s390/rseq: use trap4 for RSEQ_SIG (e24e4712) · Commits · 戴 / test

tools/testing/selftests/rseq/rseq-s390.h

+8 −1

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		/* SPDX-License-Identifier: LGPL-2.1 OR MIT */

		#define RSEQ_SIG 0x53053053
		/*
		* RSEQ_SIG uses the trap4 instruction. As Linux does not make use of the
		* access-register mode nor the linkage stack this instruction will always
		* cause a special-operation exception (the trap-enabled bit in the DUCT
		* is and will stay 0). The instruction pattern is
		* b2 ff 0f ff trap4 4095(%r0)
		*/
		#define RSEQ_SIG 0xB2FF0FFF

		#define rseq_smp_mb() __asm__ __volatile__ ("bcr 15,0" ::: "memory")
		#define rseq_smp_rmb() rseq_smp_mb()