iPXE
Data Structures | Enumerations | Functions | Variables
gdbstub.c File Reference

GDB stub for remote debugging. More...

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <byteswap.h>
#include <ipxe/gdbstub.h>
#include "gdbmach.h"

Go to the source code of this file.

Data Structures

struct  gdbstub
 

Enumerations

enum  { POSIX_EINVAL = 0x1c, SIZEOF_PAYLOAD = 512 }
 

Functions

 FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
 
static void gdbstub_state_new (struct gdbstub *stub, char ch)
 
static void gdbstub_state_data (struct gdbstub *stub, char ch)
 
static void gdbstub_state_cksum1 (struct gdbstub *stub, char ch)
 
static void gdbstub_state_cksum2 (struct gdbstub *stub, char ch)
 
static void gdbstub_state_wait_ack (struct gdbstub *stub, char ch)
 
static uint8_t gdbstub_from_hex_digit (char ch)
 
static uint8_t gdbstub_to_hex_digit (uint8_t b)
 
static void gdbstub_from_hex_buf (char *dst, char *src, int lenbytes)
 
static void gdbstub_to_hex_buf (char *dst, char *src, int lenbytes)
 
static uint8_t gdbstub_cksum (char *data, int len)
 
static void gdbstub_tx_packet (struct gdbstub *stub)
 
static void gdbstub_send_ok (struct gdbstub *stub)
 
static void gdbstub_send_num_packet (struct gdbstub *stub, char reply, int num)
 
static int gdbstub_get_packet_args (struct gdbstub *stub, unsigned long *args, int nargs, int *stop_idx)
 
static void gdbstub_send_errno (struct gdbstub *stub, int errno)
 
static void gdbstub_report_signal (struct gdbstub *stub)
 
static void gdbstub_read_regs (struct gdbstub *stub)
 
static void gdbstub_write_regs (struct gdbstub *stub)
 
static void gdbstub_read_mem (struct gdbstub *stub)
 
static void gdbstub_write_mem (struct gdbstub *stub)
 
static void gdbstub_continue (struct gdbstub *stub, int single_step)
 
static void gdbstub_breakpoint (struct gdbstub *stub)
 
static void gdbstub_rx_packet (struct gdbstub *stub)
 
static void gdbstub_parse (struct gdbstub *stub, char ch)
 
void gdbstub_handler (int signo, gdbreg_t *regs)
 Interrupt handler. More...
 
struct gdb_transportfind_gdb_transport (const char *name)
 Look up GDB transport by name. More...
 
void gdbstub_start (struct gdb_transport *trans)
 Break into the debugger using the given transport. More...
 

Variables

static struct gdbstub stub
 

Detailed Description

GDB stub for remote debugging.

Definition in file gdbstub.c.

Enumeration Type Documentation

◆ anonymous enum

anonymous enum
Enumerator
POSIX_EINVAL 
SIZEOF_PAYLOAD 

Definition at line 41 of file gdbstub.c.

41  {
42  POSIX_EINVAL = 0x1c, /* used to report bad arguments to GDB */
43  SIZEOF_PAYLOAD = 512, /* buffer size of GDB payload data */
44 };

Function Documentation

◆ FILE_LICENCE()

FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL  )

◆ gdbstub_state_new()

static void gdbstub_state_new ( struct gdbstub stub,
char  ch 
)
static

Definition at line 312 of file gdbstub.c.

312  {
313  if ( ch == '$' ) {
314  stub->len = 0;
316  }
317 }
void(* parse)(struct gdbstub *stub, char ch)
Definition: gdbstub.c:53
static void gdbstub_state_data(struct gdbstub *stub, char ch)
Definition: gdbstub.c:319
uint8_t ch
Definition: registers.h:83
static struct gdbstub stub
Definition: gdbstub.c:368
int len
Definition: gdbstub.c:61

References ch, gdbstub_state_data(), gdbstub::len, gdbstub::parse, and stub.

Referenced by gdbstub_state_cksum2(), and gdbstub_state_wait_ack().

◆ gdbstub_state_data()

static void gdbstub_state_data ( struct gdbstub stub,
char  ch 
)
static

Definition at line 319 of file gdbstub.c.

319  {
320  if ( ch == '#' ) {
322  } else if ( ch == '$' ) {
323  stub->len = 0; /* retry new packet */
324  } else {
325  /* If the length exceeds our buffer, let the checksum fail */
326  if ( stub->len < SIZEOF_PAYLOAD ) {
327  stub->payload [ stub->len++ ] = ch;
328  }
329  }
330 }
void(* parse)(struct gdbstub *stub, char ch)
Definition: gdbstub.c:53
static void gdbstub_state_cksum1(struct gdbstub *stub, char ch)
Definition: gdbstub.c:332
uint8_t ch
Definition: registers.h:83
char * payload
Definition: gdbstub.c:60
static struct gdbstub stub
Definition: gdbstub.c:368
int len
Definition: gdbstub.c:61

References ch, gdbstub_state_cksum1(), gdbstub::len, gdbstub::parse, gdbstub::payload, SIZEOF_PAYLOAD, and stub.

