^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) * linux/arch/h8300/kernel/process.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Yoshinori Sato <ysato@users.sourceforge.jp>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Based on:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * linux/arch/m68knommu/kernel/process.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Kenneth Albanowski <kjahds@kjahds.com>,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * The Silver Hammer Group, Ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * linux/arch/m68k/kernel/process.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Copyright (C) 1995 Hamish Macdonald
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * 68060 fixes by Jesper Skov
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * This file handles the architecture-dependent parts of process handling..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/sched/debug.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/sched/task.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/sched/task_stack.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/user.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <linux/reboot.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <asm/traps.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) #include <asm/setup.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) void (*pm_power_off)(void) = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) EXPORT_SYMBOL(pm_power_off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) asmlinkage void ret_from_fork(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) asmlinkage void ret_from_kernel_thread(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * The idle loop on an H8/300..
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) void arch_cpu_idle(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) raw_local_irq_enable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) __asm__("sleep");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) void machine_restart(char *__unused)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) __asm__("jmp @@0");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) void machine_halt(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) __asm__("sleep");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) for (;;)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) ;
^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) void machine_power_off(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) local_irq_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) __asm__("sleep");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) for (;;)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) void show_regs(struct pt_regs *regs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) show_regs_print_info(KERN_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) pr_notice("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) pr_notice("PC: %08lx Status: %02x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) regs->pc, regs->ccr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) regs->orig_er0, regs->er0, regs->er1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) regs->er2, regs->er3, regs->er4, regs->er5);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) pr_notice("ER6' %08lx ", regs->er6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) if (user_mode(regs))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) printk("USP: %08lx\n", rdusp());
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) printk("\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) void flush_thread(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) int copy_thread(unsigned long clone_flags, unsigned long usp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) unsigned long topstk, struct task_struct *p, unsigned long tls)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct pt_regs *childregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (unlikely(p->flags & PF_KTHREAD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) memset(childregs, 0, sizeof(struct pt_regs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) childregs->retpc = (unsigned long) ret_from_kernel_thread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) childregs->er4 = topstk; /* arg */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) childregs->er5 = usp; /* fn */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) *childregs = *current_pt_regs();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) childregs->er0 = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) childregs->retpc = (unsigned long) ret_from_fork;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) p->thread.usp = usp ?: rdusp();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) p->thread.ksp = (unsigned long)childregs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) unsigned long get_wchan(struct task_struct *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) unsigned long fp, pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) unsigned long stack_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) int count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (!p || p == current || p->state == TASK_RUNNING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) stack_page = (unsigned long)p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) fp = ((struct pt_regs *)p->thread.ksp)->er6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (fp < stack_page+sizeof(struct thread_info) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) fp >= 8184+stack_page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) pc = ((unsigned long *)fp)[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) if (!in_sched_functions(pc))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) return pc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) fp = *(unsigned long *) fp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) } while (count++ < 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) /* generic sys_clone is not enough registers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) asmlinkage int sys_clone(unsigned long __user *args)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) unsigned long clone_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) unsigned long newsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) uintptr_t parent_tidptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) uintptr_t child_tidptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) struct kernel_clone_args kargs = {};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) get_user(clone_flags, &args[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) get_user(newsp, &args[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) get_user(parent_tidptr, &args[2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) get_user(child_tidptr, &args[3]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) kargs.flags = (lower_32_bits(clone_flags) & ~CSIGNAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) kargs.pidfd = (int __user *)parent_tidptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) kargs.child_tid = (int __user *)child_tidptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) kargs.parent_tid = (int __user *)parent_tidptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) kargs.exit_signal = (lower_32_bits(clone_flags) & CSIGNAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) kargs.stack = newsp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) return kernel_clone(&kargs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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