1 files changed, 498 insertions, 0 deletions
diff --git a/src/runtime/race_arm64.s b/src/runtime/race_arm64.s
new file mode 100644
index 0000000..c818345
--- /dev/null
+++ b/src/runtime/race_arm64.s
@@ -0,0 +1,498 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build race
+
+#include "go_asm.h"
+#include "funcdata.h"
+#include "textflag.h"
+#include "tls_arm64.h"
+#include "cgo/abi_arm64.h"
+
+// The following thunks allow calling the gcc-compiled race runtime directly
+// from Go code without going all the way through cgo.
+// First, it's much faster (up to 50% speedup for real Go programs).
+// Second, it eliminates race-related special cases from cgocall and scheduler.
+// Third, in long-term it will allow to remove cyclic runtime/race dependency on cmd/go.
+
+// A brief recap of the arm64 calling convention.
+// Arguments are passed in R0...R7, the rest is on stack.
+// Callee-saved registers are: R19...R28.
+// Temporary registers are: R9...R15
+// SP must be 16-byte aligned.
+
+// When calling racecalladdr, R9 is the call target address.
+
+// The race ctx, ThreadState *thr below, is passed in R0 and loaded in racecalladdr.
+
+// Darwin may return unaligned thread pointer. Align it. (See tls_arm64.s)
+// No-op on other OSes.
+#ifdef TLS_darwin
+#define TP_ALIGN	AND	$~7, R0
+#else
+#define TP_ALIGN
+#endif
+
+// Load g from TLS. (See tls_arm64.s)
+#define load_g \
+	MRS_TPIDR_R0 \
+	TP_ALIGN \
+	MOVD    runtime·tls_g(SB), R11 \
+	MOVD    (R0)(R11), g
+
+// func runtime·raceread(addr uintptr)
+// Called from instrumented code.
+// Defined as ABIInternal so as to avoid introducing a wrapper,
+// which would make caller's PC ineffective.
+TEXT	runtime·raceread<ABIInternal>(SB), NOSPLIT, $0-8
+	MOVD	R0, R1	// addr
+	MOVD	LR, R2
+	// void __tsan_read(ThreadState *thr, void *addr, void *pc);
+	MOVD	$__tsan_read(SB), R9
+	JMP	racecalladdr<>(SB)
+
+// func runtime·RaceRead(addr uintptr)
+TEXT	runtime·RaceRead(SB), NOSPLIT, $0-8
+	// This needs to be a tail call, because raceread reads caller pc.
+	JMP	runtime·raceread(SB)
+
+// func runtime·racereadpc(void *addr, void *callpc, void *pc)
+TEXT	runtime·racereadpc(SB), NOSPLIT, $0-24
+	MOVD	addr+0(FP), R1
+	MOVD	callpc+8(FP), R2
+	MOVD	pc+16(FP), R3
+	// void __tsan_read_pc(ThreadState *thr, void *addr, void *callpc, void *pc);
+	MOVD	$__tsan_read_pc(SB), R9
+	JMP	racecalladdr<>(SB)
+
+// func runtime·racewrite(addr uintptr)
+// Called from instrumented code.
+// Defined as ABIInternal so as to avoid introducing a wrapper,
+// which would make caller's PC ineffective.
+TEXT	runtime·racewrite<ABIInternal>(SB), NOSPLIT, $0-8
+	MOVD	R0, R1	// addr
+	MOVD	LR, R2
+	// void __tsan_write(ThreadState *thr, void *addr, void *pc);
+	MOVD	$__tsan_write(SB), R9
+	JMP	racecalladdr<>(SB)
+
+// func runtime·RaceWrite(addr uintptr)
+TEXT	runtime·RaceWrite(SB), NOSPLIT, $0-8
+	// This needs to be a tail call, because racewrite reads caller pc.
+	JMP	runtime·racewrite(SB)
+
+// func runtime·racewritepc(void *addr, void *callpc, void *pc)
+TEXT	runtime·racewritepc(SB), NOSPLIT, $0-24
+	MOVD	addr+0(FP), R1
+	MOVD	callpc+8(FP), R2
+	MOVD	pc+16(FP), R3
+	// void __tsan_write_pc(ThreadState *thr, void *addr, void *callpc, void *pc);
+	MOVD	$__tsan_write_pc(SB), R9
+	JMP	racecalladdr<>(SB)
+
+// func runtime·racereadrange(addr, size uintptr)
+// Called from instrumented code.
+// Defined as ABIInternal so as to avoid introducing a wrapper,
+// which would make caller's PC ineffective.
