65a792e84f
Add the arch-specific code to support jump label for TILE-Gx. This code shares NOP instruction with ftrace, so we move it to a common header file. Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com> Signed-off-by: Zhigang Lu <zlu@ezchip.com> Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* Copyright 2015 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_JUMP_LABEL_H
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#define _ASM_TILE_JUMP_LABEL_H
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#include <arch/opcode.h>
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#define JUMP_LABEL_NOP_SIZE TILE_BUNDLE_SIZE_IN_BYTES
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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_volatile_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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".quad 1b, %l[l_yes], %0 + %1 \n\t"
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".popsection\n\t"
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: : "i" (key), "i" (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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asm_volatile_goto("1:\n\t"
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"j %l[l_yes]" "\n\t"
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".pushsection __jump_table, \"aw\"\n\t"
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".quad 1b, %l[l_yes], %0 + %1 \n\t"
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".popsection\n\t"
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: : "i" (key), "i" (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 u64 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 /* _ASM_TILE_JUMP_LABEL_H */
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