diff options
Diffstat (limited to 'gdb/arch')
| -rw-r--r-- | gdb/arch/aarch64-mte-linux.c | 56 | ||||
| -rw-r--r-- | gdb/arch/aarch64-mte-linux.h | 10 |
2 files changed, 66 insertions, 0 deletions
diff --git a/gdb/arch/aarch64-mte-linux.c b/gdb/arch/aarch64-mte-linux.c index fc7a8cc..3af6f36 100644 --- a/gdb/arch/aarch64-mte-linux.c +++ b/gdb/arch/aarch64-mte-linux.c @@ -21,6 +21,62 @@ /* See arch/aarch64-mte-linux.h */ +void +aarch64_mte_pack_tags (gdb::byte_vector &tags) +{ + /* Nothing to pack? */ + if (tags.empty ()) + return; + + /* If the tags vector has an odd number of elements, add another + zeroed-out element to make it even. This facilitates packing. */ + if ((tags.size () % 2) != 0) + tags.emplace_back (0); + + for (int unpacked = 0, packed = 0; unpacked < tags.size (); + unpacked += 2, packed++) + tags[packed] = (tags[unpacked + 1] << 4) | tags[unpacked]; + + /* Now we have half the size. */ + tags.resize (tags.size () / 2); +} + +/* See arch/aarch64-mte-linux.h */ + +void +aarch64_mte_unpack_tags (gdb::byte_vector &tags, bool skip_first) +{ + /* Nothing to unpack? */ + if (tags.empty ()) + return; + + /* An unpacked MTE tags vector will have twice the number of elements + compared to an unpacked one. */ + gdb::byte_vector unpacked_tags (tags.size () * 2); + + int unpacked = 0, packed = 0; + + if (skip_first) + { + /* We are not interested in the first unpacked element, just discard + it. */ + unpacked_tags[unpacked] = (tags[packed] >> 4) & 0xf; + unpacked++; + packed++; + } + + for (; packed < tags.size (); unpacked += 2, packed++) + { + unpacked_tags[unpacked] = tags[packed] & 0xf; + unpacked_tags[unpacked + 1] = (tags[packed] >> 4) & 0xf; + } + + /* Update the original tags vector. */ + tags = std::move (unpacked_tags); +} + +/* See arch/aarch64-mte-linux.h */ + size_t aarch64_mte_get_tag_granules (CORE_ADDR addr, size_t len, size_t granule_size) { diff --git a/gdb/arch/aarch64-mte-linux.h b/gdb/arch/aarch64-mte-linux.h index fed91bb..0771ef7 100644 --- a/gdb/arch/aarch64-mte-linux.h +++ b/gdb/arch/aarch64-mte-linux.h @@ -32,6 +32,7 @@ /* We have one tag per 16 bytes of memory. */ #define AARCH64_MTE_GRANULE_SIZE 16 +#define AARCH64_MTE_TAG_BIT_SIZE 4 #define AARCH64_MTE_LOGICAL_TAG_START_BIT 56 #define AARCH64_MTE_LOGICAL_MAX_VALUE 0xf @@ -71,4 +72,13 @@ extern CORE_ADDR aarch64_mte_set_ltag (CORE_ADDR address, CORE_ADDR tag); It is always possible to get the logical tag. */ extern CORE_ADDR aarch64_mte_get_ltag (CORE_ADDR address); +/* Given a TAGS vector containing 1 MTE tag per byte, pack the data as + 2 tags per byte and resize the vector. */ +extern void aarch64_mte_pack_tags (gdb::byte_vector &tags); + +/* Given a TAGS vector containing 2 MTE tags per byte, unpack the data as + 1 tag per byte and resize the vector. If SKIP_FIRST is TRUE, skip the + first unpacked element. Otherwise leave it in the unpacked vector. */ +extern void aarch64_mte_unpack_tags (gdb::byte_vector &tags, bool skip_first); + #endif /* ARCH_AARCH64_MTE_LINUX_H */ |