// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build race
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#include "go_asm.h"
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#include "go_tls.h"
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#include "funcdata.h"
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#include "textflag.h"
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// The following functions allow calling the clang-compiled race runtime directly
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// from Go code without going all the way through cgo.
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// First, it's much faster (up to 50% speedup for real Go programs).
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// Second, it eliminates race-related special cases from cgocall and scheduler.
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// Third, in long-term it will allow to remove cyclic runtime/race dependency on cmd/go.
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// A brief recap of the ppc64le calling convention.
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// Arguments are passed in R3, R4, R5 ...
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// SP must be 16-byte aligned.
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// Note that for ppc64x, LLVM follows the standard ABI and
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// expects arguments in registers, so these functions move
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// the arguments from storage to the registers expected
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// by the ABI.
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// When calling from Go to Clang tsan code:
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// R3 is the 1st argument and is usually the ThreadState*
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// R4-? are the 2nd, 3rd, 4th, etc. arguments
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// When calling racecalladdr:
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// R8 is the call target address
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// The race ctx is passed in R3 and loaded in
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// racecalladdr.
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//
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// The sequence used to get the race ctx:
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// MOVD runtime·tls_g(SB), R10 // offset to TLS
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// MOVD 0(R13)(R10*1), g // R13=TLS for this thread, g = R30
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// MOVD g_racectx(g), R3 // racectx == ThreadState
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// func runtime·RaceRead(addr uintptr)
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// Called from instrumented Go code
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TEXT runtime·raceread(SB), NOSPLIT, $0-8
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MOVD addr+0(FP), R4
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MOVD LR, R5 // caller of this?
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// void __tsan_read(ThreadState *thr, void *addr, void *pc);
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MOVD $__tsan_read(SB), R8
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BR racecalladdr<>(SB)
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TEXT runtime·RaceRead(SB), NOSPLIT, $0-8
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BR runtime·raceread(SB)
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// void runtime·racereadpc(void *addr, void *callpc, void *pc)
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TEXT runtime·racereadpc(SB), NOSPLIT, $0-24
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MOVD addr+0(FP), R4
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MOVD callpc+8(FP), R5
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MOVD pc+16(FP), R6
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// void __tsan_read_pc(ThreadState *thr, void *addr, void *callpc, void *pc);
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MOVD $__tsan_read_pc(SB), R8
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BR racecalladdr<>(SB)
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// func runtime·RaceWrite(addr uintptr)
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// Called from instrumented Go code
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TEXT runtime·racewrite(SB), NOSPLIT, $0-8
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MOVD addr+0(FP), R4
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MOVD LR, R5 // caller has set LR via BL inst
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// void __tsan_write(ThreadState *thr, void *addr, void *pc);
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MOVD $__tsan_write(SB), R8
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BR racecalladdr<>(SB)
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TEXT runtime·RaceWrite(SB), NOSPLIT, $0-8
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JMP runtime·racewrite(SB)
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// void runtime·racewritepc(void *addr, void *callpc, void *pc)
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TEXT runtime·racewritepc(SB), NOSPLIT, $0-24
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MOVD addr+0(FP), R4
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MOVD callpc+8(FP), R5
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MOVD pc+16(FP), R6
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// void __tsan_write_pc(ThreadState *thr, void *addr, void *callpc, void *pc);
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MOVD $__tsan_write_pc(SB), R8
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BR racecalladdr<>(SB)
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// func runtime·RaceReadRange(addr, size uintptr)
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// Called from instrumented Go code.
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TEXT runtime·racereadrange(SB), NOSPLIT, $0-16
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MOVD addr+0(FP), R4
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MOVD size+8(FP), R5
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MOVD LR, R6
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// void __tsan_read_range(ThreadState *thr, void *addr, uintptr size, void *pc);
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MOVD $__tsan_read_range(SB), R8
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BR racecalladdr<>(SB)
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// void runtime·racereadrangepc1(void *addr, uintptr sz, void *pc)
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TEXT runtime·racereadrangepc1(SB), NOSPLIT, $0-24
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MOVD addr+0(FP), R4
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MOVD size+8(FP), R5
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MOVD pc+16(FP), R6
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ADD $4, R6 // tsan wants return addr
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// void __tsan_read_range(ThreadState *thr, void *addr, uintptr size, void *pc);
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MOVD $__tsan_read_range(SB), R8
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BR racecalladdr<>(SB)
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TEXT runtime·RaceReadRange(SB), NOSPLIT, $0-24
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BR runtime·racereadrange(SB)
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// func runtime·RaceWriteRange(addr, size uintptr)
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// Called from instrumented Go code.
