1243 lines
31 KiB
C
1243 lines
31 KiB
C
/* Machine-dependent code which would otherwise be in inflow.c and core.c,
|
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for GDB, the GNU debugger. This code is for the HP PA-RISC cpu.
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Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
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Contributed by the Center for Software Science at the
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University of Utah (pa-gdb-bugs@cs.utah.edu).
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||
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This file is part of GDB.
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||
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
|
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "value.h"
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/* For argument passing to the inferior */
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#include "symtab.h"
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#ifdef USG
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#include <sys/types.h>
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#endif
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#include <sys/param.h>
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#include <sys/dir.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#ifdef COFF_ENCAPSULATE
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#include "a.out.encap.h"
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#else
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#include <a.out.h>
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#endif
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#ifndef N_SET_MAGIC
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#define N_SET_MAGIC(exec, val) ((exec).a_magic = (val))
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#endif
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/*#include <sys/user.h> After a.out.h */
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <machine/psl.h>
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#include "wait.h"
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#include "gdbcore.h"
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#include "gdbcmd.h"
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#include "target.h"
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#include "symfile.h"
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#include "objfiles.h"
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static int restore_pc_queue PARAMS ((struct frame_saved_regs *fsr));
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static int hppa_alignof PARAMS ((struct type *arg));
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static FRAME_ADDR dig_fp_from_stack PARAMS ((FRAME frame,
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struct unwind_table_entry *u));
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CORE_ADDR frame_saved_pc PARAMS ((FRAME frame));
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/* Routines to extract various sized constants out of hppa
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instructions. */
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/* This assumes that no garbage lies outside of the lower bits of
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value. */
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int
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sign_extend (val, bits)
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unsigned val, bits;
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{
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return (int)(val >> bits - 1 ? (-1 << bits) | val : val);
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}
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/* For many immediate values the sign bit is the low bit! */
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int
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low_sign_extend (val, bits)
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unsigned val, bits;
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{
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return (int)((val & 0x1 ? (-1 << (bits - 1)) : 0) | val >> 1);
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}
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/* extract the immediate field from a ld{bhw}s instruction */
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unsigned
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get_field (val, from, to)
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unsigned val, from, to;
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{
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val = val >> 31 - to;
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return val & ((1 << 32 - from) - 1);
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}
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unsigned
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set_field (val, from, to, new_val)
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unsigned *val, from, to;
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{
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unsigned mask = ~((1 << (to - from + 1)) << (31 - from));
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return *val = *val & mask | (new_val << (31 - from));
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}
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/* extract a 3-bit space register number from a be, ble, mtsp or mfsp */
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extract_3 (word)
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unsigned word;
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{
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return GET_FIELD (word, 18, 18) << 2 | GET_FIELD (word, 16, 17);
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}
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extract_5_load (word)
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unsigned word;
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{
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return low_sign_extend (word >> 16 & MASK_5, 5);
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}
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/* extract the immediate field from a st{bhw}s instruction */
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int
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extract_5_store (word)
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unsigned word;
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{
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return low_sign_extend (word & MASK_5, 5);
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}
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/* extract the immediate field from a break instruction */
