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author | Zhigang Lu <zlu@ezchip.com> | 2015-09-30 02:11:45 (GMT) |
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committer | Chris Metcalf <cmetcalf@ezchip.com> | 2016-01-04 20:09:31 (GMT) |
commit | 65a792e84f25d1436698f999224b2cf5d7594546 (patch) | |
tree | fe87043a2d810dbb94fde139db4f6ea3da0e0a25 /arch/tile/include/asm/jump_label.h | |
parent | f419e6f63c5afea00d7c17ebf54f2d265f5c4d7e (diff) | |
download | linux-65a792e84f25d1436698f999224b2cf5d7594546.tar.xz |
tile/jump_label: add jump label support for TILE-Gx
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>
Diffstat (limited to 'arch/tile/include/asm/jump_label.h')
-rw-r--r-- | arch/tile/include/asm/jump_label.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/tile/include/asm/jump_label.h b/arch/tile/include/asm/jump_label.h new file mode 100644 index 0000000..cde7573 --- /dev/null +++ b/arch/tile/include/asm/jump_label.h @@ -0,0 +1,58 @@ +/* + * Copyright 2015 Tilera Corporation. All Rights Reserved. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, version 2. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for + * more details. + */ + +#ifndef _ASM_TILE_JUMP_LABEL_H +#define _ASM_TILE_JUMP_LABEL_H + +#include <arch/opcode.h> + +#define JUMP_LABEL_NOP_SIZE TILE_BUNDLE_SIZE_IN_BYTES + +static __always_inline bool arch_static_branch(struct static_key *key, + bool branch) +{ + asm_volatile_goto("1:\n\t" + "nop" "\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + ".quad 1b, %l[l_yes], %0 + %1 \n\t" + ".popsection\n\t" + : : "i" (key), "i" (branch) : : l_yes); + return false; +l_yes: + return true; +} + +static __always_inline bool arch_static_branch_jump(struct static_key *key, + bool branch) +{ + asm_volatile_goto("1:\n\t" + "j %l[l_yes]" "\n\t" + ".pushsection __jump_table, \"aw\"\n\t" + ".quad 1b, %l[l_yes], %0 + %1 \n\t" + ".popsection\n\t" + : : "i" (key), "i" (branch) : : l_yes); + return false; +l_yes: + return true; +} + +typedef u64 jump_label_t; + +struct jump_entry { + jump_label_t code; + jump_label_t target; + jump_label_t key; +}; + +#endif /* _ASM_TILE_JUMP_LABEL_H */ |