tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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: Michael Ellerman <mpe@ellerman.id.au>
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-1
tools/testing/selftests/powerpc/Makefile
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-1
tools/testing/selftests/powerpc/Makefile
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tools/testing/selftests/powerpc/switch_endian/.gitignore
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tools/testing/selftests/powerpc/switch_endian/.gitignore
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tools/testing/selftests/powerpc/switch_endian/Makefile
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tools/testing/selftests/powerpc/switch_endian/Makefile
···
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CC := $(CROSS_COMPILE)gcc
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PROGS := switch_endian_test
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ASFLAGS += -O2 -Wall -g -nostdlib -m64
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all: $(PROGS)
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switch_endian_test: check-reversed.S
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check-reversed.o: check.o
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$(CROSS_COMPILE)objcopy -j .text --reverse-bytes=4 -O binary $< $@
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check-reversed.S: check-reversed.o
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hexdump -v -e '/1 ".byte 0x%02X\n"' $< > $@
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run_tests: all
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@-for PROG in $(PROGS); do \
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./$$PROG; \
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done;
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clean:
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rm -f $(PROGS) *.o check-reversed.S
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.PHONY: all run_tests clean
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tools/testing/selftests/powerpc/switch_endian/check.S
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tools/testing/selftests/powerpc/switch_endian/check.S
···
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#include "common.h"
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/*
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* Checks that registers contain what we expect, ie. they were not clobbered by
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* the syscall.
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*
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* r15: pattern to check registers against.
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*
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* At the end r3 == 0 if everything's OK.
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*/
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nop # guaranteed to be illegal in reverse-endian
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mr r9,r15
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cmpd r9,r3 # check r3
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bne 1f
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addi r9,r15,4 # check r4
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cmpd r9,r4
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bne 1f
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lis r9,0x00FF # check CR
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ori r9,r9,0xF000
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mfcr r10
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and r10,r10,r9
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cmpw r9,r10
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addi r9,r15,34
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bne 1f
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addi r9,r15,32 # check LR
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mflr r10
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cmpd r9,r10
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bne 1f
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addi r9,r15,5 # check r5
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cmpd r9,r5
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bne 1f
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addi r9,r15,6 # check r6
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cmpd r9,r6
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bne 1f
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addi r9,r15,7 # check r7
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cmpd r9,r7
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bne 1f
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addi r9,r15,8 # check r8
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cmpd r9,r8
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bne 1f
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addi r9,r15,13 # check r13
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cmpd r9,r13
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bne 1f
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addi r9,r15,14 # check r14
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cmpd r9,r14
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bne 1f
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addi r9,r15,16 # check r16
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cmpd r9,r16
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bne 1f
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addi r9,r15,17 # check r17
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cmpd r9,r17
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bne 1f
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addi r9,r15,18 # check r18
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cmpd r9,r18
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bne 1f
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addi r9,r15,19 # check r19
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cmpd r9,r19
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bne 1f
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addi r9,r15,20 # check r20
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cmpd r9,r20
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bne 1f
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addi r9,r15,21 # check r21
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cmpd r9,r21
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bne 1f
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addi r9,r15,22 # check r22
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cmpd r9,r22
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bne 1f
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addi r9,r15,23 # check r23
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cmpd r9,r23
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bne 1f
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addi r9,r15,24 # check r24
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cmpd r9,r24
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bne 1f
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addi r9,r15,25 # check r25
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cmpd r9,r25
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bne 1f
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addi r9,r15,26 # check r26
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cmpd r9,r26
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bne 1f
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addi r9,r15,27 # check r27
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cmpd r9,r27
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bne 1f
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addi r9,r15,28 # check r28
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cmpd r9,r28
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bne 1f
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addi r9,r15,29 # check r29
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cmpd r9,r29
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bne 1f
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addi r9,r15,30 # check r30
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cmpd r9,r30
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bne 1f
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addi r9,r15,31 # check r31
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cmpd r9,r31
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bne 1f
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b 2f
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1: mr r3, r9
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li r0, __NR_exit
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sc
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2: li r0, __NR_switch_endian
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nop
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tools/testing/selftests/powerpc/switch_endian/common.h
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tools/testing/selftests/powerpc/switch_endian/common.h
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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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#include "common.h"
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.data
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.balign 8
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message:
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.ascii "success: switch_endian_test\n\0"
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.section ".toc"
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.balign 8
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pattern:
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.llong 0x5555AAAA5555AAAA
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.text
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FUNC_START(_start)
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/* Load the pattern */
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ld r15, pattern@TOC(%r2)
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/* Setup CR, only CR2-CR4 are maintained */
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lis r3, 0x00FF
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ori r3, r3, 0xF000
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mtcr r3
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/* Load the pattern slightly modified into the registers */
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mr r3, r15
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addi r4, r15, 4
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addi r5, r15, 32
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mtlr r5
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addi r5, r15, 5
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addi r6, r15, 6
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addi r7, r15, 7
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addi r8, r15, 8
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/* r9 - r12 are clobbered */
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addi r13, r15, 13
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addi r14, r15, 14
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/* Skip r15 we're using it */
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addi r16, r15, 16
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addi r17, r15, 17
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addi r18, r15, 18
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addi r19, r15, 19
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addi r20, r15, 20
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addi r21, r15, 21
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addi r22, r15, 22
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addi r23, r15, 23
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addi r24, r15, 24
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addi r25, r15, 25
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addi r26, r15, 26
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addi r27, r15, 27
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addi r28, r15, 28
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addi r29, r15, 29
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addi r30, r15, 30
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addi r31, r15, 31
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/*
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* Call the syscall to switch endian.
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* It clobbers r9-r12, XER, CTR and CR0-1,5-7.
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*/
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li r0, __NR_switch_endian
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sc
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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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.long 0x02000044 /* sc */
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#include "check.S"
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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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sc
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b .