| commit | 4751db93ef23c87c0fa2f06433555b7084f339bd | [log] [tgz] |
|---|---|---|
| author | Cherry Zhang <cherryyz@google.com> | Tue Oct 29 20:40:26 2019 -0400 |
| committer | Cherry Zhang <cherryyz@google.com> | Thu Nov 07 20:34:27 2019 +0000 |
| tree | eeaae78bd24959bc80c65fe006c40292ee208452 | |
| parent | 689f6f77f0d54b597ebc82e9bc4a8e1a59bce04d [diff] |
cmd/internal/obj/s390x: mark unsafe points For async preemption, we will be using REGTMP as a temporary register in injected call on S390X, which will clobber it. So any code that uses REGTMP is not safe for async preemption. In the assembler backend, we expand a Prog to multiple machine instructions and use REGTMP as a temporary register if necessary. These need to be marked unsafe. Unlike ARM64 and MIPS, instructions on S390X are variable length so we don't use the length as a condition. Instead, we set a bit on the Prog whenever REGTMP is used. Change-Id: Ie5d14068a950f4c7cea51dff2c4a8bdc19ec9348 Reviewed-on: https://go-review.googlesource.com/c/go/+/204105 Run-TryBot: Cherry Zhang <cherryyz@google.com> Reviewed-by: Keith Randall <khr@golang.org>
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