mirror of https://gitee.com/openkylin/linux.git
172 lines
5.1 KiB
C
172 lines
5.1 KiB
C
/*
|
|
* Nios2 KGDB support
|
|
*
|
|
* Copyright (C) 2015 Altera Corporation
|
|
* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
|
|
*
|
|
* Based on the code posted by Kazuyasu on the Altera Forum at:
|
|
* http://www.alteraforum.com/forum/showpost.php?p=77003&postcount=20
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* 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, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
#include <linux/ptrace.h>
|
|
#include <linux/kgdb.h>
|
|
#include <linux/kdebug.h>
|
|
#include <linux/io.h>
|
|
|
|
static int wait_for_remote_debugger;
|
|
|
|
struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
|
|
{
|
|
{ "zero", GDB_SIZEOF_REG, -1 },
|
|
{ "at", GDB_SIZEOF_REG, offsetof(struct pt_regs, r1) },
|
|
{ "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, r2) },
|
|
{ "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, r3) },
|
|
{ "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, r4) },
|
|
{ "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, r5) },
|
|
{ "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, r6) },
|
|
{ "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, r7) },
|
|
{ "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, r8) },
|
|
{ "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, r9) },
|
|
{ "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, -1 },
|
|
{ "r17", GDB_SIZEOF_REG, -1 },
|
|
{ "r18", GDB_SIZEOF_REG, -1 },
|
|
{ "r19", GDB_SIZEOF_REG, -1 },
|
|
{ "r20", GDB_SIZEOF_REG, -1 },
|
|
{ "r21", GDB_SIZEOF_REG, -1 },
|
|
{ "r22", GDB_SIZEOF_REG, -1 },
|
|
{ "r23", GDB_SIZEOF_REG, -1 },
|
|
{ "et", GDB_SIZEOF_REG, -1 },
|
|
{ "bt", GDB_SIZEOF_REG, -1 },
|
|
{ "gp", GDB_SIZEOF_REG, offsetof(struct pt_regs, gp) },
|
|
{ "sp", GDB_SIZEOF_REG, offsetof(struct pt_regs, sp) },
|
|
{ "fp", GDB_SIZEOF_REG, offsetof(struct pt_regs, fp) },
|
|
{ "ea", GDB_SIZEOF_REG, -1 },
|
|
{ "ba", GDB_SIZEOF_REG, -1 },
|
|
{ "ra", GDB_SIZEOF_REG, offsetof(struct pt_regs, ra) },
|
|
{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, ea) },
|
|
{ "status", GDB_SIZEOF_REG, -1 },
|
|
{ "estatus", GDB_SIZEOF_REG, offsetof(struct pt_regs, estatus) },
|
|
{ "bstatus", GDB_SIZEOF_REG, -1 },
|
|
{ "ienable", GDB_SIZEOF_REG, -1 },
|
|
{ "ipending", GDB_SIZEOF_REG, -1},
|
|
{ "cpuid", GDB_SIZEOF_REG, -1 },
|
|
{ "ctl6", GDB_SIZEOF_REG, -1 },
|
|
{ "exception", GDB_SIZEOF_REG, -1 },
|
|
{ "pteaddr", GDB_SIZEOF_REG, -1 },
|
|
{ "tlbacc", GDB_SIZEOF_REG, -1 },
|
|
{ "tlbmisc", GDB_SIZEOF_REG, -1 },
|
|
{ "eccinj", GDB_SIZEOF_REG, -1 },
|
|
{ "badaddr", GDB_SIZEOF_REG, -1 },
|
|
{ "config", GDB_SIZEOF_REG, -1 },
|
|
{ "mpubase", GDB_SIZEOF_REG, -1 },
|
|
{ "mpuacc", GDB_SIZEOF_REG, -1 },
|
|
};
|
|
|
|
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 *p)
|
|
{
|
|
memset((char *)gdb_regs, 0, NUMREGBYTES);
|
|
gdb_regs[GDB_SP] = p->thread.kregs->sp;
|
|
gdb_regs[GDB_PC] = p->thread.kregs->ea;
|
|
}
|
|
|
|
void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
|
|
{
|
|
regs->ea = pc;
|
|
}
|
|
|
|
int kgdb_arch_handle_exception(int vector, int signo, int err_code,
|
|
char *remcom_in_buffer, char *remcom_out_buffer,
|
|
struct pt_regs *regs)
|
|
{
|
|
char *ptr;
|
|
unsigned long addr;
|
|
|
|
switch (remcom_in_buffer[0]) {
|
|
case 's':
|
|
case 'c':
|
|
/* handle the optional parameters */
|
|
ptr = &remcom_in_buffer[1];
|
|
if (kgdb_hex2long(&ptr, &addr))
|
|
regs->ea = addr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
return -1; /* this means that we do not want to exit from the handler */
|
|
}
|
|
|
|
asmlinkage void kgdb_breakpoint_c(struct pt_regs *regs)
|
|
{
|
|
/*
|
|
* The breakpoint entry code has moved the PC on by 4 bytes, so we must
|
|
* move it back. This could be done on the host but we do it here
|
|
*/
|
|
if (!wait_for_remote_debugger)
|
|
regs->ea -= 4;
|
|
else /* pass the first trap 30 code */
|
|
wait_for_remote_debugger = 0;
|
|
|
|
kgdb_handle_exception(30, SIGTRAP, 0, regs);
|
|
}
|
|
|
|
int kgdb_arch_init(void)
|
|
{
|
|
wait_for_remote_debugger = 1;
|
|
return 0;
|
|
}
|
|
|
|
void kgdb_arch_exit(void)
|
|
{
|
|
/* Nothing to do */
|
|
}
|
|
|
|
struct kgdb_arch arch_kgdb_ops = {
|
|
/* Breakpoint instruction: trap 30 */
|
|
.gdb_bpt_instr = { 0xba, 0x6f, 0x3b, 0x00 },
|
|
};
|