172 lines
5.1 KiB
C
172 lines
5.1 KiB
C
/*
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* Nios2 KGDB support
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*
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* Copyright (C) 2015 Altera Corporation
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* Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
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*
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* Based on the code posted by Kazuyasu on the Altera Forum at:
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* http://www.alteraforum.com/forum/showpost.php?p=77003&postcount=20
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <linux/ptrace.h>
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#include <linux/kgdb.h>
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#include <linux/kdebug.h>
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#include <linux/io.h>
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static int wait_for_remote_debugger;
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struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
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{
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{ "zero", GDB_SIZEOF_REG, -1 },
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{ "at", GDB_SIZEOF_REG, offsetof(struct pt_regs, r1) },
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{ "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, r2) },
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{ "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, r3) },
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{ "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, r4) },
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{ "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, r5) },
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{ "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, r6) },
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{ "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, r7) },
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{ "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, r8) },
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{ "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, r9) },
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{ "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, r10) },
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{ "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, r11) },
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{ "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, r12) },
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{ "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, r13) },
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{ "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, r14) },
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{ "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, r15) },
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{ "r16", GDB_SIZEOF_REG, -1 },
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{ "r17", GDB_SIZEOF_REG, -1 },
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{ "r18", GDB_SIZEOF_REG, -1 },
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{ "r19", GDB_SIZEOF_REG, -1 },
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{ "r20", GDB_SIZEOF_REG, -1 },
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{ "r21", GDB_SIZEOF_REG, -1 },
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{ "r22", GDB_SIZEOF_REG, -1 },
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{ "r23", GDB_SIZEOF_REG, -1 },
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{ "et", GDB_SIZEOF_REG, -1 },
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{ "bt", GDB_SIZEOF_REG, -1 },
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{ "gp", GDB_SIZEOF_REG, offsetof(struct pt_regs, gp) },
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{ "sp", GDB_SIZEOF_REG, offsetof(struct pt_regs, sp) },
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{ "fp", GDB_SIZEOF_REG, offsetof(struct pt_regs, fp) },
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{ "ea", GDB_SIZEOF_REG, -1 },
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{ "ba", GDB_SIZEOF_REG, -1 },
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{ "ra", GDB_SIZEOF_REG, offsetof(struct pt_regs, ra) },
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{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, ea) },
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{ "status", GDB_SIZEOF_REG, -1 },
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{ "estatus", GDB_SIZEOF_REG, offsetof(struct pt_regs, estatus) },
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{ "bstatus", GDB_SIZEOF_REG, -1 },
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{ "ienable", GDB_SIZEOF_REG, -1 },
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{ "ipending", GDB_SIZEOF_REG, -1},
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{ "cpuid", GDB_SIZEOF_REG, -1 },
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{ "ctl6", GDB_SIZEOF_REG, -1 },
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{ "exception", GDB_SIZEOF_REG, -1 },
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{ "pteaddr", GDB_SIZEOF_REG, -1 },
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{ "tlbacc", GDB_SIZEOF_REG, -1 },
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{ "tlbmisc", GDB_SIZEOF_REG, -1 },
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{ "eccinj", GDB_SIZEOF_REG, -1 },
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{ "badaddr", GDB_SIZEOF_REG, -1 },
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{ "config", GDB_SIZEOF_REG, -1 },
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{ "mpubase", GDB_SIZEOF_REG, -1 },
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{ "mpuacc", GDB_SIZEOF_REG, -1 },
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};
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char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
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{
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if (regno >= DBG_MAX_REG_NUM || regno < 0)
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return NULL;
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if (dbg_reg_def[regno].offset != -1)
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memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
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dbg_reg_def[regno].size);
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else
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memset(mem, 0, dbg_reg_def[regno].size);
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return dbg_reg_def[regno].name;
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}
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int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
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{
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if (regno >= DBG_MAX_REG_NUM || regno < 0)
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return -EINVAL;
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if (dbg_reg_def[regno].offset != -1)
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memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
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dbg_reg_def[regno].size);
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return 0;
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}
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void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
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{
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memset((char *)gdb_regs, 0, NUMREGBYTES);
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gdb_regs[GDB_SP] = p->thread.kregs->sp;
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gdb_regs[GDB_PC] = p->thread.kregs->ea;
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}
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void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
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{
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regs->ea = pc;
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}
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int kgdb_arch_handle_exception(int vector, int signo, int err_code,
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char *remcom_in_buffer, char *remcom_out_buffer,
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struct pt_regs *regs)
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{
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char *ptr;
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unsigned long addr;
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switch (remcom_in_buffer[0]) {
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case 's':
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case 'c':
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/* handle the optional parameters */
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ptr = &remcom_in_buffer[1];
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if (kgdb_hex2long(&ptr, &addr))
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regs->ea = addr;
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return 0;
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}
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return -1; /* this means that we do not want to exit from the handler */
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}
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asmlinkage void kgdb_breakpoint_c(struct pt_regs *regs)
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{
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/*
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* The breakpoint entry code has moved the PC on by 4 bytes, so we must
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* move it back. This could be done on the host but we do it here
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*/
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if (!wait_for_remote_debugger)
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regs->ea -= 4;
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else /* pass the first trap 30 code */
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wait_for_remote_debugger = 0;
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kgdb_handle_exception(30, SIGTRAP, 0, regs);
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}
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int kgdb_arch_init(void)
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{
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wait_for_remote_debugger = 1;
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return 0;
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}
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void kgdb_arch_exit(void)
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{
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/* Nothing to do */
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}
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struct kgdb_arch arch_kgdb_ops = {
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/* Breakpoint instruction: trap 30 */
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.gdb_bpt_instr = { 0xba, 0x6f, 0x3b, 0x00 },
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};
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