tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
selftests/powerpc: Move core_busy_loop() into asm
There is at least one bug in core_busy_loop(), we use r0, but it's
not in the clobber list. We were getting away with this it seems but
that was luck.
It's also fishy to be touching the stack, even if we do it below the
stack pointer. It seems we get away with it, but looking at the
generated code that may just be luck.
So move it into assembler, do all the stack handling by hand. We create
a stack frame to save the non-volatiles in, so we can muck around with
them.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
authored by
Michael Ellerman
and committed by
Benjamin Herrenschmidt
6873def9
6861b44a
+272
-253
+1
-1
tools/testing/selftests/powerpc/pmu/ebb/Makefile
+1
-1
tools/testing/selftests/powerpc/pmu/ebb/Makefile
+271
tools/testing/selftests/powerpc/pmu/ebb/busy_loop.S
+271
tools/testing/selftests/powerpc/pmu/ebb/busy_loop.S
···
1
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/*
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* Copyright 2014, Michael Ellerman, IBM Corp.
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* Licensed under GPLv2.
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*/
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#include <ppc-asm.h>
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8
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.text
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10
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FUNC_START(core_busy_loop)
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stdu %r1, -168(%r1)
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std r14, 160(%r1)
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std r15, 152(%r1)
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std r16, 144(%r1)
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std r17, 136(%r1)
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std r18, 128(%r1)
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std r19, 120(%r1)
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std r20, 112(%r1)
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std r21, 104(%r1)
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std r22, 96(%r1)
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std r23, 88(%r1)
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std r24, 80(%r1)
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std r25, 72(%r1)
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std r26, 64(%r1)
25
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std r27, 56(%r1)
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std r28, 48(%r1)
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std r29, 40(%r1)
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std r30, 32(%r1)
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std r31, 24(%r1)
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31
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li r3, 0x3030
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std r3, -96(%r1)
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li r4, 0x4040
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std r4, -104(%r1)
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li r5, 0x5050
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std r5, -112(%r1)
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li r6, 0x6060
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std r6, -120(%r1)
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li r7, 0x7070
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std r7, -128(%r1)
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li r8, 0x0808
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std r8, -136(%r1)
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li r9, 0x0909
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std r9, -144(%r1)
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li r10, 0x1010
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std r10, -152(%r1)
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li r11, 0x1111
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std r11, -160(%r1)
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li r14, 0x1414
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std r14, -168(%r1)
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li r15, 0x1515
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std r15, -176(%r1)
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li r16, 0x1616
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std r16, -184(%r1)
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li r17, 0x1717
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std r17, -192(%r1)
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li r18, 0x1818
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std r18, -200(%r1)
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li r19, 0x1919
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std r19, -208(%r1)
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li r20, 0x2020
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std r20, -216(%r1)
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li r21, 0x2121
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std r21, -224(%r1)
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li r22, 0x2222
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std r22, -232(%r1)
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li r23, 0x2323
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std r23, -240(%r1)
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li r24, 0x2424
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std r24, -248(%r1)
