+++ /dev/null
-/*
- * Just-In-Time compiler for BPF filters on MIPS
- *
- * Copyright (c) 2014 Imagination Technologies Ltd.
- * Author: Markos Chandras <markos.chandras@imgtec.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; version 2 of the License.
- */
-
-#include <linux/bitops.h>
-#include <linux/compiler.h>
-#include <linux/errno.h>
-#include <linux/filter.h>
-#include <linux/if_vlan.h>
-#include <linux/moduleloader.h>
-#include <linux/netdevice.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <linux/types.h>
-#include <asm/asm.h>
-#include <asm/bitops.h>
-#include <asm/cacheflush.h>
-#include <asm/cpu-features.h>
-#include <asm/uasm.h>
-
-#include "bpf_jit.h"
-
-/* ABI
- * r_skb_hl SKB header length
- * r_data SKB data pointer
- * r_off Offset
- * r_A BPF register A
- * r_X BPF register X
- * r_skb *skb
- * r_M *scratch memory
- * r_skb_len SKB length
- *
- * On entry (*bpf_func)(*skb, *filter)
- * a0 = MIPS_R_A0 = skb;
- * a1 = MIPS_R_A1 = filter;
- *
- * Stack
- * ...
- * M[15]
- * M[14]
- * M[13]
- * ...
- * M[0] <-- r_M
- * saved reg k-1
- * saved reg k-2
- * ...
- * saved reg 0 <-- r_sp
- * <no argument area>
- *
- * Packet layout
- *
- * <--------------------- len ------------------------>
- * <--skb-len(r_skb_hl)-->< ----- skb->data_len ------>
- * ----------------------------------------------------
- * | skb->data |
- * ----------------------------------------------------
- */
-
-#define ptr typeof(unsigned long)
-
-#define SCRATCH_OFF(k) (4 * (k))
-
-/* JIT flags */
-#define SEEN_CALL (1 << BPF_MEMWORDS)
-#define SEEN_SREG_SFT (BPF_MEMWORDS + 1)
-#define SEEN_SREG_BASE (1 << SEEN_SREG_SFT)
-#define SEEN_SREG(x) (SEEN_SREG_BASE << (x))
-#define SEEN_OFF SEEN_SREG(2)
-#define SEEN_A SEEN_SREG(3)
-#define SEEN_X SEEN_SREG(4)
-#define SEEN_SKB SEEN_SREG(5)
-#define SEEN_MEM SEEN_SREG(6)
-/* SEEN_SK_DATA also implies skb_hl an skb_len */
-#define SEEN_SKB_DATA (SEEN_SREG(7) | SEEN_SREG(1) | SEEN_SREG(0))
-
-/* Arguments used by JIT */
-#define ARGS_USED_BY_JIT 2 /* only applicable to 64-bit */
-
-#define SBIT(x) (1 << (x)) /* Signed version of BIT() */
-
-/**
- * struct jit_ctx - JIT context
- * @skf: The sk_filter
- * @prologue_bytes: Number of bytes for prologue
- * @idx: Instruction index
- * @flags: JIT flags
- * @offsets: Instruction offsets
- * @target: Memory location for the compiled filter
- */
-struct jit_ctx {
- const struct bpf_prog *skf;
- unsigned int prologue_bytes;
- u32 idx;
- u32 flags;
- u32 *offsets;
- u32 *target;
-};
-
-
-static inline int optimize_div(u32 *k)
-{
- /* power of 2 divides can be implemented with right shift */
- if (!(*k & (*k-1))) {
- *k = ilog2(*k);
- return 1;
- }
-
- return 0;
-}
-
-static inline void emit_jit_reg_move(ptr dst, ptr src, struct jit_ctx *ctx);
-
-/* Simply emit the instruction if the JIT memory space has been allocated */
-#define emit_instr(ctx, func, ...) \
-do { \
- if ((ctx)->target != NULL) { \
- u32 *p = &(ctx)->target[ctx->idx]; \
- uasm_i_##func(&p, ##__VA_ARGS__); \
- } \
- (ctx)->idx++; \
-} while (0)
-
-/*
- * Similar to emit_instr but it must be used when we need to emit
- * 32-bit or 64-bit instructions
- */
-#define emit_long_instr(ctx, func, ...) \
-do { \
- if ((ctx)->target != NULL) { \
- u32 *p = &(ctx)->target[ctx->idx]; \
- UASM_i_##func(&p, ##__VA_ARGS__); \
- } \
- (ctx)->idx++; \
-} while (0)
-
-/* Determine if immediate is within the 16-bit signed range */
-static inline bool is_range16(s32 imm)
-{
- return !(imm >= SBIT(15) || imm < -SBIT(15));
-}
-
-static inline void emit_addu(unsigned int dst, unsigned int src1,
- unsigned int src2, struct jit_ctx *ctx)
-{
- emit_instr(ctx, addu, dst, src1, src2);
-}
-
-static inline void emit_nop(struct jit_ctx *ctx)
-{
- emit_instr(ctx, nop);
-}
-
-/* Load a u32 immediate to a register */
-static inline void emit_load_imm(unsigned int dst, u32 imm, struct jit_ctx *ctx)
-{
- if (ctx->target != NULL) {
- /* addiu can only handle s16 */
- if (!is_range16(imm)) {
- u32 *p = &ctx->target[ctx->idx];
- uasm_i_lui(&p, r_tmp_imm, (s32)imm >> 16);
- p = &ctx->target[ctx->idx + 1];
- uasm_i_ori(&p, dst, r_tmp_imm, imm & 0xffff);
- } else {
- u32 *p = &ctx->target[ctx->idx];
- uasm_i_addiu(&p, dst, r_zero, imm);
- }
- }
- ctx->idx++;
-
- if (!is_range16(imm))
- ctx->idx++;
-}
-
-static inline void emit_or(unsigned int dst, unsigned int src1,
- unsigned int src2, struct jit_ctx *ctx)
-{
- emit_instr(ctx, or, dst, src1, src2);
-}
-
-static inline void emit_ori(unsigned int dst, unsigned src, u32 imm,
- struct jit_ctx *ctx)
-{
- if (imm >= BIT(16)) {
- emit_load_imm(r_tmp, imm, ctx);
- emit_or(dst, src, r_tmp, ctx);
- } else {
- emit_instr(ctx, ori, dst, src, imm);
- }
-}
-
-static inline void emit_daddiu(unsigned int dst, unsigned int src,
- int imm, struct jit_ctx *ctx)
-{
- /*
- * Only used for stack, so the imm is relatively small
- * and it fits in 15-bits
- */
- emit_instr(ctx, daddiu, dst, src, imm);
-}
-
-static inline void emit_addiu(unsigned int dst, unsigned int src,
- u32 imm, struct jit_ctx *ctx)
-{
- if (!is_range16(imm)) {
- emit_load_imm(r_tmp, imm, ctx);
- emit_addu(dst, r_tmp, src, ctx);
- } else {
- emit_instr(ctx, addiu, dst, src, imm);
- }
-}
-
-static inline void emit_and(unsigned int dst, unsigned int src1,
- unsigned int src2, struct jit_ctx *ctx)
-{
