215 lines
6.1 KiB
C
215 lines
6.1 KiB
C
/* Machine-dependent hooks for the unix child process stratum. This
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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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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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/* Use an extra level of indirection for ptrace calls.
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This lets us breakpoint usefully on call_ptrace. It also
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allows us to pass an extra argument to ptrace without
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using an ANSI-C specific macro. */
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#define ptrace call_ptrace
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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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/* U_REGS_OFFSET is the offset of the registers within the u area. */
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#if !defined (U_REGS_OFFSET)
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#define U_REGS_OFFSET \
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ptrace (PT_READ_U, inferior_pid, \
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(PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
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- KERNEL_U_ADDR
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#endif
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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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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);
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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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supply_register (regno, buf);
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error_exit:;
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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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if (CANNOT_STORE_REGISTER (regno))
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return;
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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);
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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]);
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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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return;
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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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for (regno = 0; regno < NUM_REGS; regno++)
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store_inferior_registers (regno);
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}
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/* PT_PROT is specific to the PA BSD kernel and isn't documented
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anywhere (except here).
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PT_PROT allows one to enable/disable the data memory break bit
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for pages of memory in an inferior process. This bit is used
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to cause "Data memory break traps" to occur when the appropriate
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page is written to.
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The arguments are as follows:
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PT_PROT -- The ptrace action to perform.
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INFERIOR_PID -- The pid of the process who's page table entries
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will be modified.
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PT_ARGS -- The *address* of a 3 word block of memory which has
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additional information:
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word 0 -- The start address to watch. This should be a page-aligned
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address.
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word 1 -- The ending address to watch. Again, this should be a
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page aligned address.
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word 2 -- Nonzero to enable the data memory break bit on the
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given address range or zero to disable the data memory break
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bit on the given address range.
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This call may fail if the given addresses are not valid in the inferior
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process. This most often happens when restarting a program which
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as watchpoints inserted on heap or stack memory. */
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#define PT_PROT 21
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int
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hppa_set_watchpoint (addr, len, flag)
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int addr, len, flag;
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{
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int pt_args[3];
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pt_args[0] = addr;
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pt_args[1] = addr + len;
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pt_args[2] = flag;
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/* Mask off the lower 12 bits since we want to work on a page basis. */
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pt_args[0] >>= 12;
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pt_args[1] >>= 12;
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/* Rounding adjustments. */
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pt_args[1] -= pt_args[0];
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pt_args[1]++;
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/* Put the lower 12 bits back as zero. */
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pt_args[0] <<= 12;
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pt_args[1] <<= 12;
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/* Do it. */
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return ptrace (PT_PROT, inferior_pid, (PTRACE_ARG3_TYPE) pt_args, 0);
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}
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