mirror of
https://github.com/torvalds/linux.git
synced 2024-12-02 00:51:44 +00:00
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
1001 B
C
35 lines
1001 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
#include <linux/rethook.h>
|
|
#include <linux/kprobes.h>
|
|
#include "rethook.h"
|
|
|
|
void arch_rethook_prepare(struct rethook_node *rh, struct pt_regs *regs, bool mcount)
|
|
{
|
|
rh->ret_addr = regs->gprs[14];
|
|
rh->frame = regs->gprs[15];
|
|
|
|
/* Replace the return addr with trampoline addr */
|
|
regs->gprs[14] = (unsigned long)&arch_rethook_trampoline;
|
|
}
|
|
NOKPROBE_SYMBOL(arch_rethook_prepare);
|
|
|
|
void arch_rethook_fixup_return(struct pt_regs *regs,
|
|
unsigned long correct_ret_addr)
|
|
{
|
|
/* Replace fake return address with real one. */
|
|
regs->gprs[14] = correct_ret_addr;
|
|
}
|
|
NOKPROBE_SYMBOL(arch_rethook_fixup_return);
|
|
|
|
/*
|
|
* Called from arch_rethook_trampoline
|
|
*/
|
|
unsigned long arch_rethook_trampoline_callback(struct pt_regs *regs)
|
|
{
|
|
return rethook_trampoline_handler(regs, regs->gprs[15]);
|
|
}
|
|
NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
|
|
|
|
/* assembler function that handles the rethook must not be probed itself */
|
|
NOKPROBE_SYMBOL(arch_rethook_trampoline);
|