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runtime: use %gs:0x30 for TLS on macOS #23617

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rsc opened this issue Jan 30, 2018 · 6 comments
Closed

runtime: use %gs:0x30 for TLS on macOS #23617

rsc opened this issue Jan 30, 2018 · 6 comments
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FrozenDueToAge NeedsFix The path to resolution is known, but the work has not been done.
Milestone
Go1.11

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@rsc
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rsc commented Jan 30, 2018

Per private email discussion with Anthony Chivetta of Apple, Go should stop guessing pthread offsets and instead hard-code 0x30 off %gs as the g register. That location is already reserved for WINE and Win64, so as long as we're not trying to run Win64 code linked into macOS binaries, all will be well.
@rsc rsc added this to the Go1.11 milestone Jan 30, 2018
@rsc rsc self-assigned this Jan 30, 2018
@bradfitz bradfitz added the NeedsFix The path to resolution is known, but the work has not been done. label Jan 30, 2018
@randall77
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Q: 0x30 for amd64? What about 386, arm, arm64?

Is there any way we can get Apple to commit this offset for Go? I understand it is currently reserved, but if they are willing to give it out to us they might also give it out to some other Foo project. Then a binary with both Go and Foo in it wouldn't work.

@ianlancetaylor
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Apple has committed that we can use the 0x30 offset for amd64, on the assumption that we will never link Go and Windows code together while running on Darwin.

I sent an e-mail asking about the other platforms.

@gopherbot
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Change https://golang.org/cl/105975 mentions this issue: runtime: use fixed TLS offsets on darwin/amd64 and darwin/386

@randall77 randall77 mentioned this issue Apr 10, 2018
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@gopherbot
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Change https://golang.org/cl/106156 mentions this issue: runtime: use fixed TLS offsets on darwin/amd64 and darwin/386

gopherbot pushed a commit that referenced this issue Apr 11, 2018
@randall77
runtime: use fixed TLS offsets on darwin/amd64 and darwin/386
b3a854c 
Fixes #23617

Note that this CL does not affect darwin/arm and darwin/arm64,
still TBD what, if anything, needs to be done for those.

This is a fix of CL 105975 which was reverted in CL 106155.
Needed to use movl instead of movq for 386.

Change-Id: I0db7f8087173869e60cc22c6c3124fa0a0739b46
Reviewed-on: https://go-review.googlesource.com/106156
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
@toffaletti
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Any plans for this change to make it into 1.10.x?

@randall77
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No. Is there a reason you want it?

aarzilli added a commit to aarzilli/delve that referenced this issue Apr 14, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
0979d01 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue Apr 14, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
356919e 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue Apr 19, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
116637f 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue Apr 19, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
014809d 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue Apr 19, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
4a730c1 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue May 3, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
374b1cd 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue May 8, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
722ae54 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue May 14, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
6123f23 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue May 17, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
84cf7c6 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue May 21, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
5c21207 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue May 23, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
a460dbb 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue May 24, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
3835257 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue May 25, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
43f7a8f 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue May 25, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
24f6205 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
aarzilli added a commit to aarzilli/delve that referenced this issue Jun 11, 2018
@aarzilli
proc: correctly set G struct offset for 1.11
baec689 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
derekparker pushed a commit to go-delve/delve that referenced this issue Jun 11, 2018
@aarzilli @derekparker
proc: correctly set G struct offset for 1.11
42747a0 
The offset of G changed in go1.11 from 0x8a0 to 0x30. See:
golang/go#23617
@rprichard rprichard mentioned this issue Mar 26, 2019
Closed
@golang golang locked and limited conversation to collaborators Apr 11, 2019
@rsc rsc removed their assignment Jun 23, 2022
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