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unsigned
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extract_5r_store (word)
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unsigned word;
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{
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return (word & MASK_5);
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}
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/* extract the immediate field from a {sr}sm instruction */
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unsigned
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extract_5R_store (word)
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unsigned word;
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{
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return (word >> 16 & MASK_5);
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}
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/* extract an 11 bit immediate field */
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int
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extract_11 (word)
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unsigned word;
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{
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return low_sign_extend (word & MASK_11, 11);
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}
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/* extract a 14 bit immediate field */
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int
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extract_14 (word)
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unsigned word;
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{
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return low_sign_extend (word & MASK_14, 14);
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}
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/* deposit a 14 bit constant in a word */
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unsigned
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deposit_14 (opnd, word)
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int opnd;
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unsigned word;
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{
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unsigned sign = (opnd < 0 ? 1 : 0);
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return word | ((unsigned)opnd << 1 & MASK_14) | sign;
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}
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/* extract a 21 bit constant */
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int
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extract_21 (word)
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unsigned word;
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{
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int val;
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word &= MASK_21;
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word <<= 11;
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val = GET_FIELD (word, 20, 20);
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val <<= 11;
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val |= GET_FIELD (word, 9, 19);
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val <<= 2;
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val |= GET_FIELD (word, 5, 6);
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val <<= 5;
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val |= GET_FIELD (word, 0, 4);
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val <<= 2;
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val |= GET_FIELD (word, 7, 8);
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return sign_extend (val, 21) << 11;
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}
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/* deposit a 21 bit constant in a word. Although 21 bit constants are
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usually the top 21 bits of a 32 bit constant, we assume that only
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the low 21 bits of opnd are relevant */
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unsigned
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deposit_21 (opnd, word)
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unsigned opnd, word;
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{
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unsigned val = 0;
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val |= GET_FIELD (opnd, 11 + 14, 11 + 18);
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val <<= 2;
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val |= GET_FIELD (opnd, 11 + 12, 11 + 13);
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val <<= 2;
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val |= GET_FIELD (opnd, 11 + 19, 11 + 20);
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val <<= 11;
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val |= GET_FIELD (opnd, 11 + 1, 11 + 11);
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val <<= 1;
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val |= GET_FIELD (opnd, 11 + 0, 11 + 0);
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return word | val;
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}
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/* extract a 12 bit constant from branch instructions */
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int
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extract_12 (word)
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unsigned word;
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{
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return sign_extend (GET_FIELD (word, 19, 28) |
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GET_FIELD (word, 29, 29) << 10 |
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(word & 0x1) << 11, 12) << 2;
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}
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/* extract a 17 bit constant from branch instructions, returning the
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19 bit signed value. */
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int
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extract_17 (word)
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unsigned word;
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{
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return sign_extend (GET_FIELD (word, 19, 28) |
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GET_FIELD (word, 29, 29) << 10 |
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GET_FIELD (word, 11, 15) << 11 |
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(word & 0x1) << 16, 17) << 2;
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}
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/* Lookup the unwind (stack backtrace) info for the given PC. We search all
