1 /* Machine-dependent code which would otherwise be in inflow.c and core.c,
2 for GDB, the GNU debugger. This code is for the HP PA-RISC cpu.
3 Copyright 1986, 1987, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
5 Contributed by the Center for Software Science at the
8 This file is part of GDB.
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
29 /* For argument passing to the inferior */
33 #include <sys/types.h>
36 #include <sys/param.h>
39 #include <sys/ioctl.h>
41 #ifdef COFF_ENCAPSULATE
42 #include "a.out.encap.h"
47 #define N_SET_MAGIC(exec, val) ((exec).a_magic = (val))
50 /*#include <sys/user.h> After a.out.h */
53 #include <machine/psl.h>
63 /* Routines to extract various sized constants out of hppa
66 /* This assumes that no garbage lies outside of the lower bits of
70 sign_extend (val, bits)
73 return (int)(val >> bits - 1 ? (-1 << bits) | val : val);
76 /* For many immediate values the sign bit is the low bit! */
79 low_sign_extend (val, bits)
82 return (int)((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1);
84 /* extract the immediate field from a ld{bhw}s instruction */
87 get_field (val, from, to)
88 unsigned val, from, to;
91 return val & ((1 << 32 - from) - 1);
95 set_field (val, from, to, new_val)
96 unsigned *val, from, to;
98 unsigned mask = ~((1 << (to - from + 1)) << (31 - from));
99 return *val = *val & mask | (new_val << (31 - from));
102 /* extract a 3-bit space register number from a be, ble, mtsp or mfsp */
107 return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17);
110 extract_5_load (word)
113 return low_sign_extend (word >> 16 & MASK_5, 5);
116 /* extract the immediate field from a st{bhw}s instruction */
119 extract_5_store (word)
122 return low_sign_extend (word & MASK_5, 5);
125 /* extract an 11 bit immediate field */
131 return low_sign_extend (word & MASK_11, 11);
134 /* extract a 14 bit immediate field */
140 return low_sign_extend (word & MASK_14, 14);
143 /* deposit a 14 bit constant in a word */
146 deposit_14 (opnd, word)
150 unsigned sign = (opnd < 0 ? 1 : 0);
152 return word | ((unsigned)opnd << 1 & MASK_14) | sign;
155 /* extract a 21 bit constant */
165 val = GET_FIELD (word, 20, 20);
167 val |= GET_FIELD (word, 9, 19);
169 val |= GET_FIELD (word, 5, 6);
171 val |= GET_FIELD (word, 0, 4);
173 val |= GET_FIELD (word, 7, 8);
174 return sign_extend (val, 21) << 11;
177 /* deposit a 21 bit constant in a word. Although 21 bit constants are
178 usually the top 21 bits of a 32 bit constant, we assume that only
179 the low 21 bits of opnd are relevant */
182 deposit_21 (opnd, word)
187 val |= GET_FIELD (opnd, 11 + 14, 11 + 18);
189 val |= GET_FIELD (opnd, 11 + 12, 11 + 13);
191 val |= GET_FIELD (opnd, 11 + 19, 11 + 20);
193 val |= GET_FIELD (opnd, 11 + 1, 11 + 11);
195 val |= GET_FIELD (opnd, 11 + 0, 11 + 0);
199 /* extract a 12 bit constant from branch instructions */
205 return sign_extend (GET_FIELD (word, 19, 28) |
206 GET_FIELD (word, 29, 29) << 10 |
207 (word & 0x1) << 11, 12) << 2;
210 /* extract a 17 bit constant from branch instructions, returning the
211 19 bit signed value. */
217 return sign_extend (GET_FIELD (word, 19, 28) |
218 GET_FIELD (word, 29, 29) << 10 |
219 GET_FIELD (word, 11, 15) << 11 |
220 (word & 0x1) << 16, 17) << 2;
223 static int use_unwind = 0;
225 /* Lookup the unwind (stack backtrace) info for the given PC. We search all
226 of the objfiles seeking the unwind table entry for this PC. Each objfile
227 contains a sorted list of struct unwind_table_entry. Since we do a binary
