| commit | a930fede7386fd3583553b523fd6f7fa5fef1244 | [log] [tgz] |
|---|---|---|
| author | Cherry Zhang <cherryyz@google.com> | Sat Oct 26 22:54:28 2019 -0400 |
| committer | Cherry Zhang <cherryyz@google.com> | Thu Nov 07 20:59:14 2019 +0000 |
| tree | 73081ff2104bd49d8b6cfed4e54f57d08c533d92 | |
| parent | a120cc8b365be33d3f82bbf8b79584e0e3439b9b [diff] |
runtime: add async preemption support on MIPS and MIPS64 This CL adds support of call injection and async preemption on MIPS and MIPS64. Like ARM64, we need to clobber one register (REGTMP) for returning from the injected call. Previous CLs have marked code sequences that use REGTMP async-nonpreemtible. It seems on MIPS/MIPS64, a CALL instruction is not "atomic" (!). If a signal is delivered right at the CALL instruction, we may see an updated LR with a not-yet-updated PC. In some cases this may lead to failed stack unwinding. Don't preempt in this case. Change-Id: I99437b2d05869ded5c0c8cb55265dbfc933aedab Reviewed-on: https://go-review.googlesource.com/c/go/+/203720 Reviewed-by: Keith Randall <khr@golang.org>
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