summaryrefslogtreecommitdiff
path: root/arch/s390
diff options
context:
space:
mode:
authorIlya Leoshkevich <iii@linux.ibm.com>2020-09-10 01:21:41 +0200
committerAlexei Starovoitov <ast@kernel.org>2020-09-14 18:21:31 -0700
commitd72714c1da138e6755d3bd14662dc5b7f17fae7f (patch)
tree2189c79bb786aa66f50823217cdc9c3e91b392fd /arch/s390
parent2bab48c5bef00d103085da71a01da27ec7200c08 (diff)
s390/bpf: Fix multiple tail calls
In order to branch around tail calls (due to out-of-bounds index, exceeding tail call count or missing tail call target), JIT uses label[0] field, which contains the address of the instruction following the tail call. When there are multiple tail calls, label[0] value comes from handling of a previous tail call, which is incorrect. Fix by getting rid of label array and resolving the label address locally: for all 3 branches that jump to it, emit 0 offsets at the beginning, and then backpatch them with the correct value. Also, do not use the long jump infrastructure: the tail call sequence is known to be short, so make all 3 jumps short. Fixes: 6651ee070b31 ("s390/bpf: implement bpf_tail_call() helper") Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200909232141.3099367-1-iii@linux.ibm.com
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/net/bpf_jit_comp.c61
1 files changed, 27 insertions, 34 deletions
diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index be4b8532dd3c..0a4182792876 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -50,7 +50,6 @@ struct bpf_jit {
int r14_thunk_ip; /* Address of expoline thunk for 'br %r14' */
int tail_call_start; /* Tail call start offset */
int excnt; /* Number of exception table entries */
- int labels[1]; /* Labels for local jumps */
};
#define SEEN_MEM BIT(0) /* use mem[] for temporary storage */
@@ -229,18 +228,18 @@ static inline void reg_set_seen(struct bpf_jit *jit, u32 b1)
REG_SET_SEEN(b3); \
})
-#define EMIT6_PCREL_LABEL(op1, op2, b1, b2, label, mask) \
+#define EMIT6_PCREL_RIEB(op1, op2, b1, b2, mask, target) \
({ \
- int rel = (jit->labels[label] - jit->prg) >> 1; \
+ unsigned int rel = (int)((target) - jit->prg) / 2; \
_EMIT6((op1) | reg(b1, b2) << 16 | (rel & 0xffff), \
(op2) | (mask) << 12); \
REG_SET_SEEN(b1); \
REG_SET_SEEN(b2); \
})
-#define EMIT6_PCREL_IMM_LABEL(op1, op2, b1, imm, label, mask) \
+#define EMIT6_PCREL_RIEC(op1, op2, b1, imm, mask, target) \
({ \
- int rel = (jit->labels[label] - jit->prg) >> 1; \
+ unsigned int rel = (int)((target) - jit->prg) / 2; \
_EMIT6((op1) | (reg_high(b1) | (mask)) << 16 | \
(rel & 0xffff), (op2) | ((imm) & 0xff) << 8); \
REG_SET_SEEN(b1); \
@@ -1282,7 +1281,9 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp,
EMIT4(0xb9040000, BPF_REG_0, REG_2);
break;
}
- case BPF_JMP | BPF_TAIL_CALL:
+ case BPF_JMP | BPF_TAIL_CALL: {
+ int patch_1_clrj, patch_2_clij, patch_3_brc;
+
/*
* Implicit input:
* B1: pointer to ctx
@@ -1300,16 +1301,10 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp,
EMIT6_DISP_LH(0xe3000000, 0x0016, REG_W1, REG_0, BPF_REG_2,
offsetof(struct bpf_array, map.max_entries));
/* if ((u32)%b3 >= (u32)%w1) goto out; */
- if (!is_first_pass(jit) && can_use_rel(jit, jit->labels[0])) {
- /* clrj %b3,%w1,0xa,label0 */
- EMIT6_PCREL_LABEL(0xec000000, 0x0077, BPF_REG_3,
- REG_W1, 0, 0xa);
- } else {
- /* clr %b3,%w1 */
- EMIT2(0x1500, BPF_REG_3, REG_W1);
- /* brcl 0xa,label0 */
- EMIT6_PCREL_RILC(0xc0040000, 0xa, jit->labels[0]);
- }
+ /* clrj %b3,%w1,0xa,out */
+ patch_1_clrj = jit->prg;
+ EMIT6_PCREL_RIEB(0xec000000, 0x0077, BPF_REG_3, REG_W1, 0xa,
+ jit->prg);
/*
* if (tail_call_cnt++ > MAX_TAIL_CALL_CNT)
@@ -1324,16 +1319,10 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp,
EMIT4_IMM(0xa7080000, REG_W0, 1);
/* laal %w1,%w0,off(%r15) */
EMIT6_DISP_LH(0xeb000000, 0x00fa, REG_W1, REG_W0, REG_15, off);
- if (!is_first_pass(jit) && can_use_rel(jit, jit->labels[0])) {
- /* clij %w1,MAX_TAIL_CALL_CNT,0x2,label0 */
- EMIT6_PCREL_IMM_LABEL(0xec000000, 0x007f, REG_W1,
- MAX_TAIL_CALL_CNT, 0, 0x2);
- } else {
- /* clfi %w1,MAX_TAIL_CALL_CNT */
- EMIT6_IMM(0xc20f0000, REG_W1, MAX_TAIL_CALL_CNT);
- /* brcl 0x2,label0 */
- EMIT6_PCREL_RILC(0xc0040000, 0x2, jit->labels[0]);
- }
+ /* clij %w1,MAX_TAIL_CALL_CNT,0x2,out */
+ patch_2_clij = jit->prg;
+ EMIT6_PCREL_RIEC(0xec000000, 0x007f, REG_W1, MAX_TAIL_CALL_CNT,
+ 2, jit->prg);
/*
* prog = array->ptrs[index];
@@ -1348,13 +1337,9 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp,
/* ltg %r1,prog(%b2,%r1) */
EMIT6_DISP_LH(0xe3000000, 0x0002, REG_1, BPF_REG_2,
REG_1, offsetof(struct bpf_array, ptrs));
- if (!is_first_pass(jit) && can_use_rel(jit, jit->labels[0])) {
- /* brc 0x8,label0 */
- EMIT4_PCREL_RIC(0xa7040000, 0x8, jit->labels[0]);
- } else {
- /* brcl 0x8,label0 */
- EMIT6_PCREL_RILC(0xc0040000, 0x8, jit->labels[0]);
- }
+ /* brc 0x8,out */
+ patch_3_brc = jit->prg;
+ EMIT4_PCREL_RIC(0xa7040000, 8, jit->prg);
/*
* Restore registers before calling function
@@ -1371,8 +1356,16 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp,
/* bc 0xf,tail_call_start(%r1) */
_EMIT4(0x47f01000 + jit->tail_call_start);
/* out: */
- jit->labels[0] = jit->prg;
+ if (jit->prg_buf) {
+ *(u16 *)(jit->prg_buf + patch_1_clrj + 2) =
+ (jit->prg - patch_1_clrj) >> 1;
+ *(u16 *)(jit->prg_buf + patch_2_clij + 2) =
+ (jit->prg - patch_2_clij) >> 1;
+ *(u16 *)(jit->prg_buf + patch_3_brc + 2) =
+ (jit->prg - patch_3_brc) >> 1;
+ }
break;
+ }
case BPF_JMP | BPF_EXIT: /* return b0 */
last = (i == fp->len - 1) ? 1 : 0;
if (last)