1 // Copyright 2014 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 #ifdef GOOS_windows
6 // Offset of the TEB's ThreadLocalStoragePointer field, which points to the
7 // array of module TLS blocks indexed by _tls_index.
8 #ifdef GOARCH_386
9 #define TEB_ThreadLocalStoragePointer 0x2c
10 #else
11 #define TEB_ThreadLocalStoragePointer 0x58
12 #endif
13 #endif
14
15 #ifdef GOARCH_arm
16 #define LR R14
17 #endif
18
19 #ifdef GOARCH_amd64
20 #ifdef GOOS_windows
21 // get_tls loads the address of the current thread's g slot into r.
22 // It clobbers R11; r must differ from R11.
23 #define get_tls(r) \
24 MOVL _tls_index(SB), r /* 32-bit TLS index, zero-extended to 64 bits. */ \
25 MOVQ TEB_ThreadLocalStoragePointer(GS), R11 /* R11 is volatile in the host ABI. */ \
26 MOVQ (R11)(r*8), r \
27 MOVQ runtime·tls_g(SB), R11 \
28 LEAQ (r)(R11*1), r
29 #else
30 #define get_tls(r) MOVQ TLS, r
31 #endif
32 #define g(r) 0(r)(TLS*1)
33 #endif
34
35 #ifdef GOARCH_386
36 #ifdef GOOS_windows
37 // get_tls2 lets callers preserve AX or load the TLS address into AX.
38 // r and scratch must differ; scratch is clobbered.
39 #define get_tls2(r, scratch) \
40 MOVL _tls_index(SB), r \
41 MOVL TEB_ThreadLocalStoragePointer(FS), scratch \
42 MOVL (scratch)(r*4), r \
43 MOVL runtime·tls_g(SB), scratch \
44 LEAL (r)(scratch*1), r
45 #define get_tls(r) get_tls2(r, AX)
46 #else
47 #define get_tls(r) MOVL TLS, r
48 #define get_tls2(r, scratch) MOVL TLS, r
49 #endif
50 #define g(r) 0(r)(TLS*1)
51 #endif
52
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