asm_riscv64.s raw

   1  // Copyright 2020 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  #include "textflag.h"
   6  
   7  // Called by C code generated by cmd/cgo.
   8  // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr)
   9  // Saves C callee-saved registers and calls cgocallback with three arguments.
  10  // fn is the PC of a func(a unsafe.Pointer) function.
  11  TEXT crosscall2(SB), NOSPLIT|NOFRAME, $0
  12  /*
  13   * Push arguments for fn (X10, X11, X13), along with all callee-save
  14   * registers. Note that at procedure entry the first argument is at
  15   * 8(X2).
  16   */
  17  	ADD  $(-8*29), X2
  18  	MOV  X10, (8*1)(X2)  // fn unsafe.Pointer
  19  	MOV  X11, (8*2)(X2)  // a unsafe.Pointer
  20  	MOV  X13, (8*3)(X2)  // ctxt uintptr
  21  	MOV  X8, (8*4)(X2)
  22  	MOV  X9, (8*5)(X2)
  23  	MOV  X18, (8*6)(X2)
  24  	MOV  X19, (8*7)(X2)
  25  	MOV  X20, (8*8)(X2)
  26  	MOV  X21, (8*9)(X2)
  27  	MOV  X22, (8*10)(X2)
  28  	MOV  X23, (8*11)(X2)
  29  	MOV  X24, (8*12)(X2)
  30  	MOV  X25, (8*13)(X2)
  31  	MOV  X26, (8*14)(X2)
  32  	MOV  g, (8*15)(X2)
  33  	MOV  X1, (8*16)(X2)
  34  	MOVD F8, (8*17)(X2)
  35  	MOVD F9, (8*18)(X2)
  36  	MOVD F18, (8*19)(X2)
  37  	MOVD F19, (8*20)(X2)
  38  	MOVD F20, (8*21)(X2)
  39  	MOVD F21, (8*22)(X2)
  40  	MOVD F22, (8*23)(X2)
  41  	MOVD F23, (8*24)(X2)
  42  	MOVD F24, (8*25)(X2)
  43  	MOVD F25, (8*26)(X2)
  44  	MOVD F26, (8*27)(X2)
  45  	MOVD F27, (8*28)(X2)
  46  
  47  	// Initialize Go ABI environment
  48  	CALL runtime·load_g(SB)
  49  	CALL runtime·cgocallback(SB)
  50  
  51  	MOV  (8*4)(X2), X8
  52  	MOV  (8*5)(X2), X9
  53  	MOV  (8*6)(X2), X18
  54  	MOV  (8*7)(X2), X19
  55  	MOV  (8*8)(X2), X20
  56  	MOV  (8*9)(X2), X21
  57  	MOV  (8*10)(X2), X22
  58  	MOV  (8*11)(X2), X23
  59  	MOV  (8*12)(X2), X24
  60  	MOV  (8*13)(X2), X25
  61  	MOV  (8*14)(X2), X26
  62  	MOV  (8*15)(X2), g
  63  	MOV  (8*16)(X2), X1
  64  	MOVD (8*17)(X2), F8
  65  	MOVD (8*18)(X2), F9
  66  	MOVD (8*19)(X2), F18
  67  	MOVD (8*20)(X2), F19
  68  	MOVD (8*21)(X2), F20
  69  	MOVD (8*22)(X2), F21
  70  	MOVD (8*23)(X2), F22
  71  	MOVD (8*24)(X2), F23
  72  	MOVD (8*25)(X2), F24
  73  	MOVD (8*26)(X2), F25
  74  	MOVD (8*27)(X2), F26
  75  	MOVD (8*28)(X2), F27
  76  	ADD  $(8*29), X2
  77  
  78  	RET
  79