1 | /*===============================================================*\ |
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2 | | Project: RTEMS remote gdb over serial line | |
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3 | +-----------------------------------------------------------------+ |
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4 | | File: serdbg.c | |
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5 | +-----------------------------------------------------------------+ |
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6 | | Copyright (c) 2002 IMD | |
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7 | | Ingenieurbuero fuer Microcomputertechnik Th. Doerfler | |
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8 | | <Thomas.Doerfler@imd-systems.de> | |
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9 | | all rights reserved | |
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10 | +-----------------------------------------------------------------+ |
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11 | | this file contains intialization and utility functions to add | |
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12 | | a gdb remote debug stub to an RTEMS system | |
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13 | | | |
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14 | +-----------------------------------------------------------------+ |
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15 | | date history ID | |
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16 | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
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17 | | 04.04.02 creation doe | |
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18 | \*===============================================================*/ |
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19 | /* |
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20 | * $Id$ |
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21 | */ |
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22 | #include <rtems.h> |
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23 | #include <stdio.h> |
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24 | #include <string.h> |
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25 | #include <fcntl.h> |
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26 | #include <errno.h> |
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27 | #include <serdbg.h> |
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28 | |
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29 | |
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30 | /*=========================================================================*\ |
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31 | | Function: | |
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32 | \*-------------------------------------------------------------------------*/ |
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33 | int serdbg_init_dbg |
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34 | ( |
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35 | /*-------------------------------------------------------------------------*\ |
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36 | | Purpose: | |
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37 | | initialize remote gdb session over serial line | |
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38 | +---------------------------------------------------------------------------+ |
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39 | | Input Parameters: | |
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40 | \*-------------------------------------------------------------------------*/ |
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41 | void |
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42 | ) |
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43 | /*-------------------------------------------------------------------------*\ |
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44 | | Return Value: | |
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45 | | rtems_status_code | |
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46 | \*=========================================================================*/ |
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47 | { |
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48 | static boolean is_initialized = FALSE; |
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49 | |
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50 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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51 | extern void set_debug_traps(void); |
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52 | extern void breakpoint(void); |
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53 | |
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54 | if (is_initialized) { |
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55 | return RTEMS_SUCCESSFUL; |
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56 | } |
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57 | is_initialized = TRUE; |
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58 | /* |
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59 | * try to open serial device |
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60 | */ |
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61 | if (rc == RTEMS_SUCCESSFUL) { |
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62 | if ((serdbg_conf.open_io != NULL) && |
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63 | (0 > serdbg_conf.open_io(serdbg_conf.devname,serdbg_conf.baudrate))) { |
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64 | fprintf(stderr, |
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65 | "remote_gdb_init: cannot open device %s " |
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66 | "for gdb connection:%s\n",serdbg_conf.devname,strerror(errno)); |
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67 | rc = RTEMS_IO_ERROR; |
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68 | } |
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69 | } |
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70 | /* |
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71 | * initialize gdb stub |
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72 | */ |
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73 | if (rc == RTEMS_SUCCESSFUL) { |
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74 | set_debug_traps(); |
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75 | } |
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76 | /* |
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77 | * now activate gdb stub |
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78 | */ |
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79 | if ((rc == RTEMS_SUCCESSFUL) && |
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80 | !serdbg_conf.skip_init_bkpt) { |
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81 | breakpoint(); |
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82 | } |
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83 | |
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84 | /* |
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85 | * return to original function |
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86 | * this may be already unter gdb control |
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87 | */ |
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88 | return rc; |
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89 | } |
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90 | |
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