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