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[dev.typeparams] runtime: call cgocallbackg indirectly on ARM64

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This is CL 312669, for ARM64.

cgocallback calls cgocallbackg after switching the stack. Call it
indirectly to bypass the linker's nosplit check. In particular,
this avoids a nosplit stack overflow on Windows when register ABI
is enabled.

Change-Id: I7054a750fb0ec2579d46004f94b46b6f7b9e3a21
Reviewed-on: https://go-review.googlesource.com/c/go/+/324734
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
This commit is contained in:
Cherry Mui 2021-06-02 19:43:28 -04:00
parent 5a40fab19f
commit 3de4986852
1 changed files with 2 additions and 1 deletions
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3
src/runtime/asm_arm64.s
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@ -1196,7 +1196,8 @@ havem:
MOVD R1, 8(RSP)
MOVD R2, 16(RSP)
MOVD R3, 24(RSP)
BL runtime·cgocallbackg(SB)
MOVD $runtime·cgocallbackg(SB), R0
CALL (R0) // indirect call to bypass nosplit check. We're on a different stack now.
// Restore g->sched (== m->curg->sched) from saved values.
MOVD 0(RSP), R5