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[AArch64] Define ETE and TRBE system registers 

Embedded Trace Extension and Trace Buffer Extension are optional
future architecture extensions.
(cf. https://developer.arm.com/architectures/cpu-architecture/a-profile/exploration-tools)

Their system registers are documented here:
https://developer.arm.com/docs/ddi0601/a

ETE shares register names with ETM. One exception is the ETE
TRCEXTINSELR0 register, which has the same encoding as the ETM
TRCEXTINSELR register (but different semantics). This patch treats
them as aliases: the assembler will accept both names, emitting
identical encoding, and the disassembler will keep disassembling
to TRCEXRINSELR.

Differential Revision: https://reviews.llvm.org/D63707

llvm-svn: 367093
This commit is contained in:
Momchil Velikov 2019-07-26 09:19:08 +00:00
parent d0164fc525
commit 898d953693
9 changed files with 193 additions and 1 deletions
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15
llvm/lib/Target/AArch64/AArch64.td
View File

@ -345,6 +345,13 @@ def FeatureRandGen : SubtargetFeature<"rand", "HasRandGen",
def FeatureMTE : SubtargetFeature<"mte", "HasMTE",
"true", "Enable Memory Tagging Extension" >;
def FeatureTRBE : SubtargetFeature<"trbe", "HasTRBE",
"true", "Enable Trace Buffer Extension">;
def FeatureETE : SubtargetFeature<"ete", "HasETE",
"true", "Enable Embedded Trace Extension",
[FeatureTRBE]>;
//===----------------------------------------------------------------------===//
// Architectures.
//
@ -772,7 +779,13 @@ def : ProcessorModel<"generic", NoSchedModel, [
FeatureFuseAES,
FeatureNEON,
FeaturePerfMon,
FeaturePostRAScheduler
FeaturePostRAScheduler,
// ETE and TRBE are future architecture extensions. We temporariliy enable them
// by default for users targeting generic AArch64, until it is decided in which
// armv8.x-a architecture revision they will end up. The extensions do not
// affect code generated by the compiler and can be used only by explicitly
// mentioning the new system register names in assembly.
FeatureETE
]>;
def : ProcessorModel<"cortex-a35", CortexA53Model, [ProcA35]>;

4
llvm/lib/Target/AArch64/AArch64InstrInfo.td
View File

@ -133,6 +133,10 @@ def HasBTI : Predicate<"Subtarget->hasBTI()">,
AssemblerPredicate<"FeatureBranchTargetId", "bti">;
def HasMTE : Predicate<"Subtarget->hasMTE()">,
AssemblerPredicate<"FeatureMTE", "mte">;
def HasETE : Predicate<"Subtarget->hasETE()">,
AssemblerPredicate<"FeatureETE", "ete">;
def HasTRBE : Predicate<"Subtarget->hasTRBE()">,
AssemblerPredicate<"FeatureTRBE", "trbe">;
def IsLE : Predicate<"Subtarget->isLittleEndian()">;
def IsBE : Predicate<"!Subtarget->isLittleEndian()">;
def IsWindows : Predicate<"Subtarget->isTargetWindows()">;

4
llvm/lib/Target/AArch64/AArch64Subtarget.h
View File

@ -144,6 +144,10 @@ protected:
bool HasSVE2SHA3 = false;
bool HasSVE2BitPerm = false;
// Future architecture extensions.
bool HasETE = false;
bool HasTRBE = false;
// HasZeroCycleRegMove - Has zero-cycle register mov instructions.
bool HasZeroCycleRegMove = false;

