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Generate NT_PROCSTAT_{AUXV,VMMAP,PS_STRINGS} in FreeBSD coredumps

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gcore generates NT_AUXV and NT_FILE notes for Linux targets.  On
FreeBSD auxv is stored in a NT_PROCSTAT_AUXV section, virtual memory
mappings are stored in a NT_PROCSTAT_VMMAP, and both are prefixed with
the struct size.  In addition, store a NT_PROCSTAT_PS_STRINGS note
saving the initial location of the argv[] and environment[] arrays.

gdb/ChangeLog:

	PR gdb/23105
	* fbsd-nat.c (fbsd_nat_target::xfer_partial): Add support for
	TARGET_OBJECT_FREEBSD_VMMAP and TARGET_OBJECT_FREEBSD_PS_STRINGS.
	* fbsd-tdep.c (fbsd_make_note_desc): New.
	(fbsd_make_corefile_notes): Write NT_PROCSTAT_AUXV,
	NT_PROCSTAT_VMMAP and NT_PROCSTAT_PS_STRINGS notes.
	* target.h (enum target_object) Add FreeBSD-specific
	TARGET_OBJECT_FREEBSD_VMMAP and TARGET_OBJECT_FREEBSD_PS_STRINGS.
This commit is contained in:
Simon Ser
2018-09-06 15:03:19 -07:00
committed by John Baldwin
parent d82b3862f1
commit 739ab2e92e
4 changed files with 126 additions and 0 deletions
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56
gdb/fbsd-tdep.c
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@ -512,6 +512,28 @@ fbsd_corefile_thread (struct thread_info *info,
args->note_size, args->stop_signal);
}
/* Return a byte_vector containing the contents of a core dump note
for the target object of type OBJECT. If STRUCTSIZE is non-zero,
the data is prefixed with a 32-bit integer size to match the format
used in FreeBSD NT_PROCSTAT_* notes. */
static gdb::optional<gdb::byte_vector>
fbsd_make_note_desc (enum target_object object, uint32_t structsize)
{
gdb::optional<gdb::byte_vector> buf =
target_read_alloc (current_top_target (), object, NULL);
if (!buf || buf->empty ())
return {};
if (structsize == 0)
return buf;
gdb::byte_vector desc (sizeof (structsize) + buf->size ());
memcpy (desc.data (), &structsize, sizeof (structsize));
memcpy (desc.data () + sizeof (structsize), buf->data (), buf->size ());
return desc;
}
/* Create appropriate note sections for a corefile, returning them in
allocated memory. */
@ -586,6 +608,40 @@ fbsd_make_corefile_notes (struct gdbarch *gdbarch, bfd *obfd, int *note_size)
note_data = thread_args.note_data;
/* Auxiliary vector. */
uint32_t structsize = gdbarch_ptr_bit (gdbarch) / 4; /* Elf_Auxinfo */
gdb::optional<gdb::byte_vector> note_desc =
fbsd_make_note_desc (TARGET_OBJECT_AUXV, structsize);
if (note_desc && !note_desc->empty ())
{
note_data = elfcore_write_note (obfd, note_data, note_size, "FreeBSD",
NT_FREEBSD_PROCSTAT_AUXV,
note_desc->data (), note_desc->size ());
if (!note_data)
return NULL;
}
/* Virtual memory mappings. */
note_desc = fbsd_make_note_desc (TARGET_OBJECT_FREEBSD_VMMAP, 0);
if (note_desc && !note_desc->empty ())
{
note_data = elfcore_write_note (obfd, note_data, note_size, "FreeBSD",
NT_FREEBSD_PROCSTAT_VMMAP,
note_desc->data (), note_desc->size ());
if (!note_data)
return NULL;
}
note_desc = fbsd_make_note_desc (TARGET_OBJECT_FREEBSD_PS_STRINGS, 0);
if (note_desc && !note_desc->empty ())
{
note_data = elfcore_write_note (obfd, note_data, note_size, "FreeBSD",
NT_FREEBSD_PROCSTAT_PSSTRINGS,
note_desc->data (), note_desc->size ());
if (!note_data)
return NULL;
}
return note_data;
}