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47 lines
1.0 KiB
47 lines
1.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/kernel.h> |
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#include <linux/types.h> |
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#include <linux/mutex.h> |
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#include <linux/cpu.h> |
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#include <linux/jump_label.h> |
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#include <linux/memory.h> |
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#include <asm/cacheflush.h> |
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void arch_jump_label_transform(struct jump_entry *entry, |
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enum jump_label_type type) |
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{ |
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u32 *insn = (u32 *) (unsigned long) entry->code; |
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u32 val; |
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if (type == JUMP_LABEL_JMP) { |
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s32 off = (s32)entry->target - (s32)entry->code; |
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bool use_v9_branch = false; |
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BUG_ON(off & 3); |
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#ifdef CONFIG_SPARC64 |
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if (off <= 0xfffff && off >= -0x100000) |
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use_v9_branch = true; |
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#endif |
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if (use_v9_branch) { |
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/* WDISP19 - target is . + immed << 2 */ |
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/* ba,pt %xcc, . + off */ |
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val = 0x10680000 | (((u32) off >> 2) & 0x7ffff); |
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} else { |
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/* WDISP22 - target is . + immed << 2 */ |
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BUG_ON(off > 0x7fffff); |
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BUG_ON(off < -0x800000); |
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/* ba . + off */ |
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val = 0x10800000 | (((u32) off >> 2) & 0x3fffff); |
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} |
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} else { |
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val = 0x01000000; |
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} |
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mutex_lock(&text_mutex); |
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*insn = val; |
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flushi(insn); |
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mutex_unlock(&text_mutex); |
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}
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