From 68cffbbd4406b4efe1aa6e18460b1d7ca02549f1 Mon Sep 17 00:00:00 2001 From: Luis Machado Date: Thu, 31 Mar 2022 11:42:35 +0100 Subject: [AArch64] MTE corefile support Teach GDB how to dump memory tags for AArch64 when using the gcore command and how to read memory tag data back from a core file generated by GDB (via gcore) or by the Linux kernel. The format is documented in the Linux Kernel documentation [1]. Each tagged memory range (listed in /proc//smaps) gets dumped to its own PT_AARCH64_MEMTAG_MTE segment. A section named ".memtag" is created for each of those segments when reading the core file back. To save a little bit of space, given MTE tags only take 4 bits, the memory tags are stored packed as 2 tags per byte. When reading the data back, the tags are unpacked. I've added a new testcase to exercise the feature. Build-tested with --enable-targets=all and regression tested on aarch64-linux Ubuntu 20.04. [1] Documentation/arm64/memory-tagging-extension.rst (Core Dump Support) --- gdb/gdbarch-gen.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) (limited to 'gdb/gdbarch-gen.h') diff --git a/gdb/gdbarch-gen.h b/gdb/gdbarch-gen.h index ddcb4c5..0504962 100644 --- a/gdb/gdbarch-gen.h +++ b/gdb/gdbarch-gen.h @@ -874,6 +874,32 @@ typedef int (gdbarch_find_memory_regions_ftype) (struct gdbarch *gdbarch, find_m extern int gdbarch_find_memory_regions (struct gdbarch *gdbarch, find_memory_region_ftype func, void *data); extern void set_gdbarch_find_memory_regions (struct gdbarch *gdbarch, gdbarch_find_memory_regions_ftype *find_memory_regions); +/* Given a bfd OBFD, segment ADDRESS and SIZE, create a memory tag section to be dumped to a core file */ + +extern bool gdbarch_create_memtag_section_p (struct gdbarch *gdbarch); + +typedef asection * (gdbarch_create_memtag_section_ftype) (struct gdbarch *gdbarch, bfd *obfd, CORE_ADDR address, size_t size); +extern asection * gdbarch_create_memtag_section (struct gdbarch *gdbarch, bfd *obfd, CORE_ADDR address, size_t size); +extern void set_gdbarch_create_memtag_section (struct gdbarch *gdbarch, gdbarch_create_memtag_section_ftype *create_memtag_section); + +/* Given a memory tag section OSEC, fill OSEC's contents with the appropriate tag data */ + +extern bool gdbarch_fill_memtag_section_p (struct gdbarch *gdbarch); + +typedef bool (gdbarch_fill_memtag_section_ftype) (struct gdbarch *gdbarch, asection *osec); +extern bool gdbarch_fill_memtag_section (struct gdbarch *gdbarch, asection *osec); +extern void set_gdbarch_fill_memtag_section (struct gdbarch *gdbarch, gdbarch_fill_memtag_section_ftype *fill_memtag_section); + +/* Decode a memory tag SECTION and return the tags of type TYPE contained in + the memory range [ADDRESS, ADDRESS + LENGTH). + If no tags were found, return an empty vector. */ + +extern bool gdbarch_decode_memtag_section_p (struct gdbarch *gdbarch); + +typedef gdb::byte_vector (gdbarch_decode_memtag_section_ftype) (struct gdbarch *gdbarch, bfd_section *section, int type, CORE_ADDR address, size_t length); +extern gdb::byte_vector gdbarch_decode_memtag_section (struct gdbarch *gdbarch, bfd_section *section, int type, CORE_ADDR address, size_t length); +extern void set_gdbarch_decode_memtag_section (struct gdbarch *gdbarch, gdbarch_decode_memtag_section_ftype *decode_memtag_section); + /* Read offset OFFSET of TARGET_OBJECT_LIBRARIES formatted shared libraries list from core file into buffer READBUF with length LEN. Return the number of bytes read (zero indicates failure). -- cgit v1.1