2 /* Simulator for the MIPS architecture.
4 This file is part of the MIPS sim
6 THIS SOFTWARE IS NOT COPYRIGHTED
8 Cygnus offers the following for use in the public domain. Cygnus
9 makes no warranty with regard to the software or it's performance
10 and the user accepts the software "AS IS" with all faults.
12 CYGNUS DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WITH REGARD TO
13 THIS SOFTWARE INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
14 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
18 The IDT monitor (found on the VR4300 board), seems to lie about
19 register contents. It seems to treat the registers as sign-extended
20 32-bit values. This cause *REAL* problems when single-stepping 64-bit
28 #include "sim-utils.h"
29 #include "sim-options.h"
30 #include "sim-assert.h"
56 #include "libiberty.h"
58 #include "gdb/callback.h" /* GDB simulator callback interface */
59 #include "gdb/remote-sim.h" /* GDB simulator interface */
61 char* pr_addr (SIM_ADDR addr);
62 char* pr_uword64 (uword64 addr);
65 /* Within interp.c we refer to the sim_state and sim_cpu directly. */
70 /* The following reserved instruction value is used when a simulator
71 trap is required. NOTE: Care must be taken, since this value may be
72 used in later revisions of the MIPS ISA. */
74 #define RSVD_INSTRUCTION (0x00000039)
75 #define RSVD_INSTRUCTION_MASK (0xFC00003F)
77 #define RSVD_INSTRUCTION_ARG_SHIFT 6
78 #define RSVD_INSTRUCTION_ARG_MASK 0xFFFFF
81 /* Bits in the Debug register */
82 #define Debug_DBD 0x80000000 /* Debug Branch Delay */
83 #define Debug_DM 0x40000000 /* Debug Mode */
84 #define Debug_DBp 0x00000002 /* Debug Breakpoint indicator */
86 /*---------------------------------------------------------------------------*/
87 /*-- GDB simulator interface ------------------------------------------------*/
88 /*---------------------------------------------------------------------------*/
90 static void ColdReset (SIM_DESC sd);
92 /*---------------------------------------------------------------------------*/
96 #define DELAYSLOT() {\
97 if (STATE & simDELAYSLOT)\
98 sim_io_eprintf(sd,"Delay slot already activated (branch in delay slot?)\n");\
99 STATE |= simDELAYSLOT;\
102 #define JALDELAYSLOT() {\
104 STATE |= simJALDELAYSLOT;\
108 STATE &= ~simDELAYSLOT;\
109 STATE |= simSKIPNEXT;\
112 #define CANCELDELAYSLOT() {\
114 STATE &= ~(simDELAYSLOT | simJALDELAYSLOT);\
117 #define INDELAYSLOT() ((STATE & simDELAYSLOT) != 0)
118 #define INJALDELAYSLOT() ((STATE & simJALDELAYSLOT) != 0)
120 /* Note that the monitor code essentially assumes this layout of memory.
121 If you change these, change the monitor code, too. */
122 /* FIXME Currently addresses are truncated to 32-bits, see
123 mips/sim-main.c:address_translation(). If that changes, then these
124 values will need to be extended, and tested for more carefully. */
125 #define K0BASE (0x80000000)
126 #define K0SIZE (0x20000000)
127 #define K1BASE (0xA0000000)
128 #define K1SIZE (0x20000000)
130 /* Simple run-time monitor support.
132 We emulate the monitor by placing magic reserved instructions at
133 the monitor's entry points; when we hit these instructions, instead
134 of raising an exception (as we would normally), we look at the
135 instruction and perform the appropriate monitory operation.
137 `*_monitor_base' are the physical addresses at which the corresponding
138 monitor vectors are located. `0' means none. By default,
140 The RSVD_INSTRUCTION... macros specify the magic instructions we
141 use at the monitor entry points. */
142 static int firmware_option_p = 0;
143 static SIM_ADDR idt_monitor_base = 0xBFC00000;
144 static SIM_ADDR pmon_monitor_base = 0xBFC00500;
145 static SIM_ADDR lsipmon_monitor_base = 0xBFC00200;
147 static SIM_RC sim_firmware_command (SIM_DESC sd, char* arg);
149 #define MEM_SIZE (8 << 20) /* 8 MBytes */
153 static char *tracefile = "trace.din"; /* default filename for trace log */
154 FILE *tracefh = NULL;
155 static void open_trace (SIM_DESC sd);
157 #define open_trace(sd)
160 static const char * get_insn_name (sim_cpu *, int);
162 /* simulation target board. NULL=canonical */
163 static char* board = NULL;
166 static DECLARE_OPTION_HANDLER (mips_option_handler);
169 OPTION_DINERO_TRACE = OPTION_START,
176 static int display_mem_info = 0;
179 mips_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt, char *arg,
185 case OPTION_DINERO_TRACE: /* ??? */
187 /* Eventually the simTRACE flag could be treated as a toggle, to
188 allow external control of the program points being traced
189 (i.e. only from main onwards, excluding the run-time setup,
191 for (cpu_nr = 0; cpu_nr < MAX_NR_PROCESSORS; cpu_nr++)
193 sim_cpu *cpu = STATE_CPU (sd, cpu_nr);
196 else if (strcmp (arg, "yes") == 0)
198 else if (strcmp (arg, "no") == 0)
200 else if (strcmp (arg, "on") == 0)
202 else if (strcmp (arg, "off") == 0)
206 fprintf (stderr, "Unrecognized dinero-trace option `%s'\n", arg);
211 #else /* !WITH_TRACE_ANY_P */
213 Simulator constructed without dinero tracing support (for performance).\n\
214 Re-compile simulator with \"-DWITH_TRACE_ANY_P\" to enable this option.\n");
216 #endif /* !WITH_TRACE_ANY_P */
218 case OPTION_DINERO_FILE:
220 if (optarg != NULL) {
222 tmp = (char *)malloc(strlen(optarg) + 1);
225 sim_io_printf(sd,"Failed to allocate buffer for tracefile name \"%s\"\n",optarg);
231 sim_io_printf(sd,"Placing trace information into file \"%s\"\n",tracefile);
234 #endif /* WITH_TRACE_ANY_P */
237 case OPTION_FIRMWARE:
238 return sim_firmware_command (sd, arg);
244 board = zalloc(strlen(arg) + 1);
250 case OPTION_INFO_MEMORY:
251 display_mem_info = 1;
259 static const OPTION mips_options[] =
261 { {"dinero-trace", optional_argument, NULL, OPTION_DINERO_TRACE},
262 '\0', "on|off", "Enable dinero tracing",
263 mips_option_handler },
264 { {"dinero-file", required_argument, NULL, OPTION_DINERO_FILE},
265 '\0', "FILE", "Write dinero trace to FILE",
266 mips_option_handler },
267 { {"firmware", required_argument, NULL, OPTION_FIRMWARE},
268 '\0', "[idt|pmon|lsipmon|none][@ADDRESS]", "Emulate ROM monitor",
269 mips_option_handler },
270 { {"board", required_argument, NULL, OPTION_BOARD},
271 '\0', "none" /* rely on compile-time string concatenation for other options */
273 #define BOARD_JMR3904 "jmr3904"
275 #define BOARD_JMR3904_PAL "jmr3904pal"
276 "|" BOARD_JMR3904_PAL
277 #define BOARD_JMR3904_DEBUG "jmr3904debug"
278 "|" BOARD_JMR3904_DEBUG
279 #define BOARD_BSP "bsp"
282 , "Customize simulation for a particular board.", mips_option_handler },
284 /* These next two options have the same names as ones found in the
285 memory_options[] array in common/sim-memopt.c. This is because
286 the intention is to provide an alternative handler for those two
287 options. We need an alternative handler because the memory
288 regions are not set up until after the command line arguments
289 have been parsed, and so we cannot display the memory info whilst
290 processing the command line. There is a hack in sim_open to
291 remove these handlers when we want the real --memory-info option
