The EMIT6_DISP_LH macro passes the "disp" parameter to the _EMIT6_DISP_LH
macro. The _EMIT6_DISP_LH macro uses the "disp" parameter twice:
unsigned int __disp_h = ((u32)disp) & 0xff000;
unsigned int __disp_l = ((u32)disp) & 0x00fff;
The EMIT6_DISP_LH is used several times with EMIT_CONST_U64() as "disp"
parameter. Therefore always two constants are created per usage of
EMIT6_DISP_LH.
Fix this and add variable "__disp" to avoid multiple expansions.
Fixes: 054623105728 ("s390/bpf: Add s390x eBPF JIT compiler backend")
Signed-off-by: Michael Holzheu <holzheu@xxxxxxxxxxxxxxxxxx>
---
arch/s390/net/bpf_jit_comp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 01ad166..de0f0bc 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -221,8 +221,9 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
#define EMIT6_DISP_LH(op1, op2, b1, b2, b3, disp) \
({ \
+ int __disp = (disp); \
_EMIT6_DISP_LH(op1 | reg(b1, b2) << 16 | \
- reg_high(b3) << 8, op2, disp); \
+ reg_high(b3) << 8, op2, __disp); \
REG_SET_SEEN(b1); \
REG_SET_SEEN(b2); \
REG_SET_SEEN(b3); \
--
2.3.8
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