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1e2eb49bb1
Compiling the kernel with CONFIG_KPROBES disabled, but CONFIG_RETHOOK
enabled, results in this sparse warning:
arch/s390/kernel/rethook.c:26:15: warning: no previous prototype for 'arch_rethook_trampoline_callback' [-Wmissing-prototypes]
26 | unsigned long arch_rethook_trampoline_callback(struct pt_regs *regs)
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Add a local rethook header file similar to riscv to address this.
Reported-by: kernel test robot <lkp@intel.com>
Fixes: 1a280f48c0 ("s390/kprobes: replace kretprobe with rethook")
Link: https://lore.kernel.org/all/202302030102.69dZIuJk-lkp@intel.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
35 lines
1,001 B
C
35 lines
1,001 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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#include <linux/rethook.h>
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#include <linux/kprobes.h>
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#include "rethook.h"
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void arch_rethook_prepare(struct rethook_node *rh, struct pt_regs *regs, bool mcount)
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{
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rh->ret_addr = regs->gprs[14];
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rh->frame = regs->gprs[15];
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/* Replace the return addr with trampoline addr */
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regs->gprs[14] = (unsigned long)&arch_rethook_trampoline;
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}
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NOKPROBE_SYMBOL(arch_rethook_prepare);
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void arch_rethook_fixup_return(struct pt_regs *regs,
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unsigned long correct_ret_addr)
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{
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/* Replace fake return address with real one. */
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regs->gprs[14] = correct_ret_addr;
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}
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NOKPROBE_SYMBOL(arch_rethook_fixup_return);
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/*
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* Called from arch_rethook_trampoline
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*/
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unsigned long arch_rethook_trampoline_callback(struct pt_regs *regs)
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{
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return rethook_trampoline_handler(regs, regs->gprs[15]);
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}
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NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
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/* assembler function that handles the rethook must not be probed itself */
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NOKPROBE_SYMBOL(arch_rethook_trampoline);
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