Move ring0 package.

This allows the package to serve as a general purpose ring0 support package, as
opposed to being bound to specific sentry platforms.

Updates #5039

PiperOrigin-RevId: 355220044

1 files changed, 180 insertions, 0 deletions

diff --git a/pkg/ring0/lib_arm64.s b/pkg/ring0/lib_arm64.s
new file mode 100644
index 000000000..e39b32841
--- /dev/null
+++ b/pkg/ring0/lib_arm64.s
@@ -0,0 +1,180 @@
+// Copyright 2019 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "funcdata.h"
+#include "textflag.h"
+
+#define TLBI_ASID_SHIFT		48
+
+TEXT ·FlushTlbByVA(SB),NOSPLIT,$0-8
+	MOVD addr+0(FP), R1
+	DSB $10                 // dsb(ishst)
+	WORD $0xd50883a1        // tlbi vale1is, x1
+	DSB $11                 // dsb(ish)
+	RET
+
+TEXT ·FlushTlbByASID(SB),NOSPLIT,$0-8
+	MOVD asid+0(FP), R1
+	LSL $TLBI_ASID_SHIFT, R1, R1
+	DSB $10                 // dsb(ishst)
+	WORD $0xd5088341        // tlbi aside1is, x1
+	DSB $11                 // dsb(ish)
+	RET
+
+TEXT ·LocalFlushTlbAll(SB),NOSPLIT,$0
+	DSB $6			// dsb(nshst)
+	WORD $0xd508871f	// __tlbi(vmalle1)
+	DSB $7			// dsb(nsh)
+	ISB $15
+	RET
+
+TEXT ·FlushTlbAll(SB),NOSPLIT,$0
+	DSB $10			// dsb(ishst)
+	WORD $0xd508831f	// __tlbi(vmalle1is)
+	DSB $11			// dsb(ish)
+	ISB $15
+	RET
+
+TEXT ·CPACREL1(SB),NOSPLIT,$0-8
+	WORD $0xd5381041 	// MRS CPACR_EL1, R1
+	MOVD R1, ret+0(FP)
+	RET
+
+TEXT ·GetFPCR(SB),NOSPLIT,$0-8
+	MOVD FPCR, R1
+	MOVD R1, ret+0(FP)
+	RET
+
+TEXT ·GetFPSR(SB),NOSPLIT,$0-8
+	MOVD FPSR, R1
+	MOVD R1, ret+0(FP)
+	RET
+
+TEXT ·SetFPCR(SB),NOSPLIT,$0-8
+	MOVD addr+0(FP), R1
+	MOVD R1, FPCR
+	RET
+
+TEXT ·SetFPSR(SB),NOSPLIT,$0-8
+	MOVD addr+0(FP), R1
+	MOVD R1, FPSR
+	RET
+
+TEXT ·SaveVRegs(SB),NOSPLIT,$0-8
+	MOVD addr+0(FP), R0
+
+	// Skip aarch64_ctx, fpsr, fpcr.
+	ADD $16, R0, R0
+
+	WORD $0xad000400       //  stp  q0, q1, [x0]
+	WORD $0xad010c02       //  stp  q2, q3, [x0, #32]
+	WORD $0xad021404       //  stp  q4, q5, [x0, #64]
+	WORD $0xad031c06       //  stp  q6, q7, [x0, #96]
+	WORD $0xad042408       //  stp  q8, q9, [x0, #128]
+	WORD $0xad052c0a       //  stp  q10, q11, [x0, #160]
+	WORD $0xad06340c       //  stp  q12, q13, [x0, #192]
+	WORD $0xad073c0e       //  stp  q14, q15, [x0, #224]
+	WORD $0xad084410       //  stp  q16, q17, [x0, #256]
+	WORD $0xad094c12       //  stp  q18, q19, [x0, #288]
+	WORD $0xad0a5414       //  stp  q20, q21, [x0, #320]
+	WORD $0xad0b5c16       //  stp  q22, q23, [x0, #352]
+	WORD $0xad0c6418       //  stp  q24, q25, [x0, #384]
+	WORD $0xad0d6c1a       //  stp  q26, q27, [x0, #416]
+	WORD $0xad0e741c       //  stp  q28, q29, [x0, #448]
+	WORD $0xad0f7c1e       //  stp  q30, q31, [x0, #480]
+
+	RET
+
+TEXT ·LoadVRegs(SB),NOSPLIT,$0-8
+	MOVD addr+0(FP), R0
+
+	// Skip aarch64_ctx, fpsr, fpcr.