- emit_instr(ctx, and, dst, src1, src2);
-}
-
-static inline void emit_andi(unsigned int dst, unsigned int src,
- u32 imm, struct jit_ctx *ctx)
-{
- /* If imm does not fit in u16 then load it to register */
- if (imm >= BIT(16)) {
- emit_load_imm(r_tmp, imm, ctx);
- emit_and(dst, src, r_tmp, ctx);
- } else {
- emit_instr(ctx, andi, dst, src, imm);
- }
-}
-
-static inline void emit_xor(unsigned int dst, unsigned int src1,
- unsigned int src2, struct jit_ctx *ctx)
-{
- emit_instr(ctx, xor, dst, src1, src2);
-}
-
-static inline void emit_xori(ptr dst, ptr src, u32 imm, struct jit_ctx *ctx)
-{
- /* If imm does not fit in u16 then load it to register */
- if (imm >= BIT(16)) {
- emit_load_imm(r_tmp, imm, ctx);
- emit_xor(dst, src, r_tmp, ctx);
- } else {
- emit_instr(ctx, xori, dst, src, imm);
- }
-}
-
-static inline void emit_stack_offset(int offset, struct jit_ctx *ctx)
-{
- emit_long_instr(ctx, ADDIU, r_sp, r_sp, offset);
-}
-
-static inline void emit_subu(unsigned int dst, unsigned int src1,
- unsigned int src2, struct jit_ctx *ctx)
-{
- emit_instr(ctx, subu, dst, src1, src2);
-}
-
-static inline void emit_neg(unsigned int reg, struct jit_ctx *ctx)
-{
- emit_subu(reg, r_zero, reg, ctx);
-}
-
-static inline void emit_sllv(unsigned int dst, unsigned int src,
- unsigned int sa, struct jit_ctx *ctx)
-{
- emit_instr(ctx, sllv, dst, src, sa);
-}
-
-static inline void emit_sll(unsigned int dst, unsigned int src,
- unsigned int sa, struct jit_ctx *ctx)
-{
- /* sa is 5-bits long */
- if (sa >= BIT(5))
- /* Shifting >= 32 results in zero */
- emit_jit_reg_move(dst, r_zero, ctx);
- else
- emit_instr(ctx, sll, dst, src, sa);
-}
-
-static inline void emit_srlv(unsigned int dst, unsigned int src,
- unsigned int sa, struct jit_ctx *ctx)
-{
- emit_instr(ctx, srlv, dst, src, sa);
-}
-
-static inline void emit_srl(unsigned int dst, unsigned int src,
- unsigned int sa, struct jit_ctx *ctx)
-{
- /* sa is 5-bits long */
- if (sa >= BIT(5))
- /* Shifting >= 32 results in zero */
- emit_jit_reg_move(dst, r_zero, ctx);
- else
- emit_instr(ctx, srl, dst, src, sa);
-}
-
-static inline void emit_slt(unsigned int dst, unsigned int src1,
- unsigned int src2, struct jit_ctx *ctx)
-{
- emit_instr(ctx, slt, dst, src1, src2);
-}
-
-static inline void emit_sltu(unsigned int dst, unsigned int src1,
- unsigned int src2, struct jit_ctx *ctx)
-{
- emit_instr(ctx, sltu, dst, src1, src2);
-}
-
-static inline void emit_sltiu(unsigned dst, unsigned int src,
- unsigned int imm, struct jit_ctx *ctx)
-{
- /* 16 bit immediate */
- if (!is_range16((s32)imm)) {
- emit_load_imm(r_tmp, imm, ctx);
- emit_sltu(dst, src, r_tmp, ctx);
- } else {
- emit_instr(ctx, sltiu, dst, src, imm);
- }
-
-}
-
-/* Store register on the stack */
-static inline void emit_store_stack_reg(ptr reg, ptr base,
- unsigned int offset,
- struct jit_ctx *ctx)
-{
- emit_long_instr(ctx, SW, reg, offset, base);
-}
-
-static inline void emit_store(ptr reg, ptr base, unsigned int offset,
- struct jit_ctx *ctx)
-{
- emit_instr(ctx, sw, reg, offset, base);
-}
-
-static inline void emit_load_stack_reg(ptr reg, ptr base,
- unsigned int offset,
- struct jit_ctx *ctx)
-{
- emit_long_instr(ctx, LW, reg, offset, base);
-}
-
-static inline void emit_load(unsigned int reg, unsigned int base,
- unsigned int offset, struct jit_ctx *ctx)
-{
- emit_instr(ctx, lw, reg, offset, base);
-}
-
-static inline void emit_load_byte(unsigned int reg, unsigned int base,
- unsigned int offset, struct jit_ctx *ctx)
-{
- emit_instr(ctx, lb, reg, offset, base);
-}
-
-static inline void emit_half_load(unsigned int reg, unsigned int base,
- unsigned int offset, struct jit_ctx *ctx)
-{
- emit_instr(ctx, lh, reg, offset, base);
-}
-
-static inline void emit_half_load_unsigned(unsigned int reg, unsigned int base,
- unsigned int offset, struct jit_ctx *ctx)
-{
- emit_instr(ctx, lhu, reg, offset, base);
-}
-
-static inline void emit_mul(unsigned int dst, unsigned int src1,
- unsigned int src2, struct jit_ctx *ctx)
-{
- emit_instr(ctx, mul, dst, src1, src2);
-}
-
-static inline void emit_div(unsigned int dst, unsigned int src,
- struct jit_ctx *ctx)
-{
- if (ctx->target != NULL) {
- u32 *p = &ctx->target[ctx->idx];
- uasm_i_divu(&p, dst, src);
- p = &ctx->target[ctx->idx + 1];
- uasm_i_mflo(&p, dst);
- }
- ctx->idx += 2; /* 2 insts */
-}
-
-static inline void emit_mod(unsigned int dst, unsigned int src,
- struct jit_ctx *ctx)
-{
- if (ctx->target != NULL) {
- u32 *p = &ctx->target[ctx->idx];
- uasm_i_divu(&p, dst, src);
- p = &ctx->target[ctx->idx + 1];
- uasm_i_mfhi(&p, dst);
- }
- ctx->idx += 2; /* 2 insts */
-}
-
-static inline void emit_dsll(unsigned int dst, unsigned int src,
- unsigned int sa, struct jit_ctx *ctx)
-{
- emit_instr(ctx, dsll, dst, src, sa);
-}
-
-static inline void emit_dsrl32(unsigned int dst, unsigned int src,
- unsigned int sa, struct jit_ctx *ctx)
-{
- emit_instr(ctx, dsrl32, dst, src, sa);
-}
-
-static inline void emit_wsbh(unsigned int dst, unsigned int src,
- struct jit_ctx *ctx)
-{
- emit_instr(ctx, wsbh, dst, src);
-}
-
-/* load pointer to register */
-static inline void emit_load_ptr(unsigned int dst, unsigned int src,
- int imm, struct jit_ctx *ctx)
-{
- /* src contains the base addr of the 32/64-pointer */
- emit_long_instr(ctx, LW, dst, imm, src);
-}
-
-/* load a function pointer to register */