228 search of the unwind tables, we depend upon them to be sorted. */
230 static struct unwind_table_entry *
231 find_unwind_entry(pc)
234 int first, middle, last;
235 struct objfile *objfile;
237 ALL_OBJFILES (objfile)
239 struct obj_unwind_info *ui;
241 ui = OBJ_UNWIND_INFO (objfile);
246 /* First, check the cache */
249 && pc >= ui->cache->region_start
250 && pc <= ui->cache->region_end)
253 /* Not in the cache, do a binary search */
258 while (first <= last)
260 middle = (first + last) / 2;
261 if (pc >= ui->table[middle].region_start
262 && pc <= ui->table[middle].region_end)
264 ui->cache = &ui->table[middle];
265 return &ui->table[middle];
268 if (pc < ui->table[middle].region_start)
273 } /* ALL_OBJFILES() */
278 find_return_regnum(pc)
281 struct unwind_table_entry *u;
283 u = find_unwind_entry (pc);
295 find_proc_framesize(pc)
298 struct unwind_table_entry *u;
303 u = find_unwind_entry (pc);
308 return u->Total_frame_size << 3;
314 struct unwind_table_entry *u;
316 u = find_unwind_entry (pc);
328 saved_pc_after_call (frame)
333 ret_regnum = find_return_regnum (get_frame_pc (frame));
335 return read_register (ret_regnum) & ~0x3;
339 frame_saved_pc (frame)
342 CORE_ADDR pc = get_frame_pc (frame);
344 if (frameless_look_for_prologue (frame))
348 ret_regnum = find_return_regnum (pc);
350 return read_register (ret_regnum) & ~0x3;
352 else if (rp_saved (pc))
353 return read_memory_integer (frame->frame - 20, 4) & ~0x3;
355 return read_register (RP_REGNUM) & ~0x3;
358 /* We need to correct the PC and the FP for the outermost frame when we are
362 init_extra_frame_info (fromleaf, frame)
364 struct frame_info *frame;
369 if (frame->next) /* Only do this for outermost frame */
372 flags = read_register (FLAGS_REGNUM);
373 if (flags & 2) /* In system call? */
374 frame->pc = read_register (31) & ~0x3;
376 /* The outermost frame is always derived from PC-framesize */
377 framesize = find_proc_framesize(frame->pc);
379 frame->frame = read_register (FP_REGNUM);
381 frame->frame = read_register (SP_REGNUM) - framesize;
383 if (!frameless_look_for_prologue (frame)) /* Frameless? */
384 return; /* No, quit now */
386 /* For frameless functions, we need to look at the caller's frame */
387 framesize = find_proc_framesize(FRAME_SAVED_PC(frame));
389 frame->frame -= framesize;
394 struct frame_info *frame;
398 framesize = find_proc_framesize(FRAME_SAVED_PC(frame));
401 return frame->frame - framesize;
403 return read_memory_integer (frame->frame, 4);
406 /* To see if a frame chain is valid, see if the caller looks like it
407 was compiled with gcc. */
410 frame_chain_valid (chain, thisframe)
414 struct minimal_symbol *msym;
419 msym = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe));
422 && (strcmp (SYMBOL_NAME (msym), "_start") == 0))
429 /* Some helper functions. gcc_p returns 1 if the function beginning at
430 pc appears to have been compiled with gcc. hpux_cc_p returns 1 if
431 fn was compiled with hpux cc. gcc functions look like :
433 stw rp,-0x14(sp) ; optional
436 stwm r1,framesize(sp)
438 hpux cc functions look like:
440 stw rp,-0x14(sp) ; optional.
447 if (read_memory_integer (pc, 4) == 0x6BC23FD9)
450 if (read_memory_integer (pc, 4) == 0x8040241
451 && read_memory_integer (pc + 4, 4) == 0x81E0244)
458 * These functions deal with saving and restoring register state
459 * around a function call in the inferior. They keep the stack
460 * double-word aligned; eventually, on an hp700, the stack will have
461 * to be aligned to a 64-byte boundary.
