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author | Austin Clements <austin@google.com> | 2021-04-13 08:44:56 -0400 |
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committer | Austin Clements <austin@google.com> | 2021-04-13 21:13:12 +0000 |
commit | c19759aa487f7d6f479daa00e7462425f4efc481 (patch) | |
tree | a580e1b01eeb2ecdb81d383e922ad8bb155095b5 /src/runtime/memclr_amd64.s | |
parent | e69f02265c74529a368a2ff27fdce4aeb3483e8b (diff) | |
download | go-c19759aa487f7d6f479daa00e7462425f4efc481.tar.gz go-c19759aa487f7d6f479daa00e7462425f4efc481.zip |
runtime: eliminate externalthreadhandler
This function is no longer used.
Eliminating this actually fixes several problems:
- It made assumptions about what registers memclrNoHeapPointers would
preserve. Besides being an abstraction violation and lurking
maintenance issue, this actively became a problem for regabi because
the call to memclrNoHeapPointers now happens through an ABI wrapper,
which is generated by the compiler and hence we can't easily control
what registers it clobbers.
- The amd64 implementation (at least), does not interact with the host
ABI correctly. Notably, it doesn't save many of the registers that
are callee-save in the host ABI but caller-save in the Go ABI.
- It interacts strangely with the NOSPLIT checker because it allocates
an entire M and G on its stack. It worked around this on arm64, and
happened to do things the NOSPLIT checker couldn't track on 386 and
amd64, and happened to be *4 bytes* below the limit on arm (so any
addition to the m or g structs would cause a NOSPLIT failure). See
CL 309031 for a more complete explanation.
Fixes #45530.
Updates #40724.
Change-Id: Ic70d4d7e1c17f1d796575b3377b8529449e93576
Reviewed-on: https://go-review.googlesource.com/c/go/+/309634
Trust: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Diffstat (limited to 'src/runtime/memclr_amd64.s')
-rw-r--r-- | src/runtime/memclr_amd64.s | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/src/runtime/memclr_amd64.s b/src/runtime/memclr_amd64.s index b4bc9988ec..5d2bebb901 100644 --- a/src/runtime/memclr_amd64.s +++ b/src/runtime/memclr_amd64.s @@ -7,8 +7,6 @@ #include "go_asm.h" #include "textflag.h" -// NOTE: Windows externalthreadhandler expects memclr to preserve DX. - // See memclrNoHeapPointers Go doc for important implementation constraints. // func memclrNoHeapPointers(ptr unsafe.Pointer, n uintptr) |