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of the objfiles seeking the unwind table entry for this PC. Each objfile
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contains a sorted list of struct unwind_table_entry. Since we do a binary
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search of the unwind tables, we depend upon them to be sorted. */
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static struct unwind_table_entry *
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find_unwind_entry(pc)
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CORE_ADDR pc;
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{
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int first, middle, last;
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struct objfile *objfile;
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ALL_OBJFILES (objfile)
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{
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struct obj_unwind_info *ui;
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ui = OBJ_UNWIND_INFO (objfile);
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if (!ui)
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continue;
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/* First, check the cache */
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if (ui->cache
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&& pc >= ui->cache->region_start
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&& pc <= ui->cache->region_end)
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return ui->cache;
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/* Not in the cache, do a binary search */
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first = 0;
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last = ui->last;
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while (first <= last)
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{
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middle = (first + last) / 2;
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if (pc >= ui->table[middle].region_start
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&& pc <= ui->table[middle].region_end)
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{
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ui->cache = &ui->table[middle];
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return &ui->table[middle];
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}
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if (pc < ui->table[middle].region_start)
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last = middle - 1;
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else
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first = middle + 1;
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}
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} /* ALL_OBJFILES() */
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return NULL;
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}
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/* Called when no unwind descriptor was found for PC. Returns 1 if it
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appears that PC is in a linker stub. */
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static int pc_in_linker_stub PARAMS ((CORE_ADDR));
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static int
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pc_in_linker_stub (pc)
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CORE_ADDR pc;
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{
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int found_magic_instruction = 0;
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int i;
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char buf[4];
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||
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/* If unable to read memory, assume pc is not in a linker stub. */
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if (target_read_memory (pc, buf, 4) != 0)
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return 0;
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/* We are looking for something like
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; $$dyncall jams RP into this special spot in the frame (RP')
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; before calling the "call stub"
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ldw -18(sp),rp
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ldsid (rp),r1 ; Get space associated with RP into r1
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mtsp r1,sp ; Move it into space register 0
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be,n 0(sr0),rp) ; back to your regularly scheduled program
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*/
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/* Maximum known linker stub size is 4 instructions. Search forward
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from the given PC, then backward. */
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for (i = 0; i < 4; i++)
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{
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/* If we hit something with an unwind, stop searching this direction. */
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if (find_unwind_entry (pc + i * 4) != 0)
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break;
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/* Check for ldsid (rp),r1 which is the magic instruction for a
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return from a cross-space function call. */
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if (read_memory_integer (pc + i * 4, 4) == 0x004010a1)
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{
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found_magic_instruction = 1;
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break;
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}
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/* Add code to handle long call/branch and argument relocation stubs
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here. */
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}
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if (found_magic_instruction != 0)
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return 1;
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/* Now look backward. */
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for (i = 0; i < 4; i++)
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{
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/* If we hit something with an unwind, stop searching this direction. */
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if (find_unwind_entry (pc - i * 4) != 0)
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break;
