projects / thirdparty / kernel / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| dff9d3c2 DM |
2 | #include <linux/kernel.h> |
| 3 | #include <linux/types.h> | |
| 4 | #include <linux/mutex.h> | |
| 5 | #include <linux/cpu.h> | |
| 6 | ||
| 7 | #include <linux/jump_label.h> | |
| 8 | #include <linux/memory.h> | |
| 9 | ||
| 8befc9f2 DM |
10 | #include <asm/cacheflush.h> |
| 11 | ||
| dff9d3c2 DM |
12 | #ifdef HAVE_JUMP_LABEL |
| 13 | ||
| 14 | void arch_jump_label_transform(struct jump_entry *entry, | |
| 15 | enum jump_label_type type) | |
| 16 | { | |
| dff9d3c2 | 17 | u32 *insn = (u32 *) (unsigned long) entry->code; |
| 9d9fa230 | 18 | u32 val; |
| dff9d3c2 | 19 | |
| 76b235c6 | 20 | if (type == JUMP_LABEL_JMP) { |
| dff9d3c2 | 21 | s32 off = (s32)entry->target - (s32)entry->code; |
| 9d9fa230 JC |
22 | bool use_v9_branch = false; |
| 23 | ||
| 24 | BUG_ON(off & 3); | |
| dff9d3c2 DM |
25 | |
| 26 | #ifdef CONFIG_SPARC64 | |
| 9d9fa230 JC |
27 | if (off <= 0xfffff && off >= -0x100000) |
| 28 | use_v9_branch = true; | |
| dff9d3c2 | 29 | #endif |
| 9d9fa230 JC |
30 | if (use_v9_branch) { |
| 31 | /* WDISP19 - target is . + immed << 2 */ | |
| 32 | /* ba,pt %xcc, . + off */ | |
| 33 | val = 0x10680000 | (((u32) off >> 2) & 0x7ffff); | |
| 34 | } else { | |
| 35 | /* WDISP22 - target is . + immed << 2 */ | |
| 36 | BUG_ON(off > 0x7fffff); | |
| 37 | BUG_ON(off < -0x800000); | |
| 38 | /* ba . + off */ | |
| 39 | val = 0x10800000 | (((u32) off >> 2) & 0x3fffff); | |
| 40 | } | |
| dff9d3c2 DM |
41 | } else { |
| 42 | val = 0x01000000; | |
| 43 | } | |
| 44 | ||
| dff9d3c2 DM |
45 | mutex_lock(&text_mutex); |
| 46 | *insn = val; | |
| 47 | flushi(insn); | |
| 48 | mutex_unlock(&text_mutex); | |
| dff9d3c2 DM |
49 | } |
| 50 | ||
| dff9d3c2 | 51 | #endif |