hwmon: (jc42) Change detection class
[linux/fpc-iii.git] / arch / h8300 / platform / h8s / ptrace_h8s.c
blobc058ab1a8495923e541bd57a339b1858b40b9518
1 /*
2 * linux/arch/h8300/platform/h8s/ptrace_h8s.c
3 * ptrace cpu depend helper functions
5 * Yoshinori Sato <ysato@users.sourceforge.jp>
7 * This file is subject to the terms and conditions of the GNU General
8 * Public License. See the file COPYING in the main directory of
9 * this archive for more details.
12 #include <linux/linkage.h>
13 #include <linux/sched.h>
14 #include <linux/errno.h>
15 #include <asm/ptrace.h>
17 #define CCR_MASK 0x6f
18 #define EXR_TRACE 0x80
20 /* Mapping from PT_xxx to the stack offset at which the register is
21 saved. Notice that usp has no stack-slot and needs to be treated
22 specially (see get_reg/put_reg below). */
23 static const int h8300_register_offset[] = {
24 PT_REG(er1), PT_REG(er2), PT_REG(er3), PT_REG(er4),
25 PT_REG(er5), PT_REG(er6), PT_REG(er0), PT_REG(orig_er0),
26 PT_REG(ccr), PT_REG(pc), 0, PT_REG(exr)
29 /* read register */
30 long h8300_get_reg(struct task_struct *task, int regno)
32 switch (regno) {
33 case PT_USP:
34 return task->thread.usp + sizeof(long)*2 + 2;
35 case PT_CCR:
36 case PT_EXR:
37 return *(unsigned short *)(task->thread.esp0 + h8300_register_offset[regno]);
38 default:
39 return *(unsigned long *)(task->thread.esp0 + h8300_register_offset[regno]);
43 /* write register */
44 int h8300_put_reg(struct task_struct *task, int regno, unsigned long data)
46 unsigned short oldccr;
47 switch (regno) {
48 case PT_USP:
49 task->thread.usp = data - sizeof(long)*2 - 2;
50 case PT_CCR:
51 oldccr = *(unsigned short *)(task->thread.esp0 + h8300_register_offset[regno]);
52 oldccr &= ~CCR_MASK;
53 data &= CCR_MASK;
54 data |= oldccr;
55 *(unsigned short *)(task->thread.esp0 + h8300_register_offset[regno]) = data;
56 break;
57 case PT_EXR:
58 /* exr modify not support */
59 return -EIO;
60 default:
61 *(unsigned long *)(task->thread.esp0 + h8300_register_offset[regno]) = data;
62 break;
64 return 0;
67 /* disable singlestep */
68 void user_disable_single_step(struct task_struct *child)
70 *(unsigned short *)(child->thread.esp0 + h8300_register_offset[PT_EXR]) &= ~EXR_TRACE;
73 /* enable singlestep */
74 void user_enable_single_step(struct task_struct *child)
76 *(unsigned short *)(child->thread.esp0 + h8300_register_offset[PT_EXR]) |= EXR_TRACE;
79 asmlinkage void trace_trap(unsigned long bp)
81 (void)bp;
82 force_sig(SIGTRAP,current);