2008-04-17 12:05:37 -06:00
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/*
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* This provides the callbacks and functions that KGDB needs to share between
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* the core, I/O and arch-specific portions.
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*
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* Author: Amit Kale <amitkale@linsyssoft.com> and
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* Tom Rini <trini@kernel.crashing.org>
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*
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* 2001-2004 (c) Amit S. Kale and 2003-2005 (c) MontaVista Software, Inc.
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#ifndef _KGDB_H_
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#define _KGDB_H_
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#include <linux/linkage.h>
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#include <linux/init.h>
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2011-07-26 17:09:06 -06:00
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#include <linux/atomic.h>
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2010-05-20 20:04:21 -06:00
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#ifdef CONFIG_HAVE_ARCH_KGDB
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2008-04-17 12:05:37 -06:00
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#include <asm/kgdb.h>
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2010-05-20 20:04:21 -06:00
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#endif
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2008-04-17 12:05:37 -06:00
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2010-05-20 20:04:21 -06:00
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#ifdef CONFIG_KGDB
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2008-04-17 12:05:37 -06:00
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struct pt_regs;
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2008-03-20 12:43:45 -06:00
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/**
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* kgdb_skipexception - (optional) exit kgdb_handle_exception early
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2008-04-17 12:05:37 -06:00
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* @exception: Exception vector number
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* @regs: Current &struct pt_regs.
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*
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2008-03-20 12:43:45 -06:00
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* On some architectures it is required to skip a breakpoint
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* exception when it occurs after a breakpoint has been removed.
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2010-01-07 10:58:37 -07:00
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* This can be implemented in the architecture specific portion of kgdb.
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2008-04-17 12:05:37 -06:00
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*/
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extern int kgdb_skipexception(int exception, struct pt_regs *regs);
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struct tasklet_struct;
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struct task_struct;
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struct uart_port;
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2008-03-20 12:43:45 -06:00
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/**
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* kgdb_breakpoint - compiled in breakpoint
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*
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2010-01-07 10:58:37 -07:00
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* This will be implemented as a static inline per architecture. This
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2008-03-20 12:43:45 -06:00
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* function is called by the kgdb core to execute an architecture
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* specific trap to cause kgdb to enter the exception processing.
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*
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*/
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2008-04-17 12:05:37 -06:00
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void kgdb_breakpoint(void);
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extern int kgdb_connected;
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2010-05-20 20:04:25 -06:00
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extern int kgdb_io_module_registered;
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2008-04-17 12:05:37 -06:00
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extern atomic_t kgdb_setting_breakpoint;
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extern atomic_t kgdb_cpu_doing_single_step;
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extern struct task_struct *kgdb_usethread;
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extern struct task_struct *kgdb_contthread;
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enum kgdb_bptype {
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BP_BREAKPOINT = 0,
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BP_HARDWARE_BREAKPOINT,
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BP_WRITE_WATCHPOINT,
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BP_READ_WATCHPOINT,
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2012-03-23 08:35:05 -06:00
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BP_ACCESS_WATCHPOINT,
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BP_POKE_BREAKPOINT,
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2008-04-17 12:05:37 -06:00
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};
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enum kgdb_bpstate {
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BP_UNDEFINED = 0,
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BP_REMOVED,
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BP_SET,
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BP_ACTIVE
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};
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struct kgdb_bkpt {
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unsigned long bpt_addr;
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unsigned char saved_instr[BREAK_INSTR_SIZE];
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enum kgdb_bptype type;
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enum kgdb_bpstate state;
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};
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2010-08-05 08:22:20 -06:00
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struct dbg_reg_def_t {
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char *name;
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int size;
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int offset;
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};
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#ifndef DBG_MAX_REG_NUM
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#define DBG_MAX_REG_NUM 0
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#else
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extern struct dbg_reg_def_t dbg_reg_def[];
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extern char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs);
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extern int dbg_set_reg(int regno, void *mem, struct pt_regs *regs);
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#endif
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2008-04-17 12:05:37 -06:00
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#ifndef KGDB_MAX_BREAKPOINTS
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# define KGDB_MAX_BREAKPOINTS 1000
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#endif
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#define KGDB_HW_BREAKPOINT 1
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/*
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* Functions each KGDB-supporting architecture must provide:
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*/
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2008-03-20 12:43:45 -06:00
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/**
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2008-04-17 12:05:37 -06:00
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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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extern int kgdb_arch_init(void);
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2008-03-20 12:43:45 -06:00
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/**
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2008-04-17 12:05:37 -06:00
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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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extern void kgdb_arch_exit(void);
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2008-03-20 12:43:45 -06:00
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/**
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2008-04-17 12:05:37 -06:00
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* pt_regs_to_gdb_regs - Convert ptrace regs to GDB regs
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* @gdb_regs: A pointer to hold the registers in the order GDB wants.
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* @regs: The &struct pt_regs of the current process.
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*
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* Convert the pt_regs in @regs into the format for registers that
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* GDB expects, stored in @gdb_regs.
