github.com/lovishpuri/go-40569/src@v0.0.0-20230519171745-f8623e7c56cf/runtime/cgo/asm_mips64x.s (about) 1 // Copyright 2016 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 //go:build mips64 || mips64le 6 7 #include "textflag.h" 8 9 // Set the x_crosscall2_ptr C function pointer variable point to crosscall2. 10 // It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2 11 TEXT ·set_crosscall2(SB),NOSPLIT,$0-0 12 MOVV _crosscall2_ptr(SB), R5 13 MOVV $crosscall2(SB), R6 14 MOVV R6, (R5) 15 RET 16 17 // Called by C code generated by cmd/cgo. 18 // func crosscall2(fn, a unsafe.Pointer, n int32, ctxt uintptr) 19 // Saves C callee-saved registers and calls cgocallback with three arguments. 20 // fn is the PC of a func(a unsafe.Pointer) function. 21 TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0 22 /* 23 * We still need to save all callee save register as before, and then 24 * push 3 args for fn (R4, R5, R7), skipping R6. 25 * Also note that at procedure entry in gc world, 8(R29) will be the 26 * first arg. 27 */ 28 #ifndef GOMIPS64_softfloat 29 ADDV $(-8*23), R29 30 #else 31 ADDV $(-8*15), R29 32 #endif 33 MOVV R4, (8*1)(R29) // fn unsafe.Pointer 34 MOVV R5, (8*2)(R29) // a unsafe.Pointer 35 MOVV R7, (8*3)(R29) // ctxt uintptr 36 MOVV R16, (8*4)(R29) 37 MOVV R17, (8*5)(R29) 38 MOVV R18, (8*6)(R29) 39 MOVV R19, (8*7)(R29) 40 MOVV R20, (8*8)(R29) 41 MOVV R21, (8*9)(R29) 42 MOVV R22, (8*10)(R29) 43 MOVV R23, (8*11)(R29) 44 MOVV RSB, (8*12)(R29) 45 MOVV g, (8*13)(R29) 46 MOVV R31, (8*14)(R29) 47 #ifndef GOMIPS64_softfloat 48 MOVD F24, (8*15)(R29) 49 MOVD F25, (8*16)(R29) 50 MOVD F26, (8*17)(R29) 51 MOVD F27, (8*18)(R29) 52 MOVD F28, (8*19)(R29) 53 MOVD F29, (8*20)(R29) 54 MOVD F30, (8*21)(R29) 55 MOVD F31, (8*22)(R29) 56 #endif 57 // Initialize Go ABI environment 58 // prepare SB register = PC & 0xffffffff00000000 59 BGEZAL R0, 1(PC) 60 SRLV $32, R31, RSB 61 SLLV $32, RSB 62 JAL runtime·load_g(SB) 63 64 JAL runtime·cgocallback(SB) 65 66 MOVV (8*4)(R29), R16 67 MOVV (8*5)(R29), R17 68 MOVV (8*6)(R29), R18 69 MOVV (8*7)(R29), R19 70 MOVV (8*8)(R29), R20 71 MOVV (8*9)(R29), R21 72 MOVV (8*10)(R29), R22 73 MOVV (8*11)(R29), R23 74 MOVV (8*12)(R29), RSB 75 MOVV (8*13)(R29), g 76 MOVV (8*14)(R29), R31 77 #ifndef GOMIPS64_softfloat 78 MOVD (8*15)(R29), F24 79 MOVD (8*16)(R29), F25 80 MOVD (8*17)(R29), F26 81 MOVD (8*18)(R29), F27 82 MOVD (8*19)(R29), F28 83 MOVD (8*20)(R29), F29 84 MOVD (8*21)(R29), F30 85 MOVD (8*22)(R29), F31 86 ADDV $(8*23), R29 87 #else 88 ADDV $(8*15), R29 89 #endif 90 RET