@@ -705,9 +705,6 @@ static int bpf_jit_blind_insn(const struct bpf_insn *from,
* below.
*
* Constant blinding is only used by JITs, not in the interpreter.
- * The interpreter uses AX in some occasions as a local temporary
- * register e.g. in DIV or MOD instructions.
- *
* In restricted circumstances, the verifier can also use the AX
* register for rewrites as long as they do not interfere with
* the above cases!
@@ -1057,6 +1054,7 @@ static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn, u64 *stack)
#undef BPF_INSN_3_LBL
#undef BPF_INSN_2_LBL
u32 tail_call_cnt = 0;
+ u64 tmp;
#define CONT ({ insn++; goto select_insn; })
#define CONT_JMP ({ insn++; goto select_insn; })
@@ -1117,36 +1115,36 @@ static u64 ___bpf_prog_run(u64 *regs, const struct bpf_insn *insn, u64 *stack)
(*(s64 *) &DST) >>= IMM;
CONT;
ALU64_MOD_X:
- div64_u64_rem(DST, SRC, &AX);
- DST = AX;
+ div64_u64_rem(DST, SRC, &tmp);
+ DST = tmp;
CONT;
ALU_MOD_X:
- AX = (u32) DST;
- DST = do_div(AX, (u32) SRC);
+ tmp = (u32) DST;
+ DST = do_div(tmp, (u32) SRC);
CONT;
ALU64_MOD_K:
- div64_u64_rem(DST, IMM, &AX);
- DST = AX;
+ div64_u64_rem(DST, IMM, &tmp);
+ DST = tmp;
CONT;
ALU_MOD_K:
- AX = (u32) DST;
- DST = do_div(AX, (u32) IMM);
+ tmp = (u32) DST;
+ DST = do_div(tmp, (u32) IMM);
CONT;
ALU64_DIV_X:
DST = div64_u64(DST, SRC);
CONT;
ALU_DIV_X:
- AX = (u32) DST;
- do_div(AX, (u32) SRC);
- DST = (u32) AX;
+ tmp = (u32) DST;
+ do_div(tmp, (u32) SRC);
+ DST = (u32) tmp;
CONT;
ALU64_DIV_K:
DST = div64_u64(DST, IMM);
CONT;
ALU_DIV_K:
- AX = (u32) DST;
- do_div(AX, (u32) IMM);
- DST = (u32) AX;
+ tmp = (u32) DST;
+ do_div(tmp, (u32) IMM);
+ DST = (u32) tmp;
CONT;
ALU_END_TO_BE:
switch (IMM) {