293 { { "info-memory", no_argument, NULL, OPTION_INFO_MEMORY },
294 '\0', NULL, "List configured memory regions", mips_option_handler },
295 { { "memory-info", no_argument, NULL, OPTION_INFO_MEMORY },
296 '\0', NULL, NULL, mips_option_handler },
298 { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL }
302 int interrupt_pending;
305 interrupt_event (SIM_DESC sd, void *data)
307 sim_cpu *cpu = STATE_CPU (sd, 0); /* FIXME */
308 address_word cia = CPU_PC_GET (cpu);
311 interrupt_pending = 0;
312 SignalExceptionInterrupt (1); /* interrupt "1" */
314 else if (!interrupt_pending)
315 sim_events_schedule (sd, 1, interrupt_event, data);
319 /*---------------------------------------------------------------------------*/
320 /*-- Device registration hook -----------------------------------------------*/
321 /*---------------------------------------------------------------------------*/
322 static void device_init(SIM_DESC sd) {
324 extern void register_devices(SIM_DESC);
325 register_devices(sd);
329 /*---------------------------------------------------------------------------*/
330 /*-- GDB simulator interface ------------------------------------------------*/
331 /*---------------------------------------------------------------------------*/
334 mips_pc_get (sim_cpu *cpu)
340 mips_pc_set (sim_cpu *cpu, sim_cia pc)
345 static int mips_reg_fetch (SIM_CPU *, int, unsigned char *, int);
346 static int mips_reg_store (SIM_CPU *, int, unsigned char *, int);
349 sim_open (SIM_OPEN_KIND kind, host_callback *cb,
350 struct bfd *abfd, char * const *argv)
353 SIM_DESC sd = sim_state_alloc (kind, cb);
356 SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
358 /* The cpu data is kept in a separately allocated chunk of memory. */
359 if (sim_cpu_alloc_all (sd, 1, /*cgen_cpu_max_extra_bytes ()*/0) != SIM_RC_OK)
362 cpu = STATE_CPU (sd, 0); /* FIXME */
364 /* FIXME: watchpoints code shouldn't need this */
365 STATE_WATCHPOINTS (sd)->pc = &(PC);
366 STATE_WATCHPOINTS (sd)->sizeof_pc = sizeof (PC);
367 STATE_WATCHPOINTS (sd)->interrupt_handler = interrupt_event;
369 /* Initialize the mechanism for doing insn profiling. */
370 CPU_INSN_NAME (cpu) = get_insn_name;
371 CPU_MAX_INSNS (cpu) = nr_itable_entries;
375 if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
377 sim_add_option_table (sd, NULL, mips_options);
380 /* The parser will print an error message for us, so we silently return. */
381 if (sim_parse_args (sd, argv) != SIM_RC_OK)
383 /* Uninstall the modules to avoid memory leaks,
384 file descriptor leaks, etc. */
385 sim_module_uninstall (sd);
389 /* handle board-specific memory maps */
392 /* Allocate core managed memory */
393 sim_memopt *entry, *match = NULL;
394 address_word mem_size = 0;
397 /* For compatibility with the old code - under this (at level one)
398 are the kernel spaces K0 & K1. Both of these map to a single
399 smaller sub region */
400 sim_do_command(sd," memory region 0x7fff8000,0x8000") ; /* MTZ- 32 k stack */
402 /* Look for largest memory region defined on command-line at
404 for (entry = STATE_MEMOPT (sd); entry != NULL; entry = entry->next)
406 /* If we find an entry at address 0, then we will end up
407 allocating a new buffer in the "memory alias" command
408 below. The region at address 0 will be deleted. */
409 address_word size = (entry->modulo != 0
410 ? entry->modulo : entry->nr_bytes);
412 && (!match || entry->level < match->level))
414 else if (entry->addr == K0BASE || entry->addr == K1BASE)
419 for (alias = entry->alias; alias != NULL; alias = alias->next)
422 && (!match || entry->level < match->level))
424 else if (alias->addr == K0BASE || alias->addr == K1BASE)
434 /* Get existing memory region size. */
435 mem_size = (match->modulo != 0
436 ? match->modulo : match->nr_bytes);
437 /* Delete old region. */
438 sim_do_commandf (sd, "memory delete %d:0x%lx@%d",
439 match->space, match->addr, match->level);
441 else if (mem_size == 0)
443 /* Limit to KSEG1 size (512MB) */
444 if (mem_size > K1SIZE)
446 /* memory alias K1BASE@1,K1SIZE%MEMSIZE,K0BASE */
447 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx%%0x%lx,0x%0x",
448 K1BASE, K1SIZE, (long)mem_size, K0BASE);
453 else if (board != NULL
454 && (strcmp(board, BOARD_BSP) == 0))
458 STATE_ENVIRONMENT (sd) = OPERATING_ENVIRONMENT;
460 /* ROM: 0x9FC0_0000 - 0x9FFF_FFFF and 0xBFC0_0000 - 0xBFFF_FFFF */
461 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx,0x%0x",
463 4 * 1024 * 1024, /* 4 MB */
466 /* SRAM: 0x8000_0000 - 0x803F_FFFF and 0xA000_0000 - 0xA03F_FFFF */
467 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx,0x%0x",
469 4 * 1024 * 1024, /* 4 MB */
472 /* DRAM: 0x8800_0000 - 0x89FF_FFFF and 0xA800_0000 - 0xA9FF_FFFF */
473 for (i=0; i<8; i++) /* 32 MB total */
475 unsigned size = 4 * 1024 * 1024; /* 4 MB */
476 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx,0x%0x",
477 0x88000000 + (i * size),
479 0xA8000000 + (i * size));
483 else if (board != NULL
484 && (strcmp(board, BOARD_JMR3904) == 0 ||
485 strcmp(board, BOARD_JMR3904_PAL) == 0 ||
486 strcmp(board, BOARD_JMR3904_DEBUG) == 0))
488 /* match VIRTUAL memory layout of JMR-TX3904 board */
491 /* --- disable monitor unless forced on by user --- */
493 if (! firmware_option_p)
495 idt_monitor_base = 0;
496 pmon_monitor_base = 0;
497 lsipmon_monitor_base = 0;
500 /* --- environment --- */
502 STATE_ENVIRONMENT (sd) = OPERATING_ENVIRONMENT;
506 /* ROM: 0x9FC0_0000 - 0x9FFF_FFFF and 0xBFC0_0000 - 0xBFFF_FFFF */
507 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx,0x%0x",
509 4 * 1024 * 1024, /* 4 MB */
512 /* SRAM: 0x8000_0000 - 0x803F_FFFF and 0xA000_0000 - 0xA03F_FFFF */
513 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx,0x%0x",
515 4 * 1024 * 1024, /* 4 MB */
518 /* DRAM: 0x8800_0000 - 0x89FF_FFFF and 0xA800_0000 - 0xA9FF_FFFF */
519 for (i=0; i<8; i++) /* 32 MB total */
521 unsigned size = 4 * 1024 * 1024; /* 4 MB */
522 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx,0x%0x",
523 0x88000000 + (i * size),
525 0xA8000000 + (i * size));
528 /* Dummy memory regions for unsimulated devices - sorted by address */
530 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx", 0xB1000000, 0x400); /* ISA I/O */
531 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx", 0xB2100000, 0x004); /* ISA ctl */
532 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx", 0xB2500000, 0x004); /* LED/switch */
533 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx", 0xB2700000, 0x004); /* RTC */
534 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx", 0xB3C00000, 0x004); /* RTC */
535 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx", 0xFFFF8000, 0x900); /* DRAMC */
536 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx", 0xFFFF9000, 0x200); /* EBIF */
537 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx", 0xFFFFE000, 0x01c); /* EBIF */
538 sim_do_commandf (sd, "memory alias 0x%lx@1,0x%lx", 0xFFFFF500, 0x300); /* PIO */
541 /* --- simulated devices --- */
542 sim_hw_parse (sd, "/tx3904irc@0xffffc000/reg 0xffffc000 0x20");
543 sim_hw_parse (sd, "/tx3904cpu");