+TEXT	runtime·racereadrange<ABIInternal>(SB), NOSPLIT, $0-16
+	MOVD	R1, R2	// size
+	MOVD	R0, R1	// addr
+	MOVD	LR, R3
+	// void __tsan_read_range(ThreadState *thr, void *addr, uintptr size, void *pc);
+	MOVD	$__tsan_read_range(SB), R9
+	JMP	racecalladdr<>(SB)
+
+// func runtime·RaceReadRange(addr, size uintptr)
+TEXT	runtime·RaceReadRange(SB), NOSPLIT, $0-16
+	// This needs to be a tail call, because racereadrange reads caller pc.
+	JMP	runtime·racereadrange(SB)
+
+// func runtime·racereadrangepc1(void *addr, uintptr sz, void *pc)
+TEXT	runtime·racereadrangepc1(SB), NOSPLIT, $0-24
+	MOVD	addr+0(FP), R1
+	MOVD	size+8(FP), R2
+	MOVD	pc+16(FP), R3
+	ADD	$4, R3	// pc is function start, tsan wants return address.
+	// void __tsan_read_range(ThreadState *thr, void *addr, uintptr size, void *pc);
+	MOVD	$__tsan_read_range(SB), R9
+	JMP	racecalladdr<>(SB)
+
+// func runtime·racewriterange(addr, size uintptr)
+// Called from instrumented code.
+// Defined as ABIInternal so as to avoid introducing a wrapper,
+// which would make caller's PC ineffective.
+TEXT	runtime·racewriterange<ABIInternal>(SB), NOSPLIT, $0-16
+	MOVD	R1, R2	// size
+	MOVD	R0, R1	// addr
+	MOVD	LR, R3
+	// void __tsan_write_range(ThreadState *thr, void *addr, uintptr size, void *pc);
+	MOVD	$__tsan_write_range(SB), R9
+	JMP	racecalladdr<>(SB)
+
+// func runtime·RaceWriteRange(addr, size uintptr)
+TEXT	runtime·RaceWriteRange(SB), NOSPLIT, $0-16
+	// This needs to be a tail call, because racewriterange reads caller pc.
+	JMP	runtime·racewriterange(SB)
+
+// func runtime·racewriterangepc1(void *addr, uintptr sz, void *pc)
+TEXT	runtime·racewriterangepc1(SB), NOSPLIT, $0-24
+	MOVD	addr+0(FP), R1
+	MOVD	size+8(FP), R2
+	MOVD	pc+16(FP), R3
+	ADD	$4, R3	// pc is function start, tsan wants return address.
+	// void __tsan_write_range(ThreadState *thr, void *addr, uintptr size, void *pc);
+	MOVD	$__tsan_write_range(SB), R9
+	JMP	racecalladdr<>(SB)
+
+// If addr (R1) is out of range, do nothing.
+// Otherwise, setup goroutine context and invoke racecall. Other arguments already set.
+TEXT	racecalladdr<>(SB), NOSPLIT, $0-0
+	load_g
+	MOVD	g_racectx(g), R0
+	// Check that addr is within [arenastart, arenaend) or within [racedatastart, racedataend).
+	MOVD	runtime·racearenastart(SB), R10
+	CMP	R10, R1
+	BLT	data
+	MOVD	runtime·racearenaend(SB), R10
+	CMP	R10, R1
+	BLT	call
+data:
+	MOVD	runtime·racedatastart(SB), R10
+	CMP	R10, R1
+	BLT	ret
+	MOVD	runtime·racedataend(SB), R10
+	CMP	R10, R1
+	BGT	ret
+call:
+	JMP	racecall<>(SB)
+ret:
+	RET
+
+// func runtime·racefuncenter(pc uintptr)
+// Called from instrumented code.
+TEXT	runtime·racefuncenter<ABIInternal>(SB), NOSPLIT, $0-8
+	MOVD	R0, R9	// callpc
+	JMP	racefuncenter<>(SB)
+
+// Common code for racefuncenter
+// R9 = caller's return address
+TEXT	racefuncenter<>(SB), NOSPLIT, $0-0
+	load_g
+	MOVD	g_racectx(g), R0	// goroutine racectx
+	MOVD	R9, R1
+	// void __tsan_func_enter(ThreadState *thr, void *pc);
+	MOVD	$__tsan_func_enter(SB), R9
+	BL	racecall<>(SB)
+	RET
+
+// func runtime·racefuncexit()
+// Called from instrumented code.
