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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 "kernel.h"
- asmlinkage long sparc_fork(struct pt_regs *regs)
- {
- unsigned long orig_i1 = regs->u_regs[UREG_I1];
- long ret;
- struct kernel_clone_args args = {
- .exit_signal = SIGCHLD,
- /* Reuse the parent's stack for the child. */
- .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 = regs->u_regs[UREG_I1];
- long ret;
- struct kernel_clone_args args = {
- .flags = CLONE_VFORK | CLONE_VM,
- .exit_signal = SIGCHLD,
- /* Reuse the parent's stack for the child. */
- .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 = regs->u_regs[UREG_I1];
- unsigned int flags = lower_32_bits(regs->u_regs[UREG_I0]);
- long ret;
- struct kernel_clone_args args = {
- .flags = (flags & ~CSIGNAL),
- .exit_signal = (flags & CSIGNAL),
- .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;
- }
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