/* Low level Unix child interface to ptrace, for GDB when running under Unix.
- Copyright 1988, 89, 90, 91, 92, 93, 94, 95, 96, 1998, 2001
+ Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
+ 1998, 1999, 2000, 2001, 2002
Free Software Foundation, Inc.
This file is part of GDB.
#include "inferior.h"
#include "target.h"
#include "gdb_string.h"
+#include "regcache.h"
#include "gdb_wait.h"
static void store_register (int);
#endif
-/*
- * Some systems (Linux) may have threads implemented as pseudo-processes,
- * in which case we may be tracing more than one process at a time.
- * In that case, inferior_pid will contain the main process ID and the
- * individual thread (process) id mashed together. These macros are
- * used to separate them out. The definitions may be overridden in tm.h
- *
- * NOTE: default definitions here are for systems with no threads.
- * Useful definitions MUST be provided in tm.h
- */
-
-#if !defined (PIDGET) /* Default definition for PIDGET/TIDGET. */
-#define PIDGET(PID) PID
-#define TIDGET(PID) 0
-#endif
-
void _initialize_kernel_u_addr (void);
void _initialize_infptrace (void);
\f
hook before returning. */
int
-ptrace_wait (int pid, int *status)
+ptrace_wait (ptid_t ptid, int *status)
{
int wstate;
wstate = wait (status);
- target_post_wait (wstate, *status);
+ target_post_wait (pid_to_ptid (wstate), *status);
return wstate;
}
+#ifndef KILL_INFERIOR
void
kill_inferior (void)
{
int status;
+ int pid = PIDGET (inferior_ptid);
- if (inferior_pid == 0)
+ if (pid == 0)
return;
/* This once used to call "kill" to kill the inferior just in case
The kill call causes problems under hpux10, so it's been removed;
if this causes problems we'll deal with them as they arise. */
- ptrace (PT_KILL, inferior_pid, (PTRACE_ARG3_TYPE) 0, 0);
- ptrace_wait (0, &status);
+ ptrace (PT_KILL, pid, (PTRACE_ARG3_TYPE) 0, 0);
+ ptrace_wait (null_ptid, &status);
target_mourn_inferior ();
}
+#endif /* KILL_INFERIOR */
#ifndef CHILD_RESUME
If SIGNAL is nonzero, give it that signal. */
void
-child_resume (int pid, int step, enum target_signal signal)
+child_resume (ptid_t ptid, int step, enum target_signal signal)
{
+ int pid = PIDGET (ptid);
+
errno = 0;
if (pid == -1)
/* Resume all threads. */
/* I think this only gets used in the non-threaded case, where "resume
- all threads" and "resume inferior_pid" are the same. */
- pid = inferior_pid;
+ all threads" and "resume inferior_ptid" are the same. */
+ pid = PIDGET (inferior_ptid);
/* 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
if (step)
{
- if (SOFTWARE_SINGLE_STEP_P)
- abort (); /* Make sure this doesn't happen. */
+ if (SOFTWARE_SINGLE_STEP_P ())
+ internal_error (__FILE__, __LINE__, "failed internal consistency check"); /* Make sure this doesn't happen. */
else
ptrace (PT_STEP, pid, (PTRACE_ARG3_TYPE) 1,
target_signal_to_host (signal));
detach (int signal)
{
errno = 0;
- ptrace (PT_DETACH, inferior_pid, (PTRACE_ARG3_TYPE) 1, signal);
+ ptrace (PT_DETACH, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) 1,
+ signal);
if (errno)
- perror_with_name ("ptrace");
+ print_sys_errmsg ("ptrace", errno);
attach_flag = 0;
}
#endif /* ATTACH_DETACH */
/* 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 (PT_READ_U, PIDGET (inferior_ptid), \
(PTRACE_ARG3_TYPE) (offsetof (struct user, u_ar0)), 0) \
- KERNEL_U_ADDR
#endif
-/* Registers we shouldn't try to fetch. */
-#if !defined (CANNOT_FETCH_REGISTER)
-#define CANNOT_FETCH_REGISTER(regno) 0
-#endif
-
/* Fetch one register. */
static void
/* This isn't really an address. But ptrace thinks of it as one. */
CORE_ADDR regaddr;
char mess[128]; /* For messages */