544 sim_hw_parse (sd, "/tx3904tmr@0xfffff000/reg 0xfffff000 0x100");
545 sim_hw_parse (sd, "/tx3904tmr@0xfffff100/reg 0xfffff100 0x100");
546 sim_hw_parse (sd, "/tx3904tmr@0xfffff200/reg 0xfffff200 0x100");
547 sim_hw_parse (sd, "/tx3904sio@0xfffff300/reg 0xfffff300 0x100");
549 /* FIXME: poking at dv-sockser internals, use tcp backend if
550 --sockser_addr option was given.*/
551 extern char* sockser_addr;
552 if(sockser_addr == NULL)
553 sim_hw_parse (sd, "/tx3904sio@0xfffff300/backend stdio");
555 sim_hw_parse (sd, "/tx3904sio@0xfffff300/backend tcp");
557 sim_hw_parse (sd, "/tx3904sio@0xfffff400/reg 0xfffff400 0x100");
558 sim_hw_parse (sd, "/tx3904sio@0xfffff400/backend stdio");
560 /* -- device connections --- */
561 sim_hw_parse (sd, "/tx3904irc > ip level /tx3904cpu");
562 sim_hw_parse (sd, "/tx3904tmr@0xfffff000 > int tmr0 /tx3904irc");
563 sim_hw_parse (sd, "/tx3904tmr@0xfffff100 > int tmr1 /tx3904irc");
564 sim_hw_parse (sd, "/tx3904tmr@0xfffff200 > int tmr2 /tx3904irc");
565 sim_hw_parse (sd, "/tx3904sio@0xfffff300 > int sio0 /tx3904irc");
566 sim_hw_parse (sd, "/tx3904sio@0xfffff400 > int sio1 /tx3904irc");
568 /* add PAL timer & I/O module */
569 if(! strcmp(board, BOARD_JMR3904_PAL))
572 sim_hw_parse (sd, "/pal@0xffff0000");
573 sim_hw_parse (sd, "/pal@0xffff0000/reg 0xffff0000 64");
575 /* wire up interrupt ports to irc */
576 sim_hw_parse (sd, "/pal@0x31000000 > countdown tmr0 /tx3904irc");
577 sim_hw_parse (sd, "/pal@0x31000000 > timer tmr1 /tx3904irc");
578 sim_hw_parse (sd, "/pal@0x31000000 > int int0 /tx3904irc");
581 if(! strcmp(board, BOARD_JMR3904_DEBUG))
583 /* -- DEBUG: glue interrupt generators --- */
584 sim_hw_parse (sd, "/glue@0xffff0000/reg 0xffff0000 0x50");
585 sim_hw_parse (sd, "/glue@0xffff0000 > int0 int0 /tx3904irc");
586 sim_hw_parse (sd, "/glue@0xffff0000 > int1 int1 /tx3904irc");
587 sim_hw_parse (sd, "/glue@0xffff0000 > int2 int2 /tx3904irc");
588 sim_hw_parse (sd, "/glue@0xffff0000 > int3 int3 /tx3904irc");
589 sim_hw_parse (sd, "/glue@0xffff0000 > int4 int4 /tx3904irc");
590 sim_hw_parse (sd, "/glue@0xffff0000 > int5 int5 /tx3904irc");
591 sim_hw_parse (sd, "/glue@0xffff0000 > int6 int6 /tx3904irc");
592 sim_hw_parse (sd, "/glue@0xffff0000 > int7 int7 /tx3904irc");
593 sim_hw_parse (sd, "/glue@0xffff0000 > int8 dmac0 /tx3904irc");
594 sim_hw_parse (sd, "/glue@0xffff0000 > int9 dmac1 /tx3904irc");
595 sim_hw_parse (sd, "/glue@0xffff0000 > int10 dmac2 /tx3904irc");
596 sim_hw_parse (sd, "/glue@0xffff0000 > int11 dmac3 /tx3904irc");
597 sim_hw_parse (sd, "/glue@0xffff0000 > int12 sio0 /tx3904irc");
598 sim_hw_parse (sd, "/glue@0xffff0000 > int13 sio1 /tx3904irc");
599 sim_hw_parse (sd, "/glue@0xffff0000 > int14 tmr0 /tx3904irc");
600 sim_hw_parse (sd, "/glue@0xffff0000 > int15 tmr1 /tx3904irc");
601 sim_hw_parse (sd, "/glue@0xffff0000 > int16 tmr2 /tx3904irc");
602 sim_hw_parse (sd, "/glue@0xffff0000 > int17 nmi /tx3904cpu");
609 if (display_mem_info)
611 struct option_list * ol;
612 struct option_list * prev;
614 /* This is a hack. We want to execute the real --memory-info command
615 line switch which is handled in common/sim-memopts.c, not the
616 override we have defined in this file. So we remove the
617 mips_options array from the state options list. This is safe
618 because we have now processed all of the command line. */
619 for (ol = STATE_OPTIONS (sd), prev = NULL;
621 prev = ol, ol = ol->next)
622 if (ol->options == mips_options)
625 SIM_ASSERT (ol != NULL);
628 STATE_OPTIONS (sd) = ol->next;
630 prev->next = ol->next;
632 sim_do_commandf (sd, "memory-info");
635 /* check for/establish the a reference program image */
636 if (sim_analyze_program (sd,
637 (STATE_PROG_ARGV (sd) != NULL
638 ? *STATE_PROG_ARGV (sd)
642 sim_module_uninstall (sd);
646 /* Configure/verify the target byte order and other runtime
647 configuration options */
648 if (sim_config (sd) != SIM_RC_OK)
650 sim_module_uninstall (sd);
654 if (sim_post_argv_init (sd) != SIM_RC_OK)
656 /* Uninstall the modules to avoid memory leaks,
657 file descriptor leaks, etc. */
658 sim_module_uninstall (sd);
662 /* verify assumptions the simulator made about the host type system.
663 This macro does not return if there is a problem */
664 SIM_ASSERT (sizeof(int) == (4 * sizeof(char)));
665 SIM_ASSERT (sizeof(word64) == (8 * sizeof(char)));
667 /* This is NASTY, in that we are assuming the size of specific
671 for (rn = 0; (rn < (LAST_EMBED_REGNUM + 1)); rn++)
674 cpu->register_widths[rn] = WITH_TARGET_WORD_BITSIZE;
675 else if ((rn >= FGR_BASE) && (rn < (FGR_BASE + NR_FGR)))
676 cpu->register_widths[rn] = WITH_TARGET_FLOATING_POINT_BITSIZE;
677 else if ((rn >= 33) && (rn <= 37))
678 cpu->register_widths[rn] = WITH_TARGET_WORD_BITSIZE;
679 else if ((rn == SRIDX)
682 || ((rn >= 72) && (rn <= 89)))
683 cpu->register_widths[rn] = 32;
685 cpu->register_widths[rn] = 0;
691 if (STATE & simTRACE)
695 sim_io_eprintf (sd, "idt@%x pmon@%x lsipmon@%x\n",
698 lsipmon_monitor_base);
701 /* Write the monitor trap address handlers into the monitor (eeprom)
702 address space. This can only be done once the target endianness
703 has been determined. */
704 if (idt_monitor_base != 0)
707 unsigned idt_monitor_size = 1 << 11;
709 /* the default monitor region */
710 sim_do_commandf (sd, "memory region 0x%x,0x%x",
711 idt_monitor_base, idt_monitor_size);
713 /* Entry into the IDT monitor is via fixed address vectors, and
714 not using machine instructions. To avoid clashing with use of
715 the MIPS TRAP system, we place our own (simulator specific)
716 "undefined" instructions into the relevant vector slots. */
717 for (loop = 0; (loop < idt_monitor_size); loop += 4)
719 address_word vaddr = (idt_monitor_base + loop);
720 unsigned32 insn = (RSVD_INSTRUCTION |
721 (((loop >> 2) & RSVD_INSTRUCTION_ARG_MASK)
722 << RSVD_INSTRUCTION_ARG_SHIFT));
724 sim_write (sd, vaddr, (unsigned char *)&insn, sizeof (insn));
728 if ((pmon_monitor_base != 0) || (lsipmon_monitor_base != 0))
730 /* The PMON monitor uses the same address space, but rather than
731 branching into it the address of a routine is loaded. We can
732 cheat for the moment, and direct the PMON routine to IDT style
733 instructions within the monitor space. This relies on the IDT
734 monitor not using the locations from 0xBFC00500 onwards as its
737 for (loop = 0; (loop < 24); loop++)
739 unsigned32 value = ((0x500 - 8) / 8); /* default UNDEFINED reason code */
755 value = ((0x500 - 16) / 8); /* not an IDT reason code */
757 case 8: /* cliexit */
760 case 11: /* flush_cache */
765 SIM_ASSERT (idt_monitor_base != 0);
766 value = ((unsigned int) idt_monitor_base + (value * 8));
769 if (pmon_monitor_base != 0)
771 address_word vaddr = (pmon_monitor_base + (loop * 4));
772 sim_write (sd, vaddr, (unsigned char *)&value, sizeof (value));
775 if (lsipmon_monitor_base != 0)
777 address_word vaddr = (lsipmon_monitor_base + (loop * 4));
778 sim_write (sd, vaddr, (unsigned char *)&value, sizeof (value));
782 /* Write an abort sequence into the TRAP (common) exception vector
783 addresses. This is to catch code executing a TRAP (et.al.)