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li r25, 0x2525
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std r25, -256(%r1)
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li r26, 0x2626
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std r26, -264(%r1)
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li r27, 0x2727
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std r27, -272(%r1)
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li r28, 0x2828
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std r28, -280(%r1)
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li r29, 0x2929
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std r29, -288(%r1)
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li r30, 0x3030
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li r31, 0x3131
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li r3, 0
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0: addi r3, r3, 1
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cmpwi r3, 100
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blt 0b
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/* Return 1 (fail) unless we get through all the checks */
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li r3, 1
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/* Check none of our registers have been corrupted */
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cmpwi r4, 0x4040
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bne 1f
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cmpwi r5, 0x5050
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bne 1f
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cmpwi r6, 0x6060
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bne 1f
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cmpwi r7, 0x7070
100
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bne 1f
101
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cmpwi r8, 0x0808
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bne 1f
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cmpwi r9, 0x0909
104
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bne 1f
105
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cmpwi r10, 0x1010
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bne 1f
107
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cmpwi r11, 0x1111
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bne 1f
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cmpwi r14, 0x1414
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bne 1f
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cmpwi r15, 0x1515
112
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bne 1f
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cmpwi r16, 0x1616
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bne 1f
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cmpwi r17, 0x1717
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bne 1f
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cmpwi r18, 0x1818
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bne 1f
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cmpwi r19, 0x1919
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bne 1f
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cmpwi r20, 0x2020
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bne 1f
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cmpwi r21, 0x2121
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bne 1f
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cmpwi r22, 0x2222
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bne 1f
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cmpwi r23, 0x2323
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bne 1f
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cmpwi r24, 0x2424
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bne 1f
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cmpwi r25, 0x2525
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bne 1f
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cmpwi r26, 0x2626
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bne 1f
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cmpwi r27, 0x2727
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bne 1f
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cmpwi r28, 0x2828
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bne 1f
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cmpwi r29, 0x2929
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bne 1f
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cmpwi r30, 0x3030
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bne 1f
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cmpwi r31, 0x3131
144
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bne 1f
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/* Load junk into all our registers before we reload them from the stack. */
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li r3, 0xde
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li r4, 0xad
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li r5, 0xbe
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li r6, 0xef
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li r7, 0xde
152
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li r8, 0xad
153
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li r9, 0xbe
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li r10, 0xef
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li r11, 0xde
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li r14, 0xad
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li r15, 0xbe
158
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li r16, 0xef
159
