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// Macros for transitioning from the host ABI to Go ABI0.
6//
7// These macros save and restore the callee-saved registers
8// from the stack, but they don't adjust stack pointer, so
9// the user should prepare stack space in advance.
10// SAVE_R19_TO_R28(offset) saves R19 ~ R28 to the stack space
11// of ((offset)+0*8)(RSP) ~ ((offset)+9*8)(RSP).
12//
13// SAVE_F8_TO_F15(offset) saves F8 ~ F15 to the stack space
14// of ((offset)+0*8)(RSP) ~ ((offset)+7*8)(RSP).
15//
16// R29 is not saved because Go will save and restore it.
17
18#define SAVE_R19_TO_R28(offset) \
19 STP (R19, R20), ((offset)+0*8)(RSP) \
20 STP (R21, R22), ((offset)+2*8)(RSP) \
21 STP (R23, R24), ((offset)+4*8)(RSP) \
22 STP (R25, R26), ((offset)+6*8)(RSP) \
23 STP (R27, g), ((offset)+8*8)(RSP)
24#define RESTORE_R19_TO_R28(offset) \
25 LDP ((offset)+0*8)(RSP), (R19, R20) \
26 LDP ((offset)+2*8)(RSP), (R21, R22) \
27 LDP ((offset)+4*8)(RSP), (R23, R24) \
28 LDP ((offset)+6*8)(RSP), (R25, R26) \
29 LDP ((offset)+8*8)(RSP), (R27, g) /* R28 */
30#define SAVE_F8_TO_F15(offset) \
31 FSTPD (F8, F9), ((offset)+0*8)(RSP) \
32 FSTPD (F10, F11), ((offset)+2*8)(RSP) \
33 FSTPD (F12, F13), ((offset)+4*8)(RSP) \
34 FSTPD (F14, F15), ((offset)+6*8)(RSP)
35#define RESTORE_F8_TO_F15(offset) \
36 FLDPD ((offset)+0*8)(RSP), (F8, F9) \
37 FLDPD ((offset)+2*8)(RSP), (F10, F11) \
38 FLDPD ((offset)+4*8)(RSP), (F12, F13) \
39 FLDPD ((offset)+6*8)(RSP), (F14, F15)