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Diffstat (limited to 'src/runtime/cgo/asm_riscv64.s')
| -rw-r--r-- | src/runtime/cgo/asm_riscv64.s | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/src/runtime/cgo/asm_riscv64.s b/src/runtime/cgo/asm_riscv64.s new file mode 100644 index 0000000..d75a543 --- /dev/null +++ b/src/runtime/cgo/asm_riscv64.s @@ -0,0 +1,91 @@ +// Copyright 2020 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" + +// 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 + MOV _crosscall2_ptr(SB), X7 + MOV $crosscall2_trampoline<>(SB), X8 + MOV X8, (X7) + 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 + /* + * Push arguments for fn (X10, X11, X13), along with all callee-save + * registers. Note that at procedure entry the first argument is at + * 8(X2). + */ + ADD $(-8*29), X2 + MOV X10, (8*1)(X2) // fn unsafe.Pointer + MOV X11, (8*2)(X2) // a unsafe.Pointer + MOV X13, (8*3)(X2) // ctxt uintptr + MOV X8, (8*4)(X2) + MOV X9, (8*5)(X2) + MOV X18, (8*6)(X2) + MOV X19, (8*7)(X2) + MOV X20, (8*8)(X2) + MOV X21, (8*9)(X2) + MOV X22, (8*10)(X2) + MOV X23, (8*11)(X2) + MOV X24, (8*12)(X2) + MOV X25, (8*13)(X2) + MOV X26, (8*14)(X2) + MOV g, (8*15)(X2) + MOV X1, (8*16)(X2) + MOVD F8, (8*17)(X2) + MOVD F9, (8*18)(X2) + MOVD F18, (8*19)(X2) + MOVD F19, (8*20)(X2) + MOVD F20, (8*21)(X2) + MOVD F21, (8*22)(X2) + MOVD F22, (8*23)(X2) + MOVD F23, (8*24)(X2) + MOVD F24, (8*25)(X2) + MOVD F25, (8*26)(X2) + MOVD F26, (8*27)(X2) + MOVD F27, (8*28)(X2) + + // Initialize Go ABI environment + CALL runtime·load_g(SB) + CALL runtime·cgocallback(SB) + + MOV (8*4)(X2), X8 + MOV (8*5)(X2), X9 + MOV (8*6)(X2), X18 + MOV (8*7)(X2), X19 + MOV (8*8)(X2), X20 + MOV (8*9)(X2), X21 + MOV (8*10)(X2), X22 + MOV (8*11)(X2), X23 + MOV (8*12)(X2), X24 + MOV (8*13)(X2), X25 + MOV (8*14)(X2), X26 + MOV (8*15)(X2), g + MOV (8*16)(X2), X1 + MOVD (8*17)(X2), F8 + MOVD (8*18)(X2), F9 + MOVD (8*19)(X2), F18 + MOVD (8*20)(X2), F19 + MOVD (8*21)(X2), F20 + MOVD (8*22)(X2), F21 + MOVD (8*23)(X2), F22 + MOVD (8*24)(X2), F23 + MOVD (8*25)(X2), F24 + MOVD (8*26)(X2), F25 + MOVD (8*27)(X2), F26 + MOVD (8*28)(X2), F27 + ADD $(8*29), X2 + + RET |