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Unverified Commit 744f4be5 authored by Paul Burton's avatar Paul Burton
Browse files

rseq/selftests: Implement MIPS support 



Implement support for both MIPS32 & MIPS64 in the rseq selftests, in
order to sanity check the recently enabled rseq syscall.

The tests all pass on a MIPS Boston development board running either a
MIPS32r2 interAptiv CPU & a MIPS64r6 I6500 CPU, both of which were
configured with 2 cores each of which have 2 hardware threads (VP(E)s) -
ie. 4 CPUs.

Signed-off-by: default avatarPaul Burton <paul.burton@mips.com>
Reviewed-by: default avatarJames Hogan <jhogan@kernel.org>
Patchwork: https://patchwork.linux-mips.org/patch/19524/
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
parent e426b375

tools/testing/selftests/rseq/param_test.c

+24 −0
Original line number Diff line number Diff line
@@ -137,6 +137,30 @@ unsigned int yield_mod_cnt, nr_abort; 
	"subic. %%" INJECT_ASM_REG ", %%" INJECT_ASM_REG ", 1\n\t" \

	"bne 222b\n\t" \

	"333:\n\t"



#elif defined(__mips__)



#define RSEQ_INJECT_INPUT \

	, [loop_cnt_1]"m"(loop_cnt[1]) \

	, [loop_cnt_2]"m"(loop_cnt[2]) \

	, [loop_cnt_3]"m"(loop_cnt[3]) \

	, [loop_cnt_4]"m"(loop_cnt[4]) \

	, [loop_cnt_5]"m"(loop_cnt[5]) \

	, [loop_cnt_6]"m"(loop_cnt[6])



#define INJECT_ASM_REG	"$5"



#define RSEQ_INJECT_CLOBBER \

	, INJECT_ASM_REG



#define RSEQ_INJECT_ASM(n) \

	"lw " INJECT_ASM_REG ", %[loop_cnt_" #n "]\n\t" \

	"beqz " INJECT_ASM_REG ", 333f\n\t" \

	"222:\n\t" \

	"addiu " INJECT_ASM_REG ", -1\n\t" \

	"bnez " INJECT_ASM_REG ", 222b\n\t" \

	"333:\n\t"



#else

#error unsupported target

#endif

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

0 → 100644
+725 −0

File added.

Preview size limit exceeded, changes collapsed.

tools/testing/selftests/rseq/rseq.h

+2 −0
Original line number Diff line number Diff line
@@ -73,6 +73,8 @@ extern __thread volatile struct rseq __rseq_abi; 
#include <rseq-arm.h>

#elif defined(__PPC__)

#include <rseq-ppc.h>

#elif defined(__mips__)

#include <rseq-mips.h>

#else

#error unsupported target

#endif