1 | /* |
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2 | * |
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3 | * Support for gnat/rtems interrupts and exception handling. |
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4 | * Jiri Gaisler, ESA/ESTEC, 17-02-1999. |
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5 | * |
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6 | */ |
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7 | |
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8 | #include <unistd.h> /* getpid */ |
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9 | |
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10 | #include <bsp.h> |
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11 | #include <rtems/bspIo.h> |
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12 | #include <signal.h> |
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13 | #include <stdlib.h> |
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14 | #include <bsp/gnatcommon.h> |
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15 | |
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16 | /* |
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17 | * Synchronous trap handler. Map the trap number of SIGFPE, SIGSEGV |
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18 | * or SIGILL to generate the corresponding Ada exception. |
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19 | */ |
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20 | static rtems_isr |
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21 | __gnat_exception_handler(rtems_vector_number trap) |
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22 | { |
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23 | uint32_t real_trap; |
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24 | uint32_t signal; |
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25 | |
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26 | real_trap = SPARC_REAL_TRAP_NUMBER (trap); |
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27 | switch (real_trap) |
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28 | { |
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29 | case 0x08: /* FPU exception */ |
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30 | case 0x0A: /* TAG overflow */ |
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31 | case 0x82: /* divide by zero */ |
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32 | signal = SIGFPE; /* Will cause Constraint_Error */ |
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33 | break; |
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34 | case 0x01: /* Instruction access exception */ |
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35 | case 0x09: /* Data access exception */ |
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36 | signal = SIGSEGV; /* Will cause Storage_Error */ |
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37 | break; |
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38 | default: /* Anything else ... */ |
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39 | signal = SIGILL; /* Will cause Program_Error */ |
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40 | break; |
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41 | } |
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42 | kill (getpid (), signal); |
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43 | } |
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44 | |
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45 | /* |
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46 | * Asynchronous trap handler. As it happens, the interrupt trap numbers for |
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47 | * SPARC is 17 - 31, so we just map then directly on the same signal number. |
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48 | */ |
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49 | static rtems_isr |
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50 | __gnat_interrupt_handler (rtems_vector_number trap) |
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51 | { |
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52 | uint32_t real_trap; |
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53 | |
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54 | real_trap = SPARC_REAL_TRAP_NUMBER (trap); |
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55 | |
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56 | kill (getpid (), real_trap); |
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57 | |
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58 | } |
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59 | |
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60 | /* |
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61 | * Default signal handler with error reporting |
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62 | */ |
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63 | |
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64 | static void |
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65 | __gnat_signals_Abnormal_termination_handler (int signo) |
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66 | { |
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67 | switch (signo) |
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68 | { |
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69 | case SIGFPE: |
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70 | printk("\nConstraint_Error\n"); |
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71 | break; |
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72 | case SIGSEGV: |
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73 | printk("\nStorage_Error\n"); |
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74 | break; |
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75 | default: |
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76 | printk("\nProgram_Error\n"); |
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77 | break; |
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78 | } |
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79 | exit (1); |
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80 | } |
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81 | |
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82 | const struct sigaction __gnat_error_vector = |
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83 | {0, -1, |
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84 | {__gnat_signals_Abnormal_termination_handler}}; |
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85 | |
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86 | void |
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87 | __gnat_install_handler_common (int t1, int t2) |
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88 | { |
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89 | uint32_t trap; |
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90 | rtems_isr_entry previous_isr; |
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91 | |
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92 | sigaction (SIGSEGV, &__gnat_error_vector, NULL); |
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93 | sigaction (SIGFPE, &__gnat_error_vector, NULL); |
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94 | sigaction (SIGILL, &__gnat_error_vector, NULL); |
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95 | |
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96 | for (trap = 0; trap < 256; trap++) |
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97 | { |
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98 | |
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99 | /* |
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100 | * Skip window overflow, underflow, and flush as well as software |
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101 | * trap 0 which we will use as a shutdown. Also avoid trap 0x70 - 0x7f |
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102 | * which cannot happen and where some of the space is used to pass |
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103 | * paramaters to the program. 0x80 for system traps and |
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104 | * 0x81 - 0x83 by the remote debugging stub. |
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105 | * Avoid two bsp specific interrupts which normally are used |
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106 | * by the real-time clock and UART B. |
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107 | */ |
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108 | |
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109 | if ((trap >= 0x11) && (trap <= 0x1f)) |
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110 | { |
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111 | if ((trap != t1) && (trap != t2)) |
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112 | rtems_interrupt_catch (__gnat_interrupt_handler, trap, &previous_isr); |
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113 | } |
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114 | else if ((trap != 5 && trap != 6) && ((trap < 0x70) || (trap > 0x83))) |
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115 | set_vector (__gnat_exception_handler, SPARC_SYNCHRONOUS_TRAP (trap), 1); |
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116 | } |
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117 | } |
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