kgdb.c File Reference

#include <linux/string.h>
#include <linux/signal.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/linkage.h>
#include <linux/reboot.h>
#include <asm/setup.h>
#include <asm/ptrace.h>
#include <arch/svinto.h>
#include <asm/irq.h>

Go to the source code of this file.

Data Structures
struct	register_image

Macros
#define	HEXCHARS_IN_THREAD_ID   16
#define	USEDVAR(name)   { if (name) { ; } }
#define	USEDFUN(name)   { void (*pf)(void) = (void *)name; USEDVAR(pf) }
#define	BUFMAX   512
#define	RUNLENMAX   64
#define	INTERNAL_STACK_SIZE   1024

Typedefs
typedef struct register_image	registers

Enumerations
enum	error_type {   SUCCESS, E01, E02, E03,   E04, E05, E06, E07,   SUCCESS, E01, E02, E03,   E04, E05, E06 }
enum	register_name {   R0, R1, R2, R3,   R4, R5, R6, R7,   R8, R9, R10, R11,   R12, R13, SP, PC,   P0, VR, P2, P3,   P4, CCR, P6, MOF,   P8, IBR, IRP, SRP,   BAR, DCCR, BRP, USP,   R0, R1, R2, R3,   R4, R5, R6, R7,   R8, R9, R10, R11,   R12, R13, SP, ACR,   BZ, VR, PID, SRS,   WZ, EXS, EDA, MOF,   DZ, EBP, ERP, SRP,   NRP, CCS, USP, SPC,   PC, S0, S1, S2,   S3, S4, S5, S6,   S7, S8, S9, S10,   S11, S12, S13, S14,   S15 }

