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Diffstat (limited to '')
| -rw-r--r-- | arch/h8300/kernel/process.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/arch/h8300/kernel/process.c b/arch/h8300/kernel/process.c new file mode 100644 index 000000000..46b1342ce --- /dev/null +++ b/arch/h8300/kernel/process.c @@ -0,0 +1,176 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * linux/arch/h8300/kernel/process.c + * + * Yoshinori Sato <ysato@users.sourceforge.jp> + * + * Based on: + * + * linux/arch/m68knommu/kernel/process.c + * + * Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>, + * Kenneth Albanowski <kjahds@kjahds.com>, + * The Silver Hammer Group, Ltd. + * + * linux/arch/m68k/kernel/process.c + * + * Copyright (C) 1995 Hamish Macdonald + * + * 68060 fixes by Jesper Skov + */ + +/* + * This file handles the architecture-dependent parts of process handling.. + */ + +#include <linux/errno.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/sched/debug.h> +#include <linux/sched/task.h> +#include <linux/sched/task_stack.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/smp.h> +#include <linux/stddef.h> +#include <linux/unistd.h> +#include <linux/ptrace.h> +#include <linux/user.h> +#include <linux/interrupt.h> +#include <linux/reboot.h> +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/rcupdate.h> + +#include <linux/uaccess.h> +#include <asm/traps.h> +#include <asm/setup.h> + +void (*pm_power_off)(void) = NULL; +EXPORT_SYMBOL(pm_power_off); + +asmlinkage void ret_from_fork(void); +asmlinkage void ret_from_kernel_thread(void); + +/* + * The idle loop on an H8/300.. + */ +void arch_cpu_idle(void) +{ + raw_local_irq_enable(); + __asm__("sleep"); +} + +void machine_restart(char *__unused) +{ + local_irq_disable(); + __asm__("jmp @@0"); +} + +void machine_halt(void) +{ + local_irq_disable(); + __asm__("sleep"); + for (;;) + ; +} + +void machine_power_off(void) +{ + local_irq_disable(); + __asm__("sleep"); + for (;;) + ; +} + +void show_regs(struct pt_regs *regs) +{ + show_regs_print_info(KERN_DEFAULT); + + pr_notice("\n"); + pr_notice("PC: %08lx Status: %02x\n", + regs->pc, regs->ccr); + pr_notice("ORIG_ER0: %08lx ER0: %08lx ER1: %08lx\n", + regs->orig_er0, regs->er0, regs->er1); + pr_notice("ER2: %08lx ER3: %08lx ER4: %08lx ER5: %08lx\n", + regs->er2, regs->er3, regs->er4, regs->er5); + pr_notice("ER6' %08lx ", regs->er6); + if (user_mode(regs)) + printk("USP: %08lx\n", rdusp()); + else + printk("\n"); +} + +void flush_thread(void) +{ +} + +int copy_thread(unsigned long clone_flags, unsigned long usp, + unsigned long topstk, struct task_struct *p, unsigned long tls) +{ + struct pt_regs *childregs; + + childregs = (struct pt_regs *) (THREAD_SIZE + task_stack_page(p)) - 1; + + if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) { + memset(childregs, 0, sizeof(struct pt_regs)); + childregs->retpc = (unsigned long) ret_from_kernel_thread; + childregs->er4 = topstk; /* arg */ + childregs->er5 = usp; /* fn */ + } else { + *childregs = *current_pt_regs(); + childregs->er0 = 0; + childregs->retpc = (unsigned long) ret_from_fork; + p->thread.usp = usp ?: rdusp(); + } + p->thread.ksp = (unsigned long)childregs; + + return 0; +} + +unsigned long get_wchan(struct task_struct *p) +{ + unsigned long fp, pc; + unsigned long stack_page; + int count = 0; + + if (!p || p == current || p->state == TASK_RUNNING) + return 0; + + stack_page = (unsigned long)p; + fp = ((struct pt_regs *)p->thread.ksp)->er6; + do { + if (fp < stack_page+sizeof(struct thread_info) || + fp >= 8184+stack_page) + return 0; + pc = ((unsigned long *)fp)[1]; + if (!in_sched_functions(pc)) + return pc; + fp = *(unsigned long *) fp; + } while (count++ < 16); + return 0; +} + +/* generic sys_clone is not enough registers */ +asmlinkage int sys_clone(unsigned long __user *args) +{ + unsigned long clone_flags; + unsigned long newsp; + uintptr_t parent_tidptr; + uintptr_t child_tidptr; + struct kernel_clone_args kargs = {}; + + get_user(clone_flags, &args[0]); + get_user(newsp, &args[1]); + get_user(parent_tidptr, &args[2]); + get_user(child_tidptr, &args[3]); + + kargs.flags = (lower_32_bits(clone_flags) & ~CSIGNAL); + kargs.pidfd = (int __user *)parent_tidptr; + kargs.child_tid = (int __user *)child_tidptr; + kargs.parent_tid = (int __user *)parent_tidptr; + kargs.exit_signal = (lower_32_bits(clone_flags) & CSIGNAL); + kargs.stack = newsp; + + return kernel_clone(&kargs); +} |