1 | /*****************************************************************************/ |
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2 | /* |
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3 | $Id$ |
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4 | |
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5 | Hooks for GDB |
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6 | |
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7 | */ |
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8 | /*****************************************************************************/ |
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9 | |
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10 | |
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11 | #include <bsp.h> |
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12 | #include <m68302.h> |
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13 | #include <m68302scc.h> |
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14 | |
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15 | static int initialised = 0; |
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16 | |
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17 | void putDebugChar(char ch) |
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18 | { |
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19 | if (!initialised) |
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20 | { |
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21 | scc_initialise(DEBUG_PORT, DEBUG_BAUD, 0); |
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22 | initialised = 1; |
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23 | } |
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24 | |
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25 | scc_out(DEBUG_PORT, ch); |
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26 | } |
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27 | |
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28 | char getDebugChar(void) |
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29 | { |
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30 | if (!initialised) |
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31 | { |
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32 | scc_initialise(DEBUG_PORT, DEBUG_BAUD, 0); |
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33 | initialised = 1; |
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34 | } |
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35 | |
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36 | while (!scc_status(DEBUG_PORT, 0)); |
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37 | |
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38 | return scc_in(DEBUG_PORT); |
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39 | } |
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40 | |
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41 | /* |
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42 | * Need to create yet another jump table for gdb this time |
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43 | */ |
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44 | |
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45 | void (*exceptionHook)(unsigned int) = 0; |
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46 | |
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47 | typedef struct { |
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48 | rtems_unsigned16 move_a7; /* move #FORMAT_ID,%a7@- */ |
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49 | rtems_unsigned16 format_id; |
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50 | rtems_unsigned16 jmp; /* jmp _ISR_Handlers */ |
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51 | rtems_unsigned32 isr_handler; |
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52 | } GDB_HANDLER_ENTRY; |
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53 | |
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54 | #if !defined(M68K_MOVE_A7) |
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55 | #define M68K_MOVE_A7 0x3F3C |
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56 | #endif |
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57 | |
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58 | #if !defined(M68K_JMP) |
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59 | #define M68K_JMP 0x4EF9 |
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60 | #endif |
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61 | |
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62 | /* points to jsr-exception-table in targets wo/ VBR register */ |
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63 | static GDB_HANDLER_ENTRY gdb_jump_table[256]; |
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64 | |
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65 | void exceptionHandler(unsigned int vector, void *handler) |
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66 | { |
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67 | rtems_unsigned32 *interrupt_table = 0; |
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68 | |
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69 | gdb_jump_table[vector].move_a7 = M68K_MOVE_A7; |
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70 | gdb_jump_table[vector].format_id = vector; |
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71 | gdb_jump_table[vector].jmp = M68K_JMP; |
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72 | gdb_jump_table[vector].isr_handler = (rtems_unsigned32) handler; |
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73 | |
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74 | interrupt_table[vector] = (rtems_unsigned32) &gdb_jump_table[vector]; |
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75 | } |
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76 | |
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