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| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2020-06-30 20:52:03 +0200 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2020-07-20 10:55:50 +0200 |
| commit | 05a68e892e89c97df6650cd8cc55058002657cbc (patch) | |
| tree | 50da3706b76870f99a1acf549c9cbf4227388baf /arch/s390/kernel/traps.c | |
| parent | s390/kernel: unify EX_TABLE* implementations (diff) | |
| download | linux-05a68e892e89c97df6650cd8cc55058002657cbc.tar.xz linux-05a68e892e89c97df6650cd8cc55058002657cbc.zip | |
s390/kernel: expand exception table logic to allow new handling options
This is a s390 port of commit 548acf19234d ("x86/mm: Expand the
exception table logic to allow new handling options"), which is needed
for implementing BPF_PROBE_MEM on s390.
The new handler field is made 64-bit in order to allow pointing from
dynamically allocated entries to handlers in kernel text. Unlike on x86,
NULL is used instead of ex_handler_default. This is because exception
tables are used by boot/text_dma.S, and it would be a pain to preserve
ex_handler_default.
The new infrastructure is ignored in early_pgm_check_handler, since
there is no pt_regs.
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/traps.c')
| -rw-r--r-- | arch/s390/kernel/traps.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c index ff9cc4c3290e..8d1e8a1a97df 100644 --- a/arch/s390/kernel/traps.c +++ b/arch/s390/kernel/traps.c @@ -50,11 +50,8 @@ void do_report_trap(struct pt_regs *regs, int si_signo, int si_code, char *str) } else { const struct exception_table_entry *fixup; fixup = s390_search_extables(regs->psw.addr); - if (fixup) - regs->psw.addr = extable_fixup(fixup); - else { + if (!fixup || !ex_handle(fixup, regs)) die(regs, str); - } } } @@ -251,7 +248,7 @@ void monitor_event_exception(struct pt_regs *regs) case BUG_TRAP_TYPE_NONE: fixup = s390_search_extables(regs->psw.addr); if (fixup) - regs->psw.addr = extable_fixup(fixup); + ex_handle(fixup, regs); break; case BUG_TRAP_TYPE_WARN: break; |