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.
22 The IDT monitor (found on the VR4300 board), seems to lie about
23 register contents. It seems to treat the registers as sign-extended
24 32-bit values. This cause *REAL* problems when single-stepping 64-bit
29 /* The TRACE manifests enable the provision of extra features. If they
30 are not defined then a simpler (quicker) simulator is constructed
31 without the required run-time checks, etc. */
32 #if 1 /* 0 to allow user build selection, 1 to force inclusion */
38 #include "sim-utils.h"
39 #include "sim-options.h"
40 #include "sim-assert.h"
62 #include "libiberty.h"
64 #include "callback.h" /* GDB simulator callback interface */
65 #include "remote-sim.h" /* GDB simulator interface */
73 char* pr_addr
PARAMS ((SIM_ADDR addr
));
74 char* pr_uword64
PARAMS ((uword64 addr
));
77 /* Get the simulator engine description, without including the code: */
83 /* The following reserved instruction value is used when a simulator
84 trap is required. NOTE: Care must be taken, since this value may be
85 used in later revisions of the MIPS ISA. */
86 #define RSVD_INSTRUCTION (0x00000005)
87 #define RSVD_INSTRUCTION_MASK (0xFC00003F)
89 #define RSVD_INSTRUCTION_ARG_SHIFT 6
90 #define RSVD_INSTRUCTION_ARG_MASK 0xFFFFF
93 /* Bits in the Debug register */
94 #define Debug_DBD 0x80000000 /* Debug Branch Delay */
95 #define Debug_DM 0x40000000 /* Debug Mode */
96 #define Debug_DBp 0x00000002 /* Debug Breakpoint indicator */
102 /*---------------------------------------------------------------------------*/
103 /*-- GDB simulator interface ------------------------------------------------*/
104 /*---------------------------------------------------------------------------*/
106 static void ColdReset
PARAMS((SIM_DESC sd
));
108 /*---------------------------------------------------------------------------*/
112 #define DELAYSLOT() {\
113 if (STATE & simDELAYSLOT)\
114 sim_io_eprintf(sd,"Delay slot already activated (branch in delay slot?)\n");\
115 STATE |= simDELAYSLOT;\
118 #define JALDELAYSLOT() {\
120 STATE |= simJALDELAYSLOT;\
124 STATE &= ~simDELAYSLOT;\
125 STATE |= simSKIPNEXT;\
128 #define CANCELDELAYSLOT() {\
130 STATE &= ~(simDELAYSLOT | simJALDELAYSLOT);\
133 #define INDELAYSLOT() ((STATE & simDELAYSLOT) != 0)
134 #define INJALDELAYSLOT() ((STATE & simJALDELAYSLOT) != 0)
136 #define K0BASE (0x80000000)
137 #define K0SIZE (0x20000000)
138 #define K1BASE (0xA0000000)
139 #define K1SIZE (0x20000000)
140 #define MONITOR_BASE (0xBFC00000)
141 #define MONITOR_SIZE (1 << 11)
142 #define MEM_SIZE (2 << 20)
145 static char *tracefile
= "trace.din"; /* default filename for trace log */
146 FILE *tracefh
= NULL
;
147 static void open_trace
PARAMS((SIM_DESC sd
));
150 #define OPTION_DINERO_TRACE 200
151 #define OPTION_DINERO_FILE 201
154 mips_option_handler (sd
, opt
, arg
)
161 case OPTION_DINERO_TRACE
: /* ??? */
163 /* Eventually the simTRACE flag could be treated as a toggle, to
164 allow external control of the program points being traced
165 (i.e. only from main onwards, excluding the run-time setup,
169 else if (strcmp (arg
, "yes") == 0)
171 else if (strcmp (arg
, "no") == 0)
173 else if (strcmp (arg
, "on") == 0)
175 else if (strcmp (arg
, "off") == 0)
179 fprintf (stderr
, "Unreconized dinero-trace option `%s'\n", arg
);
185 Simulator constructed without dinero tracing support (for performance).\n\
186 Re-compile simulator with \"-DTRACE\" to enable this option.\n");
190 case OPTION_DINERO_FILE
:
192 if (optarg
!= NULL
) {
194 tmp
= (char *)malloc(strlen(optarg
) + 1);
197 sim_io_printf(sd
,"Failed to allocate buffer for tracefile name \"%s\"\n",optarg
);
203 sim_io_printf(sd
,"Placing trace information into file \"%s\"\n",tracefile
);
214 static const OPTION mips_options
[] =
216 { {"dinero-trace", optional_argument
, NULL
, OPTION_DINERO_TRACE
},
217 '\0', "on|off", "Enable dinero tracing",
218 mips_option_handler
},
219 { {"dinero-file", required_argument
, NULL
, OPTION_DINERO_FILE
},
220 '\0', "FILE", "Write dinero trace to FILE",
221 mips_option_handler
},
222 { {NULL
, no_argument
, NULL
, 0}, '\0', NULL
, NULL
, NULL
}
226 int interrupt_pending
;
229 interrupt_event (SIM_DESC sd
, void *data
)
233 interrupt_pending
= 0;
234 SignalExceptionInterrupt ();
236 else if (!interrupt_pending
)
237 sim_events_schedule (sd
, 1, interrupt_event
, data
);
242 /*---------------------------------------------------------------------------*/
243 /*-- GDB simulator interface ------------------------------------------------*/
244 /*---------------------------------------------------------------------------*/
247 sim_open (kind
, cb
, abfd
, argv
)
253 SIM_DESC sd
= sim_state_alloc (kind
, cb
);
254 sim_cpu
*cpu
= STATE_CPU (sd
, 0);
256 SIM_ASSERT (STATE_MAGIC (sd
) == SIM_MAGIC_NUMBER
);
258 /* FIXME: watchpoints code shouldn't need this */
259 STATE_WATCHPOINTS (sd
)->pc
= &(PC
);
260 STATE_WATCHPOINTS (sd
)->sizeof_pc
= sizeof (PC
);
261 STATE_WATCHPOINTS (sd
)->interrupt_handler
= interrupt_event
;
265 if (sim_pre_argv_init (sd
, argv
[0]) != SIM_RC_OK
)
267 sim_add_option_table (sd
, mips_options
);
269 /* Allocate core managed memory */
272 sim_do_commandf (sd
, "memory region 0x%lx,0x%lx", MONITOR_BASE
, MONITOR_SIZE
);
273 /* For compatibility with the old code - under this (at level one)
274 are the kernel spaces K0 & K1. Both of these map to a single
275 smaller sub region */
276 sim_do_commandf (sd
, "memory alias 0x%lx@1,0x%lx%%0x%lx,0x%0x",
278 MEM_SIZE
, /* actual size */
281 /* getopt will print the error message so we just have to exit if this fails.
282 FIXME: Hmmm... in the case of gdb we need getopt to call
284 if (sim_parse_args (sd
, argv
) != SIM_RC_OK
)
286 /* Uninstall the modules to avoid memory leaks,
287 file descriptor leaks, etc. */
288 sim_module_uninstall (sd
);
292 /* check for/establish the a reference program image */
293 if (sim_analyze_program (sd
,
294 (STATE_PROG_ARGV (sd
) != NULL
295 ? *STATE_PROG_ARGV (sd
)
299 sim_module_uninstall (sd
);
303 /* Configure/verify the target byte order and other runtime
304 configuration options */
305 if (sim_config (sd
) != SIM_RC_OK
)
307 sim_module_uninstall (sd
);
311 if (sim_post_argv_init (sd
) != SIM_RC_OK
)
313 /* Uninstall the modules to avoid memory leaks,
314 file descriptor leaks, etc. */
315 sim_module_uninstall (sd
);
319 /* verify assumptions the simulator made about the host type system.
320 This macro does not return if there is a problem */
321 SIM_ASSERT (sizeof(int) == (4 * sizeof(char)));
322 SIM_ASSERT (sizeof(word64
) == (8 * sizeof(char)));
325 /* Check that the host FPU conforms to IEEE 754-1985 for the SINGLE
326 and DOUBLE binary formats. This is a bit nasty, requiring that we
327 trust the explicit manifests held in the source: */
328 /* TODO: We need to cope with the simulated target and the host not
329 having the same endianness. This will require the high and low
330 words of a (double) to be swapped when converting between the
331 host and the simulated target. */
339 s
.d
= (double)523.2939453125;
341 if ((s
.i
[0] == 0 && (s
.f
[1] != (float)4.01102924346923828125
342 || s
.i
[1] != 0x40805A5A))
343 || (s
.i
[1] == 0 && (s
.f
[0] != (float)4.01102924346923828125
344 || s
.i
[0] != 0x40805A5A)))
346 fprintf(stderr
,"The host executing the simulator does not seem to have IEEE 754-1985 std FP\n");
352 /* This is NASTY, in that we are assuming the size of specific
356 for (rn
= 0; (rn
< (LAST_EMBED_REGNUM
+ 1)); rn
++) {
358 cpu
->register_widths
[rn
] = GPRLEN
;
359 else if ((rn
>= FGRIDX
) && (rn
< (FGRIDX
+ 32)))
360 cpu
->register_widths
[rn
] = GPRLEN
;
361 else if ((rn
>= 33) && (rn
<= 37))
362 cpu
->register_widths
[rn
] = GPRLEN
;
363 else if ((rn
== SRIDX
) || (rn
== FCR0IDX
) || (rn
== FCR31IDX
) || ((rn
>= 72) && (rn
<= 89)))
364 cpu
->register_widths
[rn
] = 32;
366 cpu
->register_widths
[rn
] = 0;
368 /* start-sanitize-r5900 */
370 /* set the 5900 "upper" registers to 64 bits */
371 for( rn
= LAST_EMBED_REGNUM
+1; rn
< NUM_REGS
; rn
++)
372 cpu
->register_widths
[rn
] = 64;
373 /* end-sanitize-r5900 */
377 if (STATE
& simTRACE
)
381 /* Write the monitor trap address handlers into the monitor (eeprom)
382 address space. This can only be done once the target endianness
383 has been determined. */
386 /* Entry into the IDT monitor is via fixed address vectors, and
387 not using machine instructions. To avoid clashing with use of
388 the MIPS TRAP system, we place our own (simulator specific)
389 "undefined" instructions into the relevant vector slots. */
390 for (loop
= 0; (loop
< MONITOR_SIZE
); loop
+= 4)
392 address_word vaddr
= (MONITOR_BASE
+ loop
);
393 unsigned32 insn
= (RSVD_INSTRUCTION
| (((loop
>> 2) & RSVD_INSTRUCTION_ARG_MASK
) << RSVD_INSTRUCTION_ARG_SHIFT
));
395 sim_write (sd
, vaddr
, (char *)&insn
, sizeof (insn
));
397 /* The PMON monitor uses the same address space, but rather than
398 branching into it the address of a routine is loaded. We can
399 cheat for the moment, and direct the PMON routine to IDT style
400 instructions within the monitor space. This relies on the IDT
401 monitor not using the locations from 0xBFC00500 onwards as its
403 for (loop
= 0; (loop
< 24); loop
++)
405 address_word vaddr
= (MONITOR_BASE
+ 0x500 + (loop
* 4));
406 unsigned32 value
= ((0x500 - 8) / 8); /* default UNDEFINED reason code */
422 value
