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Enable some pointer authentication instructions for aarch64 v8a targets

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- Some of the v8.3 pointer authentication instruction inhabit the Hint space
- These instructions can be assembled to hint instructions which act as NOP instructions prior to v8.3
- This patch permits using the hint instructions for all v8a targets
- Also, correct the RETA{A,B} instructions to match the instruction attributes of RET (set isTerminator and isBarrier)

Differential Revision: https://reviews.llvm.org/D49786

llvm-svn: 338029
This commit is contained in:
Luke Cheeseman 2018-07-26 14:00:50 +00:00
parent 3a4f44dd20
commit c95fecf0df
2 changed files with 41 additions and 38 deletions
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53
lib/Target/AArch64/AArch64InstrInfo.td
View File

@ -516,31 +516,34 @@ defm FCADD : SIMDThreeSameVectorComplexHSD<1, 0b111, complexrotateopodd,
defm FCMLA : SIMDIndexedTiedComplexHSD<1, 0, 1, complexrotateop, "fcmla",
null_frag>;
// v8.3a Pointer Authentication
// These instructions inhabit part of the hint space and so can be used for
// armv8 targets
let Uses = [LR], Defs = [LR] in {
def PACIAZ : SystemNoOperands<0b000, "paciaz">;
def PACIBZ : SystemNoOperands<0b010, "pacibz">;
def AUTIAZ : SystemNoOperands<0b100, "autiaz">;
def AUTIBZ : SystemNoOperands<0b110, "autibz">;
}
let Uses = [LR, SP], Defs = [LR] in {
def PACIASP : SystemNoOperands<0b001, "paciasp">;
def PACIBSP : SystemNoOperands<0b011, "pacibsp">;
def AUTIASP : SystemNoOperands<0b101, "autiasp">;
def AUTIBSP : SystemNoOperands<0b111, "autibsp">;
}
let Uses = [X16, X17], Defs = [X17], CRm = 0b0001 in {
def PACIA1716 : SystemNoOperands<0b000, "pacia1716">;
def PACIB1716 : SystemNoOperands<0b010, "pacib1716">;
def AUTIA1716 : SystemNoOperands<0b100, "autia1716">;
def AUTIB1716 : SystemNoOperands<0b110, "autib1716">;
}
let Uses = [LR], Defs = [LR], CRm = 0b0000 in {
def XPACLRI : SystemNoOperands<0b111, "xpaclri">;
}
// These pointer authentication isntructions require armv8.3a
let Predicates = [HasV8_3a] in {
// v8.3a Pointer Authentication
let Uses = [LR], Defs = [LR] in {
def PACIAZ : SystemNoOperands<0b000, "paciaz">;
def PACIBZ : SystemNoOperands<0b010, "pacibz">;
def AUTIAZ : SystemNoOperands<0b100, "autiaz">;
def AUTIBZ : SystemNoOperands<0b110, "autibz">;
}
let Uses = [LR, SP], Defs = [LR] in {
def PACIASP : SystemNoOperands<0b001, "paciasp">;
def PACIBSP : SystemNoOperands<0b011, "pacibsp">;
def AUTIASP : SystemNoOperands<0b101, "autiasp">;
def AUTIBSP : SystemNoOperands<0b111, "autibsp">;
}
let Uses = [X16, X17], Defs = [X17], CRm = 0b0001 in {
def PACIA1716 : SystemNoOperands<0b000, "pacia1716">;
def PACIB1716 : SystemNoOperands<0b010, "pacib1716">;
def AUTIA1716 : SystemNoOperands<0b100, "autia1716">;
def AUTIB1716 : SystemNoOperands<0b110, "autib1716">;
}
let Uses = [LR], Defs = [LR], CRm = 0b0000 in {
def XPACLRI : SystemNoOperands<0b111, "xpaclri">;
}
multiclass SignAuth<bits<3> prefix, bits<3> prefix_z, string asm> {
def IA : SignAuthOneData<prefix, 0b00, !strconcat(asm, "ia")>;
def IB : SignAuthOneData<prefix, 0b01, !strconcat(asm, "ib")>;
@ -570,7 +573,7 @@ let Predicates = [HasV8_3a] in {
def BLRAAZ : AuthOneOperand<0b001, 0, "blraaz">;
def BLRABZ : AuthOneOperand<0b001, 1, "blrabz">;
let isReturn = 1 in {
let isReturn = 1, isTerminator = 1, isBarrier = 1 in {
def RETAA : AuthReturn<0b010, 0, "retaa">;
def RETAB : AuthReturn<0b010, 1, "retab">;
def ERETAA : AuthReturn<0b100, 0, "eretaa">;

26
test/MC/AArch64/armv8.3a-signed-pointer.s
View File

@ -70,43 +70,43 @@
paciasp
// CHECK: paciasp // encoding: [0x3f,0x23,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
autiasp
// CHECK: autiasp // encoding: [0xbf,0x23,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
paciaz
// CHECK: paciaz // encoding: [0x1f,0x23,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
autiaz
// CHECK: autiaz // encoding: [0x9f,0x23,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
pacia1716
// CHECK: pacia1716 // encoding: [0x1f,0x21,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
autia1716
// CHECK: autia1716 // encoding: [0x9f,0x21,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
pacibsp
// CHECK: pacibsp // encoding: [0x7f,0x23,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
autibsp
// CHECK: autibsp // encoding: [0xff,0x23,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
pacibz
// CHECK: pacibz // encoding: [0x5f,0x23,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
autibz
// CHECK: autibz // encoding: [0xdf,0x23,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
pacib1716
// CHECK: pacib1716 // encoding: [0x5f,0x21,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
autib1716
// CHECK: autib1716 // encoding: [0xdf,0x21,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
xpaclri
// CHECK: xpaclri // encoding: [0xff,0x20,0x03,0xd5]
// CHECK-REQ: error: instruction requires: armv8.3a
// CHECK-REQ-NOT: error: instruction requires: armv8.3a
pacia x0, x1
// CHECK: pacia x0, x1 // encoding: [0x20,0x00,0xc1,0xda]