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[dev.regabi] runtime: zero X15 in racecall

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racecall can be called in ABIInternal context (e.g. raceread
calling racecalladdr calling racecall) without wrapper. racecall
calls C code, which doesn't preserve our special registers. Set
them explicitly in racecall upon returning from C.

Change-Id: Ic990479c1fca6bb8a3b151325c7a89be8331a530
Reviewed-on: https://go-review.googlesource.com/c/go/+/289709
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This commit is contained in:
Cherry Zhang 2021-02-02 18:25:39 -05:00
parent 397a46a10a
commit 946351d5a2
1 changed files with 3 additions and 0 deletions
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3
src/runtime/race_amd64.s
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@ -412,6 +412,9 @@ call:
ANDQ $~15, SP // alignment for gcc ABI
CALL AX
MOVQ R12, SP
// Back to Go world, set special registers.
// The g register (R14) is preserved in C.
XORPS X15, X15
RET
// C->Go callback thunk that allows to call runtime·racesymbolize from C code.