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-rw-r--r--arch/loongarch/net/bpf_jit.c1340
-rw-r--r--arch/loongarch/net/bpf_jit.h41
2 files changed, 1218 insertions, 163 deletions
diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
index ea357a3edc09..24913dc7f4e8 100644
--- a/arch/loongarch/net/bpf_jit.c
+++ b/arch/loongarch/net/bpf_jit.c
@@ -4,13 +4,21 @@
*
* Copyright (C) 2022 Loongson Technology Corporation Limited
*/
+#include <linux/memory.h>
#include "bpf_jit.h"
-#define REG_TCC LOONGARCH_GPR_A6
-#define TCC_SAVED LOONGARCH_GPR_S5
+#define LOONGARCH_MAX_REG_ARGS 8
+
+#define LOONGARCH_LONG_JUMP_NINSNS 5
+#define LOONGARCH_LONG_JUMP_NBYTES (LOONGARCH_LONG_JUMP_NINSNS * 4)
-#define SAVE_RA BIT(0)
-#define SAVE_TCC BIT(1)
+#define LOONGARCH_FENTRY_NINSNS 2
+#define LOONGARCH_FENTRY_NBYTES (LOONGARCH_FENTRY_NINSNS * 4)
+#define LOONGARCH_BPF_FENTRY_NBYTES (LOONGARCH_LONG_JUMP_NINSNS * 4)
+
+#define REG_TCC LOONGARCH_GPR_A6
+#define REG_ARENA LOONGARCH_GPR_S6 /* For storing arena_vm_start */
+#define BPF_TAIL_CALL_CNT_PTR_STACK_OFF(stack) (round_up(stack, 16) - 80)
static const int regmap[] = {
/* return value from in-kernel function, and exit value for eBPF program */
@@ -32,32 +40,57 @@ static const int regmap[] = {
[BPF_REG_AX] = LOONGARCH_GPR_T0,
};
-static void mark_call(struct jit_ctx *ctx)
+static void prepare_bpf_tail_call_cnt(struct jit_ctx *ctx, int *store_offset)
{
- ctx->flags |= SAVE_RA;
-}
+ const struct bpf_prog *prog = ctx->prog;
+ const bool is_main_prog = !bpf_is_subprog(prog);
-static void mark_tail_call(struct jit_ctx *ctx)
-{
- ctx->flags |= SAVE_TCC;
-}
+ if (is_main_prog) {
+ /*
+ * LOONGARCH_GPR_T3 = MAX_TAIL_CALL_CNT
+ * if (REG_TCC > T3 )
+ * std REG_TCC -> LOONGARCH_GPR_SP + store_offset
+ * else
+ * std REG_TCC -> LOONGARCH_GPR_SP + store_offset
+ * REG_TCC = LOONGARCH_GPR_SP + store_offset
+ *
+ * std REG_TCC -> LOONGARCH_GPR_SP + store_offset
+ *
+ * The purpose of this code is to first push the TCC into stack,
+ * and then push the address of TCC into stack.
+ * In cases where bpf2bpf and tailcall are used in combination,
+ * the value in REG_TCC may be a count or an address,
+ * these two cases need to be judged and handled separately.
+ */
+ emit_insn(ctx, addid, LOONGARCH_GPR_T3, LOONGARCH_GPR_ZERO, MAX_TAIL_CALL_CNT);
+ *store_offset -= sizeof(long);
-static bool seen_call(struct jit_ctx *ctx)
-{
- return (ctx->flags & SAVE_RA);
-}
+ emit_cond_jmp(ctx, BPF_JGT, REG_TCC, LOONGARCH_GPR_T3, 4);
-static bool seen_tail_call(struct jit_ctx *ctx)
-{
- return (ctx->flags & SAVE_TCC);
-}
+ /*
+ * If REG_TCC < MAX_TAIL_CALL_CNT, the value in REG_TCC is a count,
+ * push tcc into stack
+ */
+ emit_insn(ctx, std, REG_TCC, LOONGARCH_GPR_SP, *store_offset);
-static u8 tail_call_reg(struct jit_ctx *ctx)
-{
- if (seen_call(ctx))
- return TCC_SAVED;
+ /* Push the address of TCC into the REG_TCC */
+ emit_insn(ctx, addid, REG_TCC, LOONGARCH_GPR_SP, *store_offset);
+
+ emit_uncond_jmp(ctx, 2);
+
+ /*
+ * If REG_TCC > MAX_TAIL_CALL_CNT, the value in REG_TCC is an address,
+ * push tcc_ptr into stack
+ */
+ emit_insn(ctx, std, REG_TCC, LOONGARCH_GPR_SP, *store_offset);
+ } else {
+ *store_offset -= sizeof(long);
+ emit_insn(ctx, std, REG_TCC, LOONGARCH_GPR_SP, *store_offset);
+ }
- return REG_TCC;
+ /* Push tcc_ptr into stack */
+ *store_offset -= sizeof(long);
+ emit_insn(ctx, std, REG_TCC, LOONGARCH_GPR_SP, *store_offset);
}
/*
@@ -80,6 +113,10 @@ static u8 tail_call_reg(struct jit_ctx *ctx)
* | $s4 |
* +-------------------------+
* | $s5 |
+ * +-------------------------+
+ * | tcc |
+ * +-------------------------+
+ * | tcc_ptr |
* +-------------------------+ <--BPF_REG_FP
* | prog->aux->stack_depth |
* | (optional) |
@@ -88,22 +125,36 @@ static u8 tail_call_reg(struct jit_ctx *ctx)
*/
static void build_prologue(struct jit_ctx *ctx)
{
- int stack_adjust = 0, store_offset, bpf_stack_adjust;
+ int i, stack_adjust = 0, store_offset, bpf_stack_adjust;
+ const struct bpf_prog *prog = ctx->prog;
+ const bool is_main_prog = !bpf_is_subprog(prog);
bpf_stack_adjust = round_up(ctx->prog->aux->stack_depth, 16);
- /* To store ra, fp, s0, s1, s2, s3, s4 and s5. */
+ /* To store ra, fp, s0, s1, s2, s3, s4, s5 */
stack_adjust += sizeof(long) * 8;
+ /* To store tcc and tcc_ptr */
+ stack_adjust += sizeof(long) * 2;
+
+ if (ctx->arena_vm_start)
+ stack_adjust += 8;
+
stack_adjust = round_up(stack_adjust, 16);
stack_adjust += bpf_stack_adjust;
+ move_reg(ctx, LOONGARCH_GPR_T0, LOONGARCH_GPR_RA);
+ /* Reserve space for the move_imm + jirl instruction */
+ for (i = 0; i < LOONGARCH_LONG_JUMP_NINSNS; i++)
+ emit_insn(ctx, nop);
+
/*
- * First instruction initializes the tail call count (TCC).
- * On tail call we skip this instruction, and the TCC is
- * passed in REG_TCC from the caller.
+ * First instruction initializes the tail call count (TCC)
+ * register to zero. On tail call we skip this instruction,
+ * and the TCC is passed in REG_TCC from the caller.
*/
- emit_insn(ctx, addid, REG_TCC, LOONGARCH_GPR_ZERO, MAX_TAIL_CALL_CNT);
+ if (is_main_prog)
+ emit_insn(ctx, addid, REG_TCC, LOONGARCH_GPR_ZERO, 0);
emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, -stack_adjust);
@@ -131,19 +182,22 @@ static void build_prologue(struct jit_ctx *ctx)
store_offset -= sizeof(long);
emit_insn(ctx, std, LOONGARCH_GPR_S5, LOONGARCH_GPR_SP, store_offset);
+ if (ctx->arena_vm_start) {
+ store_offset -= sizeof(long);
+ emit_insn(ctx, std, REG_ARENA, LOONGARCH_GPR_SP, store_offset);
+ }
+
+ prepare_bpf_tail_call_cnt(ctx, &store_offset);
+
emit_insn(ctx, addid, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_adjust);
if (bpf_stack_adjust)
emit_insn(ctx, addid, regmap[BPF_REG_FP], LOONGARCH_GPR_SP, bpf_stack_adjust);
- /*
- * Program contains calls and tail calls, so REG_TCC need
- * to be saved across calls.
- */
- if (seen_tail_call(ctx) && seen_call(ctx))
- move_reg(ctx, TCC_SAVED, REG_TCC);
-
ctx->stack_size = stack_adjust;
+
+ if (ctx->arena_vm_start)
+ move_imm(ctx, REG_ARENA, ctx->arena_vm_start, false);
}
static void __build_epilogue(struct jit_ctx *ctx, bool is_tail_call)
@@ -175,6 +229,21 @@ static void __build_epilogue(struct jit_ctx *ctx, bool is_tail_call)
load_offset -= sizeof(long);
emit_insn(ctx, ldd, LOONGARCH_GPR_S5, LOONGARCH_GPR_SP, load_offset);
+ if (ctx->arena_vm_start) {
+ load_offset -= sizeof(long);
+ emit_insn(ctx, ldd, REG_ARENA, LOONGARCH_GPR_SP, load_offset);
+ }
+
+ /*
+ * When push into the stack, follow the order of tcc then tcc_ptr.
