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Commit 4cd968ef authored by Michael Ellerman's avatar Michael Ellerman
Browse files

selftests/powerpc: Add a test of the switch_endian() syscall 



This adds a test of the switch_endian() syscall we added in the previous
commit.

We test it by calling the endian switch syscall, and then executing some
code in the other endian to check everything went as expected. That code
checks registers we expect to be maintained are. If the endian switch
failed to happen that code sequence will be illegal and cause the test
to abort.

We then switch back to the original endian, do the same checks and
finally write a success message and exit(0).

Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 529d235a

tools/testing/selftests/powerpc/Makefile

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@@ -13,7 +13,7 @@ CFLAGS := -Wall -O2 -flto -Wall -Werror -DGIT_VERSION='"$(GIT_VERSION)"' -I$(CUR 


export CC CFLAGS



SUB_DIRS = pmu copyloops mm tm primitives stringloops vphn

SUB_DIRS = pmu copyloops mm tm primitives stringloops vphn switch_endian



endif

tools/testing/selftests/powerpc/switch_endian/.gitignore

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switch_endian_test

check-reversed.S

tools/testing/selftests/powerpc/switch_endian/Makefile

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CC := $(CROSS_COMPILE)gcc

PROGS := switch_endian_test



ASFLAGS += -O2 -Wall -g -nostdlib -m64



all: $(PROGS)



switch_endian_test: check-reversed.S



check-reversed.o: check.o

	$(CROSS_COMPILE)objcopy -j .text --reverse-bytes=4 -O binary $< $@



check-reversed.S: check-reversed.o

	hexdump -v -e '/1 ".byte 0x%02X\n"' $< > $@



run_tests: all

	@-for PROG in $(PROGS); do \

		./$$PROG; \

	done;



clean:

	rm -f $(PROGS) *.o check-reversed.S



.PHONY: all run_tests clean

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

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#include "common.h"



/*

 * Checks that registers contain what we expect, ie. they were not clobbered by

 * the syscall.

 *

 * r15: pattern to check registers against.

 *

 * At the end r3 == 0 if everything's OK.

 */

	nop			# guaranteed to be illegal in reverse-endian

	mr	r9,r15

	cmpd    r9,r3		# check r3

	bne     1f

	addi    r9,r15,4	# check r4

	cmpd    r9,r4

	bne     1f

	lis     r9,0x00FF	# check CR

	ori     r9,r9,0xF000

	mfcr    r10

	and     r10,r10,r9

	cmpw    r9,r10

	addi    r9,r15,34

	bne     1f

	addi    r9,r15,32	# check LR

	mflr    r10

	cmpd    r9,r10

	bne     1f

	addi    r9,r15,5	# check r5

	cmpd    r9,r5

	bne     1f

	addi    r9,r15,6	# check r6

	cmpd    r9,r6

	bne     1f

	addi    r9,r15,7	# check r7

	cmpd    r9,r7

	bne     1f

	addi    r9,r15,8	# check r8

	cmpd    r9,r8

	bne     1f

	addi    r9,r15,13	# check r13

	cmpd    r9,r13

	bne     1f

	addi    r9,r15,14	# check r14

	cmpd    r9,r14

	bne     1f

	addi    r9,r15,16	# check r16

	cmpd    r9,r16

	bne     1f

	addi    r9,r15,17	# check r17

	cmpd    r9,r17

	bne     1f

	addi    r9,r15,18	# check r18

	cmpd    r9,r18

	bne     1f

	addi    r9,r15,19	# check r19

	cmpd    r9,r19

	bne     1f

	addi    r9,r15,20	# check r20

	cmpd    r9,r20

	bne     1f

	addi    r9,r15,21	# check r21

	cmpd    r9,r21

	bne     1f

	addi    r9,r15,22	# check r22

	cmpd    r9,r22

	bne     1f

	addi    r9,r15,23	# check r23

	cmpd    r9,r23

	bne     1f

	addi    r9,r15,24	# check r24

	cmpd    r9,r24

	bne     1f

	addi    r9,r15,25	# check r25

	cmpd    r9,r25

	bne     1f

	addi    r9,r15,26	# check r26

	cmpd    r9,r26

	bne     1f

	addi    r9,r15,27	# check r27

	cmpd    r9,r27

	bne     1f

	addi    r9,r15,28	# check r28

	cmpd    r9,r28

	bne     1f

	addi    r9,r15,29	# check r29

	cmpd    r9,r29

	bne     1f

	addi    r9,r15,30	# check r30

	cmpd    r9,r30

	bne     1f

	addi    r9,r15,31	# check r31

	cmpd    r9,r31

	bne     1f

	b	2f

1:	mr	r3, r9

	li	r0, __NR_exit

	sc

2:	li	r0, __NR_switch_endian

	nop

tools/testing/selftests/powerpc/switch_endian/common.h

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#include <ppc-asm.h>

#include <asm/unistd.h>



#ifndef __NR_switch_endian

#define __NR_switch_endian 363

#endif