old-cross-binutils/gdb/hppab-nat.c
Jim Kingdon 976bb0be03 * Makefile.in (init.c): Generate using the source, not munch. This
cleans up all kinds of hassles (which nm to use in munch, etc).  The
	new formatting conventions (mostly already followed) are that
	the name of the _initialize_* routines must start in column zero,
	and must not be inside #if.
	* munch: Removed.
	* Makefile.in: Remove references to munch.
	* serial.c, remote.c, infptrace.c, maint.c, convex-tdep.c,
	alpha-tdep.c, hp300ux-nat.c, hppab-nat.c, osfsolib.c, remote-es.c,
	procfs.c, remote-udi.c, ser-go32.c, ultra3-xdep.c, sh-tdep.c,
	i960-tdep.c, hppa-tdep.c, h8500-tdep.c, dpx2-nat.c, delta68-nat.c,
	z8k-tdep.c: Make sure the above conventions are followed.  Make
	sure they are all declared as returning void.  Clean up
	miscellaneous comments and such.
1993-10-22 05:55:58 +00:00

372 lines
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/* Machine-dependent hooks for the unix child process stratum. This
code is for the HP PA-RISC cpu.
Copyright 1986, 1987, 1989, 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
Contributed by the Center for Software Science at the
University of Utah (pa-gdb-bugs@cs.utah.edu).
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "inferior.h"
#include "target.h"
#include <sys/ptrace.h>
#ifndef PT_ATTACH
#define PT_ATTACH PTRACE_ATTACH
#endif
#ifndef PT_DETACH
#define PT_DETACH PTRACE_DETACH
#endif
/* This function simply calls ptrace with the given arguments.
It exists so that all calls to ptrace are isolated in this
machine-dependent file. */
int
call_ptrace (request, pid, addr, data)
int request, pid;
PTRACE_ARG3_TYPE addr;
int data;
{
return ptrace (request, pid, addr, data, 0);
}
/* Use an extra level of indirection for ptrace calls.
This lets us breakpoint usefully on call_ptrace. It also
allows us to pass an extra argument to ptrace without
using an ANSI-C specific macro. */
#define ptrace call_ptrace
void
kill_inferior ()
{
if (inferior_pid == 0)
return;
ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0);
wait ((int *)0);
target_mourn_inferior ();
}
#ifdef ATTACH_DETACH
/* Start debugging the process whose number is PID. */
int
attach (pid)
int pid;
{
errno = 0;
ptrace (PT_ATTACH, pid, (PTRACE_ARG3_TYPE) 0, 0);
if (errno)
perror_with_name ("ptrace");
attach_flag = 1;
return pid;
}
/* Stop debugging the process whose number is PID
and continue it with signal number SIGNAL.
SIGNAL = 0 means just continue it. */
void
detach (signal)
int signal;
{
errno = 0;
ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
if (errno)
perror_with_name ("ptrace");
attach_flag = 0;
}
#endif /* ATTACH_DETACH */
/* KERNEL_U_ADDR is the amount to subtract from u.u_ar0
to get the offset in the core file of the register values. */
#if defined (KERNEL_U_ADDR_BSD)
/* Get kernel_u_addr using BSD-style nlist(). */
CORE_ADDR kernel_u_addr;
#include <a.out.gnu.h> /* For struct nlist */
void
_initialize_kernel_u_addr ()
{
struct nlist names[2];
names[0].n_un.n_name = "_u";
names[1].n_un.n_name = NULL;
if (nlist ("/vmunix", names) == 0)
kernel_u_addr = names[0].n_value;
else
fatal ("Unable to get kernel u area address.");
}
#endif /* KERNEL_U_ADDR_BSD. */
#if defined (KERNEL_U_ADDR_HPUX)
/* Get kernel_u_addr using HPUX-style nlist(). */
CORE_ADDR kernel_u_addr;
struct hpnlist {
char * n_name;
long n_value;
unsigned char n_type;
unsigned char n_length;
short n_almod;
short n_unused;
};
static struct hpnlist nl[] = {{ "_u", -1, }, { (char *) 0, }};
/* read the value of the u area from the hp-ux kernel */
void
_initialize_kernel_u_addr ()
{
struct user u;
nlist ("/hp-ux", &nl);
kernel_u_addr = nl[0].n_value;
}
#endif /* KERNEL_U_ADDR_HPUX. */
#if !defined (offsetof)
#define offsetof(TYPE, MEMBER) ((unsigned long) &((TYPE *)0)->MEMBER)
#endif
/* U_REGS_OFFSET is the offset of the registers within the u area. */
#if !defined (U_REGS_OFFSET)
#define U_REGS_OFFSET \
ptrace (PT_READ_U, inferior_pid, \
(PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
- KERNEL_U_ADDR
#endif
/* Fetch one register. */
static void
fetch_register (regno)
int regno;
{
register unsigned int regaddr;
char buf[MAX_REGISTER_RAW_SIZE];
register int i;
/* Offset of registers within the u area. */
unsigned int offset;
offset = U_REGS_OFFSET;
regaddr = register_addr (regno, offset);
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (int))
{
errno = 0;
*(int *) &buf[i] = ptrace (PT_RUREGS, inferior_pid,
(PTRACE_ARG3_TYPE) regaddr, 0);
regaddr += sizeof (int);
if (errno != 0)
{
/* Warning, not error, in case we are attached; sometimes the
kernel doesn't let us at the registers. */
char *err = safe_strerror (errno);
char *msg = alloca (strlen (err) + 128);
sprintf (msg, "reading register %s: %s", reg_names[regno], err);
warning (msg);
goto error_exit;
}
}
supply_register (regno, buf);
error_exit:;
}
/* Fetch all registers, or just one, from the child process. */
void
fetch_inferior_registers (regno)
int regno;
{
if (regno == -1)
for (regno = 0; regno < NUM_REGS; regno++)
fetch_register (regno);
else
fetch_register (regno);
}
/* Store our register values back into the inferior.
