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e921c89e01
Some SPE opcodes clashes with some recent PowerISA opcodes and until recently gas did not complain about it. However binutils recently changed it and now VLE configured gas does not support to assembler some instruction that might class with VLE (HTM for instance). It also does not help that glibc build hardware lock elision support as default (regardless of assembler support). Although runtime will not actually enables TLE on SPE hardware (since kernel will not advertise it), I see little advantage on adding HTM support on SPE built glibc. SPE uses an incompatible ABI which does not allow share the same build with default powerpc and HTM code slows down SPE without any benefict. This patch fixes it by only building HTM when SPE configuration is not used. Checked with a powerpc-linux-gnuspe build. I also did some sniff tests on a e500 hardware without any issue. [BZ #22926] * sysdeps/powerpc/powerpc32/sysdep.h (ABORT_TRANSACTION_IMPL): Define empty for __SPE__. * sysdeps/powerpc/sysdep.h (ABORT_TRANSACTION): Likewise. * sysdeps/unix/sysv/linux/powerpc/elision-lock.c (__lll_lock_elision): Do not build hardware transactional code for __SPE__. * sysdeps/unix/sysv/linux/powerpc/elision-trylock.c (__lll_trylock_elision): Likewise. * sysdeps/unix/sysv/linux/powerpc/elision-unlock.c (__lll_unlock_elision): Likewise.
188 lines
4.0 KiB
C
188 lines
4.0 KiB
C
/* Copyright (C) 1999-2018 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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<http://www.gnu.org/licenses/>. */
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/*
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* Powerpc Feature masks for the Aux Vector Hardware Capabilities (AT_HWCAP).
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* This entry is copied to _dl_hwcap or rtld_global._dl_hwcap during startup.
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*/
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#define _SYSDEPS_SYSDEP_H 1
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#include <bits/hwcap.h>
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#include <tls.h>
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#include <htm.h>
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#define PPC_FEATURE_970 (PPC_FEATURE_POWER4 + PPC_FEATURE_HAS_ALTIVEC)
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#ifdef __ASSEMBLER__
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/* Symbolic names for the registers. The only portable way to write asm
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code is to use number but this produces really unreadable code.
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Therefore these symbolic names. */
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/* Integer registers. */
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#define r0 0
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#define r1 1
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#define r2 2
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#define r3 3
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#define r4 4
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#define r5 5
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#define r6 6
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#define r7 7
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#define r8 8
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#define r9 9
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#define r10 10
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#define r11 11
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#define r12 12
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#define r13 13
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#define r14 14
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#define r15 15
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#define r16 16
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#define r17 17
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#define r18 18
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#define r19 19
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#define r20 20
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#define r21 21
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#define r22 22
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#define r23 23
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#define r24 24
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#define r25 25
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#define r26 26
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#define r27 27
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#define r28 28
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#define r29 29
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#define r30 30
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#define r31 31
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/* Floating-point registers. */
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#define fp0 0
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#define fp1 1
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#define fp2 2
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#define fp3 3
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#define fp4 4
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#define fp5 5
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#define fp6 6
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#define fp7 7
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#define fp8 8
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#define fp9 9
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#define fp10 10
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#define fp11 11
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#define fp12 12
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#define fp13 13
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#define fp14 14
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#define fp15 15
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#define fp16 16
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#define fp17 17
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#define fp18 18
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#define fp19 19
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#define fp20 20
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#define fp21 21
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#define fp22 22
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#define fp23 23
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#define fp24 24
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#define fp25 25
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#define fp26 26
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#define fp27 27
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#define fp28 28
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#define fp29 29
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#define fp30 30
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#define fp31 31
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/* Condition code registers. */
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#define cr0 0
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#define cr1 1
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#define cr2 2
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#define cr3 3
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#define cr4 4
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#define cr5 5
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#define cr6 6
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#define cr7 7
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/* Vector registers. */
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#define v0 0
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#define v1 1
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#define v2 2
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#define v3 3
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#define v4 4
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#define v5 5
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#define v6 6
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#define v7 7
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#define v8 8
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#define v9 9
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#define v10 10
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#define v11 11
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#define v12 12
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#define v13 13
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#define v14 14
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#define v15 15
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#define v16 16
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#define v17 17
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#define v18 18
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#define v19 19
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#define v20 20
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#define v21 21
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#define v22 22
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#define v23 23
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#define v24 24
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#define v25 25
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#define v26 26
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#define v27 27
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#define v28 28
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#define v29 29
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#define v30 30
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#define v31 31
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#define VRSAVE 256
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/* The 32-bit words of a 64-bit dword are at these offsets in memory. */
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#if defined __LITTLE_ENDIAN__ || defined _LITTLE_ENDIAN
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# define LOWORD 0
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# define HIWORD 4
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#else
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# define LOWORD 4
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# define HIWORD 0
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#endif
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/* The high 16-bit word of a 64-bit dword is at this offset in memory. */
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#if defined __LITTLE_ENDIAN__ || defined _LITTLE_ENDIAN
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# define HISHORT 6
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#else
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# define HISHORT 0
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#endif
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/* This seems to always be the case on PPC. */
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#define ALIGNARG(log2) log2
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#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
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#else
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/* Linux kernel powerpc documentation [1] states issuing a syscall inside a
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transaction is not recommended and may lead to undefined behavior. It
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also states syscalls do not abort transactions. To avoid such traps,
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we abort transaction just before syscalls.
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[1] Documentation/powerpc/transactional_memory.txt [Syscalls] */
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#if !IS_IN(rtld) && !defined(__SPE__)
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# define ABORT_TRANSACTION \
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({ \
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if (THREAD_GET_TM_CAPABLE ()) \
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__libc_tabort (_ABORT_SYSCALL); \
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})
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#else
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# define ABORT_TRANSACTION
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#endif
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#endif /* __ASSEMBLER__ */
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