+ * When pop from the stack, first pop tcc_ptr then followed by tcc.
+ */
+ load_offset -= 2 * sizeof(long);
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_SP, load_offset);
+
+ load_offset += sizeof(long);
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_SP, load_offset);
+
emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, stack_adjust);
if (!is_tail_call) {
@@ -187,7 +256,7 @@ static void __build_epilogue(struct jit_ctx *ctx, bool is_tail_call)
* Call the next bpf prog and skip the first instruction
* of TCC initialization.
*/
- emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_T3, 1);
+ emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_T3, 7);
}
}
@@ -206,12 +275,10 @@ bool bpf_jit_supports_far_kfunc_call(void)
return true;
}
-/* initialized on the first pass of build_body() */
-static int out_offset = -1;
-static int emit_bpf_tail_call(struct jit_ctx *ctx)
+static int emit_bpf_tail_call(struct jit_ctx *ctx, int insn)
{
- int off;
- u8 tcc = tail_call_reg(ctx);
+ int off, tc_ninsn = 0;
+ int tcc_ptr_off = BPF_TAIL_CALL_CNT_PTR_STACK_OFF(ctx->stack_size);
u8 a1 = LOONGARCH_GPR_A1;
u8 a2 = LOONGARCH_GPR_A2;
u8 t1 = LOONGARCH_GPR_T1;
@@ -220,7 +287,7 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
const int idx0 = ctx->idx;
#define cur_offset (ctx->idx - idx0)
-#define jmp_offset (out_offset - (cur_offset))
+#define jmp_offset (tc_ninsn - (cur_offset))
/*
* a0: &ctx
@@ -230,6 +297,9 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
* if (index >= array->map.max_entries)
* goto out;
*/
+ tc_ninsn = insn ? ctx->offset[insn+1] - ctx->offset[insn] : ctx->offset[0];
+ emit_zext_32(ctx, a2, true);
+
off = offsetof(struct bpf_array, map.max_entries);
emit_insn(ctx, ldwu, t1, a1, off);
/* bgeu $a2, $t1, jmp_offset */
@@ -237,11 +307,15 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
goto toofar;
/*
- * if (--TCC < 0)
- * goto out;
+ * if ((*tcc_ptr)++ >= MAX_TAIL_CALL_CNT)
+ * goto out;
*/
- emit_insn(ctx, addid, REG_TCC, tcc, -1);
- if (emit_tailcall_jmp(ctx, BPF_JSLT, REG_TCC, LOONGARCH_GPR_ZERO, jmp_offset) < 0)
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_SP, tcc_ptr_off);
+ emit_insn(ctx, ldd, t3, REG_TCC, 0);
+ emit_insn(ctx, addid, t3, t3, 1);
+ emit_insn(ctx, std, t3, REG_TCC, 0);
+ emit_insn(ctx, addid, t2, LOONGARCH_GPR_ZERO, MAX_TAIL_CALL_CNT);
+ if (emit_tailcall_jmp(ctx, BPF_JSGT, t3, t2, jmp_offset) < 0)
goto toofar;
/*
@@ -261,15 +335,6 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
emit_insn(ctx, ldd, t3, t2, off);
__build_epilogue(ctx, true);
- /* out: */
- if (out_offset == -1)
- out_offset = cur_offset;
- if (cur_offset != out_offset) {
- pr_err_once("tail_call out_offset = %d, expected %d!\n",
- cur_offset, out_offset);
- return -1;
- }
-
return 0;
toofar:
@@ -279,7 +344,13 @@ toofar:
#undef jmp_offset
}
-static void emit_atomic(const struct bpf_insn *insn, struct jit_ctx *ctx)
+static void emit_store_stack_imm64(struct jit_ctx *ctx, int reg, int stack_off, u64 imm64)
+{
+ move_imm(ctx, reg, imm64, false);
+ emit_insn(ctx, std, reg, LOONGARCH_GPR_FP, stack_off);
+}
+
+static int emit_atomic_rmw(const struct bpf_insn *insn, struct jit_ctx *ctx)
{
const u8 t1 = LOONGARCH_GPR_T1;
const u8 t2 = LOONGARCH_GPR_T2;
@@ -298,10 +369,28 @@ static void emit_atomic(const struct bpf_insn *insn, struct jit_ctx *ctx)
switch (imm) {
/* lock *(size *)(dst + off) <op>= src */
case BPF_ADD:
- if (isdw)
- emit_insn(ctx, amaddd, t2, t1, src);
- else
+ switch (BPF_SIZE(insn->code)) {
+ case BPF_B:
+ if (!cpu_has_lam_bh) {
+ pr_err_once("bpf-jit: amadd.b instruction is not supported\n");
+ return -EINVAL;
+ }
+ emit_insn(ctx, amaddb, t2, t1, src);
+ break;
+ case BPF_H:
+ if (!cpu_has_lam_bh) {
+ pr_err_once("bpf-jit: amadd.h instruction is not supported\n");
+ return -EINVAL;
+ }
+ emit_insn(ctx, amaddh, t2, t1, src);
+ break;
+ case BPF_W:
emit_insn(ctx, amaddw, t2, t1, src);
+ break;
+ case BPF_DW:
+ emit_insn(ctx, amaddd, t2, t1, src);
+ break;
+ }
break;
case BPF_AND:
if (isdw)
@@ -323,11 +412,30 @@ static void emit_atomic(const struct bpf_insn *insn, struct jit_ctx *ctx)
break;
/* src = atomic_fetch_<op>(dst + off, src) */
case BPF_ADD | BPF_FETCH:
- if (isdw) {
- emit_insn(ctx, amaddd, src, t1, t3);
- } else {
+ switch (BPF_SIZE(insn->code)) {
+ case BPF_B:
+ if (!cpu_has_lam_bh) {
+ pr_err_once("bpf-jit: amadd.b instruction is not supported\n");
+ return -EINVAL;
+ }
+ emit_insn(ctx, amaddb, src, t1, t3);
+ emit_zext_32(ctx, src, true);
+ break;
+ case BPF_H:
+ if (!cpu_has_lam_bh) {
+ pr_err_once("bpf-jit: amadd.h instruction is not supported\n");
+ return -EINVAL;
+ }
+ emit_insn(ctx, amaddh, src, t1, t3);
+ emit_zext_32(ctx, src, true);
+ break;
+ case BPF_W:
emit_insn(ctx, amaddw, src, t1, t3);
emit_zext_32(ctx, src, true);
+ break;
+ case BPF_DW:
+ emit_insn(ctx, amaddd, src, t1, t3);
+ break;
}
break;
case BPF_AND | BPF_FETCH:
@@ -356,11 +464,30 @@ static void emit_atomic(const struct bpf_insn *insn, struct jit_ctx *ctx)
break;
/* src = atomic_xchg(dst + off, src); */
case BPF_XCHG:
- if (isdw) {
- emit_insn(ctx, amswapd, src, t1, t3);
- } else {
+ switch (BPF_SIZE(insn->code)) {
+ case BPF_B:
+ if (!cpu_has_lam_bh) {
+ pr_err_once("bpf-jit: amswap.b instruction is not supported\n");
+ return -EINVAL;
+ }
+ emit_insn(ctx, amswapb, src, t1, t3);
+ emit_zext_32(ctx, src, true);
+ break;
+ case BPF_H:
+ if (!cpu_has_lam_bh) {
+ pr_err_once("bpf-jit: amswap.h instruction is not supported\n");
+ return -EINVAL;
+ }
+ emit_insn(ctx, amswaph, src, t1, t3);
