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nios2: add kgdb support 

Signed-off-by: Ley Foon Tan <lftan@altera.com>
This commit is contained in:
Ley Foon Tan 2015-02-16 19:26:43 +08:00
parent 08c283cc03
commit d16d2be111
5 changed files with 277 additions and 1 deletions
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1
arch/nios2/Kconfig
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@ -8,6 +8,7 @@ config NIOS2
select GENERIC_IRQ_PROBE
select GENERIC_IRQ_SHOW
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_KGDB
select IRQ_DOMAIN
select MODULES_USE_ELF_RELA
select OF

93
arch/nios2/include/asm/kgdb.h Normal file
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@ -0,0 +1,93 @@
/*
* 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/>.
*
*/
#ifndef _ASM_NIOS2_KGDB_H
#define _ASM_NIOS2_KGDB_H
#define CACHE_FLUSH_IS_SAFE 1
#define BUFMAX 2048
enum regnames {
GDB_R0 = 0,
GDB_AT,
GDB_R2,
GDB_R3,
GDB_R4,
GDB_R5,
GDB_R6,
GDB_R7,
GDB_R8,
GDB_R9,
GDB_R10,
GDB_R11,
GDB_R12,
GDB_R13,
GDB_R14,
GDB_R15,
GDB_R16,
GDB_R17,
GDB_R18,
GDB_R19,
GDB_R20,
GDB_R21,
GDB_R22,
GDB_R23,
GDB_ET,
GDB_BT,
GDB_GP,
GDB_SP,
GDB_FP,
GDB_EA,
GDB_BA,
GDB_RA,
GDB_PC,
GDB_STATUS,
GDB_ESTATUS,
GDB_BSTATUS,
GDB_IENABLE,
GDB_IPENDING,
GDB_CPUID,
GDB_CTL6,
GDB_EXCEPTION,
GDB_PTEADDR,
GDB_TLBACC,
GDB_TLBMISC,
GDB_ECCINJ,
GDB_BADADDR,
GDB_CONFIG,
GDB_MPUBASE,
GDB_MPUACC,
/* do not change the last entry or anything below! */
GDB_NUMREGBYTES /* number of registers */
};
#define GDB_SIZEOF_REG sizeof(u32)
#define DBG_MAX_REG_NUM (49)
#define NUMREGBYTES (DBG_MAX_REG_NUM * sizeof(GDB_SIZEOF_REG))
#define BREAK_INSTR_SIZE 4
static inline void arch_kgdb_breakpoint(void)
{
__asm__ __volatile__("trap 30\n");
}
#endif /* _ASM_NIOS2_KGDB_H */

1
arch/nios2/kernel/Makefile
View File

@ -21,5 +21,6 @@ obj-y += time.o
obj-y += traps.o
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_KGDB) += kgdb.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_NIOS2_ALIGNMENT_TRAP) += misaligned.o

12
arch/nios2/kernel/entry.S
View File

@ -121,7 +121,11 @@ trap_table:
.word instruction_trap /* 27 */
.word instruction_trap /* 28 */
.word instruction_trap /* 29 */
.word instruction_trap /* 30 */
#ifdef CONFIG_KGDB
.word handle_kgdb_breakpoint /* 30 KGDB breakpoint */
#else
.word instruction_trap /* 30 */
#endif
.word handle_breakpoint /* 31 */
.text
@ -445,6 +449,12 @@ handle_diverror:
call handle_diverror_c
br ret_from_exception
#ifdef CONFIG_KGDB
handle_kgdb_breakpoint:
call kgdb_breakpoint_c
br ret_from_exception
#endif
/*
* Beware - when entering resume, prev (the current task) is
* in r4, next (the new task) is in r5, don't change these

171
arch/nios2/kernel/kgdb.c Normal file
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@ -0,0 +1,171 @@
/*
* 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 },
};