Referenced by gdbstub_state_new().

◆ gdbstub_state_cksum1()

static void gdbstub_state_cksum1 ( struct gdbstub stub,
char  ch 
)
static

Definition at line 332 of file gdbstub.c.

332  {
333  stub->cksum1 = gdbstub_from_hex_digit ( ch ) << 4;
335 }
void(* parse)(struct gdbstub *stub, char ch)
Definition: gdbstub.c:53
static void gdbstub_state_cksum2(struct gdbstub *stub, char ch)
Definition: gdbstub.c:337
uint8_t ch
Definition: registers.h:83
static uint8_t gdbstub_from_hex_digit(char ch)
Definition: gdbstub.c:71
static struct gdbstub stub
Definition: gdbstub.c:368
uint8_t cksum1
Definition: gdbstub.c:54

References ch, gdbstub::cksum1, gdbstub_from_hex_digit(), gdbstub_state_cksum2(), gdbstub::parse, and stub.

Referenced by gdbstub_state_data().

◆ gdbstub_state_cksum2()

static void gdbstub_state_cksum2 ( struct gdbstub stub,
char  ch 
)
static

Definition at line 337 of file gdbstub.c.

337  {
338  uint8_t their_cksum;
339  uint8_t our_cksum;
340 
342  their_cksum = stub->cksum1 + gdbstub_from_hex_digit ( ch );
343  our_cksum = gdbstub_cksum ( stub->payload, stub->len );
344  if ( their_cksum == our_cksum ) {
345  stub->trans->send ( "+", 1 );
346  if ( stub->len > 0 ) {
348  }
349  } else {
350  stub->trans->send ( "-", 1 );
351  }
352 }
static uint8_t gdbstub_cksum(char *data, int len)
Definition: gdbstub.c:137
void(* parse)(struct gdbstub *stub, char ch)
Definition: gdbstub.c:53
uint8_t ch
Definition: registers.h:83
char * payload
Definition: gdbstub.c:60
static uint8_t gdbstub_from_hex_digit(char ch)
Definition: gdbstub.c:71
struct gdb_transport * trans
Definition: gdbstub.c:47
static struct gdbstub stub
Definition: gdbstub.c:368
uint8_t cksum1
Definition: gdbstub.c:54
unsigned char uint8_t
Definition: stdint.h:10
static void gdbstub_rx_packet(struct gdbstub *stub)
Definition: gdbstub.c:274
int len
Definition: gdbstub.c:61
void(* send)(const char *buf, size_t len)
Write, may block.
Definition: gdbstub.h:47
static void gdbstub_state_new(struct gdbstub *stub, char ch)
Definition: gdbstub.c:312

References ch, gdbstub::cksum1, gdbstub_cksum(), gdbstub_from_hex_digit(), gdbstub_rx_packet(), gdbstub_state_new(), gdbstub::len, gdbstub::parse, gdbstub::payload, gdb_transport::send, stub, and gdbstub::trans.

Referenced by gdbstub_state_cksum1().

◆ gdbstub_state_wait_ack()

static void gdbstub_state_wait_ack ( struct gdbstub stub,
char  ch 
)
static

Definition at line 354 of file gdbstub.c.

354  {
355  if ( ch == '+' ) {
357  } else {
358  /* This retransmit is very aggressive but necessary to keep
359  * in sync with GDB. */
361  }
362 }
void(* parse)(struct gdbstub *stub, char ch)
Definition: gdbstub.c:53
uint8_t ch
Definition: registers.h:83
static void gdbstub_tx_packet(struct gdbstub *stub)
Definition: gdbstub.c:145
static struct gdbstub stub
Definition: gdbstub.c:368
static void gdbstub_state_new(struct gdbstub *stub, char ch)
Definition: gdbstub.c:312

References ch, gdbstub_state_new(), gdbstub_tx_packet(), gdbstub::parse, and stub.

Referenced by gdbstub_tx_packet().

◆ gdbstub_from_hex_digit()

static uint8_t gdbstub_from_hex_digit ( char  ch)
static

Definition at line 71 of file gdbstub.c.

71  {
72  return ( isdigit ( ch ) ? ch - '0' : tolower ( ch ) - 'a' + 0xa ) & 0xf;
73 }
uint8_t ch
Definition: registers.h:83
static int isdigit(int character)
Check if character is a decimal digit.
Definition: ctype.h:18
static int tolower(int character)
Convert character to lower case.
Definition: ctype.h:97

References ch, isdigit(), and tolower().