+TEXT	runtime·racefuncexit<ABIInternal>(SB), NOSPLIT, $0-0
+	load_g
+	MOVD	g_racectx(g), R0	// race context
+	// void __tsan_func_exit(ThreadState *thr);
+	MOVD	$__tsan_func_exit(SB), R9
+	JMP	racecall<>(SB)
+
+// Atomic operations for sync/atomic package.
+// R3 = addr of arguments passed to this function, it can
+// be fetched at 40(RSP) in racecallatomic after two times BL
+// R0, R1, R2 set in racecallatomic
+
+// Load
+TEXT	sync∕atomic·LoadInt32(SB), NOSPLIT, $0-12
+	GO_ARGS
+	MOVD	$__tsan_go_atomic32_load(SB), R9
+	BL	racecallatomic<>(SB)
+	RET
+
+TEXT	sync∕atomic·LoadInt64(SB), NOSPLIT, $0-16
+	GO_ARGS
+	MOVD	$__tsan_go_atomic64_load(SB), R9
+	BL	racecallatomic<>(SB)
+	RET
+
+TEXT	sync∕atomic·LoadUint32(SB), NOSPLIT, $0-12
+	GO_ARGS
+	JMP	sync∕atomic·LoadInt32(SB)
+
+TEXT	sync∕atomic·LoadUint64(SB), NOSPLIT, $0-16
+	GO_ARGS
+	JMP	sync∕atomic·LoadInt64(SB)
+
+TEXT	sync∕atomic·LoadUintptr(SB), NOSPLIT, $0-16
+	GO_ARGS
+	JMP	sync∕atomic·LoadInt64(SB)
+
+TEXT	sync∕atomic·LoadPointer(SB), NOSPLIT, $0-16
+	GO_ARGS
+	JMP	sync∕atomic·LoadInt64(SB)
+
+// Store
+TEXT	sync∕atomic·StoreInt32(SB), NOSPLIT, $0-12
+	GO_ARGS
+	MOVD	$__tsan_go_atomic32_store(SB), R9
+	BL	racecallatomic<>(SB)
+	RET
+
+TEXT	sync∕atomic·StoreInt64(SB), NOSPLIT, $0-16
+	GO_ARGS
+	MOVD	$__tsan_go_atomic64_store(SB), R9
+	BL	racecallatomic<>(SB)
+	RET
+
+TEXT	sync∕atomic·StoreUint32(SB), NOSPLIT, $0-12
+	GO_ARGS
+	JMP	sync∕atomic·StoreInt32(SB)
+
+TEXT	sync∕atomic·StoreUint64(SB), NOSPLIT, $0-16
+	GO_ARGS
+	JMP	sync∕atomic·StoreInt64(SB)
+
+TEXT	sync∕atomic·StoreUintptr(SB), NOSPLIT, $0-16
+	GO_ARGS
+	JMP	sync∕atomic·StoreInt64(SB)
+
+// Swap
+TEXT	sync∕atomic·SwapInt32(SB), NOSPLIT, $0-20
+	GO_ARGS
+	MOVD	$__tsan_go_atomic32_exchange(SB), R9
+	BL	racecallatomic<>(SB)
+	RET
+
+TEXT	sync∕atomic·SwapInt64(SB), NOSPLIT, $0-24
+	GO_ARGS
+	MOVD	$__tsan_go_atomic64_exchange(SB), R9
+	BL	racecallatomic<>(SB)
+	RET
+
+TEXT	sync∕atomic·SwapUint32(SB), NOSPLIT, $0-20
+	GO_ARGS
+	JMP	sync∕atomic·SwapInt32(SB)
+
+TEXT	sync∕atomic·SwapUint64(SB), NOSPLIT, $0-24
+	GO_ARGS
+	JMP	sync∕atomic·SwapInt64(SB)
+
+TEXT	sync∕atomic·SwapUintptr(SB), NOSPLIT, $0-24
+	GO_ARGS
+	JMP	sync∕atomic·SwapInt64(SB)
+
+// Add
+TEXT	sync∕atomic·AddInt32(SB), NOSPLIT, $0-20
+	GO_ARGS
+	MOVD	$__tsan_go_atomic32_fetch_add(SB), R9
+	BL	racecallatomic<>(SB)
+	MOVW	add+8(FP), R0	// convert fetch_add to add_fetch
+	MOVW	ret+16(FP), R1
+	ADD	R0, R1, R0
+	MOVW	R0, ret+16(FP)
+	RET
+
+TEXT	sync∕atomic·AddInt64(SB), NOSPLIT, $0-24
+	GO_ARGS
+	MOVD	$__tsan_go_atomic64_fetch_add(SB), R9
+	BL	racecallatomic<>(SB)
+	MOVD	add+8(FP), R0	// convert fetch_add to add_fetch
+	MOVD	ret+16(FP), R1
+	ADD	R0, R1, R0
+	MOVD	R0, ret+16(FP)
+	RET
+
