h8300: generic kernel_thread()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig
index 98fabd1..4cef8a9 100644
--- a/arch/h8300/Kconfig
+++ b/arch/h8300/Kconfig
@@ -8,6 +8,7 @@
select GENERIC_IRQ_SHOW
select GENERIC_CPU_DEVICES
select MODULES_USE_ELF_RELA
+ select GENERIC_KERNEL_THREAD
config SYMBOL_PREFIX
string
diff --git a/arch/h8300/include/asm/processor.h b/arch/h8300/include/asm/processor.h
index 4c9f6f8..4b0ca49 100644
--- a/arch/h8300/include/asm/processor.h
+++ b/arch/h8300/include/asm/processor.h
@@ -107,8 +107,6 @@
{
}
-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 d09c440..00502a6 100644
--- a/arch/h8300/include/asm/ptrace.h
+++ b/arch/h8300/include/asm/ptrace.h
@@ -60,6 +60,8 @@
#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/kernel/entry.S b/arch/h8300/kernel/entry.S
index ca74316..2cdb49a 100644
--- a/arch/h8300/kernel/entry.S
+++ b/arch/h8300/kernel/entry.S
@@ -158,6 +158,7 @@
.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 +331,15 @@
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
+ sub.l @er0,@er0
+ jsr @SYMBOL_NAME(sys_exit)
+
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 6866bd9..53d7c0e 100644
--- a/arch/h8300/kernel/h8300_ksyms.c
+++ b/arch/h8300/kernel/h8300_ksyms.c
@@ -33,7 +33,6 @@
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 e8dc139..e3dfea7 100644
--- a/arch/h8300/kernel/process.c
+++ b/arch/h8300/kernel/process.c
@@ -47,6 +47,7 @@
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 @@
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 @@
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;