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// Copyright 2014 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.
//go:build ppc64 || ppc64le
#include "textflag.h"
#include "asm_ppc64x.h"
#include "abi_ppc64x.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.
// The value of R2 is saved on the new stack frame, and not
// the caller's frame due to issue #43228.
TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
// Start with standard C stack frame layout and linkage, allocate
// 32 bytes of argument space, save callee-save regs, and set R0 to $0.
STACK_AND_SAVE_HOST_TO_GO_ABI(32)
// The above will not preserve R2 (TOC). Save it in case Go is
// compiled without a TOC pointer (e.g -buildmode=default).
MOVD R2, 24(R1)
// Load the current g.
BL runtime·load_g(SB)
#ifdef GO_PPC64X_HAS_FUNCDESC
// Load the real entry address from the first slot of the function descriptor.
MOVD 8(R3), R2
MOVD (R3), R3
#endif
MOVD R3, FIXED_FRAME+0(R1) // fn unsafe.Pointer
MOVD R4, FIXED_FRAME+8(R1) // a unsafe.Pointer
// Skip R5 = n uint32
MOVD R6, FIXED_FRAME+16(R1) // ctxt uintptr
BL runtime·cgocallback(SB)
// Restore the old frame, and R2.
MOVD 24(R1), R2
UNSTACK_AND_RESTORE_GO_TO_HOST_ABI(32)
RET
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