+TEXT	sync∕atomic·AddUint32(SB), NOSPLIT, $0-20
+	GO_ARGS
+	JMP	sync∕atomic·AddInt32(SB)
+
+TEXT	sync∕atomic·AddUint64(SB), NOSPLIT, $0-24
+	GO_ARGS
+	JMP	sync∕atomic·AddInt64(SB)
+
+TEXT	sync∕atomic·AddUintptr(SB), NOSPLIT, $0-24
+	GO_ARGS
+	JMP	sync∕atomic·AddInt64(SB)
+
+// CompareAndSwap
+TEXT	sync∕atomic·CompareAndSwapInt32(SB), NOSPLIT, $0-17
+	GO_ARGS
+	MOVD	$__tsan_go_atomic32_compare_exchange(SB), R9
+	BL	racecallatomic<>(SB)
+	RET
+
+TEXT	sync∕atomic·CompareAndSwapInt64(SB), NOSPLIT, $0-25
+	GO_ARGS
+	MOVD	$__tsan_go_atomic64_compare_exchange(SB), R9
+	BL	racecallatomic<>(SB)
+	RET
+
+TEXT	sync∕atomic·CompareAndSwapUint32(SB), NOSPLIT, $0-17
+	GO_ARGS
+	JMP	sync∕atomic·CompareAndSwapInt32(SB)
+
+TEXT	sync∕atomic·CompareAndSwapUint64(SB), NOSPLIT, $0-25
+	GO_ARGS
+	JMP	sync∕atomic·CompareAndSwapInt64(SB)
+
+TEXT	sync∕atomic·CompareAndSwapUintptr(SB), NOSPLIT, $0-25
+	GO_ARGS
+	JMP	sync∕atomic·CompareAndSwapInt64(SB)
+
+// Generic atomic operation implementation.
+// R9 = addr of target function
+TEXT	racecallatomic<>(SB), NOSPLIT, $0
+	// Set up these registers
+	// R0 = *ThreadState
+	// R1 = caller pc
+	// R2 = pc
+	// R3 = addr of incoming arg list
+
+	// Trigger SIGSEGV early.
+	MOVD	40(RSP), R3	// 1st arg is addr. after two times BL, get it at 40(RSP)
+	MOVB	(R3), R13	// segv here if addr is bad
+	// Check that addr is within [arenastart, arenaend) or within [racedatastart, racedataend).
+	MOVD	runtime·racearenastart(SB), R10
+	CMP	R10, R3
+	BLT	racecallatomic_data
+	MOVD	runtime·racearenaend(SB), R10
+	CMP	R10, R3
+	BLT	racecallatomic_ok
+racecallatomic_data:
+	MOVD	runtime·racedatastart(SB), R10
+	CMP	R10, R3
+	BLT	racecallatomic_ignore
+	MOVD	runtime·racedataend(SB), R10
+	CMP	R10, R3
+	BGE	racecallatomic_ignore
+racecallatomic_ok:
+	// Addr is within the good range, call the atomic function.
+	load_g
+	MOVD	g_racectx(g), R0	// goroutine context
+	MOVD	16(RSP), R1	// caller pc
+	MOVD	R9, R2	// pc
+	ADD	$40, RSP, R3
+	JMP	racecall<>(SB)	// does not return
+racecallatomic_ignore:
+	// Addr is outside the good range.
+	// Call __tsan_go_ignore_sync_begin to ignore synchronization during the atomic op.
+	// An attempt to synchronize on the address would cause crash.
+	MOVD	R9, R21	// remember the original function
+	MOVD	$__tsan_go_ignore_sync_begin(SB), R9
+	load_g
+	MOVD	g_racectx(g), R0	// goroutine context
+	BL	racecall<>(SB)
+	MOVD	R21, R9	// restore the original function
+	// Call the atomic function.
+	// racecall will call LLVM race code which might clobber R28 (g)
+	load_g
+	MOVD	g_racectx(g), R0	// goroutine context
+	MOVD	16(RSP), R1	// caller pc
+	MOVD	R9, R2	// pc
+	ADD	$40, RSP, R3	// arguments
+	BL	racecall<>(SB)
+	// Call __tsan_go_ignore_sync_end.
