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[AArch64][3/4] New PAUTH builtins required by libgcc unwinder

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gcc/
	* 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.

From-SVN: r244669
This commit is contained in:
Jiong Wang 2017-01-20 00:10:11 +00:00 committed by Jiong Wang
parent 115ac9ff61
commit 312492bd5e
2 changed files with 82 additions and 0 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2017-01-19 Jiong Wang <jiong.wang@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.
2017-01-19 Jiong Wang <jiong.wang@arm.com>
* reg-notes.def (CFA_TOGGLE_RA_MANGLE): New reg-note.

73
gcc/config/aarch64/aarch64-builtins.c
View File

@ -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 +1328,44 @@ 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)