| // Copyright 2016 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. |
| |
| //go:build mips64 || mips64le |
| |
| #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 |
| MOVV _crosscall2_ptr(SB), R5 |
| MOVV $crosscall2_trampoline<>(SB), R6 |
| MOVV R6, (R5) |
| 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 |
| /* |
| * We still need to save all callee save register as before, and then |
| * push 3 args for fn (R4, R5, R7), skipping R6. |
| * Also note that at procedure entry in gc world, 8(R29) will be the |
| * first arg. |
| */ |
| #ifndef GOMIPS64_softfloat |
| ADDV $(-8*23), R29 |
| #else |
| ADDV $(-8*15), R29 |
| #endif |
| MOVV R4, (8*1)(R29) // fn unsafe.Pointer |
| MOVV R5, (8*2)(R29) // a unsafe.Pointer |
| MOVV R7, (8*3)(R29) // ctxt uintptr |
| MOVV R16, (8*4)(R29) |
| MOVV R17, (8*5)(R29) |
| MOVV R18, (8*6)(R29) |
| MOVV R19, (8*7)(R29) |
| MOVV R20, (8*8)(R29) |
| MOVV R21, (8*9)(R29) |
| MOVV R22, (8*10)(R29) |
| MOVV R23, (8*11)(R29) |
| MOVV RSB, (8*12)(R29) |
| MOVV g, (8*13)(R29) |
| MOVV R31, (8*14)(R29) |
| #ifndef GOMIPS64_softfloat |
| MOVD F24, (8*15)(R29) |
| MOVD F25, (8*16)(R29) |
| MOVD F26, (8*17)(R29) |
| MOVD F27, (8*18)(R29) |
| MOVD F28, (8*19)(R29) |
| MOVD F29, (8*20)(R29) |
| MOVD F30, (8*21)(R29) |
| MOVD F31, (8*22)(R29) |
| #endif |
| // Initialize Go ABI environment |
| // prepare SB register = PC & 0xffffffff00000000 |
| BGEZAL R0, 1(PC) |
| SRLV $32, R31, RSB |
| SLLV $32, RSB |
| JAL runtime·load_g(SB) |
| |
| JAL runtime·cgocallback(SB) |
| |
| MOVV (8*4)(R29), R16 |
| MOVV (8*5)(R29), R17 |
| MOVV (8*6)(R29), R18 |
| MOVV (8*7)(R29), R19 |
| MOVV (8*8)(R29), R20 |
| MOVV (8*9)(R29), R21 |
| MOVV (8*10)(R29), R22 |
| MOVV (8*11)(R29), R23 |
| MOVV (8*12)(R29), RSB |
| MOVV (8*13)(R29), g |
| MOVV (8*14)(R29), R31 |
| #ifndef GOMIPS64_softfloat |
| MOVD (8*15)(R29), F24 |
| MOVD (8*16)(R29), F25 |
| MOVD (8*17)(R29), F26 |
| MOVD (8*18)(R29), F27 |
| MOVD (8*19)(R29), F28 |
| MOVD (8*20)(R29), F29 |
| MOVD (8*21)(R29), F30 |
| MOVD (8*22)(R29), F31 |
| ADDV $(8*23), R29 |
| #else |
| ADDV $(8*15), R29 |
| #endif |
| RET |
