Patch Detail
get:
Show a patch.
patch:
Update a patch.
put:
Update a patch.
GET /api/patches/2223095/?format=api
{ "id": 2223095, "url": "http://patchwork.ozlabs.org/api/patches/2223095/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260414124105.178141-3-claudiu.zissulescu-ianculescu@oracle.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/projects/17/?format=api", "name": "GNU Compiler Collection", "link_name": "gcc", "list_id": "gcc-patches.gcc.gnu.org", "list_email": "gcc-patches@gcc.gnu.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260414124105.178141-3-claudiu.zissulescu-ianculescu@oracle.com>", "list_archive_url": null, "date": "2026-04-14T12:41:05", "name": "[2/2] aarch64/mte: Implement MD_CLEAN_MEMTAG_RANGE hook", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "113067c241e9b445a1cccb10d9aabe4fe634690d", "submitter": { "id": 90509, "url": "http://patchwork.ozlabs.org/api/people/90509/?format=api", "name": "Claudiu Zissulescu", "email": "claudiu.zissulescu-ianculescu@oracle.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260414124105.178141-3-claudiu.zissulescu-ianculescu@oracle.com/mbox/", "series": [ { "id": 499832, "url": "http://patchwork.ozlabs.org/api/series/499832/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=499832", "date": "2026-04-14T12:41:04", "name": "Add bits for handling memory tags when using MTE instructions", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499832/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2223095/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2223095/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Delivered-To": [ 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"AW1haW4tMjYwNDE0MDExOSBTYWx0ZWRfX94jZOpm0+SvD\n zKbf5y3xaqHiBhPeP2IviSHyiOuyJLDX3YIpc4JcAeASSwlcwvEk/slB0CeVhMovMyy0l6jfbay\n nP1E/7TKxjZHbb1KvRBO3IXkQZatHEys4a12pmZPh1M8a7+Ev4Msnw2JTaC02i2hQBN9HUkSxwT\n b02TvKgXtTEcTcMEmaWwF29QdonFpCFhng5RnqklNwH4rM9CZ9VuvAT0M6bPo+W8+wKOWFOQLnx\n /7gqI4zyhzbuqz/7g1CtEJ6dP3oVWrV6PnpVDozL8SQY4bC80v3Ns2ai2xMJpvn/0MFRSaK36nI\n LbjsixazyRnE8L7cx7jzQiJyIQgLub5r5oLbfvIXt8+SMhFammE6SndKXpFmGistFqjyragf70q\n mkpVrsU85WW4DFEm+Qx1OLug3+F/IJTZpM73gzMC6OzCsk9X6xI86pxhs9NpHL0+x9QMIzl85HS\n mzDk8/Qylst5OhSi4x6n04nJZTpIKEcdVidCxdGk=", "X-Proofpoint-GUID": "56VjVV0yZfGoitJnB8ZnZfuaze5ODBbQ", "X-Proofpoint-ORIG-GUID": "56VjVV0yZfGoitJnB8ZnZfuaze5ODBbQ", "X-Authority-Analysis": "v=2.4 cv=JY6Ma0KV c=1 sm=1 tr=0 ts=69de35f3 b=1 cx=c_pps\n a=zPCbziy225d3KhSqZt3L1A==:117\n a=zPCbziy225d3KhSqZt3L1A==:17\n a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19\n a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=A5OVakUREuEA:10\n a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=jiCTI4zE5U7BLdzWsZGv:22\n a=3I1J8UUJPc9JN9BFgKH3:22 a=yPCof4ZbAAAA:8 a=urj103uPPKj4aODTR_0A:9 cc=ntf\n awl=host:12291", "X-BeenThere": "gcc-patches@gcc.gnu.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Gcc-patches mailing list <gcc-patches.gcc.gnu.org>", "List-Unsubscribe": "<https://gcc.gnu.org/mailman/options/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe>", "List-Archive": "<https://gcc.gnu.org/pipermail/gcc-patches/>", "List-Post": "<mailto:gcc-patches@gcc.gnu.org>", "List-Help": "<mailto:gcc-patches-request@gcc.gnu.org?subject=help>", "List-Subscribe": "<https://gcc.gnu.org/mailman/listinfo/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe>", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org" }, "content": "From: Claudiu Zissulescu <claudiu.zissulescu-ianculescu@oracle.com>\n\nImplement MD_CLEAN_MEMTAG_RANGE hook to clean up any residual memtags\nafter an exception is taken.\n\nThe patch contains the necessary bits to check if the system has MTE\nsupport, if yes, the MD_CLEAN_MEMTAG_RANGE hook is removing the tags\nbetween the two addresses provided. A test is also provided.