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Diffstat (limited to 'src/runtime/cgo/asm_loong64.s')
| -rw-r--r-- | src/runtime/cgo/asm_loong64.s | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/runtime/cgo/asm_loong64.s b/src/runtime/cgo/asm_loong64.s new file mode 100644 index 0000000..19c8d74 --- /dev/null +++ b/src/runtime/cgo/asm_loong64.s @@ -0,0 +1,53 @@ +// 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" + +// Set the x_crosscall2_ptr C function pointer variable point to crosscall2. +// It's such a pointer chain: _crosscall2_ptr -> x_crosscall2_ptr -> crosscall2 +// Use a local trampoline, to avoid taking the address of a dynamically exported +// function. +TEXT ·set_crosscall2(SB),NOSPLIT,$0-0 + MOVV _crosscall2_ptr(SB), R5 + MOVV $crosscall2_trampoline<>(SB), R6 + MOVV R6, (R5) + RET + +TEXT crosscall2_trampoline<>(SB),NOSPLIT,$0-0 + JMP crosscall2(SB) + +// 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 |