784 instruction without installing a trap handler. */
785 if ((idt_monitor_base != 0) ||
786 (pmon_monitor_base != 0) ||
787 (lsipmon_monitor_base != 0))
789 unsigned32 halt[2] = { 0x2404002f /* addiu r4, r0, 47 */,
790 HALT_INSTRUCTION /* BREAK */ };
793 sim_write (sd, 0x80000000, (unsigned char *) halt, sizeof (halt));
794 sim_write (sd, 0x80000180, (unsigned char *) halt, sizeof (halt));
795 sim_write (sd, 0x80000200, (unsigned char *) halt, sizeof (halt));
796 /* XXX: Write here unconditionally? */
797 sim_write (sd, 0xBFC00200, (unsigned char *) halt, sizeof (halt));
798 sim_write (sd, 0xBFC00380, (unsigned char *) halt, sizeof (halt));
799 sim_write (sd, 0xBFC00400, (unsigned char *) halt, sizeof (halt));
803 /* CPU specific initialization. */
804 for (i = 0; i < MAX_NR_PROCESSORS; ++i)
806 SIM_CPU *cpu = STATE_CPU (sd, i);
808 CPU_REG_FETCH (cpu) = mips_reg_fetch;
809 CPU_REG_STORE (cpu) = mips_reg_store;
810 CPU_PC_FETCH (cpu) = mips_pc_get;
811 CPU_PC_STORE (cpu) = mips_pc_set;
819 open_trace (SIM_DESC sd)
821 tracefh = fopen(tracefile,"wb+");
824 sim_io_eprintf(sd,"Failed to create file \"%s\", writing trace information to stderr.\n",tracefile);
830 /* Return name of an insn, used by insn profiling. */
832 get_insn_name (sim_cpu *cpu, int i)
834 return itable[i].name;
838 mips_sim_close (SIM_DESC sd, int quitting)
841 if (tracefh != NULL && tracefh != stderr)
848 mips_reg_store (SIM_CPU *cpu, int rn, unsigned char *memory, int length)
850 /* NOTE: gdb (the client) stores registers in target byte order
851 while the simulator uses host byte order */
853 /* Unfortunately this suffers from the same problem as the register
854 numbering one. We need to know what the width of each logical
855 register number is for the architecture being simulated. */
857 if (cpu->register_widths[rn] == 0)
859 sim_io_eprintf (CPU_STATE (cpu), "Invalid register width for %d (register store ignored)\n", rn);
863 if (rn >= FGR_BASE && rn < FGR_BASE + NR_FGR)
865 cpu->fpr_state[rn - FGR_BASE] = fmt_uninterpreted;
866 if (cpu->register_widths[rn] == 32)
870 cpu->fgr[rn - FGR_BASE] =
871 (unsigned32) T2H_8 (*(unsigned64*)memory);
876 cpu->fgr[rn - FGR_BASE] = T2H_4 (*(unsigned32*)memory);
884 cpu->fgr[rn - FGR_BASE] = T2H_8 (*(unsigned64*)memory);
889 cpu->fgr[rn - FGR_BASE] = T2H_4 (*(unsigned32*)memory);
895 if (cpu->register_widths[rn] == 32)
900 (unsigned32) T2H_8 (*(unsigned64*)memory);
905 cpu->registers[rn] = T2H_4 (*(unsigned32*)memory);
913 cpu->registers[rn] = T2H_8 (*(unsigned64*)memory);
918 cpu->registers[rn] = (signed32) T2H_4(*(unsigned32*)memory);
927 mips_reg_fetch (SIM_CPU *cpu, int rn, unsigned char *memory, int length)
929 /* NOTE: gdb (the client) stores registers in target byte order
930 while the simulator uses host byte order */
932 if (cpu->register_widths[rn] == 0)
934 sim_io_eprintf (CPU_STATE (cpu), "Invalid register width for %d (register fetch ignored)\n", rn);
938 /* Any floating point register */
939 if (rn >= FGR_BASE && rn < FGR_BASE + NR_FGR)
941 if (cpu->register_widths[rn] == 32)
945 *(unsigned64*)memory =
946 H2T_8 ((unsigned32) (cpu->fgr[rn - FGR_BASE]));
951 *(unsigned32*)memory = H2T_4 (cpu->fgr[rn - FGR_BASE]);
959 *(unsigned64*)memory = H2T_8 (cpu->fgr[rn - FGR_BASE]);
964 *(unsigned32*)memory = H2T_4 ((unsigned32)(cpu->fgr[rn - FGR_BASE]));
970 if (cpu->register_widths[rn] == 32)
974 *(unsigned64*)memory =
975 H2T_8 ((unsigned32) (cpu->registers[rn]));
980 *(unsigned32*)memory = H2T_4 ((unsigned32)(cpu->registers[rn]));
988 *(unsigned64*)memory =
989 H2T_8 ((unsigned64) (cpu->registers[rn]));
994 *(unsigned32*)memory = H2T_4 ((unsigned32)(cpu->registers[rn]));
1003 sim_create_inferior (SIM_DESC sd, struct bfd *abfd,
1004 char * const *argv, char * const *env)
1008 #if 0 /* FIXME: doesn't compile */
1009 printf("DBG: sim_create_inferior entered: start_address = 0x%s\n",
1018 /* override PC value set by ColdReset () */
1020 for (cpu_nr = 0; cpu_nr < sim_engine_nr_cpus (sd); cpu_nr++)
1022 sim_cpu *cpu = STATE_CPU (sd, cpu_nr);
1023 CPU_PC_SET (cpu, (unsigned64) bfd_get_start_address (abfd));
1027 #if 0 /* def DEBUG */
1030 /* We should really place the argv slot values into the argument
1031 registers, and onto the stack as required. However, this
1032 assumes that we have a stack defined, which is not
1033 necessarily true at the moment. */
1035 sim_io_printf(sd,"sim_create_inferior() : passed arguments ignored\n");
1036 for (cptr = argv; (cptr && *cptr); cptr++)
1037 printf("DBG: arg \"%s\"\n",*cptr);
1044 /*---------------------------------------------------------------------------*/
1045 /*-- Private simulator support interface ------------------------------------*/
1046 /*---------------------------------------------------------------------------*/
1048 /* Read a null terminated string from memory, return in a buffer */
1050 fetch_str (SIM_DESC sd,
1056 while (sim_read (sd, addr + nr, &null, 1) == 1 && null != 0)
1058 buf = NZALLOC (char, nr + 1);
1059 sim_read (sd, addr, (unsigned char *)buf, nr);
1064 /* Implements the "sim firmware" command:
1065 sim firmware NAME[@ADDRESS] --- emulate ROM monitor named NAME.
1066 NAME can be idt, pmon, or lsipmon. If omitted, ADDRESS
1067 defaults to the normal address for that monitor.
1068 sim firmware none --- don't emulate any ROM monitor. Useful
1069 if you need a clean address space. */
1071 sim_firmware_command (SIM_DESC sd, char *arg)
1073 int address_present = 0;
1076 /* Signal occurrence of this option. */
1077 firmware_option_p = 1;
1079 /* Parse out the address, if present. */
1081 char *p = strchr (arg, '@');
1085 address_present = 1;
1086 p ++; /* skip over @ */
1088 address = strtoul (p, &q, 0);
1091 sim_io_printf (sd, "Invalid address given to the"
1092 "`sim firmware NAME@ADDRESS' command: %s\n",
1099 address_present = 0;
1100 address = -1; /* Dummy value. */
1104 if (! strncmp (arg, "idt", 3))
1106 idt_monitor_base = address_present ? address : 0xBFC00000;
1107 pmon_monitor_base = 0;
1108 lsipmon_monitor_base = 0;
1110 else if (! strncmp (arg, "pmon", 4))
1112 /* pmon uses indirect calls. Hook into implied idt. */
1113 pmon_monitor_base = address_present ? address : 0xBFC00500;
1114 idt_monitor_base = pmon_monitor_base - 0x500;
1115 lsipmon_monitor_base = 0;
1117 else if (! strncmp (arg, "lsipmon", 7))
1119 /* lsipmon uses indirect calls. Hook into implied idt. */
1120 pmon_monitor_base = 0;
1121 lsipmon_monitor_base = address_present ? address : 0xBFC00200;
1122 idt_monitor_base = lsipmon_monitor_base - 0x200;
1124 else if (! strncmp (arg, "none", 4))
1126 if (address_present)
1129 "The `sim firmware none' command does "
1130 "not take an `ADDRESS' argument.\n");
1133 idt_monitor_base = 0;
1134 pmon_monitor_base = 0;
1135 lsipmon_monitor_base = 0;
1139 sim_io_printf (sd, "\
1140 Unrecognized name given to the `sim firmware NAME' command: %s\n\
1141 Recognized firmware names are: `idt', `pmon', `lsipmon', and `none'.\n",
1151 /* Simple monitor interface (currently setup for the IDT and PMON monitors) */
1153 sim_monitor (SIM_DESC sd,
1156 unsigned int reason)
1159 printf("DBG: sim_monitor: entered (reason = %d)\n",reason);
1162 /* The IDT monitor actually allows two instructions per vector
1163 slot. However, the simulator currently causes a trap on each
1164 individual instruction. We cheat, and lose the bottom bit. */
1167 /* The following callback functions are available, however the
1168 monitor we are simulating does not make use of them: get_errno,
1169 isatty, lseek, rename, system, time and unlink */
1173 case 6: /* int open(char *path,int flags) */
1175 char *path = fetch_str (sd, A0);
1176 V0 = sim_io_open (sd, path, (int)A1);
1181 case 7: /* int read(int file,char *ptr,int len) */
