Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
// 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/text-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 _tramp = (unsigned long)tramp;
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unsigned long _func = (unsigned long)func;
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unsigned long _ret0 = _tramp + PPC_SCT_RET0;
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bool is_short = is_offset_in_branch_range((long)func - (long)(site ? : tramp));
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mutex_lock(&text_mutex);
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if (site && tail) {
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if (!func)
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err = patch_instruction(site, ppc_inst(PPC_RAW_BLR()));
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else if (is_ret0)
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err = patch_branch(site, _ret0, 0);
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else if (is_short)
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err = patch_branch(site, _func, 0);
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else if (tramp)
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err = patch_branch(site, _tramp, 0);
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else
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err = 0;
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} else if (site) {
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if (!func)
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err = patch_instruction(site, ppc_inst(PPC_RAW_NOP()));
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else if (is_ret0)
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err = patch_instruction(site, ppc_inst(PPC_RAW_LI(_R3, 0)));
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else if (is_short)
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err = patch_branch(site, _func, BRANCH_SET_LINK);
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else if (tramp)
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err = patch_branch(site, _tramp, BRANCH_SET_LINK);
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else
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err = 0;
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} else if (tramp) {
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if (func && !is_short) {
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err = patch_ulong(tramp + PPC_SCT_DATA, _func);
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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_ret0)
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err = patch_branch(tramp, _ret0, 0);
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else if (is_short)
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err = patch_branch(tramp, _func, 0);
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else
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err = patch_instruction(tramp, ppc_inst(PPC_RAW_NOP()));
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} else {
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err = 0;
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}
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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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