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