1 /* ARC target-dependent stuff.
2 Copyright (C) 1995, 1997 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
25 #include "floatformat.h"
29 /* Current CPU, set with the "set cpu" command. */
30 static int arc_bfd_mach_type;
32 char *tmp_arc_cpu_type;
34 /* Table of cpu names. */
38 } arc_cpu_type_table[] = {
39 { "base", bfd_mach_arc_base },
43 /* Used by simulator. */
44 int display_pipeline_p;
46 /* This one must have the same type as used in the emulator.
47 It's currently an enum so this should be ok for now. */
50 #define ARC_CALL_SAVED_REG(r) ((r) >= 16 && (r) < 24)
52 #define OPMASK 0xf8000000
54 /* Instruction field accessor macros.
55 See the Programmer's Reference Manual. */
56 #define X_OP(i) (((i) >> 27) & 0x1f)
57 #define X_A(i) (((i) >> 21) & 0x3f)
58 #define X_B(i) (((i) >> 15) & 0x3f)
59 #define X_C(i) (((i) >> 9) & 0x3f)
60 #define X_D(i) ((((i) & 0x1ff) ^ 0x100) - 0x100)
61 #define X_L(i) (((((i) >> 5) & 0x3ffffc) ^ 0x200000) - 0x200000)
62 #define X_N(i) (((i) >> 5) & 3)
63 #define X_Q(i) ((i) & 0x1f)
65 /* Return non-zero if X is a short immediate data indicator. */
66 #define SHIMM_P(x) ((x) == 61 || (x) == 63)
68 /* Return non-zero if X is a "long" (32 bit) immediate data indicator. */
69 #define LIMM_P(x) ((x) == 62)
71 /* Build a simple instruction. */
72 #define BUILD_INSN(op, a, b, c, d) \
73 ((((op) & 31) << 27) \
74 | (((a) & 63) << 21) \
75 | (((b) & 63) << 15) \
79 /* Codestream stuff. */
80 static void codestream_read PARAMS ((unsigned int *, int));
81 static void codestream_seek PARAMS ((CORE_ADDR));
82 static unsigned int codestream_fill PARAMS ((int));
84 #define CODESTREAM_BUFSIZ 16
85 static CORE_ADDR codestream_next_addr;
86 static CORE_ADDR codestream_addr;
87 static unsigned int codestream_buf[CODESTREAM_BUFSIZ];
88 static int codestream_off;
89 static int codestream_cnt;
91 #define codestream_tell() \
92 (codestream_addr + codestream_off * sizeof (codestream_buf[0]))
93 #define codestream_peek() \
94 (codestream_cnt == 0 \
95 ? codestream_fill (1) \
96 : codestream_buf[codestream_off])
97 #define codestream_get() \
98 (codestream_cnt-- == 0 \
99 ? codestream_fill (0) \
100 : codestream_buf[codestream_off++])
103 codestream_fill (peek_flag)
106 codestream_addr = codestream_next_addr;
107 codestream_next_addr += CODESTREAM_BUFSIZ * sizeof (codestream_buf[0]);
109 codestream_cnt = CODESTREAM_BUFSIZ;
110 read_memory (codestream_addr, (char *) codestream_buf,
111 CODESTREAM_BUFSIZ * sizeof (codestream_buf[0]));
112 /* FIXME: check return code? */
114 /* Handle byte order differences. */
115 if (HOST_BYTE_ORDER != TARGET_BYTE_ORDER)
117 register unsigned int i, j, n = sizeof (codestream_buf[0]);
118 register char tmp, *p;
119 for (i = 0, p = (char *) codestream_buf; i < CODESTREAM_BUFSIZ;
121 for (j = 0; j < n / 2; ++j)
122 tmp = p[j], p[j] = p[n - 1 - j], p[n - 1 - j] = tmp;
126 return codestream_peek ();
128 return codestream_get ();
132 codestream_seek (place)
135 codestream_next_addr = place / CODESTREAM_BUFSIZ;
136 codestream_next_addr *= CODESTREAM_BUFSIZ;
139 while (codestream_tell () != place)
143 /* This function is currently unused but leave in for now. */
146 codestream_read (buf, count)
153 for (i = 0; i < count; i++)
154 *p++ = codestream_get ();
157 /* Set up prologue scanning and return the first insn. */
160 setup_prologue_scan (pc)
165 codestream_seek (pc);
166 insn = codestream_get ();
172 * Find & return amount a local space allocated, and advance codestream to
173 * first register push (if any).
