284 lines
9.3 KiB
C
284 lines
9.3 KiB
C
|
/*
|
||
|
|
* This provides the callbacks and functions that KGDB needs to share between
|
||
|
|
* the core, I/O and arch-specific portions.
|
||
|
|
*
|
||
|
|
* Author: Amit Kale <amitkale@linsyssoft.com> and
|
||
|
|
* Tom Rini <trini@kernel.crashing.org>
|
||
|
|
*
|
||
|
|
* 2001-2004 (c) Amit S. Kale and 2003-2005 (c) MontaVista Software, Inc.
|
||
|
|
* This file is licensed under the terms of the GNU General Public License
|
||
|
|
* version 2. This program is licensed "as is" without any warranty of any
|
||
|
|
* kind, whether express or implied.
|
||
|
|
*/
|
||
|
|
#ifndef _KGDB_H_
|
||
|
|
#define _KGDB_H_
|
||
|
|
|
||
|
|
#include <linux/serial_8250.h>
|
||
|
|
#include <linux/linkage.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
|
||
|
|
#include <asm/atomic.h>
|
||
|
|
#include <asm/kgdb.h>
|
||
|
|
|
||
|
|
struct pt_regs;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* kgdb_skipexception - (optional) exit kgdb_handle_exception early
|
||
|
|
* @exception: Exception vector number
|
||
|
|
* @regs: Current &struct pt_regs.
|
||
|
|
*
|
||
|
|
* On some architectures it is required to skip a breakpoint
|
||
|
|
* exception when it occurs after a breakpoint has been removed.
|
||
|
|
* This can be implemented in the architecture specific portion of
|
||
|
|
* for kgdb.
|
||
|
|
*/
|
||
|
|
extern int kgdb_skipexception(int exception, struct pt_regs *regs);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* kgdb_post_primary_code - (optional) Save error vector/code numbers.
|
||
|
|
* @regs: Original pt_regs.
|
||
|
|
* @e_vector: Original error vector.
|
||
|
|
* @err_code: Original error code.
|
||
|
|
*
|
||
|
|
* This is usually needed on architectures which support SMP and
|
||
|
|
* KGDB. This function is called after all the secondary cpus have
|
||
|
|
* been put to a know spin state and the primary CPU has control over
|
||
|
|
* KGDB.
|
||
|
|
*/
|
||
|
|
extern void kgdb_post_primary_code(struct pt_regs *regs, int e_vector,
|
||
|
|
int err_code);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* kgdb_disable_hw_debug - (optional) Disable hardware debugging hook
|
||
|
|
* @regs: Current &struct pt_regs.
|
||
|
|
*
|
||
|
|
* This function will be called if the particular architecture must
|
||
|
|
* disable hardware debugging while it is processing gdb packets or
|
||
|
|
* handling exception.
|
||
|
|
*/
|
||
|
|
extern void kgdb_disable_hw_debug(struct pt_regs *regs);
|
||
|
|
|
||
|
|
struct tasklet_struct;
|
||
|
|
struct task_struct;
|
||
|
|
struct uart_port;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* kgdb_breakpoint - compiled in breakpoint
|
||
|
|
*
|
||
|
|
* This will be impelmented a static inline per architecture. This
|
||
|
|
* function is called by the kgdb core to execute an architecture
|
||
|
|
* specific trap to cause kgdb to enter the exception processing.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
void kgdb_breakpoint(void);
|
||
|
|
|
||
|
|
extern int kgdb_connected;
|
||
|
|
|
||
|
|
extern atomic_t kgdb_setting_breakpoint;
|
||
|
|
extern atomic_t kgdb_cpu_doing_single_step;
|
||
|
|
|
||
|
|
extern struct task_struct *kgdb_usethread;
|
||
|
|
extern struct task_struct *kgdb_contthread;
|
||
|
|
|
||
|
|
enum kgdb_bptype {
|
||
|
|
BP_BREAKPOINT = 0,
|
||
|
|
BP_HARDWARE_BREAKPOINT,
|
||
|
|
BP_WRITE_WATCHPOINT,
|
||
|
|
BP_READ_WATCHPOINT,
|
||
|
|
BP_ACCESS_WATCHPOINT
|
||
|
|
};
|
||
|
|
|
||
|
|
enum kgdb_bpstate {
|
||
|
|
BP_UNDEFINED = 0,
|
||
|
|
BP_REMOVED,
|
||
|
|
BP_SET,
|
||
|
|
BP_ACTIVE
|
||
|
|
};
|
||
|
|
|
||
|
|
struct kgdb_bkpt {
|
||
|
|
unsigned long bpt_addr;
|
||
|
|
unsigned char saved_instr[BREAK_INSTR_SIZE];
|
||
|
|
enum kgdb_bptype type;
|
||
|
|
enum kgdb_bpstate state;
|
||
|
|
};
|
||
|
|
|
||
|
|
#ifndef KGDB_MAX_BREAKPOINTS
|
||
|
|
# define KGDB_MAX_BREAKPOINTS 1000
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define KGDB_HW_BREAKPOINT 1
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Functions each KGDB-supporting architecture must provide:
|
||
|
|
*/
|
||
|
|
|
||
|
|
/**
|
||
|
|
* kgdb_arch_init - Perform any architecture specific initalization.