1185 char *buf = zalloc (nr);
1186 V0 = sim_io_read (sd, fd, buf, nr);
1187 sim_write (sd, A1, (unsigned char *)buf, nr);
1192 case 8: /* int write(int file,char *ptr,int len) */
1196 char *buf = zalloc (nr);
1197 sim_read (sd, A1, (unsigned char *)buf, nr);
1198 V0 = sim_io_write (sd, fd, buf, nr);
1200 sim_io_flush_stdout (sd);
1202 sim_io_flush_stderr (sd);
1207 case 10: /* int close(int file) */
1209 V0 = sim_io_close (sd, (int)A0);
1213 case 2: /* Densan monitor: char inbyte(int waitflag) */
1215 if (A0 == 0) /* waitflag == NOWAIT */
1216 V0 = (unsigned_word)-1;
1218 /* Drop through to case 11 */
1220 case 11: /* char inbyte(void) */
1223 /* ensure that all output has gone... */
1224 sim_io_flush_stdout (sd);
1225 if (sim_io_read_stdin (sd, &tmp, sizeof(char)) != sizeof(char))
1227 sim_io_error(sd,"Invalid return from character read");
1228 V0 = (unsigned_word)-1;
1231 V0 = (unsigned_word)tmp;
1235 case 3: /* Densan monitor: void co(char chr) */
1236 case 12: /* void outbyte(char chr) : write a byte to "stdout" */
1238 char tmp = (char)(A0 & 0xFF);
1239 sim_io_write_stdout (sd, &tmp, sizeof(char));
1243 case 17: /* void _exit() */
1245 sim_io_eprintf (sd, "sim_monitor(17): _exit(int reason) to be coded\n");
1246 sim_engine_halt (SD, CPU, NULL, NULL_CIA, sim_exited,
1247 (unsigned int)(A0 & 0xFFFFFFFF));
1251 case 28: /* PMON flush_cache */
1254 case 55: /* void get_mem_info(unsigned int *ptr) */
1255 /* in: A0 = pointer to three word memory location */
1256 /* out: [A0 + 0] = size */
1257 /* [A0 + 4] = instruction cache size */
1258 /* [A0 + 8] = data cache size */
1261 unsigned_4 zero = 0;
1262 address_word mem_size;
1263 sim_memopt *entry, *match = NULL;
1265 /* Search for memory region mapped to KSEG0 or KSEG1. */
1266 for (entry = STATE_MEMOPT (sd);
1268 entry = entry->next)
1270 if ((entry->addr == K0BASE || entry->addr == K1BASE)
1271 && (!match || entry->level < match->level))
1276 for (alias = entry->alias;
1278 alias = alias->next)
1279 if ((alias->addr == K0BASE || alias->addr == K1BASE)
1280 && (!match || entry->level < match->level))
1285 /* Get region size, limit to KSEG1 size (512MB). */
1286 SIM_ASSERT (match != NULL);
1287 mem_size = (match->modulo != 0
1288 ? match->modulo : match->nr_bytes);
1289 if (mem_size > K1SIZE)
1294 sim_write (sd, A0 + 0, (unsigned char *)&value, 4);
1295 sim_write (sd, A0 + 4, (unsigned char *)&zero, 4);
1296 sim_write (sd, A0 + 8, (unsigned char *)&zero, 4);
1297 /* sim_io_eprintf (sd, "sim: get_mem_info() deprecated\n"); */
1301 case 158: /* PMON printf */
1302 /* in: A0 = pointer to format string */
1303 /* A1 = optional argument 1 */
1304 /* A2 = optional argument 2 */
1305 /* A3 = optional argument 3 */
1307 /* The following is based on the PMON printf source */
1309 address_word s = A0;
1311 signed_word *ap = &A1; /* 1st argument */
1312 /* This isn't the quickest way, since we call the host print
1313 routine for every character almost. But it does avoid
1314 having to allocate and manage a temporary string buffer. */
1315 /* TODO: Include check that we only use three arguments (A1,
1317 while (sim_read (sd, s++, &c, 1) && c != '\0')
1322 enum {FMT_RJUST, FMT_LJUST, FMT_RJUST0, FMT_CENTER} fmt = FMT_RJUST;
1323 int width = 0, trunc = 0, haddot = 0, longlong = 0;
1324 while (sim_read (sd, s++, &c, 1) && c != '\0')
1326 if (strchr ("dobxXulscefg%", c))
1341 else if (c >= '1' && c <= '9')
1345 while (sim_read (sd, s++, &c, 1) == 1 && isdigit (c))
1348 n = (unsigned int)strtol(tmp,NULL,10);
1361 sim_io_printf (sd, "%%");
1366 address_word p = *ap++;
1368 while (sim_read (sd, p++, &ch, 1) == 1 && ch != '\0')
1369 sim_io_printf(sd, "%c", ch);
1372 sim_io_printf(sd,"(null)");
1375 sim_io_printf (sd, "%c", (int)*ap++);
1380 sim_read (sd, s++, &c, 1);
1384 sim_read (sd, s++, &c, 1);
1387 if (strchr ("dobxXu", c))
1389 word64 lv = (word64) *ap++;
1391 sim_io_printf(sd,"<binary not supported>");
1394 sprintf (tmp, "%%%s%c", longlong ? "ll" : "", c);
1396 sim_io_printf(sd, tmp, lv);
1398 sim_io_printf(sd, tmp, (int)lv);
1401 else if (strchr ("eEfgG", c))
1403 double dbl = *(double*)(ap++);
1404 sprintf (tmp, "%%%d.%d%c", width, trunc, c);
1405 sim_io_printf (sd, tmp, dbl);
1411 sim_io_printf(sd, "%c", c);
1417 /* Unknown reason. */
1423 /* Store a word into memory. */
1426 store_word (SIM_DESC sd,
1432 address_word paddr = vaddr;
1434 if ((vaddr & 3) != 0)
1435 SignalExceptionAddressStore ();
1438 const uword64 mask = 7;
1442 paddr = (paddr & ~mask) | ((paddr & mask) ^ (ReverseEndian << 2));
1443 byte = (vaddr & mask) ^ (BigEndianCPU << 2);
1444 memval = ((uword64) val) << (8 * byte);
1445 StoreMemory (AccessLength_WORD, memval, 0, paddr, vaddr,
1450 /* Load a word from memory. */
1453 load_word (SIM_DESC sd,
1458 if ((vaddr & 3) != 0)
1460 SIM_CORE_SIGNAL (SD, cpu, cia, read_map, AccessLength_WORD+1, vaddr, read_transfer, sim_core_unaligned_signal);
1464 address_word paddr = vaddr;
1465 const uword64 mask = 0x7;
1466 const unsigned int reverse = ReverseEndian ? 1 : 0;
1467 const unsigned int bigend = BigEndianCPU ? 1 : 0;
1471 paddr = (paddr & ~mask) | ((paddr & mask) ^ (reverse << 2));
1472 LoadMemory (&memval, NULL, AccessLength_WORD, paddr, vaddr, isDATA,
1474 byte = (vaddr & mask) ^ (bigend << 2);
1475 return EXTEND32 (memval >> (8 * byte));
1481 /* Simulate the mips16 entry and exit pseudo-instructions. These
1482 would normally be handled by the reserved instruction exception
1483 code, but for ease of simulation we just handle them directly. */
1486 mips16_entry (SIM_DESC sd,
1491 int aregs, sregs, rreg;
1494 printf("DBG: mips16_entry: entered (insn = 0x%08X)\n",insn);
1497 aregs = (insn & 0x700) >> 8;
1498 sregs = (insn & 0x0c0) >> 6;
1499 rreg = (insn & 0x020) >> 5;
1501 /* This should be checked by the caller. */
1510 /* This is the entry pseudo-instruction. */
1512 for (i = 0; i < aregs; i++)
1513 store_word (SD, CPU, cia, (uword64) (SP + 4 * i), GPR[i + 4]);
1521 store_word (SD, CPU, cia, (uword64) tsp, RA);
1524 for (i = 0; i < sregs; i++)
1527 store_word (SD, CPU, cia, (uword64) tsp, GPR[16 + i]);
1535 /* This is the exit pseudo-instruction. */
1542 RA = load_word (SD, CPU, cia, (uword64) tsp);
1545 for (i = 0; i < sregs; i++)
1548 GPR[i + 16] = load_word (SD, CPU, cia, (uword64) tsp);
1553 if (CURRENT_FLOATING_POINT == HARD_FLOATING_POINT)
1557 FGR[0] = WORD64LO (GPR[4]);
1558 FPR_STATE[0] = fmt_uninterpreted;
1560 else if (aregs == 6)
1562 FGR[0] = WORD64LO (GPR[5]);
1563 FGR[1] = WORD64LO (GPR[4]);
1564 FPR_STATE[0] = fmt_uninterpreted;
1565 FPR_STATE[1] = fmt_uninterpreted;
1574 /*-- trace support ----------------------------------------------------------*/
1576 /* The trace support is provided (if required) in the memory accessing
1577 routines. Since we are also providing the architecture specific
1578 features, the architecture simulation code can also deal with
1579 notifying the trace world of cache flushes, etc. Similarly we do
1580 not need to provide profiling support in the simulator engine,
1581 since we can sample in the instruction fetch control loop. By
1582 defining the trace manifest, we add tracing as a run-time
1585 #if WITH_TRACE_ANY_P
1586 /* Tracing by default produces "din" format (as required by
1587 dineroIII). Each line of such a trace file *MUST* have a din label
1588 and address field. The rest of the line is ignored, so comments can
1589 be included if desired. The first field is the label which must be
1590 one of the following values:
1595 3 escape record (treated as unknown access type)
1596 4 escape record (causes cache flush)
1598 The address field is a 32bit (lower-case) hexadecimal address
1599 value. The address should *NOT* be preceded by "0x".