= ((0x500 - 16) / 8); /* not an IDT reason code */
424 case 8: /* cliexit */
427 case 11: /* flush_cache */
431 /* FIXME - should monitor_base be SIM_ADDR?? */
432 value
= ((unsigned int)MONITOR_BASE
+ (value
* 8));
434 sim_write (sd
, vaddr
, (char *)&value
, sizeof (value
));
436 /* The LSI MiniRISC PMON has its vectors at 0x200, not 0x500. */
438 sim_write (sd
, vaddr
, (char *)&value
, sizeof (value
));
450 tracefh
= fopen(tracefile
,"wb+");
453 sim_io_eprintf(sd
,"Failed to create file \"%s\", writing trace information to stderr.\n",tracefile
);
460 sim_close (sd
, quitting
)
465 printf("DBG: sim_close: entered (quitting = %d)\n",quitting
);
468 /* "quitting" is non-zero if we cannot hang on errors */
470 /* Ensure that any resources allocated through the callback
471 mechanism are released: */
472 sim_io_shutdown (sd
);
475 if (tracefh
!= NULL
&& tracefh
!= stderr
)
486 sim_write (sd
,addr
,buffer
,size
)
489 unsigned char *buffer
;
494 /* Return the number of bytes written, or zero if error. */
496 sim_io_printf(sd
,"sim_write(0x%s,buffer,%d);\n",pr_addr(addr
),size
);
499 /* We use raw read and write routines, since we do not want to count
500 the GDB memory accesses in our statistics gathering. */
502 for (index
= 0; index
< size
; index
++)
504 address_word vaddr
= (address_word
)addr
+ index
;
507 if (!address_translation (sd
, NULL_CIA
, vaddr
, isDATA
, isSTORE
, &paddr
, &cca
, isRAW
))
509 if (sim_core_write_buffer (sd
, NULL
, sim_core_read_map
, buffer
+ index
, paddr
, 1) != 1)
517 sim_read (sd
,addr
,buffer
,size
)
520 unsigned char *buffer
;
525 /* Return the number of bytes read, or zero if error. */
527 sim_io_printf(sd
,"sim_read(0x%s,buffer,%d);\n",pr_addr(addr
),size
);
530 for (index
= 0; (index
< size
); index
++)
532 address_word vaddr
= (address_word
)addr
+ index
;
535 if (!address_translation (sd
, NULL_CIA
, vaddr
, isDATA
, isLOAD
, &paddr
, &cca
, isRAW
))
537 if (sim_core_read_buffer (sd
, NULL
, sim_core_read_map
, buffer
+ index
, paddr
, 1) != 1)
545 sim_store_register (sd
,rn
,memory
)
548 unsigned char *memory
;
550 sim_cpu
*cpu
= STATE_CPU (sd
, 0);
551 /* NOTE: gdb (the client) stores registers in target byte order
552 while the simulator uses host byte order */
554 sim_io_printf(sd
,"sim_store_register(%d,*memory=0x%s);\n",rn
,pr_addr(*((SIM_ADDR
*)memory
)));
557 /* Unfortunately this suffers from the same problem as the register
558 numbering one. We need to know what the width of each logical
559 register number is for the architecture being simulated. */
561 if (cpu
->register_widths
[rn
] == 0)
562 sim_io_eprintf(sd
,"Invalid register width for %d (register store ignored)\n",rn
);
563 /* start-sanitize-r5900 */
564 else if (rn
== REGISTER_SA
)
565 SA
= T2H_8(*(uword64
*)memory
);
566 else if (rn
> LAST_EMBED_REGNUM
)
567 cpu
->registers1
[rn
- LAST_EMBED_REGNUM
- 1] = T2H_8(*(uword64
*)memory
);
568 /* end-sanitize-r5900 */
569 else if (cpu
->register_widths
[rn
] == 32)
570 cpu
->registers
[rn
] = T2H_4 (*(unsigned int*)memory
);
572 cpu
->registers
[rn
] = T2H_8 (*(uword64
*)memory
);
578 sim_fetch_register (sd
,rn
,memory
)
581 unsigned char *memory
;
583 sim_cpu
*cpu
= STATE_CPU (sd
, 0);
584 /* NOTE: gdb (the client) stores registers in target byte order
585 while the simulator uses host byte order */
587 sim_io_printf(sd
,"sim_fetch_register(%d=0x%s,mem) : place simulator registers into memory\n",rn
,pr_addr(registers
[rn
]));
590 if (cpu
->register_widths
[rn
] == 0)
591 sim_io_eprintf(sd
,"Invalid register width for %d (register fetch ignored)\n",rn
);
592 /* start-sanitize-r5900 */
593 else if (rn
== REGISTER_SA
)
594 *((uword64
*)memory
) = H2T_8(SA
);
595 else if (rn
> LAST_EMBED_REGNUM
)
596 *((uword64
*)memory
) = H2T_8(cpu
->registers1
[rn
- LAST_EMBED_REGNUM
- 1]);
597 /* end-sanitize-r5900 */
598 else if (cpu
->register_widths
[rn
] == 32)
599 *((unsigned int *)memory
) = H2T_4 ((unsigned int)(cpu
->registers
[rn
] & 0xFFFFFFFF));
600 else /* 64bit register */
601 *((uword64
*)memory
) = H2T_8 (cpu
->registers
[rn
]);
608 sim_info (sd
,verbose
)
612 /* Accessed from the GDB "info files" command: */
613 if (STATE_VERBOSE_P (sd
) || verbose
)
616 sim_io_printf (sd
, "MIPS %d-bit %s endian simulator\n",
617 (PROCESSOR_64BIT
? 64 : 32),
618 (CURRENT_TARGET_BYTE_ORDER
== BIG_ENDIAN
? "Big" : "Little"));
620 #if !defined(FASTSIM)
621 /* It would be a useful feature, if when performing multi-cycle
622 simulations (rather than single-stepping) we keep the start and
623 end times of the execution, so that we can give a performance
624 figure for the simulator. */
625 #endif /* !FASTSIM */
626 sim_io_printf (sd
, "Number of execution cycles = %ld\n",
627 (long) sim_events_time (sd
));
629 /* print information pertaining to MIPS ISA and architecture being simulated */
630 /* things that may be interesting */
631 /* instructions executed - if available */
632 /* cycles executed - if available */
633 /* pipeline stalls - if available */
634 /* virtual time taken */
636 /* profiling frequency */
640 profile_print (sd
, STATE_VERBOSE_P (sd
), NULL
, NULL
);
645 sim_create_inferior (sd
, abfd
, argv
,env
)
653 printf("DBG: sim_create_inferior entered: start_address = 0x%s\n",
660 /* override PC value set by ColdReset () */
661 PC
= (unsigned64
) bfd_get_start_address (abfd
);
663 #if 0 /* def DEBUG */
666 /* We should really place the argv slot values into the argument
667 registers, and onto the stack as required. However, this
668 assumes that we have a stack defined, which is not
669 necessarily true at the moment. */
671 sim_io_printf(sd
,"sim_create_inferior() : passed arguments ignored\n");
672 for (cptr
= argv
; (cptr
&& *cptr
); cptr
++)
673 printf("DBG: arg \"%s\"\n",*cptr
);
681 sim_do_command (sd
,cmd
)
685 if (sim_args_command (sd
, cmd
) != SIM_RC_OK
)
686 sim_io_printf (sd
, "Error: \"%s\" is not a valid MIPS simulator command.\n",
690 /*---------------------------------------------------------------------------*/
691 /*-- Private simulator support interface ------------------------------------*/
692 /*---------------------------------------------------------------------------*/
694 /* Read a null terminated string from memory, return in a buffer */
703 while (sim_read (sd
, addr
+ nr
, &null
, 1) == 1 && null
!= 0)
705 buf
= NZALLOC (char, nr
+ 1);
706 sim_read (sd
, addr
, buf
, nr
);
710 /* Simple monitor interface (currently setup for the IDT and PMON monitors) */
712 sim_monitor(sd
,cia
,reason
)
718 printf("DBG: sim_monitor: entered (reason = %d)\n",reason
);
721 /* The IDT monitor actually allows two instructions per vector
722 slot. However, the simulator currently causes a trap on each
723 individual instruction. We cheat, and lose the bottom bit. */
726 /* The following callback functions are available, however the
727 monitor we are simulating does not make use of them: get_errno,
728 isatty, lseek, rename, system, time and unlink */
732 case 6: /* int open(char *path,int flags) */
734 char *path
= fetch_str (sd
, A0
);
735 V0
= sim_io_open (sd
, path
, (int)A1
);
740 case 7: /* int read(int file,char *ptr,int len) */
744 char *buf
= zalloc (nr
);
745 V0
= sim_io_read (sd
, fd
, buf
, nr
);
746 sim_write (sd
, A1
, buf
, nr
);
751 case 8: /* int write(int file,char *ptr,int len) */
755 char *buf
= zalloc (nr
);
756 sim_read (sd
, A1
, buf
, nr
);
757 V0
= sim_io_write (sd
, fd
, buf
, nr
);
762 case 10: /* int close(int file) */
764 V0
= sim_io_close (sd
, (int)A0
);
768 case 11: /* char inbyte(void) */
771 if (sim_io_read_stdin (sd
, &tmp
, sizeof(char)) != sizeof(char))
773 sim_io_error(sd
,"Invalid return from character read");
781 case 12: /* void outbyte(char chr) : write a byte to "stdout" */
783 char tmp
= (char)(A0
& 0xFF);
784 sim_io_write_stdout (sd
, &tmp
, sizeof(char));
788 case 17: /* void _exit() */
790 sim_io_eprintf (sd
, "sim_monitor(17): _exit(int reason) to be coded\n");
791 sim_engine_halt (sd
, STATE_CPU (sd
, 0), NULL
, NULL_CIA
, sim_exited
,
792 (unsigned int)(A0
& 0xFFFFFFFF));
796 case 28 : /* PMON flush_cache */
799 case 55: /* void get_mem_info(unsigned int *ptr) */
800 /* in: A0 = pointer to three word memory location */
801 /* out: [A0 + 0] = size */
802 /* [A0 + 4] = instruction cache size */
803 /* [A0 + 8] = data cache size */
805 address_word value
= MEM_SIZE
/* FIXME STATE_MEM_SIZE (sd) */;
807 sim_write (sd
, A0
, (char *)&value
, sizeof (value
));
808 /* sim_io_eprintf (sd, "sim: get_mem_info() depreciated\n"); */
812 case 158 : /* PMON printf */
813 /* in: A0 = pointer to format string */
814 /* A1 = optional argument 1 */
815 /* A2 = optional argument 2 */
816 /* A3 = optional argument 3 */
818 /* The following is based on the PMON printf source */
822 signed_word
*ap
= &A1
; /* 1st argument */
823 /* This isn't the quickest way, since we call the host print
824 routine for every character almost. But it does avoid
825 having to allocate and manage a temporary string buffer. */
826 /* TODO: Include check that we only use three arguments (A1,
828 while (sim_read (sd
, s
++, &c
, 1) && c
!= '\0')
833 enum {FMT_RJUST
, FMT_LJUST
, FMT_RJUST0
, FMT_CENTER
} fmt
= FMT_RJUST
;
834 int width
= 0, trunc
= 0, haddot
= 0, longlong
= 0;
835 while (sim_read (sd
, s
++, &c
, 1) && c
!= '\0')
837 if (strchr ("dobxXulscefg%", s
))
852 else if (c
>= '1' && c
<= '9')
856 while (sim_read (sd
, s
++, &c
, 1) == 1 && isdigit (c
))
859 n