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||
|
||
/* Check for ldsid (rp),r1 which is the magic instruction for a
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return from a cross-space function call. */
|
||
if (read_memory_integer (pc - i * 4, 4) == 0x004010a1)
|
||
{
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||
found_magic_instruction = 1;
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||
break;
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||
}
|
||
/* Add code to handle long call/branch and argument relocation stubs
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||
here. */
|
||
}
|
||
return found_magic_instruction;
|
||
}
|
||
|
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static int
|
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find_return_regnum(pc)
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CORE_ADDR pc;
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{
|
||
struct unwind_table_entry *u;
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u = find_unwind_entry (pc);
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||
|
||
if (!u)
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||
return RP_REGNUM;
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||
|
||
if (u->Millicode)
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return 31;
|
||
|
||
return RP_REGNUM;
|
||
}
|
||
|
||
/* Return size of frame, or -1 if we should use a frame pointer. */
|
||
int
|
||
find_proc_framesize(pc)
|
||
CORE_ADDR pc;
|
||
{
|
||
struct unwind_table_entry *u;
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||
|
||
u = find_unwind_entry (pc);
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||
|
||
if (!u)
|
||
{
|
||
if (pc_in_linker_stub (pc))
|
||
/* Linker stubs have a zero size frame. */
|
||
return 0;
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||
else
|
||
return -1;
|
||
}
|
||
|
||
if (u->Save_SP)
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||
/* If this bit is set, it means there is a frame pointer and we should
|
||
use it. */
|
||
return -1;
|
||
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||
return u->Total_frame_size << 3;
|
||
}
|
||
|
||
/* Return offset from sp at which rp is saved, or 0 if not saved. */
|
||
static int rp_saved PARAMS ((CORE_ADDR));
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||
|
||
static int
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||
rp_saved (pc)
|
||
CORE_ADDR pc;
|
||
{
|
||
struct unwind_table_entry *u;
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||
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||
u = find_unwind_entry (pc);
|
||
|
||
if (!u)
|
||
{
|
||
if (pc_in_linker_stub (pc))
|
||
/* This is the so-called RP'. */
|
||
return -24;
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
if (u->Save_RP)
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||
return -20;
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
int
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||
frameless_function_invocation (frame)
|
||
FRAME frame;
|
||
{
|
||
struct unwind_table_entry *u;
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||
|
||
u = find_unwind_entry (frame->pc);
|
||
|
||
if (u == 0)
|
||
return frameless_look_for_prologue (frame);
|
||
|
||
return (u->Total_frame_size == 0);
|
||
}
|
||
|
||
CORE_ADDR
|
||
saved_pc_after_call (frame)
|
||
FRAME frame;
|
||
{
|
||
int ret_regnum;
|
||
|
||
ret_regnum = find_return_regnum (get_frame_pc (frame));
|
||
|
||
return read_register (ret_regnum) & ~0x3;
|
||
}
|
||
|
||
CORE_ADDR
|
||
frame_saved_pc (frame)
|
||
FRAME frame;
|
||
{
|
||
CORE_ADDR pc = get_frame_pc (frame);
|
||
|
||
if (frameless_function_invocation (frame))
|
||
{
|
||
int ret_regnum;
|
||
|
||
ret_regnum = find_return_regnum (pc);
|
||
|
||
return read_register (ret_regnum) & ~0x3;
|
||
}
|
||
else
|
||
{
|
||
int rp_offset = rp_saved (pc);
|
||
|
||
if (rp_offset == 0)
|
||
return read_register (RP_REGNUM) & ~0x3;
|
||
else
|
||
return read_memory_integer (frame->frame + rp_offset, 4) & ~0x3;
|
||
}
|
||
}
|
||
|
||
/* We need to correct the PC and the FP for the outermost frame when we are
|
||
in a system call. */
|
||
|
||
void
|
||
init_extra_frame_info (fromleaf, frame)
|
||
int fromleaf;
|
||
struct frame_info *frame;
|
||
{
|
||
int flags;
|
||
int framesize;
|
||
|
||
if (frame->next) /* Only do this for outermost frame */
|
||
return;
|
||
|
||
flags = read_register (FLAGS_REGNUM);
|
||
if (flags & 2) /* In system call? */
|
||
frame->pc = read_register (31) & ~0x3;
|
||
|
||
/* The outermost frame is always derived from PC-framesize */
|
||
framesize = find_proc_framesize(frame->pc);
|
||
if (framesize == -1)
|
||
frame->frame = read_register (FP_REGNUM);
|
||
else
|
||
frame->frame = read_register (SP_REGNUM) - framesize;
|
||
|
||
if (!frameless_function_invocation (frame)) /* Frameless? */
|
||
return; /* No, quit now */
|
||
|
||
/* For frameless functions, we need to look at the caller's frame */
|
||
framesize = find_proc_framesize(FRAME_SAVED_PC(frame));
|
||
if (framesize != -1)
|
||
frame->frame -= framesize;
|
||
}
|
||
|
||
/* Given a GDB frame, determine the address of the calling function's frame.
|
||
This will be used to create a new GDB frame struct, and then
|
||
INIT_EXTRA_FRAME_INFO and INIT_FRAME_PC will be called for the new frame.
|
||
|
||
This may involve searching through prologues for several functions
|
||
at boundaries where GCC calls HP C code, or where code which has
|
||
a frame pointer calls code without a frame pointer. */
|
||
|
||
|
||
FRAME_ADDR
|
||
frame_chain (frame)
|
||
struct frame_info *frame;
|
||
{
|
||
int my_framesize, caller_framesize;
|
||
struct unwind_table_entry *u;
|
||
|
||
/* Get frame sizes for the current frame and the frame of the
|
||
caller. */
|
||
my_framesize = find_proc_framesize (frame->pc);
|
||
caller_framesize = find_proc_framesize (FRAME_SAVED_PC(frame));
|
||
|
||
/* If caller does not have a frame pointer, then its frame
|
||
can be found at current_frame - caller_framesize. */
|
||
if (caller_framesize != -1)
|
||
return frame->frame - caller_framesize;
|
||
|
||
/* Both caller and callee have frame pointers and are GCC compiled
|
||
(SAVE_SP bit in unwind descriptor is on for both functions.
|
||
The previous frame pointer is found at the top of the current frame. */
|
||
if (caller_framesize == -1 && my_framesize == -1)
|
||
return read_memory_integer (frame->frame, 4);
|
||
|
||
/* Caller has a frame pointer, but callee does not. This is a little
|
||
more difficult as GCC and HP C lay out locals and callee register save
|
||
areas very differently.
|
||
|
||
The previous frame pointer could be in a register, or in one of
|
||
several areas on the stack.
|
||
|
||
Walk from the current frame to the innermost frame examining
|
||
unwind descriptors to determine if %r4 ever gets saved into the
|
||
stack. If so return whatever value got saved into the stack.
|
||
If it was never saved in the stack, then the value in %r4 is still
|
||
valid, so use it.
