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commit 82b1acd9de9796298a230d7484f26fe9a7756d18
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Author: Paul A. Clarke <pc@us.ibm.com>
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Date: Sat Sep 25 09:57:15 2021 -0500
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powerpc: Fix unrecognized instruction errors with recent binutils
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Recent versions of binutils (with commit
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b25f942e18d6ecd7ec3e2d2e9930eb4f996c258a) stopped preserving "sticky"
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options across a base `.machine` directive, nullifying the use of
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passing "-many" through GCC to the assembler. As a result, some
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instructions which were recognized even under older, more stringent
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`.machine` directives become unrecognized instructions in that
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context.
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In `sysdeps/powerpc/tst-set_ppr.c`, the use of the `mfppr32` extended
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mnemonic became unrecognized, as the default compilation with GCC for
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32bit powerpc adds a `.machine ppc` in the resulting assembly, so the
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command line option `-Wa,-many` is essentially ignored, and the ISA 2.06
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instructions and mnemonics, like `mfppr32`, are unrecognized.
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The compilation of `sysdeps/powerpc/tst-set_ppr.c` fails with:
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Error: unrecognized opcode: `mfppr32'
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Add appropriate `.machine` directives in the assembly to bracket the
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`mfppr32` instruction.
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Part of a 2019 fix (commit 9250e6610fdb0f3a6f238d2813e319a41fb7a810) to
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the above test's Makefile to add `-many` to the compilation when GCC
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itself stopped passing `-many` to the assember no longer has any effect,
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so remove that.
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Reported-by: Joseph Myers <joseph@codesourcery.com>
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(cherry picked from commit ee874f44fd55988808a4a162ef21bfa2cc8dc6f7)
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diff --git a/sysdeps/powerpc/Makefile b/sysdeps/powerpc/Makefile
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index 09860ffc0155d765..5e6cb07ce66decfa 100644
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--- a/sysdeps/powerpc/Makefile
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+++ b/sysdeps/powerpc/Makefile
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@@ -61,11 +61,6 @@ ifeq ($(subdir),misc)
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sysdep_headers += sys/platform/ppc.h
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tests += test-gettimebase
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tests += tst-set_ppr
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-
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-# This test is expected to run and exit with EXIT_UNSUPPORTED on
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-# processors that do not implement the Power ISA 2.06 or greater.
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-# But the test makes use of instructions from Power ISA 2.06 and 2.07.
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-CFLAGS-tst-set_ppr.c += -Wa,-many
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endif
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ifeq ($(subdir),wcsmbs)
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diff --git a/sysdeps/powerpc/tst-set_ppr.c b/sysdeps/powerpc/tst-set_ppr.c
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index 7684f5d6ea905c60..e80da15320635585 100644
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--- a/sysdeps/powerpc/tst-set_ppr.c
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+++ b/sysdeps/powerpc/tst-set_ppr.c
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@@ -44,7 +44,8 @@ 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 (MFPPR" %0" : "=r"(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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