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Member "go/src/runtime/cgo/abi_arm64.h" (26 Apr 2023, 1531 Bytes) of package /linux/misc/go1.20.4.src.tar.gz:

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    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 
   25 #define RESTORE_R19_TO_R28(offset) \
   26     LDP ((offset)+0*8)(RSP), (R19, R20) \
   27     LDP ((offset)+2*8)(RSP), (R21, R22) \
   28     LDP ((offset)+4*8)(RSP), (R23, R24) \
   29     LDP ((offset)+6*8)(RSP), (R25, R26) \
   30     LDP ((offset)+8*8)(RSP), (R27, g) /* R28 */
   31 
   32 #define SAVE_F8_TO_F15(offset) \
   33     FSTPD   (F8, F9), ((offset)+0*8)(RSP) \
   34     FSTPD   (F10, F11), ((offset)+2*8)(RSP) \
   35     FSTPD   (F12, F13), ((offset)+4*8)(RSP) \
   36     FSTPD   (F14, F15), ((offset)+6*8)(RSP)
   37 
   38 #define RESTORE_F8_TO_F15(offset) \
   39     FLDPD   ((offset)+0*8)(RSP), (F8, F9) \
   40     FLDPD   ((offset)+2*8)(RSP), (F10, F11) \
   41     FLDPD   ((offset)+4*8)(RSP), (F12, F13) \
   42     FLDPD   ((offset)+6*8)(RSP), (F14, F15)
   43