= (unsigned int)strtol(tmp
,NULL
,10);
872 sim_io_printf (sd
, "%%");
877 address_word p
= *ap
++;
879 while (sim_read (sd
, p
++, &ch
, 1) == 1 && ch
!= '\0')
880 sim_io_printf(sd
, "%c", ch
);
883 sim_io_printf(sd
,"(null)");
886 sim_io_printf (sd
, "%c", (int)*ap
++);
891 sim_read (sd
, s
++, &c
, 1);
895 sim_read (sd
, s
++, &c
, 1);
898 if (strchr ("dobxXu", c
))
900 word64 lv
= (word64
) *ap
++;
902 sim_io_printf(sd
,"<binary not supported>");
905 sprintf (tmp
, "%%%s%c", longlong
? "ll" : "", c
);
907 sim_io_printf(sd
, tmp
, lv
);
909 sim_io_printf(sd
, tmp
, (int)lv
);
912 else if (strchr ("eEfgG", c
))
914 double dbl
= *(double*)(ap
++);
915 sprintf (tmp
, "%%%d.%d%c", width
, trunc
, c
);
916 sim_io_printf (sd
, tmp
, dbl
);
922 sim_io_printf(sd
, "%c", c
);
928 sim_io_error (sd
, "TODO: sim_monitor(%d) : PC = 0x%s\n",
929 reason
, pr_addr(cia
));
935 /* Store a word into memory. */
938 store_word (sd
, cia
, vaddr
, val
)
947 if ((vaddr
& 3) != 0)
948 SignalExceptionAddressStore ();
951 if (AddressTranslation (vaddr
, isDATA
, isSTORE
, &paddr
, &uncached
,
954 const uword64 mask
= 7;
958 paddr
= (paddr
& ~mask
) | ((paddr
& mask
) ^ (ReverseEndian
<< 2));
959 byte
= (vaddr
& mask
) ^ (BigEndianCPU
<< 2);
960 memval
= ((uword64
) val
) << (8 * byte
);
961 StoreMemory (uncached
, AccessLength_WORD
, memval
, 0, paddr
, vaddr
,
967 /* Load a word from memory. */
970 load_word (sd
, cia
, vaddr
)
975 if ((vaddr
& 3) != 0)
976 SignalExceptionAddressLoad ();
982 if (AddressTranslation (vaddr
, isDATA
, isLOAD
, &paddr
, &uncached
,
985 const uword64 mask
= 0x7;
986 const unsigned int reverse
= ReverseEndian
? 1 : 0;
987 const unsigned int bigend
= BigEndianCPU
? 1 : 0;
991 paddr
= (paddr
& ~mask
) | ((paddr
& mask
) ^ (reverse
<< 2));
992 LoadMemory (&memval
,NULL
,uncached
, AccessLength_WORD
, paddr
, vaddr
,
994 byte
= (vaddr
& mask
) ^ (bigend
<< 2);
995 return SIGNEXTEND (((memval
>> (8 * byte
)) & 0xffffffff), 32);
1002 /* Simulate the mips16 entry and exit pseudo-instructions. These
1003 would normally be handled by the reserved instruction exception
1004 code, but for ease of simulation we just handle them directly. */
1007 mips16_entry (sd
,insn
)
1011 int aregs
, sregs
, rreg
;
1014 printf("DBG: mips16_entry: entered (insn = 0x%08X)\n",insn
);
1017 aregs
= (insn
& 0x700) >> 8;
1018 sregs
= (insn
& 0x0c0) >> 6;
1019 rreg
= (insn
& 0x020) >> 5;
1021 /* This should be checked by the caller. */
1030 /* This is the entry pseudo-instruction. */
1032 for (i
= 0; i
< aregs
; i
++)
1033 store_word ((uword64
) (SP
+ 4 * i
), GPR
[i
+ 4]);
1041 store_word ((uword64
) tsp
, RA
);
1044 for (i
= 0; i
< sregs
; i
++)
1047 store_word ((uword64
) tsp
, GPR
[16 + i
]);
1055 /* This is the exit pseudo-instruction. */
1062 RA
= load_word ((uword64
) tsp
);
1065 for (i
= 0; i
< sregs
; i
++)
1068 GPR
[i
+ 16] = load_word ((uword64
) tsp
);
1076 FGR
[0] = WORD64LO (GPR
[4]);
1077 FPR_STATE
[0] = fmt_uninterpreted
;
1079 else if (aregs
== 6)
1081 FGR
[0] = WORD64LO (GPR
[5]);
1082 FGR
[1] = WORD64LO (GPR
[4]);
1083 FPR_STATE
[0] = fmt_uninterpreted
;
1084 FPR_STATE
[1] = fmt_uninterpreted
;
1086 #endif /* defined(HASFPU) */
1092 /*-- trace support ----------------------------------------------------------*/
1094 /* The TRACE support is provided (if required) in the memory accessing
1095 routines. Since we are also providing the architecture specific
1096 features, the architecture simulation code can also deal with
1097 notifying the TRACE world of cache flushes, etc. Similarly we do
1098 not need to provide profiling support in the simulator engine,
1099 since we can sample in the instruction fetch control loop. By
1100 defining the TRACE manifest, we add tracing as a run-time
1104 /* Tracing by default produces "din" format (as required by
1105 dineroIII). Each line of such a trace file *MUST* have a din label
1106 and address field. The rest of the line is ignored, so comments can
1107 be included if desired. The first field is the label which must be
1108 one of the following values:
1113 3 escape record (treated as unknown access type)
1114 4 escape record (causes cache flush)
1116 The address field is a 32bit (lower-case) hexadecimal address
1117 value. The address should *NOT* be preceded by "0x".
1119 The size of the memory transfer is not important when dealing with
1120 cache lines (as long as no more than a cache line can be
1121 transferred in a single operation :-), however more information
1122 could be given following the dineroIII requirement to allow more
1123 complete memory and cache simulators to provide better
1124 results. i.e. the University of Pisa has a cache simulator that can
1125 also take bus size and speed as (variable) inputs to calculate
1126 complete system performance (a much more useful ability when trying
1127 to construct an end product, rather than a processor). They
1128 currently have an ARM version of their tool called ChARM. */
1132 dotrace (SIM_DESC sd
,FILE *tracefh
,int type
,SIM_ADDR address
,int width
,char *comment
,...)
1134 if (STATE
& simTRACE
) {
1136 fprintf(tracefh
,"%d %s ; width %d ; ",
1140 va_start(ap
,comment
);
1141 vfprintf(tracefh
,comment
,ap
);
1143 fprintf(tracefh
,"\n");
1145 /* NOTE: Since the "din" format will only accept 32bit addresses, and
1146 we may be generating 64bit ones, we should put the hi-32bits of the
1147 address into the comment field. */
1149 /* TODO: Provide a buffer for the trace lines. We can then avoid
1150 performing writes until the buffer is filled, or the file is
1153 /* NOTE: We could consider adding a comment field to the "din" file
1154 produced using type 3 markers (unknown access). This would then
1155 allow information about the program that the "din" is for, and
1156 the MIPs world that was being simulated, to be placed into the
1163 /*---------------------------------------------------------------------------*/
1164 /*-- simulator engine -------------------------------------------------------*/
1165 /*---------------------------------------------------------------------------*/
1171 /* RESET: Fixed PC address: */
1172 PC
= UNSIGNED64 (0xFFFFFFFFBFC00000);
1173 /* The reset vector address is in the unmapped, uncached memory space. */
1175 SR
&= ~(status_SR
| status_TS
| status_RP
);
1176 SR
|= (status_ERL
| status_BEV
);
1178 /* Cheat and allow access to the complete register set immediately */
1179 if (CURRENT_FLOATING_POINT
== HARD_FLOATING_POINT
1180 && WITH_TARGET_WORD_BITSIZE
== 64)
1181 SR
|= status_FR
; /* 64bit registers */
1183 /* Ensure that any instructions with pending register updates are
1187 for (loop
= 0; (loop
< PSLOTS
); loop
++)
1188 PENDING_SLOT_REG
[loop
] = (LAST_EMBED_REGNUM
+ 1);
1189 PENDING_IN
= PENDING_OUT
= PENDING_TOTAL
= 0;
1192 /* Initialise the FPU registers to the unknown state */
1193 if (CURRENT_FLOATING_POINT
== HARD_FLOATING_POINT
)
1196 for (rn
= 0; (rn
< 32); rn
++)
1197 FPR_STATE
[rn
] = fmt_uninterpreted
;
1203 /* Description from page A-22 of the "MIPS IV Instruction Set" manual
1205 /* Translate a virtual address to a physical address and cache
1206 coherence algorithm describing the mechanism used to resolve the
1207 memory reference. Given the virtual address vAddr, and whether the
1208 reference is to Instructions ot Data (IorD), find the corresponding
1209 physical address (pAddr) and the cache coherence algorithm (CCA)
1210 used to resolve the reference. If the virtual address is in one of
1211 the unmapped address spaces the physical address and the CCA are
1212 determined directly by the virtual address. If the virtual address
1213 is in one of the mapped address spaces then the TLB is used to
1214 determine the physical address and access type; if the required
1215 translation is not present in the TLB or the desired access is not
1216 permitted the function fails and an exception is taken.
1218 NOTE: Normally (RAW == 0), when address translation fails, this
1219 function raises an exception and does not return. */
1222 address_translation(sd
,cia
,vAddr
,IorD
,LorS
,pAddr
,CCA
,raw
)
1228 address_word
*pAddr
;
1232 int res
= -1; /* TRUE : Assume good return */
1235 sim_io_printf(sd
,"AddressTranslation(0x%s,%s,%s,...);\n",pr_addr(vAddr
),(IorD
? "isDATA" : "isINSTRUCTION"),(LorS
? "iSTORE" : "isLOAD"));
1238 /* Check that the address is valid for this memory model */
1240 /* For a simple (flat) memory model, we simply pass virtual
1241 addressess through (mostly) unchanged. */
1242 vAddr
&= 0xFFFFFFFF;
1244 *pAddr
= vAddr
; /* default for isTARGET */
1245 *CCA
= Uncached
; /* not used for isHOST */
1250 /* Description from page A-23 of the "MIPS IV Instruction Set" manual
1252 /* Prefetch data from memory. Prefetch is an advisory instruction for
1253 which an implementation specific action is taken. The action taken
1254 may increase performance, but must not change the meaning of the
1255 program, or alter architecturally-visible state. */
1258 prefetch(sd
,cia
,CCA
,pAddr
,vAddr
,DATA
,hint
)
1268 sim_io_printf(sd
,"Prefetch(%d,0x%s,0x%s,%d,%d);\n",CCA
,pr_addr(pAddr
),pr_addr(vAddr
),DATA
,hint
);
1271 /* For our simple memory model we do nothing */
1275 /* Description from page A-22 of the "MIPS IV Instruction Set" manual
1277 /* Load a value from memory. Use the cache and main memory as
1278 specified in the Cache Coherence Algorithm (CCA) and the sort of