|
||
|
||
We use information from unwind descriptors to determine if %r4
|
||
is saved into the stack (Entry_GR field has this information). */
|
||
|
||
while (frame)
|
||
{
|
||
u = find_unwind_entry (frame->pc);
|
||
|
||
if (!u)
|
||
{
|
||
/* We could find this information by examining prologues. I don't
|
||
think anyone has actually written any tools (not even "strip")
|
||
which leave them out of an executable, so maybe this is a moot
|
||
point. */
|
||
warning ("Unable to find unwind for PC 0x%x -- Help!", frame->pc);
|
||
return 0;
|
||
}
|
||
|
||
/* Entry_GR specifies the number of callee-saved general registers
|
||
saved in the stack. It starts at %r3, so %r4 would be 2. */
|
||
if (u->Entry_GR >= 2 || u->Save_SP)
|
||
break;
|
||
else
|
||
frame = frame->next;
|
||
}
|
||
|
||
if (frame)
|
||
{
|
||
/* We may have walked down the chain into a function with a frame
|
||
pointer. */
|
||
if (u->Save_SP)
|
||
return read_memory_integer (frame->frame, 4);
|
||
/* %r4 was saved somewhere in the stack. Dig it out. */
|
||
else
|
||
return dig_fp_from_stack (frame, u);
|
||
}
|
||
else
|
||
{
|
||
/* The value in %r4 was never saved into the stack (thus %r4 still
|
||
holds the value of the previous frame pointer). */
|
||
return read_register (4);
|
||
}
|
||
}
|
||
|
||
/* Given a frame and an unwind descriptor return the value for %fr (aka fp)
|
||
which was saved into the stack. FIXME: Why can't we just use the standard
|
||
saved_regs stuff? */
|
||
|
||
static FRAME_ADDR
|
||
dig_fp_from_stack (frame, u)
|
||
FRAME frame;
|
||
struct unwind_table_entry *u;
|
||
{
|
||
CORE_ADDR pc = u->region_start;
|
||
|
||
/* Search the function for the save of %r4. */
|
||
while (pc != u->region_end)
|
||
{
|
||
char buf[4];
|
||
unsigned long inst;
|
||
int status;
|
||
|
||
/* We need only look for the standard stw %r4,X(%sp) instruction,
|
||
the other variants (eg stwm) are only used on the first register
|
||
save (eg %r3). */
|
||
status = target_read_memory (pc, buf, 4);
|
||
inst = extract_unsigned_integer (buf, 4);
|
||
|
||
if (status != 0)
|
||
memory_error (status, pc);
|
||
|
||
/* Check for stw %r4,X(%sp). */
|
||
if ((inst & 0xffffc000) == 0x6bc40000)
|
||
{
|
||
/* Found the instruction which saves %r4. The offset (relative
|
||
to this frame) is framesize + immed14 (derived from the
|
||
store instruction). */
|
||
int offset = (u->Total_frame_size << 3) + extract_14 (inst);
|
||
|
||
return read_memory_integer (frame->frame + offset, 4);
|
||
}
|
||
|
||
/* Keep looking. */
|
||
pc += 4;
|
||
}
|
||
|
||
warning ("Unable to find %%r4 in stack.\n");
|
||
return 0;
|
||
}
|
||
|
||
|
||
/* 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;
|
||
{
|
||
struct minimal_symbol *msym_us;
|
||
struct minimal_symbol *msym_start;
|
||
struct unwind_table_entry *u;
|
||
|
||
if (!chain)
|
||
return 0;
|
||
|
||
u = find_unwind_entry (thisframe->pc);
|
||
|
||
/* We can't just check that the same of msym_us is "_start", because
|
||
someone idiotically decided that they were going to make a Ltext_end
|
||
symbol with the same address. This Ltext_end symbol is totally
|
||
indistinguishable (as nearly as I can tell) from the symbol for a function
|
||
which is (legitimately, since it is in the user's namespace)
|
||
named Ltext_end, so we can't just ignore it. */
|
||
msym_us = lookup_minimal_symbol_by_pc (FRAME_SAVED_PC (thisframe));
|
||
msym_start = lookup_minimal_symbol ("_start", NULL);
|
||
if (msym_us
|
||
&& msym_start
|
||
&& SYMBOL_VALUE_ADDRESS (msym_us) == SYMBOL_VALUE_ADDRESS (msym_start))