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TEXT runtime·racewriterange(SB), NOSPLIT, $0-16
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MOVD addr+0(FP), R4
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MOVD size+8(FP), R5
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MOVD LR, R6
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// void __tsan_write_range(ThreadState *thr, void *addr, uintptr size, void *pc);
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MOVD $__tsan_write_range(SB), R8
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BR racecalladdr<>(SB)
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TEXT runtime·RaceWriteRange(SB), NOSPLIT, $0-16
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BR runtime·racewriterange(SB)
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// void runtime·racewriterangepc1(void *addr, uintptr sz, void *pc)
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// Called from instrumented Go code
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TEXT runtime·racewriterangepc1(SB), NOSPLIT, $0-24
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MOVD addr+0(FP), R4
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MOVD size+8(FP), R5
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MOVD pc+16(FP), R6
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ADD $4, R6 // add 4 to inst offset?
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// void __tsan_write_range(ThreadState *thr, void *addr, uintptr size, void *pc);
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MOVD $__tsan_write_range(SB), R8
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BR racecalladdr<>(SB)
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// Call a __tsan function from Go code.
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// R8 = tsan function address
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// R3 = *ThreadState a.k.a. g_racectx from g
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// R4 = addr passed to __tsan function
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//
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// Otherwise, setup goroutine context and invoke racecall. Other arguments already set.
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TEXT racecalladdr<>(SB), NOSPLIT, $0-0
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MOVD runtime·tls_g(SB), R10
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MOVD 0(R13)(R10*1), g
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MOVD g_racectx(g), R3 // goroutine context
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// Check that addr is within [arenastart, arenaend) or within [racedatastart, racedataend).
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MOVD runtime·racearenastart(SB), R9
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CMP R4, R9
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BLT data
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MOVD runtime·racearenaend(SB), R9
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CMP R4, R9
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BLT call
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data:
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MOVD runtime·racedatastart(SB), R9
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CMP R4, R9
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BLT ret
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MOVD runtime·racedataend(SB), R9
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CMP R4, R9
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BGT ret
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call:
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// Careful!! racecall will save LR on its
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// stack, which is OK as long as racecalladdr
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// doesn't change in a way that generates a stack.
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// racecall should return to the caller of
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// recalladdr.
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BR racecall<>(SB)
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ret:
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RET
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// func runtime·racefuncenterfp()
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// Called from instrumented Go code.
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// Like racefuncenter but doesn't pass an arg, uses the caller pc
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// from the first slot on the stack.
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TEXT runtime·racefuncenterfp(SB), NOSPLIT, $0-0
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MOVD 0(R1), R8
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BR racefuncenter<>(SB)
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// func runtime·racefuncenter(pc uintptr)
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// Called from instrumented Go code.
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// Not used now since gc/racewalk.go doesn't pass the
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// correct caller pc and racefuncenterfp can do it.
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TEXT runtime·racefuncenter(SB), NOSPLIT, $0-8
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MOVD callpc+0(FP), R8
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BR racefuncenter<>(SB)
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// Common code for racefuncenter/racefuncenterfp
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// R11 = caller's return address
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TEXT racefuncenter<>(SB), NOSPLIT, $0-0
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MOVD runtime·tls_g(SB), R10
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MOVD 0(R13)(R10*1), g
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MOVD g_racectx(g), R3 // goroutine racectx aka *ThreadState
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MOVD R8, R4 // caller pc set by caller in R8
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// void __tsan_func_enter(ThreadState *thr, void *pc);
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MOVD $__tsan_func_enter(SB), R8
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BR racecall<>(SB)
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RET
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// func runtime·racefuncexit()
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// Called from Go instrumented code.
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TEXT runtime·racefuncexit(SB), NOSPLIT, $0-0
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MOVD runtime·tls_g(SB), R10
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MOVD 0(R13)(R10*1), g
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MOVD g_racectx(g), R3 // goroutine racectx aka *ThreadState
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// void __tsan_func_exit(ThreadState *thr);
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MOVD $__tsan_func_exit(SB), R8
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BR racecall<>(SB)
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// Atomic operations for sync/atomic package.
