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// SPDX-License-Identifier: GPL-2.0
/*
* This file handles the architecture independent parts of process handling..
*/
#include <linux/compat.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/sched/task.h>
#include <linux/sched/task_stack.h>
#include <linux/signal.h>
#include <linux/syscalls.h>
#include "kernel.h"
asmlinkage long sparc_fork(struct pt_regs *regs)
{
unsigned long orig_i1;
long ret;
struct kernel_clone_args args = {
.exit_signal = SIGCHLD,
};
synchronize_user_stack();
orig_i1 = regs->u_regs[UREG_I1];
/* Reuse the parent's stack for the child. */
args.stack = regs->u_regs[UREG_FP];
ret = kernel_clone(&args);
/* If we get an error and potentially restart the system
* call, we're screwed because copy_thread() clobbered
* the parent's %o1. So detect that case and restore it
* here.
*/
if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
regs->u_regs[UREG_I1] = orig_i1;
return ret;
}
asmlinkage long sparc_vfork(struct pt_regs *regs)
{
unsigned long orig_i1;
long ret;
struct kernel_clone_args args = {
.flags = CLONE_VFORK | CLONE_VM,
.exit_signal = SIGCHLD,
};
synchronize_user_stack();
orig_i1 = regs->u_regs[UREG_I1];
/* Reuse the parent's stack for the child. */
args.stack = regs->u_regs[UREG_FP];
ret = kernel_clone(&args);
/* If we get an error and potentially restart the system
* call, we're screwed because copy_thread() clobbered
* the parent's %o1. So detect that case and restore it
* here.
*/
if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
regs->u_regs[UREG_I1] = orig_i1;
return ret;
}
asmlinkage long sparc_clone(struct pt_regs *regs)
{
unsigned long orig_i1;
unsigned int flags;
long ret;
struct kernel_clone_args args = {0};
synchronize_user_stack();
orig_i1 = regs->u_regs[UREG_I1];
flags = lower_32_bits(regs->u_regs[UREG_I0]);
args.flags = (flags & ~CSIGNAL);
args.exit_signal = (flags & CSIGNAL);
args.tls = regs->u_regs[UREG_I3];
#ifdef CONFIG_COMPAT
if (test_thread_flag(TIF_32BIT)) {
args.pidfd = compat_ptr(regs->u_regs[UREG_I2]);
args.child_tid = compat_ptr(regs->u_regs[UREG_I4]);
args.parent_tid = compat_ptr(regs->u_regs[UREG_I2]);
} else
#endif
{
args.pidfd = (int __user *)regs->u_regs[UREG_I2];
args.child_tid = (int __user *)regs->u_regs[UREG_I4];
args.parent_tid = (int __user *)regs->u_regs[UREG_I2];
}
/* Did userspace give setup a separate stack for the child or are we
* reusing the parent's?
*/
if (regs->u_regs[UREG_I1])
args.stack = regs->u_regs[UREG_I1];
else
args.stack = regs->u_regs[UREG_FP];
ret = kernel_clone(&args);
/* If we get an error and potentially restart the system
* call, we're screwed because copy_thread() clobbered
* the parent's %o1. So detect that case and restore it
* here.
*/
if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
regs->u_regs[UREG_I1] = orig_i1;
return ret;
}
asmlinkage long sparc_clone3(struct pt_regs *regs)
{
unsigned long sz;
struct clone_args __user *cl_args;
synchronize_user_stack();
cl_args = (struct clone_args __user *)regs->u_regs[UREG_I0];
sz = regs->u_regs[UREG_I1];
return sys_clone3(cl_args, sz);
}
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