asan_amd64.s

     1  // Copyright 2021 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 asan
     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 asan 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  // Called from intrumented code.
    28  // func runtime·doasanread(addr unsafe.Pointer, sz, sp, pc uintptr)
    29  TEXT	runtime·doasanread(SB), NOSPLIT, $0-32
    30  	MOVQ	addr+0(FP), RARG0
    31  	MOVQ	size+8(FP), RARG1
    32  	MOVQ	sp+16(FP), RARG2
    33  	MOVQ	pc+24(FP), RARG3
    34  	// void __asan_read_go(void *addr, uintptr_t sz, void *sp, void *pc);
    35  	MOVQ	$__asan_read_go(SB), AX
    36  	JMP	asancall<>(SB)
    37  
    38  // func runtime·doasanwrite(addr unsafe.Pointer, sz, sp, pc uintptr)
    39  TEXT	runtime·doasanwrite(SB), NOSPLIT, $0-32
    40  	MOVQ	addr+0(FP), RARG0
    41  	MOVQ	size+8(FP), RARG1
    42  	MOVQ	sp+16(FP), RARG2
    43  	MOVQ	pc+24(FP), RARG3
    44  	// void __asan_write_go(void *addr, uintptr_t sz, void *sp, void *pc);
    45  	MOVQ	$__asan_write_go(SB), AX
    46  	JMP	asancall<>(SB)
    47  
    48  // func runtime·asanunpoison(addr unsafe.Pointer, sz uintptr)
    49  TEXT	runtime·asanunpoison(SB), NOSPLIT, $0-16
    50  	MOVQ	addr+0(FP), RARG0
    51  	MOVQ	size+8(FP), RARG1
    52  	// void __asan_unpoison_go(void *addr, uintptr_t sz);
    53  	MOVQ	$__asan_unpoison_go(SB), AX
    54  	JMP	asancall<>(SB)
    55  
    56  // func runtime·asanpoison(addr unsafe.Pointer, sz uintptr)
    57  TEXT	runtime·asanpoison(SB), NOSPLIT, $0-16
    58  	MOVQ	addr+0(FP), RARG0
    59  	MOVQ	size+8(FP), RARG1
    60  	// void __asan_poison_go(void *addr, uintptr_t sz);
    61  	MOVQ	$__asan_poison_go(SB), AX
    62  	JMP	asancall<>(SB)
    63  
    64  // Switches SP to g0 stack and calls (AX). Arguments already set.
    65  TEXT	asancall<>(SB), NOSPLIT, $0-0
    66  	get_tls(R12)
    67  	MOVQ	g(R12), R14
    68  	MOVQ	SP, R12		// callee-saved, preserved across the CALL
    69  	CMPQ	R14, $0
    70  	JE	call	// no g; still on a system stack
    71  
    72  	MOVQ	g_m(R14), R13
    73  	// Switch to g0 stack.
    74  	MOVQ	m_g0(R13), R10
    75  	CMPQ	R10, R14
    76  	JE	call	// already on g0
    77  
    78  	MOVQ	(g_sched+gobuf_sp)(R10), SP
    79  call:
    80  	ANDQ	$~15, SP	// alignment for gcc ABI
    81  	CALL	AX
    82  	MOVQ	R12, SP
    83  	RET
    84
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