-/* Machine-dependent code which would otherwise be in inflow.c and core.c,
- for GDB, the GNU debugger. This code is for the HP PA-RISC cpu.
- Copyright 1986, 1987, 1989, 1990, 1991, 1992 Free Software Foundation, Inc.
-
- Contributed by the Center for Software Science at the
- University of Utah (pa-gdb-bugs@cs.utah.edu).
-
-This file is part of GDB.
-
-This program is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2 of the License, or
-(at your option) any later version.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-#include "defs.h"
-#include "frame.h"
-#include "inferior.h"
-#include "value.h"
-
-/* For argument passing to the inferior */
-#include "symtab.h"
-
-#ifdef USG
-#include <sys/types.h>
-#endif
-
-#include <sys/param.h>
-#include <sys/dir.h>
-#include <signal.h>
-#include <sys/ioctl.h>
-
-#ifdef COFF_ENCAPSULATE
-#include "a.out.encap.h"
-#else
-#include <a.out.h>
-#endif
-#ifndef N_SET_MAGIC
-#define N_SET_MAGIC(exec, val) ((exec).a_magic = (val))
-#endif
-
-/*#include <sys/user.h> After a.out.h */
-#include <sys/file.h>
-#include <sys/stat.h>
-#include <machine/psl.h>
-#include "wait.h"
-
-#include "gdbcore.h"
-#include "gdbcmd.h"
-#include "target.h"
-
-\f
-/* Last modification time of executable file.
- Also used in source.c to compare against mtime of a source file. */
-
-extern int exec_mtime;
-
-/* Virtual addresses of bounds of the two areas of memory in the core file. */
-
-/* extern CORE_ADDR data_start; */
-extern CORE_ADDR data_end;
-extern CORE_ADDR stack_start;
-extern CORE_ADDR stack_end;
-
-/* Virtual addresses of bounds of two areas of memory in the exec file.
- Note that the data area in the exec file is used only when there is no core file. */
-
-extern CORE_ADDR text_start;
-extern CORE_ADDR text_end;
-
-extern CORE_ADDR exec_data_start;
-extern CORE_ADDR exec_data_end;
-
-/* Address in executable file of start of text area data. */
-
-extern int text_offset;
-
-/* Address in executable file of start of data area data. */
-
-extern int exec_data_offset;
-
-/* Address in core file of start of data area data. */
-
-extern int data_offset;
-
-/* Address in core file of start of stack area data. */
-
-extern int stack_offset;
-
-struct header file_hdr;
-struct som_exec_auxhdr exec_hdr;
-\f
-/* Routines to extract various sized constants out of hppa
- instructions. */
-
-/* This assumes that no garbage lies outside of the lower bits of
- value. */
-
-int
-sign_extend (val, bits)
- unsigned val, bits;
-{
- return (int)(val >> bits - 1 ? (-1 << bits) | val : val);
-}
-
-/* For many immediate values the sign bit is the low bit! */
-
-int
-low_sign_extend (val, bits)
- unsigned val, bits;
-{
- return (int)((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1);
-}
-/* extract the immediate field from a ld{bhw}s instruction */
-
-
-
-unsigned
-get_field (val, from, to)
- unsigned val, from, to;
-{
- val = val >> 31 - to;
- return val & ((1 << 32 - from) - 1);
-}
-
-unsigned
-set_field (val, from, to, new_val)
- unsigned *val, from, to;
-{
- unsigned mask = ~((1 << (to - from + 1)) << (31 - from));
- return *val = *val & mask | (new_val << (31 - from));
-}
-
-/* extract a 3-bit space register number from a be, ble, mtsp or mfsp */
-
-extract_3 (word)
- unsigned word;
-{
- return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17);
-}
-
-extract_5_load (word)
- unsigned word;
-{
- return low_sign_extend (word >> 16 & MASK_5, 5);
-}
-
-/* extract the immediate field from a st{bhw}s instruction */
-
-int
-extract_5_store (word)
- unsigned word;
-{
- return low_sign_extend (word & MASK_5, 5);