174 * If entry sequence doesn't make sense, return -1, and leave
175 * codestream pointer random.
179 arc_get_frame_setup (pc)
183 /* Size of frame or -1 if unrecognizable prologue. */
185 /* An initial "sub sp,sp,N" may or may not be for a stdarg fn. */
186 int maybe_stdarg_decr = -1;
188 insn = setup_prologue_scan (pc);
190 /* The authority for what appears here is the home-grown ABI.
191 The most recent version is 1.2. */
193 /* First insn may be "sub sp,sp,N" if stdarg fn. */
194 if ((insn & BUILD_INSN (-1, -1, -1, -1, 0))
195 == BUILD_INSN (10, SP_REGNUM, SP_REGNUM, SHIMM_REGNUM, 0))
197 maybe_stdarg_decr = X_D (insn);
198 insn = codestream_get ();
201 if ((insn & BUILD_INSN (-1, 0, -1, -1, -1)) /* st blink,[sp,4] */
202 == BUILD_INSN (2, 0, SP_REGNUM, BLINK_REGNUM, 4))
204 insn = codestream_get ();
205 /* Frame may not be necessary, even though blink is saved.
206 At least this is something we recognize. */
210 if ((insn & BUILD_INSN (-1, 0, -1, -1, -1)) /* st fp,[sp] */
211 == BUILD_INSN (2, 0, SP_REGNUM, FP_REGNUM, 0))
213 insn = codestream_get ();
214 if ((insn & BUILD_INSN (-1, -1, -1, -1, 0))
215 != BUILD_INSN (12, FP_REGNUM, SP_REGNUM, SP_REGNUM, 0))
218 /* Check for stack adjustment sub sp,sp,N. */
219 insn = codestream_peek ();
220 if ((insn & BUILD_INSN (-1, -1, -1, 0, 0))
221 == BUILD_INSN (10, SP_REGNUM, SP_REGNUM, 0, 0))
223 if (LIMM_P (X_C (insn)))
224 frame_size = codestream_get ();
225 else if (SHIMM_P (X_C (insn)))
226 frame_size = X_D (insn);
234 /* This sequence is used to get the address of the return
235 buffer for a function that returns a structure. */
236 insn = codestream_peek ();
237 if (insn & OPMASK == 0x60000000)
247 /* If we found a "sub sp,sp,N" and nothing else, it may or may not be a
248 stdarg fn. The stdarg decrement is not treated as part of the frame size,
249 so we have a dilemma: what do we return? For now, if we get a
250 "sub sp,sp,N" and nothing else assume this isn't a stdarg fn. One way
251 to fix this completely would be to add a bit to the function descriptor
252 that says the function is a stdarg function. */
254 if (frame_size < 0 && maybe_stdarg_decr > 0)
255 return maybe_stdarg_decr;
259 /* Given a pc value, skip it forward past the function prologue by
260 disassembling instructions that appear to be a prologue.
262 If FRAMELESS_P is set, we are only testing to see if the function
263 is frameless. If it is a frameless function, return PC unchanged.
264 This allows a quicker answer. */
267 skip_prologue (pc, frameless_p)
274 if ((frame_size = arc_get_frame_setup (pc)) < 0)
278 return frame_size == 0 ? pc : codestream_tell ();
280 /* Skip over register saves. */
281 for (i = 0; i < 8; i++)
283 insn = codestream_peek ();
284 if ((insn & BUILD_INSN (-1, 0, -1, 0, 0))
285 != BUILD_INSN (2, 0, SP_REGNUM, 0, 0))
286 break; /* not st insn */
287 if (! ARC_CALL_SAVED_REG (X_C (insn)))
292 return codestream_tell ();
295 /* Return the return address for a frame.
296 This is used to implement FRAME_SAVED_PC.
297 This is taken from frameless_look_for_prologue. */
300 arc_frame_saved_pc (frame)
301 struct frame_info *frame;
303 CORE_ADDR func_start;
306 func_start = get_pc_function_start (frame->pc) + FUNCTION_START_OFFSET;
310 return ARC_PC_TO_REAL_ADDRESS (read_memory_integer (FRAME_FP (frame) + 4, 4));
313 /* The authority for what appears here is the home-grown ABI.