+ emit_zext_32(ctx, src, true);
+ break;
+ case BPF_W:
emit_insn(ctx, amswapw, src, t1, t3);
emit_zext_32(ctx, src, true);
+ break;
+ case BPF_DW:
+ emit_insn(ctx, amswapd, src, t1, t3);
+ break;
}
break;
/* r0 = atomic_cmpxchg(dst + off, r0, src); */
@@ -383,7 +510,105 @@ static void emit_atomic(const struct bpf_insn *insn, struct jit_ctx *ctx)
emit_zext_32(ctx, r0, true);
}
break;
+ default:
+ pr_err_once("bpf-jit: invalid atomic read-modify-write opcode %02x\n", imm);
+ return -EINVAL;
}
+
+ return 0;
+}
+
+static int emit_atomic_ld_st(const struct bpf_insn *insn, struct jit_ctx *ctx)
+{
+ const u8 t1 = LOONGARCH_GPR_T1;
+ const u8 src = regmap[insn->src_reg];
+ const u8 dst = regmap[insn->dst_reg];
+ const s16 off = insn->off;
+ const s32 imm = insn->imm;
+
+ switch (imm) {
+ /* dst_reg = load_acquire(src_reg + off16) */
+ case BPF_LOAD_ACQ:
+ switch (BPF_SIZE(insn->code)) {
+ case BPF_B:
+ if (is_signed_imm12(off)) {
+ emit_insn(ctx, ldbu, dst, src, off);
+ } else {
+ move_imm(ctx, t1, off, false);
+ emit_insn(ctx, ldxbu, dst, src, t1);
+ }
+ break;
+ case BPF_H:
+ if (is_signed_imm12(off)) {
+ emit_insn(ctx, ldhu, dst, src, off);
+ } else {
+ move_imm(ctx, t1, off, false);
+ emit_insn(ctx, ldxhu, dst, src, t1);
+ }
+ break;
+ case BPF_W:
+ if (is_signed_imm12(off)) {
+ emit_insn(ctx, ldwu, dst, src, off);
+ } else {
+ move_imm(ctx, t1, off, false);
+ emit_insn(ctx, ldxwu, dst, src, t1);
+ }
+ break;
+ case BPF_DW:
+ if (is_signed_imm12(off)) {
+ emit_insn(ctx, ldd, dst, src, off);
+ } else {
+ move_imm(ctx, t1, off, false);
+ emit_insn(ctx, ldxd, dst, src, t1);
+ }
+ break;
+ }
+ emit_insn(ctx, dbar, 0b10100);
+ break;
+ /* store_release(dst_reg + off16, src_reg) */
+ case BPF_STORE_REL:
+ emit_insn(ctx, dbar, 0b10010);
+ switch (BPF_SIZE(insn->code)) {
+ case BPF_B:
+ if (is_signed_imm12(off)) {
+ emit_insn(ctx, stb, src, dst, off);
+ } else {
+ move_imm(ctx, t1, off, false);
+ emit_insn(ctx, stxb, src, dst, t1);
+ }
+ break;
+ case BPF_H:
+ if (is_signed_imm12(off)) {
+ emit_insn(ctx, sth, src, dst, off);
+ } else {
+ move_imm(ctx, t1, off, false);
+ emit_insn(ctx, stxh, src, dst, t1);
+ }
+ break;
+ case BPF_W:
+ if (is_signed_imm12(off)) {
+ emit_insn(ctx, stw, src, dst, off);
+ } else {
+ move_imm(ctx, t1, off, false);
+ emit_insn(ctx, stxw, src, dst, t1);
+ }
+ break;
+ case BPF_DW:
+ if (is_signed_imm12(off)) {
+ emit_insn(ctx, std, src, dst, off);
+ } else {
+ move_imm(ctx, t1, off, false);
+ emit_insn(ctx, stxd, src, dst, t1);
+ }
+ break;
+ }
+ break;
+ default:
+ pr_err_once("bpf-jit: invalid atomic load/store opcode %02x\n", imm);
+ return -EINVAL;
+ }
+
+ return 0;
}
static bool is_signed_bpf_cond(u8 cond)
@@ -394,6 +619,7 @@ static bool is_signed_bpf_cond(u8 cond)
#define BPF_FIXUP_REG_MASK GENMASK(31, 27)
#define BPF_FIXUP_OFFSET_MASK GENMASK(26, 0)
+#define REG_DONT_CLEAR_MARKER 0
bool ex_handler_bpf(const struct exception_table_entry *ex,
struct pt_regs *regs)
@@ -401,7 +627,8 @@ bool ex_handler_bpf(const struct exception_table_entry *ex,
int dst_reg = FIELD_GET(BPF_FIXUP_REG_MASK, ex->fixup);
off_t offset = FIELD_GET(BPF_FIXUP_OFFSET_MASK, ex->fixup);
- regs->regs[dst_reg] = 0;
+ if (dst_reg != REG_DONT_CLEAR_MARKER)
+ regs->regs[dst_reg] = 0;
regs->csr_era = (unsigned long)&ex->fixup - offset;
return true;
@@ -413,28 +640,33 @@ static int add_exception_handler(const struct bpf_insn *insn,
int dst_reg)
{
unsigned long pc;
- off_t offset;
+ off_t ins_offset, fixup_offset;
struct exception_table_entry *ex;
- if (!ctx->image || !ctx->prog->aux->extable)
+ if (!ctx->image || !ctx->ro_image || !ctx->prog->aux->extable)
return 0;
if (BPF_MODE(insn->code) != BPF_PROBE_MEM &&
- BPF_MODE(insn->code) != BPF_PROBE_MEMSX)
+ BPF_MODE(insn->code) != BPF_PROBE_MEMSX &&
+ BPF_MODE(insn->code) != BPF_PROBE_MEM32)
return 0;
if (WARN_ON_ONCE(ctx->num_exentries >= ctx->prog->aux->num_exentries))
return -EINVAL;
ex = &ctx->prog->aux->extable[ctx->num_exentries];
- pc = (unsigned long)&ctx->image[ctx->idx - 1];
+ pc = (unsigned long)&ctx->ro_image[ctx->idx - 1];
- offset = pc - (long)&ex->insn;
- if (WARN_ON_ONCE(offset >= 0 || offset < INT_MIN))
+ /*
+ * This is the relative offset of the instruction that may fault from
+ * the exception table itself. This will be written to the exception
+ * table and if this instruction faults, the destination register will
+ * be set to '0' and the execution will jump to the next instruction.
+ */
+ ins_offset = pc - (long)&ex->insn;
+ if (WARN_ON_ONCE(ins_offset >= 0 || ins_offset < INT_MIN))
return -ERANGE;
- ex->insn = offset;
-
/*
* Since the extable follows the program, the fixup offset is always
* negative and limited to BPF_JIT_REGION_SIZE. Store a positive value
@@ -442,13 +674,23 @@ static int add_exception_handler(const struct bpf_insn *insn,
* bits. We don't need to worry about buildtime or runtime sort
* modifying the upper bits because the table is already sorted, and
* isn't part of the main exception table.
+ *
+ * The fixup_offset is set to the next instruction from the instruction
+ * that may fault. The execution will jump to this after handling the fault.
*/
- offset = (long)&ex->fixup - (pc + LOONGARCH_INSN_SIZE);
- if (!FIELD_FIT(BPF_FIXUP_OFFSET_MASK, offset))
+ fixup_offset = (long)&ex->fixup - (pc + LOONGARCH_INSN_SIZE);
+ if (!FIELD_FIT(BPF_FIXUP_OFFSET_MASK, fixup_offset))
return -ERANGE;
+ /*
+ * The offsets above have been calculated using the RO buffer but we
+ * need to use the R/W buffer for writes. Switch ex to rw buffer for writing.