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li r17, 0xde
160
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li r18, 0xad
161
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li r19, 0xbe
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li r20, 0xef
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li r21, 0xde
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li r22, 0xad
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li r23, 0xbe
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li r24, 0xef
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li r25, 0xde
168
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li r26, 0xad
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li r27, 0xbe
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li r28, 0xef
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li r29, 0xdd
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ld r3, -96(%r1)
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cmpwi r3, 0x3030
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bne 1f
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ld r4, -104(%r1)
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cmpwi r4, 0x4040
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bne 1f
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ld r5, -112(%r1)
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cmpwi r5, 0x5050
181
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bne 1f
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ld r6, -120(%r1)
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cmpwi r6, 0x6060
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bne 1f
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ld r7, -128(%r1)
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cmpwi r7, 0x7070
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bne 1f
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ld r8, -136(%r1)
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cmpwi r8, 0x0808
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bne 1f
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ld r9, -144(%r1)
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cmpwi r9, 0x0909
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bne 1f
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ld r10, -152(%r1)
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cmpwi r10, 0x1010
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bne 1f
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ld r11, -160(%r1)
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cmpwi r11, 0x1111
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bne 1f
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ld r14, -168(%r1)
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cmpwi r14, 0x1414
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bne 1f
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ld r15, -176(%r1)
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cmpwi r15, 0x1515
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bne 1f
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ld r16, -184(%r1)
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cmpwi r16, 0x1616
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bne 1f
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ld r17, -192(%r1)
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cmpwi r17, 0x1717
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bne 1f
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ld r18, -200(%r1)
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cmpwi r18, 0x1818
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bne 1f
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ld r19, -208(%r1)
216
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cmpwi r19, 0x1919
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bne 1f
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ld r20, -216(%r1)
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cmpwi r20, 0x2020
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bne 1f
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ld r21, -224(%r1)
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cmpwi r21, 0x2121
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bne 1f
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ld r22, -232(%r1)
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cmpwi r22, 0x2222
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bne 1f
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ld r23, -240(%r1)
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cmpwi r23, 0x2323
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bne 1f
230
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ld r24, -248(%r1)
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cmpwi r24, 0x2424
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bne 1f
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ld r25, -256(%r1)
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cmpwi r25, 0x2525
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bne 1f
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ld r26, -264(%r1)
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cmpwi r26, 0x2626
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bne 1f
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ld r27, -272(%r1)
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cmpwi r27, 0x2727
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bne 1f
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ld r28, -280(%r1)
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cmpwi r28, 0x2828
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bne 1f
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ld r29, -288(%r1)
