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2153b2e891
Add support for the clone3 system call to the SPARC architectures. The implementation follows the pattern of the original clone syscall. However, instead of explicitly calling kernel_clone, the clone3 handler calls the generic sys_clone3 handler in kernel/fork. In case no stack is provided, the parents stack is reused. The return value convention for clone3 follows the regular kernel return value convention (in contrast to the original clone/fork on SPARC). Closes: https://github.com/sparclinux/issues/issues/10 Signed-off-by: Ludwig Rydberg <ludwig.rydberg@gaisler.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Andreas Larsson <andreas@gaisler.com> Tested-by: Andreas Larsson <andreas@gaisler.com> Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Link: https://lore.kernel.org/r/20260119144753.27945-3-ludwig.rydberg@gaisler.com Signed-off-by: Andreas Larsson <andreas@gaisler.com>
135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This file handles the architecture independent parts of process handling..
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*/
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#include <linux/compat.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/ptrace.h>
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#include <linux/sched.h>
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#include <linux/sched/task.h>
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#include <linux/sched/task_stack.h>
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#include <linux/signal.h>
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#include <linux/syscalls.h>
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#include "kernel.h"
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asmlinkage long sparc_fork(struct pt_regs *regs)
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{
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unsigned long orig_i1;
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long ret;
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struct kernel_clone_args args = {
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.exit_signal = SIGCHLD,
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};
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synchronize_user_stack();
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orig_i1 = regs->u_regs[UREG_I1];
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/* Reuse the parent's stack for the child. */
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args.stack = regs->u_regs[UREG_FP];
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ret = kernel_clone(&args);
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/* If we get an error and potentially restart the system
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* call, we're screwed because copy_thread() clobbered
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* the parent's %o1. So detect that case and restore it
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* here.
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*/
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if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
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regs->u_regs[UREG_I1] = orig_i1;
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return ret;
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}
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asmlinkage long sparc_vfork(struct pt_regs *regs)
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{
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unsigned long orig_i1;
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long ret;
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struct kernel_clone_args args = {
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.flags = CLONE_VFORK | CLONE_VM,
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.exit_signal = SIGCHLD,
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};
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synchronize_user_stack();
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orig_i1 = regs->u_regs[UREG_I1];
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/* Reuse the parent's stack for the child. */
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args.stack = regs->u_regs[UREG_FP];
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ret = kernel_clone(&args);
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/* If we get an error and potentially restart the system
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* call, we're screwed because copy_thread() clobbered
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* the parent's %o1. So detect that case and restore it
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* here.
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*/
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if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
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regs->u_regs[UREG_I1] = orig_i1;
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return ret;
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}
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asmlinkage long sparc_clone(struct pt_regs *regs)
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{
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unsigned long orig_i1;
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unsigned int flags;
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long ret;
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struct kernel_clone_args args = {0};
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synchronize_user_stack();
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orig_i1 = regs->u_regs[UREG_I1];
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flags = lower_32_bits(regs->u_regs[UREG_I0]);
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args.flags = (flags & ~CSIGNAL);
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args.exit_signal = (flags & CSIGNAL);
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args.tls = regs->u_regs[UREG_I3];
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#ifdef CONFIG_COMPAT
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if (test_thread_flag(TIF_32BIT)) {
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args.pidfd = compat_ptr(regs->u_regs[UREG_I2]);
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args.child_tid = compat_ptr(regs->u_regs[UREG_I4]);
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args.parent_tid = compat_ptr(regs->u_regs[UREG_I2]);
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} else
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#endif
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{
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args.pidfd = (int __user *)regs->u_regs[UREG_I2];
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args.child_tid = (int __user *)regs->u_regs[UREG_I4];
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args.parent_tid = (int __user *)regs->u_regs[UREG_I2];
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}
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/* Did userspace give setup a separate stack for the child or are we
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* reusing the parent's?
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*/
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if (regs->u_regs[UREG_I1])
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args.stack = regs->u_regs[UREG_I1];
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else
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args.stack = regs->u_regs[UREG_FP];
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ret = kernel_clone(&args);
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/* If we get an error and potentially restart the system
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* call, we're screwed because copy_thread() clobbered
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* the parent's %o1. So detect that case and restore it
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* here.
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*/
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if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
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regs->u_regs[UREG_I1] = orig_i1;
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return ret;
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}
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asmlinkage long sparc_clone3(struct pt_regs *regs)
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{
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unsigned long sz;
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struct clone_args __user *cl_args;
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synchronize_user_stack();
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cl_args = (struct clone_args __user *)regs->u_regs[UREG_I0];
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sz = regs->u_regs[UREG_I1];
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return sys_clone3(cl_args, sz);
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}
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