+ */
+ ex = (void *)ctx->image + ((void *)ex - (void *)ctx->ro_image);
+ ex->insn = ins_offset;
+ ex->fixup = FIELD_PREP(BPF_FIXUP_OFFSET_MASK, fixup_offset) |
+ FIELD_PREP(BPF_FIXUP_REG_MASK, dst_reg);
ex->type = EX_TYPE_BPF;
- ex->fixup = FIELD_PREP(BPF_FIXUP_OFFSET_MASK, offset) | FIELD_PREP(BPF_FIXUP_REG_MASK, dst_reg);
ctx->num_exentries++;
@@ -461,13 +703,14 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
u64 func_addr;
bool func_addr_fixed, sign_extend;
int i = insn - ctx->prog->insnsi;
- int ret, jmp_offset;
+ int ret, jmp_offset, tcc_ptr_off;
const u8 code = insn->code;
const u8 cond = BPF_OP(code);
const u8 t1 = LOONGARCH_GPR_T1;
const u8 t2 = LOONGARCH_GPR_T2;
- const u8 src = regmap[insn->src_reg];
- const u8 dst = regmap[insn->dst_reg];
+ const u8 t3 = LOONGARCH_GPR_T3;
+ u8 src = regmap[insn->src_reg];
+ u8 dst = regmap[insn->dst_reg];
const s16 off = insn->off;
const s32 imm = insn->imm;
const bool is32 = BPF_CLASS(insn->code) == BPF_ALU || BPF_CLASS(insn->code) == BPF_JMP32;
@@ -476,19 +719,26 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
/* dst = src */
case BPF_ALU | BPF_MOV | BPF_X:
case BPF_ALU64 | BPF_MOV | BPF_X:
+ if (insn_is_cast_user(insn)) {
+ move_reg(ctx, t1, src);
+ emit_zext_32(ctx, t1, true);
+ move_imm(ctx, dst, (ctx->user_vm_start >> 32) << 32, false);
+ emit_insn(ctx, beq, t1, LOONGARCH_GPR_ZERO, 1);
+ emit_insn(ctx, or, t1, dst, t1);
+ move_reg(ctx, dst, t1);
+ break;
+ }
switch (off) {
case 0:
move_reg(ctx, dst, src);
emit_zext_32(ctx, dst, is32);
break;
case 8:
- move_reg(ctx, t1, src);
- emit_insn(ctx, extwb, dst, t1);
+ emit_insn(ctx, extwb, dst, src);
emit_zext_32(ctx, dst, is32);
break;
case 16:
- move_reg(ctx, t1, src);
- emit_insn(ctx, extwh, dst, t1);
+ emit_insn(ctx, extwh, dst, src);
emit_zext_32(ctx, dst, is32);
break;
case 32:
@@ -897,21 +1147,43 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
/* function call */
case BPF_JMP | BPF_CALL:
- mark_call(ctx);
ret = bpf_jit_get_func_addr(ctx->prog, insn, extra_pass,
&func_addr, &func_addr_fixed);
if (ret < 0)
return ret;
+ if (insn->src_reg == BPF_PSEUDO_CALL) {
+ tcc_ptr_off = BPF_TAIL_CALL_CNT_PTR_STACK_OFF(ctx->stack_size);
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_SP, tcc_ptr_off);
+ }
+
+ if (insn->src_reg == BPF_PSEUDO_KFUNC_CALL) {
+ const struct btf_func_model *m;
+ int i;
+
+ m = bpf_jit_find_kfunc_model(ctx->prog, insn);
+ if (!m)
+ return -EINVAL;
+
+ for (i = 0; i < m->nr_args; i++) {
+ u8 reg = regmap[BPF_REG_1 + i];
+ bool sign = m->arg_flags[i] & BTF_FMODEL_SIGNED_ARG;
+
+ emit_abi_ext(ctx, reg, m->arg_size[i], sign);
+ }
+ }
+
move_addr(ctx, t1, func_addr);
emit_insn(ctx, jirl, LOONGARCH_GPR_RA, t1, 0);
- move_reg(ctx, regmap[BPF_REG_0], LOONGARCH_GPR_A0);
+
+ if (insn->src_reg != BPF_PSEUDO_CALL)
+ move_reg(ctx, regmap[BPF_REG_0], LOONGARCH_GPR_A0);
+
break;
/* tail call */
case BPF_JMP | BPF_TAIL_CALL:
- mark_tail_call(ctx);
- if (emit_bpf_tail_call(ctx) < 0)
+ if (emit_bpf_tail_call(ctx, i) < 0)
return -EINVAL;
break;
@@ -930,7 +1202,10 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
{
const u64 imm64 = (u64)(insn + 1)->imm << 32 | (u32)insn->imm;
- move_imm(ctx, dst, imm64, is32);
+ if (bpf_pseudo_func(insn))
+ move_addr(ctx, dst, imm64);
+ else
+ move_imm(ctx, dst, imm64, is32);
return 1;
}
@@ -950,8 +1225,19 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
case BPF_LDX | BPF_PROBE_MEMSX | BPF_B:
case BPF_LDX | BPF_PROBE_MEMSX | BPF_H:
case BPF_LDX | BPF_PROBE_MEMSX | BPF_W:
- sign_extend = BPF_MODE(insn->code) == BPF_MEMSX ||
- BPF_MODE(insn->code) == BPF_PROBE_MEMSX;
+ /* LDX | PROBE_MEM32: dst = *(unsigned size *)(src + REG_ARENA + off) */
+ case BPF_LDX | BPF_PROBE_MEM32 | BPF_B:
+ case BPF_LDX | BPF_PROBE_MEM32 | BPF_H:
+ case BPF_LDX | BPF_PROBE_MEM32 | BPF_W:
+ case BPF_LDX | BPF_PROBE_MEM32 | BPF_DW:
+ sign_extend = BPF_MODE(code) == BPF_MEMSX ||
+ BPF_MODE(code) == BPF_PROBE_MEMSX;
+
+ if (BPF_MODE(code) == BPF_PROBE_MEM32) {
+ emit_insn(ctx, addd, t2, src, REG_ARENA);
+ src = t2;
+ }
+
switch (BPF_SIZE(code)) {
case BPF_B:
if (is_signed_imm12(off)) {
@@ -1011,6 +1297,16 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
case BPF_ST | BPF_MEM | BPF_H:
case BPF_ST | BPF_MEM | BPF_W:
case BPF_ST | BPF_MEM | BPF_DW:
+ /* ST | PROBE_MEM32: *(size *)(dst + REG_ARENA + off) = imm */
+ case BPF_ST | BPF_PROBE_MEM32 | BPF_B:
+ case BPF_ST | BPF_PROBE_MEM32 | BPF_H:
+ case BPF_ST | BPF_PROBE_MEM32 | BPF_W:
+ case BPF_ST | BPF_PROBE_MEM32 | BPF_DW:
+ if (BPF_MODE(code) == BPF_PROBE_MEM32) {
+ emit_insn(ctx, addd, t3, dst, REG_ARENA);
+ dst = t3;
+ }
+
switch (BPF_SIZE(code)) {
case BPF_B:
move_imm(ctx, t1, imm, is32);
@@ -1053,6 +1349,10 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
}
break;
}
+
+ ret = add_exception_handler(insn, ctx, REG_DONT_CLEAR_MARKER);
+ if (ret)
+ return ret;
break;
/* *(size *)(dst + off) = src */
@@ -1060,6 +1360,16 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
case BPF_STX | BPF_MEM | BPF_H:
case BPF_STX | BPF_MEM | BPF_W:
case BPF_STX | BPF_MEM | BPF_DW:
+ /* STX | PROBE_MEM32: *(size *)(dst + REG_ARENA + off) = src */
+ case BPF_STX | BPF_PROBE_MEM32 | BPF_B:
+ case BPF_STX | BPF_PROBE_MEM32 | BPF_H:
+ case BPF_STX | BPF_PROBE_MEM32 | BPF_W:
+ case BPF_STX | BPF_PROBE_MEM32 | BPF_DW:
+ if (BPF_MODE(code) == BPF_PROBE_MEM32) {
+ emit_insn(ctx, addd, t2, dst, REG_ARENA);
+ dst = t2;
+ }
+
switch (BPF_SIZE(code)) {
case BPF_B:
if (is_signed_imm12(off)) {
@@ -1098,11 +1408,23 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
}
break;
}
+
+ ret = add_exception_handler(insn, ctx, REG_DONT_CLEAR_MARKER);
+ if (ret)
+ return ret;
break;
+ /* Atomics */
+ case BPF_STX | BPF_ATOMIC | BPF_B:
+ case BPF_STX | BPF_ATOMIC | BPF_H:
case BPF_STX | BPF_ATOMIC | BPF_W:
case BPF_STX | BPF_ATOMIC | BPF_DW:
- emit_atomic(insn, ctx);
+ if (!bpf_atomic_is_load_store(insn))
+ ret = emit_atomic_rmw(insn, ctx);
+ else
+ ret = emit_atomic_ld_st(insn, ctx);
+ if (ret)
+ return ret;
break;
/* Speculation barrier */
@@ -1172,56 +1494,708 @@ static int validate_code(struct jit_ctx *ctx)
return -1;
}
+ return 0;
+}
+
+static int validate_ctx(struct jit_ctx *ctx)
+{
+ if (validate_code(ctx))
+ return -1;
+
if (WARN_ON_ONCE(ctx->num_exentries != ctx->prog->aux->num_exentries))
return -1;
return 0;
}
-struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
+static int emit_jump_and_link(struct jit_ctx *ctx, u8 rd, u64 target)
+{
+ if (!target) {
+ pr_err("bpf_jit: jump target address is error\n");
+ return -EFAULT;
+ }
+
+ move_imm(ctx, LOONGARCH_GPR_T1, target, false);
+ emit_insn(ctx, jirl, rd, LOONGARCH_GPR_T1, 0);
+
+ return 0;
+}
+
+static int emit_jump_or_nops(void *target, void *ip, u32 *insns, bool is_call)
+{
+ int i;
+ struct jit_ctx ctx;
+
+ ctx.idx = 0;
+ ctx.image = (union loongarch_instruction *)insns;
+
+ if (!target) {
+ for (i = 0; i < LOONGARCH_LONG_JUMP_NINSNS; i++)
+ emit_insn((&ctx), nop);
+ return 0;
+ }
+
+ return emit_jump_and_link(&ctx, is_call ? LOONGARCH_GPR_RA : LOONGARCH_GPR_ZERO, (u64)target);
+}
+
+static int emit_call(struct jit_ctx *ctx, u64 addr)
+{
+ return emit_jump_and_link(ctx, LOONGARCH_GPR_RA, addr);
+}
+
+void *bpf_arch_text_copy(void *dst, void *src, size_t len)
+{
+ int ret;
+
+ cpus_read_lock();
+ mutex_lock(&text_mutex);
+ ret = larch_insn_text_copy(dst, src, len);
+ mutex_unlock(&text_mutex);
+ cpus_read_unlock();
+
+ return ret ? ERR_PTR(-EINVAL) : dst;
+}
+
+int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type old_t,
+ enum bpf_text_poke_type new_t, void *old_addr,
+ void *new_addr)
+{
+ int ret;
+ bool is_call;
+ unsigned long size = 0;
+ unsigned long offset = 0;
+ void *image = NULL;
+ char namebuf[KSYM_NAME_LEN];
+ u32 old_insns[LOONGARCH_LONG_JUMP_NINSNS] = {[0 ... 4] = INSN_NOP};
+ u32 new_insns[LOONGARCH_LONG_JUMP_NINSNS] = {[0 ... 4] = INSN_NOP};
+
+ /* Only poking bpf text is supported. Since kernel function entry
+ * is set up by ftrace, we rely on ftrace to poke kernel functions.
