Enable PAC in addition to BTI on arm64 such that JIT code matches the

default branch protection provided by our base compiler.

ok jsg@

3 files changed, 5 insertions, 3 deletions

diff --git a/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_init.c b/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_init.c
index c9e24b8d6..ea8a22f70 100644
--- a/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_init.c
+++ b/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_init.c
@@ -361,7 +361,7 @@ init_gallivm_state(struct gallivm_state *gallivm, const char *name,
 #endif
 
 #if DETECT_ARCH_AARCH64
-   lp_set_module_branch_target_enforcement(gallivm->module);
+   lp_set_module_branch_protection(gallivm->module);
 #endif
 
    gallivm->builder = LLVMCreateBuilderInContext(gallivm->context);
diff --git a/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp b/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
index a1caece3e..b50a17427 100644
--- a/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
+++ b/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_misc.cpp
@@ -636,10 +636,12 @@ lp_set_module_stack_alignment_override(LLVMModuleRef MRef, unsigned align)
 }
 
 extern "C" void
-lp_set_module_branch_target_enforcement(LLVMModuleRef MRef)
+lp_set_module_branch_protection(LLVMModuleRef MRef)
 {
+   /* Enable standard (bti+pac-ret) branch protection */
    llvm::Module *M = llvm::unwrap(MRef);
    M->addModuleFlag(llvm::Module::Override, "branch-target-enforcement", 1);
+   M->addModuleFlag(llvm::Module::Override, "sign-return-address", 1);
 }
 
 using namespace llvm;
diff --git a/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_misc.h b/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_misc.h
index 2447bffef..fd6a4c343 100644
--- a/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_misc.h
+++ b/lib/mesa/src/gallium/auxiliary/gallivm/lp_bld_misc.h
@@ -96,7 +96,7 @@ void
 lp_set_module_stack_alignment_override(LLVMModuleRef M, unsigned align);
 
 void
-lp_set_module_branch_target_enforcement(LLVMModuleRef M);
+lp_set_module_branch_protection(LLVMModuleRef M);
 
 #ifdef __cplusplus
 }