|
||
return 0;
|
||
|
||
if (u == NULL)
|
||
return 1;
|
||
|
||
if (u->Save_SP || u->Total_frame_size)
|
||
return 1;
|
||
|
||
if (pc_in_linker_stub (thisframe->pc))
|
||
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;
|
||
register int regnum;
|
||
int int_buffer;
|
||
double freg_buffer;
|
||
|
||
/* Space for "arguments"; the RP goes in here. */
|
||
sp = read_register (SP_REGNUM) + 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;
|
||
|
||
for (fp += 12, i = 3; i < 32; i++)
|
||
{
|
||
if (i != FP_REGNUM)
|
||
{
|
||
frame_saved_regs->regs[i] = fp;
|
||
fp += 4;
|
||
}
|
||
}
|
||
|
||
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;
|
||
frame_saved_regs->regs[SAR_REGNUM] = fp + 4;
|
||
frame_saved_regs->regs[PCOQ_HEAD_REGNUM] = fp + 8;
|
||
frame_saved_regs->regs[PCSQ_HEAD_REGNUM] = fp + 12;
|
||
frame_saved_regs->regs[PCOQ_TAIL_REGNUM] = fp + 16;
|
||
frame_saved_regs->regs[PCSQ_TAIL_REGNUM] = fp + 20;
|
||
}
|
||
|
||
int
|
||
hppa_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 */
|
||
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 the PC was explicitly saved, then just restore it. */
|
||
if (fsr.regs[PCOQ_TAIL_REGNUM])
|
||
write_register (PCOQ_TAIL_REGNUM,
|
||
read_memory_integer (fsr.regs[PCOQ_TAIL_REGNUM], 4));
|
||
|
||
/* Else use the value in %rp to set the new PC. */
|
||
else
|
||
target_write_pc (read_register (RP_REGNUM));
|
||
|
||
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. */
|
||
|
||
static int
|
||
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. */
|
||
write_register (PCOQ_HEAD_REGNUM, pc + 4);
|
||
write_register (PCOQ_TAIL_REGNUM, pc + 8);
|
||
|
||
/*
|
||
* 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++)
|
||
{
|
||
/* FIXME: What if the inferior gets a signal right now? Want to
|
||
merge this into wait_for_inferior (as a special kind of
|
||
watchpoint? By setting a breakpoint at the end? Is there
|
||
any other choice? Is there *any* way to do this stuff with
|
||
ptrace() or some equivalent?). */
|
||
resume (1, 0);
|
||
target_wait(inferior_pid, &w);
|
||
|
||
if (!WIFSTOPPED (w))
|
||
{
|
||
stop_signal = WTERMSIG (w);
|
||
terminal_ours_for_output ();
|
||
printf_unfiltered ("\nProgram terminated with signal %d, %s\n",
|
||
stop_signal, safe_strsignal (stop_signal));
|
||
gdb_flush (gdb_stdout);
|
||
return 0;
|
||
}
|
||
}
|
||
target_terminal_ours ();
|
||
fetch_inferior_registers (-1);
|
||
return 1;
|
||
}
|
||
|
||
CORE_ADDR
|
||
hppa_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 * sizeof (int));
|
||
int cum = 0;
|
||
int i, alignment;
|
||
|
||
for (i = 0; i < nargs; i++)
|
||
{
|
||
/* Coerce chars to int & float to double if necessary */
|
||
args[i] = value_arg_coerce (args[i]);
|
||
|
||
cum += TYPE_LENGTH (VALUE_TYPE (args[i]));
|
||
|
||
/* value must go at proper alignment. Assume alignment is a
|
||
power of two.*/
|
||
alignment = hppa_alignof (VALUE_TYPE (args[i]));
|
||
if (cum % alignment)
|
||
cum = (cum + alignment) & -alignment;
|
||
offset[i] = -cum;
|
||
}
|
||
sp += max ((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;
|
||
}
|
||
|
||
/*
|
||
* Insert the specified number of args and function address
|
||
* into a call sequence of the above form stored at DUMMYNAME.
|
||
*
|
||
* On the hppa we need to call the stack dummy through $$dyncall.
|
||
* Therefore our version of FIX_CALL_DUMMY takes an extra argument,
|
||
* real_pc, which is the location where gdb should start up the
|
||
* inferior to do the function call.
