diff options
Diffstat (limited to 'ld/emultempl/aarch64elf.em')
| -rw-r--r-- | ld/emultempl/aarch64elf.em | 48 |
1 files changed, 47 insertions, 1 deletions
diff --git a/ld/emultempl/aarch64elf.em b/ld/emultempl/aarch64elf.em index afa91af..91d58d8 100644 --- a/ld/emultempl/aarch64elf.em +++ b/ld/emultempl/aarch64elf.em @@ -42,6 +42,11 @@ static aarch64_protection_opts sw_protections = { .gcs_report_dynamic = MARKING_UNSET, }; +static aarch64_memtag_opts memtag_opts = { + .memtag_mode = AARCH64_MEMTAG_MODE_NONE, + .memtag_stack = 0, +}; + #define COMPILE_TIME_STRLEN(s) \ (sizeof(s) - 1) @@ -335,7 +340,8 @@ aarch64_elf_create_output_section_statements (void) pic_veneer, fix_erratum_835769, fix_erratum_843419, no_apply_dynamic_relocs, - &sw_protections); + &sw_protections, + &memtag_opts); stub_file = lang_add_input_file ("linker stubs", lang_input_file_is_fake_enum, @@ -440,6 +446,31 @@ aarch64_parse_gcs_option (const char *_optarg) #undef GCS #undef GCS_LEN } + +static bool +aarch64_parse_memtag_mode_option (const char *_optarg) +{ + #define MEMTAG_MODE "memtag-mode" + #define MEMTAG_MODE_LEN COMPILE_TIME_STRLEN (MEMTAG_MODE) + + if (strncmp (_optarg, MEMTAG_MODE, MEMTAG_MODE_LEN) != 0) + return false; + + if (strcmp (_optarg + MEMTAG_MODE_LEN, "=none") == 0) + memtag_opts.memtag_mode = AARCH64_MEMTAG_MODE_NONE; + else if (strcmp (_optarg + MEMTAG_MODE_LEN, "=sync") == 0) + memtag_opts.memtag_mode = AARCH64_MEMTAG_MODE_SYNC; + else if (strcmp (_optarg + MEMTAG_MODE_LEN, "=async") == 0) + memtag_opts.memtag_mode = AARCH64_MEMTAG_MODE_ASYNC; + else + einfo (_("%X%P: error: unrecognized value '-z %s'\n"), _optarg); + + return true; + + #undef MEMTAG_MODE + #undef MEMTAG_MODE_LEN +} + EOF # Define some shell vars to insert bits of code into the standard elf @@ -518,6 +549,17 @@ PARSE_AND_LIST_OPTIONS=' and output have GCS marking.\n\ error: Emit error when the input objects are missing GCS markings\n\ and output have GCS marking.\n")); + fprintf (file, _("\ + -z memtag-mode[=none|sync|async] Select Memory Tagging Extension mode of operation to use.\n\ + Emits a DT_AARCH64_MEMTAG_MODE dynamic tag for the binary.\n\ + This entry is only valid on the main executable. It is\n\ + ignored in the dynamically loaded objects by the loader.\n\ + none (default): Disable MTE checking of memory reads and writes.\n\ + sync: Enable precise exceptions when mismatched address and\n\ + allocation tags detected on load/store operations.\n\ + async: Enable imprecise exceptions.\n")); + fprintf (file, _("\ + -z memtag-stack Mark program stack with MTE protection.\n")); ' PARSE_AND_LIST_ARGS_CASE_Z_AARCH64=' @@ -533,6 +575,10 @@ PARSE_AND_LIST_ARGS_CASE_Z_AARCH64=' {} else if (aarch64_parse_gcs_option (optarg)) {} + else if (aarch64_parse_memtag_mode_option (optarg)) + {} + else if (strcmp (optarg, "memtag-stack") == 0) + memtag_opts.memtag_stack = 1; ' PARSE_AND_LIST_ARGS_CASE_Z="$PARSE_AND_LIST_ARGS_CASE_Z $PARSE_AND_LIST_ARGS_CASE_Z_AARCH64" |