-}
-
-/* extract an 11 bit immediate field */
-
-int
-extract_11 (word)
- unsigned word;
-{
- return low_sign_extend (word & MASK_11, 11);
-}
-
-/* extract a 14 bit immediate field */
-
-int
-extract_14 (word)
- unsigned word;
-{
- return low_sign_extend (word & MASK_14, 14);
-}
-
-/* deposit a 14 bit constant in a word */
-
-unsigned
-deposit_14 (opnd, word)
- int opnd;
- unsigned word;
-{
- unsigned sign = (opnd < 0 ? 1 : 0);
-
- return word | ((unsigned)opnd << 1 & MASK_14) | sign;
-}
-
-/* extract a 21 bit constant */
-
-int
-extract_21 (word)
- unsigned word;
-{
- int val;
-
- word &= MASK_21;
- word <<= 11;
- val = GET_FIELD (word, 20, 20);
- val <<= 11;
- val |= GET_FIELD (word, 9, 19);
- val <<= 2;
- val |= GET_FIELD (word, 5, 6);
- val <<= 5;
- val |= GET_FIELD (word, 0, 4);
- val <<= 2;
- val |= GET_FIELD (word, 7, 8);
- return sign_extend (val, 21) << 11;
-}
-
-/* deposit a 21 bit constant in a word. Although 21 bit constants are
- usually the top 21 bits of a 32 bit constant, we assume that only
- the low 21 bits of opnd are relevant */
-
-unsigned
-deposit_21 (opnd, word)
- unsigned opnd, word;
-{
- unsigned val = 0;
-
- val |= GET_FIELD (opnd, 11 + 14, 11 + 18);
- val <<= 2;
- val |= GET_FIELD (opnd, 11 + 12, 11 + 13);
- val <<= 2;
- val |= GET_FIELD (opnd, 11 + 19, 11 + 20);
- val <<= 11;
- val |= GET_FIELD (opnd, 11 + 1, 11 + 11);
- val <<= 1;
- val |= GET_FIELD (opnd, 11 + 0, 11 + 0);
- return word | val;
-}
-
-/* extract a 12 bit constant from branch instructions */
-
-int
-extract_12 (word)
- unsigned word;
-{
- return sign_extend (GET_FIELD (word, 19, 28) |
- GET_FIELD (word, 29, 29) << 10 |
- (word & 0x1) << 11, 12) << 2;
-}
-
-/* extract a 17 bit constant from branch instructions, returning the
- 19 bit signed value. */
-
-int
-extract_17 (word)
- unsigned word;
-{
- return sign_extend (GET_FIELD (word, 19, 28) |
- GET_FIELD (word, 29, 29) << 10 |
- GET_FIELD (word, 11, 15) << 11 |
- (word & 0x1) << 16, 17) << 2;
-}
-\f
-CORE_ADDR
-frame_saved_pc (frame)
- FRAME frame;
-{
- if (get_current_frame () == frame)
- {
- struct frame_saved_regs saved_regs;
- CORE_ADDR pc = get_frame_pc (frame);
- int flags;
-
- flags = read_register (FLAGS_REGNUM);
- get_frame_saved_regs (frame, &saved_regs);
- if (pc >= millicode_start && pc < millicode_end
- || (flags & 2)) /* In system call? */
- return read_register (31) & ~3;
- else if (saved_regs.regs[RP_REGNUM])
- return read_memory_integer (saved_regs.regs[RP_REGNUM], 4) & ~3;
- else
- return read_register (RP_REGNUM) & ~3;
- }
- return read_memory_integer (frame->frame - 20, 4) & ~0x3;
-}
-
-/* To see if a frame chain is valid, see if the caller looks like it
- was compiled with gcc. */
-
-int frame_chain_valid (chain, thisframe)
- FRAME_ADDR chain;
- FRAME thisframe;
-{
- if (chain && (chain > 0x60000000))
- {
- CORE_ADDR pc = get_pc_function_start (FRAME_SAVED_PC (thisframe));
-
- if (inside_entry_file (pc))
- return 0;
- /* look for stw rp, -20(0,sp); copy 4,1; copy sp, 4 */
- if (read_memory_integer (pc, 4) == 0x6BC23FD9)
- pc = pc + 4;
-
- if (read_memory_integer (pc, 4) == 0x8040241 &&
- read_memory_integer (pc + 4, 4) == 0x81E0244)
- return 1;
- else
- return 0;
- }
- else
- return 0;
-}
-
-/* Some helper functions. gcc_p returns 1 if the function beginning at
- pc appears to have been compiled with gcc. hpux_cc_p returns 1 if
- fn was compiled with hpux cc. gcc functions look like :
-
- stw rp,-0x14(sp) ; optional
- or r4,r0,r1
- or sp,r0,r4
- stwm r1,framesize(sp)
-
- hpux cc functions look like:
-
- stw rp,-0x14(sp) ; optional.
