[dev.simd] all: merge master (d70ad4e) into dev.simd

Conflicts:

- src/cmd/compile/internal/types2/stdlib_test.go
- src/go/types/stdlib_test.go

Merge List:

+ 2025-09-25 d70ad4e740 sync/atomic: correct Uintptr.Or return doc
+ 2025-09-25 d7abfe4f0d runtime: acquire/release C TSAN lock when calling cgo symbolizer/tracebacker
+ 2025-09-25 393d91aea0 cmd/fix: remove all functionality
+ 2025-09-25 6dceff8bad cmd/link: handle -w flag in external linking mode
+ 2025-09-25 76d088eb74 cmd/internal/obj/riscv: remove ACFLWSP/ACFSWSP and ACFLW/ACFSW
+ 2025-09-25 5225e9dc49 doc/next: document new image/jpeg DCT in release notes
+ 2025-09-25 81a83bba21 cmd: update x/tools@4df13e3
+ 2025-09-25 6b32c613ca go/types: make typeset return an iterator
+ 2025-09-25 fbba930271 image/jpeg: replace fdct.go and idct.go with new implementation in dct.go
+ 2025-09-25 92e093467f image/jpeg: correct and test reference slowFDCT and slowIDCT
+ 2025-09-25 27c7bbc51c image/jpeg: prepare for new FDCT/IDCT implementations
+ 2025-09-24 f15cd63ec4 cmd/compile: don't rely on loop info when there are irreducible loops
+ 2025-09-24 371c1d2fcb cmd/internal/obj/riscv: add support for vector unit-stride fault-only-first load instructions
+ 2025-09-23 411c250d64 runtime: add specialized malloc functions for sizes up to 512 bytes
+ 2025-09-23 d7a38adf4c runtime: eliminate global span queue [green tea]
+ 2025-09-23 7bc1935db5 cmd/compile/internal: support new(expr)
+ 2025-09-23 eb78f13c9f doc/go_spec.html: document new(expr)
+ 2025-09-23 74cc463f9e go/token: add TestRemovedFileFileReturnsNil test
+ 2025-09-23 902dc27ae9 go/token: clear cache after grabbing the mutex in RemoveFile
+ 2025-09-23 a13d085a5b cmd/cgo: don't hardcode section name in TestNumberOfExportedFunctions
+ 2025-09-23 61bf26a9ee cmd/link: fix Macho-O X86_64_RELOC_SUBTRACTOR in internal linking
+ 2025-09-23 4b787c8c2b reflect: remove stale comment in unpackEface
+ 2025-09-23 3df27cd21a cmd/compile: fix typo in comment
+ 2025-09-23 684e8d3363 reflect: allocate memory in TypeAssert[I] only when the assertion succeeds
+ 2025-09-23 a5866ebe40 cmd/compile: prevent shapifying of pointer shape type
+ 2025-09-23 a27261c42f go/types,types2: allow new(expr)
+ 2025-09-23 e93f439ac4 runtime/cgo: retry when CreateThread fails with ERROR_ACCESS_DENIED
+ 2025-09-23 69e74b0aac runtime: deduplicate pMask resize code
+ 2025-09-23 fde10c4ce7 runtime: split gcMarkWorkAvailable into two separate conditions
+ 2025-09-23 5d040df092 runtime: use scan kernels in scanSpan [green tea]
+ 2025-09-23 7e0251bf58 runtime: don't report non-blocked goroutines as "(durable)" in stacks
+ 2025-09-23 22ac328856 cmd/link: make -w behavior consistent on Windows

Change-Id: Id76b5a30a3b6f6669437f97e3320c9bca65a1e96

1 files changed, 45 insertions, 0 deletions

diff --git a/src/runtime/testdata/testprog/setcgotraceback.go b/src/runtime/testdata/testprog/setcgotraceback.go
new file mode 100644
index 0000000000..de005027ec
--- /dev/null
+++ b/src/runtime/testdata/testprog/setcgotraceback.go
@@ -0,0 +1,45 @@
+// Copyright 2025 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+	"internal/abi"
+	"runtime"
+	"unsafe"
+)
+
+func init() {
+	register("SetCgoTracebackNoCgo", SetCgoTracebackNoCgo)
+}
+
+func cgoTraceback() {
+	panic("unexpectedly reached cgo traceback function")
+}
+
+func cgoContext() {
+	panic("unexpectedly reached cgo context function")
+}
+
+func cgoSymbolizer() {
+	panic("unexpectedly reached cgo symbolizer function")
+}
+
+// SetCgoTraceback is a no-op in non-cgo binaries.
+func SetCgoTracebackNoCgo() {
+	traceback := unsafe.Pointer(abi.FuncPCABIInternal(cgoTraceback))
+	context := unsafe.Pointer(abi.FuncPCABIInternal(cgoContext))
+	symbolizer := unsafe.Pointer(abi.FuncPCABIInternal(cgoSymbolizer))
+	runtime.SetCgoTraceback(0, traceback, context, symbolizer)
+
+	// In a cgo binary, runtime.(*Frames).Next calls the cgo symbolizer for
+	// any non-Go frames. Pass in a bogus frame to verify that Next does
+	// not attempt to call the cgo symbolizer, which would crash in a
+	// non-cgo binary like this one.
+	frames := runtime.CallersFrames([]uintptr{0x12345678})
+	frames.Next()
+
+	fmt.Println("OK")
+}