1279 access (IorD) to find the contents of AccessLength memory bytes
1280 starting at physical location pAddr. The data is returned in the
1281 fixed width naturally-aligned memory element (MemElem). The
1282 low-order two (or three) bits of the address and the AccessLength
1283 indicate which of the bytes within MemElem needs to be given to the
1284 processor. If the memory access type of the reference is uncached
1285 then only the referenced bytes are read from memory and valid
1286 within the memory element. If the access type is cached, and the
1287 data is not present in cache, an implementation specific size and
1288 alignment block of memory is read and loaded into the cache to
1289 satisfy a load reference. At a minimum, the block is the entire
1292 load_memory(sd
,cia
,memvalp
,memval1p
,CCA
,AccessLength
,pAddr
,vAddr
,IorD
)
1307 sim_io_printf(sd
,"DBG: LoadMemory(%p,%p,%d,%d,0x%s,0x%s,%s)\n",memvalp
,memval1p
,CCA
,AccessLength
,pr_addr(pAddr
),pr_addr(vAddr
),(IorD
? "isDATA" : "isINSTRUCTION"));
1310 #if defined(WARN_MEM)
1311 if (CCA
!= uncached
)
1312 sim_io_eprintf(sd
,"LoadMemory CCA (%d) is not uncached (currently all accesses treated as cached)\n",CCA
);
1313 #endif /* WARN_MEM */
1315 /* If instruction fetch then we need to check that the two lo-order
1316 bits are zero, otherwise raise a InstructionFetch exception: */
1317 if ((IorD
== isINSTRUCTION
)
1318 && ((pAddr
& 0x3) != 0)
1319 && (((pAddr
& 0x1) != 0) || ((vAddr
& 0x1) == 0)))
1320 SignalExceptionInstructionFetch ();
1322 if (((pAddr
& LOADDRMASK
) + AccessLength
) > LOADDRMASK
)
1324 /* In reality this should be a Bus Error */
1325 sim_io_error (sd
, "AccessLength of %d would extend over %dbit aligned boundary for physical address 0x%s\n",
1327 (LOADDRMASK
+ 1) << 2,
1332 dotrace(sd
,tracefh
,((IorD
== isDATA
) ? 0 : 2),(unsigned int)(pAddr
&0xFFFFFFFF),(AccessLength
+ 1),"load%s",((IorD
== isDATA
) ? "" : " instruction"));
1335 /* Read the specified number of bytes from memory. Adjust for
1336 host/target byte ordering/ Align the least significant byte
1339 switch (AccessLength
)
1341 case AccessLength_QUADWORD
:
1343 unsigned_16 val
= sim_core_read_aligned_16 (STATE_CPU (sd
, 0), NULL_CIA
,
1344 sim_core_read_map
, pAddr
);
1345 value1
= VH8_16 (val
);
1346 value
= VL8_16 (val
);
1349 case AccessLength_DOUBLEWORD
:
1350 value
= sim_core_read_aligned_8 (STATE_CPU (sd
, 0), NULL_CIA
,
1351 sim_core_read_map
, pAddr
);
1353 case AccessLength_SEPTIBYTE
:
1354 value
= sim_core_read_misaligned_7 (STATE_CPU (sd
, 0), NULL_CIA
,
1355 sim_core_read_map
, pAddr
);
1356 case AccessLength_SEXTIBYTE
:
1357 value
= sim_core_read_misaligned_6 (STATE_CPU (sd
, 0), NULL_CIA
,
1358 sim_core_read_map
, pAddr
);
1359 case AccessLength_QUINTIBYTE
:
1360 value
= sim_core_read_misaligned_5 (STATE_CPU (sd
, 0), NULL_CIA
,
1361 sim_core_read_map
, pAddr
);
1362 case AccessLength_WORD
:
1363 value
= sim_core_read_aligned_4 (STATE_CPU (sd
, 0), NULL_CIA
,
1364 sim_core_read_map
, pAddr
);
1366 case AccessLength_TRIPLEBYTE
:
1367 value
= sim_core_read_misaligned_3 (STATE_CPU (sd
, 0), NULL_CIA
,
1368 sim_core_read_map
, pAddr
);
1369 case AccessLength_HALFWORD
:
1370 value
= sim_core_read_aligned_2 (STATE_CPU (sd
, 0), NULL_CIA
,
1371 sim_core_read_map
, pAddr
);
1373 case AccessLength_BYTE
:
1374 value
= sim_core_read_aligned_1 (STATE_CPU (sd
, 0), NULL_CIA
,
1375 sim_core_read_map
, pAddr
);
1382 printf("DBG: LoadMemory() : (offset %d) : value = 0x%s%s\n",
1383 (int)(pAddr
& LOADDRMASK
),pr_uword64(value1
),pr_uword64(value
));
1386 /* See also store_memory. */
1387 if (AccessLength
<= AccessLength_DOUBLEWORD
)
1390 /* for big endian target, byte (pAddr&LOADDRMASK == 0) is
1391 shifted to the most significant byte position. */
1392 value
<<= (((7 - (pAddr
& LOADDRMASK
)) - AccessLength
) * 8);
1394 /* For little endian target, byte (pAddr&LOADDRMASK == 0)
1395 is already in the correct postition. */
1396 value
<<= ((pAddr
& LOADDRMASK
) * 8);
1400 printf("DBG: LoadMemory() : shifted value = 0x%s%s\n",
1401 pr_uword64(value1
),pr_uword64(value
));
1405 if (memval1p
) *memval1p
= value1
;
1409 /* Description from page A-23 of the "MIPS IV Instruction Set" manual
1411 /* Store a value to memory. The specified data is stored into the
1412 physical location pAddr using the memory hierarchy (data caches and
1413 main memory) as specified by the Cache Coherence Algorithm
1414 (CCA). The MemElem contains the data for an aligned, fixed-width
1415 memory element (word for 32-bit processors, doubleword for 64-bit
1416 processors), though only the bytes that will actually be stored to
1417 memory need to be valid. The low-order two (or three) bits of pAddr
1418 and the AccessLength field indicates which of the bytes within the
1419 MemElem data should actually be stored; only these bytes in memory
1423 store_memory(sd
,cia
,CCA
,AccessLength
,MemElem
,MemElem1
,pAddr
,vAddr
)
1429 uword64 MemElem1
; /* High order 64 bits */
1434 sim_io_printf(sd
,"DBG: StoreMemory(%d,%d,0x%s,0x%s,0x%s,0x%s)\n",CCA
,AccessLength
,pr_uword64(MemElem
),pr_uword64(MemElem1
),pr_addr(pAddr
),pr_addr(vAddr
));
1437 #if defined(WARN_MEM)
1438 if (CCA
!= uncached
)
1439 sim_io_eprintf(sd
,"StoreMemory CCA (%d) is not uncached (currently all accesses treated as cached)\n",CCA
);
1440 #endif /* WARN_MEM */
1442 if (((pAddr
& LOADDRMASK
) + AccessLength
) > LOADDRMASK
)
1443 sim_io_error(sd
,"AccessLength of %d would extend over %dbit aligned boundary for physical address 0x%s\n",AccessLength
,(LOADDRMASK
+ 1)<<2,pr_addr(pAddr
));
1446 dotrace(sd
,tracefh
,1,(unsigned int)(pAddr
&0xFFFFFFFF),(AccessLength
+ 1),"store");
1450 printf("DBG: StoreMemory: offset = %d MemElem = 0x%s%s\n",(unsigned int)(pAddr
& LOADDRMASK
),pr_uword64(MemElem1
),pr_uword64(MemElem
));
1453 /* See also load_memory */
1454 if (AccessLength
<= AccessLength_DOUBLEWORD
)
1457 /* for big endian target, byte (pAddr&LOADDRMASK == 0) is
1458 shifted to the most significant byte position. */
1459 MemElem
>>= (((7 - (pAddr
& LOADDRMASK
)) - AccessLength
) * 8);
1461 /* For little endian target, byte (pAddr&LOADDRMASK == 0)
1462 is already in the correct postition. */
1463 MemElem
>>= ((pAddr
& LOADDRMASK
) * 8);
1467 printf("DBG: StoreMemory: shift = %d MemElem = 0x%s%s\n",shift
,pr_uword64(MemElem1
),pr_uword64(MemElem
));
1470 switch (AccessLength
)
1472 case AccessLength_QUADWORD
:
1474 unsigned_16 val
= U16_8 (MemElem1
, MemElem
);
1475 sim_core_write_aligned_16 (STATE_CPU (sd
, 0), NULL_CIA
,
1476 sim_core_write_map
, pAddr
, val
);
1479 case AccessLength_DOUBLEWORD
:
1480 sim_core_write_aligned_8 (STATE_CPU (sd
, 0), NULL_CIA
,
1481 sim_core_write_map
, pAddr
, MemElem
);
1483 case AccessLength_SEPTIBYTE
:
1484 sim_core_write_misaligned_7 (STATE_CPU (sd
, 0), NULL_CIA
,
1485 sim_core_write_map
, pAddr
, MemElem
);
1487 case AccessLength_SEXTIBYTE
:
1488 sim_core_write_misaligned_6 (STATE_CPU (sd
, 0), NULL_CIA
,
1489 sim_core_write_map
, pAddr
, MemElem
);
1491 case AccessLength_QUINTIBYTE
:
1492 sim_core_write_misaligned_5 (STATE_CPU (sd
, 0), NULL_CIA
,
1493 sim_core_write_map
, pAddr
, MemElem
);
1495 case AccessLength_WORD
:
1496 sim_core_write_aligned_4 (STATE_CPU (sd
, 0), NULL_CIA
,
1497 sim_core_write_map
, pAddr
, MemElem
);
1499 case AccessLength_TRIPLEBYTE
:
1500 sim_core_write_misaligned_3 (STATE_CPU (sd
, 0), NULL_CIA
,
1501 sim_core_write_map
, pAddr
, MemElem
);
1503 case AccessLength_HALFWORD
:
1504 sim_core_write_aligned_2 (STATE_CPU (sd
, 0), NULL_CIA
,
1505 sim_core_write_map
, pAddr
, MemElem
);
1507 case AccessLength_BYTE
:
1508 sim_core_write_aligned_1 (STATE_CPU (sd
, 0), NULL_CIA
,
1509 sim_core_write_map
, pAddr
, MemElem
);
1520 ifetch32 (SIM_DESC sd
,
1524 /* Copy the action of the LW instruction */
1525 address_word reverse
= (ReverseEndian
? (LOADDRMASK
>> 2) : 0);
1526 address_word bigend
= (BigEndianCPU
? (LOADDRMASK
>> 2) : 0);
1529 unsigned32 instruction
;
1532 AddressTranslation (vaddr
, isINSTRUCTION
, isLOAD
, &paddr
, &cca
, isTARGET
, isREAL
);
1533 paddr
= ((paddr
& ~LOADDRMASK
) | ((paddr
& LOADDRMASK
) ^ (reverse
<< 2)));
1534 LoadMemory (&value
, NULL
, cca
, AccessLength_WORD
, paddr
, vaddr
, isINSTRUCTION
, isREAL
);
1535 byte
= ((vaddr
& LOADDRMASK
) ^ (bigend
<< 2));
1536 instruction
= ((value
>> (8 * byte
)) & 0xFFFFFFFF);
1541 /* Description from page A-26 of the "MIPS IV Instruction Set" manual (revision 3.1) */
1542 /* Order loads and stores to synchronise shared memory. Perform the
1543 action necessary to make the effects of groups of synchronizable
1544 loads and stores indicated by stype occur in the same order for all
1547 sync_operation(sd
,cia
,stype
)
1553 sim_io_printf(sd
,"SyncOperation(%d) : TODO\n",stype
);
1558 /* Description from page A-26 of the "MIPS IV Instruction Set" manual (revision 3.1) */
1559 /* Signal an exception condition. This will result in an exception
1560 that aborts the instruction. The instruction operation pseudocode
1561 will never see a return from this function call. */
1564 signal_exception (SIM_DESC sd
,
1571 sim_io_printf(sd
,"DBG: SignalException(%d) PC = 0x%s\n",exception
,pr_addr(cia
));
1574 /* Ensure that any active atomic read/modify/write operation will fail: */
1577 switch (exception
) {
1578 /* TODO: For testing purposes I have been ignoring TRAPs. In
1579 reality we should either simulate them, or allow the user to
1580 ignore them at run-time.
