1// Copyright 2022 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 "textflag.h"
9
10#define RARG0 R3
11#define RARG1 R4
12#define RARG2 R5
13#define RARG3 R6
14#define FARG R12
15
16// Called from instrumented code.
17// func runtime·doasanread(addr unsafe.Pointer, sz, sp, pc uintptr)
18TEXT	runtime·doasanread(SB),NOSPLIT|NOFRAME,$0-32
19	MOVD	addr+0(FP), RARG0
20	MOVD	sz+8(FP), RARG1
21	MOVD	sp+16(FP), RARG2
22	MOVD	pc+24(FP), RARG3
23	// void __asan_read_go(void *addr, uintptr_t sz, void *sp, void *pc);
24	MOVD	$__asan_read_go(SB), FARG
25	BR	asancall<>(SB)
26
27// func runtime·doasanwrite(addr unsafe.Pointer, sz, sp, pc uintptr)
28TEXT	runtime·doasanwrite(SB),NOSPLIT|NOFRAME,$0-32
29	MOVD	addr+0(FP), RARG0
30	MOVD	sz+8(FP), RARG1
31	MOVD	sp+16(FP), RARG2
32	MOVD	pc+24(FP), RARG3
33	// void __asan_write_go(void *addr, uintptr_t sz, void *sp, void *pc);
34	MOVD	$__asan_write_go(SB), FARG
35	BR	asancall<>(SB)
36
37// func runtime·asanunpoison(addr unsafe.Pointer, sz uintptr)
38TEXT	runtime·asanunpoison(SB),NOSPLIT|NOFRAME,$0-16
39	MOVD	addr+0(FP), RARG0
40	MOVD	sz+8(FP), RARG1
41	// void __asan_unpoison_go(void *addr, uintptr_t sz);
42	MOVD	$__asan_unpoison_go(SB), FARG
43	BR	asancall<>(SB)
44
45// func runtime·asanpoison(addr unsafe.Pointer, sz uintptr)
46TEXT	runtime·asanpoison(SB),NOSPLIT|NOFRAME,$0-16
47	MOVD	addr+0(FP), RARG0
48	MOVD	sz+8(FP), RARG1
49	// void __asan_poison_go(void *addr, uintptr_t sz);
50	MOVD	$__asan_poison_go(SB), FARG
51	BR	asancall<>(SB)
52
53// func runtime·asanregisterglobals(addr unsafe.Pointer, n uintptr)
54TEXT	runtime·asanregisterglobals(SB),NOSPLIT|NOFRAME,$0-16
55	MOVD	addr+0(FP), RARG0
56	MOVD	n+8(FP), RARG1
57	// void __asan_register_globals_go(void *addr, uintptr_t n);
58	MOVD	$__asan_register_globals_go(SB), FARG
59	BR	asancall<>(SB)
60
61// Switches SP to g0 stack and calls (FARG). Arguments already set.
62TEXT	asancall<>(SB), NOSPLIT, $0-0
63	// LR saved in generated prologue
64	// Get info from the current goroutine
65	MOVD	runtime·tls_g(SB), R10  // g offset in TLS
66	MOVD	0(R10), g
67	MOVD	g_m(g), R7		// m for g
68	MOVD	R1, R16			// callee-saved, preserved across C call
69	MOVD	m_g0(R7), R10		// g0 for m
70	CMP	R10, g			// same g0?
71	BEQ	call			// already on g0
72	MOVD	(g_sched+gobuf_sp)(R10), R1 // switch R1
73call:
74	// prepare frame for C ABI
75	SUB	$32, R1			// create frame for callee saving LR, CR, R2 etc.
76	RLDCR	$0, R1, $~15, R1	// align SP to 16 bytes
77	MOVD	FARG, CTR		// address of function to be called
78	MOVD	R0, 0(R1)		// clear back chain pointer
79	BL	(CTR)
80	MOVD	$0, R0			// C code can clobber R0 set it back to 0
81	MOVD	R16, R1			// restore R1;
82	MOVD	runtime·tls_g(SB), R10	// find correct g
83	MOVD	0(R10), g
84	RET
85
86// tls_g, g value for each thread in TLS
87GLOBL runtime·tls_g+0(SB), TLSBSS+DUPOK, $8
88