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kernel
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linux
selftests/powerpc: Properly handle failure in switch_endian_test
On older CPUs the switch_endian() syscall doesn't work. Currently that
causes the switch_endian_test to just crash. Instead detect the
failure and properly exit with a failure message.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200819015727.1977134-9-mpe@ellerman.id.au
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tools/testing/selftests/powerpc/switch_endian/switch_endian_test.S
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tools/testing/selftests/powerpc/switch_endian/switch_endian_test.S
···
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.data
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.balign 8
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message:
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success_message:
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.ascii "success: switch_endian_test\n\0"
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.balign 8
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failure_message:
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.ascii "failure: switch_endian_test\n\0"
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.section ".toc"
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.balign 8
···
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li r0, __NR_switch_endian
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sc
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tdi 0, 0, 0x48 // b +8 if the endian was switched
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b .Lfail // exit if endian didn't switch
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#include "check-reversed.S"
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/* Flip back, r0 already has the switch syscall number */
···
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#include "check.S"
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ld r4, success_message@got(%r2)
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li r5, 28 // strlen(success_message)
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li r14, 0 // exit status
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.Lout:
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li r0, __NR_write
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li r3, 1 /* stdout */
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ld r4, message@got(%r2)
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li r5, 28 /* strlen(message3) */
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sc
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li r0, __NR_exit
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li r3, 0
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mr r3, r14
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sc
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b .
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.Lfail:
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ld r4, failure_message@got(%r2)
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li r5, 28 // strlen(failure_message)
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li r14, 1
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b .Lout