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cmpwi r29, 0x2929
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bne 1f
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/* Load 0 (success) to return */
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li r3, 0
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1: ld r14, 160(%r1)
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ld r15, 152(%r1)
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ld r16, 144(%r1)
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ld r17, 136(%r1)
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ld r18, 128(%r1)
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ld r19, 120(%r1)
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ld r20, 112(%r1)
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ld r21, 104(%r1)
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ld r22, 96(%r1)
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ld r23, 88(%r1)
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ld r24, 80(%r1)
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ld r25, 72(%r1)
264
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ld r26, 64(%r1)
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ld r27, 56(%r1)
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ld r28, 48(%r1)
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ld r29, 40(%r1)
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ld r30, 32(%r1)
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ld r31, 24(%r1)
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addi %r1, %r1, 168
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blr
-251
tools/testing/selftests/powerpc/pmu/ebb/ebb.c
-251
tools/testing/selftests/powerpc/pmu/ebb/ebb.c
···
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e->attr.pinned = 1;
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}
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int core_busy_loop(void)
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{
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int rc;
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asm volatile (
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"li 3, 0x3030\n"
344
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"std 3, -96(1)\n"
345
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"li 4, 0x4040\n"
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"std 4, -104(1)\n"
347
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"li 5, 0x5050\n"
348
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"std 5, -112(1)\n"
349
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"li 6, 0x6060\n"
350
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"std 6, -120(1)\n"
351
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"li 7, 0x7070\n"
352
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"std 7, -128(1)\n"
353
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"li 8, 0x0808\n"
354
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"std 8, -136(1)\n"
355
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"li 9, 0x0909\n"
356
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"std 9, -144(1)\n"
357
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"li 10, 0x1010\n"
358
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"std 10, -152(1)\n"
359
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"li 11, 0x1111\n"
360
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"std 11, -160(1)\n"
361
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"li 14, 0x1414\n"
362
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"std 14, -168(1)\n"
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"li 15, 0x1515\n"
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"std 15, -176(1)\n"
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"li 16, 0x1616\n"
366
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"std 16, -184(1)\n"
367
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"li 17, 0x1717\n"
368
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"std 17, -192(1)\n"
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"li 18, 0x1818\n"
370
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"std 18, -200(1)\n"
371
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"li 19, 0x1919\n"
372
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"std 19, -208(1)\n"
373
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"li 20, 0x2020\n"
374
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"std 20, -216(1)\n"
375
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"li 21, 0x2121\n"
376
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"std 21, -224(1)\n"
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"li 22, 0x2222\n"
378
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"std 22, -232(1)\n"
379
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"li 23, 0x2323\n"
380
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"std 23, -240(1)\n"
381
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"li 24, 0x2424\n"
382
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"std 24, -248(1)\n"
383
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"li 25, 0x2525\n"
384
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"std 25, -256(1)\n"
385
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"li 26, 0x2626\n"
386
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"std 26, -264(1)\n"
387
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"li 27, 0x2727\n"
388
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"std 27, -272(1)\n"
389
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"li 28, 0x2828\n"
390
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"std 28, -280(1)\n"