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// Some use the __tsan versions instead
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// R6 = addr of arguments passed to this function
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// R3, R4, R5 set in racecallatomic
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// Load atomic in tsan
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TEXT sync∕atomic·LoadInt32(SB), NOSPLIT, $0-0
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// void __tsan_go_atomic32_load(ThreadState *thr, uptr cpc, uptr pc, u8 *a);
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MOVD $__tsan_go_atomic32_load(SB), R8
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ADD $32, R1, R6 // addr of caller's 1st arg
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BR racecallatomic<>(SB)
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RET
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TEXT sync∕atomic·LoadInt64(SB), NOSPLIT, $0-0
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// void __tsan_go_atomic64_load(ThreadState *thr, uptr cpc, uptr pc, u8 *a);
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MOVD $__tsan_go_atomic64_load(SB), R8
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ADD $32, R1, R6 // addr of caller's 1st arg
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BR racecallatomic<>(SB)
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RET
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TEXT sync∕atomic·LoadUint32(SB), NOSPLIT, $0-0
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BR sync∕atomic·LoadInt32(SB)
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TEXT sync∕atomic·LoadUint64(SB), NOSPLIT, $0-0
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BR sync∕atomic·LoadInt64(SB)
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TEXT sync∕atomic·LoadUintptr(SB), NOSPLIT, $0-0
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BR sync∕atomic·LoadInt64(SB)
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TEXT sync∕atomic·LoadPointer(SB), NOSPLIT, $0-0
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BR sync∕atomic·LoadInt64(SB)
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// Store atomic in tsan
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TEXT sync∕atomic·StoreInt32(SB), NOSPLIT, $0-0
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// void __tsan_go_atomic32_store(ThreadState *thr, uptr cpc, uptr pc, u8 *a);
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MOVD $__tsan_go_atomic32_store(SB), R8
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ADD $32, R1, R6 // addr of caller's 1st arg
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BR racecallatomic<>(SB)
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TEXT sync∕atomic·StoreInt64(SB), NOSPLIT, $0-0
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// void __tsan_go_atomic64_store(ThreadState *thr, uptr cpc, uptr pc, u8 *a);
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MOVD $__tsan_go_atomic64_store(SB), R8
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ADD $32, R1, R6 // addr of caller's 1st arg
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BR racecallatomic<>(SB)
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TEXT sync∕atomic·StoreUint32(SB), NOSPLIT, $0-0
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BR sync∕atomic·StoreInt32(SB)
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TEXT sync∕atomic·StoreUint64(SB), NOSPLIT, $0-0
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BR sync∕atomic·StoreInt64(SB)
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TEXT sync∕atomic·StoreUintptr(SB), NOSPLIT, $0-0
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BR sync∕atomic·StoreInt64(SB)
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// Swap in tsan
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TEXT sync∕atomic·SwapInt32(SB), NOSPLIT, $0-0
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// void __tsan_go_atomic32_exchange(ThreadState *thr, uptr cpc, uptr pc, u8 *a);
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MOVD $__tsan_go_atomic32_exchange(SB), R8
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ADD $32, R1, R6 // addr of caller's 1st arg
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BR racecallatomic<>(SB)
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TEXT sync∕atomic·SwapInt64(SB), NOSPLIT, $0-0
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// void __tsan_go_atomic64_exchange(ThreadState *thr, uptr cpc, uptr pc, u8 *a)
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MOVD $__tsan_go_atomic64_exchange(SB), R8
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ADD $32, R1, R6 // addr of caller's 1st arg
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BR racecallatomic<>(SB)
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TEXT sync∕atomic·SwapUint32(SB), NOSPLIT, $0-0
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BR sync∕atomic·SwapInt32(SB)
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TEXT sync∕atomic·SwapUint64(SB), NOSPLIT, $0-0
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BR sync∕atomic·SwapInt64(SB)
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TEXT sync∕atomic·SwapUintptr(SB), NOSPLIT, $0-0
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BR sync∕atomic·SwapInt64(SB)
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// Add atomic in tsan
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TEXT sync∕atomic·AddInt32(SB), NOSPLIT, $0-0
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// void __tsan_go_atomic32_fetch_add(ThreadState *thr, uptr cpc, uptr pc, u8 *a);
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MOVD $__tsan_go_atomic32_fetch_add(SB), R8
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ADD $64, R1, R6 // addr of caller's 1st arg
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BL racecallatomic<>(SB)
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// The tsan fetch_add result is not as expected by Go,
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// so the 'add' must be added to the result.