23
llvm/lib/Target/AArch64/AArch64SystemOperands.td
View File

@ -1460,6 +1460,29 @@ def : RWSysReg<"TFSRE0_EL1", 0b11, 0b000, 0b0110, 0b0110, 0b001>;
def : ROSysReg<"GMID_EL1", 0b11, 0b001, 0b0000, 0b0000, 0b100>;
} // HasMTE
// Embedded Trace Extension R/W System registers
let Requires = [{ {AArch64::FeatureETE} }] in {
// Name Op0 Op1 CRn CRm Op2
def : RWSysReg<"TRCRSR", 0b10, 0b001, 0b0000, 0b1010, 0b000>;
// TRCEXTINSELR0 has the same encoding as ETM TRCEXTINSELR
def : RWSysReg<"TRCEXTINSELR0", 0b10, 0b001, 0b0000, 0b1000, 0b100>;
def : RWSysReg<"TRCEXTINSELR1", 0b10, 0b001, 0b0000, 0b1001, 0b100>;
def : RWSysReg<"TRCEXTINSELR2", 0b10, 0b001, 0b0000, 0b1010, 0b100>;
def : RWSysReg<"TRCEXTINSELR3", 0b10, 0b001, 0b0000, 0b1011, 0b100>;
} // FeatureETE
// Trace Buffer Extension System registers
let Requires = [{ {AArch64::FeatureTRBE} }] in {
// Name Op0 Op1 CRn CRm Op2
def : RWSysReg<"TRBLIMITR_EL1", 0b11, 0b000, 0b1001, 0b1011, 0b000>;
def : RWSysReg<"TRBPTR_EL1", 0b11, 0b000, 0b1001, 0b1011, 0b001>;
def : RWSysReg<"TRBBASER_EL1", 0b11, 0b000, 0b1001, 0b1011, 0b010>;
def : RWSysReg<"TRBSR_EL1", 0b11, 0b000, 0b1001, 0b1011, 0b011>;
def : RWSysReg<"TRBMAR_EL1", 0b11, 0b000, 0b1001, 0b1011, 0b100>;
def : RWSysReg<"TRBTRG_EL1", 0b11, 0b000, 0b1001, 0b1011, 0b110>;
def : ROSysReg<"TRBIDR_EL1", 0b11, 0b000, 0b1001, 0b1011, 0b111>;
} // FeatureTRBE
// Cyclone specific system registers
// Op0 Op1 CRn CRm Op2
let Requires = [{ {AArch64::ProcCyclone} }] in

33
llvm/test/MC/AArch64/ete-sysregs.s Normal file
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@ -0,0 +1,33 @@
// ETE System registers
//
// RUN: llvm-mc -triple aarch64 -show-encoding < %s | FileCheck %s
// Read from system register
mrs x0, TRCRSR
mrs x0, TRCEXTINSELR
mrs x0, TRCEXTINSELR0
mrs x0, TRCEXTINSELR1
mrs x0, TRCEXTINSELR2
mrs x0, TRCEXTINSELR3
// CHECK: mrs x0, TRCRSR // encoding: [0x00,0x0a,0x31,0xd5]
// CHECK: mrs x0, TRCEXTINSELR // encoding: [0x80,0x08,0x31,0xd5]
// CHECK: mrs x0, TRCEXTINSELR // encoding: [0x80,0x08,0x31,0xd5]
// CHECK: mrs x0, TRCEXTINSELR1 // encoding: [0x80,0x09,0x31,0xd5]
// CHECK: mrs x0, TRCEXTINSELR2 // encoding: [0x80,0x0a,0x31,0xd5]
// CHECK: mrs x0, TRCEXTINSELR3 // encoding: [0x80,0x0b,0x31,0xd5]
// Write to system register
msr TRCRSR, x0
msr TRCEXTINSELR, x0
msr TRCEXTINSELR0, x0
msr TRCEXTINSELR1, x0
msr TRCEXTINSELR2, x0
msr TRCEXTINSELR3, x0
// CHECK: msr TRCRSR, x0 // encoding: [0x00,0x0a,0x11,0xd5]
// CHECK: msr TRCEXTINSELR, x0 // encoding: [0x80,0x08,0x11,0xd5]
// CHECK: msr TRCEXTINSELR, x0 // encoding: [0x80,0x08,0x11,0xd5]
// CHECK: msr TRCEXTINSELR1, x0 // encoding: [0x80,0x09,0x11,0xd5]
// CHECK: msr TRCEXTINSELR2, x0 // encoding: [0x80,0x0a,0x11,0xd5]
// CHECK: msr TRCEXTINSELR3, x0 // encoding: [0x80,0x0b,0x11,0xd5]

9
llvm/test/MC/AArch64/trbe-sysreg-diag.s Normal file
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@ -0,0 +1,9 @@
// TRBE RO System register
//
// RUN: not llvm-mc -triple aarch64 -show-encoding < %s 2>&1 | FileCheck %s
// Write to system register
msr TRBIDR_EL1, x0
// CHECK: expected writable system register or pstate
// CHECK-NEXT: msr TRBIDR_EL1, x0