Functions
int	getDebugChar (void)
void	putDebugChar (int val)
void	enableDebugIRQ (void)
void	putDebugString (const unsigned char *str, int length)
void	handle_breakpoint (void)
void	handle_interrupt (void)
void	breakpoint (void)
void	kgdb_handle_breakpoint (void)
	asm (" .global kgdb_handle_breakpoint kgdb_handle_breakpoint: ;; ;; Response to the break-instruction ;; ;; Create a register image of the caller ;; move $dccr,[reg+0x5E] ; Save the flags in DCCR before disable interrupts di ; Disable interrupts move.d $r0,[reg] ; Save R0 move.d $r1,[reg+0x04] ; Save R1 move.d $r2,[reg+0x08] ; Save R2 move.d $r3,[reg+0x0C] ; Save R3 move.d $r4,[reg+0x10] ; Save R4 move.d $r5,[reg+0x14] ; Save R5 move.d $r6,[reg+0x18] ; Save R6 move.d $r7,[reg+0x1C] ; Save R7 move.d $r8,[reg+0x20] ; Save R8 move.d $r9,[reg+0x24] ; Save R9 move.d $r10,[reg+0x28] ; Save R10 move.d $r11,[reg+0x2C] ; Save R11 move.d $r12,[reg+0x30] ; Save R12 move.d $r13,[reg+0x34] ; Save R13 move.d $sp,[reg+0x38] ; Save SP (R14) ;; Due to the old assembler-versions BRP might not be recognized .word 0xE670 ; move brp,$r0 subq 2,$r0 ; Set to address of previous instruction. move.d $r0,[reg+0x3c] ; Save the address in PC (R15) clear.b [reg+0x40] ; Clear P0 move $vr,[reg+0x41] ; Save special register P1 clear.w [reg+0x42] ; Clear P4 move $ccr,[reg+0x44] ; Save special register CCR move $mof,[reg+0x46] ; P7 clear.d [reg+0x4A] ; Clear P8 move $ibr,[reg+0x4E] ; P9, move $irp,[reg+0x52] ; P10, move $srp,[reg+0x56] ; P11, move $dtp0,[reg+0x5A] ; P12, register BAR, assembler might not know BAR ; P13, register DCCR already saved ;; Due to the old assembler-versions BRP might not be recognized .word 0xE670 ; move brp,r0 ;; Static (compiled) breakpoints must return to the next instruction in order ;; to avoid infinite loops. Dynamic (gdb-invoked) must restore the instruction ;; in order to execute it when execution is continued. test.b [is_dyn_brkp] ; Is this a dynamic breakpoint? beq is_static ; No, a static breakpoint nop subq 2,$r0 ; rerun the instruction the break replaced is_static: moveq 1,$r1 move.b $r1,[is_dyn_brkp] ; Set the state variable to dynamic breakpoint move.d $r0,[reg+0x62] ; Save the return address in BRP move $usp,[reg+0x66] ; USP ;; ;; Handle the communication ;; move.d internal_stack+1020,$sp ; Use the internal stack which grows upward moveq 5,$r10 ; SIGTRAP jsr handle_exception ; Interactive routine ;; ;; Return to the caller ;; move.d [reg],$r0 ; Restore R0 move.d [reg+0x04],$r1 ; Restore R1 move.d [reg+0x08],$r2 ; Restore R2 move.d [reg+0x0C],$r3 ; Restore R3 move.d [reg+0x10],$r4 ; Restore R4 move.d [reg+0x14],$r5 ; Restore R5 move.d [reg+0x18],$r6 ; Restore R6 move.d [reg+0x1C],$r7 ; Restore R7 move.d [reg+0x20],$r8 ; Restore R8 move.d [reg+0x24],$r9 ; Restore R9 move.d [reg+0x28],$r10 ; Restore R10 move.d [reg+0x2C],$r11 ; Restore R11 move.d [reg+0x30],$r12 ; Restore R12 move.d [reg+0x34],$r13 ; Restore R13 ;; ;; FIXME: Which registers should be restored? ;; move.d [reg+0x38],$sp ; Restore SP (R14) move [reg+0x56],$srp ; Restore the subroutine return pointer. move [reg+0x5E],$dccr ; Restore DCCR move [reg+0x66],$usp ; Restore USP jump [reg+0x62] ; A jump to the content in register BRP works. nop ; ")
void	kgdb_handle_serial (void)
	asm (" .global kgdb_handle_serial kgdb_handle_serial: ;; ;; Response to a serial interrupt ;; move $dccr,[reg+0x5E] ; Save the flags in DCCR di ; Disable interrupts move.d $r0,[reg] ; Save R0 move.d $r1,[reg+0x04] ; Save R1 move.d $r2,[reg+0x08] ; Save R2 move.d $r3,[reg+0x0C] ; Save R3 move.d $r4,[reg+0x10] ; Save R4 move.d $r5,[reg+0x14] ; Save R5 move.d $r6,[reg+0x18] ; Save R6 move.d $r7,[reg+0x1C] ; Save R7 move.d $r8,[reg+0x20] ; Save R8 move.d $r9,[reg+0x24] ; Save R9 move.d $r10,[reg+0x28] ; Save R10 move.d $r11,[reg+0x2C] ; Save R11 move.d $r12,[reg+0x30] ; Save R12 move.d $r13,[reg+0x34] ; Save R13 move.d $sp,[reg+0x38] ; Save SP (R14) move $irp,[reg+0x3c] ; Save the address in PC (R15) clear.b [reg+0x40] ; Clear P0 move $vr,[reg+0x41] ; Save special register P1, clear.w [reg+0x42] ; Clear P4 move $ccr,[reg+0x44] ; Save special register CCR move $mof,[reg+0x46] ; P7 clear.d [reg+0x4A] ; Clear P8 move $ibr,[reg+0x4E] ; P9, move $irp,[reg+0x52] ; P10, move $srp,[reg+0x56] ; P11, move $dtp0,[reg+0x5A] ; P12, register BAR, assembler might not know BAR ; P13, register DCCR already saved ;; Due to the old assembler-versions BRP might not be recognized .word 0xE670 ; move brp,r0 move.d $r0,[reg+0x62] ; Save the return address in BRP move $usp,[reg+0x66] ; USP ;; get the serial character (from debugport.c) and check if it is a ctrl-c jsr getDebugChar cmp.b 3, $r10 bne goback nop move.d [reg+0x5E], $r10 ; Get DCCR btstq 8, $r10 ; Test the U-flag. bmi goback nop ;; ;; Handle the communication ;; move.d internal_stack+1020,$sp ; Use the internal stack moveq 2,$r10 ; SIGINT jsr handle_exception ; Interactive routine goback: ;; ;; Return to the caller ;; move.d [reg],$r0 ; Restore R0 move.d [reg+0x04],$r1 ; Restore R1 move.d [reg+0x08],$r2 ; Restore R2 move.d [reg+0x0C],$r3 ; Restore R3 move.d [reg+0x10],$r4 ; Restore R4 move.d [reg+0x14],$r5 ; Restore R5 move.d [reg+0x18],$r6 ; Restore R6 move.d [reg+0x1C],$r7 ; Restore R7 move.d [reg+0x20],$r8 ; Restore R8 move.d [reg+0x24],$r9 ; Restore R9 move.d [reg+0x28],$r10 ; Restore R10 move.d [reg+0x2C],$r11 ; Restore R11 move.d [reg+0x30],$r12 ; Restore R12 move.d [reg+0x34],$r13 ; Restore R13 ;; ;; FIXME: Which registers should be restored? ;; move.d [reg+0x38],$sp ; Restore SP (R14) move [reg+0x56],$srp ; Restore the subroutine return pointer. move [reg+0x5E],$dccr ; Restore DCCR move [reg+0x66],$usp ; Restore USP reti ; Return from the interrupt routine nop ")
void	kgdb_init (void)