- register int i;
+ int i;
unsigned int offset; /* Offset of registers within the u area. */
- char buf[MAX_REGISTER_RAW_SIZE];
+ char buf[MAX_REGISTER_SIZE];
int tid;
if (CANNOT_FETCH_REGISTER (regno))
}
/* Overload thread id onto process id */
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* no thread id, just use process id */
+ if ((tid = TIDGET (inferior_ptid)) == 0)
+ tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
offset = U_REGS_OFFSET;
}
else
{
- for (regno = 0; regno < ARCH_NUM_REGS; regno++)
+ for (regno = 0; regno < NUM_REGS; regno++)
{
fetch_register (regno);
}
}
}
-/* Registers we shouldn't try to store. */
-#if !defined (CANNOT_STORE_REGISTER)
-#define CANNOT_STORE_REGISTER(regno) 0
-#endif
-
/* Store one register. */
static void
/* This isn't really an address. But ptrace thinks of it as one. */
CORE_ADDR regaddr;
char mess[128]; /* For messages */
- register int i;
+ int i;
unsigned int offset; /* Offset of registers within the u area. */
int tid;
+ char buf[MAX_REGISTER_SIZE];
if (CANNOT_STORE_REGISTER (regno))
{
}
/* Overload thread id onto process id */
- if ((tid = TIDGET (inferior_pid)) == 0)
- tid = inferior_pid; /* no thread id, just use process id */
+ if ((tid = TIDGET (inferior_ptid)) == 0)
+ tid = PIDGET (inferior_ptid); /* no thread id, just use process id */
offset = U_REGS_OFFSET;
regaddr = register_addr (regno, offset);
+
+ /* Put the contents of regno into a local buffer */
+ regcache_collect (regno, buf);
+
+ /* Store the local buffer into the inferior a chunk at the time. */
for (i = 0; i < REGISTER_RAW_SIZE (regno); i += sizeof (PTRACE_XFER_TYPE))
{
errno = 0;
ptrace (PT_WRITE_U, tid, (PTRACE_ARG3_TYPE) regaddr,
- *(PTRACE_XFER_TYPE *) & registers[REGISTER_BYTE (regno) + i]);
+ *(PTRACE_XFER_TYPE *) (buf + i));
regaddr += sizeof (PTRACE_XFER_TYPE);
if (errno != 0)
{
}
else
{
- for (regno = 0; regno < ARCH_NUM_REGS; regno++)
+ for (regno = 0; regno < NUM_REGS; regno++)
{
store_register (regno);
}
#endif /* !defined (FETCH_INFERIOR_REGISTERS). */
\f
+/* Set an upper limit on alloca. */
+#ifndef GDB_MAX_ALLOCA
+#define GDB_MAX_ALLOCA 0x1000
+#endif
+
#if !defined (CHILD_XFER_MEMORY)
/* 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. */
+ 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. TARGET is ignored.
+/* 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. TARGET is ignored.
- 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. */
+ 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 (CORE_ADDR memaddr, char *myaddr, int len, int write,
- struct mem_attrib *attrib ATTRIBUTE_UNUSED,
- struct target_ops *target)
+ struct mem_attrib *attrib, struct target_ops *target)
{
- register int i;
+ int i;
/* Round starting address down to longword boundary. */
- register CORE_ADDR addr = memaddr & -sizeof (PTRACE_XFER_TYPE);
+ CORE_ADDR addr = memaddr & -(CORE_ADDR) sizeof (PTRACE_XFER_TYPE);
/* Round ending address up; get number of longwords that makes. */
- register int count
- = (((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
- / sizeof (PTRACE_XFER_TYPE);
+ int count = ((((memaddr + len) - addr) + sizeof (PTRACE_XFER_TYPE) - 1)
+ / sizeof (PTRACE_XFER_TYPE));
+ int alloc = count * sizeof (PTRACE_XFER_TYPE);
+ PTRACE_XFER_TYPE *buffer;
+ struct cleanup *old_chain = NULL;
+
+#ifdef PT_IO
+ /* OpenBSD 3.1, NetBSD 1.6 and FreeBSD 5.0 have a new PT_IO request
+ that promises to be much more efficient in reading and writing
+ data in the traced process's address space. */
+
+ {
+ struct ptrace_io_desc piod;
+
+ /* NOTE: We assume that there are no distinct address spaces for
