8 files changed, 22 insertions, 83 deletions

diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 98fabd10e95f..04bef4d25b4a 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -8,6 +8,8 @@ config H8300
         select GENERIC_IRQ_SHOW
         select GENERIC_CPU_DEVICES
         select MODULES_USE_ELF_RELA
+        select GENERIC_KERNEL_THREAD
+        select GENERIC_KERNEL_EXECVE
 
 config SYMBOL_PREFIX
         string
diff --git a/arch/h8300/include/asm/processor.h b/arch/h8300/include/asm/processor.h
index 4c9f6f87b617..4b0ca49bb463 100644
--- a/arch/h8300/include/asm/processor.h
+++ b/arch/h8300/include/asm/processor.h
@@ -107,8 +107,6 @@ static 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..
  */
diff --git a/arch/h8300/include/asm/ptrace.h b/arch/h8300/include/asm/ptrace.h
index d09c440bdba7..00502a61bf0a 100644
--- a/arch/h8300/include/asm/ptrace.h
+++ b/arch/h8300/include/asm/ptrace.h
@@ -60,6 +60,8 @@ struct pt_regs {
 #define user_mode(regs) (!((regs)->ccr & PS_S))
 #define instruction_pointer(regs) ((regs)->pc)
 #define profile_pc(regs) instruction_pointer(regs)
+#define current_pt_regs() ((struct pt_regs *) \
+        (THREAD_SIZE + (unsigned long)current_thread_info()) - 1)
 #endif /* __KERNEL__ */
 #endif /* __ASSEMBLY__ */
 #endif /* _H8300_PTRACE_H */
diff --git a/arch/h8300/include/asm/unistd.h b/arch/h8300/include/asm/unistd.h
index 5cd882801d79..07afcfaec995 100644
--- a/arch/h8300/include/asm/unistd.h
+++ b/arch/h8300/include/asm/unistd.h
@@ -356,6 +356,7 @@
 #define __ARCH_WANT_SYS_SIGPROCMASK
 #define __ARCH_WANT_SYS_RT_SIGACTION
 #define __ARCH_WANT_SYS_RT_SIGSUSPEND
+#define __ARCH_WANT_SYS_EXECVE
 
 /*
  * "Conditional" syscalls
diff --git a/arch/h8300/kernel/entry.S b/arch/h8300/kernel/entry.S
index ca7431690300..617a6878787f 100644
--- a/arch/h8300/kernel/entry.S
+++ b/arch/h8300/kernel/entry.S
@@ -158,6 +158,7 @@ INTERRUPTS = 128
 .globl SYMBOL_NAME(system_call)
 .globl SYMBOL_NAME(ret_from_exception)
 .globl SYMBOL_NAME(ret_from_fork)
+.globl SYMBOL_NAME(ret_from_kernel_thread)
 .globl SYMBOL_NAME(ret_from_interrupt)
 .globl SYMBOL_NAME(interrupt_redirect_table)
 .globl SYMBOL_NAME(sw_ksp),SYMBOL_NAME(sw_usp)
@@ -330,6 +331,14 @@ SYMBOL_NAME_LABEL(ret_from_fork)
         jsr     @SYMBOL_NAME(schedule_tail)
         jmp     @SYMBOL_NAME(ret_from_exception)
 
+SYMBOL_NAME_LABEL(ret_from_kernel_thread)
+        mov.l   er2,er0
+        jsr     @SYMBOL_NAME(schedule_tail)
+        mov.l   @(LER4:16,sp),er0
+        mov.l   @(LER5:16,sp),er1
+        jsr     @er1
+        jmp     @SYMBOL_NAME(ret_from_exception)
+
 SYMBOL_NAME_LABEL(resume)
         /*
          * Beware - when entering resume, offset of tss is in d1,
diff --git a/arch/h8300/kernel/h8300_ksyms.c b/arch/h8300/kernel/h8300_ksyms.c
index 6866bd9c7fb4..53d7c0e4bd83 100644
--- a/arch/h8300/kernel/h8300_ksyms.c
+++ b/arch/h8300/kernel/h8300_ksyms.c
@@ -33,7 +33,6 @@ EXPORT_SYMBOL(strncmp);
 
 EXPORT_SYMBOL(ip_fast_csum);
 
