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cmd/link/internal/arm: off-by-one error in trampoline phase call reachability calculation [1.20 backport] #59059

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gopherbot opened this issue Mar 15, 2023 · 2 comments
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cmd/link/internal/arm: off-by-one error in trampoline phase call reachability calculation [1.20 backport] #59059

gopherbot opened this issue Mar 15, 2023 · 2 comments
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CherryPickApproved Used during the release process for point releases FrozenDueToAge
Milestone
Go1.20.3

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@gopherbot
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@thanm requested issue #59034 to be considered for backport to the next 1.20 minor release.

@gopherbot please open backport issues
@gopherbot gopherbot added the CherryPickCandidate Used during the release process for point releases label Mar 15, 2023
@gopherbot gopherbot mentioned this issue Mar 15, 2023
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@gopherbot gopherbot added this to the Go1.20.3 milestone Mar 15, 2023
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Change https://go.dev/cl/476936 mentions this issue: [release-branch.go1.20] cmd/link/internal/arm: fix off-by-1 in trampoline reachability computation

@liggitt liggitt mentioned this issue Mar 20, 2023
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@heschi heschi added the CherryPickApproved Used during the release process for point releases label Mar 22, 2023
@gopherbot gopherbot removed the CherryPickCandidate Used during the release process for point releases label Mar 22, 2023
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Closed by merging b52a696 to release-branch.go1.20.

gopherbot pushed a commit that referenced this issue Mar 22, 2023
@thanm @heschi
[release-branch.go1.20] cmd/link/internal/arm: fix off-by-1 in trampo…
b52a696 
…line reachability computation

Tweak the code in trampoline generation that determines if a given
call branch will reach, changing the lower limit guard from "x <
-0x800000" to "x <= -0x800000". This is to resolve linking failures
when the computed displacement is exactly -0x800000, which results in
errors of the form

  .../ld.gold: internal error in arm_branch_common, at ../../gold/arm.cc:4079

when using the Gold linker, and

  ...:(.text+0x...): relocation truncated to fit: R_ARM_CALL against `runtime.morestack_noctxt'

when using the bfd linker.

Fixes #59059.
Updates #59034.
Updates #58425.

Change-Id: I8a76986b38727df1b961654824c2af23f06b9fcf
Reviewed-on: https://go-review.googlesource.com/c/go/+/475957
Run-TryBot: Than McIntosh <thanm@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
(cherry picked from commit f26bf20)
Reviewed-on: https://go-review.googlesource.com/c/go/+/476936
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