diff options
Diffstat (limited to 'arch/parisc/kernel/process.c')
| -rw-r--r-- | arch/parisc/kernel/process.c | 49 |
1 files changed, 10 insertions, 39 deletions
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c index 38db36f6430..9753ecf49a0 100644 --- a/arch/parisc/kernel/process.c +++ b/arch/parisc/kernel/process.c @@ -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; |