-EXPORT_SYMBOL(kernel_thread);
 EXPORT_SYMBOL(enable_irq);
 EXPORT_SYMBOL(disable_irq);
 
diff --git a/arch/h8300/kernel/process.c b/arch/h8300/kernel/process.c
index e8dc1393a13a..2a45718cc5e8 100644
--- a/arch/h8300/kernel/process.c
+++ b/arch/h8300/kernel/process.c
@@ -47,6 +47,7 @@ void (*pm_power_off)(void) = NULL;
 EXPORT_SYMBOL(pm_power_off);
 
 asmlinkage void ret_from_fork(void);
+asmlinkage void ret_from_kernel_thread(void);
 
 /*
  * The idle loop on an H8/300..
@@ -122,39 +123,6 @@ void show_regs(struct pt_regs * regs)
                 printk("\n");
 }
 
-/*
- * Create a kernel thread
- */
-int kernel_thread(int (*fn)(void *), void * arg, unsigned long flags)
-{
-        long retval;
-        long clone_arg;
-        mm_segment_t fs;
-
-        fs = get_fs();
-        set_fs (KERNEL_DS);
-        clone_arg = flags | CLONE_VM;
-        __asm__("mov.l sp,er3\n\t"
-                "sub.l er2,er2\n\t"
-                "mov.l %2,er1\n\t"
-                "mov.l %1,er0\n\t"
-                "trapa #0\n\t"
-                "cmp.l sp,er3\n\t"
-                "beq 1f\n\t"
-                "mov.l %4,er0\n\t"
-                "mov.l %3,er1\n\t"
-                "jsr @er1\n\t"
-                "mov.l %5,er0\n\t"
-                "trapa #0\n"
-                "1:\n\t"
-                "mov.l er0,%0"
-                :"=r"(retval)
-                :"i"(__NR_clone),"g"(clone_arg),"g"(fn),"g"(arg),"i"(__NR_exit)
-                :"er0","er1","er2","er3");
-        set_fs (fs);
-        return retval;
-}
-
 void flush_thread(void)
 {
 }
@@ -198,6 +166,13 @@ int copy_thread(unsigned long clone_flags,
 
         childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
 
+        if (unlikely(p->flags & PF_KTHREAD)) {
+                memset(childregs, 0, sizeof(struct pt_regs));
+                childregs->retpc = (unsigned long) ret_from_kernel_thread;
+                childregs->er4 = topstk; /* arg */
+                childregs->er5 = usp; /* fn */
+                p->thread.ksp = (unsigned long)childregs;
+        }
         *childregs = *regs;
         childregs->retpc = (unsigned long) ret_from_fork;
         childregs->er0 = 0;
@@ -208,27 +183,6 @@ int copy_thread(unsigned long clone_flags,
         return 0;
 }
 
-/*
- * sys_execve() executes a new program.
- */
-asmlinkage int sys_execve(const char *name,
-                          const char *const *argv,
-                          const char *const *envp,
-                          int dummy, ...)
-{
-        int error;
-        struct filename *filename;
-        struct pt_regs *regs = (struct pt_regs *) ((unsigned char *)&dummy-4);
-
-        filename = getname(name);
-        error = PTR_ERR(filename);
-        if (IS_ERR(filename))
-                return error;
-        error = do_execve(filename->name, argv, envp, regs);
-        putname(filename);
-        return error;
-}
-
 unsigned long thread_saved_pc(struct task_struct *tsk)
 {
         return ((struct pt_regs *)tsk->thread.esp0)->pc;
diff --git a/arch/h8300/kernel/sys_h8300.c b/arch/h8300/kernel/sys_h8300.c
index 4bdc7311784e..bf350cb7f597 100644
--- a/arch/h8300/kernel/sys_h8300.c
+++ b/arch/h8300/kernel/sys_h8300.c
@@ -46,29 +46,3 @@ asmlinkage void syscall_print(void *dummy,...)
                ((regs->pc)&0xffffff)-2,regs->orig_er0,regs->er1,regs->er2,regs->er3,regs->er0);
 }
 #endif
-
-/*
- * Do a system call from kernel instead of calling sys_execve so we
- * end up with proper pt_regs.
- */
-asmlinkage
-int kernel_execve(const char *filename,
-                  const char *const argv[],
-                  const char *const envp[])
-{
-        register long res __asm__("er0");
-        register const char *const *_c __asm__("er3") = envp;
-        register const char *const *_b __asm__("er2") = argv;
-        register const char * _a __asm__("er1") = filename;
-        __asm__ __volatile__ ("mov.l %1,er0\n\t"
-                        "trapa  #0\n\t"
-                        : "=r" (res)
-                        : "g" (__NR_execve),
-                          "g" (_a),
-                          "g" (_b),
-                          "g" (_c)
-                        : "cc", "memory");
-        return res;
-}
-
-