| // 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 路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路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路load_g(SB) | |
| // We set up the arguments to cgocallback when saving registers above. | |
| BL runtime路cgocallback(SB) | |
| MOVB runtime路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 | |