| // 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" |
| |
| // 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 on GOARM < 6. |
| MOVB runtime·goarm(SB), R11 |
| CMP $6, R11 |
| BLT 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·goarm(SB), R11 |
| CMP $6, R11 |
| BLT 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 |
