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// 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