1583 sim_io_eprintf(sd
,"Ignoring instruction TRAP (PC 0x%s)\n",pr_addr(cia
));
1589 unsigned int instruction
;
1592 va_start(ap
,exception
);
1593 instruction
= va_arg(ap
,unsigned int);
1596 code
= (instruction
>> 6) & 0xFFFFF;
1598 sim_io_eprintf(sd
,"Ignoring instruction `syscall %d' (PC 0x%s)\n",
1599 code
, pr_addr(cia
));
1603 case DebugBreakPoint
:
1604 if (! (Debug
& Debug_DM
))
1610 Debug
|= Debug_DBD
; /* signaled from within in delay slot */
1611 DEPC
= cia
- 4; /* reference the branch instruction */
1615 Debug
&= ~Debug_DBD
; /* not signaled from within a delay slot */
1619 Debug
|= Debug_DM
; /* in debugging mode */
1620 Debug
|= Debug_DBp
; /* raising a DBp exception */
1622 sim_engine_restart (sd
, STATE_CPU (sd
, 0), NULL
, NULL_CIA
);
1626 case ReservedInstruction
:
1629 unsigned int instruction
;
1630 va_start(ap
,exception
);
1631 instruction
= va_arg(ap
,unsigned int);
1633 /* Provide simple monitor support using ReservedInstruction
1634 exceptions. The following code simulates the fixed vector
1635 entry points into the IDT monitor by causing a simulator
1636 trap, performing the monitor operation, and returning to
1637 the address held in the $ra register (standard PCS return
1638 address). This means we only need to pre-load the vector
1639 space with suitable instruction values. For systems were
1640 actual trap instructions are used, we would not need to
1641 perform this magic. */
1642 if ((instruction
& RSVD_INSTRUCTION_MASK
) == RSVD_INSTRUCTION
)
1644 sim_monitor(sd
, cia
, ((instruction
>> RSVD_INSTRUCTION_ARG_SHIFT
) & RSVD_INSTRUCTION_ARG_MASK
) );
1645 /* NOTE: This assumes that a branch-and-link style
1646 instruction was used to enter the vector (which is the
1647 case with the current IDT monitor). */
1648 sim_engine_restart (sd
, STATE_CPU (sd
, 0), NULL
, RA
);
1650 /* Look for the mips16 entry and exit instructions, and
1651 simulate a handler for them. */
1652 else if ((cia
& 1) != 0
1653 && (instruction
& 0xf81f) == 0xe809
1654 && (instruction
& 0x0c0) != 0x0c0)
1656 mips16_entry (instruction
);
1657 sim_engine_restart (sd
, NULL
, NULL
, NULL_CIA
);
1659 /* else fall through to normal exception processing */
1660 sim_io_eprintf(sd
,"ReservedInstruction 0x%08X at PC = 0x%s\n",instruction
,pr_addr(cia
));
1665 sim_io_printf(sd
,"DBG: SignalException(%d) PC = 0x%s\n",exception
,pr_addr(cia
));
1667 /* Keep a copy of the current A0 in-case this is the program exit
1671 unsigned int instruction
;
1672 va_start(ap
,exception
);
1673 instruction
= va_arg(ap
,unsigned int);
1675 /* Check for our special terminating BREAK: */
1676 if ((instruction
& 0x03FFFFC0) == 0x03ff0000) {
1677 sim_engine_halt (sd
, STATE_CPU (sd
, 0), NULL
, cia
,
1678 sim_exited
, (unsigned int)(A0
& 0xFFFFFFFF));
1681 if (STATE
& simDELAYSLOT
)
1682 PC
= cia
- 4; /* reference the branch instruction */
1685 sim_engine_halt (sd
, STATE_CPU (sd
, 0), NULL
, cia
,
1686 sim_stopped
, SIGTRAP
);
1689 /* Store exception code into current exception id variable (used
1692 /* TODO: If not simulating exceptions then stop the simulator
1693 execution. At the moment we always stop the simulation. */
1695 /* See figure 5-17 for an outline of the code below */
1696 if (! (SR
& status_EXL
))
1698 CAUSE
= (exception
<< 2);
1699 if (STATE
& simDELAYSLOT
)
1701 STATE
&= ~simDELAYSLOT
;
1703 EPC
= (cia
- 4); /* reference the branch instruction */
1707 /* FIXME: TLB et.al. */
1712 CAUSE
= (exception
<< 2);
1716 /* Store exception code into current exception id variable (used
1718 if (SR
& status_BEV
)
1719 PC
= (signed)0xBFC00200 + 0x180;
1721 PC
= (signed)0x80000000 + 0x180;
1723 switch ((CAUSE
>> 2) & 0x1F)
1726 /* Interrupts arrive during event processing, no need to
1730 case TLBModification
:
1735 case InstructionFetch
:
1737 /* The following is so that the simulator will continue from the
1738 exception address on breakpoint operations. */
1740 sim_engine_halt (sd
, STATE_CPU (sd
, 0), NULL
, NULL_CIA
,
1741 sim_stopped
, SIGBUS
);
1743 case ReservedInstruction
:
1744 case CoProcessorUnusable
:
1746 sim_engine_halt (sd
, STATE_CPU (sd
, 0), NULL
, NULL_CIA
,
1747 sim_stopped
, SIGILL
);
1749 case IntegerOverflow
:
1751 sim_engine_halt (sd
, STATE_CPU (sd
, 0), NULL
, NULL_CIA
,
1752 sim_stopped
, SIGFPE
);
1758 sim_engine_halt (sd
, STATE_CPU (sd
, 0), NULL
, NULL_CIA
,
1759 sim_stopped
, SIGTRAP
);
1763 sim_engine_abort (sd
, STATE_CPU (sd
, 0), NULL_CIA
,
1764 "FATAL: Should not encounter a breakpoint\n");
1766 default : /* Unknown internal exception */
1768 sim_engine_halt (sd
, STATE_CPU (sd
, 0), NULL
, NULL_CIA
,
1769 sim_stopped
, SIGQUIT
);
1773 case SimulatorFault
:
1777 va_start(ap
,exception
);
1778 msg
= va_arg(ap
,char *);
1780 sim_engine_abort (sd
, STATE_CPU (sd
, 0), NULL_CIA
,
1781 "FATAL: Simulator error \"%s\"\n",msg
);
1788 #if defined(WARN_RESULT)
1789 /* Description from page A-26 of the "MIPS IV Instruction Set" manual (revision 3.1) */
1790 /* This function indicates that the result of the operation is
1791 undefined. However, this should not affect the instruction
1792 stream. All that is meant to happen is that the destination
1793 register is set to an undefined result. To keep the simulator
1794 simple, we just don't bother updating the destination register, so
1795 the overall result will be undefined. If desired we can stop the
1796 simulator by raising a pseudo-exception. */
1797 #define UndefinedResult() undefined_result (sd,cia)
1799 undefined_result(sd
,cia
)
1803 sim_io_eprintf(sd
,"UndefinedResult: PC = 0x%s\n",pr_addr(cia
));
1804 #if 0 /* Disabled for the moment, since it actually happens a lot at the moment. */
1809 #endif /* WARN_RESULT */
1812 cache_op(sd
,cia
,op
,pAddr
,vAddr
,instruction
)
1818 unsigned int instruction
;
1820 #if 1 /* stop warning message being displayed (we should really just remove the code) */
1821 static int icache_warning
= 1;
1822 static int dcache_warning
= 1;
1824 static int icache_warning
= 0;
1825 static int dcache_warning
= 0;
1828 /* If CP0 is not useable (User or Supervisor mode) and the CP0
1829 enable bit in the Status Register is clear - a coprocessor
1830 unusable exception is taken. */
1832 sim_io_printf(sd
,"TODO: Cache availability checking (PC = 0x%s)\n",pr_addr(cia
));
1836 case 0: /* instruction cache */
1838 case 0: /* Index Invalidate */
1839 case 1: /* Index Load Tag */
1840 case 2: /* Index Store Tag */
1841 case 4: /* Hit Invalidate */
1843 case 6: /* Hit Writeback */
1844 if (!icache_warning
)
1846 sim_io_eprintf(sd
,"Instruction CACHE operation %d to be coded\n",(op
>> 2));
1852 SignalException(ReservedInstruction
,instruction
);
1857 case 1: /* data cache */
1859 case 0: /* Index Writeback Invalidate */
1860 case 1: /* Index Load Tag */
1861 case 2: /* Index Store Tag */
1862 case 3: /* Create Dirty */
1863 case 4: /* Hit Invalidate */
1864 case 5: /* Hit Writeback Invalidate */
1865 case 6: /* Hit Writeback */
1866 if (!dcache_warning
)
1868 sim_io_eprintf(sd
,"Data CACHE operation %d to be coded\n",(op
>> 2));
1874 SignalException(ReservedInstruction
,instruction
);
1879 default: /* unrecognised cache ID */
1880 SignalException(ReservedInstruction
,instruction
);
1887 /*-- FPU support routines ---------------------------------------------------*/
1889 #if defined(HASFPU) /* Only needed when building FPU aware simulators */
1891 /* Numbers are held in normalized form. The SINGLE and DOUBLE binary
1892 formats conform to ANSI/IEEE Std 754-1985. */
1893 /* SINGLE precision floating:
1894 * seeeeeeeefffffffffffffffffffffff
1896 * e = 8bits = exponent
1897 * f = 23bits = fraction
1899 /* SINGLE precision fixed:
1900 * siiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
1902 * i = 31bits = integer
1904 /* DOUBLE precision floating:
1905 * seeeeeeeeeeeffffffffffffffffffffffffffffffffffffffffffffffffffff
1907 * e = 11bits = exponent
1908 * f = 52bits = fraction
1910 /* DOUBLE precision fixed:
1911 * siiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii
1913 * i = 63bits = integer
1916 /* Extract sign-bit: */
1917 #define FP_S_s(v) (((v) & ((unsigned)1 << 31)) ? 1 : 0)
1918 #define FP_D_s(v) (((v) & ((uword64)1 << 63)) ? 1 : 0)
1919 /* Extract biased exponent: */
1920 #define FP_S_be(v) (((v) >> 23) & 0xFF)
1921 #define FP_D_be(v) (((v) >> 52) & 0x7FF)
1922 /* Extract unbiased Exponent: */
1923 #define FP_S_e(v) (FP_S_be(v) - 0x7F)
1924 #define FP_D_e(v) (FP_D_be(v) - 0x3FF)
1925 /* Extract complete fraction field: */
1926 #define FP_S_f(v) ((v) & ~((unsigned)0x1FF << 23))
1927 #define FP_D_f(v) ((v) & ~((uword64)0xFFF << 52))
1928 /* Extract numbered fraction bit: */
1929 #define FP_S_fb(b,v) (((v) & (1 << (23 - (b)))) ? 1 : 0)
1930 #define FP_D_fb(b,v) (((v) & (1 << (52 - (b)))) ? 1 : 0)
1932 /* Explicit QNaN values used when value required: */
1933 #define FPQNaN_SINGLE (0x7FBFFFFF)
1934 #define FPQNaN_WORD (0x7FFFFFFF)
1935 #define FPQNaN_DOUBLE (((uword64)0x7FF7FFFF << 32) | 0xFFFFFFFF)
1936 #define FPQNaN_LONG (((uword64)0x7FFFFFFF << 32) | 0xFFFFFFFF)
1938 /* Explicit Infinity values used when required: */
1939 #define FPINF_SINGLE (0x7F800000)
1940 #define FPINF_DOUBLE (((uword64)0x7FF00000 << 32) | 0x00000000)
1942 #if 1 /* def DEBUG */
1943 #define RMMODE(v) (((v) == FP_RM_NEAREST) ? "Round" : (((v) == FP_RM_TOZERO) ? "Trunc" : (((v) == FP_RM_TOPINF) ? "Ceil" : "Floor")))
1944 #define DOFMT(v) (((v) == fmt_single) ? "single" : (((v) == fmt_double) ? "double" : (((v) == fmt_word) ? "word" : (((v) == fmt_long) ? "long" : (((v) == fmt_unknown) ? "<unknown>" : (((v) == fmt_uninterpreted) ? "<uninterpreted>" : "<format error>"))))))
1948 value_fpr(sd
,cia
,fpr
,fmt
)
