github.com/lovishpuri/go-40569/src@v0.0.0-20230519171745-f8623e7c56cf/runtime/cgo/asm_mipsx.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 mips || mipsle 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 MOVW _crosscall2_ptr(SB), R5 13 MOVW $crosscall2(SB), R6 14 MOVW 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, 4(R29) will be the 26 * first arg. 27 */ 28 29 // Space for 9 caller-saved GPR + LR + 6 caller-saved FPR. 30 // O32 ABI allows us to smash 16 bytes argument area of caller frame. 31 #ifndef GOMIPS_softfloat 32 SUBU $(4*14+8*6-16), R29 33 #else 34 SUBU $(4*14-16), R29 // For soft-float, no FPR. 35 #endif 36 MOVW R4, (4*1)(R29) // fn unsafe.Pointer 37 MOVW R5, (4*2)(R29) // a unsafe.Pointer 38 MOVW R7, (4*3)(R29) // ctxt uintptr 39 MOVW R16, (4*4)(R29) 40 MOVW R17, (4*5)(R29) 41 MOVW R18, (4*6)(R29) 42 MOVW R19, (4*7)(R29) 43 MOVW R20, (4*8)(R29) 44 MOVW R21, (4*9)(R29) 45 MOVW R22, (4*10)(R29) 46 MOVW R23, (4*11)(R29) 47 MOVW g, (4*12)(R29) 48 MOVW R31, (4*13)(R29) 49 #ifndef GOMIPS_softfloat 50 MOVD F20, (4*14)(R29) 51 MOVD F22, (4*14+8*1)(R29) 52 MOVD F24, (4*14+8*2)(R29) 53 MOVD F26, (4*14+8*3)(R29) 54 MOVD F28, (4*14+8*4)(R29) 55 MOVD F30, (4*14+8*5)(R29) 56 #endif 57 JAL runtime·load_g(SB) 58 59 JAL runtime·cgocallback(SB) 60 61 MOVW (4*4)(R29), R16 62 MOVW (4*5)(R29), R17 63 MOVW (4*6)(R29), R18 64 MOVW (4*7)(R29), R19 65 MOVW (4*8)(R29), R20 66 MOVW (4*9)(R29), R21 67 MOVW (4*10)(R29), R22 68 MOVW (4*11)(R29), R23 69 MOVW (4*12)(R29), g 70 MOVW (4*13)(R29), R31 71 #ifndef GOMIPS_softfloat 72 MOVD (4*14)(R29), F20 73 MOVD (4*14+8*1)(R29), F22 74 MOVD (4*14+8*2)(R29), F24 75 MOVD (4*14+8*3)(R29), F26 76 MOVD (4*14+8*4)(R29), F28 77 MOVD (4*14+8*5)(R29), F30 78 79 ADDU $(4*14+8*6-16), R29 80 #else 81 ADDU $(4*14-16), R29 82 #endif 83 RET