38 lines
949 B
C
38 lines
949 B
C
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// 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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