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*/
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extern void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs);
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2008-03-20 12:43:45 -06:00
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/**
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2008-04-17 12:05:37 -06:00
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* sleeping_thread_to_gdb_regs - Convert ptrace regs to GDB regs
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* @gdb_regs: A pointer to hold the registers in the order GDB wants.
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* @p: The &struct task_struct of the desired process.
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*
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* Convert the register values of the sleeping process in @p to
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* the format that GDB expects.
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* This function is called when kgdb does not have access to the
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* &struct pt_regs and therefore it should fill the gdb registers
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* @gdb_regs with what has been saved in &struct thread_struct
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* thread field during switch_to.
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*/
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extern void
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sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p);
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2008-03-20 12:43:45 -06:00
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/**
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2008-04-17 12:05:37 -06:00
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* gdb_regs_to_pt_regs - Convert GDB regs to ptrace regs.
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* @gdb_regs: A pointer to hold the registers we've received from GDB.
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* @regs: A pointer to a &struct pt_regs to hold these values in.
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*
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* Convert the GDB regs in @gdb_regs into the pt_regs, and store them
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* in @regs.
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*/
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extern void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs);
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2008-03-20 12:43:45 -06:00
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/**
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2008-04-17 12:05:37 -06:00
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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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extern int
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kgdb_arch_handle_exception(int vector, int signo, int err_code,
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char *remcom_in_buffer,
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char *remcom_out_buffer,
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struct pt_regs *regs);
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2008-03-20 12:43:45 -06:00
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/**
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2008-04-17 12:05:37 -06:00
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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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2010-01-07 10:58:37 -07:00
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* and get them into a known state. This should do what is needed
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2008-04-17 12:05:37 -06:00
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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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extern void kgdb_roundup_cpus(unsigned long flags);
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2010-05-20 20:04:24 -06:00
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/**
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* kgdb_arch_set_pc - Generic call back to the program counter
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* @regs: Current &struct pt_regs.
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* @pc: The new value for the program counter
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*
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* This function handles updating the program counter and requires an
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* architecture specific implementation.
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*/
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extern void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc);
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2008-04-17 12:05:37 -06:00
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/* Optional functions. */
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extern int kgdb_validate_break_address(unsigned long addr);
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2012-03-21 09:17:03 -06:00
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extern int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt);
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extern int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt);
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2008-04-17 12:05:37 -06:00
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2010-05-20 20:04:29 -06:00
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/**
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* kgdb_arch_late - Perform any architecture specific initalization.
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*
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* This function will handle the late initalization of any
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* architecture specific callbacks. This is an optional function for
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* handling things like late initialization of hw breakpoints. The
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* default implementation does nothing.
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*/
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extern void kgdb_arch_late(void);
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2008-03-20 12:43:45 -06:00
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/**
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2008-04-17 12:05:37 -06:00
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* struct kgdb_arch - Describe architecture specific values.
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* @gdb_bpt_instr: The instruction to trigger a breakpoint.
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* @flags: Flags for the breakpoint, currently just %KGDB_HW_BREAKPOINT.
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* @set_breakpoint: Allow an architecture to specify how to set a software
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* breakpoint.
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* @remove_breakpoint: Allow an architecture to specify how to remove a
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* software breakpoint.
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* @set_hw_breakpoint: Allow an architecture to specify how to set a hardware
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* breakpoint.
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* @remove_hw_breakpoint: Allow an architecture to specify how to remove a
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* hardware breakpoint.
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2010-08-18 05:02:00 -06:00
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* @disable_hw_break: Allow an architecture to specify how to disable
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* hardware breakpoints for a single cpu.
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2008-04-17 12:05:37 -06:00
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* @remove_all_hw_break: Allow an architecture to specify how to remove all
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* hardware breakpoints.
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* @correct_hw_break: Allow an architecture to specify how to correct the
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* hardware debug registers.
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2012-09-24 15:27:50 -06:00
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* @enable_nmi: Manage NMI-triggered entry to KGDB
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2008-04-17 12:05:37 -06:00
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*/
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struct kgdb_arch {
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unsigned char gdb_bpt_instr[BREAK_INSTR_SIZE];
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unsigned long flags;
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int (*set_breakpoint)(unsigned long, char *);
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int (*remove_breakpoint)(unsigned long, char *);
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int (*set_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);
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int (*remove_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);
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2010-08-18 05:02:00 -06:00
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void (*disable_hw_break)(struct pt_regs *regs);
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2008-04-17 12:05:37 -06:00
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void (*remove_all_hw_break)(void);
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void (*correct_hw_break)(void);
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2012-09-24 15:27:50 -06:00
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void (*enable_nmi)(bool on);
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2008-04-17 12:05:37 -06:00
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};
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2008-03-20 12:43:45 -06:00
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/**
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2008-04-17 12:05:37 -06:00
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* struct kgdb_io - Describe the interface for an I/O driver to talk with KGDB.
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* @name: Name of the I/O driver.
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* @read_char: Pointer to a function that will return one char.