Referenced by gdbstub_from_hex_buf(), gdbstub_get_packet_args(), gdbstub_state_cksum1(), and gdbstub_state_cksum2().

◆ gdbstub_to_hex_digit()

static uint8_t gdbstub_to_hex_digit ( uint8_t  b)
static

Definition at line 75 of file gdbstub.c.

75  {
76  b &= 0xf;
77  return ( b < 0xa ? '0' : 'a' - 0xa ) + b;
78 }

Referenced by gdbstub_send_num_packet(), gdbstub_to_hex_buf(), and gdbstub_tx_packet().

◆ gdbstub_from_hex_buf()

static void gdbstub_from_hex_buf ( char *  dst,
char *  src,
int  lenbytes 
)
static

Definition at line 85 of file gdbstub.c.

85  {
86  if ( lenbytes == 2 && ( ( unsigned long ) dst & 0x1 ) == 0 ) {
87  uint16_t i = gdbstub_from_hex_digit ( src [ 2 ] ) << 12 |
88  gdbstub_from_hex_digit ( src [ 3 ] ) << 8 |
89  gdbstub_from_hex_digit ( src [ 0 ] ) << 4 |
90  gdbstub_from_hex_digit ( src [ 1 ] );
91  * ( uint16_t * ) dst = cpu_to_le16 ( i );
92  } else if ( lenbytes == 4 && ( ( unsigned long ) dst & 0x3 ) == 0 ) {
93  uint32_t i = gdbstub_from_hex_digit ( src [ 6 ] ) << 28 |
94  gdbstub_from_hex_digit ( src [ 7 ] ) << 24 |
95  gdbstub_from_hex_digit ( src [ 4 ] ) << 20 |
96  gdbstub_from_hex_digit ( src [ 5 ] ) << 16 |
97  gdbstub_from_hex_digit ( src [ 2 ] ) << 12 |
98  gdbstub_from_hex_digit ( src [ 3 ] ) << 8 |
99  gdbstub_from_hex_digit ( src [ 0 ] ) << 4 |
100  gdbstub_from_hex_digit ( src [ 1 ] );
101  * ( uint32_t * ) dst = cpu_to_le32 ( i );
102  } else {
103  while ( lenbytes-- > 0 ) {
104  *dst++ = gdbstub_from_hex_digit ( src [ 0 ] ) << 4 |
105  gdbstub_from_hex_digit ( src [ 1 ] );
106  src += 2;
107  }
108  }
109 }
unsigned short uint16_t
Definition: stdint.h:11
static uint8_t gdbstub_from_hex_digit(char ch)
Definition: gdbstub.c:71
#define cpu_to_le32(value)
Definition: byteswap.h:107
static __always_inline void off_t userptr_t src
Definition: efi_uaccess.h:66
unsigned int uint32_t
Definition: stdint.h:12
#define cpu_to_le16(value)
Definition: byteswap.h:106

References cpu_to_le16, cpu_to_le32, gdbstub_from_hex_digit(), and src.

Referenced by gdbstub_write_mem(), and gdbstub_write_regs().

◆ gdbstub_to_hex_buf()

static void gdbstub_to_hex_buf ( char *  dst,
char *  src,
int  lenbytes 
)
static

Definition at line 111 of file gdbstub.c.

111  {
112  if ( lenbytes == 2 && ( ( unsigned long ) src & 0x1 ) == 0 ) {
113  uint16_t i = cpu_to_le16 ( * ( uint16_t * ) src );
114  dst [ 0 ] = gdbstub_to_hex_digit ( i >> 4 );
115  dst [ 1 ] = gdbstub_to_hex_digit ( i );
116  dst [ 2 ] = gdbstub_to_hex_digit ( i >> 12 );
117  dst [ 3 ] = gdbstub_to_hex_digit ( i >> 8 );
118  } else if ( lenbytes == 4 && ( ( unsigned long ) src & 0x3 ) == 0 ) {
119  uint32_t i = cpu_to_le32 ( * ( uint32_t * ) src );
120  dst [ 0 ] = gdbstub_to_hex_digit ( i >> 4 );
121  dst [ 1 ] = gdbstub_to_hex_digit ( i );
122  dst [ 2 ] = gdbstub_to_hex_digit ( i >> 12 );
123  dst [ 3 ] = gdbstub_to_hex_digit ( i >> 8 );
124  dst [ 4 ] = gdbstub_to_hex_digit ( i >> 20 );
125  dst [ 5 ] = gdbstub_to_hex_digit ( i >> 16);
126  dst [ 6 ] = gdbstub_to_hex_digit ( i >> 28 );
127  dst [ 7 ] = gdbstub_to_hex_digit ( i >> 24 );
128  } else {
129  while ( lenbytes-- > 0 ) {
130  *dst++ = gdbstub_to_hex_digit ( *src >> 4 );
131  *dst++ = gdbstub_to_hex_digit ( *src );
132  src++;
133  }
134  }
135 }
unsigned short uint16_t
Definition: stdint.h:11
#define cpu_to_le32(value)
Definition: byteswap.h:107
static __always_inline void off_t userptr_t src
Definition: efi_uaccess.h:66
unsigned int uint32_t
Definition: stdint.h:12
static uint8_t gdbstub_to_hex_digit(uint8_t b)
Definition: gdbstub.c:75
#define cpu_to_le16(value)
Definition: byteswap.h:106

References cpu_to_le16, cpu_to_le32, gdbstub_to_hex_digit(), and src.