|
||
*/
|
||
|
||
CORE_ADDR
|
||
hppa_fix_call_dummy (dummy, pc, fun, nargs, args, type, gcc_p)
|
||
REGISTER_TYPE *dummy;
|
||
CORE_ADDR pc;
|
||
CORE_ADDR fun;
|
||
int nargs;
|
||
value *args;
|
||
struct type *type;
|
||
int gcc_p;
|
||
{
|
||
CORE_ADDR dyncall_addr, sr4export_addr;
|
||
struct minimal_symbol *msymbol;
|
||
int flags = read_register (FLAGS_REGNUM);
|
||
|
||
msymbol = lookup_minimal_symbol ("$$dyncall", (struct objfile *) NULL);
|
||
if (msymbol == NULL)
|
||
error ("Can't find an address for $$dyncall trampoline");
|
||
|
||
dyncall_addr = SYMBOL_VALUE_ADDRESS (msymbol);
|
||
|
||
msymbol = lookup_minimal_symbol ("_sr4export", (struct objfile *) NULL);
|
||
if (msymbol == NULL)
|
||
error ("Can't find an address for _sr4export trampoline");
|
||
|
||
sr4export_addr = SYMBOL_VALUE_ADDRESS (msymbol);
|
||
|
||
dummy[9] = deposit_21 (fun >> 11, dummy[9]);
|
||
dummy[10] = deposit_14 (fun & MASK_11, dummy[10]);
|
||
dummy[12] = deposit_21 (sr4export_addr >> 11, dummy[12]);
|
||
dummy[13] = deposit_14 (sr4export_addr & MASK_11, dummy[13]);
|
||
|
||
write_register (22, pc);
|
||
|
||
/* If we are in a syscall, then we should call the stack dummy
|
||
directly. $$dyncall is not needed as the kernel sets up the
|
||
space id registers properly based on the value in %r31. In
|
||
fact calling $$dyncall will not work because the value in %r22
|
||
will be clobbered on the syscall exit path. */
|
||
if (flags & 2)
|
||
return pc;
|
||
else
|
||
return dyncall_addr;
|
||
|
||
}
|
||
|
||
/* Get the PC from %r31 if currently in a syscall. Also mask out privilege
|
||
bits. */
|
||
CORE_ADDR
|
||
target_read_pc ()
|
||
{
|
||
int flags = read_register (FLAGS_REGNUM);
|
||
|
||
if (flags & 2)
|
||
return read_register (31) & ~0x3;
|
||
return read_register (PC_REGNUM) & ~0x3;
|
||
}
|
||
|
||
/* Write out the PC. If currently in a syscall, then also write the new
|
||
PC value into %r31. */
|
||
void
|
||
target_write_pc (v)
|
||
CORE_ADDR v;
|
||
{
|
||
int flags = read_register (FLAGS_REGNUM);
|
||
|
||
/* If in a syscall, then set %r31. Also make sure to get the
|
||
privilege bits set correctly. */
|
||
if (flags & 2)
|
||
write_register (31, (long) (v | 0x3));
|
||
|
||
write_register (PC_REGNUM, (long) v);
|
||
write_register (NPC_REGNUM, (long) v + 4);
|
||
}
|
||
|
||
/* return the alignment of a type in bytes. Structures have the maximum
|
||
alignment required by their fields. */
|
||
|
||
static int
|
||
hppa_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 hppa_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 = hppa_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_unfiltered ("%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_unfiltered ("%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. */
|
||
read_relative_register_raw_bytes (i, raw_buffer);
|
||
|
||
/* Convert raw data to virtual format if necessary. */
|
||
#ifdef REGISTER_CONVERTIBLE
|
||
if (REGISTER_CONVERTIBLE (i))
|
||
{
|
||
REGISTER_CONVERT_TO_VIRTUAL (i, REGISTER_VIRTUAL_TYPE (i),
|
||
raw_buffer, virtual_buffer);
|
||
}
|
||
else
|
||
#endif
|
||
memcpy (virtual_buffer, raw_buffer,
|
||
REGISTER_VIRTUAL_SIZE (i));
|
||
|
||
fputs_filtered (reg_names[i], gdb_stdout);
|
||
print_spaces_filtered (15 - strlen (reg_names[i]), gdb_stdout);
|
||
|
||
val_print (REGISTER_VIRTUAL_TYPE (i), virtual_buffer, 0, gdb_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.
