393 lines
11 KiB
C
393 lines
11 KiB
C
/* Host-dependent code for GDB, for NYU Ultra3 running Sym1 OS.
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Copyright (C) 1988, 1989, 1991 Free Software Foundation, Inc.
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Contributed by David Wood (wood@nyu.edu) at New York University.
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This file is part of GDB.
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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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#define DEBUG
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#include <stdio.h>
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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 "symtab.h"
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#include "value.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <signal.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include "gdbcore.h"
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/ptrace.h>
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/* Assumes support for AMD's Binary Compatibility Standard
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for ptrace(). If you define ULTRA3, the ultra3 extensions to
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ptrace() are used allowing the reading of more than one register
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at a time.
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This file assumes KERNEL_DEBUGGING is turned off. This means
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that if the user/gdb tries to read gr64-gr95 or any of the
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protected special registers we silently return -1 (see the
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CANNOT_STORE/FETCH_REGISTER macros). */
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#define ULTRA3
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#if !defined (offsetof)
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# define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
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#endif
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extern int errno;
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struct ptrace_user pt_struct;
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/*
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* Fetch an individual register (and supply it).
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* return 0 on success, -1 on failure.
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* NOTE: Assumes AMD's Binary Compatibility Standard for ptrace().
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*/
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static void
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fetch_register (regno)
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int regno;
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{
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char buf[128];
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int val;
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if (CANNOT_FETCH_REGISTER(regno)) {
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val = -1;
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supply_register (regno, &val);
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} else {
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errno = 0;
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val = ptrace (PT_READ_U, inferior_pid, (int*)register_addr(regno,0), 0);
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if (errno != 0) {
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sprintf(buf,"reading register %s (#%d)",reg_names[regno],regno);
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perror_with_name (buf);
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} else {
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supply_register (regno, &val);
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}
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}
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}
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/* Get all available registers from the inferior. Registers that are
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* defined in REGISTER_NAMES, but not available to the user/gdb are
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* supplied as -1. This may include gr64-gr95 and the protected special
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* purpose registers.
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*/
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void
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fetch_inferior_registers (regno)
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int regno;
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{
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register int i,j,ret_val=0;
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char buf[128];
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if (regno != -1) {
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fetch_register (regno);
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return;
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}
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/* Global Registers */
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#ifdef ULTRA3
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errno = 0;
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ptrace (PT_READ_STRUCT, inferior_pid, (int*)register_addr(GR96_REGNUM,0),
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(int)&pt_struct.pt_gr[0], 32*4);
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if (errno != 0) {
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perror_with_name ("reading global registers");
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ret_val = -1;
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} else for (regno=GR96_REGNUM, j=0 ; j<32 ; regno++, j++) {
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supply_register (regno, &pt_struct.pt_gr[j]);
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}
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#else
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for (regno=GR96_REGNUM ; !ret_val && regno < GR96_REGNUM+32 ; regno++)
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fetch_register(regno);
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#endif
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/* Local Registers */
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#ifdef ULTRA3
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errno = 0;
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ptrace (PT_READ_STRUCT, inferior_pid, (int*)register_addr(LR0_REGNUM,0),
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(int)&pt_struct.pt_lr[0], 128*4);
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if (errno != 0) {
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perror_with_name ("reading local registers");
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ret_val = -1;
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} else for (regno=LR0_REGNUM, j=0 ; j<128 ; regno++, j++) {
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supply_register (regno, &pt_struct.pt_lr[j]);
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}
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#else
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for (regno=LR0_REGNUM ; !ret_val && regno < LR0_REGNUM+128 ; regno++)
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fetch_register(regno);
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#endif
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/* Special Registers */
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fetch_register(GR1_REGNUM);
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fetch_register(CPS_REGNUM);
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fetch_register(PC_REGNUM);
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fetch_register(NPC_REGNUM);
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fetch_register(PC2_REGNUM);
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fetch_register(IPC_REGNUM);
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fetch_register(IPA_REGNUM);
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fetch_register(IPB_REGNUM);
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fetch_register(Q_REGNUM);
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fetch_register(BP_REGNUM);
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fetch_register(FC_REGNUM);
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/* Fake any registers that are in REGISTER_NAMES, but not available to gdb */
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registers_fetched();
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}
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/* Store our register values back into the inferior.
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* If REGNO is -1, do this for all registers.