Referenced by gdbstub_read_mem(), and gdbstub_read_regs().

◆ gdbstub_cksum()

static uint8_t gdbstub_cksum ( char *  data,
int  len 
)
static

Definition at line 137 of file gdbstub.c.

137  {
138  uint8_t cksum = 0;
139  while ( len-- > 0 ) {
140  cksum += ( uint8_t ) *data++;
141  }
142  return cksum;
143 }
unsigned char uint8_t
Definition: stdint.h:10
uint32_t len
Length.
Definition: ena.h:14
struct arbelprm_port_state_change_st data
Message.
Definition: arbel.h:12

References data, and len.

Referenced by gdbstub_state_cksum2(), and gdbstub_tx_packet().

◆ gdbstub_tx_packet()

static void gdbstub_tx_packet ( struct gdbstub stub)
static

Definition at line 145 of file gdbstub.c.

145  {
146  uint8_t cksum = gdbstub_cksum ( stub->payload, stub->len );
147  stub->buf [ 0 ] = '$';
148  stub->buf [ stub->len + 1 ] = '#';
149  stub->buf [ stub->len + 2 ] = gdbstub_to_hex_digit ( cksum >> 4 );
150  stub->buf [ stub->len + 3 ] = gdbstub_to_hex_digit ( cksum );
151  stub->trans->send ( stub->buf, stub->len + 4 );
153 }
static uint8_t gdbstub_cksum(char *data, int len)
Definition: gdbstub.c:137
static void gdbstub_state_wait_ack(struct gdbstub *stub, char ch)
Definition: gdbstub.c:354
void(* parse)(struct gdbstub *stub, char ch)
Definition: gdbstub.c:53
char * payload
Definition: gdbstub.c:60
char buf[SIZEOF_PAYLOAD+4]
Definition: gdbstub.c:59
struct gdb_transport * trans
Definition: gdbstub.c:47
static struct gdbstub stub
Definition: gdbstub.c:368
unsigned char uint8_t
Definition: stdint.h:10
static uint8_t gdbstub_to_hex_digit(uint8_t b)
Definition: gdbstub.c:75
int len
Definition: gdbstub.c:61
void(* send)(const char *buf, size_t len)
Write, may block.
Definition: gdbstub.h:47

References gdbstub::buf, gdbstub_cksum(), gdbstub_state_wait_ack(), gdbstub_to_hex_digit(), gdbstub::len, gdbstub::parse, gdbstub::payload, gdb_transport::send, stub, and gdbstub::trans.

Referenced by gdbstub_breakpoint(), gdbstub_read_mem(), gdbstub_read_regs(), gdbstub_rx_packet(), gdbstub_send_num_packet(), gdbstub_send_ok(), and gdbstub_state_wait_ack().

◆ gdbstub_send_ok()

static void gdbstub_send_ok ( struct gdbstub stub)
static

Definition at line 156 of file gdbstub.c.

156  {
157  stub->payload [ 0 ] = 'O';
158  stub->payload [ 1 ] = 'K';
159  stub->len = 2;
161 }
char * payload
Definition: gdbstub.c:60
static void gdbstub_tx_packet(struct gdbstub *stub)
Definition: gdbstub.c:145
static struct gdbstub stub
Definition: gdbstub.c:368
int len
Definition: gdbstub.c:61

References gdbstub_tx_packet(), gdbstub::len, gdbstub::payload, and stub.

Referenced by gdbstub_breakpoint(), gdbstub_rx_packet(), gdbstub_write_mem(), and gdbstub_write_regs().

◆ gdbstub_send_num_packet()

static void gdbstub_send_num_packet ( struct gdbstub stub,
char  reply,
int  num 
)
static

Definition at line 163 of file gdbstub.c.