-static inline void emit_load_func(unsigned int reg, ptr imm,
- struct jit_ctx *ctx)
-{
- if (IS_ENABLED(CONFIG_64BIT)) {
- /* At this point imm is always 64-bit */
- emit_load_imm(r_tmp, (u64)imm >> 32, ctx);
- emit_dsll(r_tmp_imm, r_tmp, 16, ctx); /* left shift by 16 */
- emit_ori(r_tmp, r_tmp_imm, (imm >> 16) & 0xffff, ctx);
- emit_dsll(r_tmp_imm, r_tmp, 16, ctx); /* left shift by 16 */
- emit_ori(reg, r_tmp_imm, imm & 0xffff, ctx);
- } else {
- emit_load_imm(reg, imm, ctx);
- }
-}
-
-/* Move to real MIPS register */
-static inline void emit_reg_move(ptr dst, ptr src, struct jit_ctx *ctx)
-{
- emit_long_instr(ctx, ADDU, dst, src, r_zero);
-}
-
-/* Move to JIT (32-bit) register */
-static inline void emit_jit_reg_move(ptr dst, ptr src, struct jit_ctx *ctx)
-{
- emit_addu(dst, src, r_zero, ctx);
-}
-
-/* Compute the immediate value for PC-relative branches. */
-static inline u32 b_imm(unsigned int tgt, struct jit_ctx *ctx)
-{
- if (ctx->target == NULL)
- return 0;
-
- /*
- * We want a pc-relative branch. We only do forward branches
- * so tgt is always after pc. tgt is the instruction offset
- * we want to jump to.
-
- * Branch on MIPS:
- * I: target_offset <- sign_extend(offset)
- * I+1: PC += target_offset (delay slot)
- *
- * ctx->idx currently points to the branch instruction
- * but the offset is added to the delay slot so we need
- * to subtract 4.
- */
- return ctx->offsets[tgt] -
- (ctx->idx * 4 - ctx->prologue_bytes) - 4;
-}
-
-static inline void emit_bcond(int cond, unsigned int reg1, unsigned int reg2,
- unsigned int imm, struct jit_ctx *ctx)
-{
- if (ctx->target != NULL) {
- u32 *p = &ctx->target[ctx->idx];
-
- switch (cond) {
- case MIPS_COND_EQ:
- uasm_i_beq(&p, reg1, reg2, imm);
- break;
- case MIPS_COND_NE:
- uasm_i_bne(&p, reg1, reg2, imm);
- break;
- case MIPS_COND_ALL:
- uasm_i_b(&p, imm);
- break;
- default:
- pr_warn("%s: Unhandled branch conditional: %d\n",
- __func__, cond);
- }
- }
- ctx->idx++;
-}
-
-static inline void emit_b(unsigned int imm, struct jit_ctx *ctx)
-{
- emit_bcond(MIPS_COND_ALL, r_zero, r_zero, imm, ctx);
-}
-
-static inline void emit_jalr(unsigned int link, unsigned int reg,
- struct jit_ctx *ctx)
-{
- emit_instr(ctx, jalr, link, reg);
-}
-
-static inline void emit_jr(unsigned int reg, struct jit_ctx *ctx)
-{
- emit_instr(ctx, jr, reg);
-}
-
-static inline u16 align_sp(unsigned int num)
-{
- /* Double word alignment for 32-bit, quadword for 64-bit */
- unsigned int align = IS_ENABLED(CONFIG_64BIT) ? 16 : 8;
- num = (num + (align - 1)) & -align;
- return num;
-}
-
-static void save_bpf_jit_regs(struct jit_ctx *ctx, unsigned offset)
-{
- int i = 0, real_off = 0;
- u32 sflags, tmp_flags;
-
- /* Adjust the stack pointer */
- if (offset)
- emit_stack_offset(-align_sp(offset), ctx);
-
- tmp_flags = sflags = ctx->flags >> SEEN_SREG_SFT;
- /* sflags is essentially a bitmap */
- while (tmp_flags) {
- if ((sflags >> i) & 0x1) {
- emit_store_stack_reg(MIPS_R_S0 + i, r_sp, real_off,
- ctx);
- real_off += SZREG;
- }
- i++;
- tmp_flags >>= 1;
- }
-
- /* save return address */
- if (ctx->flags & SEEN_CALL) {
- emit_store_stack_reg(r_ra, r_sp, real_off, ctx);
- real_off += SZREG;
- }
-
- /* Setup r_M leaving the alignment gap if necessary */
- if (ctx->flags & SEEN_MEM) {
- if (real_off % (SZREG * 2))
- real_off += SZREG;
- emit_long_instr(ctx, ADDIU, r_M, r_sp, real_off);
- }
-}
-
-static void restore_bpf_jit_regs(struct jit_ctx *ctx,
- unsigned int offset)
-{
- int i, real_off = 0;
- u32 sflags, tmp_flags;
-
- tmp_flags = sflags = ctx->flags >> SEEN_SREG_SFT;
- /* sflags is a bitmap */
- i = 0;
- while (tmp_flags) {
- if ((sflags >> i) & 0x1) {
- emit_load_stack_reg(MIPS_R_S0 + i, r_sp, real_off,
- ctx);
- real_off += SZREG;
- }
- i++;
- tmp_flags >>= 1;
- }
-
- /* restore return address */
- if (ctx->flags & SEEN_CALL)
- emit_load_stack_reg(r_ra, r_sp, real_off, ctx);
-
- /* Restore the sp and discard the scrach memory */
- if (offset)
- emit_stack_offset(align_sp(offset), ctx);
-}
-
-static unsigned int get_stack_depth(struct jit_ctx *ctx)
-{
- int sp_off = 0;
-
-
- /* How may s* regs do we need to preserved? */
- sp_off += hweight32(ctx->flags >> SEEN_SREG_SFT) * SZREG;
-
- if (ctx->flags & SEEN_MEM)
- sp_off += 4 * BPF_MEMWORDS; /* BPF_MEMWORDS are 32-bit */
-
- if (ctx->flags & SEEN_CALL)
- sp_off += SZREG; /* Space for our ra register */
-
- return sp_off;
-}
-
-static void build_prologue(struct jit_ctx *ctx)
-{
- int sp_off;
-
- /* Calculate the total offset for the stack pointer */
- sp_off = get_stack_depth(ctx);
- save_bpf_jit_regs(ctx, sp_off);
-
- if (ctx->flags & SEEN_SKB)
- emit_reg_move(r_skb, MIPS_R_A0, ctx);
-
- if (ctx->flags & SEEN_SKB_DATA) {
- /* Load packet length */
- emit_load(r_skb_len, r_skb, offsetof(struct sk_buff, len),
- ctx);
- emit_load(r_tmp, r_skb, offsetof(struct sk_buff, data_len),
- ctx);
- /* Load the data pointer */
- emit_load_ptr(r_skb_data, r_skb,
- offsetof(struct sk_buff, data), ctx);
- /* Load the header length */
- emit_subu(r_skb_hl, r_skb_len, r_tmp, ctx);
- }
-
- if (ctx->flags & SEEN_X)
- emit_jit_reg_move(r_X, r_zero, ctx);
-
- /*
- * Do not leak kernel data to userspace, we only need to clear
- * r_A if it is ever used. In fact if it is never used, we
- * will not save/restore it, so clearing it in this case would
- * corrupt the state of the caller.