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* Otherwise, REGNO specifies which register (so we can save time).
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* NOTE: Assumes AMD's binary compatibility standard.
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*/
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int
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store_inferior_registers (regno)
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int regno;
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{
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register unsigned int regaddr;
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char buf[80];
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if (regno >= 0)
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{
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if (CANNOT_STORE_REGISTER(regno))
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return 0; /* Pretend success */
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regaddr = register_addr (regno, 0);
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errno = 0;
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ptrace (PT_WRITE_U, inferior_pid,(int*)regaddr,read_register(regno));
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if (errno != 0)
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{
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sprintf (buf, "writing register %s (#%d)", reg_names[regno],regno);
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perror_with_name (buf);
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}
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}
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else
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{
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#ifdef ULTRA3
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pt_struct.pt_gr1 = read_register(GR1_REGNUM);
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for (regno = GR96_REGNUM; regno < GR96_REGNUM+32; regno++)
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pt_struct.pt_gr[regno] = read_register(regno);
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for (regno = LR0_REGNUM; regno < LR0_REGNUM+128; regno++)
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pt_struct.pt_gr[regno] = read_register(regno);
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errno = 0;
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ptrace (PT_WRITE_STRUCT, inferior_pid, (int*)register_addr(GR1_REGNUM,0),
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(int)&pt_struct.pt_gr1,(1*32*128)*4);
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if (errno != 0)
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{
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sprintf (buf, "writing all local/global registers");
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perror_with_name (buf);
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}
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pt_struct.pt_psr = read_register(CPS_REGNUM);
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pt_struct.pt_pc0 = read_register(NPC_REGNUM);
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pt_struct.pt_pc1 = read_register(PC_REGNUM);
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pt_struct.pt_pc2 = read_register(PC2_REGNUM);
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pt_struct.pt_ipc = read_register(IPC_REGNUM);
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pt_struct.pt_ipa = read_register(IPA_REGNUM);
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pt_struct.pt_ipb = read_register(IPB_REGNUM);
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pt_struct.pt_q = read_register(Q_REGNUM);
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pt_struct.pt_bp = read_register(BP_REGNUM);
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pt_struct.pt_fc = read_register(FC_REGNUM);
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errno = 0;
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ptrace (PT_WRITE_STRUCT, inferior_pid, (int*)register_addr(CPS_REGNUM,0),
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(int)&pt_struct.pt_psr,(10)*4);
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if (errno != 0)
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{
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sprintf (buf, "writing all special registers");
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perror_with_name (buf);
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return -1;
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}
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#else
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store_inferior_registers(GR1_REGNUM);
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for (regno=GR96_REGNUM ; regno<GR96_REGNUM+32 ; regno++)
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store_inferior_registers(regno);
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for (regno=LR0_REGNUM ; regno<LR0_REGNUM+128 ; regno++)
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store_inferior_registers(regno);
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store_inferior_registers(CPS_REGNUM);
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store_inferior_registers(PC_REGNUM);
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store_inferior_registers(NPC_REGNUM);
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store_inferior_registers(PC2_REGNUM);
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store_inferior_registers(IPC_REGNUM);
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store_inferior_registers(IPA_REGNUM);
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store_inferior_registers(IPB_REGNUM);
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store_inferior_registers(Q_REGNUM);
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store_inferior_registers(BP_REGNUM);
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store_inferior_registers(FC_REGNUM);
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#endif /* ULTRA3 */
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}
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return 0;
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}
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/*
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* Read AMD's Binary Compatibilty Standard conforming core file.
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* struct ptrace_user is the first thing in the core file
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*/
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void
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fetch_core_registers ()
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{
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register int regno;
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int val;
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char buf[4];
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for (regno = 0 ; regno < NUM_REGS; regno++) {
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if (!CANNOT_FETCH_REGISTER(regno)) {
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val = bfd_seek (core_bfd, register_addr (regno, 0), 0);
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if (val < 0 || (val = bfd_read (buf, sizeof buf, 1, core_bfd)) < 0) {
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char * buffer = (char *) alloca (strlen (reg_names[regno]) + 35);
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strcpy (buffer, "Reading core register ");
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strcat (buffer, reg_names[regno]);
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perror_with_name (buffer);
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}
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supply_register (regno, buf);
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}
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}
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/* Fake any registers that are in REGISTER_NAMES, but not available to gdb */
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registers_fetched();
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}
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/*
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* Takes a register number as defined in tm.h via REGISTER_NAMES, and maps
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* it to an offset in a struct ptrace_user defined by AMD's BCS.
