// 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.

// FIXED_FRAME defines the size of the fixed part of a stack frame. A stack

// frame looks like this:

//

// +---------------------+

// | local variable area |

// +---------------------+

// | argument area |

// +---------------------+ <- R1+FIXED_FRAME

// | fixed area |

// +---------------------+ <- R1

//

// So a function that sets up a stack frame at all uses as least FIXED_FRAME

// bytes of stack. This mostly affects assembly that calls other functions

// with arguments (the arguments should be stored at FIXED_FRAME+0(R1),

// FIXED_FRAME+8(R1) etc) and some other low-level places.

//

// The reason for using a constant is to make supporting PIC easier (although

// we only support PIC on ppc64le which has a minimum 32 bytes of stack frame,

// and currently always use that much, PIC on ppc64 would need to use 48).

#define FIXED_FRAME 32

// aix/ppc64 uses XCOFF which uses function descriptors.

// AIX cannot perform the TOC relocation in a text section.

// Therefore, these descriptors must live in a data section.

#ifdef GOOS_aix

#ifdef GOARCH_ppc64

#define GO_PPC64X_HAS_FUNCDESC

#define DEFINE_PPC64X_FUNCDESC(funcname, localfuncname) \

DATA funcname+0(SB)/8, $localfuncname(SB) \

DATA funcname+8(SB)/8, $TOC(SB) \

DATA funcname+16(SB)/8, $0 \

GLOBL funcname(SB), NOPTR, $24

#endif

#endif

// linux/ppc64 uses ELFv1 which uses function descriptors.

// These must also look like ABI0 functions on linux/ppc64

// to work with abi.FuncPCABI0(sigtramp) in os_linux.go.

// Only static codegen is supported on linux/ppc64, so TOC

// is not needed.

#ifdef GOOS_linux

#ifdef GOARCH_ppc64

#define GO_PPC64X_HAS_FUNCDESC

#define DEFINE_PPC64X_FUNCDESC(funcname, localfuncname) \

TEXT funcname(SB),NOSPLIT|NOFRAME,$0 \

DWORD $localfuncname(SB) \

DWORD $0 \

DWORD $0

#endif

#endif