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decd810945
A TLS slot is reserved by _rt0_.*_plan9 as an automatic and its address (which is static on Plan 9) is saved in the global _privates symbol. The startup linkage now is exactly like that from Plan 9 libc, and the way we access g is exactly as if we'd have used privalloc(2). Aside from making the code more standard, this change drastically simplifies it, both for 386 and for amd64, and makes the Plan 9 code in liblink common for both 386 and amd64. The amd64 runtime code was cleared of nxm assumptions, and now runs on the standard Plan 9 kernel. Note handling fixes will follow in a separate CL. LGTM=rsc R=golang-codereviews, rsc, bradfitz, dave CC=0intro, ality, golang-codereviews, jas, minux.ma, mischief https://golang.org/cl/101510049
24 lines
572 B
ArmAsm
24 lines
572 B
ArmAsm
// Copyright 2010 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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#include "../../cmd/ld/textflag.h"
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TEXT _rt0_386_plan9(SB),NOSPLIT,$12
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MOVL AX, _tos(SB)
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LEAL 8(SP), AX
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MOVL AX, _privates(SB)
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MOVL $1, _nprivates(SB)
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CALL runtime·asminit(SB)
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MOVL inargc-4(FP), AX
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MOVL AX, 0(SP)
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LEAL inargv+0(FP), AX
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MOVL AX, 4(SP)
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CALL _rt0_go(SB)
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DATA runtime·isplan9(SB)/4, $1
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GLOBL runtime·isplan9(SB), $4
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GLOBL _tos(SB), $4
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GLOBL _privates(SB), $4
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GLOBL _nprivates(SB), $4
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