\n\nSigned-off-by: Claudiu Zissulescu <claudiu.zissulescu-ianculescu@oracle.com>\n---\n gcc/testsuite/g++.target/aarch64/try-catch.C | 71 ++++++++++++++++++++\n libgcc/config/aarch64/linux-unwind.h | 68 +++++++++++++++++++\n 2 files changed, 139 insertions(+)\n create mode 100644 gcc/testsuite/g++.target/aarch64/try-catch.C", "diff": "diff --git a/gcc/testsuite/g++.target/aarch64/try-catch.C b/gcc/testsuite/g++.target/aarch64/try-catch.C\nnew file mode 100644\nindex 00000000000..75559c8a2c4\n--- /dev/null\n+++ b/gcc/testsuite/g++.target/aarch64/try-catch.C\n@@ -0,0 +1,71 @@\n+/* { dg-do run } */\n+/* { dg-require-effective-target memtag_exec } */\n+/* { dg-additional-options \"-fsanitize=memtag-stack -march=armv8.5-a+memtag -O2\" } */\n+\n+#include <stdlib.h>\n+#include <signal.h>\n+#include <string.h>\n+\n+extern \"C\"\n+{\n+ static void\n+ optimization_barrier (void *arg)\n+ {\n+ asm volatile(\"\" : : \"r\"(arg) : \"memory\");\n+ }\n+\n+ void handler (int nSig)\n+ {\n+ /* We hit the exception. Return error. */\n+ exit (1);\n+ }\n+\n+ static void setHandler (void)\n+ {\n+ signal (SIGSEGV, handler);\n+ }\n+\n+ void __attribute__((noinline))\n+ foo (void)\n+ {\n+ char x[15];\n+ optimization_barrier(x);\n+ throw 15;\n+ }\n+\n+ void __attribute__((noinline))\n+ hwasan_read (char *p, int size)\n+ {\n+ volatile char sink;\n+ for (int i = 0; i < size; ++i)\n+ sink = p[i];\n+ }\n+\n+ void __attribute__((noinline, no_sanitize(\"memtag-stack\")))\n+ after_catch ()\n+ {\n+ char x[10000];\n+ hwasan_read(&x[0], sizeof(x));\n+ }\n+\n+ void __attribute__((noinline))\n+ test_tag (void)\n+ {\n+ try {\n+ foo ();\n+ } catch (...) {\n+ after_catch ();\n+ // If no tag mismatch then we can see this.\n+ return;\n+ }\n+ __builtin_abort ();\n+ }\n+}\n+\n+int\n+main (void)\n+{\n+ setHandler ();\n+ test_tag ();\n+ return 0;\n+}\ndiff --git a/libgcc/config/aarch64/linux-unwind.h b/libgcc/config/aarch64/linux-unwind.h\nindex 8fb782ab996..f34bf29dc3c 100644\n--- a/libgcc/config/aarch64/linux-unwind.h\n+++ b/libgcc/config/aarch64/linux-unwind.h\n@@ -29,6 +29,49 @@\n #include <sys/ucontext.h>\n #include <stdint.h>\n \n+#ifdef __ARM_FEATURE_MEMORY_TAGGING\n+/* Avoid runtime MTE detection if libgcc is built with MTE. */\n+# define HAVE_MTE_CONST const\n+# define HAVE_MTE_VALUE 1\n+#elif __gnu_linux__\n+/* MTE access detection on Linux. */\n+# define HAVE_MTE_CONST\n+# define HAVE_MTE_VALUE 0\n+\n+# define AT_HWCAP2\t26\n+# define HWCAP2_MTE\t(1 << 18)\n+# define HAVE_MTE_CTOR mte_accessible ()\n+unsigned long int __getauxval (unsigned long int);\n+\n+static _Bool\n+mte_accessible (void)\n+{\n+ unsigned long hwcap2 = __getauxval (AT_HWCAP2);\n+ return (hwcap2 & HWCAP2_MTE) != 0;\n+}\n+#else /* !__gnu_linux__ */\n+# define HAVE_MTE_CONST const\n+# define HAVE_MTE_VALUE 0\n+#endif /* __ARM_FEATURE_MEMORY_TAGGING */\n+\n+static HAVE_MTE_CONST _Bool __aarch64_have_mte = HAVE_MTE_VALUE;\n+\n+#ifdef HAVE_MTE_CTOR\n+/* Use a higher priority to ensure it runs before user constructors\n+ with priority 100. */\n+static void __attribute__((constructor (90)))\n+init_have_mte (void)\n+{\n+ __aarch64_have_mte = HAVE_MTE_CTOR;\n+}\n+#endif\n+\n+#define MEMTAG_GRANULE_SIZE 16\n+#define MEMTAG_GRANULE_BITSIZE 4\n+\n+#pragma GCC aarch64 \"arm_acle.h\"\n+#define MD_CLEAN_MEMTAG_RANGE aarch64_clean_memtag_range\n+\n /* Since insns are always stored LE, on a BE system the opcodes will\n be loaded byte-reversed. Therefore, define two sets of opcodes,\n one for LE and one for BE. */\n@@ -266,4 +309,29 @@ aarch64_fallback_frame_state (struct _Unwind_Context *context,\n return _URC_NO_REASON;\n }\n \n+static void __attribute__((target(\"arch=armv8.5-a+memtag\")))\n+aarch64_clean_memtag_range (void *old_cfa,\n+\t\t\t void *new_cfa)\n+{\n+ volatile unsigned char *sp = (unsigned char *) old_cfa;\n+ size_t size = new_cfa - old_cfa;\n+\n+ /* If the system doesn't have memory tag machinery or it is missing, just\n+ skip this function. */\n+ if (!__aarch64_have_mte)\n+ return;\n+\n+ /* Sanity check. */\n+ if (old_cfa > new_cfa)\n+ return;\n+\n+ /* Adjust the size accordingly to the MTE granule and clean all the tags. */\n+ size >>= MEMTAG_GRANULE_BITSIZE;\n+ for (size_t i = 0; i < size; i++)\n+ {\n+ __arm_mte_set_tag ((volatile void *) sp);\n+ sp += MEMTAG_GRANULE_SIZE;\n+ }\n+}\n+\n #endif\n", "prefixes": [ "2/2" ] }