467 register CORE_ADDR sp;
472 /* Space for "arguments"; the RP goes in here. */
473 sp = read_register (SP_REGNUM) + 48;
474 int_buffer = read_register (RP_REGNUM) | 0x3;
475 write_memory (sp - 20, (char *)&int_buffer, 4);
477 int_buffer = read_register (FP_REGNUM);
478 write_memory (sp, (char *)&int_buffer, 4);
480 write_register (FP_REGNUM, sp);
484 for (regnum = 1; regnum < 32; regnum++)
485 if (regnum != RP_REGNUM && regnum != FP_REGNUM)
486 sp = push_word (sp, read_register (regnum));
490 for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++)
492 read_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8);
493 sp = push_bytes (sp, (char *)&freg_buffer, 8);
495 sp = push_word (sp, read_register (IPSW_REGNUM));
496 sp = push_word (sp, read_register (SAR_REGNUM));
497 sp = push_word (sp, read_register (PCOQ_HEAD_REGNUM));
498 sp = push_word (sp, read_register (PCSQ_HEAD_REGNUM));
499 sp = push_word (sp, read_register (PCOQ_TAIL_REGNUM));
500 sp = push_word (sp, read_register (PCSQ_TAIL_REGNUM));
501 write_register (SP_REGNUM, sp);
504 find_dummy_frame_regs (frame, frame_saved_regs)
505 struct frame_info *frame;
506 struct frame_saved_regs *frame_saved_regs;
508 CORE_ADDR fp = frame->frame;
511 frame_saved_regs->regs[RP_REGNUM] = fp - 20 & ~0x3;
512 frame_saved_regs->regs[FP_REGNUM] = fp;
513 frame_saved_regs->regs[1] = fp + 8;
514 frame_saved_regs->regs[3] = fp + 12;
516 for (fp += 16, i = 5; i < 32; fp += 4, i++)
517 frame_saved_regs->regs[i] = fp;
520 for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8)
521 frame_saved_regs->regs[i] = fp;
523 frame_saved_regs->regs[IPSW_REGNUM] = fp;
525 frame_saved_regs->regs[SAR_REGNUM] = fp;
527 frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp;
529 frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp;
531 frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp;
533 frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp;
539 register FRAME frame = get_current_frame ();
540 register CORE_ADDR fp;
542 struct frame_saved_regs fsr;
543 struct frame_info *fi;
546 fi = get_frame_info (frame);
548 get_frame_saved_regs (fi, &fsr);
550 if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */
551 hp_restore_pc_queue (&fsr);
553 for (regnum = 31; regnum > 0; regnum--)
554 if (fsr.regs[regnum])
555 write_register (regnum, read_memory_integer (fsr.regs[regnum], 4));
557 for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM ; regnum--)
558 if (fsr.regs[regnum])
560 read_memory (fsr.regs[regnum], (char *)&freg_buffer, 8);
561 write_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8);
564 if (fsr.regs[IPSW_REGNUM])
565 write_register (IPSW_REGNUM,
566 read_memory_integer (fsr.regs[IPSW_REGNUM], 4));
568 if (fsr.regs[SAR_REGNUM])
569 write_register (SAR_REGNUM,
570 read_memory_integer (fsr.regs[SAR_REGNUM], 4));
572 if (fsr.regs[PCOQ_TAIL_REGNUM])
573 write_register (PCOQ_TAIL_REGNUM,
574 read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4));
576 write_register (FP_REGNUM, read_memory_integer (fp, 4));
578 if (fsr.regs[IPSW_REGNUM]) /* call dummy */
579 write_register (SP_REGNUM, fp - 48);
581 write_register (SP_REGNUM, fp);
583 flush_cached_frames ();
584 set_current_frame (create_new_frame (read_register (FP_REGNUM),
589 * After returning to a dummy on the stack, restore the instruction
590 * queue space registers. */
593 hp_restore_pc_queue (fsr)
594 struct frame_saved_regs *fsr;
596 CORE_ADDR pc = read_pc ();
597 CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM], 4);
602 /* Advance past break instruction in the call dummy. */
603 write_register (PCOQ_HEAD_REGNUM, pc + 4);
604 write_register (PCOQ_TAIL_REGNUM, pc + 8);
607 * HPUX doesn't let us set the space registers or the space
608 * registers of the PC queue through ptrace. Boo, hiss.
609 * Conveniently, the call dummy has this sequence of instructions
614 * So, load up the registers and single step until we are in the
618 write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], 4));
619 write_register (22, new_pc);
621 for (insn_count = 0; insn_count < 3; insn_count++)
628 stop_signal = WTERMSIG (w);
629 terminal_ours_for_output ();
630 printf ("\nProgram terminated with signal %d, %s\n",
631 stop_signal, safe_strsignal (stop_signal));
636 fetch_inferior_registers (-1);
641 hp_push_arguments (nargs, args, sp, struct_return, struct_addr)
646 CORE_ADDR struct_addr;
648 /* array of arguments' offsets */
649 int *offset = (int *)alloca(nargs);
653 for (i = 0; i < nargs; i++)
655 cum += TYPE_LENGTH (VALUE_TYPE (args[i]));
657 /* value must go at proper alignment. Assume alignment is a
