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ee874f44fd
Recent versions of binutils (with commit
b25f942e18d6ecd7ec3e2d2e9930eb4f996c258a) stopped preserving "sticky"
options across a base `.machine` directive, nullifying the use of
passing "-many" through GCC to the assembler. As a result, some
instructions which were recognized even under older, more stringent
`.machine` directives become unrecognized instructions in that
context.
In `sysdeps/powerpc/tst-set_ppr.c`, the use of the `mfppr32` extended
mnemonic became unrecognized, as the default compilation with GCC for
32bit powerpc adds a `.machine ppc` in the resulting assembly, so the
command line option `-Wa,-many` is essentially ignored, and the ISA 2.06
instructions and mnemonics, like `mfppr32`, are unrecognized.
The compilation of `sysdeps/powerpc/tst-set_ppr.c` fails with:
Error: unrecognized opcode: `mfppr32'
Add appropriate `.machine` directives in the assembly to bracket the
`mfppr32` instruction.
Part of a 2019 fix (commit 9250e6610f) to
the above test's Makefile to add `-many` to the compilation when GCC
itself stopped passing `-many` to the assember no longer has any effect,
so remove that.
Reported-by: Joseph Myers <joseph@codesourcery.com>
104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/* Test the implementation of __ppc_set_ppr_* functions.
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Copyright (C) 2017-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <sys/auxv.h>
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#include <sys/platform/ppc.h>
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#include <support/test-driver.h>
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#ifdef __powerpc64__
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typedef uint64_t ppr_t;
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# define MFPPR "mfppr"
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/* The thread priority value is obtained from bits 11:13. */
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# define EXTRACT_THREAD_PRIORITY(x) ((x >> 50) & 7)
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#else
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typedef uint32_t ppr_t;
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# define MFPPR "mfppr32"
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/* For 32-bit, the upper 32 bits of the Program Priority Register (PPR)
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are used, so the thread priority value is obtained from bits 43:46. */
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# define EXTRACT_THREAD_PRIORITY(x) ((x >> 18) & 7)
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#endif /* !__powerpc64__ */
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/* Read the thread priority value set in the PPR. */
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static __inline__ ppr_t
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get_thread_priority (void)
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{
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/* Read the PPR. */
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ppr_t ppr;
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asm volatile (".machine push; .machine power7; "MFPPR" %0; .machine pop"
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: "=r"(ppr));
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/* Return the thread priority value. */
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return EXTRACT_THREAD_PRIORITY (ppr);
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}
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/* Check the thread priority bits of PPR are set as expected. */
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uint8_t
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check_thread_priority (uint8_t expected)
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{
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ppr_t actual = get_thread_priority ();
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if (actual != expected)
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{
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printf ("FAIL: Expected %"PRIu8" got %"PRIuMAX".\n", expected,
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(uintmax_t) actual);
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return 1;
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}
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printf ("PASS: Thread priority set to %"PRIu8" correctly.\n", expected);
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return 0;
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}
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/* The Power ISA 2.06 allows the following thread priorities for any
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problem state program: low (2), medium low (3), and medium (4).
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Power ISA 2.07b added very low (1).
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Check whether the values set by __ppc_set_ppr_* are correct. */
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static int
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do_test (void)
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{
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/* Check for the minimum required Power ISA to run these tests. */
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if ((getauxval (AT_HWCAP) & PPC_FEATURE_ARCH_2_06) == 0)
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{
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printf ("Requires an environment that implements the Power ISA version"
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" 2.06 or greater.\n");
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return EXIT_UNSUPPORTED;
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}
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uint8_t rc = 0;
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#ifdef _ARCH_PWR8
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__ppc_set_ppr_very_low ();
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rc |= check_thread_priority (1);
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#endif /* _ARCH_PWR8 */
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__ppc_set_ppr_low ();
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rc |= check_thread_priority (2);
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__ppc_set_ppr_med_low ();
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rc |= check_thread_priority (3);
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__ppc_set_ppr_med ();
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rc |= check_thread_priority (4);
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return rc;
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}
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#include <support/test-driver.c>
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