1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 | // 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); } |