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runtime: change amd64 startup convention

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Now the default startup is that the program begins at _rt0_amd64_$GOOS,
which sets DI = argc, SI = argv and jumps to _rt0_amd64.

This makes the _rt0_amd64 entry match the expected semantics for
the standard C "main" function, which we can now provide for use when
linking against a standard C library.

R=golang-dev, devon.odell, minux.ma
CC=golang-dev
https://golang.org/cl/7525043
This commit is contained in:
Russ Cox 2013-03-06 15:03:04 -05:00
parent cf8434fa31
commit 36b414f639
8 changed files with 51 additions and 25 deletions
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4
src/pkg/runtime/asm_amd64.s
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@ -6,8 +6,8 @@
TEXT _rt0_amd64(SB),7,$-8
// copy arguments forward on an even stack
MOVQ 0(DI), AX // argc
LEAQ 8(DI), BX // argv
MOVQ DI, AX // argc
MOVQ SI, BX // argv
SUBQ $(4*8+7), SP // 2args 2auto
ANDQ $~15, SP
MOVQ AX, 16(SP)

11
src/pkg/runtime/rt0_darwin_amd64.s
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@ -2,9 +2,12 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Darwin and Linux use the same linkage to main
TEXT _rt0_amd64_darwin(SB),7,$-8
MOVQ $_rt0_amd64(SB), AX
MOVQ SP, DI
LEAQ 8(SP), SI // argv
MOVQ 0(SP), DI // argc
MOVQ $main(SB), AX
JMP AX
TEXT main(SB),7,$-8
MOVQ $_rt0_amd64(SB), AX
JMP AX

12
src/pkg/runtime/rt0_freebsd_amd64.s
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@ -2,8 +2,12 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Darwin and Linux use the same linkage to main
TEXT _rt0_amd64_freebsd(SB),7,$-8
MOVQ $_rt0_amd64(SB), DX
JMP DX
LEAQ 8(DI), SI // argv
MOVQ 0(DI), DI // argc
MOVQ $main(SB), AX
JMP AX
TEXT main(SB),7,$-8
MOVQ $_rt0_amd64(SB), AX
JMP AX

11
src/pkg/runtime/rt0_linux_amd64.s
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@ -2,9 +2,12 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Darwin and Linux use the same linkage to main
TEXT _rt0_amd64_linux(SB),7,$-8
MOVQ $_rt0_amd64(SB), AX
MOVQ SP, DI
LEAQ 8(SP), SI // argv
MOVQ 0(SP), DI // argc
MOVQ $main(SB), AX
JMP AX
TEXT main(SB),7,$-8
MOVQ $_rt0_amd64(SB), AX
JMP AX

13
src/pkg/runtime/rt0_netbsd_amd64.s
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@ -2,7 +2,12 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
TEXT _rt0_amd64_netbsd(SB),7,$-8
MOVQ $_rt0_amd64(SB), DX
MOVQ SP, DI
JMP DX
TEXT _rt0_amd64_openbsd(SB),7,$-8
LEAQ 8(SP), SI // argv
MOVQ 0(SP), DI // argc
MOVQ $main(SB), AX
JMP AX
TEXT main(SB),7,$-8
MOVQ $_rt0_amd64(SB), AX
JMP AX

11
src/pkg/runtime/rt0_openbsd_amd64.s
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@ -3,6 +3,11 @@
// license that can be found in the LICENSE file.
TEXT _rt0_amd64_openbsd(SB),7,$-8
MOVQ $_rt0_amd64(SB), DX
MOVQ SP, DI
JMP DX
LEAQ 8(SP), SI // argv
MOVQ 0(SP), DI // argc
MOVQ $main(SB), AX
JMP AX
TEXT main(SB),7,$-8
MOVQ $_rt0_amd64(SB), AX
JMP AX

5
src/pkg/runtime/rt0_plan9_amd64.s
View File

@ -2,9 +2,10 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
TEXT _rt0_amd64_plan9(SB),7, $0
TEXT _rt0_amd64_plan9(SB),7,$-8
LEAQ 8(SP), SI // argv
MOVQ 0(SP), DI // argc
MOVQ $_rt0_amd64(SB), AX
MOVQ SP, DI
JMP AX
DATA runtime·isplan9(SB)/4, $1

9
src/pkg/runtime/rt0_windows_amd64.s
View File

@ -4,9 +4,14 @@
#include "zasm_GOOS_GOARCH.h"
TEXT _rt0_amd64_windows(SB),7,$-8
TEXT _rt0_amd64_darwin(SB),7,$-8
LEAQ 8(SP), SI // argv
MOVQ 0(SP), DI // argc
MOVQ $main(SB), AX
JMP AX
TEXT main(SB),7,$-8
MOVQ $_rt0_amd64(SB), AX
MOVQ SP, DI
JMP AX
DATA runtime·iswindows(SB)/4, $1