Merge pull request #2687 from lubinszARM:pr_tls_1

PiperOrigin-RevId: 312299234

pkg/sentry/platform/ring0/lib_arm64.go

@@ -38,6 +38,12 @@ func SaveVRegs(*byte)
 // LoadVRegs loads V0-V31 registers.
 func LoadVRegs(*byte)
 
+// GetTLS returns the value of TPIDR_EL0 register.
+func GetTLS() (value uint64)
+
+// SetTLS writes the TPIDR_EL0 value.
+func SetTLS(value uint64)
+
 // Init sets function pointers based on architectural features.
 //
 // This must be called prior to using ring0.

pkg/sentry/platform/ring0/lib_arm64.s

@@ -15,6 +15,16 @@
 #include "funcdata.h"
 #include "textflag.h"
 
+TEXT ·GetTLS(SB),NOSPLIT,$0-8
+	MRS TPIDR_EL0, R1
+	MOVD R1, ret+0(FP)
+	RET
+
+TEXT ·SetTLS(SB),NOSPLIT,$0-8
+	MOVD addr+0(FP), R1
+	MSR R1, TPIDR_EL0
+	RET
+
 TEXT ·CPACREL1(SB),NOSPLIT,$0-8
 	WORD $0xd5381041 	// MRS CPACR_EL1, R1
 	MOVD R1, ret+0(FP)