163  {
164  stub->payload [ 0 ] = reply;
165  stub->payload [ 1 ] = gdbstub_to_hex_digit ( ( char ) num >> 4 );
166  stub->payload [ 2 ] = gdbstub_to_hex_digit ( ( char ) num );
167  stub->len = 3;
169 }
char * payload
Definition: gdbstub.c:60
static void gdbstub_tx_packet(struct gdbstub *stub)
Definition: gdbstub.c:145
char unsigned long * num
Definition: xenstore.h:17
static struct gdbstub stub
Definition: gdbstub.c:368
static uint8_t gdbstub_to_hex_digit(uint8_t b)
Definition: gdbstub.c:75
int len
Definition: gdbstub.c:61

References gdbstub_to_hex_digit(), gdbstub_tx_packet(), gdbstub::len, num, gdbstub::payload, and stub.

Referenced by gdbstub_report_signal(), and gdbstub_send_errno().

◆ gdbstub_get_packet_args()

static int gdbstub_get_packet_args ( struct gdbstub stub,
unsigned long *  args,
int  nargs,
int *  stop_idx 
)
static

Definition at line 172 of file gdbstub.c.

172  {
173  int i;
174  char ch = 0;
175  int argc = 0;
176  unsigned long val = 0;
177  for ( i = 1; i < stub->len && argc < nargs; i++ ) {
178  ch = stub->payload [ i ];
179  if ( ch == ':' ) {
180  break;
181  } else if ( ch == ',' ) {
182  args [ argc++ ] = val;
183  val = 0;
184  } else {
185  val = ( val << 4 ) | gdbstub_from_hex_digit ( ch );
186  }
187  }
188  if ( stop_idx ) {
189  *stop_idx = i;
190  }
191  if ( argc < nargs ) {
192  args [ argc++ ] = val;
193  }
194  return ( ( i == stub->len || ch == ':' ) && argc == nargs );
195 }
uint8_t ch
Definition: registers.h:83
char * payload
Definition: gdbstub.c:60
static uint8_t gdbstub_from_hex_digit(char ch)
Definition: gdbstub.c:71
static struct gdbstub stub
Definition: gdbstub.c:368
void __asmcall int val
Definition: setjmp.h:28
int len
Definition: gdbstub.c:61

References ch, gdbstub_from_hex_digit(), gdbstub::len, gdbstub::payload, stub, and val.

Referenced by gdbstub_breakpoint(), gdbstub_continue(), gdbstub_read_mem(), and gdbstub_write_mem().

◆ gdbstub_send_errno()

static void gdbstub_send_errno ( struct gdbstub stub,
int  errno 
)
static

Definition at line 197 of file gdbstub.c.

197  {
199 }
static void gdbstub_send_num_packet(struct gdbstub *stub, char reply, int num)
Definition: gdbstub.c:163
int errno
Global "last error" number.
Definition: errno.c:20
static struct gdbstub stub
Definition: gdbstub.c:368

References errno, gdbstub_send_num_packet(), and stub.

Referenced by gdbstub_breakpoint(), gdbstub_read_mem(), gdbstub_write_mem(), and gdbstub_write_regs().

◆ gdbstub_report_signal()

static void gdbstub_report_signal ( struct gdbstub stub)
static

Definition at line 201 of file gdbstub.c.

201  {
203 }
static void gdbstub_send_num_packet(struct gdbstub *stub, char reply, int num)
Definition: gdbstub.c:163
int signo
Definition: gdbstub.c:50
static struct gdbstub stub
Definition: gdbstub.c:368

References gdbstub_send_num_packet(), gdbstub::signo, and stub.

Referenced by gdbstub_handler(), and gdbstub_rx_packet().

◆ gdbstub_read_regs()

static void gdbstub_read_regs ( struct gdbstub stub)
static

Definition at line 205 of file gdbstub.c.

205  {
209 }
char * payload
Definition: gdbstub.c:60
static void gdbstub_tx_packet(struct gdbstub *stub)
Definition: gdbstub.c:145
static struct gdbstub stub
Definition: gdbstub.c:368
gdbreg_t * regs
Definition: gdbstub.c:51
int len
Definition: gdbstub.c:61
static void gdbstub_to_hex_buf(char *dst, char *src, int lenbytes)
Definition: gdbstub.c:111

References GDBMACH_SIZEOF_REGS, gdbstub_to_hex_buf(), gdbstub_tx_packet(), gdbstub::len, gdbstub::payload, gdbstub::regs, and stub.

Referenced by gdbstub_rx_packet().

◆ gdbstub_write_regs()

static void gdbstub_write_regs ( struct gdbstub stub)
static

Definition at line 211 of file gdbstub.c.

