From: Claudiu Zissulescu <[email protected]>
Add a new target instruction. Hardware-assisted sanitizers on
architectures providing instructions to tag/untag memory can then
make use of this new instruction pattern. For example, the
memtag-stack sanitizer uses these instructions to tag and untag a
memory granule.
gcc/doc/
* md.texi (tag_memory): Add documentation.
gcc/
* target-insns.def (tag_memory): New target instruction.
Signed-off-by: Claudiu Zissulescu <[email protected]>
---
gcc/doc/md.texi | 5 +++++
gcc/target-insns.def | 1 +
2 files changed, 6 insertions(+)
diff --git a/gcc/doc/md.texi b/gcc/doc/md.texi
index 44e1149bea8..82fef3ef867 100644
--- a/gcc/doc/md.texi
+++ b/gcc/doc/md.texi
@@ -8603,6 +8603,11 @@ the values were equal.
If this pattern is not defined, then a plain compare pattern and
conditional branch pattern is used.
+@cindex @code{tag_memory} instruction pattern
+This pattern tags an object that begins at the address specified by
+operand 0, has the byte size indicated by the operand 2, and uses the
+tag from operand 1.
+
@cindex @code{clear_cache} instruction pattern
@item @samp{clear_cache}
This pattern, if defined, flushes the instruction cache for a region of
diff --git a/gcc/target-insns.def b/gcc/target-insns.def
index 59025a20bf7..16e1d8cf565 100644
--- a/gcc/target-insns.def
+++ b/gcc/target-insns.def
@@ -102,6 +102,7 @@ DEF_TARGET_INSN (stack_protect_combined_test, (rtx x0, rtx
x1, rtx x2))
DEF_TARGET_INSN (stack_protect_test, (rtx x0, rtx x1, rtx x2))
DEF_TARGET_INSN (store_multiple, (rtx x0, rtx x1, rtx x2))
DEF_TARGET_INSN (tablejump, (rtx x0, rtx x1))
+DEF_TARGET_INSN (tag_memory, (rtx x0, rtx x1, rtx x2))
DEF_TARGET_INSN (trap, (void))
DEF_TARGET_INSN (unique, (void))
DEF_TARGET_INSN (untyped_call, (rtx x0, rtx x1, rtx x2))
--
2.51.0