- */
- if (bpf_needs_clear_a(&ctx->skf->insns[0]) &&
- (ctx->flags & SEEN_A))
- emit_jit_reg_move(r_A, r_zero, ctx);
-}
-
-static void build_epilogue(struct jit_ctx *ctx)
-{
- unsigned int sp_off;
-
- /* Calculate the total offset for the stack pointer */
-
- sp_off = get_stack_depth(ctx);
- restore_bpf_jit_regs(ctx, sp_off);
-
- /* Return */
- emit_jr(r_ra, ctx);
- emit_nop(ctx);
-}
-
-#define CHOOSE_LOAD_FUNC(K, func) \
- ((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative : func) : \
- func##_positive)
-
-static int build_body(struct jit_ctx *ctx)
-{
- const struct bpf_prog *prog = ctx->skf;
- const struct sock_filter *inst;
- unsigned int i, off, condt;
- u32 k, b_off __maybe_unused;
- u8 (*sk_load_func)(unsigned long *skb, int offset);
-
- for (i = 0; i < prog->len; i++) {
- u16 code;
-
- inst = &(prog->insns[i]);
- pr_debug("%s: code->0x%02x, jt->0x%x, jf->0x%x, k->0x%x\n",
- __func__, inst->code, inst->jt, inst->jf, inst->k);
- k = inst->k;
- code = bpf_anc_helper(inst);
-
- if (ctx->target == NULL)
- ctx->offsets[i] = ctx->idx * 4;
-
- switch (code) {
- case BPF_LD | BPF_IMM:
- /* A <- k ==> li r_A, k */
- ctx->flags |= SEEN_A;
- emit_load_imm(r_A, k, ctx);
- break;
- case BPF_LD | BPF_W | BPF_LEN:
- BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, len) != 4);
- /* A <- len ==> lw r_A, offset(skb) */
- ctx->flags |= SEEN_SKB | SEEN_A;
- off = offsetof(struct sk_buff, len);
- emit_load(r_A, r_skb, off, ctx);
- break;
- case BPF_LD | BPF_MEM:
- /* A <- M[k] ==> lw r_A, offset(M) */
- ctx->flags |= SEEN_MEM | SEEN_A;
- emit_load(r_A, r_M, SCRATCH_OFF(k), ctx);
- break;
- case BPF_LD | BPF_W | BPF_ABS:
- /* A <- P[k:4] */
- sk_load_func = CHOOSE_LOAD_FUNC(k, sk_load_word);
- goto load;
- case BPF_LD | BPF_H | BPF_ABS:
- /* A <- P[k:2] */
- sk_load_func = CHOOSE_LOAD_FUNC(k, sk_load_half);
- goto load;
- case BPF_LD | BPF_B | BPF_ABS:
- /* A <- P[k:1] */
- sk_load_func = CHOOSE_LOAD_FUNC(k, sk_load_byte);
-load:
- emit_load_imm(r_off, k, ctx);
-load_common:
- ctx->flags |= SEEN_CALL | SEEN_OFF |
- SEEN_SKB | SEEN_A | SEEN_SKB_DATA;
-
- emit_load_func(r_s0, (ptr)sk_load_func, ctx);
- emit_reg_move(MIPS_R_A0, r_skb, ctx);
- emit_jalr(MIPS_R_RA, r_s0, ctx);
- /* Load second argument to delay slot */
- emit_reg_move(MIPS_R_A1, r_off, ctx);
- /* Check the error value */
- emit_bcond(MIPS_COND_EQ, r_ret, 0, b_imm(i + 1, ctx),
- ctx);
- /* Load return register on DS for failures */
- emit_reg_move(r_ret, r_zero, ctx);
- /* Return with error */
- emit_b(b_imm(prog->len, ctx), ctx);
- emit_nop(ctx);
- break;
- case BPF_LD | BPF_W | BPF_IND:
- /* A <- P[X + k:4] */
- sk_load_func = sk_load_word;
- goto load_ind;
- case BPF_LD | BPF_H | BPF_IND:
- /* A <- P[X + k:2] */
- sk_load_func = sk_load_half;
- goto load_ind;
- case BPF_LD | BPF_B | BPF_IND:
- /* A <- P[X + k:1] */
- sk_load_func = sk_load_byte;
-load_ind:
- ctx->flags |= SEEN_OFF | SEEN_X;
- emit_addiu(r_off, r_X, k, ctx);
- goto load_common;
- case BPF_LDX | BPF_IMM:
- /* X <- k */
- ctx->flags |= SEEN_X;
- emit_load_imm(r_X, k, ctx);
- break;
- case BPF_LDX | BPF_MEM:
- /* X <- M[k] */
- ctx->flags |= SEEN_X | SEEN_MEM;
- emit_load(r_X, r_M, SCRATCH_OFF(k), ctx);
- break;
- case BPF_LDX | BPF_W | BPF_LEN:
- /* X <- len */
- ctx->flags |= SEEN_X | SEEN_SKB;
- off = offsetof(struct sk_buff, len);
- emit_load(r_X, r_skb, off, ctx);
- break;
- case BPF_LDX | BPF_B | BPF_MSH:
- /* X <- 4 * (P[k:1] & 0xf) */
- ctx->flags |= SEEN_X | SEEN_CALL | SEEN_SKB;
- /* Load offset to a1 */
- emit_load_func(r_s0, (ptr)sk_load_byte, ctx);
- /*
- * This may emit two instructions so it may not fit
- * in the delay slot. So use a0 in the delay slot.