314 The most recent version is 1.2. */
316 insn = setup_prologue_scan (func_start);
318 /* First insn may be "sub sp,sp,N" if stdarg fn. */
319 if ((insn & BUILD_INSN (-1, -1, -1, -1, 0))
320 == BUILD_INSN (10, SP_REGNUM, SP_REGNUM, SHIMM_REGNUM, 0))
321 insn = codestream_get ();
323 /* If the next insn is "st blink,[sp,4]" we can get blink from there.
324 Otherwise this is a leaf function and we can use blink. Note that
325 this still allows for the case where a leaf function saves/clobbers/
328 if ((insn & BUILD_INSN (-1, 0, -1, -1, -1)) /* st blink,[sp,4] */
329 != BUILD_INSN (2, 0, SP_REGNUM, BLINK_REGNUM, 4))
330 return ARC_PC_TO_REAL_ADDRESS (read_register (BLINK_REGNUM));
332 return ARC_PC_TO_REAL_ADDRESS (read_memory_integer (FRAME_FP (frame) + 4, 4));
336 * Parse the first few instructions of the function to see
337 * what registers were stored.
339 * The startup sequence can be at the start of the function.
340 * 'st blink,[sp+4], st fp,[sp], mov fp,sp'
342 * Local space is allocated just below by sub sp,sp,nnn.
343 * Next, the registers used by this function are stored (as offsets from sp).
347 frame_find_saved_regs (fip, fsrp)
348 struct frame_info *fip;
349 struct frame_saved_regs *fsrp;
353 CORE_ADDR dummy_bottom;
355 int i, regnum, offset;
357 memset (fsrp, 0, sizeof *fsrp);
359 /* If frame is the end of a dummy, compute where the beginning would be. */
360 dummy_bottom = fip->frame - 4 - REGISTER_BYTES - CALL_DUMMY_LENGTH;
362 /* Check if the PC is in the stack, in a dummy frame. */
363 if (dummy_bottom <= fip->pc && fip->pc <= fip->frame)
365 /* all regs were saved by push_call_dummy () */
367 for (i = 0; i < NUM_REGS; i++)
369 adr -= REGISTER_RAW_SIZE (i);
375 locals = arc_get_frame_setup (get_pc_function_start (fip->pc));
379 /* Set `adr' to the value of `sp'. */
380 adr = fip->frame - locals;
381 for (i = 0; i < 8; i++)
383 insn = codestream_get ();
384 if ((insn & BUILD_INSN (-1, 0, -1, 0, 0))
385 != BUILD_INSN (2, 0, SP_REGNUM, 0, 0))
389 fsrp->regs[regnum] = adr + offset;
393 fsrp->regs[PC_REGNUM] = fip->frame + 4;
394 fsrp->regs[FP_REGNUM] = fip->frame;
400 CORE_ADDR sp = read_register (SP_REGNUM);
402 char regbuf[MAX_REGISTER_RAW_SIZE];
404 read_register_gen (PC_REGNUM, regbuf);
405 write_memory (sp+4, regbuf, REGISTER_SIZE);
406 read_register_gen (FP_REGNUM, regbuf);
407 write_memory (sp, regbuf, REGISTER_SIZE);
408 write_register (FP_REGNUM, sp);
409 for (regnum = 0; regnum < NUM_REGS; regnum++)
411 read_register_gen (regnum, regbuf);
412 sp = push_bytes (sp, regbuf, REGISTER_RAW_SIZE (regnum));
414 sp += (2*REGISTER_SIZE);
415 write_register (SP_REGNUM, sp);
421 struct frame_info *frame = get_current_frame ();
424 struct frame_saved_regs fsr;
425 char regbuf[MAX_REGISTER_RAW_SIZE];
427 fp = FRAME_FP (frame);
428 get_frame_saved_regs (frame, &fsr);
429 for (regnum = 0; regnum < NUM_REGS; regnum++)
432 adr = fsr.regs[regnum];
435 read_memory (adr, regbuf, REGISTER_RAW_SIZE (regnum));
436 write_register_bytes (REGISTER_BYTE (regnum), regbuf,
437 REGISTER_RAW_SIZE (regnum));
440 write_register (FP_REGNUM, read_memory_integer (fp, 4));
441 write_register (PC_REGNUM, read_memory_integer (fp + 4, 4));
442 write_register (SP_REGNUM, fp + 8);
443 flush_cached_frames ();
446 /* Simulate single-step. */
450 NORMAL4, /* a normal 4 byte insn */
451 NORMAL8, /* a normal 8 byte insn */
452 BRANCH4, /* a 4 byte branch insn, including ones without delay slots */
453 BRANCH8, /* an 8 byte branch insn, including ones with delay slots */
456 /* Return the type of INSN and store in TARGET the destination address of a
457 branch if this is one. */
458 /* ??? Need to verify all cases are properly handled. */
461 get_insn_type (insn, pc, target)
463 CORE_ADDR pc, *target;
469 case 0 : case 1 : case 2 : /* load/store insns */
470 if (LIMM_P (X_A (insn))
471 || LIMM_P (X_B (insn))
472 || LIMM_P (X_C (insn)))
475 case 4 : case 5 : case 6 : /* branch insns */
476 *target = pc + 4 + X_L (insn);
477 /* ??? It isn't clear that this is always the right answer.