659 alignment = hp_alignof (VALUE_TYPE (args[i]));
661 cum = (cum + alignment) & -alignment;
664 sp += min ((cum + 7) & -8, 16);
666 for (i = 0; i < nargs; i++)
667 write_memory (sp + offset[i], VALUE_CONTENTS (args[i]),
668 TYPE_LENGTH (VALUE_TYPE (args[i])));
671 write_register (28, struct_addr);
675 /* return the alignment of a type in bytes. Structures have the maximum
676 alignment required by their fields. */
682 int max_align, align, i;
683 switch (TYPE_CODE (arg))
688 return TYPE_LENGTH (arg);
689 case TYPE_CODE_ARRAY:
690 return hp_alignof (TYPE_FIELD_TYPE (arg, 0));
691 case TYPE_CODE_STRUCT:
692 case TYPE_CODE_UNION:
694 for (i = 0; i < TYPE_NFIELDS (arg); i++)
696 /* Bit fields have no real alignment. */
697 if (!TYPE_FIELD_BITPOS (arg, i))
699 align = hp_alignof (TYPE_FIELD_TYPE (arg, i));
700 max_align = max (max_align, align);
709 /* Print the register regnum, or all registers if regnum is -1 */
711 pa_do_registers_info (regnum, fpregs)
715 char raw_regs [REGISTER_BYTES];
718 for (i = 0; i < NUM_REGS; i++)
719 read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i));
721 pa_print_registers (raw_regs, regnum, fpregs);
722 else if (regnum < FP0_REGNUM)
723 printf ("%s %x\n", reg_names[regnum], *(long *)(raw_regs +
724 REGISTER_BYTE (regnum)));
726 pa_print_fp_reg (regnum);
729 pa_print_registers (raw_regs, regnum, fpregs)
736 for (i = 0; i < 18; i++)
737 printf ("%8.8s: %8x %8.8s: %8x %8.8s: %8x %8.8s: %8x\n",
739 *(int *)(raw_regs + REGISTER_BYTE (i)),
741 *(int *)(raw_regs + REGISTER_BYTE (i + 18)),
743 *(int *)(raw_regs + REGISTER_BYTE (i + 36)),
745 *(int *)(raw_regs + REGISTER_BYTE (i + 54)));
748 for (i = 72; i < NUM_REGS; i++)
755 unsigned char raw_buffer[MAX_REGISTER_RAW_SIZE];
756 unsigned char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
759 /* Get the data in raw format, then convert also to virtual format. */
760 read_relative_register_raw_bytes (i, raw_buffer);
761 REGISTER_CONVERT_TO_VIRTUAL (i, raw_buffer, virtual_buffer);
763 fputs_filtered (reg_names[i], stdout);
764 print_spaces_filtered (15 - strlen (reg_names[i]), stdout);
766 val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, stdout, 0,
767 1, 0, Val_pretty_default);
768 printf_filtered ("\n");
771 /* Function calls that pass into a new compilation unit must pass through a
772 small piece of code that does long format (`external' in HPPA parlance)
773 jumps. We figure out where the trampoline is going to end up, and return
774 the PC of the final destination. If we aren't in a trampoline, we just
777 For computed calls, we just extract the new PC from r22. */
780 skip_trampoline_code (pc, name)
785 static CORE_ADDR dyncall = 0;
786 struct minimal_symbol *msym;
788 /* FIXME XXX - dyncall must be initialized whenever we get a new exec file */
792 msym = lookup_minimal_symbol ("$$dyncall", NULL);
794 dyncall = SYMBOL_VALUE_ADDRESS (msym);
800 return (CORE_ADDR)(read_register (22) & ~0x3);
802 inst0 = read_memory_integer (pc, 4);
803 inst1 = read_memory_integer (pc+4, 4);
805 if ( (inst0 & 0xffe00000) == 0x20200000 /* ldil xxx, r1 */
806 && (inst1 & 0xffe0e002) == 0xe0202002) /* be,n yyy(sr4, r1) */
807 pc = extract_21 (inst0) + extract_17 (inst1);
809 pc = (CORE_ADDR)NULL;
814 /* Advance PC across any function entry prologue instructions
815 to reach some "real" code. */
817 /* skip (stw rp, -20(0,sp)); copy 4,1; copy sp, 4; stwm 1,framesize(sp)
818 for gcc, or (stw rp, -20(0,sp); stwm 1, framesize(sp) for hcc */
827 status = target_read_memory (pc, (char *)&inst, 4);
828 SWAP_TARGET_AND_HOST (&inst, sizeof (inst));
832 if (inst == 0x6BC23FD9) /* stw rp,-20(sp) */
834 if (read_memory_integer (pc + 4, 4) == 0x8040241) /* copy r4,r1 */
836 else if ((read_memory_integer (pc + 4, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */
839 else if (read_memory_integer (pc, 4) == 0x8040241) /* copy r4,r1 */
841 else if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */
848 unwind_command (exp, from_tty)
856 struct unwind_table_entry *u;
859 /* If we have an expression, evaluate it and use it as the address. */
861 if (exp != 0 && *exp != 0)
862 address = parse_and_eval_address (exp);
866 xxx.u = find_unwind_entry (address);
870 printf ("Can't find unwind table entry for PC 0x%x\n", address);
874 printf ("%08x\n%08X\n%08X\n%08X\n", xxx.foo[0], xxx.foo[1], xxx.foo[2],
879 _initialize_hppah_tdep ()
881 add_com ("unwind", class_obscure, unwind_command, "Print unwind info\n");
883 (add_set_cmd ("use_unwind", class_obscure, var_boolean,
885 "Set the usage of unwind info", &setlist),