msan_amd64.s

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build msan
     6  
     7  #include "go_asm.h"
     8  #include "go_tls.h"
     9  #include "funcdata.h"
    10  #include "textflag.h"
    11  
    12  // This is like race_amd64.s, but for the msan calls.
    13  // See race_amd64.s for detailed comments.
    14  
    15  #ifdef GOOS_windows
    16  #define RARG0 CX
    17  #define RARG1 DX
    18  #define RARG2 R8
    19  #define RARG3 R9
    20  #else
    21  #define RARG0 DI
    22  #define RARG1 SI
    23  #define RARG2 DX
    24  #define RARG3 CX
    25  #endif
    26  
    27  // func runtime·domsanread(addr unsafe.Pointer, sz uintptr)
    28  // Called from msanread.
    29  TEXT	runtime·domsanread(SB), NOSPLIT, $0-16
    30  	MOVQ	addr+0(FP), RARG0
    31  	MOVQ	size+8(FP), RARG1
    32  	// void __msan_read_go(void *addr, uintptr_t sz);
    33  	MOVQ	$__msan_read_go(SB), AX
    34  	JMP	msancall<>(SB)
    35  
    36  // func runtime·msanwrite(addr unsafe.Pointer, sz uintptr)
    37  // Called from instrumented code.
    38  TEXT	runtime·msanwrite(SB), NOSPLIT, $0-16
    39  	MOVQ	addr+0(FP), RARG0
    40  	MOVQ	size+8(FP), RARG1
    41  	// void __msan_write_go(void *addr, uintptr_t sz);
    42  	MOVQ	$__msan_write_go(SB), AX
    43  	JMP	msancall<>(SB)
    44  
    45  // func runtime·msanmalloc(addr unsafe.Pointer, sz uintptr)
    46  TEXT	runtime·msanmalloc(SB), NOSPLIT, $0-16
    47  	MOVQ	addr+0(FP), RARG0
    48  	MOVQ	size+8(FP), RARG1
    49  	// void __msan_malloc_go(void *addr, uintptr_t sz);
    50  	MOVQ	$__msan_malloc_go(SB), AX
    51  	JMP	msancall<>(SB)
    52  
    53  // func runtime·msanfree(addr unsafe.Pointer, sz uintptr)
    54  TEXT	runtime·msanfree(SB), NOSPLIT, $0-16
    55  	MOVQ	addr+0(FP), RARG0
    56  	MOVQ	size+8(FP), RARG1
    57  	// void __msan_free_go(void *addr, uintptr_t sz);
    58  	MOVQ	$__msan_free_go(SB), AX
    59  	JMP	msancall<>(SB)
    60  
    61  // func runtime·msanmove(dst, src unsafe.Pointer, sz uintptr)
    62  TEXT	runtime·msanmove(SB), NOSPLIT, $0-24
    63  	MOVQ	dst+0(FP), RARG0
    64  	MOVQ	src+8(FP), RARG1
    65  	MOVQ	size+16(FP), RARG2
    66  	// void __msan_memmove(void *dst, void *src, uintptr_t sz);
    67  	MOVQ	$__msan_memmove(SB), AX
    68  	JMP	msancall<>(SB)
    69  
    70  // Switches SP to g0 stack and calls (AX). Arguments already set.
    71  TEXT	msancall<>(SB), NOSPLIT, $0-0
    72  	get_tls(R12)
    73  	MOVQ	g(R12), R14
    74  	MOVQ	SP, R12		// callee-saved, preserved across the CALL
    75  	CMPQ	R14, $0
    76  	JE	call	// no g; still on a system stack
    77  
    78  	MOVQ	g_m(R14), R13
    79  	// Switch to g0 stack.
    80  	MOVQ	m_g0(R13), R10
    81  	CMPQ	R10, R14
    82  	JE	call	// already on g0
    83  
    84  	MOVQ	(g_sched+gobuf_sp)(R10), SP
    85  call:
    86  	ANDQ	$~15, SP	// alignment for gcc ABI
    87  	CALL	AX
    88  	MOVQ	R12, SP
    89  	RET
    90
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