[3eec211] | 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 <bsp.h> |
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| 9 | #include <signal.h> |
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| 10 | |
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| 11 | /* |
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| 12 | * Synchronous trap handler. Map the trap number of SIGFPE, SIGSEGV |
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| 13 | * or SIGILL to generate the corresponding Ada exception. |
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| 14 | */ |
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| 15 | |
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| 16 | rtems_isr __gnat_exception_handler |
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| 17 | (rtems_vector_number trap) |
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| 18 | { |
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| 19 | rtems_unsigned32 real_trap; |
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| 20 | rtems_unsigned32 signal; |
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| 21 | |
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| 22 | real_trap = SPARC_REAL_TRAP_NUMBER (trap); |
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| 23 | switch (real_trap) |
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| 24 | { |
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| 25 | case 0x08: /* FPU exception */ |
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| 26 | case 0x0A: /* TAG overflow */ |
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| 27 | case 0x82: /* divide by zero */ |
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| 28 | signal = SIGFPE; /* Will cause Constraint_Error */ |
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| 29 | break; |
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| 30 | case 0x01: /* Instruction access exception */ |
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| 31 | case 0x09: /* Data access exception */ |
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| 32 | signal = SIGSEGV; /* Will cause Storage_Error */ |
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| 33 | break; |
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| 34 | default: /* Anything else ... */ |
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| 35 | signal = SIGILL; /* Will cause Program_Error */ |
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| 36 | break; |
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| 37 | } |
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| 38 | kill (getpid (), signal); |
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| 39 | } |
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| 40 | |
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| 41 | /* |
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| 42 | * Asynchronous trap handler. As it happens, the interrupt trap numbers for |
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| 43 | * SPARC is 17 - 31, so we just map then directly on the same signal number. |
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| 44 | */ |
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| 45 | |
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| 46 | rtems_isr __gnat_interrupt_handler |
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| 47 | (rtems_vector_number trap) |
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| 48 | { |
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| 49 | rtems_unsigned32 real_trap; |
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| 50 | |
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| 51 | real_trap = SPARC_REAL_TRAP_NUMBER (trap); |
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| 52 | |
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| 53 | kill (getpid (), real_trap); |
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| 54 | |
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| 55 | } |
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| 56 | |
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| 57 | /* |
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| 58 | * Default signal handler with error reporting |
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| 59 | */ |
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| 60 | |
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| 61 | void |
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| 62 | __gnat_signals_Abnormal_termination_handler (int signo) |
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| 63 | { |
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| 64 | switch (signo) |
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| 65 | { |
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| 66 | case SIGFPE: |
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| 67 | DEBUG_puts ("\nConstraint_Error\n"); |
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| 68 | break; |
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| 69 | case SIGSEGV: |
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| 70 | DEBUG_puts ("\nStorage_Error\n"); |
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| 71 | break; |
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| 72 | default: |
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| 73 | DEBUG_puts ("\nProgram_Error\n"); |
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| 74 | break; |
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| 75 | } |
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| 76 | exit (1); |
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| 77 | } |
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| 78 | |
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| 79 | const struct sigaction __gnat_error_vector = |
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| 80 | {0, -1, |
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| 81 | {__gnat_signals_Abnormal_termination_handler}}; |
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| 82 | |
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| 83 | void |
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| 84 | __gnat_install_handler_common (int t1, int t2) |
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| 85 | { |
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| 86 | rtems_unsigned32 trap; |
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| 87 | rtems_isr_entry previous_isr; |
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| 88 | |
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| 89 | sigaction (SIGSEGV, &__gnat_error_vector, NULL); |
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| 90 | sigaction (SIGFPE, &__gnat_error_vector, NULL); |
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| 91 | sigaction (SIGILL, &__gnat_error_vector, NULL); |
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| 92 | |
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| 93 | for (trap = 0; trap < 256; trap++) |
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| 94 | { |
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| 95 | |
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| 96 | /* |
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| 97 | * Skip window overflow, underflow, and flush as well as software |
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| 98 | * trap 0 which we will use as a shutdown. Also avoid trap 0x70 - 0x7f |
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| 99 | * which cannot happen and where some of the space is used to pass |
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| 100 | * paramaters to the program. 0x80 for system traps and |
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| 101 | * 0x81 - 0x83 by the remote debugging stub. |
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| 102 | * Avoid two bsp specific interrupts which normally are used |
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| 103 | * by the real-time clock and UART B. |
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| 104 | */ |
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| 105 | |
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| 106 | if ((trap >= 0x11) && (trap <= 0x1f)) |
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| 107 | { |
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| 108 | if ((trap != t1) && (trap != t2)) |
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| 109 | rtems_interrupt_catch (__gnat_interrupt_handler, trap, &previous_isr); |
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| 110 | } |
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| 111 | else if ((trap != 5 && trap != 6) && ((trap < 0x70) || (trap > 0x83))) |
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| 112 | set_vector (__gnat_exception_handler, SPARC_SYNCHRONOUS_TRAP (trap), 1); |
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| 113 | } |
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| 114 | } |
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