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New gdbarch memory tagging hooks

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We need some new gdbarch hooks to help us manipulate memory tags without having
to have GDB call the target methods directly.

This patch adds the following hooks:

gdbarch_memtag_to_string
--
Returns a printable string corresponding to the tag.

gdbarch_tagged_address_p
--
Checks if a particular address is protected with memory tagging.

gdbarch_memtag_matches_p
--
Checks if the logical tag of a pointer and the allocation tag from the address
the pointer points to matches.

gdbarch_set_memtags:
--
Sets either the allocation tag or the logical tag for a particular value.

gdbarch_get_memtag:
--
Gets either the allocation tag or the logical tag for a particular value.

gdbarch_memtag_granule_size
--
Sets the memory tag granule size, which represents the number of bytes a
particular allocation tag covers. For example, this is 16 bytes for
AArch64's MTE.

I've used struct value as opposed to straight CORE_ADDR so other architectures
can use the infrastructure without having to rely on a particular type for
addresses/pointers.  Some architecture may use pointers of 16 bytes that don't
fit in a CORE_ADDR, for example.

gdb/ChangeLog:

2021-03-24  Luis Machado  <luis.machado@linaro.org>

	* arch-utils.c (default_memtag_to_string, default_tagged_address_p)
	(default_memtag_matches_p, default_set_memtags)
	(default_get_memtag): New functions.
	* arch-utils.h (default_memtag_to_string, default_tagged_address_p)
	(default_memtag_matches_p, default_set_memtags)
	(default_get_memtag): New prototypes.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Regenerate.
	* gdbarch.sh (memtag_to_string, tagged_address_p, memtag_matches_p)
	(set_memtags, get_memtag, memtag_granule_size): New gdbarch hooks.
	(enum memtag_type): New enum.
This commit is contained in:
Luis Machado
2020-06-19 17:36:14 -03:00
parent dbe692af2d
commit c193949e75
6 changed files with 314 additions and 1 deletions
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49
gdb/arch-utils.c
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@ -77,6 +77,55 @@ legacy_register_sim_regno (struct gdbarch *gdbarch, int regnum)
return LEGACY_SIM_REGNO_IGNORE;
}
/* See arch-utils.h */
std::string
default_memtag_to_string (struct gdbarch *gdbarch, struct value *tag)
{
error (_("This architecture has no method to convert a memory tag to"
" a string."));
}
/* See arch-utils.h */
bool
default_tagged_address_p (struct gdbarch *gdbarch, struct value *address)
{
/* By default, assume the address is untagged. */
return false;
}
/* See arch-utils.h */
bool
default_memtag_matches_p (struct gdbarch *gdbarch, struct value *address)
{
/* By default, assume the tags match. */
return true;
}
/* See arch-utils.h */
bool
default_set_memtags (struct gdbarch *gdbarch, struct value *address,
size_t length, const gdb::byte_vector &tags,
memtag_type tag_type)
{
/* By default, return true (successful); */
return true;
}
/* See arch-utils.h */
struct value *
default_get_memtag (struct gdbarch *gdbarch, struct value *address,
memtag_type tag_type)
{
/* By default, return no tag. */
return nullptr;
}
CORE_ADDR
generic_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
{