If REGNO is -1, do this for all registers.
Otherwise, REGNO specifies which register (so we can save time). */
void
store_inferior_registers (regno)
int regno;
{
register unsigned int regaddr;
extern char registers[];
register int i;
unsigned int offset = U_REGS_OFFSET;
if (regno >= 0)
{
regaddr = register_addr (regno, offset);
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
{
errno = 0;
ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
*(int *) &registers[REGISTER_BYTE (regno) + i]);
if (errno != 0)
{
char *err = safe_strerror (errno);
char *msg = alloca (strlen (err) + 128);
sprintf (msg, "writing register %s: %s", reg_names[regno], err);
warning (msg);
}
regaddr += sizeof(int);
}
}
else
{
for (regno = 0; regno < NUM_REGS; regno++)
{
if (CANNOT_STORE_REGISTER (regno))
continue;
store_inferior_registers (regno);
}
}
return;
}
/* Resume execution of process PID.
If STEP is nonzero, single-step it.
If SIGNAL is nonzero, give it that signal. */
void
child_resume (pid, step, signal)
int pid;
int step;
int signal;
{
errno = 0;
if (pid == -1)
pid = inferior_pid;
/* An address of (PTRACE_ARG3_TYPE) 1 tells ptrace to continue from where
it was. (If GDB wanted it to start some other way, we have already
written a new PC value to the child.) */
if (step)
ptrace (PT_STEP, pid, (PTRACE_ARG3_TYPE) 1, signal);
else
ptrace (PT_CONTINUE, pid, (PTRACE_ARG3_TYPE) 1, signal);
if (errno)
perror_with_name ("ptrace");
}
/* NOTE! I tried using PTRACE_READDATA, etc., to read and write memory
in the NEW_SUN_PTRACE case.
It ought to be straightforward. But it appears that writing did
not write the data that I specified. I cannot understand where
it got the data that it actually did write. */
/* Copy LEN bytes to or from inferior's memory starting at MEMADDR
to debugger memory starting at MYADDR. Copy to inferior if
WRITE is nonzero.
Returns the length copied, which is either the LEN argument or zero.
This xfer function does not do partial moves, since child_ops
doesn't allow memory operations to cross below us in the target stack
anyway. */
int
child_xfer_memory (memaddr, myaddr, len, write, target)
CORE_ADDR memaddr;
char *myaddr;
int len;
int write;
struct target_ops *target; /* ignored */
{
register int i;
/* Round starting address down to longword boundary. */
register CORE_ADDR addr = memaddr & - sizeof (int);
/* Round ending address up; get number of longwords that makes. */
register int count
= (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int);
/* Allocate buffer of that many longwords. */
register int *buffer = (int *) alloca (count * sizeof (int));
if (write)
{
/* Fill start and end extra bytes of buffer with existing memory data. */
if (addr != memaddr || len < (int)sizeof (int)) {
/* Need part of initial word -- fetch it. */
buffer[0] = ptrace (PT_READ_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
0);
}
if (count > 1) /* FIXME, avoid if even boundary */
{
buffer[count - 1]
= ptrace (PT_READ_I, inferior_pid,
(PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)),
0);
}
/* Copy data to be written over corresponding part of buffer */
memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len);
/* Write the entire buffer. */
for (i = 0; i < count; i++, addr += sizeof (int))
{
errno = 0;
ptrace (PT_WRITE_D, inferior_pid, (PTRACE_ARG3_TYPE) addr,
buffer[i]);
if (errno)
{
/* Using the appropriate one (I or D) is necessary for
Gould NP1, at least. */
errno = 0;
ptrace (PT_WRITE_I, inferior_pid, (PTRACE_ARG3_TYPE) addr,
buffer[i]);
}
if (errno)
return 0;
}
}
else
{
/* Read all the longwords */
for (i = 0; i < count; i++, addr += sizeof (int))
{
errno = 0;
buffer[i] = ptrace (PT_READ_I, inferior_pid,
(PTRACE_ARG3_TYPE) addr, 0);
if (errno)
return 0;
QUIT;
}
/* Copy appropriate bytes out of the buffer. */
memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
}
return len;
}