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