211  {
212  if ( stub->len != 1 + GDBMACH_SIZEOF_REGS * 2 ) {
214  return;
215  }
216  gdbstub_from_hex_buf ( ( char * ) stub->regs, &stub->payload [ 1 ], GDBMACH_SIZEOF_REGS );
217  gdbstub_send_ok ( stub );
218 }
char * payload
Definition: gdbstub.c:60
static void gdbstub_send_errno(struct gdbstub *stub, int errno)
Definition: gdbstub.c:197
static struct gdbstub stub
Definition: gdbstub.c:368
gdbreg_t * regs
Definition: gdbstub.c:51
static void gdbstub_send_ok(struct gdbstub *stub)
Definition: gdbstub.c:156
int len
Definition: gdbstub.c:61
static void gdbstub_from_hex_buf(char *dst, char *src, int lenbytes)
Definition: gdbstub.c:85

References GDBMACH_SIZEOF_REGS, gdbstub_from_hex_buf(), gdbstub_send_errno(), gdbstub_send_ok(), gdbstub::len, gdbstub::payload, POSIX_EINVAL, gdbstub::regs, and stub.

Referenced by gdbstub_rx_packet().

◆ gdbstub_read_mem()

static void gdbstub_read_mem ( struct gdbstub stub)
static

Definition at line 220 of file gdbstub.c.

220  {
221  unsigned long args [ 2 ];
222  if ( !gdbstub_get_packet_args ( stub, args, sizeof args / sizeof args [ 0 ], NULL ) ) {
224  return;
225  }
226  args [ 1 ] = ( args [ 1 ] < SIZEOF_PAYLOAD / 2 ) ? args [ 1 ] : SIZEOF_PAYLOAD / 2;
227  gdbstub_to_hex_buf ( stub->payload, ( char * ) args [ 0 ], args [ 1 ] );
228  stub->len = args [ 1 ] * 2;
230 }
static int gdbstub_get_packet_args(struct gdbstub *stub, unsigned long *args, int nargs, int *stop_idx)
Definition: gdbstub.c:172
char * payload
Definition: gdbstub.c:60
static void gdbstub_tx_packet(struct gdbstub *stub)
Definition: gdbstub.c:145
static void gdbstub_send_errno(struct gdbstub *stub, int errno)
Definition: gdbstub.c:197
static struct gdbstub stub
Definition: gdbstub.c:368
int len
Definition: gdbstub.c:61
static void gdbstub_to_hex_buf(char *dst, char *src, int lenbytes)
Definition: gdbstub.c:111
#define NULL
NULL pointer (VOID *)
Definition: Base.h:362

References gdbstub_get_packet_args(), gdbstub_send_errno(), gdbstub_to_hex_buf(), gdbstub_tx_packet(), gdbstub::len, NULL, gdbstub::payload, POSIX_EINVAL, SIZEOF_PAYLOAD, and stub.

Referenced by gdbstub_rx_packet().

◆ gdbstub_write_mem()

static void gdbstub_write_mem ( struct gdbstub stub)
static

Definition at line 232 of file gdbstub.c.

232  {
233  unsigned long args [ 2 ];
234  int colon;
235  if ( !gdbstub_get_packet_args ( stub, args, sizeof args / sizeof args [ 0 ], &colon ) ||
236  colon >= stub->len || stub->payload [ colon ] != ':' ||
237  ( stub->len - colon - 1 ) % 2 != 0 ) {
239  return;
240  }
241  gdbstub_from_hex_buf ( ( char * ) args [ 0 ], &stub->payload [ colon + 1 ], ( stub->len - colon - 1 ) / 2 );
242  gdbstub_send_ok ( stub );
243 }
static int gdbstub_get_packet_args(struct gdbstub *stub, unsigned long *args, int nargs, int *stop_idx)
Definition: gdbstub.c:172
char * payload
Definition: gdbstub.c:60
static void gdbstub_send_errno(struct gdbstub *stub, int errno)
Definition: gdbstub.c:197
static struct gdbstub stub
Definition: gdbstub.c:368
static void gdbstub_send_ok(struct gdbstub *stub)
Definition: gdbstub.c:156
int len
Definition: gdbstub.c:61
static void gdbstub_from_hex_buf(char *dst, char *src, int lenbytes)
Definition: gdbstub.c:85

References gdbstub_from_hex_buf(), gdbstub_get_packet_args(), gdbstub_send_errno(), gdbstub_send_ok(), gdbstub::len, gdbstub::payload, POSIX_EINVAL, and stub.

Referenced by gdbstub_rx_packet().

◆ gdbstub_continue()

static void gdbstub_continue ( struct gdbstub stub,
int  single_step 
)
static

Definition at line 245 of file gdbstub.c.

