98 lines
1.7 KiB
ArmAsm
98 lines
1.7 KiB
ArmAsm
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/* SPDX-License-Identifier: GPL-2.0 */
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#include "common.h"
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.data
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.balign 8
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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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pattern:
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.8byte 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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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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.long 0x02000044 /* sc */
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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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sc
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li r0, __NR_exit
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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
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