diff options
Diffstat (limited to 'arch/sparc/net/bpf_jit_comp.c')
| -rw-r--r-- | arch/sparc/net/bpf_jit_comp.c | 815 |
1 files changed, 0 insertions, 815 deletions
diff --git a/arch/sparc/net/bpf_jit_comp.c b/arch/sparc/net/bpf_jit_comp.c deleted file mode 100644 index a6d9204a6a0b..000000000000 --- a/arch/sparc/net/bpf_jit_comp.c +++ /dev/null @@ -1,815 +0,0 @@ -#include <linux/moduleloader.h> -#include <linux/workqueue.h> -#include <linux/netdevice.h> -#include <linux/filter.h> -#include <linux/cache.h> -#include <linux/if_vlan.h> - -#include <asm/cacheflush.h> -#include <asm/ptrace.h> - -#include "bpf_jit.h" - -int bpf_jit_enable __read_mostly; - -static inline bool is_simm13(unsigned int value) -{ - return value + 0x1000 < 0x2000; -} - -static void bpf_flush_icache(void *start_, void *end_) -{ -#ifdef CONFIG_SPARC64 - /* Cheetah's I-cache is fully coherent. */ - if (tlb_type == spitfire) { - unsigned long start = (unsigned long) start_; - unsigned long end = (unsigned long) end_; - - start &= ~7UL; - end = (end + 7UL) & ~7UL; - while (start < end) { - flushi(start); - start += 32; - } - } -#endif -} - -#define SEEN_DATAREF 1 /* might call external helpers */ -#define SEEN_XREG 2 /* ebx is used */ -#define SEEN_MEM 4 /* use mem[] for temporary storage */ - -#define S13(X) ((X) & 0x1fff) -#define IMMED 0x00002000 -#define RD(X) ((X) << 25) -#define RS1(X) ((X) << 14) -#define RS2(X) ((X)) -#define OP(X) ((X) << 30) -#define OP2(X) ((X) << 22) -#define OP3(X) ((X) << 19) -#define COND(X) ((X) << 25) -#define F1(X) OP(X) -#define F2(X, Y) (OP(X) | OP2(Y)) -#define F3(X, Y) (OP(X) | OP3(Y)) - -#define CONDN COND(0x0) -#define CONDE COND(0x1) -#define CONDLE COND(0x2) -#define CONDL COND(0x3) -#define CONDLEU COND(0x4) -#define CONDCS COND(0x5) -#define CONDNEG COND(0x6) -#define CONDVC COND(0x7) -#define CONDA COND(0x8) -#define CONDNE COND(0x9) -#define CONDG COND(0xa) -#define CONDGE COND(0xb) -#define CONDGU COND(0xc) -#define CONDCC COND(0xd) -#define CONDPOS COND(0xe) -#define CONDVS COND(0xf) - -#define CONDGEU CONDCC -#define CONDLU CONDCS - -#define WDISP22(X) (((X) >> 2) & 0x3fffff) - -#define BA (F2(0, 2) | CONDA) -#define BGU (F2(0, 2) | CONDGU) -#define BLEU (F2(0, 2) | CONDLEU) -#define BGEU (F2(0, 2) | CONDGEU) -#define BLU (F2(0, 2) | CONDLU) -#define BE (F2(0, 2) | CONDE) -#define BNE (F2(0, 2) | CONDNE) - -#ifdef CONFIG_SPARC64 -#define BE_PTR (F2(0, 1) | CONDE | (2 << 20)) -#else -#define BE_PTR BE -#endif - -#define SETHI(K, REG) \ - (F2(0, 0x4) | RD(REG) | (((K) >> 10) & 0x3fffff)) -#define OR_LO(K, REG) \ - (F3(2, 0x02) | IMMED | RS1(REG) | ((K) & 0x3ff) | RD(REG)) - -#define ADD F3(2, 0x00) -#define AND F3(2, 0x01) -#define ANDCC F3(2, 0x11) -#define OR F3(2, 0x02) -#define XOR F3(2, 0x03) -#define SUB F3(2, 0x04) -#define SUBCC F3(2, 0x14) -#define