Variables
unsigned char	executing_task

Macro Definition Documentation

#define BUFMAX   512

Definition at line 346 of file kgdb.c.

#define HEXCHARS_IN_THREAD_ID   16

Definition at line 337 of file kgdb.c.

#define INTERNAL_STACK_SIZE   1024

Definition at line 434 of file kgdb.c.

#define RUNLENMAX   64

Definition at line 349 of file kgdb.c.

#define USEDFUN

(

name

)

{ void (*pf)(void) = (void *)name; USEDVAR(pf) }

Definition at line 341 of file kgdb.c.

#define USEDVAR

(

name

)

{ if (name) { ; } }

Definition at line 340 of file kgdb.c.

Typedef Documentation

typedef struct register_image registers

Enumeration Type Documentation

enum error_type

Enumerator:

SUCCESS
E01
E02
E03
E04
E05
E06
E07
SUCCESS
E01
E02
E03
E04
E05
E06

Definition at line 356 of file kgdb.c.

enum register_name

Enumerator:

R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
SP
PC
P0
VR
P2
P3
P4
CCR
P6
MOF
P8
IBR
IRP
SRP
BAR
DCCR
BRP
USP
R0
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
R13
SP
ACR
BZ
VR
PID
SRS
WZ
EXS
EDA
MOF
DZ
EBP
ERP
SRP
NRP
CCS
USP
SPC
PC
S0
S1
S2
S3
S4
S5
S6
S7
S8
S9
S10
S11
S12
S13
S14
S15

Definition at line 380 of file kgdb.c.

