Commit 003d6f5f authored by Michael Ellerman's avatar Michael Ellerman
Browse files

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: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200819015727.1977134-9-mpe@ellerman.id.au
parent 09275d71

tools/testing/selftests/powerpc/switch_endian/switch_endian_test.S

+19 −4
Original line number Diff line number Diff line
@@ -3,9 +3,13 @@ 


	.data

	.balign 8

message:

success_message:

	.ascii "success: switch_endian_test\n\0"



	.balign 8

failure_message:

	.ascii "failure: switch_endian_test\n\0"



	.section ".toc"

	.balign 8

pattern:
@@ -64,6 +68,9 @@ FUNC_START(_start) 
	li r0, __NR_switch_endian

	sc



	tdi   0, 0, 0x48	// b +8 if the endian was switched

	b     .Lfail	  	// exit if endian didn't switch



#include "check-reversed.S"



	/* Flip back, r0 already has the switch syscall number */
@@ -71,12 +78,20 @@ FUNC_START(_start) 


#include "check.S"



	ld	r4, success_message@got(%r2)

	li	r5, 28	// strlen(success_message)

	li	r14, 0	// exit status

.Lout:

	li	r0, __NR_write

	li	r3, 1	/* stdout */

	ld	r4, message@got(%r2)

	li	r5, 28	/* strlen(message3) */

	sc

	li      r0, __NR_exit

	li	r3, 0

	mr	r3, r14

	sc

	b       .



.Lfail:

	ld	r4, failure_message@got(%r2)

	li	r5, 28	// strlen(failure_message)

	li	r14, 1

	b	.Lout