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linux/arch/hexagon/kernel/kgdb.c
Thomas Gleixner 08dbd0f8ef treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 267 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 and
  only version 2 as published by the free software foundation this
  program is distributed in the hope that it will be useful but
  without any warranty without even the implied warranty of
  merchantability or fitness for a particular purpose see the gnu
  general public license for more details you should have received a
  copy of the gnu general public license along with this program if
  not write to the free software foundation inc 51 franklin street
  fifth floor boston ma 02110 1301 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 94 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141334.043630402@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:30:29 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* arch/hexagon/kernel/kgdb.c - Hexagon KGDB Support
*
* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
*/
#include <linux/irq.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
#include <linux/kdebug.h>
#include <linux/kgdb.h>
/* All registers are 4 bytes, for now */
#define GDB_SIZEOF_REG 4
/* The register names are used during printing of the regs;
* Keep these at three letters to pretty-print. */
struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = {
{ " r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, r00)},
{ " r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, r01)},
{ " r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, r02)},
{ " r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, r03)},
{ " r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, r04)},
{ " r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, r05)},
{ " r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, r06)},
{ " r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, r07)},
{ " r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, r08)},
{ " r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, r09)},
{ "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, r10)},
{ "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, r11)},
{ "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, r12)},
{ "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, r13)},
{ "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, r14)},
{ "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, r15)},
{ "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, r16)},
{ "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, r17)},
{ "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, r18)},
{ "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, r19)},
{ "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, r20)},
{ "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, r21)},
{ "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, r22)},
{ "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, r23)},
{ "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, r24)},
{ "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, r25)},
{ "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, r26)},
{ "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, r27)},
{ "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, r28)},
{ "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, r29)},
{ "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, r30)},
{ "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, r31)},
{ "usr", GDB_SIZEOF_REG, offsetof(struct pt_regs, usr)},
{ "preds", GDB_SIZEOF_REG, offsetof(struct pt_regs, preds)},
{ " m0", GDB_SIZEOF_REG, offsetof(struct pt_regs, m0)},
{ " m1", GDB_SIZEOF_REG, offsetof(struct pt_regs, m1)},
{ "sa0", GDB_SIZEOF_REG, offsetof(struct pt_regs, sa0)},
{ "sa1", GDB_SIZEOF_REG, offsetof(struct pt_regs, sa1)},
{ "lc0", GDB_SIZEOF_REG, offsetof(struct pt_regs, lc0)},
{ "lc1", GDB_SIZEOF_REG, offsetof(struct pt_regs, lc1)},
{ " gp", GDB_SIZEOF_REG, offsetof(struct pt_regs, gp)},
{ "ugp", GDB_SIZEOF_REG, offsetof(struct pt_regs, ugp)},
{ "cs0", GDB_SIZEOF_REG, offsetof(struct pt_regs, cs0)},
{ "cs1", GDB_SIZEOF_REG, offsetof(struct pt_regs, cs1)},
{ "psp", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmpsp)},
{ "elr", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmel)},
{ "est", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmest)},
{ "badva", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmbadva)},
{ "restart_r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, restart_r0)},
{ "syscall_nr", GDB_SIZEOF_REG, offsetof(struct pt_regs, syscall_nr)},
};
const struct kgdb_arch arch_kgdb_ops = {
/* trap0(#0xDB) 0x0cdb0054 */
.gdb_bpt_instr = {0x54, 0x00, 0xdb, 0x0c},
};
char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
{
if (regno >= DBG_MAX_REG_NUM || regno < 0)
return NULL;
*((unsigned long *) mem) = *((unsigned long *) ((void *)regs +
dbg_reg_def[regno].offset));
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;
*((unsigned long *) ((void *)regs + dbg_reg_def[regno].offset)) =
*((unsigned long *) mem);
return 0;
}
void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
{
instruction_pointer(regs) = pc;
}
/* Not yet working */
void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs,
struct task_struct *task)
{
struct pt_regs *thread_regs;
if (task == NULL)
return;
/* Initialize to zero */
memset(gdb_regs, 0, NUMREGBYTES);
/* Otherwise, we have only some registers from switch_to() */
thread_regs = task_pt_regs(task);
gdb_regs[0] = thread_regs->r00;
}
/**
* kgdb_arch_handle_exception - Handle architecture specific GDB packets.
* @vector: The error vector of the exception that happened.
* @signo: The signal number of the exception that happened.
* @err_code: The error code of the exception that happened.
* @remcom_in_buffer: The buffer of the packet we have read.
* @remcom_out_buffer: The buffer of %BUFMAX bytes to write a packet into.
* @regs: The &struct pt_regs of the current process.
*
* This function MUST handle the 'c' and 's' command packets,
* as well packets to set / remove a hardware breakpoint, if used.
* If there are additional packets which the hardware needs to handle,
* they are handled here. The code should return -1 if it wants to
* process more packets, and a %0 or %1 if it wants to exit from the
* kgdb callback.
*
* Not yet working.
*/
int kgdb_arch_handle_exception(int vector, int signo, int err_code,
char *remcom_in_buffer, char *remcom_out_buffer,
struct pt_regs *linux_regs)
{
switch (remcom_in_buffer[0]) {
case 's':
case 'c':
return 0;
}
/* Stay in the debugger. */
return -1;
}
static int __kgdb_notify(struct die_args *args, unsigned long cmd)
{
/* cpu roundup */
if (atomic_read(&kgdb_active) != -1) {
kgdb_nmicallback(smp_processor_id(), args->regs);
return NOTIFY_STOP;
}
if (user_mode(args->regs))
return NOTIFY_DONE;
if (kgdb_handle_exception(args->trapnr & 0xff, args->signr, args->err,
args->regs))
return NOTIFY_DONE;
return NOTIFY_STOP;
}
static int
kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr)
{
unsigned long flags;
int ret;
local_irq_save(flags);
ret = __kgdb_notify(ptr, cmd);
local_irq_restore(flags);
return ret;
}
static struct notifier_block kgdb_notifier = {
.notifier_call = kgdb_notify,
/*
* Lowest-prio notifier priority, we want to be notified last:
*/
.priority = -INT_MAX,
};
/**
* kgdb_arch_init - Perform any architecture specific initialization.
*
* This function will handle the initialization of any architecture
* specific callbacks.
*/
int kgdb_arch_init(void)
{
return register_die_notifier(&kgdb_notifier);
}
/**
* kgdb_arch_exit - Perform any architecture specific uninitalization.
*
* This function will handle the uninitalization of any architecture
* specific callbacks, for dynamic registration and unregistration.
*/
void kgdb_arch_exit(void)
{
unregister_die_notifier(&kgdb_notifier);
}
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