[e069cdc3] | 1 | /* |
---|
| 2 | * |
---|
| 3 | * Support for gnat/rtems machine error exception handling. |
---|
| 4 | * Jiri Gaisler, ESA/ESTEC, 17-02-1999. |
---|
| 5 | * |
---|
| 6 | */ |
---|
| 7 | |
---|
| 8 | #include <bsp.h> |
---|
| 9 | #include <signal.h> |
---|
| 10 | |
---|
| 11 | /* |
---|
| 12 | * Synchronous trap handler. Map the trap number of SIGFPE, SIGSEGV |
---|
| 13 | * or SIGILL to generate the corresponding Ada exception. |
---|
| 14 | */ |
---|
| 15 | |
---|
| 16 | rtems_isr __gnat_exception_handler |
---|
| 17 | ( rtems_vector_number trap) |
---|
| 18 | { |
---|
| 19 | rtems_unsigned32 real_trap; |
---|
| 20 | rtems_unsigned32 signal; |
---|
| 21 | |
---|
| 22 | real_trap = SPARC_REAL_TRAP_NUMBER(trap); |
---|
| 23 | switch (real_trap) { |
---|
| 24 | case 0x08: /* FPU exception */ |
---|
| 25 | case 0x0A: /* TAG overflow */ |
---|
| 26 | case 0x82: /* divide by zero */ |
---|
| 27 | signal = SIGFPE; /* Will cause Constraint_Error */ |
---|
| 28 | break; |
---|
| 29 | case 0x01: /* Instruction access exception */ |
---|
| 30 | case 0x09: /* Data access exception */ |
---|
| 31 | signal = SIGSEGV; /* Will cause Storage_Error */ |
---|
| 32 | break; |
---|
| 33 | default: /* Anything else ... */ |
---|
| 34 | signal = SIGILL; /* Will cause Program_Error */ |
---|
| 35 | break; |
---|
| 36 | } |
---|
| 37 | kill(getpid(),signal); |
---|
| 38 | } |
---|
| 39 | |
---|
| 40 | /* |
---|
| 41 | * Asynchronous trap handler. As it happens, the interrupt trap numbers for |
---|
| 42 | * SPARC is 17 - 31, so we just map then directly on the same signal. |
---|
| 43 | */ |
---|
| 44 | |
---|
| 45 | rtems_isr __gnat_interrupt_handler |
---|
| 46 | ( rtems_vector_number trap) |
---|
| 47 | { |
---|
| 48 | rtems_unsigned32 real_trap; |
---|
| 49 | |
---|
| 50 | real_trap = SPARC_REAL_TRAP_NUMBER(trap); |
---|
| 51 | |
---|
| 52 | kill(getpid(),real_trap); |
---|
| 53 | |
---|
| 54 | } |
---|
| 55 | |
---|
| 56 | /* |
---|
| 57 | * Default signal handler with error reporting |
---|
| 58 | */ |
---|
| 59 | |
---|
| 60 | void __gnat_signals_Abormal_termination_handler( int signo ) |
---|
| 61 | { |
---|
| 62 | switch ( signo ) { |
---|
| 63 | case SIGFPE: |
---|
| 64 | DEBUG_puts("\nConstraint_Error\n"); |
---|
| 65 | break; |
---|
| 66 | case SIGSEGV: |
---|
| 67 | DEBUG_puts("\nStorage_Error\n"); |
---|
| 68 | break; |
---|
| 69 | default: |
---|
| 70 | DEBUG_puts("\nProgram_Error\n"); |
---|
| 71 | break; |
---|
| 72 | } |
---|
| 73 | exit( 1 ); |
---|
| 74 | } |
---|
| 75 | |
---|
| 76 | const struct sigaction __gnat_error_vector = { |
---|
| 77 | 0, -1, {__gnat_signals_Abormal_termination_handler}}; |
---|
| 78 | |
---|
| 79 | void __gnat_install_handler() |
---|
| 80 | { |
---|
| 81 | rtems_unsigned32 trap; |
---|
| 82 | rtems_isr_entry previous_isr; |
---|
| 83 | |
---|
| 84 | sigaction(SIGSEGV, &__gnat_error_vector, NULL); |
---|
| 85 | sigaction(SIGFPE , &__gnat_error_vector, NULL); |
---|
| 86 | sigaction(SIGILL , &__gnat_error_vector, NULL); |
---|
| 87 | |
---|
| 88 | for ( trap=0 ; trap<256 ; trap++ ) { |
---|
| 89 | |
---|
| 90 | /* |
---|
| 91 | * Skip window overflow, underflow, and flush as well as software |
---|
| 92 | * trap 0 which we will use as a shutdown. Also avoid trap 0x70 - 0x7f |
---|
| 93 | * which cannot happen and where some of the space is used to pass |
---|
| 94 | * paramaters to the program. Trap 0x1d is used by the clock tick |
---|
[4e556493] | 95 | * and 0x83 by the remote debugging stub. Traps 0x14, 0x15, and 0x17 |
---|
| 96 | * are used by the console device driver. |
---|
[e069cdc3] | 97 | */ |
---|
| 98 | |
---|
| 99 | if (( trap >= 0x11 ) && ( trap <= 0x1f )) { |
---|
[4e556493] | 100 | if ( trap != 0x1d && trap != 0x14 && trap != 0x15 && trap != 0x17 ) |
---|
[e069cdc3] | 101 | rtems_interrupt_catch( __gnat_interrupt_handler, |
---|
| 102 | trap, &previous_isr ); |
---|
| 103 | } else if (( trap != 5 && trap != 6 && trap != 0x83 ) && |
---|
| 104 | (( trap < 0x70 ) || ( trap > 0x80 ))) |
---|
| 105 | set_vector( __gnat_exception_handler, |
---|
| 106 | SPARC_SYNCHRONOUS_TRAP( trap ), 1 ); |
---|
| 107 | } |
---|
| 108 | } |
---|