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Dosya Düzenle: asm_mips64x.s
// 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
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