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Editing: asm_mipsx.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 mips || mipsle #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 MOVW _crosscall2_ptr(SB), R5 MOVW $crosscall2_trampoline<>(SB), R6 MOVW 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, 4(R29) will be the * first arg. */ // Space for 9 caller-saved GPR + LR + 6 caller-saved FPR. // O32 ABI allows us to smash 16 bytes argument area of caller frame. #ifndef GOMIPS_softfloat SUBU $(4*14+8*6-16), R29 #else SUBU $(4*14-16), R29 // For soft-float, no FPR. #endif MOVW R4, (4*1)(R29) // fn unsafe.Pointer MOVW R5, (4*2)(R29) // a unsafe.Pointer MOVW R7, (4*3)(R29) // ctxt uintptr MOVW R16, (4*4)(R29) MOVW R17, (4*5)(R29) MOVW R18, (4*6)(R29) MOVW R19, (4*7)(R29) MOVW R20, (4*8)(R29) MOVW R21, (4*9)(R29) MOVW R22, (4*10)(R29) MOVW R23, (4*11)(R29) MOVW g, (4*12)(R29) MOVW R31, (4*13)(R29) #ifndef GOMIPS_softfloat MOVD F20, (4*14)(R29) MOVD F22, (4*14+8*1)(R29) MOVD F24, (4*14+8*2)(R29) MOVD F26, (4*14+8*3)(R29) MOVD F28, (4*14+8*4)(R29) MOVD F30, (4*14+8*5)(R29) #endif JAL runtime·load_g(SB) JAL runtime·cgocallback(SB) MOVW (4*4)(R29), R16 MOVW (4*5)(R29), R17 MOVW (4*6)(R29), R18 MOVW (4*7)(R29), R19 MOVW (4*8)(R29), R20 MOVW (4*9)(R29), R21 MOVW (4*10)(R29), R22 MOVW (4*11)(R29), R23 MOVW (4*12)(R29), g MOVW (4*13)(R29), R31 #ifndef GOMIPS_softfloat MOVD (4*14)(R29), F20 MOVD (4*14+8*1)(R29), F22 MOVD (4*14+8*2)(R29), F24 MOVD (4*14+8*3)(R29), F26 MOVD (4*14+8*4)(R29), F28 MOVD (4*14+8*5)(R29), F30 ADDU $(4*14+8*6-16), R29 #else ADDU $(4*14-16), R29 #endif RET
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