+ */
+ if (!bpf_address_lookup((unsigned long)ip, &size, &offset, namebuf))
+ return -ENOTSUPP;
+
+ image = ip - offset;
+
+ /* zero offset means we're poking bpf prog entry */
+ if (offset == 0) {
+ /* skip to the nop instruction in bpf prog entry:
+ * move t0, ra
+ * nop
+ */
+ ip = image + LOONGARCH_INSN_SIZE;
+ }
+
+ is_call = old_t == BPF_MOD_CALL;
+ ret = emit_jump_or_nops(old_addr, ip, old_insns, is_call);
+ if (ret)
+ return ret;
+
+ if (memcmp(ip, old_insns, LOONGARCH_LONG_JUMP_NBYTES))
+ return -EFAULT;
+
+ is_call = new_t == BPF_MOD_CALL;
+ ret = emit_jump_or_nops(new_addr, ip, new_insns, is_call);
+ if (ret)
+ return ret;
+
+ cpus_read_lock();
+ mutex_lock(&text_mutex);
+ if (memcmp(ip, new_insns, LOONGARCH_LONG_JUMP_NBYTES))
+ ret = larch_insn_text_copy(ip, new_insns, LOONGARCH_LONG_JUMP_NBYTES);
+ mutex_unlock(&text_mutex);
+ cpus_read_unlock();
+
+ return ret;
+}
+
+int bpf_arch_text_invalidate(void *dst, size_t len)
+{
+ int i;
+ int ret = 0;
+ u32 *inst;
+
+ inst = kvmalloc(len, GFP_KERNEL);
+ if (!inst)
+ return -ENOMEM;
+
+ for (i = 0; i < (len / sizeof(u32)); i++)
+ inst[i] = INSN_BREAK;
+
+ cpus_read_lock();
+ mutex_lock(&text_mutex);
+ if (larch_insn_text_copy(dst, inst, len))
+ ret = -EINVAL;
+ mutex_unlock(&text_mutex);
+ cpus_read_unlock();
+
+ kvfree(inst);
+
+ return ret;
+}
+
+static void store_args(struct jit_ctx *ctx, int nr_arg_slots, int args_off)
+{
+ int i;
+
+ for (i = 0; i < nr_arg_slots; i++) {
+ if (i < LOONGARCH_MAX_REG_ARGS)
+ emit_insn(ctx, std, LOONGARCH_GPR_A0 + i, LOONGARCH_GPR_FP, -args_off);
+ else {
+ /* Skip slots for T0 and FP of traced function */
+ emit_insn(ctx, ldd, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP,
+ 16 + (i - LOONGARCH_MAX_REG_ARGS) * 8);
+ emit_insn(ctx, std, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP, -args_off);
+ }
+ args_off -= 8;
+ }
+}
+
+static void restore_args(struct jit_ctx *ctx, int nr_reg_args, int args_off)
+{
+ int i;
+
+ for (i = 0; i < nr_reg_args; i++) {
+ emit_insn(ctx, ldd, LOONGARCH_GPR_A0 + i, LOONGARCH_GPR_FP, -args_off);
+ args_off -= 8;
+ }
+}
+
+static void restore_stk_args(struct jit_ctx *ctx, int nr_stk_args, int args_off, int stk_args_off)
+{
+ int i;
+
+ for (i = 0; i < nr_stk_args; i++) {
+ emit_insn(ctx, ldd, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP,
+ -(args_off - LOONGARCH_MAX_REG_ARGS * 8));
+ emit_insn(ctx, std, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP, -stk_args_off);
+ args_off -= 8;
+ stk_args_off -= 8;
+ }
+}
+
+static int invoke_bpf_prog(struct jit_ctx *ctx, struct bpf_tramp_link *l,
+ int args_off, int retval_off, int run_ctx_off, bool save_ret)
+{
+ int ret;
+ u32 *branch;
+ struct bpf_prog *p = l->link.prog;
+ int cookie_off = offsetof(struct bpf_tramp_run_ctx, bpf_cookie);
+
+ if (l->cookie)
+ emit_store_stack_imm64(ctx, LOONGARCH_GPR_T1,
+ -run_ctx_off + cookie_off, l->cookie);
+ else
+ emit_insn(ctx, std, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_FP, -run_ctx_off + cookie_off);
+
+ /* arg1: prog */
+ move_imm(ctx, LOONGARCH_GPR_A0, (const s64)p, false);
+ /* arg2: &run_ctx */
+ emit_insn(ctx, addid, LOONGARCH_GPR_A1, LOONGARCH_GPR_FP, -run_ctx_off);
+ ret = emit_call(ctx, (const u64)bpf_trampoline_enter(p));
+ if (ret)
+ return ret;
+
+ /* store prog start time */
+ move_reg(ctx, LOONGARCH_GPR_S1, LOONGARCH_GPR_A0);
+
+ /*
+ * if (__bpf_prog_enter(prog) == 0)
+ * goto skip_exec_of_prog;
+ */
+ branch = (u32 *)ctx->image + ctx->idx;
+ /* nop reserved for conditional jump */
+ emit_insn(ctx, nop);
+
+ /* arg1: &args_off */
+ emit_insn(ctx, addid, LOONGARCH_GPR_A0, LOONGARCH_GPR_FP, -args_off);
+ if (!p->jited)
+ move_imm(ctx, LOONGARCH_GPR_A1, (const s64)p->insnsi, false);
+ ret = emit_call(ctx, (const u64)p->bpf_func);
+ if (ret)
+ return ret;
+
+ if (save_ret) {
+ emit_insn(ctx, std, LOONGARCH_GPR_A0, LOONGARCH_GPR_FP, -retval_off);
+ emit_insn(ctx, std, regmap[BPF_REG_0], LOONGARCH_GPR_FP, -(retval_off - 8));
+ }
+
+ /* update branch with beqz */
+ if (ctx->image) {
+ int offset = (void *)(&ctx->image[ctx->idx]) - (void *)branch;
+ *branch = larch_insn_gen_beq(LOONGARCH_GPR_A0, LOONGARCH_GPR_ZERO, offset);
+ }
+
+ /* arg1: prog */
+ move_imm(ctx, LOONGARCH_GPR_A0, (const s64)p, false);
+ /* arg2: prog start time */
+ move_reg(ctx, LOONGARCH_GPR_A1, LOONGARCH_GPR_S1);
+ /* arg3: &run_ctx */
+ emit_insn(ctx, addid, LOONGARCH_GPR_A2, LOONGARCH_GPR_FP, -run_ctx_off);
+ ret = emit_call(ctx, (const u64)bpf_trampoline_exit(p));
+
+ return ret;
+}
+
+static int invoke_bpf(struct jit_ctx *ctx, struct bpf_tramp_links *tl,
+ int args_off, int retval_off, int run_ctx_off,
+ int func_meta_off, bool save_ret, u64 func_meta, int cookie_off)
+{
+ int i, cur_cookie = (cookie_off - args_off) / 8;
+
+ for (i = 0; i < tl->nr_links; i++) {
+ int err;
+
+ if (bpf_prog_calls_session_cookie(tl->links[i])) {
+ u64 meta = func_meta | ((u64)cur_cookie << BPF_TRAMP_COOKIE_INDEX_SHIFT);
+
+ emit_store_stack_imm64(ctx, LOONGARCH_GPR_T1, -func_meta_off, meta);
+ cur_cookie--;
+ }
+ err = invoke_bpf_prog(ctx, tl->links[i], args_off, retval_off, run_ctx_off, save_ret);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
+
+void *arch_alloc_bpf_trampoline(unsigned int size)
+{
+ return bpf_prog_pack_alloc(size, jit_fill_hole);
+}
+
+void arch_free_bpf_trampoline(void *image, unsigned int size)
+{
+ bpf_prog_pack_free(image, size);
+}
+
+int arch_protect_bpf_trampoline(void *image, unsigned int size)
+{
+ return 0;
+}
+
+/*
+ * Sign-extend the register if necessary
+ */
+static void sign_extend(struct jit_ctx *ctx, int rd, int rj, u8 size, bool sign)
{
- bool tmp_blinded = false, extra_pass = false;
- u8 *image_ptr;
+ /* ABI requires unsigned char/short to be zero-extended */
+ if (!sign && (size == 1 || size == 2)) {
+ if (rd != rj)
+ move_reg(ctx, rd, rj);
+ return;
+ }
+
+ switch (size) {
+ case 1:
+ emit_insn(ctx, extwb, rd, rj);
+ break;
+ case 2:
+ emit_insn(ctx, extwh, rd, rj);
+ break;
+ case 4:
+ emit_insn(ctx, addiw, rd, rj, 0);
+ break;
+ case 8:
+ if (rd != rj)
+ move_reg(ctx, rd, rj);
+ break;
+ default:
+ pr_warn("bpf_jit: invalid size %d for sign_extend\n", size);
+ }
+}
+
+static int __arch_prepare_bpf_trampoline(struct jit_ctx *ctx, struct bpf_tramp_image *im,