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* @write_char: Pointer to a function that will write one char.
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* @flush: Pointer to a function that will flush any pending writes.
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* @init: Pointer to a function that will initialize the device.
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* @pre_exception: Pointer to a function that will do any prep work for
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* the I/O driver.
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* @post_exception: Pointer to a function that will do any cleanup work
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* for the I/O driver.
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2010-05-20 20:04:26 -06:00
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* @is_console: 1 if the end device is a console 0 if the I/O device is
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* not a console
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2008-04-17 12:05:37 -06:00
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*/
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struct kgdb_io {
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const char *name;
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int (*read_char) (void);
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void (*write_char) (u8);
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void (*flush) (void);
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int (*init) (void);
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void (*pre_exception) (void);
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void (*post_exception) (void);
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2010-05-20 20:04:26 -06:00
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int is_console;
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2008-04-17 12:05:37 -06:00
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};
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extern struct kgdb_arch arch_kgdb_ops;
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2008-04-24 15:57:23 -06:00
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extern unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs);
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tty/serial: Add kgdb_nmi driver
This special driver makes it possible to temporary use NMI debugger port
as a normal console by issuing 'nmi_console' command (assuming that the
port is attached to KGDB).
Unlike KDB's disable_nmi command, with this driver you are always able
to go back to the debugger using KGDB escape sequence ($3#33). This is
because this console driver processes the input in NMI context, and thus
is able to intercept the magic sequence.
Note that since the console interprets input and uses polling
communication methods, for things like PPP it is still better to fully
detach debugger port from the KGDB NMI (i.e. disable_nmi), and use raw
console.
Usually, to enter the debugger one have to type the magic sequence, so
initially the kernel will print the following prompt on the NMI debugger
console:
Type $3#33 to enter the debugger>
For convenience, there is a kgdb_fiq.knock kernel command line option,
when set to 0, this turns the special command to just a return key
press, so the kernel will be printing this:
Hit <return> to enter the debugger>
This is more convenient for long debugging sessions, although it makes
nmi_console feature somewhat useless.
And for the cases when NMI connected to a dedicated button, the knocking
can be disabled altogether by setting kgdb_fiq.knock to -1.
Suggested-by: Colin Cross <ccross@android.com>
Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Alan Cox <alan@linux.intel.com>
Acked-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-09-24 15:27:56 -06:00
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#ifdef CONFIG_SERIAL_KGDB_NMI
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extern int kgdb_register_nmi_console(void);
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extern int kgdb_unregister_nmi_console(void);
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extern bool kgdb_nmi_poll_knock(void);
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#else
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static inline int kgdb_register_nmi_console(void) { return 0; }
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static inline int kgdb_unregister_nmi_console(void) { return 0; }
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static inline bool kgdb_nmi_poll_knock(void) { return 1; }
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#endif
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2008-04-17 12:05:37 -06:00
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extern int kgdb_register_io_module(struct kgdb_io *local_kgdb_io_ops);
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extern void kgdb_unregister_io_module(struct kgdb_io *local_kgdb_io_ops);
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2010-04-02 10:48:03 -06:00
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extern struct kgdb_io *dbg_io_ops;
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2008-04-17 12:05:37 -06:00
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2008-04-24 15:57:23 -06:00
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extern int kgdb_hex2long(char **ptr, unsigned long *long_val);
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2010-08-05 08:22:21 -06:00
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extern char *kgdb_mem2hex(char *mem, char *buf, int count);
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2008-04-17 12:05:37 -06:00
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extern int kgdb_hex2mem(char *buf, char *mem, int count);
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extern int kgdb_isremovedbreak(unsigned long addr);
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2009-06-03 13:06:57 -06:00
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extern void kgdb_schedule_breakpoint(void);
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2008-04-17 12:05:37 -06:00
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extern int
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kgdb_handle_exception(int ex_vector, int signo, int err_code,
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struct pt_regs *regs);
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extern int kgdb_nmicallback(int cpu, void *regs);
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2014-01-14 09:25:52 -07:00
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extern int kgdb_nmicallin(int cpu, int trapnr, void *regs, int err_code,
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atomic_t *snd_rdy);
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2011-03-18 10:54:31 -06:00
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extern void gdbstub_exit(int status);
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2008-04-17 12:05:37 -06:00
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extern int kgdb_single_step;
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extern atomic_t kgdb_active;
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2010-05-20 20:04:21 -06:00
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#define in_dbg_master() \
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(raw_smp_processor_id() == atomic_read(&kgdb_active))
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2010-05-20 20:04:29 -06:00
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extern bool dbg_is_early;
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extern void __init dbg_late_init(void);
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2010-05-20 20:04:21 -06:00
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#else /* ! CONFIG_KGDB */
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#define in_dbg_master() (0)
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2010-05-20 20:04:29 -06:00
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#define dbg_late_init()
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2010-05-20 20:04:21 -06:00
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#endif /* ! CONFIG_KGDB */
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2008-04-17 12:05:37 -06:00
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#endif /* _KGDB_H_ */
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