1601 The size of the memory transfer is not important when dealing with
1602 cache lines (as long as no more than a cache line can be
1603 transferred in a single operation :-), however more information
1604 could be given following the dineroIII requirement to allow more
1605 complete memory and cache simulators to provide better
1606 results. i.e. the University of Pisa has a cache simulator that can
1607 also take bus size and speed as (variable) inputs to calculate
1608 complete system performance (a much more useful ability when trying
1609 to construct an end product, rather than a processor). They
1610 currently have an ARM version of their tool called ChARM. */
1614 dotrace (SIM_DESC sd,
1622 if (STATE & simTRACE) {
1624 fprintf(tracefh,"%d %s ; width %d ; ",
1628 va_start(ap,comment);
1629 vfprintf(tracefh,comment,ap);
1631 fprintf(tracefh,"\n");
1633 /* NOTE: Since the "din" format will only accept 32bit addresses, and
1634 we may be generating 64bit ones, we should put the hi-32bits of the
1635 address into the comment field. */
1637 /* TODO: Provide a buffer for the trace lines. We can then avoid
1638 performing writes until the buffer is filled, or the file is
1641 /* NOTE: We could consider adding a comment field to the "din" file
1642 produced using type 3 markers (unknown access). This would then
1643 allow information about the program that the "din" is for, and
1644 the MIPs world that was being simulated, to be placed into the
1649 #endif /* WITH_TRACE_ANY_P */
1651 /*---------------------------------------------------------------------------*/
1652 /*-- simulator engine -------------------------------------------------------*/
1653 /*---------------------------------------------------------------------------*/
1656 ColdReset (SIM_DESC sd)
1659 for (cpu_nr = 0; cpu_nr < sim_engine_nr_cpus (sd); cpu_nr++)
1661 sim_cpu *cpu = STATE_CPU (sd, cpu_nr);
1662 /* RESET: Fixed PC address: */
1663 PC = (unsigned_word) UNSIGNED64 (0xFFFFFFFFBFC00000);
1664 /* The reset vector address is in the unmapped, uncached memory space. */
1666 SR &= ~(status_SR | status_TS | status_RP);
1667 SR |= (status_ERL | status_BEV);
1669 /* Cheat and allow access to the complete register set immediately */
1670 if (CURRENT_FLOATING_POINT == HARD_FLOATING_POINT
1671 && WITH_TARGET_WORD_BITSIZE == 64)
1672 SR |= status_FR; /* 64bit registers */
1674 /* Ensure that any instructions with pending register updates are
1676 PENDING_INVALIDATE();
1678 /* Initialise the FPU registers to the unknown state */
1679 if (CURRENT_FLOATING_POINT == HARD_FLOATING_POINT)
1682 for (rn = 0; (rn < 32); rn++)
1683 FPR_STATE[rn] = fmt_uninterpreted;
1686 /* Initialise the Config0 register. */
1687 C0_CONFIG = 0x80000000 /* Config1 present */
1688 | 2; /* KSEG0 uncached */
1689 if (WITH_TARGET_WORD_BITSIZE == 64)
1691 /* FIXME Currently mips/sim-main.c:address_translation()
1692 truncates all addresses to 32-bits. */
1693 if (0 && WITH_TARGET_ADDRESS_BITSIZE == 64)
1694 C0_CONFIG |= (2 << 13); /* MIPS64, 64-bit addresses */
1696 C0_CONFIG |= (1 << 13); /* MIPS64, 32-bit addresses */
1699 C0_CONFIG |= 0x00008000; /* Big Endian */
1706 /* Description from page A-26 of the "MIPS IV Instruction Set" manual (revision 3.1) */
1707 /* Signal an exception condition. This will result in an exception
1708 that aborts the instruction. The instruction operation pseudocode
1709 will never see a return from this function call. */
1712 signal_exception (SIM_DESC sd,
1720 sim_io_printf(sd,"DBG: SignalException(%d) PC = 0x%s\n",exception,pr_addr(cia));
1723 /* Ensure that any active atomic read/modify/write operation will fail: */
1726 /* Save registers before interrupt dispatching */
1727 #ifdef SIM_CPU_EXCEPTION_TRIGGER
1728 SIM_CPU_EXCEPTION_TRIGGER(sd, cpu, cia);
1731 switch (exception) {
1733 case DebugBreakPoint:
1734 if (! (Debug & Debug_DM))
1740 Debug |= Debug_DBD; /* signaled from within in delay slot */
1741 DEPC = cia - 4; /* reference the branch instruction */
1745 Debug &= ~Debug_DBD; /* not signaled from within a delay slot */
1749 Debug |= Debug_DM; /* in debugging mode */
1750 Debug |= Debug_DBp; /* raising a DBp exception */
1752 sim_engine_restart (SD, CPU, NULL, NULL_CIA);
1756 case ReservedInstruction:
1759 unsigned int instruction;
1760 va_start(ap,exception);
1761 instruction = va_arg(ap,unsigned int);
1763 /* Provide simple monitor support using ReservedInstruction
1764 exceptions. The following code simulates the fixed vector
1765 entry points into the IDT monitor by causing a simulator
1766 trap, performing the monitor operation, and returning to
1767 the address held in the $ra register (standard PCS return
1768 address). This means we only need to pre-load the vector
1769 space with suitable instruction values. For systems were
1770 actual trap instructions are used, we would not need to
1771 perform this magic. */
1772 if ((instruction & RSVD_INSTRUCTION_MASK) == RSVD_INSTRUCTION)
1774 int reason = (instruction >> RSVD_INSTRUCTION_ARG_SHIFT) & RSVD_INSTRUCTION_ARG_MASK;
1775 if (!sim_monitor (SD, CPU, cia, reason))
1776 sim_io_error (sd, "sim_monitor: unhandled reason = %d, pc = 0x%s\n", reason, pr_addr (cia));
1778 /* NOTE: This assumes that a branch-and-link style
1779 instruction was used to enter the vector (which is the
1780 case with the current IDT monitor). */
1781 sim_engine_restart (SD, CPU, NULL, RA);
1783 /* Look for the mips16 entry and exit instructions, and
1784 simulate a handler for them. */
1785 else if ((cia & 1) != 0
1786 && (instruction & 0xf81f) == 0xe809
1787 && (instruction & 0x0c0) != 0x0c0)
1789 mips16_entry (SD, CPU, cia, instruction);
1790 sim_engine_restart (sd, NULL, NULL, NULL_CIA);
1792 /* else fall through to normal exception processing */
1793 sim_io_eprintf(sd,"ReservedInstruction at PC = 0x%s\n", pr_addr (cia));
1797 /* Store exception code into current exception id variable (used
1800 /* TODO: If not simulating exceptions then stop the simulator
1801 execution. At the moment we always stop the simulation. */
1803 #ifdef SUBTARGET_R3900
1804 /* update interrupt-related registers */
1806 /* insert exception code in bits 6:2 */
1807 CAUSE = LSMASKED32(CAUSE, 31, 7) | LSINSERTED32(exception, 6, 2);
1808 /* shift IE/KU history bits left */
1809 SR = LSMASKED32(SR, 31, 4) | LSINSERTED32(LSEXTRACTED32(SR, 3, 0), 5, 2);
1811 if (STATE & simDELAYSLOT)
1813 STATE &= ~simDELAYSLOT;
1815 EPC = (cia - 4); /* reference the branch instruction */
1820 if (SR & status_BEV)
1821 PC = (signed)0xBFC00000 + 0x180;
1823 PC = (signed)0x80000000 + 0x080;
1825 /* See figure 5-17 for an outline of the code below */
1826 if (! (SR & status_EXL))
1828 CAUSE = (exception << 2);
1829 if (STATE & simDELAYSLOT)
1831 STATE &= ~simDELAYSLOT;
1833 EPC = (cia - 4); /* reference the branch instruction */
1837 /* FIXME: TLB et.al. */
1838 /* vector = 0x180; */
1842 CAUSE = (exception << 2);
1843 /* vector = 0x180; */
1846 /* Store exception code into current exception id variable (used
1849 if (SR & status_BEV)
1850 PC = (signed)0xBFC00200 + 0x180;
1852 PC = (signed)0x80000000 + 0x180;
1855 switch ((CAUSE >> 2) & 0x1F)
1858 /* Interrupts arrive during event processing, no need to
1864 #ifdef SUBTARGET_3900
1865 /* Exception vector: BEV=0 BFC00000 / BEF=1 BFC00000 */
1866 PC = (signed)0xBFC00000;
1867 #endif /* SUBTARGET_3900 */
1870 case TLBModification:
1875 case InstructionFetch:
1877 /* The following is so that the simulator will continue from the
1878 exception handler address. */
1879 sim_engine_halt (SD, CPU, NULL, PC,
1880 sim_stopped, SIM_SIGBUS);
1882 case ReservedInstruction:
1883 case CoProcessorUnusable:
1885 sim_engine_halt (SD, CPU, NULL, PC,
1886 sim_stopped, SIM_SIGILL);
1888 case IntegerOverflow:
1890 sim_engine_halt (SD, CPU, NULL, PC,
1891 sim_stopped, SIM_SIGFPE);
1894 sim_engine_halt (SD, CPU, NULL, PC, sim_stopped, SIM_SIGTRAP);
1899 sim_engine_restart (SD, CPU, NULL, PC);
1904 sim_engine_halt (SD, CPU, NULL, PC,
1905 sim_stopped, SIM_SIGTRAP);
1907 default: /* Unknown internal exception */
1909 sim_engine_halt (SD, CPU, NULL, PC,
1910 sim_stopped, SIM_SIGABRT);
1914 case SimulatorFault:
1918 va_start(ap,exception);
1919 msg = va_arg(ap,char *);
1921 sim_engine_abort (SD, CPU, NULL_CIA,
1922 "FATAL: Simulator error \"%s\"\n",msg);
1931 /* This function implements what the MIPS32 and MIPS64 ISAs define as
1932 "UNPREDICTABLE" behaviour.
