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parisc: switch to generic fork/vfork/clone

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2012-10-26 19:59:16 -04:00
parent 92bbe6cdfd
commit 415bfae9e9
4 changed files with 22 additions and 69 deletions
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49
arch/parisc/kernel/process.c
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@@ -202,46 +202,10 @@ int dump_task_fpu (struct task_struct *tsk, elf_fpregset_t *r)
return 1;
}
/* Note that "fork()" is implemented in terms of clone, with
parameters (SIGCHLD, regs->gr[30], regs). */
int
sys_clone(unsigned long clone_flags, unsigned long usp,
struct pt_regs *regs)
{
/* Arugments from userspace are:
r26 = Clone flags.
r25 = Child stack.
r24 = parent_tidptr.
r23 = Is the TLS storage descriptor
r22 = child_tidptr
However, these last 3 args are only examined
if the proper flags are set. */
int __user *parent_tidptr = (int __user *)regs->gr[24];
int __user *child_tidptr = (int __user *)regs->gr[22];
/* usp must be word aligned. This also prevents users from
* passing in the value 1 (which is the signal for a special
* return for a kernel thread) */
usp = ALIGN(usp, 4);
/* A zero value for usp means use the current stack */
if (usp == 0)
usp = regs->gr[30];
return do_fork(clone_flags, usp, regs, 0, parent_tidptr, child_tidptr);
}
int
sys_vfork(struct pt_regs *regs)
{
return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->gr[30], regs, 0, NULL, NULL);
}
int
copy_thread(unsigned long clone_flags, unsigned long usp,
unsigned long arg,
struct task_struct *p, struct pt_regs *pregs)
struct task_struct *p, struct pt_regs *unused)
{
struct pt_regs * cregs = &(p->thread.regs);
void *stack = task_stack_page(p);
@@ -278,7 +242,14 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
cregs->gr[25] = arg;
} else {
/* user thread */
cregs->gr[30] = usp;
/* usp must be word aligned. This also prevents users from
* passing in the value 1 (which is the signal for a special
* return for a kernel thread) */
if (usp) {
usp = ALIGN(usp, 4);
if (likely(usp))
cregs->gr[30] = usp;
}
cregs->ksp = (unsigned long)stack + THREAD_SZ_ALGN + FRAME_SIZE;
if (personality(p->personality) == PER_HPUX) {
#ifdef CONFIG_HPUX
@@ -291,7 +262,7 @@ copy_thread(unsigned long clone_flags, unsigned long usp,
}
/* Setup thread TLS area from the 4th parameter in clone */
if (clone_flags & CLONE_SETTLS)
cregs->cr27 = pregs->gr[23];
cregs->cr27 = cregs->gr[23];
}
return 0;