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runtime: use proper C ABI for race call on PPC64LE
On PPC64LE, the C ABI requires SP to be 16-byte aligned. Also, in the C ABI the callee may save LR, CR, R2 etc. to the 4 reserved words of the caller's frame. This CL aligns the SP and reserves the space on stack. Change-Id: I738880028815b7d3402647e4ebbdae37f45acc77 Reviewed-on: https://go-review.googlesource.com/c/go/+/397675 Trust: Cherry Mui <cherryyz@google.com> Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Cherry Mui <cherryyz@google.com> TryBot-Result: Gopher Robot <gobot@golang.org>
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@ -442,6 +442,9 @@ TEXT racecall<>(SB), NOSPLIT, $0-0
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BEQ call // already on g0
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MOVD (g_sched+gobuf_sp)(R10), R1 // switch R1
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call:
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// prepare frame for C ABI
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SUB $32, R1 // create frame for callee saving LR, CR, R2 etc.
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RLDCR $0, R1, $~15, R1 // align SP to 16 bytes
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MOVD R8, CTR // R8 = caller addr
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MOVD R8, R12 // expected by PPC64 ABI
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BL (CTR)
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