478 The problem occurs when the next insn is an 8 byte insn. If the
479 branch is conditional there's no worry as there shouldn't be an 8
480 byte insn following. The programmer may be cheating if s/he knows
481 the branch will never be taken, but we don't deal with that.
482 Note that the programmer is also allowed to play games by putting
483 an insn with long immediate data in the delay slot and then duplicate
484 the long immediate data at the branch target. Ugh! */
488 case 7 : /* jump insns */
489 if (LIMM_P (X_B (insn)))
491 limm = read_memory_integer (pc + 4, 4);
492 *target = ARC_PC_TO_REAL_ADDRESS (limm);
495 if (SHIMM_P (X_B (insn)))
496 *target = ARC_PC_TO_REAL_ADDRESS (X_D (insn));
498 *target = ARC_PC_TO_REAL_ADDRESS (read_register (X_B (insn)));
499 if (X_Q (insn) == 0 && X_N (insn) == 0)
502 default : /* arithmetic insns, etc. */
503 if (LIMM_P (X_A (insn))
504 || LIMM_P (X_B (insn))
505 || LIMM_P (X_C (insn)))
511 /* Non-zero if we just simulated a single-step. This is needed because we
512 cannot remove the breakpoints in the inferior process until after the
513 `wait' in `wait_for_inferior'. */
517 /* single_step() is called just before we want to resume the inferior, if we
518 want to single-step it but there is no hardware or kernel single-step
519 support. We find all the possible targets of the coming instruction and
522 single_step is also called just after the inferior stops. If we had
523 set up a simulated single-step, we undo our damage. */
527 enum target_signal ignore; /* sig, but we don't need it */
529 static CORE_ADDR next_pc, target;
531 typedef char binsn_quantum[BREAKPOINT_MAX];
532 static binsn_quantum break_mem[2];
540 pc = read_register (PC_REGNUM);
541 insn = read_memory_integer (pc, 4);
542 type = get_insn_type (insn, pc, &target);
544 /* Always set a breakpoint for the insn after the branch. */
545 next_pc = pc + ((type == NORMAL8 || type == BRANCH8) ? 8 : 4);
546 target_insert_breakpoint (next_pc, break_mem[0]);
550 if ((type == BRANCH4 || type == BRANCH8)
551 /* Watch out for branches to the following location.
552 We just stored a breakpoint there and another call to
553 target_insert_breakpoint will think the real insn is the
554 breakpoint we just stored there. */
555 && target != next_pc)
558 target_insert_breakpoint (target, break_mem[1]);
561 /* We are ready to let it go. */
566 /* Remove breakpoints. */
567 target_remove_breakpoint (next_pc, break_mem[0]);
570 target_remove_breakpoint (target, break_mem[1]);
573 stop_pc -= DECR_PC_AFTER_BREAK;
580 #ifdef GET_LONGJMP_TARGET
581 /* Figure out where the longjmp will land. Slurp the args out of the stack.
582 We expect the first arg to be a pointer to the jmp_buf structure from which
583 we extract the pc (JB_PC) that we will land at. The pc is copied into PC.
