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Viewing File: race_arm64.s
// 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
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