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[/] [openrisc/] [tags/] [gnu-src/] [gdb-7.2/] [gdb-7.2-or32-1.0rc1/] [sim/] [cris/] [dv-cris.c] - Rev 341
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/* The CRIS interrupt framework for GDB, the GNU Debugger. Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. This file is part of GDB. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "sim-main.h" #include "hw-main.h" /* DEVICE CRIS cpu virtual device (very rudimental; generic enough for all currently used CRIS versions). DESCRIPTION Implements the external CRIS functionality. This includes the delivery of interrupts generated from other devices. PROPERTIES vec-for-int = <int-a> <vec-a> <int-b> <vec-b> ... These are the translations to interrupt vector for values appearing on the "int" port, as pairs of the value and the corresponding vector. Defaults to no translation. All values that may appear on the "int" port must be defined, or the device aborts. multiple-int = ("abort" | "ignore_previous" | <vector>) If multiple interrupt values are dispatched, this property decides what to do. The value is either a number corresponding to the vector to use, or the string "abort" to cause a hard abort, or the string "ignore_previous", to silently use the new vector instead. The default is "abort". PORTS int (input) Interrupt port. An event with a non-zero value on this port causes an interrupt. If, after an event but before the interrupt has been properly dispatched, a non-zero value appears that is different after mapping than the previous, then the property multiple_int decides what to do. FIXME: reg port so internal registers can be read. Requires chip-specific versions, though. Ports "nmi" and "reset". BUGS When delivering an interrupt, this code assumes that there is only one processor (number 0). This code does not attempt to be efficient at handling pending interrupts. It simply schedules the interrupt delivery handler every instruction cycle until all pending interrupts go away. It also works around a bug in sim_events_process when doing so. */ /* Keep this an enum for simple addition of "reset" and "nmi". */ enum { INT_PORT, }; static const struct hw_port_descriptor cris_ports[] = { { "int", INT_PORT, 0, input_port }, { NULL, 0, 0, 0 } }; struct cris_vec_tr { unsigned32 portval, vec; }; enum cris_multiple_ints { cris_multint_abort, cris_multint_ignore_previous, cris_multint_vector }; struct cris_hw { struct hw_event *pending_handler; unsigned32 pending_vector; struct cris_vec_tr *int_to_vec; enum cris_multiple_ints multi_int_action; unsigned32 multiple_int_vector; }; /* An event function, calling the actual CPU-model-specific interrupt-delivery function. */ static void deliver_cris_interrupt (struct hw *me, void *data) { struct cris_hw *crishw = hw_data (me); SIM_DESC simulator = hw_system (me); sim_cpu *cpu = STATE_CPU (simulator, 0); unsigned int intno = crishw->pending_vector; if (CPU_CRIS_DELIVER_INTERRUPT (cpu) (cpu, CRIS_INT_INT, intno)) { crishw->pending_vector = 0; crishw->pending_handler = NULL; return; } { /* Bug workaround: at time T with a pending number of cycles N to process, if re-scheduling an event at time T+M, M < N, sim_events_process gets stuck at T (updating the "time" to before the event rather than after the event, or somesuch). Hacking this locally is thankfully easy: if we see the same simulation time, increase the number of cycles. Do this every time we get here, until a new time is seen (supposedly unstuck re-delivery). (Fixing in SIM/GDB source will hopefully then also be easier, having a tangible test-case.) */ static signed64 last_events_time = 0; static signed64 delta = 1; signed64 this_events_time = hw_event_queue_time (me); if (this_events_time == last_events_time) delta++; else { delta = 1; last_events_time = this_events_time; } crishw->pending_handler = hw_event_queue_schedule (me, delta, deliver_cris_interrupt, NULL); } } /* A port-event function for events arriving to an interrupt port. */ static void cris_port_event (struct hw *me, int my_port, struct hw *source, int source_port, int intparam) { struct cris_hw *crishw = hw_data (me); unsigned32 vec; /* A few placeholders; only the INT port is implemented. */ switch (my_port) { case INT_PORT: HW_TRACE ((me, "INT value=0x%x", intparam)); break; default: hw_abort (me, "bad switch"); break; } if (intparam == 0) return; if (crishw->int_to_vec != NULL) { unsigned int i; for (i = 0; crishw->int_to_vec[i].portval != 0; i++) if (crishw->int_to_vec[i].portval == intparam) break; if (crishw->int_to_vec[i].portval == 0) hw_abort (me, "unsupported value for int port: 0x%x", intparam); vec = crishw->int_to_vec[i].vec; } else vec = (unsigned32) intparam; if (crishw->pending_vector != 0) { if (vec == crishw->pending_vector) return; switch (crishw->multi_int_action) { case cris_multint_abort: hw_abort (me, "int 0x%x (0x%x) while int 0x%x hasn't been delivered", vec, intparam, crishw->pending_vector); break; case cris_multint_ignore_previous: break; case cris_multint_vector: vec = crishw->multiple_int_vector; break; default: hw_abort (me, "bad switch"); } } crishw->pending_vector = vec; /* Schedule our event handler *now*. */ if (crishw->pending_handler == NULL) crishw->pending_handler = hw_event_queue_schedule (me, 0, deliver_cris_interrupt, NULL); } /* Instance initializer function. */ static void cris_finish (struct hw *me) { struct cris_hw *crishw; const struct hw_property *vec_for_int; const struct hw_property *multiple_int; crishw = HW_ZALLOC (me, struct cris_hw); set_hw_data (me, crishw); set_hw_ports (me, cris_ports); set_hw_port_event (me, cris_port_event); vec_for_int = hw_find_property (me, "vec-for-int"); if (vec_for_int != NULL) { unsigned32 vecsize; unsigned32 i; if (hw_property_type (vec_for_int) != array_property) hw_abort (me, "property \"vec-for-int\" has the wrong type"); vecsize = hw_property_sizeof_array (vec_for_int) / sizeof (signed_cell); if ((vecsize % 2) != 0) hw_abort (me, "translation vector does not consist of even pairs"); crishw->int_to_vec = hw_malloc (me, (vecsize/2 + 1) * sizeof (crishw->int_to_vec[0])); for (i = 0; i < vecsize/2; i++) { signed_cell portval_sc; signed_cell vec_sc; if (!hw_find_integer_array_property (me, "vec-for-int", i*2, &portval_sc) || !hw_find_integer_array_property (me, "vec-for-int", i*2 + 1, &vec_sc) || portval_sc < 0 || vec_sc < 0) hw_abort (me, "no valid vector translation pair %u", i); crishw->int_to_vec[i].portval = (unsigned32) portval_sc; crishw->int_to_vec[i].vec = (unsigned32) vec_sc; } crishw->int_to_vec[i].portval = 0; crishw->int_to_vec[i].vec = 0; } multiple_int = hw_find_property (me, "multiple-int"); if (multiple_int != NULL) { if (hw_property_type (multiple_int) == integer_property) { crishw->multiple_int_vector = hw_find_integer_property (me, "multiple-int"); crishw->multi_int_action = cris_multint_vector; } else { const char *action = hw_find_string_property (me, "multiple-int"); if (action == NULL) hw_abort (me, "property \"multiple-int\" has the wrong type"); if (strcmp (action, "abort") == 0) crishw->multi_int_action = cris_multint_abort; else if (strcmp (action, "ignore_previous") == 0) crishw->multi_int_action = cris_multint_ignore_previous; else hw_abort (me, "property \"multiple-int\" must be one of <vector number>\n" "\"abort\" and \"ignore_previous\", not \"%s\"", action); } } else crishw->multi_int_action = cris_multint_abort; } const struct hw_descriptor dv_cris_descriptor[] = { { "cris", cris_finish, }, { NULL }, };