^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * This file handles the architecture independent parts of process handling..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/compat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/sched/task.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/signal.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include "kernel.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) asmlinkage long sparc_fork(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) unsigned long orig_i1 = regs->u_regs[UREG_I1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct kernel_clone_args args = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) .exit_signal = SIGCHLD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) /* Reuse the parent's stack for the child. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) .stack = regs->u_regs[UREG_FP],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) ret = kernel_clone(&args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) /* If we get an error and potentially restart the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * call, we're screwed because copy_thread() clobbered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * the parent's %o1. So detect that case and restore it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) regs->u_regs[UREG_I1] = orig_i1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) asmlinkage long sparc_vfork(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) unsigned long orig_i1 = regs->u_regs[UREG_I1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) struct kernel_clone_args args = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) .flags = CLONE_VFORK | CLONE_VM,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) .exit_signal = SIGCHLD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) /* Reuse the parent's stack for the child. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) .stack = regs->u_regs[UREG_FP],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) ret = kernel_clone(&args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /* If we get an error and potentially restart the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * call, we're screwed because copy_thread() clobbered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * the parent's %o1. So detect that case and restore it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) regs->u_regs[UREG_I1] = orig_i1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) asmlinkage long sparc_clone(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) unsigned long orig_i1 = regs->u_regs[UREG_I1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) unsigned int flags = lower_32_bits(regs->u_regs[UREG_I0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) long ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) struct kernel_clone_args args = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) .flags = (flags & ~CSIGNAL),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) .exit_signal = (flags & CSIGNAL),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) .tls = regs->u_regs[UREG_I3],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) #ifdef CONFIG_COMPAT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (test_thread_flag(TIF_32BIT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) args.pidfd = compat_ptr(regs->u_regs[UREG_I2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) args.child_tid = compat_ptr(regs->u_regs[UREG_I4]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) args.parent_tid = compat_ptr(regs->u_regs[UREG_I2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) args.pidfd = (int __user *)regs->u_regs[UREG_I2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) args.child_tid = (int __user *)regs->u_regs[UREG_I4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) args.parent_tid = (int __user *)regs->u_regs[UREG_I2];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) /* Did userspace give setup a separate stack for the child or are we
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * reusing the parent's?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) if (regs->u_regs[UREG_I1])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) args.stack = regs->u_regs[UREG_I1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) args.stack = regs->u_regs[UREG_FP];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) ret = kernel_clone(&args);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) /* If we get an error and potentially restart the system
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * call, we're screwed because copy_thread() clobbered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) * the parent's %o1. So detect that case and restore it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) * here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) if ((unsigned long)ret >= -ERESTART_RESTARTBLOCK)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) regs->u_regs[UREG_I1] = orig_i1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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