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vdso_test_correctness test fails on powerpc: ~ # ./vdso_test_correctness ... [RUN] Testing clock_gettime for clock CLOCK_REALTIME_ALARM (8)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 [RUN] Testing clock_gettime for clock CLOCK_BOOTTIME_ALARM (9)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 [RUN] Testing clock_gettime for clock CLOCK_SGI_CYCLE (10)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 ... [RUN] Testing clock_gettime for clock invalid (-1)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 [RUN] Testing clock_gettime for clock invalid (-2147483648)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 [RUN] Testing clock_gettime for clock invalid (2147483647)... [FAIL] No such clock, but __vdso_clock_gettime returned 22 On powerpc, a call to a VDSO function is not an ordinary C function call. Unlike several architectures which returns a negative error code in case of an error, powerpc sets CR[SO] and returns the error code as a positive value. Define and use a macro called VDSO_CALL() which takes a pointer to the function to call, the number of arguments and the arguments. Also update ABI vdso documentation to reflect this subtlety. Provide a specific version of VDSO_CALL() for powerpc that negates the error code on return when CR[SO] is set. Fixes:c7e5789b24("kselftest: Move test_vdso to the vDSO test suite") Fixes:2e9a972566("selftests: vdso: Add a selftest for vDSO getcpu()") Fixes:693f5ca08c("kselftest: Extend vDSO selftest") Fixes:b2f1c3db28("kselftest: Extend vdso correctness test to clock_gettime64") Fixes:4920a2590e("selftests/vDSO: add tests for vgetrandom") Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Acked-by: Shuah Khan <skhan@linuxfoundation.org> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Macro to call vDSO functions
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*
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* Copyright (C) 2024 Christophe Leroy <christophe.leroy@csgroup.eu>, CS GROUP France
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*/
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#ifndef __VDSO_CALL_H__
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#define __VDSO_CALL_H__
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#ifdef __powerpc__
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#define LOADARGS_1(fn, __arg1) do { \
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_r0 = fn; \
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_r3 = (long)__arg1; \
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} while (0)
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#define LOADARGS_2(fn, __arg1, __arg2) do { \
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_r0 = fn; \
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_r3 = (long)__arg1; \
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_r4 = (long)__arg2; \
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} while (0)
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#define LOADARGS_3(fn, __arg1, __arg2, __arg3) do { \
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_r0 = fn; \
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_r3 = (long)__arg1; \
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_r4 = (long)__arg2; \
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_r5 = (long)__arg3; \
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} while (0)
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#define LOADARGS_5(fn, __arg1, __arg2, __arg3, __arg4, __arg5) do { \
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_r0 = fn; \
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_r3 = (long)__arg1; \
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_r4 = (long)__arg2; \
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_r5 = (long)__arg3; \
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_r6 = (long)__arg4; \
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_r7 = (long)__arg5; \
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} while (0)
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#define VDSO_CALL(fn, nr, args...) ({ \
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register void *_r0 asm ("r0"); \
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register long _r3 asm ("r3"); \
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register long _r4 asm ("r4"); \
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register long _r5 asm ("r5"); \
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register long _r6 asm ("r6"); \
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register long _r7 asm ("r7"); \
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register long _r8 asm ("r8"); \
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register long _rval asm ("r3"); \
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\
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LOADARGS_##nr(fn, args); \
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\
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asm volatile( \
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" mtctr %0\n" \
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" bctrl\n" \
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" bns+ 1f\n" \
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" neg 3, 3\n" \
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"1:" \
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: "+r" (_r0), "=r" (_r3), "+r" (_r4), "+r" (_r5), \
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"+r" (_r6), "+r" (_r7), "+r" (_r8) \
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: "r" (_rval) \
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: "r9", "r10", "r11", "r12", "cr0", "cr1", "cr5", \
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"cr6", "cr7", "xer", "lr", "ctr", "memory" \
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); \
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_rval; \
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})
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#else
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#define VDSO_CALL(fn, nr, args...) fn(args)
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#endif
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#endif
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