arch/hexagon/kernel/ptrace.c

Source file repositories/reference/linux-study-clean/arch/hexagon/kernel/ptrace.c

File Facts

System
Linux kernel
Corpus path
arch/hexagon/kernel/ptrace.c
Extension
.c
Size
4594 bytes
Lines
174
Domain
Architecture Layer
Bucket
arch/hexagon
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Ptrace support for Hexagon
 *
 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/regset.h>
#include <linux/user.h>
#include <linux/elf.h>

#include <asm/user.h>

#if arch_has_single_step()
/*  Both called from ptrace_resume  */
void user_enable_single_step(struct task_struct *child)
{
	pt_set_singlestep(task_pt_regs(child));
	set_tsk_thread_flag(child, TIF_SINGLESTEP);
}

void user_disable_single_step(struct task_struct *child)
{
	pt_clr_singlestep(task_pt_regs(child));
	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
}
#endif

static int genregs_get(struct task_struct *target,
		   const struct user_regset *regset,
		   struct membuf to)
{
	struct pt_regs *regs = task_pt_regs(target);

	/* The general idea here is that the copyout must happen in
	 * exactly the same order in which the userspace expects these
	 * regs. Now, the sequence in userspace does not match the
	 * sequence in the kernel, so everything past the 32 gprs
	 * happens one at a time.
	 */
	membuf_write(&to, &regs->r00, 32*sizeof(unsigned long));
	/* Must be exactly same sequence as struct user_regs_struct */
	membuf_store(&to, regs->sa0);
	membuf_store(&to, regs->lc0);
	membuf_store(&to, regs->sa1);
	membuf_store(&to, regs->lc1);
	membuf_store(&to, regs->m0);
	membuf_store(&to, regs->m1);
	membuf_store(&to, regs->usr);
	membuf_store(&to, regs->preds);
	membuf_store(&to, regs->gp);
	membuf_store(&to, regs->ugp);
	membuf_store(&to, pt_elr(regs)); // pc
	membuf_store(&to, (unsigned long)pt_cause(regs)); // cause
	membuf_store(&to, pt_badva(regs)); // badva
#if CONFIG_HEXAGON_ARCH_VERSION >=4
	membuf_store(&to, regs->cs0);
	membuf_store(&to, regs->cs1);
	return membuf_zero(&to, sizeof(unsigned long));
#else
	return membuf_zero(&to, 3 * sizeof(unsigned long));
#endif
}

static int genregs_set(struct task_struct *target,
		   const struct user_regset *regset,
		   unsigned int pos, unsigned int count,
		   const void *kbuf, const void __user *ubuf)
{
	int ret, ignore_offset;
	unsigned long bucket;
	struct pt_regs *regs = task_pt_regs(target);

	if (!regs)
		return -EIO;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 &regs->r00, 0, 32*sizeof(unsigned long));

#define INEXT(KPT_REG, USR_REG) \
	if (!ret) \
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, \
			KPT_REG, offsetof(struct user_regs_struct, USR_REG), \

Annotation

Implementation Notes