1957 /* Treat unused register values, as fixed-point 64bit values: */
1958 if ((fmt
== fmt_uninterpreted
) || (fmt
== fmt_unknown
))
1960 /* If request to read data as "uninterpreted", then use the current
1962 fmt
= FPR_STATE
[fpr
];
1967 /* For values not yet accessed, set to the desired format: */
1968 if (FPR_STATE
[fpr
] == fmt_uninterpreted
) {
1969 FPR_STATE
[fpr
] = fmt
;
1971 printf("DBG: Register %d was fmt_uninterpreted. Now %s\n",fpr
,DOFMT(fmt
));
1974 if (fmt
!= FPR_STATE
[fpr
]) {
1975 sim_io_eprintf(sd
,"FPR %d (format %s) being accessed with format %s - setting to unknown (PC = 0x%s)\n",fpr
,DOFMT(FPR_STATE
[fpr
]),DOFMT(fmt
),pr_addr(cia
));
1976 FPR_STATE
[fpr
] = fmt_unknown
;
1979 if (FPR_STATE
[fpr
] == fmt_unknown
) {
1980 /* Set QNaN value: */
1983 value
= FPQNaN_SINGLE
;
1987 value
= FPQNaN_DOUBLE
;
1991 value
= FPQNaN_WORD
;
1995 value
= FPQNaN_LONG
;
2002 } else if (SizeFGR() == 64) {
2006 value
= (FGR
[fpr
] & 0xFFFFFFFF);
2009 case fmt_uninterpreted
:
2023 value
= (FGR
[fpr
] & 0xFFFFFFFF);
2026 case fmt_uninterpreted
:
2029 if ((fpr
& 1) == 0) { /* even registers only */
2030 value
= ((((uword64
)FGR
[fpr
+1]) << 32) | (FGR
[fpr
] & 0xFFFFFFFF));
2032 SignalException(ReservedInstruction
,0);
2043 SignalExceptionSimulatorFault ("Unrecognised FP format in ValueFPR()");
2046 printf("DBG: ValueFPR: fpr = %d, fmt = %s, value = 0x%s : PC = 0x%s : SizeFGR() = %d\n",fpr
,DOFMT(fmt
),pr_addr(value
),pr_addr(cia
),SizeFGR());
2053 store_fpr(sd
,cia
,fpr
,fmt
,value
)
2063 printf("DBG: StoreFPR: fpr = %d, fmt = %s, value = 0x%s : PC = 0x%s : SizeFGR() = %d\n",fpr
,DOFMT(fmt
),pr_addr(value
),pr_addr(cia
),SizeFGR());
2066 if (SizeFGR() == 64) {
2070 FGR
[fpr
] = (((uword64
)0xDEADC0DE << 32) | (value
& 0xFFFFFFFF));
2071 FPR_STATE
[fpr
] = fmt
;
2074 case fmt_uninterpreted
:
2078 FPR_STATE
[fpr
] = fmt
;
2082 FPR_STATE
[fpr
] = fmt_unknown
;
2090 FGR
[fpr
] = (value
& 0xFFFFFFFF);
2091 FPR_STATE
[fpr
] = fmt
;
2094 case fmt_uninterpreted
:
2097 if ((fpr
& 1) == 0) { /* even register number only */
2098 FGR
[fpr
+1] = (value
>> 32);
2099 FGR
[fpr
] = (value
& 0xFFFFFFFF);
2100 FPR_STATE
[fpr
+ 1] = fmt
;
2101 FPR_STATE
[fpr
] = fmt
;
2103 FPR_STATE
[fpr
] = fmt_unknown
;
2104 FPR_STATE
[fpr
+ 1] = fmt_unknown
;
2105 SignalException(ReservedInstruction
,0);
2110 FPR_STATE
[fpr
] = fmt_unknown
;
2115 #if defined(WARN_RESULT)
2118 #endif /* WARN_RESULT */
2121 SignalExceptionSimulatorFault ("Unrecognised FP format in StoreFPR()");
2124 printf("DBG: StoreFPR: fpr[%d] = 0x%s (format %s)\n",fpr
,pr_addr(FGR
[fpr
]),DOFMT(fmt
));
2137 /* Check if (((E - bias) == (E_max + 1)) && (fraction != 0)). We
2138 know that the exponent field is biased... we we cheat and avoid
2139 removing the bias value. */
2142 boolean
= ((FP_S_be(op
) == 0xFF) && (FP_S_f(op
) != 0));
2143 /* We could use "FP_S_fb(1,op)" to ascertain whether we are
2144 dealing with a SNaN or QNaN */
2147 boolean
= ((FP_D_be(op
) == 0x7FF) && (FP_D_f(op
) != 0));
2148 /* We could use "FP_S_fb(1,op)" to ascertain whether we are
2149 dealing with a SNaN or QNaN */
2152 boolean
= (op
== FPQNaN_WORD
);
2155 boolean
= (op
== FPQNaN_LONG
);
2158 fprintf (stderr
, "Bad switch\n");
2163 printf("DBG: NaN: returning %d for 0x%s (format = %s)\n",boolean
,pr_addr(op
),DOFMT(fmt
));
2177 printf("DBG: Infinity: format %s 0x%s\n",DOFMT(fmt
),pr_addr(op
));
2180 /* Check if (((E - bias) == (E_max + 1)) && (fraction == 0)). We
2181 know that the exponent field is biased... we we cheat and avoid
2182 removing the bias value. */
2185 boolean
= ((FP_S_be(op
) == 0xFF) && (FP_S_f(op
) == 0));
2188 boolean
= ((FP_D_be(op
) == 0x7FF) && (FP_D_f(op
) == 0));
2191 printf("DBG: TODO: unrecognised format (%s) for Infinity check\n",DOFMT(fmt
));
2196 printf("DBG: Infinity: returning %d for 0x%s (format = %s)\n",boolean
,pr_addr(op
),DOFMT(fmt
));
2210 /* Argument checking already performed by the FPCOMPARE code */
2213 printf("DBG: Less: %s: op1 = 0x%s : op2 = 0x%s\n",DOFMT(fmt
),pr_addr(op1
),pr_addr(op2
));
2216 /* The format type should already have been checked: */
2220 unsigned int wop1
= (unsigned int)op1
;
2221 unsigned int wop2
= (unsigned int)op2
;
2222 boolean
= (*(float *)&wop1
< *(float *)&wop2
);
2226 boolean
= (*(double *)&op1
< *(double *)&op2
);
2229 fprintf (stderr
, "Bad switch\n");
2234 printf("DBG: Less: returning %d (format = %s)\n",boolean
,DOFMT(fmt
));
2248 /* Argument checking already performed by the FPCOMPARE code */
2251 printf("DBG: Equal: %s: op1 = 0x%s : op2 = 0x%s\n",DOFMT(fmt
),pr_addr(op1
),pr_addr(op2
));
2254 /* The format type should already have been checked: */
2257 boolean
= ((op1
& 0xFFFFFFFF) == (op2
& 0xFFFFFFFF));
2260 boolean
= (op1
== op2
);
2263 fprintf (stderr
, "Bad switch\n");
2268 printf("DBG: Equal: returning %d (format = %s)\n",boolean
,DOFMT(fmt
));
2275 AbsoluteValue(op
,fmt
)
2282 printf("DBG: AbsoluteValue: %s: op = 0x%s\n",DOFMT(fmt
),pr_addr(op
));
2285 /* The format type should already have been checked: */
2289 unsigned int wop
= (unsigned int)op
;
2290 float tmp
= ((float)fabs((double)*(float *)&wop
));
2291 result
= (uword64
)*(unsigned int *)&tmp
;
2296 double tmp
= (fabs(*(double *)&op
));
2297 result
= *(uword64
*)&tmp
;
2300 fprintf (stderr
, "Bad switch\n");
2315 printf("DBG: Negate: %s: op = 0x%s\n",DOFMT(fmt
),pr_addr(op
));
2318 /* The format type should already have been checked: */
2322 unsigned int wop
= (unsigned int)op
;
2323 float tmp
= ((float)0.0 - *(float *)&wop
);
2324 result
= (uword64
)*(unsigned int *)&tmp
;
2329 double tmp
= ((double)0.0 - *(double *)&op
);
2330 result
= *(uword64
*)&tmp
;
2334 fprintf (stderr
, "Bad switch\n");
2350 printf("DBG: Add: %s: op1 = 0x%s : op2 = 0x%s\n",DOFMT(fmt
),pr_addr(op1
),pr_addr(op2
));
2353 /* The registers must specify FPRs valid for operands of type
2354 "fmt". If they are not valid, the result is undefined. */
2356 /* The format type should already have been checked: */
2360 unsigned int wop1
= (unsigned int)op1
;
2361 unsigned int wop2
= (unsigned int)op2
;
2362 float tmp
= (*(float *)&wop1
+ *(float *)&wop2
);
2363 result
= (uword64
)*(unsigned int *)&tmp
;
2368 double tmp
= (*(double *)&op1
+ *(double *)&op2
);
2369 result
= *(uword64
*)&tmp
;
2373 fprintf (stderr
, "Bad switch\n");
2378 printf("DBG: Add: returning 0x%s (format = %s)\n",pr_addr(result
),DOFMT(fmt
));
2393 printf("DBG: Sub: %s: op1 = 0x%s : op2 = 0x%s\n",DOFMT(fmt
),pr_addr(op1
),pr_addr(op2
));
2396 /* The registers must specify FPRs valid for operands of type
2397 "fmt". If they are not valid, the result is undefined. */
2399 /* The format type should already have been checked: */
2403 unsigned int wop1
= (unsigned int)op1
;
2404 unsigned int wop2
= (unsigned int)op2
;
2405 float tmp
= (*(float *)&wop1
- *(float *)&wop2
);
2406 result
= (uword64
)*(unsigned int *)&tmp
;
2411 double tmp
= (*(double *)&op1
- *(double *)&op2
);
2412 result
= *(uword64
*)&tmp
;
2416 fprintf (stderr
, "Bad switch\n");
2421 printf("DBG: Sub: returning 0x%s (format = %s)\n",pr_addr(result
),DOFMT(fmt
));
2428 Multiply(op1
,op2
,fmt
)
2436 printf("DBG: Multiply: %s: op1 = 0x%s : op2 = 0x%s\n",DOFMT(fmt
),pr_addr(op1
),pr_addr(op2
));
2439 /* The registers must specify FPRs valid for operands of type
2440 "fmt". If they are not valid, the result is undefined. */
2442 /* The format type should already have been checked: */
2446 unsigned int wop1
= (unsigned int)op1
;
2447 unsigned int wop2
= (unsigned int)op2
;
2448 float tmp
= (*(float *)&wop1
* *(float *)&wop2
);
2449 result
= (uword64
)*(unsigned int *)&tmp
;
2454 double tmp
= (*(double *)&op1
* *(double *)&op2
);
2455 result
= *(uword64
*)&tmp
;
2459 fprintf (stderr
, "Bad switch\n");
2464 printf("DBG: Multiply: returning 0x%s (format = %s)\n",pr_addr(result
),DOFMT(fmt
));
2479 printf("DBG: Divide: %s: op1 = 0x%s : op2 = 0x%s\n",DOFMT(fmt
),pr_addr(op1
),pr_addr(op2
));
2482 /* The registers must specify FPRs valid for operands of type
2483 "fmt". If they are not valid, the result is undefined. */
2485 /* The format type should already have been checked: */
2489 unsigned int wop1
= (unsigned int)op1
;
2490 unsigned int wop2
= (unsigned int)op2
;
2491 float tmp
= (*(float *)&wop1
/ *(float *)&wop2
);
2492 result
= (uword64
)*(unsigned int *)&tmp
;
2497 double tmp
= (*(double *)&op1
/ *(double *)&op2
);
2498 result
= *(uword64
*)&tmp
;
2502 fprintf (stderr
, "Bad switch\n");
2507 printf("DBG: Divide: returning 0x%s (format = %s)\n",pr_addr(result
),DOFMT(fmt
));
2521 printf("DBG: Recip: %s: op = 0x%s\n",DOFMT(fmt
),pr_addr(op
));
2524 /* The registers must specify FPRs valid for operands of type
2525 "fmt". If they are not valid, the result is undefined. */
2527 /* The format type should already have been checked: */
2531 unsigned int wop
= (unsigned int)op
;
2532 float tmp
= ((float)1.0 / *(float *)&wop
);
2533 result
= (uword64
)*(unsigned int *)&tmp
;
2538 double tmp
= ((double)1.0 / *(double *)&op
);
2539 result
= *(uword64
*)&tmp
;
2543 fprintf (stderr
, "Bad switch\n");
2548 printf("DBG: Recip: returning 0x%s (format = %s)\n",pr_addr(result
),DOFMT(fmt
));
2562 printf("DBG: SquareRoot: %s: op = 0x%s\n",DOFMT(fmt
),pr_addr(op
));
2565 /* The registers must specify FPRs valid for operands of type
2566 "fmt". If they are not valid, the result is undefined. */
2568 /* The format type should already have been checked: */
2572 unsigned int wop
= (unsigned int)op
;
2574 float tmp
= ((float)sqrt((double)*(float *)&wop
));
2575 result
= (uword64
)*(unsigned int *)&tmp
;
2577 /* TODO: Provide square-root */
2578 result
= (uword64
)0;
2585 double tmp
= (sqrt(*(double *)&op
));
2586 result
= *(uword64
*)&tmp
;