- stwm r3,framesiz(sp)
- */
-
-gcc_p (pc)
- CORE_ADDR pc;
-{
- if (read_memory_integer (pc, 4) == 0x6BC23FD9)
- pc = pc + 4;
-
- if (read_memory_integer (pc, 4) == 0x8040241 &&
- read_memory_integer (pc + 4, 4) == 0x81E0244)
- return 1;
- return 0;
-}
-
-/*
- * These functions deal with saving and restoring register state
- * around a function call in the inferior. They keep the stack
- * double-word aligned; eventually, on an hp700, the stack will have
- * to be aligned to a 64-byte boundary.
- */
-
-int
-push_dummy_frame ()
-{
- register CORE_ADDR sp = read_register (SP_REGNUM);
- register int regnum;
- int int_buffer;
- double freg_buffer;
- /* Space for "arguments"; the RP goes in here. */
- sp += 48;
- int_buffer = read_register (RP_REGNUM) | 0x3;
- write_memory (sp - 20, (char *)&int_buffer, 4);
- int_buffer = read_register (FP_REGNUM);
- write_memory (sp, (char *)&int_buffer, 4);
- write_register (FP_REGNUM, sp);
- sp += 8;
- for (regnum = 1; regnum < 32; regnum++)
- if (regnum != RP_REGNUM && regnum != FP_REGNUM)
- sp = push_word (sp, read_register (regnum));
- sp += 4;
- for (regnum = FP0_REGNUM; regnum < NUM_REGS; regnum++)
- { read_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8);
- sp = push_bytes (sp, (char *)&freg_buffer, 8);}
- sp = push_word (sp, read_register (IPSW_REGNUM));
- sp = push_word (sp, read_register (SAR_REGNUM));
- sp = push_word (sp, read_register (PCOQ_HEAD_REGNUM));
- sp = push_word (sp, read_register (PCSQ_HEAD_REGNUM));
- sp = push_word (sp, read_register (PCOQ_TAIL_REGNUM));
- sp = push_word (sp, read_register (PCSQ_TAIL_REGNUM));
- write_register (SP_REGNUM, sp);
-}
-
-find_dummy_frame_regs (frame, frame_saved_regs)
- struct frame_info *frame;
- struct frame_saved_regs *frame_saved_regs;
-{
- CORE_ADDR fp = frame->frame;
- int i;
-
- frame_saved_regs->regs[RP_REGNUM] = fp - 20 & ~0x3;
- frame_saved_regs->regs[FP_REGNUM] = fp;
- frame_saved_regs->regs[1] = fp + 8;
- frame_saved_regs->regs[3] = fp + 12;
- for (fp += 16, i = 5; i < 32; fp += 4, i++)
- frame_saved_regs->regs[i] = fp;
- fp += 4;
- for (i = FP0_REGNUM; i < NUM_REGS; i++, fp += 8)
- frame_saved_regs->regs[i] = fp;
- frame_saved_regs->regs[IPSW_REGNUM] = fp; fp += 4;
- frame_saved_regs->regs[SAR_REGNUM] = fp; fp += 4;
- frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp; fp +=4;
- frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp; fp +=4;
- frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp; fp +=4;
- frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp;
-}
-
-int
-hp_pop_frame ()
-{
- register FRAME frame = get_current_frame ();
- register CORE_ADDR fp;
- register int regnum;
- struct frame_saved_regs fsr;
- struct frame_info *fi;
- double freg_buffer;
- fi = get_frame_info (frame);
- fp = fi->frame;
- get_frame_saved_regs (fi, &fsr);
- if (fsr.regs[IPSW_REGNUM]) /* Restoring a call dummy frame */
- hp_restore_pc_queue (&fsr);
- for (regnum = 31; regnum > 0; regnum--)
- if (fsr.regs[regnum])
- write_register (regnum, read_memory_integer (fsr.regs[regnum], 4));
