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- // Copyright 2015 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"
- #include "abi_arm64.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
- /*
- * We still need to save all callee save register as before, and then
- * push 3 args for fn (R0, R1, R3), skipping R2.
- * Also note that at procedure entry in gc world, 8(RSP) will be the
- * first arg.
- */
- SUB $(8*24), RSP
- STP (R0, R1), (8*1)(RSP)
- MOVD R3, (8*3)(RSP)
- SAVE_R19_TO_R28(8*4)
- SAVE_F8_TO_F15(8*14)
- STP (R29, R30), (8*22)(RSP)
- // Initialize Go ABI environment
- BL runtime·load_g(SB)
- BL runtime·cgocallback(SB)
- RESTORE_R19_TO_R28(8*4)
- RESTORE_F8_TO_F15(8*14)
- LDP (8*22)(RSP), (R29, R30)
- ADD $(8*24), RSP
- RET
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