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44a4ef59d5
While the GCC and Clang compilers already define __ASSEMBLER__ automatically when compiling assembly code, __ASSEMBLY__ is a macro that only gets defined by the Makefiles in the kernel. This can be very confusing when switching between userspace and kernelspace coding, or when dealing with uapi headers that rather should use __ASSEMBLER__ instead. So let's standardize on the __ASSEMBLER__ macro that is provided by the compilers now. This is a completely mechanical patch (done with a simple "sed -i" statement). Cc: Chris Zankel <chris@zankel.net> Cc: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Thomas Huth <thuth@redhat.com> Message-Id: <20250314071013.1575167-40-thuth@redhat.com> Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2018 Cadence Design Systems Inc. */
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#ifndef _ASM_XTENSA_JUMP_LABEL_H
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#define _ASM_XTENSA_JUMP_LABEL_H
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#ifndef __ASSEMBLER__
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#include <linux/types.h>
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#define JUMP_LABEL_NOP_SIZE 3
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static __always_inline bool arch_static_branch(struct static_key *key,
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bool branch)
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{
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asm goto("1:\n\t"
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"_nop\n\t"
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".pushsection __jump_table, \"aw\"\n\t"
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".word 1b, %l[l_yes], %c0\n\t"
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".popsection\n\t"
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: : "i" (&((char *)key)[branch]) : : l_yes);
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return false;
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l_yes:
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return true;
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}
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static __always_inline bool arch_static_branch_jump(struct static_key *key,
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bool branch)
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{
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/*
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* Xtensa assembler will mark certain points in the code
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* as unreachable, so that later assembler or linker relaxation
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* passes could use them. A spot right after the J instruction
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* is one such point. Assembler and/or linker may insert padding
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* or literals here, breaking code flow in case the J instruction
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* is later replaced with NOP. Put a label right after the J to
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* make it reachable and wrap both into a no-transform block
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* to avoid any assembler interference with this.
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*/
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asm goto("1:\n\t"
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".begin no-transform\n\t"
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"_j %l[l_yes]\n\t"
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"2:\n\t"
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".end no-transform\n\t"
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".pushsection __jump_table, \"aw\"\n\t"
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".word 1b, %l[l_yes], %c0\n\t"
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".popsection\n\t"
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: : "i" (&((char *)key)[branch]) : : l_yes);
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return false;
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l_yes:
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return true;
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}
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typedef u32 jump_label_t;
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struct jump_entry {
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jump_label_t code;
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jump_label_t target;
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jump_label_t key;
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};
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#endif /* __ASSEMBLER__ */
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#endif
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