- for (regnum = NUM_REGS - 1; regnum >= FP0_REGNUM ; regnum--)
- if (fsr.regs[regnum])
- { read_memory (fsr.regs[regnum], (char *)&freg_buffer, 8);
- write_register_bytes (REGISTER_BYTE (regnum), (char *)&freg_buffer, 8);
- }
- if (fsr.regs[IPSW_REGNUM])
- write_register (IPSW_REGNUM,
- read_memory_integer (fsr.regs[IPSW_REGNUM], 4));
- if (fsr.regs[SAR_REGNUM])
- write_register (SAR_REGNUM,
- read_memory_integer (fsr.regs[SAR_REGNUM], 4));
- if (fsr.regs[PCOQ_TAIL_REGNUM])
- write_register (PCOQ_TAIL_REGNUM,
- read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4));
- write_register (FP_REGNUM, read_memory_integer (fp, 4));
- if (fsr.regs[IPSW_REGNUM]) /* call dummy */
- write_register (SP_REGNUM, fp - 48);
- else
- write_register (SP_REGNUM, fp);
- flush_cached_frames ();
- set_current_frame (create_new_frame (read_register (FP_REGNUM),
- read_pc ()));
-}
-
-/*
- * After returning to a dummy on the stack, restore the instruction
- * queue space registers. */
-
-int
-hp_restore_pc_queue (fsr)
- struct frame_saved_regs *fsr;
-{
- CORE_ADDR pc = read_pc ();
- CORE_ADDR new_pc = read_memory_integer (fsr->regs[PCOQ_HEAD_REGNUM], 4);
- int pid;
- WAITTYPE w;
- int insn_count;
-
- /* Advance past break instruction in the call dummy. */
- pc += 4; write_register (PCOQ_HEAD_REGNUM, pc);
- pc += 4; write_register (PCOQ_TAIL_REGNUM, pc);
-
- /*
- * HPUX doesn't let us set the space registers or the space
- * registers of the PC queue through ptrace. Boo, hiss.
- * Conveniently, the call dummy has this sequence of instructions
- * after the break:
- * mtsp r21, sr0
- * ble,n 0(sr0, r22)
- *
- * So, load up the registers and single step until we are in the
- * right place.
- */
-
- write_register (21, read_memory_integer (fsr->regs[PCSQ_HEAD_REGNUM], 4));
- write_register (22, new_pc);
-
- for (insn_count = 0; insn_count < 3; insn_count++)
- {
- resume (1, 0);
- target_wait(&w);
-
- if (!WIFSTOPPED (w))
- {
- stop_signal = WTERMSIG (w);
- terminal_ours_for_output ();
- printf ("\nProgram terminated with signal %d, %s\n",
- stop_signal, safe_strsignal (stop_signal));
- fflush (stdout);
- return 0;
- }
- }
- fetch_inferior_registers (-1);
- return 1;
-}
-
-CORE_ADDR
-hp_push_arguments (nargs, args, sp, struct_return, struct_addr)
- int nargs;
- value *args;
- CORE_ADDR sp;
- int struct_return;
- CORE_ADDR struct_addr;
-{
- /* array of arguments' offsets */
- int *offset = (int *)alloca(nargs);
- int cum = 0;
- int i, alignment;
-
- for (i = 0; i < nargs; i++)
- {
- cum += TYPE_LENGTH (VALUE_TYPE (args[i]));
- /* value must go at proper alignment. Assume alignment is a
- power of two.*/
- alignment = hp_alignof (VALUE_TYPE (args[i]));
- if (cum % alignment)
- cum = (cum + alignment) & -alignment;
- offset[i] = -cum;
- }
- sp += min ((cum + 7) & -8, 16);
- for (i = 0; i < nargs; i++)
- {
- write_memory (sp + offset[i], VALUE_CONTENTS (args[i]),
- TYPE_LENGTH (VALUE_TYPE (args[i])));
- }
- if (struct_return)
- write_register (28, struct_addr);
- return sp + 32;
-}
-
-/* return the alignment of a type in bytes. Structures have the maximum