Function Documentation

asm	(	" .global kgdb_handle_breakpointkgdb_handle_breakpoint:;;;; Response to the break-instruction;;;; Create a register image of the caller;; move	$dccr,
		[reg+0x5E] ;Save the flags in DCCR before disable interrupts di;Disable interrupts move.d	$r0,
		[reg] ;Save R0 move.d	$r1,
		[reg+0x04] ;Save R1 move.d	$r2,
		[reg+0x08] ;Save R2 move.d	$r3,
		[reg+0x0C] ;Save R3 move.d	$r4,
		[reg+0x10] ;Save R4 move.d	$r5,
		[reg+0x14] ;Save R5 move.d	$r6,
		[reg+0x18] ;Save R6 move.d	$r7,
		[reg+0x1C] ;Save R7 move.d	$r8,
		[reg+0x20] ;Save R8 move.d	$r9,
		[reg+0x24] ;Save R9 move.d	$r10,
		[reg+0x28] ;Save R10 move.d	$r11,
		[reg+0x2C] ;Save R11 move.d	$r12,
		[reg+0x30] ;Save R12 move.d	$r13,
		[reg+0x34] ;Save R13 move.d	$sp,
		[reg+0x38] ;Save SP(R14);;Due to the old assembler-versions BRP might not be recognized.word 0xE670;move	brp,
			$r0 subq,
			$r0;Set to address of previous instruction.move.d,
		[reg+0x3c] ;Save the address in PC(R15) clear.b;Clear P0 move	$vr[reg+0x40],
		[reg+0x41] ;Save special register P1 clear.w;Clear P4 move	$ccr[reg+0x42],
		[reg+0x44] ;Save special register CCR move	$mof,
		[reg+0x46] ;P7 clear.d;Clear P8 move	$ibr[reg+0x4A],
		[reg+0x4E] ;	P9,
		move	$irp,
		[reg+0x52] ;	P10,
		move	$srp,
		[reg+0x56] ;	P11,
		move	$dtp0,
		[reg+0x5A] ;	P12,
		register	BAR,
		assembler might not know BAR;	P13,
		register DCCR already saved;;Due to the old assembler-versions BRP might not be recognized.word 0xE670;move	brp,
		r0;;Static(compiled) breakpoints must return to the next instruction in order;;to avoid infinite loops.Dynamic(gdb-invoked) must restore the instruction;;in order to execute it when execution is continued.test.b;Is this a dynamic breakpoint?beq is_static;	No[is_dyn_brkp],
		a static breakpoint nop subq	2,
			$r0;rerun the instruction the break replacedis_static:moveq,
			$r1 move.b,
		[is_dyn_brkp] ;Set the state variable to dynamic breakpoint move.d	$r0,
		[reg+0x62] ;Save the return address in BRP move	$usp,
		[reg+0x66] ;USP;;;;Handle the communication;;move.d internal_stack+	1020,
			$sp;Use the internal stack which grows upward moveq,
			$r10;SIGTRAP jsr handle_exception;Interactive routine;;;;Return to the caller;;move.[reg],
			$r0;Restore R0 move.[reg+0x04],
			$r1;Restore R1 move.[reg+0x08],
			$r2;Restore R2 move.[reg+0x0C],
			$r3;Restore R3 move.[reg+0x10],
			$r4;Restore R4 move.[reg+0x14],
			$r5;Restore R5 move.[reg+0x18],
			$r6;Restore R6 move.[reg+0x1C],
			$r7;Restore R7 move.[reg+0x20],
			$r8;Restore R8 move.[reg+0x24],
			$r9;Restore R9 move.[reg+0x28],
			$r10;Restore R10 move.[reg+0x2C],
			$r11;Restore R11 move.[reg+0x30],
			$r12;Restore R12 move.[reg+0x34],
			$r13;Restore R13;;;;FIXME:Which registers should be restored?;;move.[reg+0x38],
			$sp;Restore SP(R14)[reg+0x56],
			$srp;Restore the subroutine return pointer.[reg+0x5E],
			$dccr;Restore DCCR[reg+0x66],
			$usp;Restore USP jump;A jump to the content in register BRP works.nop;"[reg+0x62]
	)

