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https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-08-29 10:26:00 -04:00
c6c973dbfa
The minimum supported GCC version is 8.1, which supports flag output operands and always defines __GCC_ASM_FLAG_OUTPUTS__ macro. Remove code depending on __GCC_ASM_FLAG_OUTPUTS__ and use the "=@ccCOND" flag output operand directly. Use the equivalent "=@ccz" instead of "=@cce" flag output operand for CMPXCHG8B and CMPXCHG16B instructions. These instructions set a single flag bit - the Zero flag - and "=@ccz" is used to distinguish the CC user from comparison instructions, where set ZERO flag indeed means that the values are equal. Signed-off-by: Uros Bizjak <ubizjak@gmail.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/r/20250905121723.GCaLrU04lP2A50PT-B@fat_crate.local
105 lines
2.3 KiB
C
105 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_SIGNAL_H
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#define _ASM_X86_SIGNAL_H
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#ifndef __ASSEMBLER__
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#include <linux/linkage.h>
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/* Most things should be clean enough to redefine this at will, if care
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is taken to make libc match. */
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#define _NSIG 64
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#ifdef __i386__
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# define _NSIG_BPW 32
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#else
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# define _NSIG_BPW 64
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#endif
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#define _NSIG_WORDS (_NSIG / _NSIG_BPW)
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typedef unsigned long old_sigset_t; /* at least 32 bits */
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typedef struct {
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unsigned long sig[_NSIG_WORDS];
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} sigset_t;
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/* non-uapi in-kernel SA_FLAGS for those indicates ABI for a signal frame */
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#define SA_IA32_ABI 0x02000000u
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#define SA_X32_ABI 0x01000000u
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#endif /* __ASSEMBLER__ */
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#include <uapi/asm/signal.h>
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#ifndef __ASSEMBLER__
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#define __ARCH_HAS_SA_RESTORER
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#include <asm/asm.h>
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#include <uapi/asm/sigcontext.h>
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#ifdef __i386__
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#define __HAVE_ARCH_SIG_BITOPS
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#define sigaddset(set,sig) \
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(__builtin_constant_p(sig) \
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? __const_sigaddset((set), (sig)) \
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: __gen_sigaddset((set), (sig)))
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static inline void __gen_sigaddset(sigset_t *set, int _sig)
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{
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asm("btsl %1,%0" : "+m"(*set) : "Ir"(_sig - 1) : "cc");
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}
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static inline void __const_sigaddset(sigset_t *set, int _sig)
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{
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unsigned long sig = _sig - 1;
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set->sig[sig / _NSIG_BPW] |= 1 << (sig % _NSIG_BPW);
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}
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#define sigdelset(set, sig) \
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(__builtin_constant_p(sig) \
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? __const_sigdelset((set), (sig)) \
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: __gen_sigdelset((set), (sig)))
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static inline void __gen_sigdelset(sigset_t *set, int _sig)
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{
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asm("btrl %1,%0" : "+m"(*set) : "Ir"(_sig - 1) : "cc");
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}
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static inline void __const_sigdelset(sigset_t *set, int _sig)
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{
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unsigned long sig = _sig - 1;
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set->sig[sig / _NSIG_BPW] &= ~(1 << (sig % _NSIG_BPW));
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}
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static inline int __const_sigismember(sigset_t *set, int _sig)
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{
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unsigned long sig = _sig - 1;
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return 1 & (set->sig[sig / _NSIG_BPW] >> (sig % _NSIG_BPW));
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}
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static inline int __gen_sigismember(sigset_t *set, int _sig)
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{
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bool ret;
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asm("btl %2,%1" : "=@ccc"(ret) : "m"(*set), "Ir"(_sig-1));
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return ret;
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}
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#define sigismember(set, sig) \
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(__builtin_constant_p(sig) \
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? __const_sigismember((set), (sig)) \
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: __gen_sigismember((set), (sig)))
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struct pt_regs;
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#else /* __i386__ */
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#undef __HAVE_ARCH_SIG_BITOPS
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#endif /* !__i386__ */
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#endif /* __ASSEMBLER__ */
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#endif /* _ASM_X86_SIGNAL_H */
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