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37 lines
949 B
37 lines
949 B
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/memory.h> |
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#include <linux/static_call.h> |
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#include <asm/code-patching.h> |
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void arch_static_call_transform(void *site, void *tramp, void *func, bool tail) |
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{ |
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int err; |
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bool is_ret0 = (func == __static_call_return0); |
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unsigned long target = (unsigned long)(is_ret0 ? tramp + PPC_SCT_RET0 : func); |
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bool is_short = is_offset_in_branch_range((long)target - (long)tramp); |
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if (!tramp) |
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return; |
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mutex_lock(&text_mutex); |
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if (func && !is_short) { |
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err = patch_instruction(tramp + PPC_SCT_DATA, ppc_inst(target)); |
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if (err) |
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goto out; |
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} |
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if (!func) |
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err = patch_instruction(tramp, ppc_inst(PPC_RAW_BLR())); |
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else if (is_short) |
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err = patch_branch(tramp, target, 0); |
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else |
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err = patch_instruction(tramp, ppc_inst(PPC_RAW_NOP())); |
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out: |
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mutex_unlock(&text_mutex); |
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if (err) |
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panic("%s: patching failed %pS at %pS\n", __func__, func, tramp); |
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} |
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EXPORT_SYMBOL_GPL(arch_static_call_transform);
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