mirror of https://go.googlesource.com/go
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// FIXED_FRAME defines the size of the fixed part of a stack frame. A stack
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// frame looks like this:
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//
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// +---------------------+
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// | local variable area |
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// +---------------------+
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// | argument area |
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// +---------------------+ <- R1+FIXED_FRAME
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// | fixed area |
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// +---------------------+ <- R1
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//
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// So a function that sets up a stack frame at all uses as least FIXED_FRAME
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// bytes of stack. This mostly affects assembly that calls other functions
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// with arguments (the arguments should be stored at FIXED_FRAME+0(R1),
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// FIXED_FRAME+8(R1) etc) and some other low-level places.
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//
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// The reason for using a constant is to make supporting PIC easier (although
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// we only support PIC on ppc64le which has a minimum 32 bytes of stack frame,
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// and currently always use that much, PIC on ppc64 would need to use 48).
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#define FIXED_FRAME 32
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// aix/ppc64 uses XCOFF which uses function descriptors.
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// AIX cannot perform the TOC relocation in a text section.
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// Therefore, these descriptors must live in a data section.
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#ifdef GOOS_aix
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#ifdef GOARCH_ppc64
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#define GO_PPC64X_HAS_FUNCDESC
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#define DEFINE_PPC64X_FUNCDESC(funcname, localfuncname) \
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DATA funcname+0(SB)/8, $localfuncname(SB) \
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DATA funcname+8(SB)/8, $TOC(SB) \
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DATA funcname+16(SB)/8, $0 \
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GLOBL funcname(SB), NOPTR, $24
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#endif
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#endif
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// linux/ppc64 uses ELFv1 which uses function descriptors.
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// These must also look like ABI0 functions on linux/ppc64
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// to work with abi.FuncPCABI0(sigtramp) in os_linux.go.
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// Only static codegen is supported on linux/ppc64, so TOC
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// is not needed.
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#ifdef GOOS_linux
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#ifdef GOARCH_ppc64
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#define GO_PPC64X_HAS_FUNCDESC
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#define DEFINE_PPC64X_FUNCDESC(funcname, localfuncname) \
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TEXT funcname(SB),NOSPLIT|NOFRAME,$0 \
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DWORD $localfuncname(SB) \
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DWORD $0 \
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DWORD $0
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#endif
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#endif
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