Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
David S. Miller | dff9d3c | 2010-09-17 11:09:25 -0400 | [diff] [blame] | 2 | #ifndef _ASM_SPARC_JUMP_LABEL_H |
| 3 | #define _ASM_SPARC_JUMP_LABEL_H |
| 4 | |
Anton Blanchard | 55dd0df | 2015-04-09 13:51:30 +1000 | [diff] [blame] | 5 | #ifndef __ASSEMBLY__ |
David S. Miller | dff9d3c | 2010-09-17 11:09:25 -0400 | [diff] [blame] | 6 | |
| 7 | #include <linux/types.h> |
David S. Miller | dff9d3c | 2010-09-17 11:09:25 -0400 | [diff] [blame] | 8 | |
| 9 | #define JUMP_LABEL_NOP_SIZE 4 |
| 10 | |
Peter Zijlstra | 11276d5 | 2015-07-24 15:09:55 +0200 | [diff] [blame] | 11 | static __always_inline bool arch_static_branch(struct static_key *key, bool branch) |
Jason Baron | d430d3d | 2011-03-16 17:29:47 -0400 | [diff] [blame] | 12 | { |
Peter Zijlstra | 11276d5 | 2015-07-24 15:09:55 +0200 | [diff] [blame] | 13 | asm_volatile_goto("1:\n\t" |
| 14 | "nop\n\t" |
| 15 | "nop\n\t" |
| 16 | ".pushsection __jump_table, \"aw\"\n\t" |
| 17 | ".align 4\n\t" |
| 18 | ".word 1b, %l[l_yes], %c0\n\t" |
| 19 | ".popsection \n\t" |
| 20 | : : "i" (&((char *)key)[branch]) : : l_yes); |
| 21 | |
| 22 | return false; |
| 23 | l_yes: |
| 24 | return true; |
| 25 | } |
| 26 | |
| 27 | static __always_inline bool arch_static_branch_jump(struct static_key *key, bool branch) |
| 28 | { |
| 29 | asm_volatile_goto("1:\n\t" |
| 30 | "b %l[l_yes]\n\t" |
| 31 | "nop\n\t" |
| 32 | ".pushsection __jump_table, \"aw\"\n\t" |
| 33 | ".align 4\n\t" |
| 34 | ".word 1b, %l[l_yes], %c0\n\t" |
| 35 | ".popsection \n\t" |
| 36 | : : "i" (&((char *)key)[branch]) : : l_yes); |
| 37 | |
Jason Baron | d430d3d | 2011-03-16 17:29:47 -0400 | [diff] [blame] | 38 | return false; |
| 39 | l_yes: |
| 40 | return true; |
| 41 | } |
David S. Miller | dff9d3c | 2010-09-17 11:09:25 -0400 | [diff] [blame] | 42 | |
David S. Miller | dff9d3c | 2010-09-17 11:09:25 -0400 | [diff] [blame] | 43 | typedef u32 jump_label_t; |
| 44 | |
| 45 | struct jump_entry { |
| 46 | jump_label_t code; |
| 47 | jump_label_t target; |
| 48 | jump_label_t key; |
| 49 | }; |
| 50 | |
Anton Blanchard | 55dd0df | 2015-04-09 13:51:30 +1000 | [diff] [blame] | 51 | #endif /* __ASSEMBLY__ */ |
David S. Miller | dff9d3c | 2010-09-17 11:09:25 -0400 | [diff] [blame] | 52 | #endif |