2588 /* TODO: Provide square-root */
2589 result
= (uword64
)0;
2594 fprintf (stderr
, "Bad switch\n");
2599 printf("DBG: SquareRoot: returning 0x%s (format = %s)\n",pr_addr(result
),DOFMT(fmt
));
2606 convert(sd
,cia
,rm
,op
,from
,to
)
2617 printf("DBG: Convert: mode %s : op 0x%s : from %s : to %s : (PC = 0x%s)\n",RMMODE(rm
),pr_addr(op
),DOFMT(from
),DOFMT(to
),pr_addr(IPC
));
2620 /* The value "op" is converted to the destination format, rounding
2621 using mode "rm". When the destination is a fixed-point format,
2622 then a source value of Infinity, NaN or one which would round to
2623 an integer outside the fixed point range then an IEEE Invalid
2624 Operation condition is raised. */
2631 tmp
= (float)(*(double *)&op
);
2635 tmp
= (float)((int)(op
& 0xFFFFFFFF));
2639 tmp
= (float)((word64
)op
);
2642 fprintf (stderr
, "Bad switch\n");
2647 /* FIXME: This code is incorrect. The rounding mode does not
2648 round to integral values; it rounds to the nearest
2649 representable value in the format. */
2653 /* Round result to nearest representable value. When two
2654 representable values are equally near, round to the value
2655 that has a least significant bit of zero (i.e. is even). */
2657 tmp
= (float)anint((double)tmp
);
2659 /* TODO: Provide round-to-nearest */
2664 /* Round result to the value closest to, and not greater in
2665 magnitude than, the result. */
2667 tmp
= (float)aint((double)tmp
);
2669 /* TODO: Provide round-to-zero */
2674 /* Round result to the value closest to, and not less than,
2676 tmp
= (float)ceil((double)tmp
);
2680 /* Round result to the value closest to, and not greater than,
2682 tmp
= (float)floor((double)tmp
);
2687 result
= (uword64
)*(unsigned int *)&tmp
;
2699 unsigned int wop
= (unsigned int)op
;
2700 tmp
= (double)(*(float *)&wop
);
2705 xxx
= SIGNEXTEND((op
& 0xFFFFFFFF),32);
2710 tmp
= (double)((word64
)op
);
2714 fprintf (stderr
, "Bad switch\n");
2719 /* FIXME: This code is incorrect. The rounding mode does not
2720 round to integral values; it rounds to the nearest
2721 representable value in the format. */
2726 tmp
= anint(*(double *)&tmp
);
2728 /* TODO: Provide round-to-nearest */
2734 tmp
= aint(*(double *)&tmp
);
2736 /* TODO: Provide round-to-zero */
2741 tmp
= ceil(*(double *)&tmp
);
2745 tmp
= floor(*(double *)&tmp
);
2750 result
= *(uword64
*)&tmp
;
2756 if (Infinity(op
,from
) || NaN(op
,from
) || (1 == 0/*TODO: check range */)) {
2757 printf("DBG: TODO: update FCSR\n");
2758 SignalExceptionFPE ();
2760 if (to
== fmt_word
) {
2765 unsigned int wop
= (unsigned int)op
;
2766 tmp
= (int)*((float *)&wop
);
2770 tmp
= (int)*((double *)&op
);
2772 printf("DBG: from double %.30f (0x%s) to word: 0x%08X\n",*((double *)&op
),pr_addr(op
),tmp
);
2776 fprintf (stderr
, "Bad switch\n");
2779 result
= (uword64
)tmp
;
2780 } else { /* fmt_long */
2785 unsigned int wop
= (unsigned int)op
;
2786 tmp
= (word64
)*((float *)&wop
);
2790 tmp
= (word64
)*((double *)&op
);
2793 fprintf (stderr
, "Bad switch\n");
2796 result
= (uword64
)tmp
;
2801 fprintf (stderr
, "Bad switch\n");
2806 printf("DBG: Convert: returning 0x%s (to format = %s)\n",pr_addr(result
),DOFMT(to
));
2813 /*-- co-processor support routines ------------------------------------------*/
2816 CoProcPresent(coproc_number
)
2817 unsigned int coproc_number
;
2819 /* Return TRUE if simulator provides a model for the given co-processor number */
2824 cop_lw(sd
,cia
,coproc_num
,coproc_reg
,memword
)
2827 int coproc_num
, coproc_reg
;
2828 unsigned int memword
;
2830 switch (coproc_num
) {
2834 printf("DBG: COP_LW: memword = 0x%08X (uword64)memword = 0x%s\n",memword
,pr_addr(memword
));
2836 StoreFPR(coproc_reg
,fmt_word
,(uword64
)memword
);
2837 FPR_STATE
[coproc_reg
] = fmt_uninterpreted
;
2842 #if 0 /* this should be controlled by a configuration option */
2843 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
));
2852 cop_ld(sd
,cia
,coproc_num
,coproc_reg
,memword
)
2855 int coproc_num
, coproc_reg
;
2858 switch (coproc_num
) {
2861 StoreFPR(coproc_reg
,fmt_uninterpreted
,memword
);
2866 #if 0 /* this message should be controlled by a configuration option */
2867 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
));
2876 cop_sw(sd
,cia
,coproc_num
,coproc_reg
)
2879 int coproc_num
, coproc_reg
;
2881 unsigned int value
= 0;
2883 switch (coproc_num
) {
2889 hold
= FPR_STATE
[coproc_reg
];
2890 FPR_STATE
[coproc_reg
] = fmt_word
;
2891 value
= (unsigned int)ValueFPR(coproc_reg
,fmt_uninterpreted
);
2892 FPR_STATE
[coproc_reg
] = hold
;
2896 value
= (unsigned int)ValueFPR(coproc_reg
,FPR_STATE
[coproc_reg
]);
2899 printf("DBG: COP_SW: reg in format %s (will be accessing as single)\n",DOFMT(FPR_STATE
[coproc_reg
]));
2901 value
= (unsigned int)ValueFPR(coproc_reg
,fmt_single
);
2908 #if 0 /* should be controlled by configuration option */
2909 sim_io_printf(sd
,"COP_SW(%d,%d) at PC = 0x%s : TODO (architecture specific)\n",coproc_num
,coproc_reg
,pr_addr(cia
));
2918 cop_sd(sd
,cia
,coproc_num
,coproc_reg
)
2921 int coproc_num
, coproc_reg
;
2924 switch (coproc_num
) {
2928 value
= ValueFPR(coproc_reg
,fmt_uninterpreted
);
2931 value
= ValueFPR(coproc_reg
,FPR_STATE
[coproc_reg
]);
2934 printf("DBG: COP_SD: reg in format %s (will be accessing as double)\n",DOFMT(FPR_STATE
[coproc_reg
]));
2936 value
= ValueFPR(coproc_reg
,fmt_double
);
2943 #if 0 /* should be controlled by configuration option */
2944 sim_io_printf(sd
,"COP_SD(%d,%d) at PC = 0x%s : TODO (architecture specific)\n",coproc_num
,coproc_reg
,pr_addr(cia
));
2953 decode_coproc(sd
,cia
,instruction
)
2956 unsigned int instruction
;
2958 int coprocnum
= ((instruction
>> 26) & 3);
2962 case 0: /* standard CPU control and cache registers */
2964 int code
= ((instruction
>> 21) & 0x1F);
2965 /* R4000 Users Manual (second edition) lists the following CP0
2967 DMFC0 Doubleword Move From CP0 (VR4100 = 01000000001tttttddddd00000000000)
2968 DMTC0 Doubleword Move To CP0 (VR4100 = 01000000101tttttddddd00000000000)
2969 MFC0 word Move From CP0 (VR4100 = 01000000000tttttddddd00000000000)
2970 MTC0 word Move To CP0 (VR4100 = 01000000100tttttddddd00000000000)
2971 TLBR Read Indexed TLB Entry (VR4100 = 01000010000000000000000000000001)
2972 TLBWI Write Indexed TLB Entry (VR4100 = 01000010000000000000000000000010)
2973 TLBWR Write Random TLB Entry (VR4100 = 01000010000000000000000000000110)
2974 TLBP Probe TLB for Matching Entry (VR4100 = 01000010000000000000000000001000)
2975 CACHE Cache operation (VR4100 = 101111bbbbbpppppiiiiiiiiiiiiiiii)
2976 ERET Exception return (VR4100 = 01000010000000000000000000011000)
2978 if (((code
== 0x00) || (code
== 0x04)) && ((instruction
& 0x7FF) == 0))
2980 int rt
= ((instruction
>> 16) & 0x1F);
2981 int rd
= ((instruction
>> 11) & 0x1F);
2983 switch (rd
) /* NOTEs: Standard CP0 registers */
2985 /* 0 = Index R4000 VR4100 VR4300 */
2986 /* 1 = Random R4000 VR4100 VR4300 */
2987 /* 2 = EntryLo0 R4000 VR4100 VR4300 */
2988 /* 3 = EntryLo1 R4000 VR4100 VR4300 */
2989 /* 4 = Context R4000 VR4100 VR4300 */
2990 /* 5 = PageMask R4000 VR4100 VR4300 */
2991 /* 6 = Wired R4000 VR4100 VR4300 */
2992 /* 8 = BadVAddr R4000 VR4100 VR4300 */
2993 /* 9 = Count R4000 VR4100 VR4300 */
2994 /* 10 = EntryHi R4000 VR4100 VR4300 */
2995 /* 11 = Compare R4000 VR4100 VR4300 */
2996 /* 12 = SR R4000 VR4100 VR4300 */
3003 /* 13 = Cause R4000 VR4100 VR4300 */
3010 /* 14 = EPC R4000 VR4100 VR4300 */
3011 /* 15 = PRId R4000 VR4100 VR4300 */
3012 #ifdef SUBTARGET_R3900
3021 /* 16 = Config R4000 VR4100 VR4300 */
3023 #ifdef SUBTARGET_R3900
3032 /* 17 = LLAddr R4000 VR4100 VR4300 */
3034 /* 18 = WatchLo R4000 VR4100 VR4300 */
3035 /* 19 = WatchHi R4000 VR4100 VR4300 */
3036 /* 20 = XContext R4000 VR4100 VR4300 */
3037 /* 26 = PErr or ECC R4000 VR4100 VR4300 */
3038 /* 27 = CacheErr R4000 VR4100 */
3039 /* 28 = TagLo R4000 VR4100 VR4300 */
3040 /* 29 = TagHi R4000 VR4100 VR4300 */
3041 /* 30 = ErrorEPC R4000 VR4100 VR4300 */
3042 GPR
[rt
] = 0xDEADC0DE; /* CPR[0,rd] */
3043 /* CPR[0,rd] = GPR[rt]; */
3046 sim_io_printf(sd
,"Warning: MFC0 %d,%d ignored (architecture specific)\n",rt
,rd
);
3048 sim_io_printf(sd
,"Warning: MTC0 %d,%d ignored (architecture specific)\n",rt
,rd
);
3051 else if (code
== 0x10 && (instruction
& 0x3f) == 0x18)
3054 if (SR
& status_ERL
)
3056 /* Oops, not yet available */
3057 sim_io_printf(sd
,"Warning: ERET when SR[ERL] set not handled yet");
3067 else if (code
== 0x10 && (instruction
& 0x3f) == 0x10)
3071 else if (code
== 0x10 && (instruction
& 0x3f) == 0x1F)
3079 sim_io_eprintf(sd
,"Unrecognised COP0 instruction 0x%08X at PC = 0x%s : No handler present\n",instruction
,pr_addr(cia
));
3080 /* TODO: When executing an ERET or RFE instruction we should
3081 clear LLBIT, to ensure that any out-standing atomic
3082 read/modify/write sequence fails. */
3086 case 2: /* undefined co-processor */
3087 sim_io_eprintf(sd
,"COP2 instruction 0x%08X at PC = 0x%s : No handler present\n",instruction
,pr_addr(cia
));
3090 case 1: /* should not occur (FPU co-processor) */
3091 case 3: /* should not occur (FPU co-processor) */
3092 SignalException(ReservedInstruction
,instruction
);
3099 /*-- instruction simulation -------------------------------------------------*/
3101 /* When the IGEN simulator is being built, the function below is be
3102 replaced by a generated version. However, WITH_IGEN == 2 indicates
3103 that the fubction below should be compiled but under a different
3104 name (to allow backward compatibility) */
3106 #if (WITH_IGEN != 1)
3108 void old_engine_run
PARAMS ((SIM_DESC sd
, int next_cpu_nr
, int siggnal
));
3110 old_engine_run (sd
, next_cpu_nr
, siggnal
)
3113 sim_engine_run (sd
, next_cpu_nr
, siggnal
)
