LXR linux/arch/m32r/kernel/process.c

   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  linux/arch/m32r/kernel/process.c
   4 *
   5 *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata,
   6 *                            Hitoshi Yamamoto
   7 *  Taken from sh version.
   8 *    Copyright (C) 1995  Linus Torvalds
   9 *    SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
  10 */
  11
  12#undef DEBUG_PROCESS
  13#ifdef DEBUG_PROCESS
  14#define DPRINTK(fmt, args...)  printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
  15  __func__, ##args)
  16#else
  17#define DPRINTK(fmt, args...)
  18#endif
  19
  20/*
  21 * This file handles the architecture-dependent parts of process handling..
  22 */
  23
  24#include <linux/fs.h>
  25#include <linux/slab.h>
  26#include <linux/sched/debug.h>
  27#include <linux/sched/task.h>
  28#include <linux/sched/task_stack.h>
  29#include <linux/module.h>
  30#include <linux/ptrace.h>
  31#include <linux/unistd.h>
  32#include <linux/hardirq.h>
  33#include <linux/rcupdate.h>
  34
  35#include <asm/io.h>
  36#include <linux/uaccess.h>
  37#include <asm/mmu_context.h>
  38#include <asm/elf.h>
  39#include <asm/m32r.h>
  40
  41#include <linux/err.h>
  42
  43void (*pm_power_off)(void) = NULL;
  44EXPORT_SYMBOL(pm_power_off);
  45
  46void machine_restart(char *__unused)
  47{
  48#if defined(CONFIG_PLAT_MAPPI3)
  49        outw(1, (unsigned long)PLD_REBOOT);
  50#endif
  51
  52        printk("Please push reset button!\n");
  53        while (1)
  54                cpu_relax();
  55}
  56
  57void machine_halt(void)
  58{
  59        printk("Please push reset button!\n");
  60        while (1)
  61                cpu_relax();
  62}
  63
  64void machine_power_off(void)
  65{
  66        /* M32R_FIXME */
  67}
  68
  69void show_regs(struct pt_regs * regs)
  70{
  71        printk("\n");
  72        show_regs_print_info(KERN_DEFAULT);
  73
  74        printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
  75          regs->bpc, regs->psw, regs->lr, regs->fp);
  76        printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
  77          regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
  78        printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
  79          regs->r0, regs->r1, regs->r2, regs->r3);
  80        printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
  81          regs->r4, regs->r5, regs->r6, regs->r7);
  82        printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
  83          regs->r8, regs->r9, regs->r10, regs->r11);
  84        printk("R12[%08lx]\n", \
  85          regs->r12);
  86
  87#if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
  88        printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
  89          regs->acc0h, regs->acc0l);
  90        printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
  91          regs->acc1h, regs->acc1l);
  92#elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
  93        printk("ACCH[%08lx]:ACCL[%08lx]\n", \
  94          regs->acc0h, regs->acc0l);
  95#else
  96#error unknown isa configuration
  97#endif
  98}
  99
 100void flush_thread(void)
 101{
 102        DPRINTK("pid = %d\n", current->pid);
 103        memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));
 104}
 105
 106void release_thread(struct task_struct *dead_task)
 107{
 108        /* do nothing */
 109        DPRINTK("pid = %d\n", dead_task->pid);
 110}
 111
 112/* Fill in the fpu structure for a core dump.. */
 113int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 114{
 115        return 0; /* Task didn't use the fpu at all. */
 116}
 117
 118int copy_thread(unsigned long clone_flags, unsigned long spu,
 119        unsigned long arg, struct task_struct *tsk)
 120{
 121        struct pt_regs *childregs = task_pt_regs(tsk);
 122        extern void ret_from_fork(void);
 123        extern void ret_from_kernel_thread(void);
 124
 125        if (unlikely(tsk->flags & PF_KTHREAD)) {
 126                memset(childregs, 0, sizeof(struct pt_regs));
 127                childregs->psw = M32R_PSW_BIE;
 128                childregs->r1 = spu;    /* fn */
 129                childregs->r0 = arg;
 130                tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
 131        } else {
 132                /* Copy registers */
 133                *childregs = *current_pt_regs();
 134                if (spu)
 135                        childregs->spu = spu;
 136                childregs->r0 = 0;      /* Child gets zero as return value */
 137                tsk->thread.lr = (unsigned long)ret_from_fork;
 138        }
 139        tsk->thread.sp = (unsigned long)childregs;
 140
 141        return 0;
 142}
 143
 144/*
 145 * These bracket the sleeping functions..
 146 */
 147#define first_sched     ((unsigned long) scheduling_functions_start_here)
 148#define last_sched      ((unsigned long) scheduling_functions_end_here)
 149
 150unsigned long get_wchan(struct task_struct *p)
 151{
 152        /* M32R_FIXME */
 153        return (0);
 154}
 155