- */
- emit_load_imm(MIPS_R_A1, k, ctx);
- emit_jalr(MIPS_R_RA, r_s0, ctx);
- emit_reg_move(MIPS_R_A0, r_skb, ctx); /* delay slot */
- /* Check the error value */
- emit_bcond(MIPS_COND_NE, r_ret, 0,
- b_imm(prog->len, ctx), ctx);
- emit_reg_move(r_ret, r_zero, ctx);
- /* We are good */
- /* X <- P[1:K] & 0xf */
- emit_andi(r_X, r_A, 0xf, ctx);
- /* X << 2 */
- emit_b(b_imm(i + 1, ctx), ctx);
- emit_sll(r_X, r_X, 2, ctx); /* delay slot */
- break;
- case BPF_ST:
- /* M[k] <- A */
- ctx->flags |= SEEN_MEM | SEEN_A;
- emit_store(r_A, r_M, SCRATCH_OFF(k), ctx);
- break;
- case BPF_STX:
- /* M[k] <- X */
- ctx->flags |= SEEN_MEM | SEEN_X;
- emit_store(r_X, r_M, SCRATCH_OFF(k), ctx);
- break;
- case BPF_ALU | BPF_ADD | BPF_K:
- /* A += K */
- ctx->flags |= SEEN_A;
- emit_addiu(r_A, r_A, k, ctx);
- break;
- case BPF_ALU | BPF_ADD | BPF_X:
- /* A += X */
- ctx->flags |= SEEN_A | SEEN_X;
- emit_addu(r_A, r_A, r_X, ctx);
- break;
- case BPF_ALU | BPF_SUB | BPF_K:
- /* A -= K */
- ctx->flags |= SEEN_A;
- emit_addiu(r_A, r_A, -k, ctx);
- break;
- case BPF_ALU | BPF_SUB | BPF_X:
- /* A -= X */
- ctx->flags |= SEEN_A | SEEN_X;
- emit_subu(r_A, r_A, r_X, ctx);
- break;
- case BPF_ALU | BPF_MUL | BPF_K:
- /* A *= K */
- /* Load K to scratch register before MUL */
- ctx->flags |= SEEN_A;
- emit_load_imm(r_s0, k, ctx);
- emit_mul(r_A, r_A, r_s0, ctx);
- break;
- case BPF_ALU | BPF_MUL | BPF_X:
- /* A *= X */
- ctx->flags |= SEEN_A | SEEN_X;
- emit_mul(r_A, r_A, r_X, ctx);
- break;
- case BPF_ALU | BPF_DIV | BPF_K:
- /* A /= k */
- if (k == 1)
- break;
- if (optimize_div(&k)) {
- ctx->flags |= SEEN_A;
- emit_srl(r_A, r_A, k, ctx);
- break;
- }
- ctx->flags |= SEEN_A;
- emit_load_imm(r_s0, k, ctx);
- emit_div(r_A, r_s0, ctx);
- break;
- case BPF_ALU | BPF_MOD | BPF_K:
- /* A %= k */
- if (k == 1) {
- ctx->flags |= SEEN_A;
- emit_jit_reg_move(r_A, r_zero, ctx);
- } else {
- ctx->flags |= SEEN_A;
- emit_load_imm(r_s0, k, ctx);
- emit_mod(r_A, r_s0, ctx);
- }
- break;
- case BPF_ALU | BPF_DIV | BPF_X:
- /* A /= X */
- ctx->flags |= SEEN_X | SEEN_A;
- /* Check if r_X is zero */
- emit_bcond(MIPS_COND_EQ, r_X, r_zero,
- b_imm(prog->len, ctx), ctx);
- emit_load_imm(r_ret, 0, ctx); /* delay slot */
- emit_div(r_A, r_X, ctx);
- break;
- case BPF_ALU | BPF_MOD | BPF_X:
- /* A %= X */
- ctx->flags |= SEEN_X | SEEN_A;
- /* Check if r_X is zero */
- emit_bcond(MIPS_COND_EQ, r_X, r_zero,
- b_imm(prog->len, ctx), ctx);
- emit_load_imm(r_ret, 0, ctx); /* delay slot */
- emit_mod(r_A, r_X, ctx);
- break;
- case BPF_ALU | BPF_OR | BPF_K:
- /* A |= K */
- ctx->flags |= SEEN_A;
- emit_ori(r_A, r_A, k, ctx);
- break;
- case BPF_ALU | BPF_OR | BPF_X:
- /* A |= X */
- ctx->flags |= SEEN_A;
- emit_ori(r_A, r_A, r_X, ctx);
- break;
- case BPF_ALU | BPF_XOR | BPF_K:
- /* A ^= k */
- ctx->flags |= SEEN_A;
- emit_xori(r_A, r_A, k, ctx);
- break;
- case BPF_ANC | SKF_AD_ALU_XOR_X:
- case BPF_ALU | BPF_XOR | BPF_X:
- /* A ^= X */
- ctx->flags |= SEEN_A;
- emit_xor(r_A, r_A, r_X, ctx);
- break;
- case BPF_ALU | BPF_AND | BPF_K:
- /* A &= K */
- ctx->flags |= SEEN_A;
- emit_andi(r_A, r_A, k, ctx);
- break;
- case BPF_ALU | BPF_AND | BPF_X:
- /* A &= X */
- ctx->flags |= SEEN_A | SEEN_X;
- emit_and(r_A, r_A, r_X, ctx);
- break;
- case BPF_ALU | BPF_LSH | BPF_K:
- /* A <<= K */
- ctx->flags |= SEEN_A;
- emit_sll(r_A, r_A, k, ctx);
- break;
- case BPF_ALU | BPF_LSH | BPF_X:
- /* A <<= X */
- ctx->flags |= SEEN_A | SEEN_X;
- emit_sllv(r_A, r_A, r_X, ctx);
- break;
- case BPF_ALU | BPF_RSH | BPF_K:
- /* A >>= K */
- ctx->flags |= SEEN_A;
- emit_srl(r_A, r_A, k, ctx);
- break;
- case BPF_ALU | BPF_RSH | BPF_X:
- ctx->flags |= SEEN_A | SEEN_X;
- emit_srlv(r_A, r_A, r_X, ctx);
- break;
- case BPF_ALU | BPF_NEG:
- /* A = -A */
- ctx->flags |= SEEN_A;
- emit_neg(r_A, ctx);