+ const struct btf_func_model *m, struct bpf_tramp_links *tlinks,
+ void *func_addr, u32 flags)
+{
+ int i, ret, save_ret;
+ int cookie_cnt, cookie_off;
+ int stack_size, args_off, stk_args_off, nr_arg_slots = 0;
+ int retval_off, func_meta_off, ip_off, run_ctx_off, sreg_off, tcc_ptr_off;
+ unsigned long long func_meta;
+ bool is_struct_ops = flags & BPF_TRAMP_F_INDIRECT;
+ void *orig_call = func_addr;
+ struct bpf_tramp_links *fentry = &tlinks[BPF_TRAMP_FENTRY];
+ struct bpf_tramp_links *fexit = &tlinks[BPF_TRAMP_FEXIT];
+ struct bpf_tramp_links *fmod_ret = &tlinks[BPF_TRAMP_MODIFY_RETURN];
+ u32 **branches = NULL;
+
+ /*
+ * FP + 8 [ RA to parent func ] return address to parent
+ * function
+ * FP + 0 [ FP of parent func ] frame pointer of parent
+ * function
+ * FP - 8 [ T0 to traced func ] return address of traced
+ * function
+ * FP - 16 [ FP of traced func ] frame pointer of traced
+ * function
+ *
+ * FP - retval_off [ return value ] BPF_TRAMP_F_CALL_ORIG or
+ * BPF_TRAMP_F_RET_FENTRY_RET
+ * [ arg regN ]
+ * [ ... ]
+ * FP - args_off [ arg reg1 ]
+ *
+ * FP - func_meta_off [ regs count, etc ]
+ *
+ * FP - ip_off [ traced func ] BPF_TRAMP_F_IP_ARG
+ *
+ * [ stack cookie N ]
+ * [ ... ]
+ * FP - cookie_off [ stack cookie 1 ]
+ *
+ * FP - run_ctx_off [ bpf_tramp_run_ctx ]
+ *
+ * FP - sreg_off [ callee saved reg ]
+ *
+ * FP - tcc_ptr_off [ tail_call_cnt_ptr ]
+ *
+ * [ stack_argN ]
+ * [ ... ]
+ * FP - stk_args_off [ stack_arg1 ] BPF_TRAMP_F_CALL_ORIG
+ */
+
+ if (m->nr_args > MAX_BPF_FUNC_ARGS)
+ return -ENOTSUPP;
+
+ /* Extra registers for struct arguments */
+ for (i = 0; i < m->nr_args; i++) {
+ /*
+ * The struct argument size is at most 16 bytes,
+ * enforced by the verifier. The struct argument
+ * may be passed in a pair of registers if its
+ * size is more than 8 bytes and no more than 16
+ * bytes.
+ */
+ nr_arg_slots += round_up(m->arg_size[i], 8) / 8;
+ }
+
+ if (flags & (BPF_TRAMP_F_ORIG_STACK | BPF_TRAMP_F_SHARE_IPMODIFY))
+ return -ENOTSUPP;
+
+ /* Room of trampoline frame to store return address and frame pointer */
+ stack_size = 16;
+
+ save_ret = flags & (BPF_TRAMP_F_CALL_ORIG | BPF_TRAMP_F_RET_FENTRY_RET);
+ if (save_ret)
+ stack_size += 16; /* Save BPF R0 and A0 */
+
+ retval_off = stack_size;
+
+ /* Room of trampoline frame to store args */
+ stack_size += nr_arg_slots * 8;
+ args_off = stack_size;
+
+ /* Room of function metadata, such as regs count */
+ stack_size += 8;
+ func_meta_off = stack_size;
+
+ /* Room of trampoline frame to store ip address */
+ if (flags & BPF_TRAMP_F_IP_ARG) {
+ stack_size += 8;
+ ip_off = stack_size;
+ }
+
+ cookie_cnt = bpf_fsession_cookie_cnt(tlinks);
+
+ /* Room for session cookies */
+ stack_size += cookie_cnt * 8;
+ cookie_off = stack_size;
+
+ /* Room of trampoline frame to store struct bpf_tramp_run_ctx */
+ stack_size += round_up(sizeof(struct bpf_tramp_run_ctx), 8);
+ run_ctx_off = stack_size;
+
+ stack_size += 8;
+ sreg_off = stack_size;
+
+ /* Room of trampoline frame to store tail_call_cnt_ptr */
+ if (flags & BPF_TRAMP_F_TAIL_CALL_CTX) {
+ stack_size += 8;
+ tcc_ptr_off = stack_size;
+ }
+
+ if ((flags & BPF_TRAMP_F_CALL_ORIG) && (nr_arg_slots - LOONGARCH_MAX_REG_ARGS > 0))
+ stack_size += (nr_arg_slots - LOONGARCH_MAX_REG_ARGS) * 8;
+
+ stack_size = round_up(stack_size, 16);
+
+ /* Room for args on stack must be at the top of stack */
+ stk_args_off = stack_size;
+
+ if (is_struct_ops) {
+ /*
+ * For the trampoline called directly, just handle
+ * the frame of trampoline.
+ */
+ emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, -stack_size);
+ emit_insn(ctx, std, LOONGARCH_GPR_RA, LOONGARCH_GPR_SP, stack_size - 8);
+ emit_insn(ctx, std, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_size - 16);
+ emit_insn(ctx, addid, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_size);
+ } else {
+ /*
+ * For the trampoline called from function entry,
+ * the frame of traced function and the frame of
+ * trampoline need to be considered.
+ */
+ /* RA and FP for parent function */
+ emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, -16);
+ emit_insn(ctx, std, LOONGARCH_GPR_RA, LOONGARCH_GPR_SP, 8);
+ emit_insn(ctx, std, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, 0);
+ emit_insn(ctx, addid, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, 16);
+
+ /* RA and FP for traced function */
+ emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, -stack_size);
+ emit_insn(ctx, std, LOONGARCH_GPR_T0, LOONGARCH_GPR_SP, stack_size - 8);
+ emit_insn(ctx, std, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_size - 16);
+ emit_insn(ctx, addid, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_size);
+ }
+
+ if (flags & BPF_TRAMP_F_TAIL_CALL_CTX)
+ emit_insn(ctx, std, REG_TCC, LOONGARCH_GPR_FP, -tcc_ptr_off);
+
+ /* callee saved register S1 to pass start time */
+ emit_insn(ctx, std, LOONGARCH_GPR_S1, LOONGARCH_GPR_FP, -sreg_off);
+
+ /* store ip address of the traced function */
+ if (flags & BPF_TRAMP_F_IP_ARG)
+ emit_store_stack_imm64(ctx, LOONGARCH_GPR_T1, -ip_off, (u64)func_addr);
+
+ /* store arg regs count */
+ func_meta = nr_arg_slots;
+ emit_store_stack_imm64(ctx, LOONGARCH_GPR_T1, -func_meta_off, func_meta);
+
+ store_args(ctx, nr_arg_slots, args_off);
+
+ if (bpf_fsession_cnt(tlinks)) {
+ /* clear all session cookies' value */
+ for (i = 0; i < cookie_cnt; i++)
+ emit_insn(ctx, std, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_FP, -cookie_off + 8 * i);
+
+ /* clear return value to make sure fentry always get 0 */
+ emit_insn(ctx, std, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_FP, -retval_off);
+ }
+
+ /* To traced function */
+ /* Ftrace jump skips 2 NOP instructions */
+ if (is_kernel_text((unsigned long)orig_call) ||
+ is_module_text_address((unsigned long)orig_call))
+ orig_call += LOONGARCH_FENTRY_NBYTES;
+ /* Direct jump skips 5 NOP instructions */
+ else if (is_bpf_text_address((unsigned long)orig_call))
+ orig_call += LOONGARCH_BPF_FENTRY_NBYTES;
+
+ if (flags & BPF_TRAMP_F_CALL_ORIG) {
+ move_addr(ctx, LOONGARCH_GPR_A0, (const u64)im);
+ ret = emit_call(ctx, (const u64)__bpf_tramp_enter);
+ if (ret)
+ return ret;
