| 1 | // SPDX-License-Identifier: GPL-2.0 |
|---|---|
| 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 | |
| 10 | #include <asm/cacheflush.h> |
| 11 | |
| 12 | void arch_jump_label_transform(struct jump_entry *entry, |
| 13 | enum jump_label_type type) |
| 14 | { |
| 15 | u32 *insn = (u32 *) (unsigned long) entry->code; |
| 16 | u32 val; |
| 17 | |
| 18 | if (type == JUMP_LABEL_JMP) { |
| 19 | s32 off = (s32)entry->target - (s32)entry->code; |
| 20 | bool use_v9_branch = false; |
| 21 | |
| 22 | BUG_ON(off & 3); |
| 23 | |
| 24 | #ifdef CONFIG_SPARC64 |
| 25 | if (off <= 0xfffff && off >= -0x100000) |
| 26 | use_v9_branch = true; |
| 27 | #endif |
| 28 | if (use_v9_branch) { |
| 29 | /* WDISP19 - target is . + immed << 2 */ |
| 30 | /* ba,pt %xcc, . + off */ |
| 31 | val = 0x10680000 | (((u32) off >> 2) & 0x7ffff); |
| 32 | } else { |
| 33 | /* WDISP22 - target is . + immed << 2 */ |
| 34 | BUG_ON(off > 0x7fffff); |
| 35 | BUG_ON(off < -0x800000); |
| 36 | /* ba . + off */ |
| 37 | val = 0x10800000 | (((u32) off >> 2) & 0x3fffff); |
| 38 | } |
| 39 | } else { |
| 40 | val = 0x01000000; |
| 41 | } |
| 42 | |
| 43 | mutex_lock(&text_mutex); |
| 44 | *insn = val; |
| 45 | flushi(insn); |
| 46 | mutex_unlock(lock: &text_mutex); |
| 47 | } |
| 48 |