- break;
- case BPF_JMP | BPF_JA:
- /* pc += K */
- emit_b(b_imm(i + k + 1, ctx), ctx);
- emit_nop(ctx);
- break;
- case BPF_JMP | BPF_JEQ | BPF_K:
- /* pc += ( A == K ) ? pc->jt : pc->jf */
- condt = MIPS_COND_EQ | MIPS_COND_K;
- goto jmp_cmp;
- case BPF_JMP | BPF_JEQ | BPF_X:
- ctx->flags |= SEEN_X;
- /* pc += ( A == X ) ? pc->jt : pc->jf */
- condt = MIPS_COND_EQ | MIPS_COND_X;
- goto jmp_cmp;
- case BPF_JMP | BPF_JGE | BPF_K:
- /* pc += ( A >= K ) ? pc->jt : pc->jf */
- condt = MIPS_COND_GE | MIPS_COND_K;
- goto jmp_cmp;
- case BPF_JMP | BPF_JGE | BPF_X:
- ctx->flags |= SEEN_X;
- /* pc += ( A >= X ) ? pc->jt : pc->jf */
- condt = MIPS_COND_GE | MIPS_COND_X;
- goto jmp_cmp;
- case BPF_JMP | BPF_JGT | BPF_K:
- /* pc += ( A > K ) ? pc->jt : pc->jf */
- condt = MIPS_COND_GT | MIPS_COND_K;
- goto jmp_cmp;
- case BPF_JMP | BPF_JGT | BPF_X:
- ctx->flags |= SEEN_X;
- /* pc += ( A > X ) ? pc->jt : pc->jf */
- condt = MIPS_COND_GT | MIPS_COND_X;
-jmp_cmp:
- /* Greater or Equal */
- if ((condt & MIPS_COND_GE) ||
- (condt & MIPS_COND_GT)) {
- if (condt & MIPS_COND_K) { /* K */
- ctx->flags |= SEEN_A;
- emit_sltiu(r_s0, r_A, k, ctx);
- } else { /* X */
- ctx->flags |= SEEN_A |
- SEEN_X;
- emit_sltu(r_s0, r_A, r_X, ctx);
- }
- /* A < (K|X) ? r_scrach = 1 */
- b_off = b_imm(i + inst->jf + 1, ctx);
- emit_bcond(MIPS_COND_NE, r_s0, r_zero, b_off,
- ctx);
- emit_nop(ctx);
- /* A > (K|X) ? scratch = 0 */
- if (condt & MIPS_COND_GT) {
- /* Checking for equality */
- ctx->flags |= SEEN_A | SEEN_X;
- if (condt & MIPS_COND_K)
- emit_load_imm(r_s0, k, ctx);
- else
- emit_jit_reg_move(r_s0, r_X,
- ctx);
- b_off = b_imm(i + inst->jf + 1, ctx);
- emit_bcond(MIPS_COND_EQ, r_A, r_s0,
- b_off, ctx);
- emit_nop(ctx);
- /* Finally, A > K|X */
- b_off = b_imm(i + inst->jt + 1, ctx);
- emit_b(b_off, ctx);
- emit_nop(ctx);
- } else {
- /* A >= (K|X) so jump */
- b_off = b_imm(i + inst->jt + 1, ctx);
- emit_b(b_off, ctx);
- emit_nop(ctx);
- }
- } else {
- /* A == K|X */
- if (condt & MIPS_COND_K) { /* K */
- ctx->flags |= SEEN_A;
- emit_load_imm(r_s0, k, ctx);
- /* jump true */
- b_off = b_imm(i + inst->jt + 1, ctx);
- emit_bcond(MIPS_COND_EQ, r_A, r_s0,
- b_off, ctx);
- emit_nop(ctx);
- /* jump false */
- b_off = b_imm(i + inst->jf + 1,
- ctx);
- emit_bcond(MIPS_COND_NE, r_A, r_s0,
- b_off, ctx);
- emit_nop(ctx);
- } else { /* X */
- /* jump true */
- ctx->flags |= SEEN_A | SEEN_X;
- b_off = b_imm(i + inst->jt + 1,
- ctx);
- emit_bcond(MIPS_COND_EQ, r_A, r_X,
- b_off, ctx);
- emit_nop(ctx);
- /* jump false */
- b_off = b_imm(i + inst->jf + 1, ctx);
- emit_bcond(MIPS_COND_NE, r_A, r_X,
- b_off, ctx);
- emit_nop(ctx);
- }
- }
- break;
- case BPF_JMP | BPF_JSET | BPF_K:
- ctx->flags |= SEEN_A;
- /* pc += (A & K) ? pc -> jt : pc -> jf */
- emit_load_imm(r_s1, k, ctx);
- emit_and(r_s0, r_A, r_s1, ctx);
- /* jump true */
- b_off = b_imm(i + inst->jt + 1, ctx);
- emit_bcond(MIPS_COND_NE, r_s0, r_zero, b_off, ctx);
- emit_nop(ctx);
- /* jump false */
- b_off = b_imm(i + inst->jf + 1, ctx);
- emit_b(b_off, ctx);
- emit_nop(ctx);
- break;
- case BPF_JMP | BPF_JSET | BPF_X:
- ctx->flags |= SEEN_X | SEEN_A;
- /* pc += (A & X) ? pc -> jt : pc -> jf */
- emit_and(r_s0, r_A, r_X, ctx);
- /* jump true */
- b_off = b_imm(i + inst->jt + 1, ctx);
- emit_bcond(MIPS_COND_NE, r_s0, r_zero, b_off, ctx);
- emit_nop(ctx);
- /* jump false */
- b_off = b_imm(i + inst->jf + 1, ctx);
- emit_b(b_off, ctx);
- emit_nop(ctx);
- break;
- case BPF_RET | BPF_A:
- ctx->flags |= SEEN_A;
- if (i != prog->len - 1)
- /*
- * If this is not the last instruction
- * then jump to the epilogue
- */
- emit_b(b_imm(prog->len, ctx), ctx);
- emit_reg_move(r_ret, r_A, ctx); /* delay slot */
- break;
- case BPF_RET | BPF_K:
- /*
- * It can emit two instructions so it does not fit on
- * the delay slot.
