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[bpf-next,v2,05/11] s390/bpf: Land on the next JITed instruction after exception

Message ID 20240701133432.3883-6-iii@linux.ibm.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series s390/bpf: Implement arena | expand

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netdev/series_format success Posting correctly formatted
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netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 12 maintainers not CCed: yonghong.song@linux.dev svens@linux.ibm.com haoluo@google.com linux-s390@vger.kernel.org jolsa@kernel.org song@kernel.org john.fastabend@gmail.com eddyz87@gmail.com kpsingh@kernel.org martin.lau@linux.dev sdf@google.com borntraeger@linux.ibm.com
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Commit Message

Ilya Leoshkevich July 1, 2024, 1:24 p.m. UTC 
Currently we land on the nop, which is unnecessary: we can just as well
begin executing the next instruction. Furthermore, the upcoming arena
support for the loop-based BPF_XCHG implementation will require landing
on an instruction that comes after the loop.

So land on the next JITed instruction, which covers both cases.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 arch/s390/net/bpf_jit_comp.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 582fa3830772..ecd53f8f0602 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -747,10 +747,11 @@  static int bpf_jit_probe_post(struct bpf_jit *jit, struct bpf_prog *fp,
 			return -1;
 		ex->insn = delta;
 		/*
-		 * Always land on the nop. Note that extable infrastructure
-		 * ignores fixup field, it is handled by ex_handler_bpf().
+		 * Land on the current instruction. Note that the extable
+		 * infrastructure ignores the fixup field; it is handled by
+		 * ex_handler_bpf().
 		 */
-		delta = jit->prg_buf + probe->nop_prg - (u8 *)&ex->fixup;
+		delta = jit->prg_buf + jit->prg - (u8 *)&ex->fixup;
 		if (WARN_ON_ONCE(delta < INT_MIN || delta > INT_MAX))
 			/* JIT bug - landing pad and extable must be close. */
 			return -1;