asm	(	" .global kgdb_handle_serialkgdb_handle_serial:;;;; Response to a serial interrupt;; move	$dccr,
		[reg+0x5E] ;Save the flags in DCCR di;Disable interrupts move.d	$r0,
		[reg] ;Save R0 move.d	$r1,
		[reg+0x04] ;Save R1 move.d	$r2,
		[reg+0x08] ;Save R2 move.d	$r3,
		[reg+0x0C] ;Save R3 move.d	$r4,
		[reg+0x10] ;Save R4 move.d	$r5,
		[reg+0x14] ;Save R5 move.d	$r6,
		[reg+0x18] ;Save R6 move.d	$r7,
		[reg+0x1C] ;Save R7 move.d	$r8,
		[reg+0x20] ;Save R8 move.d	$r9,
		[reg+0x24] ;Save R9 move.d	$r10,
		[reg+0x28] ;Save R10 move.d	$r11,
		[reg+0x2C] ;Save R11 move.d	$r12,
		[reg+0x30] ;Save R12 move.d	$r13,
		[reg+0x34] ;Save R13 move.d	$sp,
		[reg+0x38] ;Save SP(R14) move	$irp,
		[reg+0x3c] ;Save the address in PC(R15) clear.b;Clear P0 move	$vr[reg+0x40],
		[reg+0x41] ;Save special register	P1,
		clear.w;Clear P4 move	$ccr[reg+0x42],
		[reg+0x44] ;Save special register CCR move	$mof,
		[reg+0x46] ;P7 clear.d;Clear P8 move	$ibr[reg+0x4A],
		[reg+0x4E] ;	P9,
		move	$irp,
		[reg+0x52] ;	P10,
		move	$srp,
		[reg+0x56] ;	P11,
		move	$dtp0,
		[reg+0x5A] ;	P12,
		register	BAR,
		assembler might not know BAR;	P13,
		register DCCR already saved;;Due to the old assembler-versions BRP might not be recognized.word 0xE670;move	brp,
		r0 move.d	$r0,
		[reg+0x62] ;Save the return address in BRP move	$usp,
		[reg+0x66] ;USP;;get the serial character(from debugport.c) and check if it is a ctrl-c jsr getDebugChar cmp.b	3,
			$r10 bne goback nop move.[reg+0x5E],
			$r10;Get DCCR btstq,
			$r10;Test the U-flag.bmi goback nop;;;;Handle the communication;;move.d internal_stack+,
			$sp;Use the internal stack moveq,
			$r10;SIGINT jsr handle_exception;Interactive routinegoback:;;;;Return to the caller;;move.[reg],
			$r0;Restore R0 move.[reg+0x04],
			$r1;Restore R1 move.[reg+0x08],
			$r2;Restore R2 move.[reg+0x0C],
			$r3;Restore R3 move.[reg+0x10],
			$r4;Restore R4 move.[reg+0x14],
			$r5;Restore R5 move.[reg+0x18],
			$r6;Restore R6 move.[reg+0x1C],
			$r7;Restore R7 move.[reg+0x20],
			$r8;Restore R8 move.[reg+0x24],
			$r9;Restore R9 move.[reg+0x28],
			$r10;Restore R10 move.[reg+0x2C],
			$r11;Restore R11 move.[reg+0x30],
			$r12;Restore R12 move.[reg+0x34],
			$r13;Restore R13;;;;FIXME:Which registers should be restored?;;move.[reg+0x38],
			$sp;Restore SP(R14)[reg+0x56],
			$srp;Restore the subroutine return pointer.[reg+0x5E],
			$dccr;Restore DCCR[reg+0x66],
			$usp;Restore USP reti;Return from the interrupt routine nop"
	)

void breakpoint

(

void

)

Definition at line 1462 of file kgdb.c.

void enableDebugIRQ

(

void

)

Definition at line 371 of file debugport.c.

int getDebugChar

(

void

)

Definition at line 341 of file debugport.c.

void handle_breakpoint

(

void

)

void handle_interrupt

(

void

)

void kgdb_handle_breakpoint

(

void

)

void kgdb_handle_serial

(

void

)

void kgdb_init

(

void

)

Definition at line 1472 of file kgdb.c.

void putDebugChar

(

int

val

)

Definition at line 358 of file debugport.c.

void putDebugString	(	const unsigned char *	str,
		int	length
	)

Definition at line 841 of file kgdb.c.

Variable Documentation

unsigned char executing_task