|
||
|
|
*
|
||
|
|
* This function will handle the initalization of any architecture
|
||
|
|
* specific callbacks.
|
||
|
|
*/
|
||
|
|
extern int kgdb_arch_init(void);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* kgdb_arch_exit - Perform any architecture specific uninitalization.
|
||
|
|
*
|
||
|
|
* This function will handle the uninitalization of any architecture
|
||
|
|
* specific callbacks, for dynamic registration and unregistration.
|
||
|
|
*/
|
||
|
|
extern void kgdb_arch_exit(void);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* pt_regs_to_gdb_regs - Convert ptrace regs to GDB regs
|
||
|
|
* @gdb_regs: A pointer to hold the registers in the order GDB wants.
|
||
|
|
* @regs: The &struct pt_regs of the current process.
|
||
|
|
*
|
||
|
|
* Convert the pt_regs in @regs into the format for registers that
|
||
|
|
* GDB expects, stored in @gdb_regs.
|
||
|
|
*/
|
||
|
|
extern void pt_regs_to_gdb_regs(unsigned long *gdb_regs, struct pt_regs *regs);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* sleeping_thread_to_gdb_regs - Convert ptrace regs to GDB regs
|
||
|
|
* @gdb_regs: A pointer to hold the registers in the order GDB wants.
|
||
|
|
* @p: The &struct task_struct of the desired process.
|
||
|
|
*
|
||
|
|
* Convert the register values of the sleeping process in @p to
|
||
|
|
* the format that GDB expects.
|
||
|
|
* This function is called when kgdb does not have access to the
|
||
|
|
* &struct pt_regs and therefore it should fill the gdb registers
|
||
|
|
* @gdb_regs with what has been saved in &struct thread_struct
|
||
|
|
* thread field during switch_to.
|
||
|
|
*/
|
||
|
|
extern void
|
||
|
|
sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* gdb_regs_to_pt_regs - Convert GDB regs to ptrace regs.
|
||
|
|
* @gdb_regs: A pointer to hold the registers we've received from GDB.
|
||
|
|
* @regs: A pointer to a &struct pt_regs to hold these values in.
|
||
|
|
*
|
||
|
|
* Convert the GDB regs in @gdb_regs into the pt_regs, and store them
|
||
|
|
* in @regs.
|
||
|
|
*/
|
||
|
|
extern void gdb_regs_to_pt_regs(unsigned long *gdb_regs, struct pt_regs *regs);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* kgdb_arch_handle_exception - Handle architecture specific GDB packets.
|
||
|
|
* @vector: The error vector of the exception that happened.
|
||
|
|
* @signo: The signal number of the exception that happened.
|
||
|
|
* @err_code: The error code of the exception that happened.
|
||
|
|
* @remcom_in_buffer: The buffer of the packet we have read.
|
||
|
|
* @remcom_out_buffer: The buffer of %BUFMAX bytes to write a packet into.
|
||
|
|
* @regs: The &struct pt_regs of the current process.
|
||
|
|
*
|
||
|
|
* This function MUST handle the 'c' and 's' command packets,
|
||
|
|
* as well packets to set / remove a hardware breakpoint, if used.
|
||
|
|
* If there are additional packets which the hardware needs to handle,
|
||
|
|
* they are handled here. The code should return -1 if it wants to
|
||
|
|
* process more packets, and a %0 or %1 if it wants to exit from the
|
||
|
|
* kgdb callback.
|
||
|
|
*/
|
||
|
|
extern int
|
||
|
|
kgdb_arch_handle_exception(int vector, int signo, int err_code,
|
||
|
|
char *remcom_in_buffer,
|
||
|
|
char *remcom_out_buffer,
|
||
|
|
struct pt_regs *regs);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* kgdb_roundup_cpus - Get other CPUs into a holding pattern
|
||
|
|
* @flags: Current IRQ state
|
||
|
|
*
|
||
|
|
* On SMP systems, we need to get the attention of the other CPUs
|
||
|
|
* and get them be in a known state. This should do what is needed
|
||
|
|
* to get the other CPUs to call kgdb_wait(). Note that on some arches,
|
||
|
|
* the NMI approach is not used for rounding up all the CPUs. For example,
|
||
|
|
* in case of MIPS, smp_call_function() is used to roundup CPUs. In
|
||
|
|
* this case, we have to make sure that interrupts are enabled before
|
||
|
|
* calling smp_call_function(). The argument to this function is
|
||
|
|
* the flags that will be used when restoring the interrupts. There is
|
||
|
|
* local_irq_save() call before kgdb_roundup_cpus().
