259 lines
8.5 KiB
C
259 lines
8.5 KiB
C
/*
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* arch/hexagon/kernel/kgdb.c - Hexagon KGDB Support
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*
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* Copyright (c) 2011-2012, The Linux Foundation. All rights reserved.
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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 version 2 and
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* only version 2 as published by the Free Software Foundation.
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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#include <linux/irq.h>
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#include <linux/sched.h>
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#include <linux/kdebug.h>
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#include <linux/kgdb.h>
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/* All registers are 4 bytes, for now */
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#define GDB_SIZEOF_REG 4
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/* The register names are used during printing of the regs;
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* Keep these at three letters to pretty-print. */
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struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = {
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{ " r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, r00)},
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{ " r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, r01)},
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{ " r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, r02)},
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{ " r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, r03)},
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{ " r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, r04)},
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{ " r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, r05)},
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{ " r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, r06)},
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{ " r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, r07)},
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{ " r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, r08)},
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{ " r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, r09)},
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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, offsetof(struct pt_regs, r16)},
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{ "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, r17)},
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{ "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, r18)},
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{ "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, r19)},
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{ "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, r20)},
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{ "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, r21)},
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{ "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, r22)},
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{ "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, r23)},
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{ "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, r24)},
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{ "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, r25)},
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{ "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, r26)},
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{ "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, r27)},
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{ "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, r28)},
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{ "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, r29)},
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{ "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, r30)},
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{ "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, r31)},
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{ "usr", GDB_SIZEOF_REG, offsetof(struct pt_regs, usr)},
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{ "preds", GDB_SIZEOF_REG, offsetof(struct pt_regs, preds)},
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{ " m0", GDB_SIZEOF_REG, offsetof(struct pt_regs, m0)},
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{ " m1", GDB_SIZEOF_REG, offsetof(struct pt_regs, m1)},
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{ "sa0", GDB_SIZEOF_REG, offsetof(struct pt_regs, sa0)},
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{ "sa1", GDB_SIZEOF_REG, offsetof(struct pt_regs, sa1)},
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{ "lc0", GDB_SIZEOF_REG, offsetof(struct pt_regs, lc0)},
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{ "lc1", GDB_SIZEOF_REG, offsetof(struct pt_regs, lc1)},
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{ " gp", GDB_SIZEOF_REG, offsetof(struct pt_regs, gp)},
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{ "ugp", GDB_SIZEOF_REG, offsetof(struct pt_regs, ugp)},
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{ "cs0", GDB_SIZEOF_REG, offsetof(struct pt_regs, cs0)},
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{ "cs1", GDB_SIZEOF_REG, offsetof(struct pt_regs, cs1)},
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{ "psp", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmpsp)},
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{ "elr", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmel)},
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{ "est", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmest)},
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{ "badva", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmbadva)},
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{ "restart_r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, restart_r0)},
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{ "syscall_nr", GDB_SIZEOF_REG, offsetof(struct pt_regs, syscall_nr)},
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};
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struct kgdb_arch arch_kgdb_ops = {
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/* trap0(#0xDB) 0x0cdb0054 */
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.gdb_bpt_instr = {0x54, 0x00, 0xdb, 0x0c},
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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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*((unsigned long *) mem) = *((unsigned long *) ((void *)regs +
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dbg_reg_def[regno].offset));
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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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*((unsigned long *) ((void *)regs + dbg_reg_def[regno].offset)) =
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*((unsigned long *) mem);
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return 0;
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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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instruction_pointer(regs) = pc;
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}
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#ifdef CONFIG_SMP
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/**
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* kgdb_roundup_cpus - Get other CPUs into a holding pattern
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* @flags: Current IRQ state
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*
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* On SMP systems, we need to get the attention of the other CPUs
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* and get them be in a known state. This should do what is needed
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* to get the other CPUs to call kgdb_wait(). Note that on some arches,
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* the NMI approach is not used for rounding up all the CPUs. For example,
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* in case of MIPS, smp_call_function() is used to roundup CPUs. In
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* this case, we have to make sure that interrupts are enabled before
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* calling smp_call_function(). The argument to this function is
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* the flags that will be used when restoring the interrupts. There is
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* local_irq_save() call before kgdb_roundup_cpus().
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*
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* On non-SMP systems, this is not called.
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*/
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static void hexagon_kgdb_nmi_hook(void *ignored)
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{
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kgdb_nmicallback(raw_smp_processor_id(), get_irq_regs());
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}
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void kgdb_roundup_cpus(unsigned long flags)
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{
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local_irq_enable();
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smp_call_function(hexagon_kgdb_nmi_hook, NULL, 0);
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local_irq_disable();
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}
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#endif
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/* Not yet working */
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void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs,
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struct task_struct *task)
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{
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struct pt_regs *thread_regs;
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if (task == NULL)
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return;
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/* Initialize to zero */
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memset(gdb_regs, 0, NUMREGBYTES);
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/* Otherwise, we have only some registers from switch_to() */
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thread_regs = task_pt_regs(task);
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gdb_regs[0] = thread_regs->r00;
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}
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/**
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* kgdb_arch_handle_exception - Handle architecture specific GDB packets.
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* @vector: The error vector of the exception that happened.
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* @signo: The signal number of the exception that happened.
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* @err_code: The error code of the exception that happened.
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* @remcom_in_buffer: The buffer of the packet we have read.
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* @remcom_out_buffer: The buffer of %BUFMAX bytes to write a packet into.
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* @regs: The &struct pt_regs of the current process.
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*
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* This function MUST handle the 'c' and 's' command packets,
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* as well packets to set / remove a hardware breakpoint, if used.
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* If there are additional packets which the hardware needs to handle,
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* they are handled here. The code should return -1 if it wants to
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* process more packets, and a %0 or %1 if it wants to exit from the
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* kgdb callback.
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*
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* Not yet working.
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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 *linux_regs)
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{
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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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return 0;
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}
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/* Stay in the debugger. */
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return -1;
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}
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static int __kgdb_notify(struct die_args *args, unsigned long cmd)
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{
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/* cpu roundup */
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if (atomic_read(&kgdb_active) != -1) {
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kgdb_nmicallback(smp_processor_id(), args->regs);
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return NOTIFY_STOP;
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}
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if (user_mode(args->regs))
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return NOTIFY_DONE;
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if (kgdb_handle_exception(args->trapnr & 0xff, args->signr, args->err,
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args->regs))
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return NOTIFY_DONE;
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return NOTIFY_STOP;
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}
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static int
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kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr)
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{
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unsigned long flags;
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int ret;
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local_irq_save(flags);
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ret = __kgdb_notify(ptr, cmd);
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local_irq_restore(flags);
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return ret;
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}
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static struct notifier_block kgdb_notifier = {
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.notifier_call = kgdb_notify,
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/*
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* Lowest-prio notifier priority, we want to be notified last:
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*/
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.priority = -INT_MAX,
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};
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/**
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* kgdb_arch_init - Perform any architecture specific initalization.
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*
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* This function will handle the initalization of any architecture
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* specific callbacks.
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*/
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int kgdb_arch_init(void)
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{
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return register_die_notifier(&kgdb_notifier);
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}
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/**
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* kgdb_arch_exit - Perform any architecture specific uninitalization.
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*
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* This function will handle the uninitalization of any architecture
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* specific callbacks, for dynamic registration and unregistration.
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*/
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void kgdb_arch_exit(void)
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{
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unregister_die_notifier(&kgdb_notifier);
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}
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