391
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"li 29, 0x2929\n"
392
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"std 29, -288(1)\n"
393
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"li 30, 0x3030\n"
394
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"li 31, 0x3131\n"
395
-
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"li 3, 0\n"
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"0: "
398
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"addi 3, 3, 1\n"
399
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"cmpwi 3, 100\n"
400
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"blt 0b\n"
401
-
402
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/* Return 1 (fail) unless we get through all the checks */
403
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"li 0, 1\n"
404
-
405
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/* Check none of our registers have been corrupted */
406
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"cmpwi 4, 0x4040\n"
407
-
"bne 1f\n"
408
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"cmpwi 5, 0x5050\n"
409
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"bne 1f\n"
410
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"cmpwi 6, 0x6060\n"
411
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"bne 1f\n"
412
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"cmpwi 7, 0x7070\n"
413
-
"bne 1f\n"
414
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"cmpwi 8, 0x0808\n"
415
-
"bne 1f\n"
416
-
"cmpwi 9, 0x0909\n"
417
-
"bne 1f\n"
418
-
"cmpwi 10, 0x1010\n"
419
-
"bne 1f\n"
420
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"cmpwi 11, 0x1111\n"
421
-
"bne 1f\n"
422
-
"cmpwi 14, 0x1414\n"
423
-
"bne 1f\n"
424
-
"cmpwi 15, 0x1515\n"
425
-
"bne 1f\n"
426
-
"cmpwi 16, 0x1616\n"
427
-
"bne 1f\n"
428
-
"cmpwi 17, 0x1717\n"
429
-
"bne 1f\n"
430
-
"cmpwi 18, 0x1818\n"
431
-
"bne 1f\n"
432
-
"cmpwi 19, 0x1919\n"
433
-
"bne 1f\n"
434
-
"cmpwi 20, 0x2020\n"
435
-
"bne 1f\n"
436
-
"cmpwi 21, 0x2121\n"
437
-
"bne 1f\n"
438
-
"cmpwi 22, 0x2222\n"
439
-
"bne 1f\n"
440
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"cmpwi 23, 0x2323\n"
441
-
"bne 1f\n"
442
-
"cmpwi 24, 0x2424\n"
443
-
"bne 1f\n"
444
-
"cmpwi 25, 0x2525\n"
445
-
"bne 1f\n"
446
-
"cmpwi 26, 0x2626\n"
447
-
"bne 1f\n"
448
-
"cmpwi 27, 0x2727\n"
449
-
"bne 1f\n"
450
-
"cmpwi 28, 0x2828\n"
451
-
"bne 1f\n"
452
-
"cmpwi 29, 0x2929\n"
453
-
"bne 1f\n"
454
-
"cmpwi 30, 0x3030\n"
455
-
"bne 1f\n"
456
-
"cmpwi 31, 0x3131\n"
457
-
"bne 1f\n"
458
-
459
-
/* Load junk into all our registers before we reload them from the stack. */
460
-
"li 3, 0xde\n"
461
-
"li 4, 0xad\n"
462
-
"li 5, 0xbe\n"
463
-
"li 6, 0xef\n"
464
-
"li 7, 0xde\n"
465
-
"li 8, 0xad\n"
466
-
"li 9, 0xbe\n"
467
-
"li 10, 0xef\n"
468
-
"li 11, 0xde\n"
469
-
"li 14, 0xad\n"
470
-
"li 15, 0xbe\n"
471
-
"li 16, 0xef\n"
472
-
"li 17, 0xde\n"
473
-
"li 18, 0xad\n"
474
-
"li 19, 0xbe\n"
475
-
"li 20, 0xef\n"
476
-
"li 21, 0xde\n"
477
-
"li 22, 0xad\n"
478
-
"li 23, 0xbe\n"
479
-
"li 24, 0xef\n"
480
-
"li 25, 0xde\n"
481
-
"li 26, 0xad\n"
482
-
"li 27, 0xbe\n"
483
-
"li 28, 0xef\n"
484
-
"li 29, 0xdd\n"
485
-
486
-
"ld 3, -96(1)\n"
487
-
"cmpwi 3, 0x3030\n"
488
-
"bne 1f\n"
489
-
"ld 4, -104(1)\n"
490
-
"cmpwi 4, 0x4040\n"
491
-
"bne 1f\n"
492
-
"ld 5, -112(1)\n"
493
-
"cmpwi 5, 0x5050\n"
494
-
"bne 1f\n"
495
-
"ld 6, -120(1)\n"
496
-
"cmpwi 6, 0x6060\n"
497
-
"bne 1f\n"
498
-
"ld 7, -128(1)\n"
499
-
"cmpwi 7, 0x7070\n"
500
-
"bne 1f\n"
501
-
"ld 8, -136(1)\n"
502
-
"cmpwi 8, 0x0808\n"
503
-
"bne 1f\n"
504
-
"ld 9, -144(1)\n"
505
-
"cmpwi 9, 0x0909\n"
506
-
"bne 1f\n"
507
-
"ld 10, -152(1)\n"
508
-
"cmpwi 10, 0x1010\n"
509
-
"bne 1f\n"
510
-
"ld 11, -160(1)\n"
511
-
"cmpwi 11, 0x1111\n"
512
-
"bne 1f\n"
513
-
"ld 14, -168(1)\n"
514
-
"cmpwi 14, 0x1414\n"
515
-
"bne 1f\n"
516
-
"ld 15, -176(1)\n"
517
-
"cmpwi 15, 0x1515\n"
518
-
"bne 1f\n"
519
-
"ld 16, -184(1)\n"
520
-
"cmpwi 16, 0x1616\n"
521
-
"bne 1f\n"
522
-
"ld 17, -192(1)\n"
523
-
"cmpwi 17, 0x1717\n"
524
-
"bne 1f\n"
525
-
"ld 18, -200(1)\n"
526
-
"cmpwi 18, 0x1818\n"
527
-
"bne 1f\n"
528
-
"ld 19, -208(1)\n"
529
-
"cmpwi 19, 0x1919\n"
530
-
"bne 1f\n"
531
-
"ld 20, -216(1)\n"
532
-
"cmpwi 20, 0x2020\n"
533
-
"bne 1f\n"
534
-
"ld 21, -224(1)\n"
535
-
"cmpwi 21, 0x2121\n"
536
-
"bne 1f\n"
537
-
"ld 22, -232(1)\n"
538
-
"cmpwi 22, 0x2222\n"
539
-
"bne 1f\n"
540
-
"ld 23, -240(1)\n"
541
-
"cmpwi 23, 0x2323\n"
542
-
"bne 1f\n"
543
-
"ld 24, -248(1)\n"
544
-
"cmpwi 24, 0x2424\n"
545
-
"bne 1f\n"
546
-
"ld 25, -256(1)\n"
547
-
"cmpwi 25, 0x2525\n"
548
-
"bne 1f\n"
549
-
"ld 26, -264(1)\n"
550
-
"cmpwi 26, 0x2626\n"
551
-
"bne 1f\n"
552
-
"ld 27, -272(1)\n"
553
-
"cmpwi 27, 0x2727\n"
554
-
"bne 1f\n"
555
-
"ld 28, -280(1)\n"
556
-
"cmpwi 28, 0x2828\n"
557
-
"bne 1f\n"
558
-
"ld 29, -288(1)\n"
559
-
"cmpwi 29, 0x2929\n"
560
-
"bne 1f\n"
561
-
562
-
/* Load 0 (success) to return */
563
-
"li 0, 0\n"
564
-
565
-
"1: mr %0, 0\n"
566
-
567
-
: "=r" (rc)
568
-
: /* no inputs */
569
-
: "3", "4", "5", "6", "7", "8", "9", "10", "11", "14",
570
-
"15", "16", "17", "18", "19", "20", "21", "22", "23",
571
-
"24", "25", "26", "27", "28", "29", "30", "31",
572
-
"memory"
573
-
);
574
-
575
-
return rc;
576
-
}
577
-
578
-
int core_busy_loop_with_freeze(void)
579
-
{
580
-
int rc;
581
-
582
-
mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) & ~MMCR0_FC);
583
-
rc = core_busy_loop();
584
-
mtspr(SPRN_MMCR0, mfspr(SPRN_MMCR0) | MMCR0_FC);
585
-
586
-
return rc;
587
-
}
588
-
589
338
int ebb_child(union pipe read_pipe, union pipe write_pipe)
590
339
{
591
340
struct event event;
-1
tools/testing/selftests/powerpc/pmu/ebb/ebb.h
-1
tools/testing/selftests/powerpc/pmu/ebb/ebb.h