245  {
246  gdbreg_t pc;
247  if ( stub->len > 1 && gdbstub_get_packet_args ( stub, &pc, 1, NULL ) ) {
248  gdbmach_set_pc ( stub->regs, pc );
249  }
250  gdbmach_set_single_step ( stub->regs, single_step );
251  stub->exit_handler = 1;
252  /* Reply will be sent when we hit the next breakpoint or interrupt */
253 }
static void gdbmach_set_single_step(gdbreg_t *regs, int step)
Definition: gdbmach.h:59
unsigned long gdbreg_t
Definition: gdbmach.h:15
static void gdbmach_set_pc(gdbreg_t *regs, gdbreg_t pc)
Definition: gdbmach.h:55
static int gdbstub_get_packet_args(struct gdbstub *stub, unsigned long *args, int nargs, int *stop_idx)
Definition: gdbstub.c:172
int exit_handler
Definition: gdbstub.c:48
static struct gdbstub stub
Definition: gdbstub.c:368
gdbreg_t * regs
Definition: gdbstub.c:51
int len
Definition: gdbstub.c:61
#define NULL
NULL pointer (VOID *)
Definition: Base.h:362

References gdbstub::exit_handler, gdbmach_set_pc(), gdbmach_set_single_step(), gdbstub_get_packet_args(), gdbstub::len, NULL, gdbstub::regs, and stub.

Referenced by gdbstub_rx_packet().

◆ gdbstub_breakpoint()

static void gdbstub_breakpoint ( struct gdbstub stub)
static

Definition at line 255 of file gdbstub.c.

255  {
256  unsigned long args [ 3 ];
257  int enable = stub->payload [ 0 ] == 'Z' ? 1 : 0;
258  int rc;
259 
260  if ( !gdbstub_get_packet_args ( stub, args, sizeof args / sizeof args [ 0 ], NULL ) ) {
262  return;
263  }
264  if ( ( rc = gdbmach_set_breakpoint ( args [ 0 ], args [ 1 ],
265  args [ 2 ], enable ) ) != 0 ) {
266  /* Not supported */
267  stub->len = 0;
269  return;
270  }
271  gdbstub_send_ok ( stub );
272 }
struct arbelprm_rc_send_wqe rc
Definition: arbel.h:14
int gdbmach_set_breakpoint(int type, unsigned long addr, size_t len, int enable)
Set hardware breakpoint.
Definition: gdbmach.c:134
static int gdbstub_get_packet_args(struct gdbstub *stub, unsigned long *args, int nargs, int *stop_idx)
Definition: gdbstub.c:172
char * payload
Definition: gdbstub.c:60
static void gdbstub_tx_packet(struct gdbstub *stub)
Definition: gdbstub.c:145
static void gdbstub_send_errno(struct gdbstub *stub, int errno)
Definition: gdbstub.c:197
static struct gdbstub stub
Definition: gdbstub.c:368
static void gdbstub_send_ok(struct gdbstub *stub)
Definition: gdbstub.c:156
int len
Definition: gdbstub.c:61
#define NULL
NULL pointer (VOID *)
Definition: Base.h:362

References gdbmach_set_breakpoint(), gdbstub_get_packet_args(), gdbstub_send_errno(), gdbstub_send_ok(), gdbstub_tx_packet(), gdbstub::len, NULL, gdbstub::payload, POSIX_EINVAL, rc, and stub.

Referenced by gdbstub_rx_packet().

◆ gdbstub_rx_packet()

static void gdbstub_rx_packet ( struct gdbstub stub)
static

Definition at line 274 of file gdbstub.c.

274  {
275  switch ( stub->payload [ 0 ] ) {
276  case '?':
278  break;
279  case 'g':
281  break;
282  case 'G':
284  break;
285  case 'm':
287  break;
288  case 'M':
290  break;
291  case 'c': /* Continue */
292  case 'k': /* Kill */
293  case 's': /* Step */
294  case 'D': /* Detach */
295  gdbstub_continue ( stub, stub->payload [ 0 ] == 's' );
296  if ( stub->payload [ 0 ] == 'D' ) {
297  gdbstub_send_ok ( stub );
298  }
299  break;
300  case 'Z': /* Insert breakpoint */
301  case 'z': /* Remove breakpoint */
303  break;
304  default:
305  stub->len = 0;
307  break;
308  }
309 }
static void gdbstub_continue(struct gdbstub *stub, int single_step)
Definition: gdbstub.c:245
static void gdbstub_report_signal(struct gdbstub *stub)
Definition: gdbstub.c:201
static void gdbstub_write_regs(struct gdbstub *stub)
Definition: gdbstub.c:211
char * payload
Definition: gdbstub.c:60
static void gdbstub_tx_packet(struct gdbstub *stub)
Definition: gdbstub.c:145
static void gdbstub_read_regs(struct gdbstub *stub)
Definition: gdbstub.c:205
static void gdbstub_breakpoint(struct gdbstub *stub)
Definition: gdbstub.c:255
static struct gdbstub stub
Definition: gdbstub.c:368
static void gdbstub_write_mem(struct gdbstub *stub)
Definition: gdbstub.c:232
static void gdbstub_read_mem(struct gdbstub *stub)
Definition: gdbstub.c:220
static void gdbstub_send_ok(struct gdbstub *stub)
Definition: gdbstub.c:156
int len
Definition: gdbstub.c:61

References gdbstub_breakpoint(), gdbstub_continue(), gdbstub_read_mem(), gdbstub_read_regs(), gdbstub_report_signal(), gdbstub_send_ok(), gdbstub_tx_packet(), gdbstub_write_mem(), gdbstub_write_regs(), gdbstub::len, gdbstub::payload, and stub.