1934 About UNPREDICTABLE behaviour they say: "UNPREDICTABLE results
1935 may vary from processor implementation to processor implementation,
1936 instruction to instruction, or as a function of time on the same
1937 implementation or instruction. Software can never depend on results
1938 that are UNPREDICTABLE. ..." (MIPS64 Architecture for Programmers
1939 Volume II, The MIPS64 Instruction Set. MIPS Document MD00087 revision
1942 For UNPREDICTABLE behaviour, we print a message, if possible print
1943 the offending instructions mips.igen instruction name (provided by
1944 the caller), and stop the simulator.
1946 XXX FIXME: eventually, stopping the simulator should be made conditional
1947 on a command-line option. */
1949 unpredictable_action(sim_cpu *cpu, address_word cia)
1951 SIM_DESC sd = CPU_STATE(cpu);
1953 sim_io_eprintf(sd, "UNPREDICTABLE: PC = 0x%s\n", pr_addr (cia));
1954 sim_engine_halt (SD, CPU, NULL, cia, sim_stopped, SIM_SIGABRT);
1958 /*-- co-processor support routines ------------------------------------------*/
1961 CoProcPresent(unsigned int coproc_number)
1963 /* Return TRUE if simulator provides a model for the given co-processor number */
1968 cop_lw (SIM_DESC sd,
1973 unsigned int memword)
1978 if (CURRENT_FLOATING_POINT == HARD_FLOATING_POINT)
1981 printf("DBG: COP_LW: memword = 0x%08X (uword64)memword = 0x%s\n",memword,pr_addr(memword));
1983 StoreFPR(coproc_reg,fmt_uninterpreted_32,(uword64)memword);
1988 #if 0 /* this should be controlled by a configuration option */
1989 sim_io_printf(sd,"COP_LW(%d,%d,0x%08X) at PC = 0x%s : TODO (architecture specific)\n",coproc_num,coproc_reg,memword,pr_addr(cia));
1998 cop_ld (SIM_DESC sd,
2007 printf("DBG: COP_LD: coproc_num = %d, coproc_reg = %d, value = 0x%s : PC = 0x%s\n", coproc_num, coproc_reg, pr_uword64(memword), pr_addr(cia) );
2010 switch (coproc_num) {
2012 if (CURRENT_FLOATING_POINT == HARD_FLOATING_POINT)
2014 StoreFPR(coproc_reg,fmt_uninterpreted_64,memword);
2019 #if 0 /* this message should be controlled by a configuration option */
2020 sim_io_printf(sd,"COP_LD(%d,%d,0x%s) at PC = 0x%s : TODO (architecture specific)\n",coproc_num,coproc_reg,pr_addr(memword),pr_addr(cia));
2032 cop_sw (SIM_DESC sd,
2038 unsigned int value = 0;
2043 if (CURRENT_FLOATING_POINT == HARD_FLOATING_POINT)
2045 value = (unsigned int)ValueFPR(coproc_reg,fmt_uninterpreted_32);
2050 #if 0 /* should be controlled by configuration option */
2051 sim_io_printf(sd,"COP_SW(%d,%d) at PC = 0x%s : TODO (architecture specific)\n",coproc_num,coproc_reg,pr_addr(cia));
2060 cop_sd (SIM_DESC sd,
2070 if (CURRENT_FLOATING_POINT == HARD_FLOATING_POINT)
2072 value = ValueFPR(coproc_reg,fmt_uninterpreted_64);
2077 #if 0 /* should be controlled by configuration option */
2078 sim_io_printf(sd,"COP_SD(%d,%d) at PC = 0x%s : TODO (architecture specific)\n",coproc_num,coproc_reg,pr_addr(cia));
2090 decode_coproc (SIM_DESC sd,
2093 unsigned int instruction,
2102 case 0: /* standard CPU control and cache registers */
2104 /* R4000 Users Manual (second edition) lists the following CP0
2106 CODE><-RT><RD-><--TAIL--->
2107 DMFC0 Doubleword Move From CP0 (VR4100 = 01000000001tttttddddd00000000000)
2108 DMTC0 Doubleword Move To CP0 (VR4100 = 01000000101tttttddddd00000000000)
2109 MFC0 word Move From CP0 (VR4100 = 01000000000tttttddddd00000000000)
2110 MTC0 word Move To CP0 (VR4100 = 01000000100tttttddddd00000000000)
2111 TLBR Read Indexed TLB Entry (VR4100 = 01000010000000000000000000000001)
2112 TLBWI Write Indexed TLB Entry (VR4100 = 01000010000000000000000000000010)
2113 TLBWR Write Random TLB Entry (VR4100 = 01000010000000000000000000000110)
2114 TLBP Probe TLB for Matching Entry (VR4100 = 01000010000000000000000000001000)
2115 CACHE Cache operation (VR4100 = 101111bbbbbpppppiiiiiiiiiiiiiiii)
2116 ERET Exception return (VR4100 = 01000010000000000000000000011000)
2118 if (((op == cp0_mfc0) || (op == cp0_mtc0) /* MFC0 / MTC0 */
2119 || (op == cp0_dmfc0) || (op == cp0_dmtc0)) /* DMFC0 / DMTC0 */
2122 switch (rd) /* NOTEs: Standard CP0 registers */
2124 /* 0 = Index R4000 VR4100 VR4300 */
2125 /* 1 = Random R4000 VR4100 VR4300 */
2126 /* 2 = EntryLo0 R4000 VR4100 VR4300 */
2127 /* 3 = EntryLo1 R4000 VR4100 VR4300 */
2128 /* 4 = Context R4000 VR4100 VR4300 */
2129 /* 5 = PageMask R4000 VR4100 VR4300 */
2130 /* 6 = Wired R4000 VR4100 VR4300 */
2131 /* 8 = BadVAddr R4000 VR4100 VR4300 */
2132 /* 9 = Count R4000 VR4100 VR4300 */
2133 /* 10 = EntryHi R4000 VR4100 VR4300 */
2134 /* 11 = Compare R4000 VR4100 VR4300 */
2135 /* 12 = SR R4000 VR4100 VR4300 */
2136 #ifdef SUBTARGET_R3900
2138 /* 3 = Config R3900 */
2140 /* 7 = Cache R3900 */
2142 /* 15 = PRID R3900 */
2148 /* 8 = BadVAddr R4000 VR4100 VR4300 */
2149 if (op == cp0_mfc0 || op == cp0_dmfc0)
2150 GPR[rt] = (signed_word) (signed_address) COP0_BADVADDR;
2152 COP0_BADVADDR = GPR[rt];
2155 #endif /* SUBTARGET_R3900 */
2157 if (op == cp0_mfc0 || op == cp0_dmfc0)
2162 /* 13 = Cause R4000 VR4100 VR4300 */
2164 if (op == cp0_mfc0 || op == cp0_dmfc0)
2169 /* 14 = EPC R4000 VR4100 VR4300 */
2171 if (op == cp0_mfc0 || op == cp0_dmfc0)
2172 GPR[rt] = (signed_word) (signed_address) EPC;
2176 /* 15 = PRId R4000 VR4100 VR4300 */
2177 #ifdef SUBTARGET_R3900
2180 if (op == cp0_mfc0 || op == cp0_dmfc0)
2186 /* 16 = Config R4000 VR4100 VR4300 */
2188 if (op == cp0_mfc0 || op == cp0_dmfc0)
2189 GPR[rt] = C0_CONFIG;
2191 /* only bottom three bits are writable */
2192 C0_CONFIG = (C0_CONFIG & ~0x7) | (GPR[rt] & 0x7);
2195 #ifdef SUBTARGET_R3900
2198 if (op == cp0_mfc0 || op == cp0_dmfc0)
2204 /* 17 = LLAddr R4000 VR4100 VR4300 */
2206 /* 18 = WatchLo R4000 VR4100 VR4300 */
2207 /* 19 = WatchHi R4000 VR4100 VR4300 */
2208 /* 20 = XContext R4000 VR4100 VR4300 */
2209 /* 26 = PErr or ECC R4000 VR4100 VR4300 */
2210 /* 27 = CacheErr R4000 VR4100 */
2211 /* 28 = TagLo R4000 VR4100 VR4300 */
2212 /* 29 = TagHi R4000 VR4100 VR4300 */
2213 /* 30 = ErrorEPC R4000 VR4100 VR4300 */
2214 if (STATE_VERBOSE_P(SD))
2216 "Warning: PC 0x%lx:interp.c decode_coproc DEADC0DE\n",
2217 (unsigned long)cia);
2218 GPR[rt] = 0xDEADC0DE; /* CPR[0,rd] */
2219 /* CPR[0,rd] = GPR[rt]; */
2221 if (op == cp0_mfc0 || op == cp0_dmfc0)
2222 GPR[rt] = (signed_word) (signed32) COP0_GPR[rd];
2224 COP0_GPR[rd] = GPR[rt];
2227 sim_io_printf(sd,"Warning: MFC0 %d,%d ignored, PC=%08x (architecture specific)\n",rt,rd, (unsigned)cia);
2229 sim_io_printf(sd,"Warning: MTC0 %d,%d ignored, PC=%08x (architecture specific)\n",rt,rd, (unsigned)cia);
2233 else if ((op == cp0_mfc0 || op == cp0_dmfc0)
2236 /* [D]MFC0 RT,C0_CONFIG,SEL */
2244 /* MIPS32 r/o Config1:
2247 /* MIPS16 implemented.