- alignment required by their fields. */
-
-int
-hp_alignof (arg)
- struct type *arg;
-{
- int max_align, align, i;
- switch (TYPE_CODE (arg))
- {
- case TYPE_CODE_PTR:
- case TYPE_CODE_INT:
- case TYPE_CODE_FLT:
- return TYPE_LENGTH (arg);
- case TYPE_CODE_ARRAY:
- return hp_alignof (TYPE_FIELD_TYPE (arg, 0));
- case TYPE_CODE_STRUCT:
- case TYPE_CODE_UNION:
- max_align = 2;
- for (i = 0; i < TYPE_NFIELDS (arg); i++)
- {
- /* Bit fields have no real alignment. */
- if (!TYPE_FIELD_BITPOS (arg, i))
- {
- align = hp_alignof (TYPE_FIELD_TYPE (arg, i));
- max_align = max (max_align, align);
- }
- }
- return max_align;
- default:
- return 4;
- }
-}
-
-/* Print the register regnum, or all registers if regnum is -1 */
-
-pa_do_registers_info (regnum, fpregs)
- int regnum;
- int fpregs;
-{
- char raw_regs [REGISTER_BYTES];
- int i;
-
- for (i = 0; i < NUM_REGS; i++)
- read_relative_register_raw_bytes (i, raw_regs + REGISTER_BYTE (i));
- if (regnum == -1)
- pa_print_registers (raw_regs, regnum, fpregs);
- else if (regnum < FP0_REGNUM)
- {
- printf ("%s %x\n", reg_names[regnum], *(long *)(raw_regs +
- REGISTER_BYTE (regnum)));
- }
- else
- pa_print_fp_reg (regnum);
-}
-
-pa_print_registers (raw_regs, regnum, fpregs)
- char *raw_regs;
- int regnum;
- int fpregs;
-{
- int i;
-
- for (i = 0; i < 18; i++)
- printf ("%8.8s: %8x %8.8s: %8x %8.8s: %8x %8.8s: %8x\n",
- reg_names[i],
- *(int *)(raw_regs + REGISTER_BYTE (i)),
- reg_names[i + 18],
- *(int *)(raw_regs + REGISTER_BYTE (i + 18)),
- reg_names[i + 36],
- *(int *)(raw_regs + REGISTER_BYTE (i + 36)),
- reg_names[i + 54],
- *(int *)(raw_regs + REGISTER_BYTE (i + 54)));
-
- if (fpregs)
- for (i = 72; i < NUM_REGS; i++)
- pa_print_fp_reg (i);
-}
-
-pa_print_fp_reg (i)
- int i;
-{
- unsigned char raw_buffer[MAX_REGISTER_RAW_SIZE];
- unsigned char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
- REGISTER_TYPE val;
-
- /* Get the data in raw format, then convert also to virtual format. */
- read_relative_register_raw_bytes (i, raw_buffer);
- REGISTER_CONVERT_TO_VIRTUAL (i, raw_buffer, virtual_buffer);
-
- fputs_filtered (reg_names[i], stdout);
- print_spaces_filtered (15 - strlen (reg_names[i]), stdout);
-
- val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, stdout, 0,
- 1, 0, Val_pretty_default);
- printf_filtered ("\n");
-
-}
-
-/* Function calls that pass into a new compilation unit must pass through a
- small piece of code that does long format (`external' in HPPA parlance)
- jumps. We figure out where the trampoline is going to end up, and return
- the PC of the final destination. If we aren't in a trampoline, we just
- return NULL. */
-
-CORE_ADDR
-skip_trampoline_code (pc)
- CORE_ADDR pc;
-{
- long inst0, inst1;
-
- inst0 = read_memory_integer (pc, 4);
- inst1 = read_memory_integer (pc+4, 4);
-
- if ( (inst0 & 0xffe00000) == 0x20200000 /* ldil xxx, r1 */
- && (inst1 & 0xffe0e002) == 0xe0202002) /* be,n yyy(sr4, r1) */
- pc = extract_21 (inst0) + extract_17 (inst1);
- else
- pc = NULL;
-
- return pc;
-}
projects / deliverable / binutils-gdb.git / blobdiff