arch/m32r/kernel/process.c

   1 /*
   2  *  linux/arch/m32r/kernel/process.c
   3  *
   4  *  Copyright (c) 2001, 2002  Hiroyuki Kondo, Hirokazu Takata,
   5  *                            Hitoshi Yamamoto
   6  *  Taken from sh version.
   7  *    Copyright (C) 1995  Linus Torvalds
   8  *    SuperH version:  Copyright (C) 1999, 2000  Niibe Yutaka & Kaz Kojima
   9  */
  10
  11 #undef DEBUG_PROCESS
  12 #ifdef DEBUG_PROCESS
  13 #define DPRINTK(fmt, args...)  printk("%s:%d:%s: " fmt, __FILE__, __LINE__, \
  14   __func__, ##args)
  15 #else
  16 #define DPRINTK(fmt, args...)
  17 #endif
  18
  19 /*
  20  * This file handles the architecture-dependent parts of process handling..
  21  */
  22
  23 #include <linux/fs.h>
  24 #include <linux/slab.h>
  25 #include <linux/sched/debug.h>
  26 #include <linux/sched/task.h>
  27 #include <linux/sched/task_stack.h>
  28 #include <linux/module.h>
  29 #include <linux/ptrace.h>
  30 #include <linux/unistd.h>
  31 #include <linux/hardirq.h>
  32 #include <linux/rcupdate.h>
  33
  34 #include <asm/io.h>
  35 #include <linux/uaccess.h>
  36 #include <asm/mmu_context.h>
  37 #include <asm/elf.h>
  38 #include <asm/m32r.h>
  39
  40 #include <linux/err.h>
  41
  42 /*
  43  * Return saved PC of a blocked thread.
  44  */
  45 unsigned long thread_saved_pc(struct task_struct *tsk)
  46 {
  47         return tsk->thread.lr;
  48 }
  49
  50 void (*pm_power_off)(void) = NULL;
  51 EXPORT_SYMBOL(pm_power_off);
  52
  53 void machine_restart(char *__unused)
  54 {
  55 #if defined(CONFIG_PLAT_MAPPI3)
  56         outw(1, (unsigned long)PLD_REBOOT);
  57 #endif
  58
  59         printk("Please push reset button!\n");
  60         while (1)
  61                 cpu_relax();
  62 }
  63
  64 void machine_halt(void)
  65 {
  66         printk("Please push reset button!\n");
  67         while (1)
  68                 cpu_relax();
  69 }
  70
  71 void machine_power_off(void)
  72 {
  73         /* M32R_FIXME */
  74 }
  75
  76 void show_regs(struct pt_regs * regs)
  77 {
  78         printk("\n");
  79         show_regs_print_info(KERN_DEFAULT);
  80
  81         printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
  82           regs->bpc, regs->psw, regs->lr, regs->fp);
  83         printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
  84           regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
  85         printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
  86           regs->r0, regs->r1, regs->r2, regs->r3);
  87         printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
  88           regs->r4, regs->r5, regs->r6, regs->r7);
  89         printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
  90           regs->r8, regs->r9, regs->r10, regs->r11);
  91         printk("R12[%08lx]\n", \
  92           regs->r12);
  93
  94 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
  95         printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
  96           regs->acc0h, regs->acc0l);
  97         printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
  98           regs->acc1h, regs->acc1l);
  99 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
 100         printk("ACCH[%08lx]:ACCL[%08lx]\n", \
 101           regs->acc0h, regs->acc0l);
 102 #else
 103 #error unknown isa configuration
 104 #endif
 105 }
 106
 107 void flush_thread(void)
 108 {
 109         DPRINTK("pid = %d\n", current->pid);
 110         memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));
 111 }
 112
 113 void release_thread(struct task_struct *dead_task)
 114 {
 115         /* do nothing */
 116         DPRINTK("pid = %d\n", dead_task->pid);
 117 }
 118
 119 /* Fill in the fpu structure for a core dump.. */
 120 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 121 {
 122         return 0; /* Task didn't use the fpu at all. */
 123 }
 124
 125 int copy_thread(unsigned long clone_flags, unsigned long spu,
 126         unsigned long arg, struct task_struct *tsk)
 127 {
 128         struct pt_regs *childregs = task_pt_regs(tsk);
 129         extern void ret_from_fork(void);
 130         extern void ret_from_kernel_thread(void);
 131
 132         if (unlikely(tsk->flags & PF_KTHREAD)) {
 133                 memset(childregs, 0, sizeof(struct pt_regs));
 134                 childregs->psw = M32R_PSW_BIE;
 135                 childregs->r1 = spu;    /* fn */
 136                 childregs->r0 = arg;
 137                 tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
 138         } else {
 139                 /* Copy registers */
 140                 *childregs = *current_pt_regs();
 141                 if (spu)
 142                         childregs->spu = spu;
 143                 childregs->r0 = 0;      /* Child gets zero as return value */
 144                 tsk->thread.lr = (unsigned long)ret_from_fork;
 145         }
 146         tsk->thread.sp = (unsigned long)childregs;
 147
 148         return 0;
 149 }
 150
 151 /*
 152  * These bracket the sleeping functions..
 153  */
 154 #define first_sched     ((unsigned long) scheduling_functions_start_here)
 155 #define last_sched      ((unsigned long) scheduling_functions_end_here)
 156
 157 unsigned long get_wchan(struct task_struct *p)
 158 {
 159         /* M32R_FIXME */
 160         return (0);
 161 }