1 // Copyright 2012 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 #include "textflag.h" 6 7 // Called by C code generated by cmd/cgo. 8 // func crosscall2(fn func(a unsafe.Pointer, n int32, ctxt uintptr), a unsafe.Pointer, n int32, ctxt uintptr) 9 // Saves C callee-saved registers and calls fn with three arguments. 10 TEXT crosscall2(SB),NOSPLIT,$-4 11 /* 12 * We still need to save all callee save register as before, and then 13 * push 3 args for fn (R1, R2, R3). 14 * Also note that at procedure entry in gc world, 4(R13) will be the 15 * first arg, so we must push another dummy reg (R0) for 0(R13). 16 * Additionally, runtimeload_g will clobber R0, so we need to save R0 17 * nevertheless. 18 */ 19 SUB $(8*9), R13 // Reserve space for the floating point registers. 20 MOVM.WP [R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, g, R11, R12, R14], (R13) 21 22 // Skip floating point registers on GOARM < 6. 23 MOVB runtimegoarm(SB), R11 24 CMP $6, R11 25 BLT skipfpsave 26 MOVD F8, (14*4+8*1)(R13) 27 MOVD F9, (14*4+8*2)(R13) 28 MOVD F10, (14*4+8*3)(R13) 29 MOVD F11, (14*4+8*4)(R13) 30 MOVD F12, (14*4+8*5)(R13) 31 MOVD F13, (14*4+8*6)(R13) 32 MOVD F14, (14*4+8*7)(R13) 33 MOVD F15, (14*4+8*8)(R13) 34 35 skipfpsave: 36 BL runtimeload_g(SB) 37 MOVW R15, R14 // R15 is PC. 38 MOVW 0(R13), R15 39 40 MOVB runtimegoarm(SB), R11 41 CMP $6, R11 42 BLT skipfprest 43 MOVD (14*4+8*1)(R13), F8 44 MOVD (14*4+8*2)(R13), F9 45 MOVD (14*4+8*3)(R13), F10 46 MOVD (14*4+8*4)(R13), F11 47 MOVD (14*4+8*5)(R13), F12 48 MOVD (14*4+8*6)(R13), F13 49 MOVD (14*4+8*7)(R13), F14 50 MOVD (14*4+8*8)(R13), F15 51 52 skipfprest: 53 MOVM.IAW (R13), [R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, g, R11, R12, R14] 54 ADD $(8*9), R13 55 MOVW R14, R15 56
