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runtime: increase freebsd/amd64 pointer size from 48 to 57 bits 

Because freebsd is now enabling la57 by default.

Fixes #49405

Change-Id: I30f7bac8b8a9baa85e0c097e06072c19ad474e5a
Reviewed-on: https://go-review.googlesource.com/c/go/+/670715
Auto-Submit: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
khr@golang.org 2025-05-07 14:34:30 -07:00 committed by Gopher Robot
parent c62099cfac
commit 5bbac667c5
1 changed files with 4 additions and 1 deletions
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5
src/runtime/tagptr_64bit.go
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@ -34,13 +34,16 @@ const (
// We use one bit to distinguish between the two ranges.
aixAddrBits = 57
// Later versions of FreeBSD enable amd64's la57 by default.
freebsdAmd64AddrBits = 57
// riscv64 SV57 mode gives 56 bits of userspace VA.
// tagged pointer code supports it,
// but broader support for SV57 mode is incomplete,
// and there may be other issues (see #54104).
riscv64AddrBits = 56
addrBits = goos.IsAix*aixAddrBits + goarch.IsRiscv64*riscv64AddrBits + (1-goos.IsAix)*(1-goarch.IsRiscv64)*defaultAddrBits
addrBits = goos.IsAix*aixAddrBits + goarch.IsRiscv64*riscv64AddrBits + goos.IsFreebsd*goarch.IsAmd64*freebsdAmd64AddrBits + (1-goos.IsAix)*(1-goarch.IsRiscv64)*(1-goos.IsFreebsd*goarch.IsAmd64)*defaultAddrBits
// In addition to the 16 bits (or other, depending on arch/os) taken from the top,
// we can take 9 from the bottom, because we require pointers to be well-aligned