| // 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 func(a unsafe.Pointer, n int32, ctxt uintptr), a unsafe.Pointer, n int32, ctxt uintptr) | |
| // Saves C callee-saved registers and calls fn with three arguments. | |
| TEXT crosscall2(SB),NOSPLIT,$-4 | |
| /* | |
| * We still need to save all callee save register as before, and then | |
| * push 3 args for fn (R1, R2, R3). | |
| * Also note that at procedure entry in gc world, 4(R13) will be the | |
| * first arg, so we must push another dummy reg (R0) for 0(R13). | |
| * Additionally, runtime·load_g will clobber R0, so we need to save R0 | |
| * nevertheless. | |
| */ | |
| SUB $(8*9), R13 // Reserve space for the floating point registers. | |
| MOVM.WP [R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, g, R11, R12, R14], (R13) | |
| // Skip floating point registers on GOARM < 6. | |
| MOVB runtime·goarm(SB), R11 | |
| CMP $6, R11 | |
| BLT skipfpsave | |
| MOVD F8, (14*4+8*1)(R13) | |
| MOVD F9, (14*4+8*2)(R13) | |
| MOVD F10, (14*4+8*3)(R13) | |
| MOVD F11, (14*4+8*4)(R13) | |
| MOVD F12, (14*4+8*5)(R13) | |
| MOVD F13, (14*4+8*6)(R13) | |
| MOVD F14, (14*4+8*7)(R13) | |
| MOVD F15, (14*4+8*8)(R13) | |
| skipfpsave: | |
| BL runtime·load_g(SB) | |
| MOVW R15, R14 // R15 is PC. | |
| MOVW 0(R13), R15 | |
| MOVB runtime·goarm(SB), R11 | |
| CMP $6, R11 | |
| BLT skipfprest | |
| MOVD (14*4+8*1)(R13), F8 | |
| MOVD (14*4+8*2)(R13), F9 | |
| MOVD (14*4+8*3)(R13), F10 | |
| MOVD (14*4+8*4)(R13), F11 | |
| MOVD (14*4+8*5)(R13), F12 | |
| MOVD (14*4+8*6)(R13), F13 | |
| MOVD (14*4+8*7)(R13), F14 | |
| MOVD (14*4+8*8)(R13), F15 | |
| skipfprest: | |
| MOVM.IAW (R13), [R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, g, R11, R12, R14] | |
| ADD $(8*9), R13 | |
| MOVW R14, R15 |