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MOVW add+8(FP), R3 // The tsa fetch_add does not return the
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MOVW ret+16(FP), R4 // result as expected by go, so fix it.
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ADD R3, R4, R3
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MOVW R3, ret+16(FP)
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RET
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TEXT sync∕atomic·AddInt64(SB), NOSPLIT, $0-0
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// void __tsan_go_atomic64_fetch_add(ThreadState *thr, uptr cpc, uptr pc, u8 *a);
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MOVD $__tsan_go_atomic64_fetch_add(SB), R8
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ADD $64, R1, R6 // addr of caller's 1st arg
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BL racecallatomic<>(SB)
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// The tsan fetch_add result is not as expected by Go,
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// so the 'add' must be added to the result.
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MOVD add+8(FP), R3
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MOVD ret+16(FP), R4
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ADD R3, R4, R3
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MOVD R3, ret+16(FP)
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RET
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TEXT sync∕atomic·AddUint32(SB), NOSPLIT, $0-0
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BR sync∕atomic·AddInt32(SB)
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TEXT sync∕atomic·AddUint64(SB), NOSPLIT, $0-0
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BR sync∕atomic·AddInt64(SB)
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TEXT sync∕atomic·AddUintptr(SB), NOSPLIT, $0-0
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BR sync∕atomic·AddInt64(SB)
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// CompareAndSwap in tsan
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TEXT sync∕atomic·CompareAndSwapInt32(SB), NOSPLIT, $0-0
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// void __tsan_go_atomic32_compare_exchange(
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// ThreadState *thr, uptr cpc, uptr pc, u8 *a)
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MOVD $__tsan_go_atomic32_compare_exchange(SB), R8
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ADD $32, R1, R6 // addr of caller's 1st arg
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BR racecallatomic<>(SB)
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TEXT sync∕atomic·CompareAndSwapInt64(SB), NOSPLIT, $0-0
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// void __tsan_go_atomic32_compare_exchange(
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// ThreadState *thr, uptr cpc, uptr pc, u8 *a)
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MOVD $__tsan_go_atomic64_compare_exchange(SB), R8
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ADD $32, R1, R6 // addr of caller's 1st arg
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BR racecallatomic<>(SB)
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TEXT sync∕atomic·CompareAndSwapUint32(SB), NOSPLIT, $0-0
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BR sync∕atomic·CompareAndSwapInt32(SB)
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TEXT sync∕atomic·CompareAndSwapUint64(SB), NOSPLIT, $0-0
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BR sync∕atomic·CompareAndSwapInt64(SB)
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TEXT sync∕atomic·CompareAndSwapUintptr(SB), NOSPLIT, $0-0
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BR sync∕atomic·CompareAndSwapInt64(SB)
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// Common function used to call tsan's atomic functions
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// R3 = *ThreadState
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// R4 = TODO: What's this supposed to be?
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// R5 = caller pc
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// R6 = addr of incoming arg list
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// R8 contains addr of target function.
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TEXT racecallatomic<>(SB), NOSPLIT, $0-0
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// Trigger SIGSEGV early if address passed to atomic function is bad.
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MOVD (R6), R7 // 1st arg is addr
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MOVD (R7), R9 // segv here if addr is bad
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// Check that addr is within [arenastart, arenaend) or within [racedatastart, racedataend).
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MOVD runtime·racearenastart(SB), R9
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CMP R7, R9
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BLT racecallatomic_data
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MOVD runtime·racearenaend(SB), R9
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CMP R7, R9
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BLT racecallatomic_ok
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racecallatomic_data:
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MOVD runtime·racedatastart(SB), R9
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CMP R7, R9
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BLT racecallatomic_ignore
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MOVD runtime·racedataend(SB), R9
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CMP R7, R9
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BGE racecallatomic_ignore
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racecallatomic_ok:
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// Addr is within the good range, call the atomic function.
