a15f6b0a8e
CANNOT_STORE_REGISTER to a better place. Fixes ptrace I/O errors found by test suite during function calls, which attempts to write unwritable registers.
227 lines
6.6 KiB
C
227 lines
6.6 KiB
C
/* Machine-dependent hooks for the unix child process stratum, for HPUX PA-RISC.
|
|
|
|
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>
|
|
|
|
extern CORE_ADDR text_end;
|
|
|
|
static void fetch_register ();
|
|
|
|
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;
|
|
char buf[80];
|
|
extern char registers[];
|
|
register int i;
|
|
unsigned int offset = U_REGS_OFFSET;
|
|
int scratch;
|
|
|
|
if (regno >= 0)
|
|
{
|
|
if (CANNOT_STORE_REGISTER (regno))
|
|
return;
|
|
regaddr = register_addr (regno, offset);
|
|
errno = 0;
|
|
if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM)
|
|
{
|
|
scratch = *(int *) ®isters[REGISTER_BYTE (regno)] | 0x3;
|
|
ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
|
|
scratch, 0);
|
|
if (errno != 0)
|
|
{
|
|
/* Error, even if attached. Failing to write these two
|
|
registers is pretty serious. */
|
|
sprintf (buf, "writing register number %d", regno);
|
|
perror_with_name (buf);
|
|
}
|
|
}
|
|
else
|
|
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof(int))
|
|
{
|
|
errno = 0;
|
|
ptrace (PT_WUREGS, inferior_pid, (PTRACE_ARG3_TYPE) regaddr,
|
|
*(int *) ®isters[REGISTER_BYTE (regno) + i], 0);
|
|
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, "writing register %s: %s",
|
|
reg_names[regno], err);
|
|
warning (msg);
|
|
return;
|
|
}
|
|
regaddr += sizeof(int);
|
|
}
|
|
}
|
|
else
|
|
for (regno = 0; regno < NUM_REGS; regno++)
|
|
store_inferior_registers (regno);
|
|
}
|
|
|
|
/* Fetch one register. */
|
|
|
|
static void
|
|
fetch_register (regno)
|
|
int regno;
|
|
{
|
|
register unsigned int regaddr;
|
|
char buf[MAX_REGISTER_RAW_SIZE];
|
|
char mess[128]; /* For messages */
|
|
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, 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;
|
|
}
|
|
}
|
|
if (regno == PCOQ_HEAD_REGNUM || regno == PCOQ_TAIL_REGNUM)
|
|
buf[3] &= ~0x3;
|
|
supply_register (regno, buf);
|
|
error_exit:;
|
|
}
|
|
|
|
/* 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 (addr < text_end ? PT_RIUSER : PT_RDUSER,
|
|
inferior_pid, (PTRACE_ARG3_TYPE) addr, 0, 0);
|
|
}
|
|
|
|
if (count > 1) /* FIXME, avoid if even boundary */
|
|
{
|
|
buffer[count - 1]
|
|
= ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER, inferior_pid,
|
|
(PTRACE_ARG3_TYPE) (addr + (count - 1) * sizeof (int)),
|
|
0, 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))
|
|
{
|
|
/* The HP-UX kernel crashes if you use PT_WDUSER to write into the text
|
|
segment. FIXME -- does it work to write into the data segment using
|
|
WIUSER, or do these idiots really expect us to figure out which segment
|
|
the address is in, so we can use a separate system call for it??! */
|
|
errno = 0;
|
|
ptrace (addr < text_end ? PT_WIUSER : PT_WDUSER, inferior_pid,
|
|
(PTRACE_ARG3_TYPE) addr,
|
|
buffer[i], 0);
|
|
if (errno)
|
|
return 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Read all the longwords */
|
|
for (i = 0; i < count; i++, addr += sizeof (int))
|
|
{
|
|
errno = 0;
|
|
buffer[i] = ptrace (addr < text_end ? PT_RIUSER : PT_RDUSER,
|
|
inferior_pid, (PTRACE_ARG3_TYPE) addr, 0, 0);
|
|
if (errno)
|
|
return 0;
|
|
QUIT;
|
|
}
|
|
|
|
/* Copy appropriate bytes out of the buffer. */
|
|
memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len);
|
|
}
|
|
return len;
|
|
}
|