| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | #include <linux/memory.h> |
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| 3 | #include <linux/static_call.h> |
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| 4 | |
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| 5 | #include <asm/code-patching.h> |
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| 6 | |
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| 7 | void arch_static_call_transform(void *site, void *tramp, void *func, bool tail) |
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| 8 | { |
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| 9 | int err; |
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| 10 | bool is_ret0 = (func == __static_call_return0); |
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| 11 | unsigned long target = (unsigned long)(is_ret0 ? tramp + PPC_SCT_RET0 : func); |
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| 12 | bool is_short = is_offset_in_branch_range((long)target - (long)tramp); |
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| 13 | |
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| 14 | if (!tramp) |
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| 15 | return; |
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| 16 | |
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| 17 | mutex_lock(&text_mutex); |
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| 18 | |
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| 19 | if (func && !is_short) { |
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| 20 | err = patch_instruction(tramp + PPC_SCT_DATA, ppc_inst(target)); |
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| 21 | if (err) |
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| 22 | goto out; |
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| 23 | } |
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| 24 | |
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| 25 | if (!func) |
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| 26 | err = patch_instruction(tramp, ppc_inst(PPC_RAW_BLR())); |
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| 27 | else if (is_short) |
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| 28 | err = patch_branch(tramp, target, 0); |
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| 29 | else |
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| 30 | err = patch_instruction(tramp, ppc_inst(PPC_RAW_NOP())); |
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| 31 | out: |
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| 32 | mutex_unlock(lock: &text_mutex); |
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| 33 | |
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| 34 | if (err) |
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| 35 | panic(fmt: "%s: patching failed %pS at %pS\n" , __func__, func, tramp); |
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| 36 | } |
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| 37 | EXPORT_SYMBOL_GPL(arch_static_call_transform); |
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| 38 | |
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