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Fetch the ELF auxiliary vector from live processes on FreeBSD.

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Use the kern.proc.auxv.<pid> sysctl to fetch the ELF auxiliary vector for
a live process.

gdb/ChangeLog:

	* fbsd-nat.c [KERN_PROC_AUXV] New variable super_xfer_partial.
	(fbsd_xfer_partial): New function.
	(fbsd_nat_add_target) [KERN_PROC_AUXV] Set "to_xfer_partial" to
	"fbsd_xfer_partial".
This commit is contained in:
John Baldwin 2016-06-11 15:07:38 -07:00
parent aa1ed4a93a
commit 7697fc9ec3
2 changed files with 83 additions and 0 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2016-06-24 John Baldwin <jhb@FreeBSD.org>
* fbsd-nat.c [KERN_PROC_AUXV] New variable super_xfer_partial.
(fbsd_xfer_partial): New function.
(fbsd_nat_add_target) [KERN_PROC_AUXV] Set "to_xfer_partial" to
"fbsd_xfer_partial".
2016-06-23 Tom Tromey <tom@tromey.com>
* symtab.c (symbol_find_demangled_name): Loop over languages and

76
gdb/fbsd-nat.c
View File

@ -206,6 +206,78 @@ fbsd_find_memory_regions (struct target_ops *self,
}
#endif
#ifdef KERN_PROC_AUXV
static enum target_xfer_status (*super_xfer_partial) (struct target_ops *ops,
enum target_object object,
const char *annex,
gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset,
ULONGEST len,
ULONGEST *xfered_len);
/* Implement the "to_xfer_partial target_ops" method. */
static enum target_xfer_status
fbsd_xfer_partial (struct target_ops *ops, enum target_object object,
const char *annex, gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
{
pid_t pid = ptid_get_pid (inferior_ptid);
switch (object)
{
case TARGET_OBJECT_AUXV:
{
struct cleanup *cleanup = make_cleanup (null_cleanup, NULL);
unsigned char *buf;
size_t buflen;
int mib[4];
if (writebuf != NULL)
return TARGET_XFER_E_IO;
mib[0] = CTL_KERN;
mib[1] = KERN_PROC;
mib[2] = KERN_PROC_AUXV;
mib[3] = pid;
if (offset == 0)
{
buf = readbuf;
buflen = len;
}
else
{
buflen = offset + len;
buf = XCNEWVEC (unsigned char, buflen);
cleanup = make_cleanup (xfree, buf);
}
if (sysctl (mib, 4, buf, &buflen, NULL, 0) == 0)
{
if (offset != 0)
{
if (buflen > offset)
{
buflen -= offset;
memcpy (readbuf, buf + offset, buflen);
}
else
buflen = 0;
}
do_cleanups (cleanup);
*xfered_len = buflen;
return (buflen == 0) ? TARGET_XFER_EOF : TARGET_XFER_OK;
}
do_cleanups (cleanup);
return TARGET_XFER_E_IO;
}
default:
return super_xfer_partial (ops, object, annex, readbuf, writebuf, offset,
len, xfered_len);
}
}
#endif
#ifdef PT_LWPINFO
static int debug_fbsd_lwp;
@ -824,6 +896,10 @@ fbsd_nat_add_target (struct target_ops *t)
{
t->to_pid_to_exec_file = fbsd_pid_to_exec_file;
t->to_find_memory_regions = fbsd_find_memory_regions;
#ifdef KERN_PROC_AUXV
super_xfer_partial = t->to_xfer_partial;
t->to_xfer_partial = fbsd_xfer_partial;
#endif
#ifdef PT_LWPINFO
t->to_thread_alive = fbsd_thread_alive;
t->to_pid_to_str = fbsd_pid_to_str;