584 This routine returns true on success. */
587 get_longjmp_target(pc)
590 char buf[TARGET_PTR_BIT / TARGET_CHAR_BIT];
591 CORE_ADDR sp, jb_addr;
593 sp = read_register (SP_REGNUM);
595 if (target_read_memory (sp + SP_ARG0, /* Offset of first arg on stack */
597 TARGET_PTR_BIT / TARGET_CHAR_BIT))
600 jb_addr = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
602 if (target_read_memory (jb_addr + JB_PC * JB_ELEMENT_SIZE, buf,
603 TARGET_PTR_BIT / TARGET_CHAR_BIT))
606 *pc = extract_address (buf, TARGET_PTR_BIT / TARGET_CHAR_BIT);
610 #endif /* GET_LONGJMP_TARGET */
612 /* Disassemble one instruction. */
615 arc_print_insn (vma, info)
617 disassemble_info *info;
619 static int current_mach;
620 static int current_endian;
621 static disassembler_ftype current_disasm;
623 if (current_disasm == NULL
624 || arc_bfd_mach_type != current_mach
625 || TARGET_BYTE_ORDER != current_endian)
627 current_mach = arc_bfd_mach_type;
628 current_endian = TARGET_BYTE_ORDER;
629 current_disasm = arc_get_disassembler (current_mach,
630 current_endian == BIG_ENDIAN);
633 return (*current_disasm) (vma, info);
636 /* Command to set cpu type. */
639 arc_set_cpu_type_command (args, from_tty)
645 if (tmp_arc_cpu_type == NULL || *tmp_arc_cpu_type == '\0')
647 printf_unfiltered ("The known ARC cpu types are as follows:\n");
648 for (i = 0; arc_cpu_type_table[i].name != NULL; ++i)
649 printf_unfiltered ("%s\n", arc_cpu_type_table[i].name);
651 /* Restore the value. */
652 tmp_arc_cpu_type = strsave (arc_cpu_type);
657 if (!arc_set_cpu_type (tmp_arc_cpu_type))
659 error ("Unknown cpu type `%s'.", tmp_arc_cpu_type);
660 /* Restore its value. */
661 tmp_arc_cpu_type = strsave (arc_cpu_type);
666 arc_show_cpu_type_command (args, from_tty)
672 /* Modify the actual cpu type.
673 Result is a boolean indicating success. */
676 arc_set_cpu_type (str)
684 for (i = 0; arc_cpu_type_table[i].name != NULL; ++i)
686 if (strcasecmp (str, arc_cpu_type_table[i].name) == 0)
689 arc_bfd_mach_type = arc_cpu_type_table[i].value;
698 _initialize_arc_tdep ()
700 struct cmd_list_element *c;
702 c = add_set_cmd ("cpu", class_support, var_string_noescape,
703 (char *) &tmp_arc_cpu_type,
704 "Set the type of ARC cpu in use.\n\
705 This command has two purposes. In a multi-cpu system it lets one\n\
706 change the cpu being debugged. It also gives one access to\n\
707 cpu-type-specific registers and recognize cpu-type-specific instructions.\
710 c->function.cfunc = arc_set_cpu_type_command;
711 c = add_show_from_set (c, &showlist);
712 c->function.cfunc = arc_show_cpu_type_command;
714 /* We have to use strsave here because the `set' command frees it before
715 setting a new value. */
716 tmp_arc_cpu_type = strsave (DEFAULT_ARC_CPU_TYPE);
717 arc_set_cpu_type (tmp_arc_cpu_type);
719 c = add_set_cmd ("displaypipeline", class_support, var_zinteger,
720 (char *) &display_pipeline_p,
721 "Set pipeline display (simulator only).\n\
722 When enabled, the state of the pipeline after each cycle is displayed.",
724 c = add_show_from_set (c, &showlist);
726 c = add_set_cmd ("debugpipeline", class_support, var_zinteger,
727 (char *) &debug_pipeline_p,
728 "Set pipeline debug display (simulator only).\n\
729 When enabled, debugging information about the pipeline is displayed.",
731 c = add_show_from_set (c, &showlist);
733 c = add_set_cmd ("cputimer", class_support, var_zinteger,
735 "Set maximum cycle count (simulator only).\n\
736 Control will return to gdb if the timer expires.\n\
737 A negative value disables the timer.",
739 c = add_show_from_set (c, &showlist);
741 tm_print_insn = arc_print_insn;