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runtime: use explicit NOFRAME on plan9/amd64

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This CL marks some plan9 assembly functions as NOFRAME to avoid
relying on the implicit amd64 NOFRAME heuristic, where NOSPLIT functions
without stack were also marked as NOFRAME.

Updates #58378

Change-Id: Ic8c9ab5c1a0897bebc6c1419ddc903a7492a1b0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/466457
TryBot-Bypass: Quim Muntal <quimmuntal@gmail.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
qmuntal 2023-02-08 16:47:16 +01:00 committed by Quim Muntal
parent a4b66b14e2
commit ea75b9458f
2 changed files with 2 additions and 2 deletions
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2
src/cmd/internal/obj/x86/obj6.go
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@ -617,7 +617,7 @@ func preprocess(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
var usefpheuristic bool
switch ctxt.Headtype {
case objabi.Hwindows, objabi.Hdarwin, objabi.Hlinux, objabi.Hdragonfly,
objabi.Hfreebsd, objabi.Hnetbsd, objabi.Hopenbsd, objabi.Hsolaris:
objabi.Hfreebsd, objabi.Hnetbsd, objabi.Hopenbsd, objabi.Hsolaris, objabi.Hplan9:
default:
usefpheuristic = true
}

2
src/runtime/sys_plan9_amd64.s
View File

@ -166,7 +166,7 @@ TEXT runtime·settls(SB),NOSPLIT,$0
RET
// void sigtramp(void *ureg, int8 *note)
TEXT runtime·sigtramp(SB),NOSPLIT,$0
TEXT runtime·sigtramp(SB),NOSPLIT|NOFRAME,$0
get_tls(AX)
// check that g exists