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Diffstat (limited to 'arch/x86/net/bpf_jit_comp32.c')
-rw-r--r--arch/x86/net/bpf_jit_comp32.c28
1 files changed, 22 insertions, 6 deletions
diff --git a/arch/x86/net/bpf_jit_comp32.c b/arch/x86/net/bpf_jit_comp32.c
index 4d2a7a764602..66cd150b7e54 100644
--- a/arch/x86/net/bpf_jit_comp32.c
+++ b/arch/x86/net/bpf_jit_comp32.c
@@ -1847,14 +1847,16 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
case BPF_B:
case BPF_H:
case BPF_W:
- if (!bpf_prog->aux->verifier_zext)
+ if (bpf_prog->aux->verifier_zext)
break;
if (dstk) {
EMIT3(0xC7, add_1reg(0x40, IA32_EBP),
STACK_VAR(dst_hi));
EMIT(0x0, 4);
} else {
- EMIT3(0xC7, add_1reg(0xC0, dst_hi), 0);
+ /* xor dst_hi,dst_hi */
+ EMIT2(0x33,
+ add_2reg(0xC0, dst_hi, dst_hi));
}
break;
case BPF_DW:
@@ -2013,8 +2015,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
case BPF_JMP | BPF_JSET | BPF_X:
case BPF_JMP32 | BPF_JSET | BPF_X: {
bool is_jmp64 = BPF_CLASS(insn->code) == BPF_JMP;
- u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
- u8 dreg_hi = dstk ? IA32_EDX : dst_hi;
+ u8 dreg_lo = IA32_EAX;
+ u8 dreg_hi = IA32_EDX;
u8 sreg_lo = sstk ? IA32_ECX : src_lo;
u8 sreg_hi = sstk ? IA32_EBX : src_hi;
@@ -2026,6 +2028,13 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
add_2reg(0x40, IA32_EBP,
IA32_EDX),
STACK_VAR(dst_hi));
+ } else {
+ /* mov dreg_lo,dst_lo */
+ EMIT2(0x89, add_2reg(0xC0, dreg_lo, dst_lo));
+ if (is_jmp64)
+ /* mov dreg_hi,dst_hi */
+ EMIT2(0x89,
+ add_2reg(0xC0, dreg_hi, dst_hi));
}
if (sstk) {
@@ -2050,8 +2059,8 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
case BPF_JMP | BPF_JSET | BPF_K:
case BPF_JMP32 | BPF_JSET | BPF_K: {
bool is_jmp64 = BPF_CLASS(insn->code) == BPF_JMP;
- u8 dreg_lo = dstk ? IA32_EAX : dst_lo;
- u8 dreg_hi = dstk ? IA32_EDX : dst_hi;
+ u8 dreg_lo = IA32_EAX;
+ u8 dreg_hi = IA32_EDX;
u8 sreg_lo = IA32_ECX;
u8 sreg_hi = IA32_EBX;
u32 hi;
@@ -2064,6 +2073,13 @@ static int do_jit(struct bpf_prog *bpf_prog, int *addrs, u8 *image,
add_2reg(0x40, IA32_EBP,
IA32_EDX),
STACK_VAR(dst_hi));
+ } else {
+ /* mov dreg_lo,dst_lo */
+ EMIT2(0x89, add_2reg(0xC0, dreg_lo, dst_lo));
+ if (is_jmp64)
+ /* mov dreg_hi,dst_hi */
+ EMIT2(0x89,
+ add_2reg(0xC0, dreg_hi, dst_hi));
}
/* mov ecx,imm32 */