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// Copyright 2020 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. #include "textflag.h" // Set the x_crosscall2_ptr C function pointer variable point to crosscall2. // It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2 // Use a local trampoline, to avoid taking the address of a dynamically exported // function. TEXT ·set_crosscall2(SB),NOSPLIT,$0-0 MOV _crosscall2_ptr(SB), X7 MOV $crosscall2_trampoline<>(SB), X8 MOV X8, (X7) RET TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0 JMP crosscall2(SB) // Called by C code generated by cmd/cgo. // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr) // Saves C callee-saved registers and calls cgocallback with three arguments. // fn is the PC of a func(a unsafe.Pointer) function. TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0 /* * Push arguments for fn (X10, X11, X13), along with all callee-save * registers. Note that at procedure entry the first argument is at * 8(X2). */ ADD $(-8*29), X2 MOV X10, (8*1)(X2) // fn unsafe.Pointer MOV X11, (8*2)(X2) // a unsafe.Pointer MOV X13, (8*3)(X2) // ctxt uintptr MOV X8, (8*4)(X2) MOV X9, (8*5)(X2) MOV X18, (8*6)(X2) MOV X19, (8*7)(X2) MOV X20, (8*8)(X2) MOV X21, (8*9)(X2) MOV X22, (8*10)(X2) MOV X23, (8*11)(X2) MOV X24, (8*12)(X2) MOV X25, (8*13)(X2) MOV X26, (8*14)(X2) MOV g, (8*15)(X2) MOV X1, (8*16)(X2) MOVD F8, (8*17)(X2) MOVD F9, (8*18)(X2) MOVD F18, (8*19)(X2) MOVD F19, (8*20)(X2) MOVD F20, (8*21)(X2) MOVD F21, (8*22)(X2) MOVD F22, (8*23)(X2) MOVD F23, (8*24)(X2) MOVD F24, (8*25)(X2) MOVD F25, (8*26)(X2) MOVD F26, (8*27)(X2) MOVD F27, (8*28)(X2) // Initialize Go ABI environment CALL runtime·load_g(SB) CALL runtime·cgocallback(SB) MOV (8*4)(X2), X8 MOV (8*5)(X2), X9 MOV (8*6)(X2), X18 MOV (8*7)(X2), X19 MOV (8*8)(X2), X20 MOV (8*9)(X2), X21 MOV (8*10)(X2), X22 MOV (8*11)(X2), X23 MOV (8*12)(X2), X24 MOV (8*13)(X2), X25 MOV (8*14)(X2), X26 MOV (8*15)(X2), g MOV (8*16)(X2), X1 MOVD (8*17)(X2), F8 MOVD (8*18)(X2), F9 MOVD (8*19)(X2), F18 MOVD (8*20)(X2), F19 MOVD (8*21)(X2), F20 MOVD (8*22)(X2), F21 MOVD (8*23)(X2), F22 MOVD (8*24)(X2), F23 MOVD (8*25)(X2), F24 MOVD (8*26)(X2), F25 MOVD (8*27)(X2), F26 MOVD (8*28)(X2), F27 ADD $(8*29), X2 RET