+	ADD $16, R0, R0
+
+	WORD $0xad400400    // ldp  q0, q1, [x0]
+	WORD $0xad410c02    // ldp  q2, q3, [x0, #32]
+	WORD $0xad421404    // ldp  q4, q5, [x0, #64]
+	WORD $0xad431c06    // ldp  q6, q7, [x0, #96]
+	WORD $0xad442408    // ldp  q8, q9, [x0, #128]
+	WORD $0xad452c0a    // ldp  q10, q11, [x0, #160]
+	WORD $0xad46340c    // ldp  q12, q13, [x0, #192]
+	WORD $0xad473c0e    // ldp  q14, q15, [x0, #224]
+	WORD $0xad484410    // ldp  q16, q17, [x0, #256]
+	WORD $0xad494c12    // ldp  q18, q19, [x0, #288]
+	WORD $0xad4a5414    // ldp  q20, q21, [x0, #320]
+	WORD $0xad4b5c16    // ldp  q22, q23, [x0, #352]
+	WORD $0xad4c6418    // ldp  q24, q25, [x0, #384]
+	WORD $0xad4d6c1a    // ldp  q26, q27, [x0, #416]
+	WORD $0xad4e741c    // ldp  q28, q29, [x0, #448]
+	WORD $0xad4f7c1e    // ldp  q30, q31, [x0, #480]
+
+	RET
+
+TEXT ·LoadFloatingPoint(SB),NOSPLIT,$0-8
+	MOVD addr+0(FP), R0
+
+	MOVD 0(R0), R1
+	MOVD R1, FPSR
+	MOVD 8(R0), R1
+	MOVD R1, FPCR
+
+	ADD $16, R0, R0
+
+	WORD $0xad400400 	// ldp	q0, q1, [x0]
+	WORD $0xad410c02 	// ldp	q2, q3, [x0, #32]
+	WORD $0xad421404 	// ldp	q4, q5, [x0, #64]
+	WORD $0xad431c06 	// ldp	q6, q7, [x0, #96]
+	WORD $0xad442408 	// ldp	q8, q9, [x0, #128]
+	WORD $0xad452c0a 	// ldp	q10, q11, [x0, #160]
+	WORD $0xad46340c 	// ldp	q12, q13, [x0, #192]
+	WORD $0xad473c0e 	// ldp	q14, q15, [x0, #224]
+	WORD $0xad484410 	// ldp	q16, q17, [x0, #256]
+	WORD $0xad494c12 	// ldp	q18, q19, [x0, #288]
+	WORD $0xad4a5414 	// ldp	q20, q21, [x0, #320]
+	WORD $0xad4b5c16 	// ldp	q22, q23, [x0, #352]
+	WORD $0xad4c6418 	// ldp	q24, q25, [x0, #384]
+	WORD $0xad4d6c1a 	// ldp	q26, q27, [x0, #416]
+	WORD $0xad4e741c 	// ldp	q28, q29, [x0, #448]
+	WORD $0xad4f7c1e 	// ldp	q30, q31, [x0, #480]
+
+	RET
+
+TEXT ·SaveFloatingPoint(SB),NOSPLIT,$0-8
+	MOVD addr+0(FP), R0
+
+	MOVD FPSR, R1
+	MOVD R1, 0(R0)
+	MOVD FPCR, R1
+	MOVD R1, 8(R0)
+
+	ADD $16, R0, R0
+
+	WORD $0xad000400       //  stp	q0, q1, [x0]
+	WORD $0xad010c02       //  stp	q2, q3, [x0, #32]
+	WORD $0xad021404       //  stp	q4, q5, [x0, #64]
+	WORD $0xad031c06       //  stp	q6, q7, [x0, #96]
+	WORD $0xad042408       //  stp	q8, q9, [x0, #128]
+	WORD $0xad052c0a       //  stp	q10, q11, [x0, #160]
+	WORD $0xad06340c       //  stp	q12, q13, [x0, #192]
+	WORD $0xad073c0e       //  stp	q14, q15, [x0, #224]
+	WORD $0xad084410       //  stp	q16, q17, [x0, #256]
+	WORD $0xad094c12       //  stp	q18, q19, [x0, #288]
+	WORD $0xad0a5414       //  stp	q20, q21, [x0, #320]
+	WORD $0xad0b5c16       //  stp	q22, q23, [x0, #352]
+	WORD $0xad0c6418       //  stp	q24, q25, [x0, #384]
+	WORD $0xad0d6c1a       //  stp	q26, q27, [x0, #416]
+	WORD $0xad0e741c       //  stp	q28, q29, [x0, #448]
+	WORD $0xad0f7c1e       //  stp	q30, q31, [x0, #480]
+
+	RET