+ }
+
+ if (fentry->nr_links) {
+ ret = invoke_bpf(ctx, fentry, args_off, retval_off, run_ctx_off, func_meta_off,
+ flags & BPF_TRAMP_F_RET_FENTRY_RET, func_meta, cookie_off);
+ if (ret)
+ return ret;
+ }
+ if (fmod_ret->nr_links) {
+ branches = kcalloc(fmod_ret->nr_links, sizeof(u32 *), GFP_KERNEL);
+ if (!branches)
+ return -ENOMEM;
+
+ emit_insn(ctx, std, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_FP, -retval_off);
+ for (i = 0; i < fmod_ret->nr_links; i++) {
+ ret = invoke_bpf_prog(ctx, fmod_ret->links[i],
+ args_off, retval_off, run_ctx_off, true);
+ if (ret)
+ goto out;
+ emit_insn(ctx, ldd, LOONGARCH_GPR_T1, LOONGARCH_GPR_FP, -retval_off);
+ branches[i] = (u32 *)ctx->image + ctx->idx;
+ emit_insn(ctx, nop);
+ }
+ }
+
+ if (flags & BPF_TRAMP_F_CALL_ORIG) {
+ restore_args(ctx, min_t(int, nr_arg_slots, LOONGARCH_MAX_REG_ARGS), args_off);
+ restore_stk_args(ctx, nr_arg_slots - LOONGARCH_MAX_REG_ARGS, args_off, stk_args_off);
+
+ if (flags & BPF_TRAMP_F_TAIL_CALL_CTX)
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_FP, -tcc_ptr_off);
+
+ ret = emit_call(ctx, (const u64)orig_call);
+ if (ret)
+ goto out;
+ emit_insn(ctx, std, LOONGARCH_GPR_A0, LOONGARCH_GPR_FP, -retval_off);
+ emit_insn(ctx, std, regmap[BPF_REG_0], LOONGARCH_GPR_FP, -(retval_off - 8));
+ im->ip_after_call = ctx->ro_image + ctx->idx;
+ /* Reserve space for the move_imm + jirl instruction */
+ for (i = 0; i < LOONGARCH_LONG_JUMP_NINSNS; i++)
+ emit_insn(ctx, nop);
+ }
+
+ for (i = 0; ctx->image && i < fmod_ret->nr_links; i++) {
+ int offset = (void *)(&ctx->image[ctx->idx]) - (void *)branches[i];
+ *branches[i] = larch_insn_gen_bne(LOONGARCH_GPR_T1, LOONGARCH_GPR_ZERO, offset);
+ }
+
+ /* Set "is_return" flag for fsession */
+ func_meta |= (1ULL << BPF_TRAMP_IS_RETURN_SHIFT);
+ if (bpf_fsession_cnt(tlinks))
+ emit_store_stack_imm64(ctx, LOONGARCH_GPR_T1, -func_meta_off, func_meta);
+
+ if (fexit->nr_links) {
+ ret = invoke_bpf(ctx, fexit, args_off, retval_off, run_ctx_off,
+ func_meta_off, false, func_meta, cookie_off);
+ if (ret)
+ goto out;
+ }
+
+ if (flags & BPF_TRAMP_F_CALL_ORIG) {
+ im->ip_epilogue = ctx->ro_image + ctx->idx;
+ move_addr(ctx, LOONGARCH_GPR_A0, (const u64)im);
+ ret = emit_call(ctx, (const u64)__bpf_tramp_exit);
+ if (ret)
+ goto out;
+ }
+
+ if (flags & BPF_TRAMP_F_RESTORE_REGS)
+ restore_args(ctx, min_t(int, nr_arg_slots, LOONGARCH_MAX_REG_ARGS), args_off);
+
+ if (save_ret) {
+ emit_insn(ctx, ldd, regmap[BPF_REG_0], LOONGARCH_GPR_FP, -(retval_off - 8));
+ if (is_struct_ops)
+ sign_extend(ctx, LOONGARCH_GPR_A0, regmap[BPF_REG_0],
+ m->ret_size, m->ret_flags & BTF_FMODEL_SIGNED_ARG);
+ else
+ emit_insn(ctx, ldd, LOONGARCH_GPR_A0, LOONGARCH_GPR_FP, -retval_off);
+ }
+
+ emit_insn(ctx, ldd, LOONGARCH_GPR_S1, LOONGARCH_GPR_FP, -sreg_off);
+
+ if (flags & BPF_TRAMP_F_TAIL_CALL_CTX)
+ emit_insn(ctx, ldd, REG_TCC, LOONGARCH_GPR_FP, -tcc_ptr_off);
+
+ if (is_struct_ops) {
+ /* trampoline called directly */
+ emit_insn(ctx, ldd, LOONGARCH_GPR_RA, LOONGARCH_GPR_SP, stack_size - 8);
+ emit_insn(ctx, ldd, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_size - 16);
+ emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, stack_size);
+
+ emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_RA, 0);
+ } else {
+ /* trampoline called from function entry */
+ emit_insn(ctx, ldd, LOONGARCH_GPR_T0, LOONGARCH_GPR_SP, stack_size - 8);
+ emit_insn(ctx, ldd, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, stack_size - 16);
+ emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, stack_size);
+
+ emit_insn(ctx, ldd, LOONGARCH_GPR_RA, LOONGARCH_GPR_SP, 8);
+ emit_insn(ctx, ldd, LOONGARCH_GPR_FP, LOONGARCH_GPR_SP, 0);
+ emit_insn(ctx, addid, LOONGARCH_GPR_SP, LOONGARCH_GPR_SP, 16);
+
+ if (flags & BPF_TRAMP_F_SKIP_FRAME) {
+ /* return to parent function */
+ move_reg(ctx, LOONGARCH_GPR_RA, LOONGARCH_GPR_T0);
+ emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_T0, 0);
+ } else {
+ /* return to traced function */
+ move_reg(ctx, LOONGARCH_GPR_T1, LOONGARCH_GPR_RA);
+ move_reg(ctx, LOONGARCH_GPR_RA, LOONGARCH_GPR_T0);
+ emit_insn(ctx, jirl, LOONGARCH_GPR_ZERO, LOONGARCH_GPR_T1, 0);
+ }
+ }
+
+ ret = ctx->idx;
+out:
+ kfree(branches);
+
+ return ret;
+}
+
+int arch_prepare_bpf_trampoline(struct bpf_tramp_image *im, void *ro_image,
+ void *ro_image_end, const struct btf_func_model *m,
+ u32 flags, struct bpf_tramp_links *tlinks, void *func_addr)
+{
+ int ret, size;
+ void *image, *tmp;
+ struct jit_ctx ctx;
+
+ size = ro_image_end - ro_image;
+ image = kvmalloc(size, GFP_KERNEL);
+ if (!image)
+ return -ENOMEM;
+
+ ctx.image = (union loongarch_instruction *)image;
+ ctx.ro_image = (union loongarch_instruction *)ro_image;
+ ctx.idx = 0;
+
+ jit_fill_hole(image, (unsigned int)(ro_image_end - ro_image));
+ ret = __arch_prepare_bpf_trampoline(&ctx, im, m, tlinks, func_addr, flags);
+ if (ret < 0)
+ goto out;
+
+ if (validate_code(&ctx) < 0) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ tmp = bpf_arch_text_copy(ro_image, image, size);
+ if (IS_ERR(tmp)) {
+ ret = PTR_ERR(tmp);
+ goto out;
+ }
+
+out:
+ kvfree(image);
+ return ret < 0 ? ret : size;
+}
+
+int arch_bpf_trampoline_size(const struct btf_func_model *m, u32 flags,
+ struct bpf_tramp_links *tlinks, void *func_addr)
+{
+ int ret;
+ struct jit_ctx ctx;
+ struct bpf_tramp_image im;
+
+ ctx.image = NULL;
+ ctx.idx = 0;
+
+ ret = __arch_prepare_bpf_trampoline(&ctx, &im, m, tlinks, func_addr, flags);
+
+ return ret < 0 ? ret : ret * LOONGARCH_INSN_SIZE;
+}
+
+struct bpf_prog *bpf_int_jit_compile(struct bpf_verifier_env *env, struct bpf_prog *prog)
+{
+ bool extra_pass = false;
+ u8 *image_ptr, *ro_image_ptr;
int image_size, prog_size, extable_size;
struct jit_ctx ctx;
struct jit_data *jit_data;
struct bpf_binary_header *header;
- struct bpf_prog *tmp, *orig_prog = prog;
+ struct bpf_binary_header *ro_header;
/*
* If BPF JIT was not enabled then we must fall back to
* the interpreter.
*/
if (!prog->jit_requested)
- return orig_prog;
-
- tmp = bpf_jit_blind_constants(prog);
- /*
- * If blinding was requested and we failed during blinding,
- * we must fall back to the interpreter. Otherwise, we save
- * the new JITed code.
