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/*
* linux/arch/h8300/platform/h8s/ptrace_h8s.c
* ptrace cpu depend helper functions
*
* Yoshinori Sato <ysato@users.sourceforge.jp>
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of
* this archive for more details.
*/
#include <linux/linkage.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <asm/ptrace.h>
#define CCR_MASK 0x6f
#define EXR_TRACE 0x80
/* Mapping from PT_xxx to the stack offset at which the register is
saved. Notice that usp has no stack-slot and needs to be treated
specially (see get_reg/put_reg below). */
static const int h8300_register_offset[] = {
PT_REG(er1), PT_REG(er2), PT_REG(er3), PT_REG(er4),
PT_REG(er5), PT_REG(er6), PT_REG(er0), PT_REG(orig_er0),
PT_REG(ccr), PT_REG(pc), 0, PT_REG(exr)
};
/* read register */
long h8300_get_reg(struct task_struct *task, int regno)
{
switch (regno) {
case PT_USP:
return task->thread.usp + sizeof(long)*2 + 2;
case PT_CCR:
case PT_EXR:
return *(unsigned short *)(task->thread.esp0 + h8300_register_offset[regno]);
default:
return *(unsigned long *)(task->thread.esp0 + h8300_register_offset[regno]);
}
}
/* write register */
int h8300_put_reg(struct task_struct *task, int regno, unsigned long data)
{
unsigned short oldccr;
switch (regno) {
case PT_USP:
task->thread.usp = data - sizeof(long)*2 - 2;
case PT_CCR:
oldccr = *(unsigned short *)(task->thread.esp0 + h8300_register_offset[regno]);
oldccr &= ~CCR_MASK;
data &= CCR_MASK;
data |= oldccr;
*(unsigned short *)(task->thread.esp0 + h8300_register_offset[regno]) = data;
break;
case PT_EXR:
/* exr modify not support */
return -EIO;
default:
*(unsigned long *)(task->thread.esp0 + h8300_register_offset[regno]) = data;
break;
}
return 0;
}
/* disable singlestep */
void user_disable_single_step(struct task_struct *child)
{
*(unsigned short *)(child->thread.esp0 + h8300_register_offset[PT_EXR]) &= ~EXR_TRACE;
}
/* enable singlestep */
void user_enable_single_step(struct task_struct *child)
{
*(unsigned short *)(child->thread.esp0 + h8300_register_offset[PT_EXR]) |= EXR_TRACE;
}
asmlinkage void trace_trap(unsigned long bp)
{
(void)bp;
force_sig(SIGTRAP,current);
}
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