| // 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 |