3116 int next_cpu_nr
; /* ignore */
3117 int siggnal
; /* ignore */
3119 #if !defined(FASTSIM)
3120 unsigned int pipeline_count
= 1;
3124 if (STATE_MEMORY (sd
) == NULL
) {
3125 printf("DBG: simulate() entered with no memory\n");
3130 #if 0 /* Disabled to check that everything works OK */
3131 /* The VR4300 seems to sign-extend the PC on its first
3132 access. However, this may just be because it is currently
3133 configured in 32bit mode. However... */
3134 PC
= SIGNEXTEND(PC
,32);
3137 /* main controlling loop */
3139 /* vaddr is slowly being replaced with cia - current instruction
3141 address_word cia
= (uword64
)PC
;
3142 address_word vaddr
= cia
;
3145 unsigned int instruction
; /* uword64? what's this used for? FIXME! */
3149 printf("DBG: state = 0x%08X :",state
);
3150 if (state
& simHALTEX
) printf(" simHALTEX");
3151 if (state
& simHALTIN
) printf(" simHALTIN");
3156 DSSTATE
= (STATE
& simDELAYSLOT
);
3159 sim_io_printf(sd
,"DBG: DSPC = 0x%s\n",pr_addr(DSPC
));
3162 /* Fetch the next instruction from the simulator memory: */
3163 if (AddressTranslation(cia
,isINSTRUCTION
,isLOAD
,&paddr
,&cca
,isTARGET
,isREAL
)) {
3164 if ((vaddr
& 1) == 0) {
3165 /* Copy the action of the LW instruction */
3166 unsigned int reverse
= (ReverseEndian
? (LOADDRMASK
>> 2) : 0);
3167 unsigned int bigend
= (BigEndianCPU
? (LOADDRMASK
>> 2) : 0);
3170 paddr
= ((paddr
& ~LOADDRMASK
) | ((paddr
& LOADDRMASK
) ^ (reverse
<< 2)));
3171 LoadMemory(&value
,NULL
,cca
,AccessLength_WORD
,paddr
,vaddr
,isINSTRUCTION
,isREAL
);
3172 byte
= ((vaddr
& LOADDRMASK
) ^ (bigend
<< 2));
3173 instruction
= ((value
>> (8 * byte
)) & 0xFFFFFFFF);
3175 /* Copy the action of the LH instruction */
3176 unsigned int reverse
= (ReverseEndian
? (LOADDRMASK
>> 1) : 0);
3177 unsigned int bigend
= (BigEndianCPU
? (LOADDRMASK
>> 1) : 0);
3180 paddr
= (((paddr
& ~ (uword64
) 1) & ~LOADDRMASK
)
3181 | (((paddr
& ~ (uword64
) 1) & LOADDRMASK
) ^ (reverse
<< 1)));
3182 LoadMemory(&value
,NULL
,cca
, AccessLength_HALFWORD
,
3183 paddr
& ~ (uword64
) 1,
3184 vaddr
, isINSTRUCTION
, isREAL
);
3185 byte
= (((vaddr
&~ (uword64
) 1) & LOADDRMASK
) ^ (bigend
<< 1));
3186 instruction
= ((value
>> (8 * byte
)) & 0xFFFF);
3189 fprintf(stderr
,"Cannot translate address for PC = 0x%s failed\n",pr_addr(PC
));
3194 sim_io_printf(sd
,"DBG: fetched 0x%08X from PC = 0x%s\n",instruction
,pr_addr(PC
));
3197 /* This is required by exception processing, to ensure that we can
3198 cope with exceptions in the delay slots of branches that may
3199 already have changed the PC. */
3200 if ((vaddr
& 1) == 0)
3201 PC
+= 4; /* increment ready for the next fetch */
3204 /* NOTE: If we perform a delay slot change to the PC, this
3205 increment is not requuired. However, it would make the
3206 simulator more complicated to try and avoid this small hit. */
3208 /* Currently this code provides a simple model. For more
3209 complicated models we could perform exception status checks at
3210 this point, and set the simSTOP state as required. This could
3211 also include processing any hardware interrupts raised by any
3212 I/O model attached to the simulator context.
3214 Support for "asynchronous" I/O events within the simulated world
3215 could be providing by managing a counter, and calling a I/O
3216 specific handler when a particular threshold is reached. On most
3217 architectures a decrement and check for zero operation is
3218 usually quicker than an increment and compare. However, the
3219 process of managing a known value decrement to zero, is higher
3220 than the cost of using an explicit value UINT_MAX into the
3221 future. Which system is used will depend on how complicated the
3222 I/O model is, and how much it is likely to affect the simulator
3225 If events need to be scheduled further in the future than
3226 UINT_MAX event ticks, then the I/O model should just provide its
3227 own counter, triggered from the event system. */
3229 /* MIPS pipeline ticks. To allow for future support where the
3230 pipeline hit of individual instructions is known, this control
3231 loop manages a "pipeline_count" variable. It is initialised to
3232 1 (one), and will only be changed by the simulator engine when
3233 executing an instruction. If the engine does not have access to
3234 pipeline cycle count information then all instructions will be
3235 treated as using a single cycle. NOTE: A standard system is not
3236 provided by the default simulator because different MIPS
3237 architectures have different cycle counts for the same
3240 [NOTE: pipeline_count has been replaced the event queue] */
3243 /* Set previous flag, depending on current: */
3244 if (STATE
& simPCOC0
)
3248 /* and update the current value: */
3255 /* NOTE: For multi-context simulation environments the "instruction"
3256 variable should be local to this routine. */
3258 /* Shorthand accesses for engine. Note: If we wanted to use global
3259 variables (and a single-threaded simulator engine), then we can
3260 create the actual variables with these names. */
3262 if (!(STATE
& simSKIPNEXT
)) {
3263 /* Include the simulator engine */
3264 #include "oengine.c"
3265 #if ((GPRLEN == 64) && !PROCESSOR_64BIT) || ((GPRLEN == 32) && PROCESSOR_64BIT)
3266 #error "Mismatch between run-time simulator code and simulation engine"
3268 #if (WITH_TARGET_WORD_BITSIZE != GPRLEN)
3269 #error "Mismatch between configure WITH_TARGET_WORD_BITSIZE and gencode GPRLEN"
3271 #if (WITH_FLOATING_POINT == HARD_FLOATING_POINT != defined (HASFPU))
3272 #error "Mismatch between configure WITH_FLOATING_POINT and gencode HASFPU"
3275 #if defined(WARN_LOHI)
3276 /* Decrement the HI/LO validity ticks */
3281 /* start-sanitize-r5900 */
3286 /* end-sanitize-r5900 */
3287 #endif /* WARN_LOHI */
3289 /* For certain MIPS architectures, GPR[0] is hardwired to zero. We
3290 should check for it being changed. It is better doing it here,
3291 than within the simulator, since it will help keep the simulator
3294 #if defined(WARN_ZERO)
3295 sim_io_eprintf(sd
,"The ZERO register has been updated with 0x%s (PC = 0x%s) (reset back to zero)\n",pr_addr(ZERO
),pr_addr(cia
));
3296 #endif /* WARN_ZERO */
3297 ZERO
= 0; /* reset back to zero before next instruction */
3299 } else /* simSKIPNEXT check */
3300 STATE
&= ~simSKIPNEXT
;
3302 /* If the delay slot was active before the instruction is
3303 executed, then update the PC to its new value: */
3306 printf("DBG: dsstate set before instruction execution - updating PC to 0x%s\n",pr_addr(DSPC
));
3312 if (MIPSISA
< 4) { /* The following is only required on pre MIPS IV processors: */
3313 /* Deal with pending register updates: */
3315 printf("DBG: EMPTY BEFORE pending_in = %d, pending_out = %d, pending_total = %d\n",pending_in
,pending_out
,pending_total
);
3317 if (PENDING_OUT
!= PENDING_IN
) {
3319 int index
= PENDING_OUT
;
3320 int total
= PENDING_TOTAL
;
3321 if (PENDING_TOTAL
== 0) {
3322 fprintf(stderr
,"FATAL: Mis-match on pending update pointers\n");
3325 for (loop
= 0; (loop
< total
); loop
++) {
3327 printf("DBG: BEFORE index = %d, loop = %d\n",index
,loop
);
3329 if (PENDING_SLOT_REG
[index
] != (LAST_EMBED_REGNUM
+ 1)) {
3331 printf("pending_slot_count[%d] = %d\n",index
,PENDING_SLOT_COUNT
[index
]);
3333 if (--(PENDING_SLOT_COUNT
[index
]) == 0) {
3335 printf("pending_slot_reg[%d] = %d\n",index
,PENDING_SLOT_REG
[index
]);
3336 printf("pending_slot_value[%d] = 0x%s\n",index
,pr_addr(PENDING_SLOT_VALUE
[index
]));
3338 if (PENDING_SLOT_REG
[index
] == COCIDX
) {
3340 SETFCC(0,((FCR31
& (1 << 23)) ? 1 : 0));
3345 REGISTERS
[PENDING_SLOT_REG
[index
]] = PENDING_SLOT_VALUE
[index
];
3347 /* The only time we have PENDING updates to FPU
3348 registers, is when performing binary transfers. This
3349 means we should update the register type field. */
3350 if ((PENDING_SLOT_REG
[index
] >= FGRIDX
) && (PENDING_SLOT_REG
[index
] < (FGRIDX
+ 32)))
3351 FPR_STATE
[PENDING_SLOT_REG
[index
] - FGRIDX
] = fmt_uninterpreted
;
3355 printf("registers[%d] = 0x%s\n",PENDING_SLOT_REG
[index
],pr_addr(REGISTERS
[PENDING_SLOT_REG
[index
]]));
3357 PENDING_SLOT_REG
[index
] = (LAST_EMBED_REGNUM
+ 1);
3359 if (PENDING_OUT
== PSLOTS
)
3365 printf("DBG: AFTER index = %d, loop = %d\n",index
,loop
);
3368 if (index
== PSLOTS
)
3373 printf("DBG: EMPTY AFTER pending_in = %d, pending_out = %d, pending_total = %d\n",PENDING_IN
,PENDING_OUT
,PENDING_TOTAL
);
3377 #if !defined(FASTSIM)
3378 if (sim_events_tickn (sd
, pipeline_count
))
3380 /* cpu->cia = cia; */
3381 sim_events_process (sd
);
3384 if (sim_events_tick (sd
))
3386 /* cpu->cia = cia; */
3387 sim_events_process (sd
);
3389 #endif /* FASTSIM */
3395 /* This code copied from gdb's utils.c. Would like to share this code,
3396 but don't know of a common place where both could get to it. */
3398 /* Temporary storage using circular buffer */
3404 static char buf
[NUMCELLS
][CELLSIZE
];
3406 if (++cell
>=NUMCELLS
) cell
=0;
3410 /* Print routines to handle variable size regs, etc */
3412 /* Eliminate warning from compiler on 32-bit systems */
3413 static int thirty_two
= 32;
3419 char *paddr_str
=get_cell();
3420 switch (sizeof(addr
))
3423 sprintf(paddr_str
,"%08lx%08lx",
3424 (unsigned long)(addr
>>thirty_two
),(unsigned long)(addr
&0xffffffff));
3427 sprintf(paddr_str
,"%08lx",(unsigned long)addr
);
3430 sprintf(paddr_str
,"%04x",(unsigned short)(addr
&0xffff));
3433 sprintf(paddr_str
,"%x",addr
);
3442 char *paddr_str
=get_cell();
3443 sprintf(paddr_str
,"%08lx%08lx",
3444 (unsigned long)(addr
>>thirty_two
),(unsigned long)(addr
&0xffffffff));
3449 /*---------------------------------------------------------------------------*/
3450 /*> EOF interp.c <*/