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MOVD runtime·tls_g(SB), R10
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MOVD 0(R13)(R10*1), g
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MOVD g_racectx(g), R3 // goroutine racectx aka *ThreadState
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MOVD R8, R5 // pc is the function called
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MOVD (R1), R4 // caller pc from stack
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BL racecall<>(SB) // BL needed to maintain stack consistency
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RET //
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racecallatomic_ignore:
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// Addr is outside the good range.
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// Call __tsan_go_ignore_sync_begin to ignore synchronization during the atomic op.
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// An attempt to synchronize on the address would cause crash.
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MOVD R8, R15 // save the original function
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MOVD R6, R17 // save the original arg list addr
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MOVD $__tsan_go_ignore_sync_begin(SB), R8 // func addr to call
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MOVD runtime·tls_g(SB), R10
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MOVD 0(R13)(R10*1), g
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MOVD g_racectx(g), R3 // goroutine context
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BL racecall<>(SB)
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MOVD R15, R8 // restore the original function
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MOVD R17, R6 // restore arg list addr
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// Call the atomic function.
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// racecall will call LLVM race code which might clobber r30 (g)
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MOVD runtime·tls_g(SB), R10
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MOVD 0(R13)(R10*1), g
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MOVD g_racectx(g), R3
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MOVD R8, R4 // pc being called same TODO as above
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MOVD (R1), R5 // caller pc from latest LR
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BL racecall<>(SB)
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// Call __tsan_go_ignore_sync_end.
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MOVD $__tsan_go_ignore_sync_end(SB), R8
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MOVD g_racectx(g), R3 // goroutine context g should sitll be good?
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BL racecall<>(SB)
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RET
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// void runtime·racecall(void(*f)(...), ...)
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// Calls C function f from race runtime and passes up to 4 arguments to it.
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// The arguments are never heap-object-preserving pointers, so we pretend there are no arguments.
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TEXT runtime·racecall(SB), NOSPLIT, $0-0
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MOVD fn+0(FP), R8
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MOVD arg0+8(FP), R3
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MOVD arg1+16(FP), R4
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MOVD arg2+24(FP), R5
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MOVD arg3+32(FP), R6
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JMP racecall<>(SB)
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// Finds g0 and sets its stack
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// Arguments were loaded for call from Go to C
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TEXT racecall<>(SB), NOSPLIT, $0-0
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// Set the LR slot for the ppc64 ABI
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MOVD LR, R10
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MOVD R10, 0(R1) // Go expectation
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MOVD R10, 16(R1) // C ABI
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// Get info from the current goroutine
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MOVD runtime·tls_g(SB), R10 // g offset in TLS
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MOVD 0(R13)(R10*1), g // R13 = current TLS
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MOVD g_m(g), R7 // m for g
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MOVD R1, R16 // callee-saved, preserved across C call
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MOVD m_g0(R7), R10 // g0 for m
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CMP R10, g // same g0?
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BEQ call // already on g0
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MOVD (g_sched+gobuf_sp)(R10), R1 // switch R1
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call:
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MOVD R8, CTR // R8 = caller addr
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MOVD R8, R12 // expected by PPC64 ABI
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BL (CTR)
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XOR R0, R0 // clear R0 on return from Clang
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MOVD R16, R1 // restore R1; R16 nonvol in Clang
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MOVD runtime·tls_g(SB), R10 // find correct g
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MOVD 0(R13)(R10*1), g
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MOVD 16(R1), R10 // LR was saved away, restore for return
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MOVD R10, LR
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RET
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// C->Go callback thunk that allows to call runtime·racesymbolize from C code.
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// Direct Go->C race call has only switched SP, finish g->g0 switch by setting correct g.
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// The overall effect of Go->C->Go call chain is similar to that of mcall.
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// RARG0 contains command code. RARG1 contains command-specific context.
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// See racecallback for command codes.
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TEXT runtime·racecallbackthunk(SB), NOSPLIT, $-8
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// Handle command raceGetProcCmd (0) here.
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// First, code below assumes that we are on curg, while raceGetProcCmd
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// can be executed on g0. Second, it is called frequently, so will
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// benefit from this fast path.
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XOR R0, R0 // clear R0 since we came from C code
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CMP R3, $0
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BNE rest
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// g0 TODO: Don't modify g here since R30 is nonvolatile
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MOVD g, R9
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MOVD runtime·tls_g(SB), R10
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MOVD 0(R13)(R10*1), g
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MOVD g_m(g), R3
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MOVD m_p(R3), R3
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MOVD p_racectx(R3), R3
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MOVD R3, (R4)
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MOVD R9, g // restore R30 ??
