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s390/ftrace: move hotpatch trampolines to mcount.S

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Move the ftrace hotpatch trampolines to mcount.S. This allows to make
use of the standard SYM_CODE macros which again makes sure that the
hotpatch trampolines follow the function alignment rules of the rest
of the kernel.

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2023-03-13 13:50:36 +01:00
parent 6ef55060a1
commit dfa2a72cdb
2 changed files with 16 additions and 20 deletions
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20
arch/s390/kernel/ftrace.c
View File

@ -49,26 +49,6 @@ struct ftrace_insn {
s32 disp;
} __packed;
asm(
" .align 16\n"
"ftrace_shared_hotpatch_trampoline_br:\n"
" lmg %r0,%r1,2(%r1)\n"
" br %r1\n"
"ftrace_shared_hotpatch_trampoline_br_end:\n"
);
#ifdef CONFIG_EXPOLINE
asm(
" .align 16\n"
"ftrace_shared_hotpatch_trampoline_exrl:\n"
" lmg %r0,%r1,2(%r1)\n"
" exrl %r0,0f\n"
" j .\n"
"0: br %r1\n"
"ftrace_shared_hotpatch_trampoline_exrl_end:\n"
);
#endif /* CONFIG_EXPOLINE */
#ifdef CONFIG_MODULES
static char *ftrace_plt;
#endif /* CONFIG_MODULES */

16
arch/s390/kernel/mcount.S
View File

@ -135,6 +135,22 @@ SYM_FUNC_END(return_to_handler)
#endif
#endif /* CONFIG_FUNCTION_TRACER */
SYM_CODE_START(ftrace_shared_hotpatch_trampoline_br)
lmg %r0,%r1,2(%r1)
br %r1
SYM_INNER_LABEL(ftrace_shared_hotpatch_trampoline_br_end, SYM_L_GLOBAL)
SYM_CODE_END(ftrace_shared_hotpatch_trampoline_br)
#ifdef CONFIG_EXPOLINE
SYM_CODE_START(ftrace_shared_hotpatch_trampoline_exrl)
lmg %r0,%r1,2(%r1)
exrl %r0,0f
j .
0: br %r1
SYM_INNER_LABEL(ftrace_shared_hotpatch_trampoline_exrl_end, SYM_L_GLOBAL)
SYM_CODE_END(ftrace_shared_hotpatch_trampoline_exrl)
#endif /* CONFIG_EXPOLINE */
#ifdef CONFIG_RETHOOK
SYM_FUNC_START(arch_rethook_trampoline)