35
llvm/test/MC/AArch64/trbe-sysreg.s Normal file
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@ -0,0 +1,35 @@
// TRBE System registers
//
// RUN: llvm-mc -triple aarch64 -show-encoding < %s | FileCheck %s
// Read from system register
mrs x0, TRBLIMITR_EL1
mrs x0, TRBPTR_EL1
mrs x0, TRBBASER_EL1
mrs x0, TRBSR_EL1
mrs x0, TRBMAR_EL1
mrs x0, TRBTRG_EL1
mrs x0, TRBIDR_EL1
// CHECK: mrs x0, TRBLIMITR_EL1 // encoding: [0x00,0x9b,0x38,0xd5]
// CHECK: mrs x0, TRBPTR_EL1 // encoding: [0x20,0x9b,0x38,0xd5]
// CHECK: mrs x0, TRBBASER_EL1 // encoding: [0x40,0x9b,0x38,0xd5]
// CHECK: mrs x0, TRBSR_EL1 // encoding: [0x60,0x9b,0x38,0xd5]
// CHECK: mrs x0, TRBMAR_EL1 // encoding: [0x80,0x9b,0x38,0xd5]
// CHECK: mrs x0, TRBTRG_EL1 // encoding: [0xc0,0x9b,0x38,0xd5]
// CHECK: mrs x0, TRBIDR_EL1 // encoding: [0xe0,0x9b,0x38,0xd5]
// Write to system register
msr TRBLIMITR_EL1, x0
msr TRBPTR_EL1, x0
msr TRBBASER_EL1, x0
msr TRBSR_EL1, x0
msr TRBMAR_EL1, x0
msr TRBTRG_EL1, x0
// CHECK: msr TRBLIMITR_EL1, x0 // encoding: [0x00,0x9b,0x18,0xd5]
// CHECK: msr TRBPTR_EL1, x0 // encoding: [0x20,0x9b,0x18,0xd5]
// CHECK: msr TRBBASER_EL1, x0 // encoding: [0x40,0x9b,0x18,0xd5]
// CHECK: msr TRBSR_EL1, x0 // encoding: [0x60,0x9b,0x18,0xd5]
// CHECK: msr TRBMAR_EL1, x0 // encoding: [0x80,0x9b,0x18,0xd5]
// CHECK: msr TRBTRG_EL1, x0 // encoding: [0xc0,0x9b,0x18,0xd5]

36
llvm/test/MC/Disassembler/AArch64/ete.txt Normal file
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@ -0,0 +1,36 @@
# ETE System registers
#
# RUN: llvm-mc -triple aarch64 -disassemble < %s | FileCheck %s
# Read from system register
[0x00,0x0a,0x31,0xd5]
# CHECK: mrs x0, TRCRSR
[0x80,0x08,0x31,0xd5]
# CHECK: mrs x0, TRCEXTINSELR
[0x80,0x09,0x31,0xd5]
# CHECK: mrs x0, TRCEXTINSELR1
[0x80,0x0a,0x31,0xd5]
# CHECK: mrs x0, TRCEXTINSELR2
[0x80,0x0b,0x31,0xd5]
# CHECK: mrs x0, TRCEXTINSELR3
# Write to system register
[0x00,0x0a,0x11,0xd5]
# CHECK: msr TRCRSR, x0
[0x80,0x08,0x11,0xd5]
# CHECK: msr TRCEXTINSELR, x0
[0x80,0x09,0x11,0xd5]
# CHECK: msr TRCEXTINSELR1, x0
[0x80,0x0a,0x11,0xd5]
# CHECK: msr TRCEXTINSELR2, x0
[0x80,0x0b,0x11,0xd5]
# CHECK: msr TRCEXTINSELR3, x0

35
llvm/test/MC/Disassembler/AArch64/trbe.txt Normal file
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@ -0,0 +1,35 @@
# TRBE System registers
#
# RUN: llvm-mc -triple aarch64 -disassemble < %s | FileCheck %s
# Read from system register
[0x00,0x9b,0x38,0xd5]
[0x20,0x9b,0x38,0xd5]
[0x40,0x9b,0x38,0xd5]
[0x60,0x9b,0x38,0xd5]
[0x80,0x9b,0x38,0xd5]
[0xc0,0x9b,0x38,0xd5]
[0xe0,0x9b,0x38,0xd5]
# CHECK: mrs x0, TRBLIMITR_EL1
# CHECK: mrs x0, TRBPTR_EL1
# CHECK: mrs x0, TRBBASER_EL1
# CHECK: mrs x0, TRBSR_EL1
# CHECK: mrs x0, TRBMAR_EL1
# CHECK: mrs x0, TRBTRG_EL1
# CHECK: mrs x0, TRBIDR_EL1
# Write to system register
[0x00,0x9b,0x18,0xd5]
[0x20,0x9b,0x18,0xd5]
[0x40,0x9b,0x18,0xd5]
[0x60,0x9b,0x18,0xd5]
[0x80,0x9b,0x18,0xd5]
[0xc0,0x9b,0x18,0xd5]
# CHECK: msr TRBLIMITR_EL1, x0
# CHECK: msr TRBPTR_EL1, x0
# CHECK: msr TRBBASER_EL1, x0
# CHECK: msr TRBSR_EL1, x0
# CHECK: msr TRBMAR_EL1, x0
# CHECK: msr TRBTRG_EL1, x0