|
||
|
|
*
|
||
|
|
* On non-SMP systems, this is not called.
|
||
|
|
*/
|
||
|
|
extern void kgdb_roundup_cpus(unsigned long flags);
|
||
|
|
|
||
|
|
/* Optional functions. */
|
||
|
|
extern int kgdb_validate_break_address(unsigned long addr);
|
||
|
|
extern int kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr);
|
||
|
|
extern int kgdb_arch_remove_breakpoint(unsigned long addr, char *bundle);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct kgdb_arch - Describe architecture specific values.
|
||
|
|
* @gdb_bpt_instr: The instruction to trigger a breakpoint.
|
||
|
|
* @flags: Flags for the breakpoint, currently just %KGDB_HW_BREAKPOINT.
|
||
|
|
* @set_breakpoint: Allow an architecture to specify how to set a software
|
||
|
|
* breakpoint.
|
||
|
|
* @remove_breakpoint: Allow an architecture to specify how to remove a
|
||
|
|
* software breakpoint.
|
||
|
|
* @set_hw_breakpoint: Allow an architecture to specify how to set a hardware
|
||
|
|
* breakpoint.
|
||
|
|
* @remove_hw_breakpoint: Allow an architecture to specify how to remove a
|
||
|
|
* hardware breakpoint.
|
||
|
|
* @remove_all_hw_break: Allow an architecture to specify how to remove all
|
||
|
|
* hardware breakpoints.
|
||
|
|
* @correct_hw_break: Allow an architecture to specify how to correct the
|
||
|
|
* hardware debug registers.
|
||
|
|
*/
|
||
|
|
struct kgdb_arch {
|
||
|
|
unsigned char gdb_bpt_instr[BREAK_INSTR_SIZE];
|
||
|
|
unsigned long flags;
|
||
|
|
|
||
|
|
int (*set_breakpoint)(unsigned long, char *);
|
||
|
|
int (*remove_breakpoint)(unsigned long, char *);
|
||
|
|
int (*set_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);
|
||
|
|
int (*remove_hw_breakpoint)(unsigned long, int, enum kgdb_bptype);
|
||
|
|
void (*remove_all_hw_break)(void);
|
||
|
|
void (*correct_hw_break)(void);
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct kgdb_io - Describe the interface for an I/O driver to talk with KGDB.
|
||
|
|
* @name: Name of the I/O driver.
|
||
|
|
* @read_char: Pointer to a function that will return one char.
|
||
|
|
* @write_char: Pointer to a function that will write one char.
|
||
|
|
* @flush: Pointer to a function that will flush any pending writes.
|
||
|
|
* @init: Pointer to a function that will initialize the device.
|
||
|
|
* @pre_exception: Pointer to a function that will do any prep work for
|
||
|
|
* the I/O driver.
|
||
|
|
* @post_exception: Pointer to a function that will do any cleanup work
|
||
|
|
* for the I/O driver.
|
||
|
|
*/
|
||
|
|
struct kgdb_io {
|
||
|
|
const char *name;
|
||
|
|
int (*read_char) (void);
|
||
|
|
void (*write_char) (u8);
|
||
|
|
void (*flush) (void);
|
||
|
|
int (*init) (void);
|
||
|
|
void (*pre_exception) (void);
|
||
|
|
void (*post_exception) (void);
|
||
|
|
};
|
||
|
|
|
||
|
|
extern struct kgdb_arch arch_kgdb_ops;
|
||
|
|
|
||
|
|
extern unsigned long __weak kgdb_arch_pc(int exception, struct pt_regs *regs);
|
||
|
|
|
||
|
|
extern int kgdb_register_io_module(struct kgdb_io *local_kgdb_io_ops);
|
||
|
|
extern void kgdb_unregister_io_module(struct kgdb_io *local_kgdb_io_ops);
|
||
|
|
|
||
|
|
extern int kgdb_hex2long(char **ptr, unsigned long *long_val);
|
||
|
|
extern int kgdb_mem2hex(char *mem, char *buf, int count);
|
||
|
|
extern int kgdb_hex2mem(char *buf, char *mem, int count);
|
||
|
|
|
||
|
|
extern int kgdb_isremovedbreak(unsigned long addr);
|
||
|
|
|
||
|
|
extern int
|
||
|
|
kgdb_handle_exception(int ex_vector, int signo, int err_code,
|
||
|
|
struct pt_regs *regs);
|
||
|
|
extern int kgdb_nmicallback(int cpu, void *regs);
|
||
|
|
|
||
|
|
extern int kgdb_single_step;
|
||
|
|
extern atomic_t kgdb_active;
|
||
|
|
|
||
|
|
#endif /* _KGDB_H_ */
|