- */
- if (IS_ERR(tmp))
- return orig_prog;
-
- if (tmp != prog) {
- tmp_blinded = true;
- prog = tmp;
- }
+ return prog;
jit_data = prog->aux->jit_data;
if (!jit_data) {
- jit_data = kzalloc(sizeof(*jit_data), GFP_KERNEL);
- if (!jit_data) {
- prog = orig_prog;
- goto out;
- }
+ jit_data = kzalloc_obj(*jit_data);
+ if (!jit_data)
+ return prog;
prog->aux->jit_data = jit_data;
}
if (jit_data->ctx.offset) {
ctx = jit_data->ctx;
- image_ptr = jit_data->image;
+ ro_header = jit_data->ro_header;
+ ro_image_ptr = (void *)ctx.ro_image;
header = jit_data->header;
+ image_ptr = (void *)header + ((void *)ro_image_ptr - (void *)ro_header);
extra_pass = true;
prog_size = sizeof(u32) * ctx.idx;
goto skip_init_ctx;
@@ -1229,19 +2203,17 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
memset(&ctx, 0, sizeof(ctx));
ctx.prog = prog;
+ ctx.arena_vm_start = bpf_arena_get_kern_vm_start(prog->aux->arena);
+ ctx.user_vm_start = bpf_arena_get_user_vm_start(prog->aux->arena);
ctx.offset = kvcalloc(prog->len + 1, sizeof(u32), GFP_KERNEL);
- if (ctx.offset == NULL) {
- prog = orig_prog;
+ if (ctx.offset == NULL)
goto out_offset;
- }
/* 1. Initial fake pass to compute ctx->idx and set ctx->flags */
build_prologue(&ctx);
- if (build_body(&ctx, extra_pass)) {
- prog = orig_prog;
+ if (build_body(&ctx, extra_pass))
goto out_offset;
- }
ctx.epilogue_offset = ctx.idx;
build_epilogue(&ctx);
@@ -1255,66 +2227,67 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
prog_size = sizeof(u32) * ctx.idx;
image_size = prog_size + extable_size;
/* Now we know the size of the structure to make */
- header = bpf_jit_binary_alloc(image_size, &image_ptr,
- sizeof(u32), jit_fill_hole);
- if (header == NULL) {
- prog = orig_prog;
+ ro_header = bpf_jit_binary_pack_alloc(image_size, &ro_image_ptr, sizeof(u32),
+ &header, &image_ptr, jit_fill_hole);
+ if (!ro_header)
goto out_offset;
- }
/* 2. Now, the actual pass to generate final JIT code */
+ /*
+ * Use the image (RW) for writing the JITed instructions. But also save
+ * the ro_image (RX) for calculating the offsets in the image. The RW
+ * image will be later copied to the RX image from where the program will
+ * run. The bpf_jit_binary_pack_finalize() will do this copy in the final
+ * step.
+ */
ctx.image = (union loongarch_instruction *)image_ptr;
+ ctx.ro_image = (union loongarch_instruction *)ro_image_ptr;
if (extable_size)
- prog->aux->extable = (void *)image_ptr + prog_size;
+ prog->aux->extable = (void *)ro_image_ptr + prog_size;
skip_init_ctx:
ctx.idx = 0;
ctx.num_exentries = 0;
build_prologue(&ctx);
- if (build_body(&ctx, extra_pass)) {
- bpf_jit_binary_free(header);
- prog = orig_prog;
- goto out_offset;
- }
+ if (build_body(&ctx, extra_pass))
+ goto out_free;
build_epilogue(&ctx);
/* 3. Extra pass to validate JITed code */
- if (validate_code(&ctx)) {
- bpf_jit_binary_free(header);
- prog = orig_prog;
- goto out_offset;
- }
+ if (validate_ctx(&ctx))
+ goto out_free;
/* And we're done */
if (bpf_jit_enable > 1)
bpf_jit_dump(prog->len, prog_size, 2, ctx.image);
- /* Update the icache */
- flush_icache_range((unsigned long)header, (unsigned long)(ctx.image + ctx.idx));
-
if (!prog->is_func || extra_pass) {
- int err;
-
if (extra_pass && ctx.idx != jit_data->ctx.idx) {
pr_err_once("multi-func JIT bug %d != %d\n",
ctx.idx, jit_data->ctx.idx);
goto out_free;
}
- err = bpf_jit_binary_lock_ro(header);
- if (err) {
- pr_err_once("bpf_jit_binary_lock_ro() returned %d\n",
- err);
+ if (WARN_ON(bpf_jit_binary_pack_finalize(ro_header, header))) {
+ /* ro_header and header have been freed */
+ ro_header = NULL;
+ header = NULL;
goto out_free;
}
+ /*
+ * The instructions have now been copied to the ROX region from
+ * where they will execute. Now the data cache has to be cleaned
+ * to the PoU and the I-cache has to be invalidated for the VAs.
+ */
+ bpf_flush_icache(ro_header, ctx.ro_image + ctx.idx);
} else {
jit_data->ctx = ctx;
- jit_data->image = image_ptr;
jit_data->header = header;
+ jit_data->ro_header = ro_header;
}
prog->jited = 1;
prog->jited_len = prog_size;
- prog->bpf_func = (void *)ctx.image;
+ prog->bpf_func = (void *)ctx.ro_image;
if (!prog->is_func || extra_pass) {
int i;
@@ -1330,22 +2303,65 @@ out_offset:
prog->aux->jit_data = NULL;
}
-out:
- if (tmp_blinded)
- bpf_jit_prog_release_other(prog, prog == orig_prog ? tmp : orig_prog);
-
- out_offset = -1;
-
return prog;
out_free:
- bpf_jit_binary_free(header);
- prog->bpf_func = NULL;
- prog->jited = 0;
- prog->jited_len = 0;
+ if (extra_pass) {
+ prog->bpf_func = NULL;
+ prog->jited = 0;
+ prog->jited_len = 0;
+ }
+
+ if (header) {
+ bpf_arch_text_copy(&ro_header->size, &header->size, sizeof(header->size));
+ bpf_jit_binary_pack_free(ro_header, header);
+ }
goto out_offset;
}
+void bpf_jit_free(struct bpf_prog *prog)
+{
+ if (prog->jited) {
+ struct jit_data *jit_data = prog->aux->jit_data;
+ struct bpf_binary_header *hdr;
+
+ /*
+ * If we fail the final pass of JIT (from jit_subprogs), the
+ * program may not be finalized yet. Call finalize here before
+ * freeing it.
+ */
+ if (jit_data) {
+ bpf_jit_binary_pack_finalize(jit_data->ro_header, jit_data->header);
+ kfree(jit_data);
+ }
+ hdr = bpf_jit_binary_pack_hdr(prog);
+ bpf_jit_binary_pack_free(hdr, NULL);
+ WARN_ON_ONCE(!bpf_prog_kallsyms_verify_off(prog));
+ }
+
+ bpf_prog_unlock_free(prog);
+}
+
+bool bpf_jit_bypass_spec_v1(void)
+{
+ return true;
+}
+
+bool bpf_jit_bypass_spec_v4(void)
+{
+ return true;
+}
+
+bool bpf_jit_supports_arena(void)
+{
+ return true;
+}
+
+bool bpf_jit_supports_fsession(void)
+{
+ return true;
+}
+
/* Indicate the JIT backend supports mixing bpf2bpf and tailcalls. */
bool bpf_jit_supports_subprog_tailcalls(void)
{
diff --git a/arch/loongarch/net/bpf_jit.h b/arch/loongarch/net/bpf_jit.h
index 68586338ecf8..a8e29be35fa8 100644
--- a/arch/loongarch/net/bpf_jit.h
+++ b/arch/loongarch/net/bpf_jit.h
@@ -18,15 +18,23 @@ struct jit_ctx {
u32 *offset;
int num_exentries;
union loongarch_instruction *image;
+ union loongarch_instruction *ro_image;
u32 stack_size;
+ u64 arena_vm_start;
+ u64 user_vm_start;
};
struct jit_data {
struct bpf_binary_header *header;
- u8 *image;
+ struct bpf_binary_header *ro_header;
struct jit_ctx ctx;
};
+static inline void emit_nop(union loongarch_instruction *insn)
+{
+ insn->word = INSN_NOP;
+}
+
#define emit_insn(ctx, func, ...) \
do { \
if (ctx->image != NULL) { \
@@ -82,6 +90,32 @@ static inline void emit_sext_32(struct jit_ctx *ctx, enum loongarch_gpr reg, boo
emit_insn(ctx, addiw, reg, reg, 0);
}
+/* Emit proper extension according to ABI requirements.
+ * Note that it requires a value of size `size` already resides in register `reg`.
+ */
+static inline void emit_abi_ext(struct jit_ctx *ctx, int reg, u8 size, bool sign)
+{
+ /* ABI requires unsigned char/short to be zero-extended */
+ if (!sign && (size == 1 || size == 2))
+ return;
+
+ switch (size) {
+ case 1:
+ emit_insn(ctx, extwb, reg, reg);
+ break;
+ case 2:
+ emit_insn(ctx, extwh, reg, reg);
+ break;
+ case 4:
+ emit_insn(ctx, addiw, reg, reg, 0);
+ break;
+ case 8:
+ break;
+ default:
+ pr_warn("bpf_jit: invalid size %d for extension\n", size);
+ }
+}
+
static inline void move_addr(struct jit_ctx *ctx, enum loongarch_gpr rd, u64 addr)
{
u64 imm_11_0, imm_31_12, imm_51_32, imm_63_52;
@@ -303,3 +337,8 @@ static inline int emit_tailcall_jmp(struct jit_ctx *ctx, u8 cond, enum loongarch
return -EINVAL;
}
+
+static inline void bpf_flush_icache(void *start, void *end)
+{
+ flush_icache_range((unsigned long)start, (unsigned long)end);
+}