2248 XXX How to check configuration? */
2250 if (CURRENT_FLOATING_POINT == HARD_FLOATING_POINT)
2251 /* MDMX & FPU implemented */
2255 /* MIPS32 r/o Config2:
2260 /* MIPS32 r/o Config3:
2261 SmartMIPS implemented. */
2267 else if (op == cp0_eret && sel == 0x18)
2270 if (SR & status_ERL)
2272 /* Oops, not yet available */
2273 sim_io_printf(sd,"Warning: ERET when SR[ERL] set not handled yet");
2283 else if (op == cp0_rfe && sel == 0x10)
2286 #ifdef SUBTARGET_R3900
2287 /* TX39: Copy IEp/KUp -> IEc/KUc, and IEo/KUo -> IEp/KUp */
2289 /* shift IE/KU history bits right */
2290 SR = LSMASKED32(SR, 31, 4) | LSINSERTED32(LSEXTRACTED32(SR, 5, 2), 3, 0);
2292 /* TODO: CACHE register */
2293 #endif /* SUBTARGET_R3900 */
2295 else if (op == cp0_deret && sel == 0x1F)
2303 sim_io_eprintf(sd,"Unrecognised COP0 instruction 0x%08X at PC = 0x%s : No handler present\n",instruction,pr_addr(cia));
2304 /* TODO: When executing an ERET or RFE instruction we should
2305 clear LLBIT, to ensure that any out-standing atomic
2306 read/modify/write sequence fails. */
2310 case 2: /* co-processor 2 */
2317 sim_io_eprintf(sd, "COP2 instruction 0x%08X at PC = 0x%s : No handler present\n",
2318 instruction,pr_addr(cia));
2323 case 1: /* should not occur (FPU co-processor) */
2324 case 3: /* should not occur (FPU co-processor) */
2325 SignalException(ReservedInstruction,instruction);
2333 /* This code copied from gdb's utils.c. Would like to share this code,
2334 but don't know of a common place where both could get to it. */
2336 /* Temporary storage using circular buffer */
2342 static char buf[NUMCELLS][CELLSIZE];
2344 if (++cell>=NUMCELLS) cell=0;
2348 /* Print routines to handle variable size regs, etc */
2350 /* Eliminate warning from compiler on 32-bit systems */
2351 static int thirty_two = 32;
2354 pr_addr (SIM_ADDR addr)
2356 char *paddr_str=get_cell();
2357 switch (sizeof(addr))
2360 sprintf(paddr_str,"%08lx%08lx",
2361 (unsigned long)(addr>>thirty_two),(unsigned long)(addr&0xffffffff));
2364 sprintf(paddr_str,"%08lx",(unsigned long)addr);
2367 sprintf(paddr_str,"%04x",(unsigned short)(addr&0xffff));
2370 sprintf(paddr_str,"%x",addr);
2376 pr_uword64 (uword64 addr)
2378 char *paddr_str=get_cell();
2379 sprintf(paddr_str,"%08lx%08lx",
2380 (unsigned long)(addr>>thirty_two),(unsigned long)(addr&0xffffffff));
2386 mips_core_signal (SIM_DESC sd,
2392 transfer_type transfer,
2393 sim_core_signals sig)
2395 const char *copy = (transfer == read_transfer ? "read" : "write");
2396 address_word ip = CIA_ADDR (cia);
2400 case sim_core_unmapped_signal:
2401 sim_io_eprintf (sd, "mips-core: %d byte %s to unmapped address 0x%lx at 0x%lx\n",
2403 (unsigned long) addr, (unsigned long) ip);
2404 COP0_BADVADDR = addr;
2405 SignalExceptionDataReference();
2408 case sim_core_unaligned_signal:
2409 sim_io_eprintf (sd, "mips-core: %d byte %s to unaligned address 0x%lx at 0x%lx\n",
2411 (unsigned long) addr, (unsigned long) ip);
2412 COP0_BADVADDR = addr;
2413 if(transfer == read_transfer)
2414 SignalExceptionAddressLoad();
2416 SignalExceptionAddressStore();
2420 sim_engine_abort (sd, cpu, cia,
2421 "mips_core_signal - internal error - bad switch");
2427 mips_cpu_exception_trigger(SIM_DESC sd, sim_cpu* cpu, address_word cia)
2429 ASSERT(cpu != NULL);
2431 if(cpu->exc_suspended > 0)
2432 sim_io_eprintf(sd, "Warning, nested exception triggered (%d)\n", cpu->exc_suspended);
2435 memcpy(cpu->exc_trigger_registers, cpu->registers, sizeof(cpu->exc_trigger_registers));
2436 cpu->exc_suspended = 0;
2440 mips_cpu_exception_suspend(SIM_DESC sd, sim_cpu* cpu, int exception)
2442 ASSERT(cpu != NULL);
2444 if(cpu->exc_suspended > 0)
2445 sim_io_eprintf(sd, "Warning, nested exception signal (%d then %d)\n",
2446 cpu->exc_suspended, exception);
2448 memcpy(cpu->exc_suspend_registers, cpu->registers, sizeof(cpu->exc_suspend_registers));
2449 memcpy(cpu->registers, cpu->exc_trigger_registers, sizeof(cpu->registers));
2450 cpu->exc_suspended = exception;
2454 mips_cpu_exception_resume(SIM_DESC sd, sim_cpu* cpu, int exception)
2456 ASSERT(cpu != NULL);
2458 if(exception == 0 && cpu->exc_suspended > 0)
2460 /* warn not for breakpoints */
2461 if(cpu->exc_suspended != sim_signal_to_host(sd, SIM_SIGTRAP))
2462 sim_io_eprintf(sd, "Warning, resuming but ignoring pending exception signal (%d)\n",
2463 cpu->exc_suspended);
2465 else if(exception != 0 && cpu->exc_suspended > 0)
2467 if(exception != cpu->exc_suspended)
2468 sim_io_eprintf(sd, "Warning, resuming with mismatched exception signal (%d vs %d)\n",
2469 cpu->exc_suspended, exception);
2471 memcpy(cpu->registers, cpu->exc_suspend_registers, sizeof(cpu->registers));
2473 else if(exception != 0 && cpu->exc_suspended == 0)
2475 sim_io_eprintf(sd, "Warning, ignoring spontanous exception signal (%d)\n", exception);
2477 cpu->exc_suspended = 0;
2481 /*---------------------------------------------------------------------------*/
2482 /*> EOF interp.c <*/