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// Copyright 2012 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. #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), R1 MOVW $crosscall2_trampoline<>(SB), R2 MOVW R2, (R1) 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 SUB $(8*9), R13 // Reserve space for the floating point registers. // The C arguments arrive in R0, R1, R2, and R3. We want to // pass R0, R1, and R3 to Go, so we push those on the stack. // Also, save C callee-save registers R4-R12. MOVM.WP [R0, R1, R3, R4, R5, R6, R7, R8, R9, g, R11, R12], (R13) // Finally, save the link register R14. This also puts the // arguments we pushed for cgocallback where they need to be, // starting at 4(R13). MOVW.W R14, -4(R13) // Skip floating point registers if goarmsoftfp!=0. MOVB runtime·goarmsoftfp(SB), R11 CMP $0, R11 BNE skipfpsave MOVD F8, (13*4+8*1)(R13) MOVD F9, (13*4+8*2)(R13) MOVD F10, (13*4+8*3)(R13) MOVD F11, (13*4+8*4)(R13) MOVD F12, (13*4+8*5)(R13) MOVD F13, (13*4+8*6)(R13) MOVD F14, (13*4+8*7)(R13) MOVD F15, (13*4+8*8)(R13) skipfpsave: BL runtime·load_g(SB) // We set up the arguments to cgocallback when saving registers above. BL runtime·cgocallback(SB) MOVB runtime·goarmsoftfp(SB), R11 CMP $0, R11 BNE skipfprest MOVD (13*4+8*1)(R13), F8 MOVD (13*4+8*2)(R13), F9 MOVD (13*4+8*3)(R13), F10 MOVD (13*4+8*4)(R13), F11 MOVD (13*4+8*5)(R13), F12 MOVD (13*4+8*6)(R13), F13 MOVD (13*4+8*7)(R13), F14 MOVD (13*4+8*8)(R13), F15 skipfprest: MOVW.P 4(R13), R14 MOVM.IAW (R13), [R0, R1, R3, R4, R5, R6, R7, R8, R9, g, R11, R12] ADD $(8*9), R13 MOVW R14, R15