forked from Minki/linux
parisc: switch to generic kernel_thread()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
parent
ddffeb8c4d
commit
a44e060fc5
@ -22,6 +22,7 @@ config PARISC
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select GENERIC_STRNCPY_FROM_USER
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select HAVE_MOD_ARCH_SPECIFIC
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select MODULES_USE_ELF_RELA
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select GENERIC_KERNEL_THREAD
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help
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The PA-RISC microprocessor is designed by Hewlett-Packard and used
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@ -707,60 +707,10 @@ ENTRY(end_fault_vector)
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.import handle_interruption,code
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.import do_cpu_irq_mask,code
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/*
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* r26 = function to be called
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* r25 = argument to pass in
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* r24 = flags for do_fork()
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*
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* Kernel threads don't ever return, so they don't need
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* a true register context. We just save away the arguments
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* for copy_thread/ret_ to properly set up the child.
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*/
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#define CLONE_VM 0x100 /* Must agree with <linux/sched.h> */
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#define CLONE_UNTRACED 0x00800000
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.import do_fork
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ENTRY(__kernel_thread)
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STREG %r2, -RP_OFFSET(%r30)
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copy %r30, %r1
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ldo PT_SZ_ALGN(%r30),%r30
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#ifdef CONFIG_64BIT
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/* Yo, function pointers in wide mode are little structs... -PB */
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ldd 24(%r26), %r2
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STREG %r2, PT_GR27(%r1) /* Store childs %dp */
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ldd 16(%r26), %r26
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STREG %r22, PT_GR22(%r1) /* save r22 (arg5) */
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copy %r0, %r22 /* user_tid */
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#endif
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STREG %r26, PT_GR26(%r1) /* Store function & argument for child */
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STREG %r25, PT_GR25(%r1)
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ldil L%CLONE_UNTRACED, %r26
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ldo CLONE_VM(%r26), %r26 /* Force CLONE_VM since only init_mm */
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or %r26, %r24, %r26 /* will have kernel mappings. */
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ldi 1, %r25 /* stack_start, signals kernel thread */
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stw %r0, -52(%r30) /* user_tid */
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#ifdef CONFIG_64BIT
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ldo -16(%r30),%r29 /* Reference param save area */
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#endif
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BL do_fork, %r2
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copy %r1, %r24 /* pt_regs */
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/* Parent Returns here */
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LDREG -PT_SZ_ALGN-RP_OFFSET(%r30), %r2
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ldo -PT_SZ_ALGN(%r30), %r30
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bv %r0(%r2)
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nop
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ENDPROC(__kernel_thread)
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/*
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* Child Returns here
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*
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* copy_thread moved args from temp save area set up above
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* into task save area.
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* copy_thread moved args into task save area.
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*/
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ENTRY(ret_from_kernel_thread)
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@ -773,7 +723,6 @@ ENTRY(ret_from_kernel_thread)
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LDREG TASK_PT_GR25(%r1), %r26
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#ifdef CONFIG_64BIT
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LDREG TASK_PT_GR27(%r1), %r27
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LDREG TASK_PT_GR22(%r1), %r22
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#endif
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LDREG TASK_PT_GR26(%r1), %r1
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ble 0(%sr7, %r1)
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@ -164,23 +164,6 @@ void machine_power_off(void)
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void (*pm_power_off)(void) = machine_power_off;
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EXPORT_SYMBOL(pm_power_off);
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/*
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* Create a kernel thread
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*/
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extern pid_t __kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
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pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
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{
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/*
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* FIXME: Once we are sure we don't need any debug here,
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* kernel_thread can become a #define.
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*/
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return __kernel_thread(fn, arg, flags);
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}
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EXPORT_SYMBOL(kernel_thread);
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/*
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* Free current thread data structures etc..
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*/
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@ -256,8 +239,8 @@ sys_vfork(struct pt_regs *regs)
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int
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copy_thread(unsigned long clone_flags, unsigned long usp,
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unsigned long unused, /* in ia64 this is "user_stack_size" */
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struct task_struct * p, struct pt_regs * pregs)
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unsigned long arg,
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struct task_struct *p, struct pt_regs *pregs)
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{
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struct pt_regs * cregs = &(p->thread.regs);
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void *stack = task_stack_page(p);
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@ -271,21 +254,8 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
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extern void * const hpux_child_return;
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#endif
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*cregs = *pregs;
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/* Set the return value for the child. Note that this is not
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actually restored by the syscall exit path, but we put it
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here for consistency in case of signals. */
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cregs->gr[28] = 0; /* child */
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/*
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* We need to differentiate between a user fork and a
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* kernel fork. We can't use user_mode, because the
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* the syscall path doesn't save iaoq. Right now
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* We rely on the fact that kernel_thread passes
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* in zero for usp.
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*/
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if (usp == 1) {
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if (unlikely((p->flags & PF_KTHREAD) && usp != 0)) {
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memset(cregs, 0, sizeof(struct pt_regs));
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/* kernel thread */
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cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN;
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/* Must exit via ret_from_kernel_thread in order
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@ -297,10 +267,12 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
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* ret_from_kernel_thread.
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*/
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#ifdef CONFIG_64BIT
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cregs->gr[27] = pregs->gr[27];
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cregs->gr[27] = ((unsigned long *)usp)[3];
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cregs->gr[26] = ((unsigned long *)usp)[2];
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#else
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cregs->gr[26] = usp;
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#endif
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cregs->gr[26] = pregs->gr[26];
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cregs->gr[25] = pregs->gr[25];
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cregs->gr[25] = arg;
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} else {
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/* user thread */
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/*
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@ -308,6 +280,13 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
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* for setting gr[21].
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*/
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*cregs = *pregs;
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/* Set the return value for the child. Note that this is not
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actually restored by the syscall exit path, but we put it
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here for consistency in case of signals. */
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cregs->gr[28] = 0; /* child */
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/* Use same stack depth as parent */
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cregs->ksp = (unsigned long)stack
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+ (pregs->gr[21] & (THREAD_SIZE - 1));
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