|
||
|
||
For computed calls, we just extract the new PC from r22. */
|
||
|
||
CORE_ADDR
|
||
skip_trampoline_code (pc, name)
|
||
CORE_ADDR pc;
|
||
char *name;
|
||
{
|
||
long inst0, inst1;
|
||
static CORE_ADDR dyncall = 0;
|
||
struct minimal_symbol *msym;
|
||
|
||
/* FIXME XXX - dyncall must be initialized whenever we get a new exec file */
|
||
|
||
if (!dyncall)
|
||
{
|
||
msym = lookup_minimal_symbol ("$$dyncall", NULL);
|
||
if (msym)
|
||
dyncall = SYMBOL_VALUE_ADDRESS (msym);
|
||
else
|
||
dyncall = -1;
|
||
}
|
||
|
||
if (pc == dyncall)
|
||
return (CORE_ADDR)(read_register (22) & ~0x3);
|
||
|
||
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 = (CORE_ADDR)NULL;
|
||
|
||
return pc;
|
||
}
|
||
|
||
/* Advance PC across any function entry prologue instructions
|
||
to reach some "real" code. */
|
||
|
||
/* skip (stw rp, -20(0,sp)); copy 4,1; copy sp, 4; stwm 1,framesize(sp)
|
||
for gcc, or (stw rp, -20(0,sp); stwm 1, framesize(sp) for hcc */
|
||
|
||
CORE_ADDR
|
||
skip_prologue(pc)
|
||
CORE_ADDR pc;
|
||
{
|
||
char buf[4];
|
||
unsigned long inst;
|
||
int status;
|
||
|
||
status = target_read_memory (pc, buf, 4);
|
||
inst = extract_unsigned_integer (buf, 4);
|
||
if (status != 0)
|
||
return pc;
|
||
|
||
if (inst == 0x6BC23FD9) /* stw rp,-20(sp) */
|
||
{
|
||
if (read_memory_integer (pc + 4, 4) == 0x8040241) /* copy r4,r1 */
|
||
pc += 16;
|
||
else if ((read_memory_integer (pc + 4, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */
|
||
pc += 8;
|
||
}
|
||
else if (read_memory_integer (pc, 4) == 0x8040241) /* copy r4,r1 */
|
||
pc += 12;
|
||
else if ((read_memory_integer (pc, 4) & ~MASK_14) == 0x68810000) /* stw r1,(r4) */
|
||
pc += 4;
|
||
|
||
return pc;
|
||
}
|
||
|
||
#ifdef MAINTENANCE_CMDS
|
||
|
||
static void
|
||
unwind_command (exp, from_tty)
|
||
char *exp;
|
||
int from_tty;
|
||
{
|
||
CORE_ADDR address;
|
||
union
|
||
{
|
||
int *foo;
|
||
struct unwind_table_entry *u;
|
||
} xxx;
|
||
|
||
/* If we have an expression, evaluate it and use it as the address. */
|
||
|
||
if (exp != 0 && *exp != 0)
|
||
address = parse_and_eval_address (exp);
|
||
else
|
||
return;
|
||
|
||
xxx.u = find_unwind_entry (address);
|
||
|
||
if (!xxx.u)
|
||
{
|
||
printf_unfiltered ("Can't find unwind table entry for PC 0x%x\n", address);
|
||
return;
|
||
}
|
||
|
||
printf_unfiltered ("%08x\n%08X\n%08X\n%08X\n", xxx.foo[0], xxx.foo[1], xxx.foo[2],
|
||
xxx.foo[3]);
|
||
}
|
||
#endif /* MAINTENANCE_CMDS */
|
||
|
||
void
|
||
_initialize_hppa_tdep ()
|
||
{
|
||
#ifdef MAINTENANCE_CMDS
|
||
add_cmd ("unwind", class_maintenance, unwind_command,
|
||
"Print unwind table entry at given address.",
|
||
&maintenanceprintlist);
|
||
#endif /* MAINTENANCE_CMDS */
|
||
}
|