+	MOVD	$__tsan_go_ignore_sync_end(SB), R9
+	MOVD	g_racectx(g), R0	// goroutine context
+	BL	racecall<>(SB)
+	RET
+
+// func runtime·racecall(void(*f)(...), ...)
+// Calls C function f from race runtime and passes up to 4 arguments to it.
+// The arguments are never heap-object-preserving pointers, so we pretend there are no arguments.
+TEXT	runtime·racecall(SB), NOSPLIT, $0-0
+	MOVD	fn+0(FP), R9
+	MOVD	arg0+8(FP), R0
+	MOVD	arg1+16(FP), R1
+	MOVD	arg2+24(FP), R2
+	MOVD	arg3+32(FP), R3
+	JMP	racecall<>(SB)
+
+// Switches SP to g0 stack and calls (R9). Arguments already set.
+// Clobbers R19, R20.
+TEXT	racecall<>(SB), NOSPLIT|NOFRAME, $0-0
+	MOVD	g_m(g), R10
+	// Switch to g0 stack.
+	MOVD	RSP, R19	// callee-saved, preserved across the CALL
+	MOVD	R30, R20	// callee-saved, preserved across the CALL
+	MOVD	m_g0(R10), R11
+	CMP	R11, g
+	BEQ	call	// already on g0
+	MOVD	(g_sched+gobuf_sp)(R11), R12
+	MOVD	R12, RSP
+call:
+	BL	R9
+	MOVD	R19, RSP
+	JMP	(R20)
+
+// C->Go callback thunk that allows to call runtime·racesymbolize from C code.
+// Direct Go->C race call has only switched SP, finish g->g0 switch by setting correct g.
+// The overall effect of Go->C->Go call chain is similar to that of mcall.
+// R0 contains command code. R1 contains command-specific context.
+// See racecallback for command codes.
+TEXT	runtime·racecallbackthunk(SB), NOSPLIT|NOFRAME, $0
+	// Handle command raceGetProcCmd (0) here.
+	// First, code below assumes that we are on curg, while raceGetProcCmd
+	// can be executed on g0. Second, it is called frequently, so will
+	// benefit from this fast path.
+	CBNZ	R0, rest
+	MOVD	g, R13
+#ifdef TLS_darwin
+	MOVD	R27, R12 // save R27 a.k.a. REGTMP (callee-save in C). load_g clobbers it
+#endif
+	load_g
+#ifdef TLS_darwin
+	MOVD	R12, R27
+#endif
+	MOVD	g_m(g), R0
+	MOVD	m_p(R0), R0
+	MOVD	p_raceprocctx(R0), R0
+	MOVD	R0, (R1)
+	MOVD	R13, g
+	JMP	(LR)
+rest:
+	// Save callee-saved registers (Go code won't respect that).
+	// 8(RSP) and 16(RSP) are for args passed through racecallback
+	SUB	$176, RSP
+	MOVD	LR, 0(RSP)
+
+	SAVE_R19_TO_R28(8*3)
+	SAVE_F8_TO_F15(8*13)
+	MOVD	R29, (8*21)(RSP)
+	// Set g = g0.
+	// load_g will clobber R0, Save R0
+	MOVD	R0, R13
+	load_g
+	// restore R0
+	MOVD	R13, R0
+	MOVD	g_m(g), R13
+	MOVD	m_g0(R13), R14
+	CMP	R14, g
+	BEQ	noswitch	// branch if already on g0
+	MOVD	R14, g
+
+	MOVD	R0, 8(RSP)	// func arg
+	MOVD	R1, 16(RSP)	// func arg
+	BL	runtime·racecallback(SB)
+
+	// All registers are smashed after Go code, reload.
+	MOVD	g_m(g), R13
+	MOVD	m_curg(R13), g	// g = m->curg
+ret:
+	// Restore callee-saved registers.
+	MOVD	0(RSP), LR
+	MOVD	(8*21)(RSP), R29
+	RESTORE_F8_TO_F15(8*13)
+	RESTORE_R19_TO_R28(8*3)
+	ADD	$176, RSP
+	JMP	(LR)
+
+noswitch:
+	// already on g0
+	MOVD	R0, 8(RSP)	// func arg
+	MOVD	R1, 16(RSP)	// func arg
+	BL	runtime·racecallback(SB)
+	JMP	ret
+
+#ifndef TLSG_IS_VARIABLE
+// tls_g, g value for each thread in TLS
+GLOBL runtime·tls_g+0(SB), TLSBSS+DUPOK, $8
+#endif