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Refactor parsing of /proc/<pid>/smaps

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The Linux kernel exposes the information about MTE-protected pages via the
proc filesystem, more specifically through the smaps file.

What we're looking for is a mapping with the 'mt' flag, which tells us that
mapping was created with a PROT_MTE flag and, thus, is capable of using memory
tagging.

We already parse that file for other purposes (core file
generation/filtering), so this patch refactors the code to make the parsing
of the smaps file reusable for memory tagging.

The function linux_address_in_memtag_page uses the refactored code to allow
querying for memory tag support in a particular address, and it gets used in the
next patch.

gdb/ChangeLog:

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

	* linux-tdep.c (struct smaps_vmflags) <memory_tagging>: New flag
	bit.
	(struct smaps_data): New struct.
	(decode_vmflags): Handle the 'mt' flag.
	(parse_smaps_data): New function, refactored from
	linux_find_memory_regions_full.
	(linux_address_in_memtag_page): New function.
	(linux_find_memory_regions_full): Refactor into parse_smaps_data.
	* linux-tdep.h (linux_address_in_memtag_page): New prototype.
This commit is contained in:
Luis Machado 2020-06-15 14:24:53 -03:00
parent 93e447c605
commit 1e735120b9
3 changed files with 251 additions and 122 deletions
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4
gdb/linux-tdep.h
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@ -43,6 +43,10 @@ DEF_ENUM_FLAGS_TYPE (enum linux_siginfo_extra_field_values,
struct type *linux_get_siginfo_type_with_fields (struct gdbarch *gdbarch,
linux_siginfo_extra_fields);
/* Return true if ADDRESS is within the boundaries of a page mapped with
memory tagging protection. */
bool linux_address_in_memtag_page (CORE_ADDR address);
typedef char *(*linux_collect_thread_registers_ftype) (const struct regcache *,
ptid_t,
bfd *, char *, int *,