From 0c7c65e12f384d7035bf79e37ccbbc5d11cdc447 Mon Sep 17 00:00:00 2001 From: Luis Machado Date: Mon, 15 Jun 2020 14:24:53 -0300 Subject: Refactor parsing of /proc//smaps 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: YYYY-MM-DD Luis Machado * linux-tdep.c (struct smaps_vmflags) : 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. --- gdb/linux-tdep.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'gdb/linux-tdep.h') diff --git a/gdb/linux-tdep.h b/gdb/linux-tdep.h index 91c2873..32c9c03 100644 --- a/gdb/linux-tdep.h +++ b/gdb/linux-tdep.h @@ -41,6 +41,10 @@ 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 *, -- cgit v1.1