On 11/11/16 18:22, Jiong Wang wrote:
This patch implements a few ARMv8.3-A new builtins for pointer sign and
authentication instructions.
Currently, these builtins are supposed to be used by libgcc EH unwinder
only. They are not public interface to external user.
OK to install?
gcc/
2016-11-11 Jiong Wang<jiong.w...@arm.com>
* config/aarch64/aarch64-builtins.c (enum aarch64_builtins): New
entries
for AARCH64_PAUTH_BUILTIN_PACI1716, AARCH64_PAUTH_BUILTIN_AUTIA1716,
AARCH64_PAUTH_BUILTIN_AUTIB1716, AARCH64_PAUTH_BUILTIN_XPACLRI.
(aarch64_init_v8_3_builtins): New.
(aarch64_init_builtins): Call aarch64_init_builtins.
(arch64_expand_builtin): Expand new builtins.
This patch is an update on builtins support. All these builtins are to be
internally used by libgcc only, so the updates only keeps those used.
OK for trunk?
gcc/
2017-01-06 Jiong Wang <jiong.w...@arm.com>
* config/aarch64/aarch64-builtins.c (enum aarch64_builtins): New entries
for AARCH64_PAUTH_BUILTIN_XPACLRI, AARCH64_PAUTH_BUILTIN_PACIA1716,
AARCH64_PAUTH_BUILTIN_AUTIA1716);
(aarch64_init_pauth_hint_builtins): New.
(aarch64_init_builtins): Call aarch64_init_pauth_hint_builtins.
(aarch64_expand_builtin): Expand new builtins.
diff --git a/gcc/config/aarch64/aarch64-builtins.c b/gcc/config/aarch64/aarch64-builtins.c
index 69fb756f0fbdc016f35ce1d08f2aaf092a034704..9ae9d9afc9c141235d7eee037d5571b9f35edc31 100644
--- a/gcc/config/aarch64/aarch64-builtins.c
+++ b/gcc/config/aarch64/aarch64-builtins.c
@@ -376,6 +376,10 @@ enum aarch64_builtins
AARCH64_CRC32_BUILTIN_BASE,
AARCH64_CRC32_BUILTINS
AARCH64_CRC32_BUILTIN_MAX,
+ /* ARMv8.3-A Pointer Authentication Builtins. */
+ AARCH64_PAUTH_BUILTIN_AUTIA1716,
+ AARCH64_PAUTH_BUILTIN_PACIA1716,
+ AARCH64_PAUTH_BUILTIN_XPACLRI,
AARCH64_BUILTIN_MAX
};
@@ -923,6 +927,33 @@ aarch64_init_fp16_types (void)
aarch64_fp16_ptr_type_node = build_pointer_type (aarch64_fp16_type_node);
}
+/* Pointer authentication builtins that will become NOP on legacy platform.
+ Currently, these builtins are for internal use only (libgcc EH unwinder). */
+
+void
+aarch64_init_pauth_hint_builtins (void)
+{
+ /* Pointer Authentication builtins. */
+ tree ftype_pointer_auth
+ = build_function_type_list (ptr_type_node, ptr_type_node,
+ unsigned_intDI_type_node, NULL_TREE);
+ tree ftype_pointer_strip
+ = build_function_type_list (ptr_type_node, ptr_type_node, NULL_TREE);
+
+ aarch64_builtin_decls[AARCH64_PAUTH_BUILTIN_AUTIA1716]
+ = add_builtin_function ("__builtin_aarch64_autia1716", ftype_pointer_auth,
+ AARCH64_PAUTH_BUILTIN_AUTIA1716, BUILT_IN_MD, NULL,
+ NULL_TREE);
+ aarch64_builtin_decls[AARCH64_PAUTH_BUILTIN_PACIA1716]
+ = add_builtin_function ("__builtin_aarch64_pacia1716", ftype_pointer_auth,
+ AARCH64_PAUTH_BUILTIN_PACIA1716, BUILT_IN_MD, NULL,
+ NULL_TREE);
+ aarch64_builtin_decls[AARCH64_PAUTH_BUILTIN_XPACLRI]
+ = add_builtin_function ("__builtin_aarch64_xpaclri", ftype_pointer_strip,
+ AARCH64_PAUTH_BUILTIN_XPACLRI, BUILT_IN_MD, NULL,
+ NULL_TREE);
+}
+
void
aarch64_init_builtins (void)
{
@@ -951,6 +982,10 @@ aarch64_init_builtins (void)
aarch64_init_crc32_builtins ();
aarch64_init_builtin_rsqrt ();
+
+/* Initialize pointer authentication builtins which are backed by instructions
+ in NOP encoding space. */
+ aarch64_init_pauth_hint_builtins ();
}
tree
@@ -1293,6 +1328,43 @@ aarch64_expand_builtin (tree exp,
}
emit_insn (pat);
return target;
+ case AARCH64_PAUTH_BUILTIN_AUTIA1716:
+ case AARCH64_PAUTH_BUILTIN_PACIA1716:
+ case AARCH64_PAUTH_BUILTIN_XPACLRI:
+ arg0 = CALL_EXPR_ARG (exp, 0);
+ op0 = force_reg (Pmode, expand_normal (arg0));
+
+ if (!target)
+ target = gen_reg_rtx (Pmode);
+ else
+ target = force_reg (Pmode, target);
+
+ emit_move_insn (target, op0);
+
+ if (fcode == AARCH64_PAUTH_BUILTIN_XPACLRI)
+ {
+ rtx lr = gen_rtx_REG (Pmode, R30_REGNUM);
+ icode = CODE_FOR_xpaclri;
+ emit_move_insn (lr, op0);
+ emit_insn (GEN_FCN (icode) ());
+ emit_move_insn (target, lr);
+ }
+ else
+ {
+ tree arg1 = CALL_EXPR_ARG (exp, 1);
+ rtx op1 = force_reg (Pmode, expand_normal (arg1));
+ icode = (fcode == AARCH64_PAUTH_BUILTIN_PACIA1716
+ ? CODE_FOR_paci1716 : CODE_FOR_auti1716);
+
+ rtx x16_reg = gen_rtx_REG (Pmode, R16_REGNUM);
+ rtx x17_reg = gen_rtx_REG (Pmode, R17_REGNUM);
+ emit_move_insn (x17_reg, op0);
+ emit_move_insn (x16_reg, op1);
+ emit_insn (GEN_FCN (icode) ());
+ emit_move_insn (target, x17_reg);
+ }
+
+ return target;
}
if (fcode >= AARCH64_SIMD_BUILTIN_BASE && fcode <= AARCH64_SIMD_BUILTIN_MAX)