Referenced by gdbstub_state_cksum2().

◆ gdbstub_parse()

static void gdbstub_parse ( struct gdbstub stub,
char  ch 
)
static

Definition at line 364 of file gdbstub.c.

364  {
365  stub->parse ( stub, ch );
366 }
void(* parse)(struct gdbstub *stub, char ch)
Definition: gdbstub.c:53
uint8_t ch
Definition: registers.h:83
static struct gdbstub stub
Definition: gdbstub.c:368

References ch, gdbstub::parse, and stub.

Referenced by gdbstub_handler().

◆ gdbstub_handler()

void gdbstub_handler ( int  signo,
gdbreg_t regs 
)

Interrupt handler.

@signo POSIX signal number @regs CPU register snapshot

Definition at line 372 of file gdbstub.c.

372  {
373  char packet [ SIZEOF_PAYLOAD + 4 ];
374  size_t len, i;
375 
376  /* A transport must be set up */
377  if ( !stub.trans ) {
378  return;
379  }
380 
381  stub.signo = signo;
382  stub.regs = regs;
383  stub.exit_handler = 0;
385  while ( !stub.exit_handler && ( len = stub.trans->recv ( packet, sizeof ( packet ) ) ) > 0 ) {
386  for ( i = 0; i < len; i++ ) {
387  gdbstub_parse ( &stub, packet [ i ] );
388  }
389  }
390 }
static void gdbstub_report_signal(struct gdbstub *stub)
Definition: gdbstub.c:201
int signo
Definition: gdbstub.c:50
int exit_handler
Definition: gdbstub.c:48
struct gdb_transport * trans
Definition: gdbstub.c:47
static struct gdbstub stub
Definition: gdbstub.c:368
gdbreg_t * regs
Definition: gdbstub.c:51
struct i386_regs regs
Definition: registers.h:15
static void gdbstub_parse(struct gdbstub *stub, char ch)
Definition: gdbstub.c:364
uint32_t len
Length.
Definition: ena.h:14
size_t(* recv)(char *buf, size_t len)
Perform a blocking read.
Definition: gdbstub.h:40

References gdbstub::exit_handler, gdbstub_parse(), gdbstub_report_signal(), len, gdb_transport::recv, gdbstub::regs, regs, gdbstub::signo, SIZEOF_PAYLOAD, stub, and gdbstub::trans.

Referenced by gdbmach_handler().

◆ find_gdb_transport()

struct gdb_transport* find_gdb_transport ( const char *  name)

Look up GDB transport by name.

Parameters
nameName of transport
Return values
GDBtransport or NULL

Definition at line 392 of file gdbstub.c.

392  {
393  struct gdb_transport *trans;
394 
396  if ( strcmp ( trans->name, name ) == 0 ) {
397  return trans;
398  }
399  }
400  return NULL;
401 }
const char * name
Definition: ath9k_hw.c:1984
const char * name
Transport name.
Definition: gdbstub.h:22
#define for_each_table_entry(pointer, table)
Iterate through all entries within a linker table.
Definition: tables.h:358
int strcmp(const char *first, const char *second)
Compare strings.
Definition: string.c:157
#define GDB_TRANSPORTS
Definition: gdbstub.h:50
#define NULL
NULL pointer (VOID *)
Definition: Base.h:362
A transport mechanism for the GDB protocol.
Definition: gdbstub.h:20

References for_each_table_entry, GDB_TRANSPORTS, gdb_transport::name, name, NULL, and strcmp().

Referenced by parse_gdb_transport().

◆ gdbstub_start()

void gdbstub_start ( struct gdb_transport trans)

Break into the debugger using the given transport.

Parameters
transGDB transport

Definition at line 403 of file gdbstub.c.

403  {
404  stub.trans = trans;
405  stub.payload = &stub.buf [ 1 ];
406  gdbmach_init();
408 }
static void gdbmach_breakpoint(void)
Definition: gdbmach.h:64
void gdbmach_init(void)
Initialise GDB.
Definition: gdbmach.c:242
char * payload
Definition: gdbstub.c:60
char buf[SIZEOF_PAYLOAD+4]
Definition: gdbstub.c:59
struct gdb_transport * trans
Definition: gdbstub.c:47
static struct gdbstub stub
Definition: gdbstub.c:368

References gdbstub::buf, gdbmach_breakpoint(), gdbmach_init(), gdbstub::payload, stub, and gdbstub::trans.

Referenced by gdbstub_exec().

Variable Documentation

◆ stub

struct gdbstub stub
static