arch/arm/kernel/kgdb.c

Source file repositories/reference/linux-study-clean/arch/arm/kernel/kgdb.c

File Facts

System
Linux kernel
Corpus path
arch/arm/kernel/kgdb.c
Extension
.c
Size
7416 bytes
Lines
292
Domain
Architecture Layer
Bucket
arch/arm
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
/*
 * arch/arm/kernel/kgdb.c
 *
 * ARM KGDB support
 *
 * Copyright (c) 2002-2004 MontaVista Software, Inc
 * Copyright (c) 2008 Wind River Systems, Inc.
 *
 * Authors:  George Davis <davis_g@mvista.com>
 *           Deepak Saxena <dsaxena@plexity.net>
 */
#include <linux/irq.h>
#include <linux/kdebug.h>
#include <linux/kgdb.h>
#include <linux/uaccess.h>

#include <asm/text-patching.h>
#include <asm/traps.h>

struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
{
	{ "r0", 4, offsetof(struct pt_regs, ARM_r0)},
	{ "r1", 4, offsetof(struct pt_regs, ARM_r1)},
	{ "r2", 4, offsetof(struct pt_regs, ARM_r2)},
	{ "r3", 4, offsetof(struct pt_regs, ARM_r3)},
	{ "r4", 4, offsetof(struct pt_regs, ARM_r4)},
	{ "r5", 4, offsetof(struct pt_regs, ARM_r5)},
	{ "r6", 4, offsetof(struct pt_regs, ARM_r6)},
	{ "r7", 4, offsetof(struct pt_regs, ARM_r7)},
	{ "r8", 4, offsetof(struct pt_regs, ARM_r8)},
	{ "r9", 4, offsetof(struct pt_regs, ARM_r9)},
	{ "r10", 4, offsetof(struct pt_regs, ARM_r10)},
	{ "fp", 4, offsetof(struct pt_regs, ARM_fp)},
	{ "ip", 4, offsetof(struct pt_regs, ARM_ip)},
	{ "sp", 4, offsetof(struct pt_regs, ARM_sp)},
	{ "lr", 4, offsetof(struct pt_regs, ARM_lr)},
	{ "pc", 4, offsetof(struct pt_regs, ARM_pc)},
	{ "f0", 12, -1 },
	{ "f1", 12, -1 },
	{ "f2", 12, -1 },
	{ "f3", 12, -1 },
	{ "f4", 12, -1 },
	{ "f5", 12, -1 },
	{ "f6", 12, -1 },
	{ "f7", 12, -1 },
	{ "fps", 4, -1 },
	{ "cpsr", 4, offsetof(struct pt_regs, ARM_cpsr)},
};

char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
{
	if (regno >= DBG_MAX_REG_NUM || regno < 0)
		return NULL;

	if (dbg_reg_def[regno].offset != -1)
		memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
		       dbg_reg_def[regno].size);
	else
		memset(mem, 0, dbg_reg_def[regno].size);
	return dbg_reg_def[regno].name;
}

int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
{
	if (regno >= DBG_MAX_REG_NUM || regno < 0)
		return -EINVAL;

	if (dbg_reg_def[regno].offset != -1)
		memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
		       dbg_reg_def[regno].size);
	return 0;
}

void
sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *task)
{
	struct thread_info *ti;
	int regno;

	/* Just making sure... */
	if (task == NULL)
		return;

	/* Initialize to zero */
	for (regno = 0; regno < GDB_MAX_REGS; regno++)
		gdb_regs[regno] = 0;

	/* Otherwise, we have only some registers from switch_to() */
	ti			= task_thread_info(task);

Annotation

Implementation Notes