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310 lines
8.3 KiB
C
310 lines
8.3 KiB
C
/* Machine-dependent hooks for the unix child process stratum, for HPUX PA-RISC.
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Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993
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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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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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#include "defs.h"
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#include "inferior.h"
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#include "target.h"
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#include <sys/ptrace.h>
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extern CORE_ADDR text_end;
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static void fetch_register ();
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/* This function simply calls ptrace with the given arguments.
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It exists so that all calls to ptrace are isolated in this
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machine-dependent file. */
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int
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call_ptrace (request, pid, addr, data)
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int request, pid;
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PTRACE_ARG3_TYPE addr;
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int data;
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{
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return ptrace (request, pid, addr, data, 0);
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}
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void
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kill_inferior ()
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{
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if (inferior_pid == 0)
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return;
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ptrace (PT_EXIT, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0, 0);
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wait ((int *)0);
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target_mourn_inferior ();
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}
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/* Start debugging the process whose number is PID. */
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int
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attach (pid)
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int pid;
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{
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errno = 0;
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ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0, 0);
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if (errno)
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perror_with_name ("ptrace");
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attach_flag = 1;
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return pid;
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}
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/* Stop debugging the process whose number is PID
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and continue it with signal number SIGNAL.
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SIGNAL = 0 means just continue it. */
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void
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detach (signal)
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int signal;
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{
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errno = 0;
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ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal, 0);
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if (errno)
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perror_with_name ("ptrace");
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attach_flag = 0;
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}
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/* Fetch all registers, or just one, from the child process. */
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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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if (regno == -1)
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for (regno = 0; regno < NUM_REGS; regno++)
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fetch_register (regno);
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else
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fetch_register (regno);
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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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void
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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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extern char registers[];
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register int i;
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unsigned int offset = U_REGS_OFFSET;
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int scratch;
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if (regno >= 0)
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{
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regaddr = register_addr (regno, offset);
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errno = 0;
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if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM)
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{
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scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3;
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ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
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scratch, 0);
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if (errno != 0)
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{
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/* Error, even if attached. Failing to write these two
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registers is pretty serious. */
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sprintf (buf, "writing register number %d", 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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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
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{
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errno = 0;
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ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
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*(int *) ®isters[REGISTER_BYTE (regno) + i], 0);
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if (errno != 0)
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{
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/* Warning, not error, in case we are attached; sometimes the
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kernel doesn't let us at the registers. */
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char *err = safe_strerror (errno);
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char *msg = alloca (strlen (err) + 128);
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sprintf (msg, "writing register %s: %s",
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reg_names[regno], err);
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warning (msg);
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goto error_exit;
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}
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regaddr += sizeof(int);
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}
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}
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else
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{
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for (regno = 0; regno < NUM_REGS; regno++)
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{
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if (CANNOT_STORE_REGISTER (regno))
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continue;
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store_inferior_registers (regno);
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}
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}
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error_exit:
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return;
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}
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/* Fetch one register. */
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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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register unsigned int regaddr;
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char buf[MAX_REGISTER_RAW_SIZE];
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char mess[128]; /* For messages */
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register int i;
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/* Offset of registers within the u area. */
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unsigned int offset;
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offset = U_REGS_OFFSET;
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regaddr = register_addr (regno, offset);
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for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
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{
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errno = 0;
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*(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid,
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(PTRACE_ARG3_TYPE) regaddr, 0, 0);
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regaddr += sizeof (int);
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if (errno != 0)
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{
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/* Warning, not error, in case we are attached; sometimes the
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kernel doesn't let us at the registers. */
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char *err = safe_strerror (errno);
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char *msg = alloca (strlen (err) + 128);
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sprintf (msg, "reading register %s: %s", reg_names[regno], err);
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warning (msg);
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goto error_exit;
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}
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}
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if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM)
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buf[3] &= ~0x3;
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supply_register (regno, buf);
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error_exit:;
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}
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/* Resume execution of process PID.
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If STEP is nonzero, single-step it.
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If SIGNAL is nonzero, give it that signal. */
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void
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child_resume (pid, step, signal)
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int pid;
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int step;
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int signal;
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{
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errno = 0;
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/* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where
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it was. (If GDB wanted it to start some other way, we have already
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written a new PC value to the child.) */
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if (step)
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ptrace (PT_SINGLE, pid, (PTRACE_ARG3_TYPE) 1, signal, 0);
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else
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ptrace (PT_CONTIN, pid, (PTRACE_ARG3_TYPE) 1, signal, 0);
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if (errno)
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perror_with_name ("ptrace");
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}
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/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
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to debugger memory starting at MYADDR. Copy to inferior if
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WRITE is nonzero.
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Returns the length copied, which is either the LEN argument or zero.
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This xfer function does not do partial moves, since child_ops
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doesn't allow memory operations to cross below us in the target stack
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anyway. */
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int
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child_xfer_memory (memaddr, myaddr, len, write, target)
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CORE_ADDR memaddr;
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char *myaddr;
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int len;
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int write;
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struct target_ops *target; /* ignored */
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{
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register int i;
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/* Round starting address down to longword boundary. */
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register CORE_ADDR addr = memaddr & - sizeof (int);
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/* Round ending address up; get number of longwords that makes. */
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register int count
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= (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
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/* Allocate buffer of that many longwords. */
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register int *buffer = (int *) alloca (count * sizeof (int));
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if (write)
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{
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/* Fill start and end extra bytes of buffer with existing memory data. */
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if (addr != memaddr || len < (int)sizeof (int)) {
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/* Need part of initial word -- fetch it. */
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buffer[0] = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER,
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inferior_pid, (PTRACE_ARG3_TYPE) addr, 0, 0);
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}
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if (count > 1) /* FIXME, avoid if even boundary */
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{
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buffer[count - 1]
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= ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, inferior_pid,
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(PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)),
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0, 0);
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}
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/* Copy data to be written over corresponding part of buffer */
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bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
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/* Write the entire buffer. */
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for (i = 0; i < count; i++, addr += sizeof (int))
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{
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/* The HP-UX kernel crashes if you use PT_WDUSER to write into the text
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segment. FIXME -- does it work to write into the data segment using
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WIUSER, or do these idiots really expect us to figure out which segment
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the address is in, so we can use a separate system call for it??! */
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errno = 0;
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ptrace (addr < text_end ? PT_WIUSER : PT_WDUSER, inferior_pid,
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(PTRACE_ARG3_TYPE) addr,
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buffer[i], 0);
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if (errno)
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return 0;
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}
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}
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else
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{
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/* Read all the longwords */
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for (i = 0; i < count; i++, addr += sizeof (int))
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{
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errno = 0;
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buffer[i] = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER,
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inferior_pid, (PTRACE_ARG3_TYPE) addr, 0, 0);
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if (errno)
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return 0;
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QUIT;
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}
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/* Copy appropriate bytes out of the buffer. */
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bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
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}
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return len;
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}
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