+ instruction and data. */
+ piod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D;
+ piod.piod_offs = (void *) memaddr;
+ piod.piod_addr = myaddr;
+ piod.piod_len = len;
+
+ if (ptrace (PT_IO, PIDGET (inferior_ptid), (caddr_t) &piod, 0) == -1)
+ {
+ /* If the PT_IO request is somehow not supported, fallback on
+ using PT_WRITE_D/PT_READ_D. Otherwise we will return zero
+ to indicate failure. */
+ if (errno != EINVAL)
+ return 0;
+ }
+ else
+ {
+ /* Return the actual number of bytes read or written. */
+ return piod.piod_len;
+ }
+ }
+#endif
+
/* Allocate buffer of that many longwords. */
- register PTRACE_XFER_TYPE *buffer
- = (PTRACE_XFER_TYPE *) alloca (count * sizeof (PTRACE_XFER_TYPE));
+ if (len < GDB_MAX_ALLOCA)
+ {
+ buffer = (PTRACE_XFER_TYPE *) alloca (alloc);
+ }
+ else
+ {
+ buffer = (PTRACE_XFER_TYPE *) xmalloc (alloc);
+ old_chain = make_cleanup (xfree, buffer);
+ }
if (write)
{
- /* Fill start and end extra bytes of buffer with existing memory data. */
-
+ /* Fill start and end extra bytes of buffer with existing memory
+ data. */
if (addr != memaddr || len < (int) sizeof (PTRACE_XFER_TYPE))
{
/* Need part of initial word -- fetch it. */
- buffer[0] = ptrace (PT_READ_I, PIDGET (inferior_pid),
+ buffer[0] = ptrace (PT_READ_I, PIDGET (inferior_ptid),
(PTRACE_ARG3_TYPE) addr, 0);
}
- if (count > 1) /* FIXME, avoid if even boundary */
+ if (count > 1) /* FIXME, avoid if even boundary. */
{
- buffer[count - 1]
- = ptrace (PT_READ_I, PIDGET (inferior_pid),
- ((PTRACE_ARG3_TYPE)
- (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))),
- 0);
+ buffer[count - 1] =
+ ptrace (PT_READ_I, PIDGET (inferior_ptid),
+ ((PTRACE_ARG3_TYPE)
+ (addr + (count - 1) * sizeof (PTRACE_XFER_TYPE))), 0);
}
- /* Copy data to be written over corresponding part of buffer */
-
+ /* Copy data to be written over corresponding part of buffer. */
memcpy ((char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
- myaddr,
- len);
+ myaddr, len);
/* Write the entire buffer. */
-
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
{
errno = 0;
- ptrace (PT_WRITE_D, PIDGET (inferior_pid),
+ ptrace (PT_WRITE_D, PIDGET (inferior_ptid),
(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, PIDGET (inferior_pid),
+ ptrace (PT_WRITE_I, PIDGET (inferior_ptid),
(PTRACE_ARG3_TYPE) addr, buffer[i]);
}
if (errno)
}
else
{
- /* Read all the longwords */
+ /* Read all the longwords. */
for (i = 0; i < count; i++, addr += sizeof (PTRACE_XFER_TYPE))
{
errno = 0;
- buffer[i] = ptrace (PT_READ_I, PIDGET (inferior_pid),
+ buffer[i] = ptrace (PT_READ_I, PIDGET (inferior_ptid),
(PTRACE_ARG3_TYPE) addr, 0);
if (errno)
return 0;
(char *) buffer + (memaddr & (sizeof (PTRACE_XFER_TYPE) - 1)),
len);
}
+
+ if (old_chain != NULL)
+ do_cleanups (old_chain);
return len;
}
\f
udot_info (char *dummy1, int dummy2)
{
#if defined (KERNEL_U_SIZE)
- int udot_off; /* Offset into user struct */
+ long udot_off; /* Offset into user struct */
int udot_val; /* Value from user struct at udot_off */
char mess[128]; /* For messages */
#endif
{
printf_filtered ("\n");
}
- printf_filtered ("%04x:", udot_off);
+ printf_filtered ("%s:", paddr (udot_off));
}
- udot_val = ptrace (PT_READ_U, inferior_pid, (PTRACE_ARG3_TYPE) udot_off, 0);
+ udot_val = ptrace (PT_READ_U, PIDGET (inferior_ptid), (PTRACE_ARG3_TYPE) udot_off, 0);
if (errno != 0)
{
- sprintf (mess, "\nreading user struct at offset 0x%x", udot_off);
+ sprintf (mess, "\nreading user struct at offset 0x%s",
+ paddr_nz (udot_off));
perror_with_name (mess);
}
/* Avoid using nonportable (?) "*" in print specs */
projects / deliverable / binutils-gdb.git / blobdiff