From 1e735120b95236b1f0fd8c383e64b02b64909d7c 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: 2021-03-24 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/ChangeLog | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'gdb/ChangeLog') diff --git a/gdb/ChangeLog b/gdb/ChangeLog index da4bb26..9d155b8 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,5 +1,17 @@ 2021-03-24 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. + +2021-03-24 Luis Machado + * linux-tdep.c (linux_find_memory_regions_full): Use std::string instead of char arrays. -- cgit v1.1