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 void (*pm_power_off)(void) = NULL;
  43 EXPORT_SYMBOL(pm_power_off);
  44
  45 void machine_restart(char *__unused)
  46 {
  47 #if defined(CONFIG_PLAT_MAPPI3)
  48         outw(1, (unsigned long)PLD_REBOOT);
  49 #endif
  50
  51         printk("Please push reset button!\n");
  52         while (1)
  53                 cpu_relax();
  54 }
  55
  56 void machine_halt(void)
  57 {
  58         printk("Please push reset button!\n");
  59         while (1)
  60                 cpu_relax();
  61 }
  62
  63 void machine_power_off(void)
  64 {
  65         /* M32R_FIXME */
  66 }
  67
  68 void show_regs(struct pt_regs * regs)
  69 {
  70         printk("\n");
  71         show_regs_print_info(KERN_DEFAULT);
  72
  73         printk("BPC[%08lx]:PSW[%08lx]:LR [%08lx]:FP [%08lx]\n", \
  74           regs->bpc, regs->psw, regs->lr, regs->fp);
  75         printk("BBPC[%08lx]:BBPSW[%08lx]:SPU[%08lx]:SPI[%08lx]\n", \
  76           regs->bbpc, regs->bbpsw, regs->spu, regs->spi);
  77         printk("R0 [%08lx]:R1 [%08lx]:R2 [%08lx]:R3 [%08lx]\n", \
  78           regs->r0, regs->r1, regs->r2, regs->r3);
  79         printk("R4 [%08lx]:R5 [%08lx]:R6 [%08lx]:R7 [%08lx]\n", \
  80           regs->r4, regs->r5, regs->r6, regs->r7);
  81         printk("R8 [%08lx]:R9 [%08lx]:R10[%08lx]:R11[%08lx]\n", \
  82           regs->r8, regs->r9, regs->r10, regs->r11);
  83         printk("R12[%08lx]\n", \
  84           regs->r12);
  85
  86 #if defined(CONFIG_ISA_M32R2) && defined(CONFIG_ISA_DSP_LEVEL2)
  87         printk("ACC0H[%08lx]:ACC0L[%08lx]\n", \
  88           regs->acc0h, regs->acc0l);
  89         printk("ACC1H[%08lx]:ACC1L[%08lx]\n", \
  90           regs->acc1h, regs->acc1l);
  91 #elif defined(CONFIG_ISA_M32R2) || defined(CONFIG_ISA_M32R)
  92         printk("ACCH[%08lx]:ACCL[%08lx]\n", \
  93           regs->acc0h, regs->acc0l);
  94 #else
  95 #error unknown isa configuration
  96 #endif
  97 }
  98
  99 void flush_thread(void)
 100 {
 101         DPRINTK("pid = %d\n", current->pid);
 102         memset(&current->thread.debug_trap, 0, sizeof(struct debug_trap));
 103 }
 104
 105 void release_thread(struct task_struct *dead_task)
 106 {
 107         /* do nothing */
 108         DPRINTK("pid = %d\n", dead_task->pid);
 109 }
 110
 111 /* Fill in the fpu structure for a core dump.. */
 112 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu)
 113 {
 114         return 0; /* Task didn't use the fpu at all. */
 115 }
 116
 117 int copy_thread(unsigned long clone_flags, unsigned long spu,
 118         unsigned long arg, struct task_struct *tsk)
 119 {
 120         struct pt_regs *childregs = task_pt_regs(tsk);
 121         extern void ret_from_fork(void);
 122         extern void ret_from_kernel_thread(void);
 123
 124         if (unlikely(tsk->flags & PF_KTHREAD)) {
 125                 memset(childregs, 0, sizeof(struct pt_regs));
 126                 childregs->psw = M32R_PSW_BIE;
 127                 childregs->r1 = spu;    /* fn */
 128                 childregs->r0 = arg;
 129                 tsk->thread.lr = (unsigned long)ret_from_kernel_thread;
 130         } else {
 131                 /* Copy registers */
 132                 *childregs = *current_pt_regs();
 133                 if (spu)
 134                         childregs->spu = spu;
 135                 childregs->r0 = 0;      /* Child gets zero as return value */
 136                 tsk->thread.lr = (unsigned long)ret_from_fork;
 137         }
 138         tsk->thread.sp = (unsigned long)childregs;
 139
 140         return 0;
 141 }
 142
 143 /*
 144  * These bracket the sleeping functions..
 145  */
 146 #define first_sched     ((unsigned long) scheduling_functions_start_here)
 147 #define last_sched      ((unsigned long) scheduling_functions_end_here)
 148
 149 unsigned long get_wchan(struct task_struct *p)
 150 {
 151         /* M32R_FIXME */
 152         return (0);
 153 }