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| author | Michael Pratt <mpratt@google.com> | 2025-05-21 11:10:24 -0400 |
|---|---|---|
| committer | Gopher Robot <gobot@golang.org> | 2025-05-21 11:05:32 -0700 |
| commit | d2f229db7a3da4157fd7602f77513ce85c01ff04 (patch) | |
| tree | c7f8a419e439ed80502f0aeae0722badec1fc0f7 /src | |
| parent | 304d9e2fd1b62d236eb48ec838be3680cb7845e6 (diff) | |
| download | go-d2f229db7a3da4157fd7602f77513ce85c01ff04.tar.xz | |
runtime: avoid register clobber in s390x racecall
This is a regression in CL 643875. Loading gsignal clobbers R8, which
contains the m pointer needed for loading g0.
For #71395.
Change-Id: I6a6a636ca95442767efe0eb1b358f2139d18c5b8
Reviewed-on: https://go-review.googlesource.com/c/go/+/675035
Auto-Submit: Michael Pratt <mpratt@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Diffstat (limited to 'src')
| -rw-r--r-- | src/runtime/race_s390x.s | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/src/runtime/race_s390x.s b/src/runtime/race_s390x.s index a12bf8416b..3dfda9e733 100644 --- a/src/runtime/race_s390x.s +++ b/src/runtime/race_s390x.s @@ -412,13 +412,13 @@ TEXT racecall<>(SB), NOSPLIT, $0-0 MOVD g_m(g), R8 // R8 = thread. // Switch to g0 stack if we aren't already on g0 or gsignal. - MOVD m_gsignal(R8), R8 - CMPBEQ R8, g, call + MOVD m_gsignal(R8), R9 + CMPBEQ R9, g, call - MOVD m_g0(R8), R8 - CMPBEQ R8, g, call + MOVD m_g0(R8), R9 + CMPBEQ R9, g, call - MOVD (g_sched+gobuf_sp)(R8), R15 // Switch SP to g0. + MOVD (g_sched+gobuf_sp)(R9), R15 // Switch SP to g0. call: SUB $160, R15 // Allocate C frame. BL R1 // Call C code. |