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- // Copyright 2022 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_loong64.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 (R4, R5, R7), skipping R6.
- * Also note that at procedure entry in gc world, 8(R29) will be the
- * first arg.
- */
- ADDV $(-23*8), R3
- MOVV R4, (1*8)(R3) // fn unsafe.Pointer
- MOVV R5, (2*8)(R3) // a unsafe.Pointer
- MOVV R7, (3*8)(R3) // ctxt uintptr
- SAVE_R22_TO_R31((4*8))
- SAVE_F24_TO_F31((14*8))
- MOVV R1, (22*8)(R3)
- // Initialize Go ABI environment
- JAL runtime·load_g(SB)
- JAL runtime·cgocallback(SB)
- RESTORE_R22_TO_R31((4*8))
- RESTORE_F24_TO_F31((14*8))
- MOVV (22*8)(R3), R1
- ADDV $(23*8), R3
- RET
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