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* That is, it defines the mapping between gdb register numbers and items in
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* a struct ptrace_user.
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* A register protection scheme is set up here. If a register not
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* available to the user is specified in 'regno', then an address that
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* will cause ptrace() to fail is returned.
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*/
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unsigned int
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register_addr (regno,blockend)
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unsigned int regno;
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char *blockend;
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{
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if ((regno >= LR0_REGNUM) && (regno < LR0_REGNUM + 128)) {
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return(offsetof(struct ptrace_user,pt_lr[regno-LR0_REGNUM]));
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} else if ((regno >= GR96_REGNUM) && (regno < GR96_REGNUM + 32)) {
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return(offsetof(struct ptrace_user,pt_gr[regno-GR96_REGNUM]));
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} else {
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switch (regno) {
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case GR1_REGNUM: return(offsetof(struct ptrace_user,pt_gr1));
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case CPS_REGNUM: return(offsetof(struct ptrace_user,pt_psr));
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case NPC_REGNUM: return(offsetof(struct ptrace_user,pt_pc0));
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case PC_REGNUM: return(offsetof(struct ptrace_user,pt_pc1));
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case PC2_REGNUM: return(offsetof(struct ptrace_user,pt_pc2));
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case IPC_REGNUM: return(offsetof(struct ptrace_user,pt_ipc));
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case IPA_REGNUM: return(offsetof(struct ptrace_user,pt_ipa));
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case IPB_REGNUM: return(offsetof(struct ptrace_user,pt_ipb));
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case Q_REGNUM: return(offsetof(struct ptrace_user,pt_q));
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case BP_REGNUM: return(offsetof(struct ptrace_user,pt_bp));
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case FC_REGNUM: return(offsetof(struct ptrace_user,pt_fc));
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default:
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fprintf_filtered(stderr,"register_addr():Bad register %s (%d)\n",
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reg_names[regno],regno);
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return(0xffffffff); /* Should make ptrace() fail */
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}
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}
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}
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/* Assorted operating system circumventions */
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#ifdef SYM1
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/* FIXME: Kludge this for now. It really should be system call. */
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int
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getpagesize()
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{ return(8192); }
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/* FIXME: Fake out the fcntl() call, which we don't have. */
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fcntl(fd, cmd, arg)
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int fd, cmd, arg;
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{
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switch (cmd) {
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case F_GETFL: return(O_RDONLY); break;
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default:
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printf("Ultra3's fcntl() failing, cmd = %d.\n",cmd);
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return(-1);
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}
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}
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/*
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* 4.2 Signal support, requires linking with libjobs.
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*/
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static int _SigMask;
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#define sigbit(s) (1L << ((s)-1))
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init_SigMask()
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{
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/* Taken from the sym1 kernel in machdep.c:startup() */
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_SigMask = sigbit (SIGTSTP) | sigbit (SIGTTOU) | sigbit (SIGTTIN) |
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sigbit (SIGCHLD) | sigbit (SIGTINT);
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}
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sigmask(signo)
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int signo;
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{
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return (1 << (signo-1));
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}
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sigsetmask(sigmask)
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unsigned int sigmask;
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{
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int i, mask = 1;
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int lastmask = _SigMask;
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for (i=0 ; i<NSIG ; i++) {
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if (sigmask & mask) {
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if (!(_SigMask & mask)) {
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sighold(i+1);
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_SigMask |= mask;
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}
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} else if (_SigMask & mask) {
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sigrelse(i+1);
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_SigMask &= ~mask;
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}
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mask <<= 1;
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}
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return (lastmask);
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}
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sigblock(sigmask)
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unsigned int sigmask;
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{
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int i, mask = 1;
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int lastmask = _SigMask;
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for (i=0 ; i<NSIG ; i++) {
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if ((sigmask & mask) && !(_SigMask & mask)) {
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sighold(i+1);
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_SigMask |= mask;
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}
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mask <<= 1;
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}
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return (lastmask);
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}
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#endif /* SYM1 */
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/* Initialization code for this module. */
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_initialize_ultra3 ()
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{
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#ifdef SYM1
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init_SigMask();
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#endif
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}
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