- */
- emit_load_imm(r_ret, k, ctx);
- if (i != prog->len - 1) {
- /*
- * If this is not the last instruction
- * then jump to the epilogue
- */
- emit_b(b_imm(prog->len, ctx), ctx);
- emit_nop(ctx);
- }
- break;
- case BPF_MISC | BPF_TAX:
- /* X = A */
- ctx->flags |= SEEN_X | SEEN_A;
- emit_jit_reg_move(r_X, r_A, ctx);
- break;
- case BPF_MISC | BPF_TXA:
- /* A = X */
- ctx->flags |= SEEN_A | SEEN_X;
- emit_jit_reg_move(r_A, r_X, ctx);
- break;
- /* AUX */
- case BPF_ANC | SKF_AD_PROTOCOL:
- /* A = ntohs(skb->protocol */
- ctx->flags |= SEEN_SKB | SEEN_OFF | SEEN_A;
- BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff,
- protocol) != 2);
- off = offsetof(struct sk_buff, protocol);
- emit_half_load(r_A, r_skb, off, ctx);
-#ifdef CONFIG_CPU_LITTLE_ENDIAN
- /* This needs little endian fixup */
- if (cpu_has_wsbh) {
- /* R2 and later have the wsbh instruction */
- emit_wsbh(r_A, r_A, ctx);
- } else {
- /* Get first byte */
- emit_andi(r_tmp_imm, r_A, 0xff, ctx);
- /* Shift it */
- emit_sll(r_tmp, r_tmp_imm, 8, ctx);
- /* Get second byte */
- emit_srl(r_tmp_imm, r_A, 8, ctx);
- emit_andi(r_tmp_imm, r_tmp_imm, 0xff, ctx);
- /* Put everyting together in r_A */
- emit_or(r_A, r_tmp, r_tmp_imm, ctx);
- }
-#endif
- break;
- case BPF_ANC | SKF_AD_CPU:
- ctx->flags |= SEEN_A | SEEN_OFF;
- /* A = current_thread_info()->cpu */
- BUILD_BUG_ON(FIELD_SIZEOF(struct thread_info,
- cpu) != 4);
- off = offsetof(struct thread_info, cpu);
- /* $28/gp points to the thread_info struct */
- emit_load(r_A, 28, off, ctx);
- break;
- case BPF_ANC | SKF_AD_IFINDEX:
- /* A = skb->dev->ifindex */
- case BPF_ANC | SKF_AD_HATYPE:
- /* A = skb->dev->type */
- ctx->flags |= SEEN_SKB | SEEN_A;
- off = offsetof(struct sk_buff, dev);
- /* Load *dev pointer */
- emit_load_ptr(r_s0, r_skb, off, ctx);
- /* error (0) in the delay slot */
- emit_bcond(MIPS_COND_EQ, r_s0, r_zero,
- b_imm(prog->len, ctx), ctx);
- emit_reg_move(r_ret, r_zero, ctx);
- if (code == (BPF_ANC | SKF_AD_IFINDEX)) {
- BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, ifindex) != 4);
- off = offsetof(struct net_device, ifindex);
- emit_load(r_A, r_s0, off, ctx);
- } else { /* (code == (BPF_ANC | SKF_AD_HATYPE) */
- BUILD_BUG_ON(FIELD_SIZEOF(struct net_device, type) != 2);
- off = offsetof(struct net_device, type);
- emit_half_load_unsigned(r_A, r_s0, off, ctx);
- }
- break;
- case BPF_ANC | SKF_AD_MARK:
- ctx->flags |= SEEN_SKB | SEEN_A;
- BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, mark) != 4);
- off = offsetof(struct sk_buff, mark);
- emit_load(r_A, r_skb, off, ctx);
- break;
- case BPF_ANC | SKF_AD_RXHASH:
- ctx->flags |= SEEN_SKB | SEEN_A;
- BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, hash) != 4);
- off = offsetof(struct sk_buff, hash);
- emit_load(r_A, r_skb, off, ctx);
- break;
- case BPF_ANC | SKF_AD_VLAN_TAG:
- ctx->flags |= SEEN_SKB | SEEN_A;
- BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff,
- vlan_tci) != 2);
- off = offsetof(struct sk_buff, vlan_tci);
- emit_half_load_unsigned(r_A, r_skb, off, ctx);
- break;
- case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT:
- ctx->flags |= SEEN_SKB | SEEN_A;
- emit_load_byte(r_A, r_skb, PKT_VLAN_PRESENT_OFFSET(), ctx);
- if (PKT_VLAN_PRESENT_BIT)
- emit_srl(r_A, r_A, PKT_VLAN_PRESENT_BIT, ctx);
- if (PKT_VLAN_PRESENT_BIT < 7)
- emit_andi(r_A, r_A, 1, ctx);
- break;
- case BPF_ANC | SKF_AD_PKTTYPE:
- ctx->flags |= SEEN_SKB;
-
- emit_load_byte(r_tmp, r_skb, PKT_TYPE_OFFSET(), ctx);
- /* Keep only the last 3 bits */
- emit_andi(r_A, r_tmp, PKT_TYPE_MAX, ctx);
-#ifdef __BIG_ENDIAN_BITFIELD
- /* Get the actual packet type to the lower 3 bits */
- emit_srl(r_A, r_A, 5, ctx);
-#endif
- break;
- case BPF_ANC | SKF_AD_QUEUE:
- ctx->flags |= SEEN_SKB | SEEN_A;
- BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff,
- queue_mapping) != 2);
- BUILD_BUG_ON(offsetof(struct sk_buff,
- queue_mapping) > 0xff);
- off = offsetof(struct sk_buff, queue_mapping);
- emit_half_load_unsigned(r_A, r_skb, off, ctx);
- break;
- default:
- pr_debug("%s: Unhandled opcode: 0x%02x\n", __FILE__,
- inst->code);
- return -1;
- }
- }
-
- /* compute offsets only during the first pass */
- if (ctx->target == NULL)
- ctx->offsets[i] = ctx->idx * 4;
-
- return 0;
-}
-
-void bpf_jit_compile(struct bpf_prog *fp)
-{
- struct jit_ctx ctx;
- unsigned int alloc_size, tmp_idx;
-
- if (!bpf_jit_enable)
- return;
-
- memset(&ctx, 0, sizeof(ctx));
-
- ctx.offsets = kcalloc(fp->len + 1, sizeof(*ctx.offsets), GFP_KERNEL);
- if (ctx.offsets == NULL)
- return;
-
- ctx.skf = fp;
-
- if (build_body(&ctx))
- goto out;
-
- tmp_idx = ctx.idx;
- build_prologue(&ctx);
- ctx.prologue_bytes = (ctx.idx - tmp_idx) * 4;
- /* just to complete the ctx.idx count */
- build_epilogue(&ctx);
-
- alloc_size = 4 * ctx.idx;
- ctx.target = module_alloc(alloc_size);
- if (ctx.target == NULL)
- goto out;
-
- /* Clean it */
- memset(ctx.target, 0, alloc_size);
-
- ctx.idx = 0;
-
- /* Generate the actual JIT code */
- build_prologue(&ctx);
- build_body(&ctx);
- build_epilogue(&ctx);
-
- /* Update the icache */
- flush_icache_range((ptr)ctx.target, (ptr)(ctx.target + ctx.idx));
-
- if (bpf_jit_enable > 1)
- /* Dump JIT code */
- bpf_jit_dump(fp->len, alloc_size, 2, ctx.target);
-
- fp->bpf_func = (void *)ctx.target;
- fp->jited = 1;
-
-out:
- kfree(ctx.offsets);
-}
-
-void bpf_jit_free(struct bpf_prog *fp)
-{
- if (fp->jited)
- module_memfree(fp->bpf_func);
-
- bpf_prog_unlock_free(fp);
-}
}
/* Simply emit the instruction if the JIT memory space has been allocated */
-#define emit_instr(ctx, func, ...) \
-do { \
- if ((ctx)->target != NULL) { \
- u32 *p = &(ctx)->target[ctx->idx]; \
- uasm_i_##func(&p, ##__VA_ARGS__); \
- } \
- (ctx)->idx++; \
+#define emit_instr_long(ctx, func64, func32, ...) \
+do { \
+ if ((ctx)->target != NULL) { \
+ u32 *p = &(ctx)->target[ctx->idx]; \
+ if (IS_ENABLED(CONFIG_64BIT)) \
+ uasm_i_##func64(&p, ##__VA_ARGS__); \
+ else \
+ uasm_i_##func32(&p, ##__VA_ARGS__); \
+ } \
+ (ctx)->idx++; \
} while (0)
+#define emit_instr(ctx, func, ...) \
+ emit_instr_long(ctx, func, func, ##__VA_ARGS__)
+
static unsigned int j_target(struct jit_ctx *ctx, int target_idx)
{
unsigned long target_va, base_va;
* If RA we are doing a function call and may need
* extra 8-byte tmp area.
