 0;
 }
 
@@ -221,10 +182,14 @@ __switch_to(struct task_struct *prev, struct task_struct *next)
 {
 	struct thread_struct *next_t = &next->thread;
 
+#if defined(CONFIG_CC_STACKPROTECTOR) && !defined(CONFIG_SMP)
+	__stack_chk_guard = next->stack_canary;
+#endif
+
 	unlazy_fpu(prev, task_pt_regs(prev));
 
 	/* we're going to use this soon, after a few expensive things */
-	if (next->fpu_counter > 5)
+	if (next->thread.fpu_counter > 5)
 		prefetch(next_t->xstate);
 
 #ifdef CONFIG_MMU
@@ -242,80 +207,12 @@ __switch_to(struct task_struct *prev, struct task_struct *next)
 	 * restore of the math state immediately to avoid the trap; the
 	 * chances of needing FPU soon are obviously high now
 	 */
-	if (next->fpu_counter > 5)
+	if (next->thread.fpu_counter > 5)
 		__fpu_state_restore();
 
 	return prev;
 }
 
-asmlinkage int sys_fork(unsigned long r4, unsigned long r5,
-			unsigned long r6, unsigned long r7,
-			struct pt_regs __regs)
-{
-#ifdef CONFIG_MMU
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	return do_fork(SIGCHLD, regs->regs[15], regs, 0, NULL, NULL);
-#else
-	/* fork almost works, enough to trick you into looking elsewhere :-( */
-	return -EINVAL;
-#endif
-}
-
-asmlinkage int sys_clone(unsigned long clone_flags, unsigned long newsp,
-			 unsigned long parent_tidptr,
-			 unsigned long child_tidptr,
-			 struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	if (!newsp)
-		newsp = regs->regs[15];
-	return do_fork(clone_flags, newsp, regs, 0,
-			(int __user *)parent_tidptr,
-			(int __user *)child_tidptr);
-}
-
-/*
- * This is trivial, and on the face of it looks like it
- * could equally well be done in user mode.
- *
- * Not so, for quite unobvious reasons - register pressure.
- * In user mode vfork() cannot have a stack frame, and if
- * done by calling the "clone()" system call directly, you
- * do not have enough call-clobbered registers to hold all
- * the information you need.
- */
-asmlinkage int sys_vfork(unsigned long r4, unsigned long r5,
-			 unsigned long r6, unsigned long r7,
-			 struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->regs[15], regs,
-		       0, NULL, NULL);
-}
-
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char __user *ufilename,
-			  const char __user *const __user *uargv,
-			  const char __user *const __user *uenvp,
-			  unsigned long r7, struct pt_regs __regs)
-{
-	struct pt_regs *regs = RELOC_HIDE(&__regs, 0);
-	int error;
-	char *filename;
-
-	filename = getname(ufilename);
-	error = PTR_ERR(filename);
-	if (IS_ERR(filename))
-		goto out;
-
-	error = do_execve(filename, uargv, uenvp, regs);
-	putname(filename);
-out:
-	return error;
-}
-
 unsigned long get_wchan(struct task_struct *p)
 {
 	unsigned long pc;