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RET
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// This is all similar to what cgo does
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// Save registers according to the ppc64 ABI
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rest:
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MOVD LR, R10 // save link register
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MOVD R10, 16(R1)
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MOVW CR, R10
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MOVW R10, 8(R1)
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MOVDU R1, -336(R1) // Allocate frame needed for register save area
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MOVD R14, 40(R1)
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MOVD R15, 48(R1)
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MOVD R16, 56(R1)
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MOVD R17, 64(R1)
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MOVD R18, 72(R1)
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MOVD R19, 80(R1)
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MOVD R20, 88(R1)
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MOVD R21, 96(R1)
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MOVD R22, 104(R1)
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MOVD R23, 112(R1)
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MOVD R24, 120(R1)
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MOVD R25, 128(R1)
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MOVD R26, 136(R1)
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MOVD R27, 144(R1)
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MOVD R28, 152(R1)
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MOVD R29, 160(R1)
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MOVD g, 168(R1) // R30
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MOVD R31, 176(R1)
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FMOVD F14, 184(R1)
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FMOVD F15, 192(R1)
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FMOVD F16, 200(R1)
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FMOVD F17, 208(R1)
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FMOVD F18, 216(R1)
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FMOVD F19, 224(R1)
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FMOVD F20, 232(R1)
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FMOVD F21, 240(R1)
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FMOVD F22, 248(R1)
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FMOVD F23, 256(R1)
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FMOVD F24, 264(R1)
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FMOVD F25, 272(R1)
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FMOVD F26, 280(R1)
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FMOVD F27, 288(R1)
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FMOVD F28, 296(R1)
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FMOVD F29, 304(R1)
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FMOVD F30, 312(R1)
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FMOVD F31, 320(R1)
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MOVD runtime·tls_g(SB), R10
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MOVD 0(R13)(R10*1), g
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MOVD g_m(g), R7
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MOVD m_g0(R7), g // set g = m-> g0
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MOVD R3, cmd+0(FP) // can't use R1 here ?? use input args and assumer caller expects those?
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MOVD R4, ctx+8(FP) // can't use R1 here ??
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BL runtime·racecallback(SB)
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// All registers are clobbered after Go code, reload.
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MOVD runtime·tls_g(SB), R10
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MOVD 0(R13)(R10*1), g
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MOVD g_m(g), R7
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MOVD m_curg(R7), g // restore g = m->curg
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MOVD 40(R1), R14
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MOVD 48(R1), R15
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MOVD 56(R1), R16
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MOVD 64(R1), R17
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MOVD 72(R1), R18
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MOVD 80(R1), R19
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MOVD 88(R1), R20
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MOVD 96(R1), R21
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MOVD 104(R1), R22
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MOVD 112(R1), R23
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MOVD 120(R1), R24
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MOVD 128(R1), R25
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MOVD 136(R1), R26
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MOVD 144(R1), R27
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MOVD 152(R1), R28
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MOVD 160(R1), R29
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MOVD 168(R1), g // R30
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MOVD 176(R1), R31
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FMOVD 184(R1), F14
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FMOVD 192(R1), F15
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FMOVD 200(R1), F16
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FMOVD 208(R1), F17
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FMOVD 216(R1), F18
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FMOVD 224(R1), F19
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FMOVD 232(R1), F20
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FMOVD 240(R1), F21
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FMOVD 248(R1), F22
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FMOVD 256(R1), F23
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FMOVD 264(R1), F24
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FMOVD 272(R1), F25
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FMOVD 280(R1), F26
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FMOVD 288(R1), F27
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FMOVD 296(R1), F28
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FMOVD 304(R1), F29
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FMOVD 312(R1), F30
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FMOVD 320(R1), F31
|
|
ADD $336, R1
|
MOVD 8(R1), R10
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MOVFL R10, $0xff // Restore of CR
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MOVD 16(R1), R10 // needed?
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MOVD R10, LR
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RET
|
|
// tls_g, g value for each thread in TLS
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GLOBL runtime·tls_g+0(SB), TLSBSS+DUPOK, $8
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