*/
- stack_adjust += 16;
+ stack_adjust += 2 * sizeof(long);
if (ctx->flags & EBPF_SAVE_S0)
- stack_adjust += 8;
+ stack_adjust += sizeof(long);
if (ctx->flags & EBPF_SAVE_S1)
- stack_adjust += 8;
+ stack_adjust += sizeof(long);
if (ctx->flags & EBPF_SAVE_S2)
- stack_adjust += 8;
+ stack_adjust += sizeof(long);
if (ctx->flags & EBPF_SAVE_S3)
- stack_adjust += 8;
+ stack_adjust += sizeof(long);
if (ctx->flags & EBPF_SAVE_S4)
- stack_adjust += 8;
+ stack_adjust += sizeof(long);
BUILD_BUG_ON(MAX_BPF_STACK & 7);
locals_size = (ctx->flags & EBPF_SEEN_FP) ? MAX_BPF_STACK : 0;
* On tail call we skip this instruction, and the TCC is
* passed in $v1 from the caller.
*/
- emit_instr(ctx, daddiu, MIPS_R_V1, MIPS_R_ZERO, MAX_TAIL_CALL_CNT);
+ emit_instr(ctx, addiu, MIPS_R_V1, MIPS_R_ZERO, MAX_TAIL_CALL_CNT);
if (stack_adjust)
- emit_instr(ctx, daddiu, MIPS_R_SP, MIPS_R_SP, -stack_adjust);
+ emit_instr_long(ctx, daddiu, addiu,
+ MIPS_R_SP, MIPS_R_SP, -stack_adjust);
else
return 0;
- store_offset = stack_adjust - 8;
+ store_offset = stack_adjust - sizeof(long);
if (ctx->flags & EBPF_SAVE_RA) {
- emit_instr(ctx, sd, MIPS_R_RA, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, sd, sw,
+ MIPS_R_RA, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if (ctx->flags & EBPF_SAVE_S0) {
- emit_instr(ctx, sd, MIPS_R_S0, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, sd, sw,
+ MIPS_R_S0, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if (ctx->flags & EBPF_SAVE_S1) {
- emit_instr(ctx, sd, MIPS_R_S1, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, sd, sw,
+ MIPS_R_S1, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if (ctx->flags & EBPF_SAVE_S2) {
- emit_instr(ctx, sd, MIPS_R_S2, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, sd, sw,
+ MIPS_R_S2, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if (ctx->flags & EBPF_SAVE_S3) {
- emit_instr(ctx, sd, MIPS_R_S3, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, sd, sw,
+ MIPS_R_S3, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if (ctx->flags & EBPF_SAVE_S4) {
- emit_instr(ctx, sd, MIPS_R_S4, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, sd, sw,
+ MIPS_R_S4, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if ((ctx->flags & EBPF_SEEN_TC) && !(ctx->flags & EBPF_TCC_IN_V1))
- emit_instr(ctx, daddu, MIPS_R_S4, MIPS_R_V1, MIPS_R_ZERO);
+ emit_instr_long(ctx, daddu, addu,
+ MIPS_R_S4, MIPS_R_V1, MIPS_R_ZERO);
return 0;
}
{
const struct bpf_prog *prog = ctx->skf;
int stack_adjust = ctx->stack_size;
- int store_offset = stack_adjust - 8;
+ int store_offset = stack_adjust - sizeof(long);
enum reg_val_type td;
int r0 = MIPS_R_V0;
}
if (ctx->flags & EBPF_SAVE_RA) {
- emit_instr(ctx, ld, MIPS_R_RA, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, ld, lw,
+ MIPS_R_RA, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if (ctx->flags & EBPF_SAVE_S0) {
- emit_instr(ctx, ld, MIPS_R_S0, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, ld, lw,
+ MIPS_R_S0, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if (ctx->flags & EBPF_SAVE_S1) {
- emit_instr(ctx, ld, MIPS_R_S1, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, ld, lw,
+ MIPS_R_S1, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if (ctx->flags & EBPF_SAVE_S2) {
- emit_instr(ctx, ld, MIPS_R_S2, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, ld, lw,
+ MIPS_R_S2, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if (ctx->flags & EBPF_SAVE_S3) {
- emit_instr(ctx, ld, MIPS_R_S3, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, ld, lw,
+ MIPS_R_S3, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
if (ctx->flags & EBPF_SAVE_S4) {
- emit_instr(ctx, ld, MIPS_R_S4, store_offset, MIPS_R_SP);
- store_offset -= 8;
+ emit_instr_long(ctx, ld, lw,
+ MIPS_R_S4, store_offset, MIPS_R_SP);
+ store_offset -= sizeof(long);
}
emit_instr(ctx, jr, dest_reg);
if (stack_adjust)
- emit_instr(ctx, daddiu, MIPS_R_SP, MIPS_R_SP, stack_adjust);
+ emit_instr_long(ctx, daddiu, addiu,
+ MIPS_R_SP, MIPS_R_SP, stack_adjust);
else
emit_instr(ctx, nop);
s64 t64s;
int bpf_op = BPF_OP(insn->code);
+ if (IS_ENABLED(CONFIG_32BIT) && ((BPF_CLASS(insn->code) == BPF_ALU64)
+ || (bpf_op == BPF_DW)))
+ return -EINVAL;
+
switch (insn->code) {
case BPF_ALU64 | BPF_ADD | BPF_K: /* ALU64_IMM */
case BPF_ALU64 | BPF_SUB | BPF_K: /* ALU64_IMM */
case BPF_JMP | BPF_CALL:
ctx->flags |= EBPF_SAVE_RA;
- t64s = (s64)insn->imm + (s64)__bpf_call_base;
+ t64s = (s64)insn->imm + (long)__bpf_call_base;
emit_const_to_reg(ctx, MIPS_R_T9, (u64)t64s);
emit_instr(ctx, jalr, MIPS_R_RA, MIPS_R_T9);
/* delay slot */
projects / linux.git / commitdiff