MUL F3(2, 0x0a) /* umul */ -#define DIV F3(2, 0x0e) /* udiv */ -#define SLL F3(2, 0x25) -#define SRL F3(2, 0x26) -#define JMPL F3(2, 0x38) -#define CALL F1(1) -#define BR F2(0, 0x01) -#define RD_Y F3(2, 0x28) -#define WR_Y F3(2, 0x30) - -#define LD32 F3(3, 0x00) -#define LD8 F3(3, 0x01) -#define LD16 F3(3, 0x02) -#define LD64 F3(3, 0x0b) -#define ST32 F3(3, 0x04) - -#ifdef CONFIG_SPARC64 -#define LDPTR LD64 -#define BASE_STACKFRAME 176 -#else -#define LDPTR LD32 -#define BASE_STACKFRAME 96 -#endif - -#define LD32I (LD32 | IMMED) -#define LD8I (LD8 | IMMED) -#define LD16I (LD16 | IMMED) -#define LD64I (LD64 | IMMED) -#define LDPTRI (LDPTR | IMMED) -#define ST32I (ST32 | IMMED) - -#define emit_nop() \ -do { \ - *prog++ = SETHI(0, G0); \ -} while (0) - -#define emit_neg() \ -do { /* sub %g0, r_A, r_A */ \ - *prog++ = SUB | RS1(G0) | RS2(r_A) | RD(r_A); \ -} while (0) - -#define emit_reg_move(FROM, TO) \ -do { /* or %g0, FROM, TO */ \ - *prog++ = OR | RS1(G0) | RS2(FROM) | RD(TO); \ -} while (0) - -#define emit_clear(REG) \ -do { /* or %g0, %g0, REG */ \ - *prog++ = OR | RS1(G0) | RS2(G0) | RD(REG); \ -} while (0) - -#define emit_set_const(K, REG) \ -do { /* sethi %hi(K), REG */ \ - *prog++ = SETHI(K, REG); \ - /* or REG, %lo(K), REG */ \ - *prog++ = OR_LO(K, REG); \ -} while (0) - - /* Emit - * - * OP r_A, r_X, r_A - */ -#define emit_alu_X(OPCODE) \ -do { \ - seen |= SEEN_XREG; \ - *prog++ = OPCODE | RS1(r_A) | RS2(r_X) | RD(r_A); \ -} while (0) - - /* Emit either: - * - * OP r_A, K, r_A - * - * or - * - * sethi %hi(K), r_TMP - * or r_TMP, %lo(K), r_TMP - * OP r_A, r_TMP, r_A - * - * depending upon whether K fits in a signed 13-bit - * immediate instruction field. Emit nothing if K - * is zero. - */ -#define emit_alu_K(OPCODE, K) \ -do { \ - if (K || OPCODE == AND || OPCODE == MUL) { \ - unsigned int _insn = OPCODE; \ - _insn |= RS1(r_A) | RD(r_A); \ - if (is_simm13(K)) { \ - *prog++ = _insn | IMMED | S13(K); \ - } else { \ - emit_set_const(K, r_TMP); \ - *prog++ = _insn | RS2(r_TMP); \ - } \ - } \ -} while (0) - -#define emit_loadimm(K, DEST) \ -do { \ - if (is_simm13(K)) { \ - /* or %g0, K, DEST */ \ - *prog++ = OR | IMMED | RS1(G0) | S13(K) | RD(DEST); \ - } else { \ - emit_set_const(K, DEST); \ - } \ -} while (0) - -#define emit_loadptr(BASE, STRUCT, FIELD, DEST) \ -do { unsigned int _off = offsetof(STRUCT, FIELD); \ - BUILD_BUG_ON(FIELD_SIZEOF(STRUCT, FIELD) != sizeof(void *)); \ - *prog++ = LDPTRI | RS1(BASE) | S13(_off) | RD(DEST); \ -} while (0) - -#define emit_load32(BASE, STRUCT, FIELD, DEST) \ -do { unsigned int _off = offsetof(STRUCT, FIELD); \ - BUILD_BUG_ON(FIELD_SIZEOF(STRUCT, FIELD) != sizeof(u32)); \ - *prog++ = LD32I | RS1(BASE) | S13(_off) | RD(DEST); \ -} while (0) - -#define emit_load16(BASE, STRUCT, FIELD, DEST) \ -do { unsigned int _off = offsetof(STRUCT, FIELD); \ - BUILD_BUG_ON(FIELD_SIZEOF(STRUCT, FIELD) != sizeof(u16)); \ - *prog++ = LD16I | RS1(BASE) | S13(_off) | RD(DEST); \ -} while (0) - -#define __emit_load8(BASE, STRUCT, FIELD, DEST) \ -do { unsigned int _off = offsetof(STRUCT, FIELD); \ - *prog++ = LD8I | RS1(BASE) | S13(_off) | RD(DEST); \ -} while (0) - -#define emit_load8(BASE, STRUCT, FIELD, DEST) \ -do { BUILD_BUG_ON(FIELD_SIZEOF(STRUCT, FIELD) != sizeof(u8)); \ - __emit_load8(BASE, STRUCT, FIELD, DEST); \ -} while (0) - -#ifdef CONFIG_SPARC64 -#define BIAS (STACK_BIAS - 4) -#else -#define BIAS (-4) -#endif - -#define emit_ldmem(OFF, DEST) \ -do { *prog++ = LD32I | RS1(SP) | S13(BIAS - (OFF)) | RD(DEST); \ -} while (0) - -#define emit_stmem(OFF, SRC) \ -do { *prog++ = ST32I | RS1(SP) | S13(BIAS - (OFF)) | RD(SRC); \ -} while (0) - -#ifdef CONFIG_SMP -#ifdef CONFIG_SPARC64 -#define emit_load_cpu(REG) \ - emit_load16(G6, struct thread_info, cpu, REG) -#else -#define emit_load_cpu(REG) \ - emit_load32(G6, struct thread_info, cpu, REG) -#endif -#else -#define emit_load_cpu(REG) emit_clear(REG) -#endif - -#define emit_skb_loadptr(FIELD, DEST) \ - emit_loadptr(r_SKB, struct sk_buff, FIELD, DEST) -#define emit_skb_load32(FIELD, DEST) \ - emit_load32(r_SKB, struct sk_buff, FIELD, DEST) -#define emit_skb_load16(FIELD, DEST) \ - emit_load16(r_SKB, struct sk_buff, FIELD, DEST) -#define __emit_skb_load8(FIELD, DEST) \ - __emit_load8(r_SKB, struct sk_buff, FIELD, DEST) -#define emit_skb_load8(FIELD, DEST) \ - emit_load8(r_SKB, struct sk_buff, FIELD, DEST) - -#define emit_jmpl(BASE, IMM_OFF, LREG) \ - *prog++ = (JMPL | IMMED | RS1(BASE) | S13(IMM_OFF) | RD(LREG)) - -#define emit_call(FUNC) \ -do { void *_here = image + addrs[i] - 8; \ - unsigned int _off = (void *)(FUNC) - _here; \ - *prog++ = CALL | (((_off) >> 2) & 0x3fffffff); \ - emit_nop(); \ -} while (0) - -#define emit_branch(BR_OPC, DEST) \ -do { unsigned int _here = addrs[i] - 8; \ - *prog++ = BR_OPC | WDISP22((DEST) - _here); \ -} while (0) - -#define emit_branch_off(BR_OPC, OFF) \ -do { *prog++ = BR_OPC | WDISP22(OFF); \ -} while (0) - -#define emit_jump(DEST) emit_branch(BA, DEST) - -#define emit_read_y(REG) *prog++ = RD_Y | RD(REG) -#define emit_write_y(REG) *prog++ = WR_Y | IMMED | RS1(REG) | S13(0) - -#define emit_cmp(R1, R2) \ - *prog++ = (SUBCC | RS1(R1) | RS2(R2) | RD(G0)) - -#define emit_cmpi(R1, IMM) \ - *prog++ = (SUBCC | IMMED | RS1(R1) | S13(IMM) | RD(G0)); - -#define emit_btst(R1, R2) \ - *prog++ = (ANDCC | RS1(R1) | RS2(R2) | RD(G0)) - -#define emit_btsti(R1, IMM) \ - *prog++ = (ANDCC | IMMED | RS1(R1) | S13(IMM) | RD(G0)); - -#define emit_sub(R1, R2, R3) \ - *prog++ = (SUB | RS1(R1) | RS2(R2) | RD(R3)) - -#define emit_subi(R1, IMM, R3) \ - *prog++ = (SUB | IMMED | RS1(R1) | S13(IMM) | RD(R3)) - -#define emit_add(R1, R2, R3) \ - *prog++ = (ADD | RS1(R1) | RS2(R2) | RD(R3)) - -#define emit_addi(R1, IMM, R3) \ - *prog++ = (ADD | IMMED | RS1(R1) | S13(IMM) | RD(R3)) - -#define emit_and(R1, R2, R3) \ - *prog++ = (AND | RS1(R1) | RS2(R2) | RD(R3)) - -#define emit_andi(R1, IMM, R3) \ - *prog++ = (AND | IMMED | RS1(R1) | S13(IMM) | RD(R3)) - -#define emit_alloc_stack(SZ) \ - *prog++ = (SUB | IMMED | RS1(SP) | S13(SZ) | RD(SP)) - -#define emit_release_stack(SZ) \ - *prog++ = (ADD | IMMED | RS1(SP) | S13(SZ) | RD(SP)) - -/* A note about branch offset calculations. The addrs[] array, - * indexed by BPF instruction, records the address after all the - * sparc instructions emitted for that BPF instruction. - * - * The most common case is to emit a branch at the end of such - * a code sequence. So this would be two instructions, the - * branch and it's delay slot. - * - * Therefore by default the branch emitters calculate the branch - * offset field as: - * - * destination - (addrs[i] - 8) - * - * This "addrs[i] - 8" is the address of the branch itself or - * what "." would be in assembler notation. The "8" part is - * how we take into consideration the branch and it's delay - * slot mentioned above. - * - * Sometimes we need to emit a branch earlier in the code - * sequence. And in these situations we adjust "destination" - * to accommodate this difference. For example, if we needed - * to emit a branch (and it's delay slot) right before the - * final instruction emitted for a BPF opcode, we'd use - * "destination + 4" instead of just plain "destination" above. - * - * This is why you see all of these funny emit_branch() and - * emit_jump() calls with adjusted offsets. - */ - -void bpf_jit_compile(struct bpf_prog *fp) -{ - unsigned int cleanup_addr, proglen, oldproglen = 0; - u32 temp[8], *prog, *func, seen = 0, pass; - const struct sock_filter *filter = fp->insns; - int i, flen = fp->len, pc_ret0 = -1; - unsigned int *addrs; - void *image; - - if (!bpf_jit_enable) - return; - - addrs = kmalloc(flen * sizeof(*addrs), GFP_KERNEL); - if (addrs == NULL) - return; - - /* Before first pass, make a rough estimation of addrs[] - * each bpf instruction is translated to less than 64 bytes - */ - for (proglen = 0, i = 0; i < flen; i++) { - proglen += 64; - addrs[i] = proglen; - } - cleanup_addr = proglen; /* epilogue address */ - image = NULL; - for (pass = 0; pass < 10; pass++) { - u8 seen_or_pass0 = (pass == 0) ? (SEEN_XREG | SEEN_DATAREF | SEEN_MEM) : seen; - - /* no prologue/epilogue for trivial filters (RET something) */ - proglen = 0; - prog = temp; - - /* Prologue */ - if (seen_or_pass0) { - if (seen_or_pass0 & SEEN_MEM) { - unsigned int sz = BASE_STACKFRAME; - sz += BPF_MEMWORDS * sizeof(u32); - emit_alloc_stack(sz); - } - - /* Make sure we dont leek kernel memory. */ - if (seen_or_pass0 & SEEN_XREG) - emit_clear(r_X); - - /* If this filter needs to access skb data, - * load %o4 and %o5 with: - * %o4 = skb->len - skb->data_len - * %o5 = skb->data - * And also back up %o7 into r_saved_O7 so we can - * invoke the stubs using 'call'. - */ - if (seen_or_pass0 & SEEN_DATAREF) { - emit_load32(r_SKB, struct sk_buff, len, r_HEADLEN); - emit_load32(r_SKB, struct sk_buff, data_len, r_TMP); - emit_sub(r_HEADLEN, r_TMP, r_HEADLEN); - emit_loadptr(r_SKB, struct sk_buff, data, r_SKB_DATA); - } - } - emit_reg_move(O7, r_saved_O7); - - /* Make sure we dont leak kernel information to the user. */ - if (bpf_needs_clear_a(&filter[0])) - emit_clear(r_A); /* A = 0 */ - - for (i = 0; i < flen; i++) { - unsigned int K = filter[i].k; - unsigned int t_offset; - unsigned int f_offset; - u32 t_op, f_op; - u16 code = bpf_anc_helper(&filter[i]); - int ilen; - - switch (code) { - case BPF_ALU | BPF_ADD | BPF_X: /* A += X; */ - emit_alu_X(ADD); - break; - case BPF_ALU | BPF_ADD | BPF_K: /* A += K; */ - emit_alu_K(ADD, K); - break; - case BPF_ALU | BPF_SUB | BPF_X: /* A -= X; */ - emit_alu_X(SUB); - break; - case BPF_ALU | BPF_SUB | BPF_K: /* A -= K */ - emit_alu_K(SUB, K); - break; - case BPF_ALU | BPF_AND | BPF_X: /* A &= X */ - emit_alu_X(AND); - break; - case BPF_ALU | BPF_AND | BPF_K: /* A &= K */ - emit_alu_K(AND, K); - break; - case BPF_ALU | BPF_OR | BPF_X: /* A |= X */ - emit_alu_X(OR); - break; - case BPF_ALU | BPF_OR | BPF_K: /* A |= K */ - emit_alu_K(OR, K); - break; - case BPF_ANC | SKF_AD_ALU_XOR_X: /* A ^= X; */ - case BPF_ALU | BPF_XOR | BPF_X: - emit_alu_X(XOR); - break; - case BPF_ALU | BPF_XOR | BPF_K: /* A ^= K */ - emit_alu_K(XOR, K); - break; - case BPF_ALU | BPF_LSH | BPF_X: /* A <<= X */ - emit_alu_X(SLL); - break; - case BPF_ALU | BPF_LSH | BPF_K: /* A <<= K */ - emit_alu_K(SLL, K); - break; - case BPF_ALU | BPF_RSH | BPF_X: /* A >>= X */ - emit_alu_X(SRL); - break; - case BPF_ALU | BPF_RSH | BPF_K: /* A >>= K */ - emit_alu_K(SRL, K); - break; - case BPF_ALU | BPF_MUL | BPF_X: /* A *= X; */ - emit_alu_X(MUL); - break; - case BPF_ALU | BPF_MUL | BPF_K: /* A *= K */ - emit_alu_K(MUL, K); - break; - case BPF_ALU | BPF_DIV | BPF_K: /* A /= K with K != 0*/ - if (K == 1) - break; - emit_write_y(G0); -#ifdef CONFIG_SPARC32 - /* The Sparc v8 architecture requires - * three instructions between a %y - * register write and the first use. - */ - emit_nop(); - emit_nop(); - emit_nop(); -#endif - emit_alu_K(DIV, K); - break; - case BPF_ALU | BPF_DIV | BPF_X: /* A /= X; */ - emit_cmpi(r_X, 0); - if (pc_ret0 > 0) { - t_offset = addrs[pc_ret0 - 1]; -#ifdef CONFIG_SPARC32 - emit_branch(BE, t_offset + 20); -#else - emit_branch(BE, t_offset + 8); -#endif - emit_nop(); /* delay slot */ - } else { - emit_branch_off(BNE, 16); - emit_nop(); -#ifdef CONFIG_SPARC32 - emit_jump(cleanup_addr + 20); -#else - emit_jump(cleanup_addr + 8); -#endif - emit_clear(r_A); - } - emit_write_y(G0); -#ifdef CONFIG_SPARC32 - /* The Sparc v8 architecture requires - * three instructions between a %y - * register write and the first use. - */ - emit_nop(); - emit_nop(); - emit_nop(); -#endif - emit_alu_X(DIV); - break; - case BPF_ALU | BPF_NEG: - emit_neg(); - break; - case BPF_RET | BPF_K: - if (!K) { - if (pc_ret0 == -1) - pc_ret0 = i; - emit_clear(r_A); - } else { - emit_loadimm(K, r_A); - } - /* Fallthrough */ - case BPF_RET | BPF_A: - if (seen_or_pass0) { - if (i != flen - 1) { - emit_jump(cleanup_addr); - emit_nop(); - break; - } - if (seen_or_pass0 & SEEN_MEM) { - unsigned int sz = BASE_STACKFRAME; - sz += BPF_MEMWORDS * sizeof(u32); - emit_release_stack(sz); - } - } - /* jmpl %r_saved_O7 + 8, %g0 */ - emit_jmpl(r_saved_O7, 8, G0); - emit_reg_move(r_A, O0); /* delay slot */ - break; - case BPF_MISC | BPF_TAX: - seen |= SEEN_XREG; - emit_reg_move(r_A, r_X); - break; - case BPF_MISC | BPF_TXA: - seen |= SEEN_XREG; - emit_reg_move(r_X, r_A); - break; - case BPF_ANC | SKF_AD_CPU: - emit_load_cpu(r_A); - break; - case BPF_ANC | SKF_AD_PROTOCOL: - emit_skb_load16(protocol, r_A); - break; - case BPF_ANC | SKF_AD_PKTTYPE: - __emit_skb_load8(__pkt_type_offset, r_A); - emit_andi(r_A, PKT_TYPE_MAX, r_A); - emit_alu_K(SRL, 5); - break; - case BPF_ANC | SKF_AD_IFINDEX: - emit_skb_loadptr(dev, r_A); - emit_cmpi(r_A, 0); - emit_branch(BE_PTR, cleanup_addr + 4); - emit_nop(); - emit_load32(r_A, struct net_device, ifindex, r_A); - break; - case BPF_ANC | SKF_AD_MARK: - emit_skb_load32(mark, r_A); - break; - case BPF_ANC | SKF_AD_QUEUE: - emit_skb_load16(queue_mapping, r_A); - break; - case BPF_ANC | SKF_AD_HATYPE: - emit_skb_loadptr(dev, r_A); - emit_cmpi(r_A, 0); - emit_branch(BE_PTR, cleanup_addr + 4); - emit_nop(); - emit_load16(r_A, struct net_device, type, r_A); - break; - case BPF_ANC | SKF_AD_RXHASH: - emit_skb_load32(hash, r_A); - break; - case BPF_ANC | SKF_AD_VLAN_TAG: - case BPF_ANC | SKF_AD_VLAN_TAG_PRESENT: - emit_skb_load16(vlan_tci, r_A); - if (code != (BPF_ANC | SKF_AD_VLAN_TAG)) { - emit_alu_K(SRL, 12); - emit_andi(r_A, 1, r_A); - } else { - emit_loadimm(~VLAN_TAG_PRESENT, r_TMP); - emit_and(r_A, r_TMP, r_A); - } - break; - case BPF_LD | BPF_W | BPF_LEN: - emit_skb_load32(len, r_A); - break; - case BPF_LDX | BPF_W | BPF_LEN: - emit_skb_load32(len, r_X); - break; - case BPF_LD | BPF_IMM: - emit_loadimm(K, r_A); - break; - case BPF_LDX | BPF_IMM: - emit_loadimm(K, r_X); - break; - case BPF_LD | BPF_MEM: - seen |= SEEN_MEM; - emit_ldmem(K * 4, r_A); - break; - case BPF_LDX | BPF_MEM: - seen |= SEEN_MEM | SEEN_XREG; - emit_ldmem(K * 4, r_X); - break; - case BPF_ST: - seen |= SEEN_MEM; - emit_stmem(K * 4, r_A); - break; - case BPF_STX: - seen |= SEEN_MEM | SEEN_XREG; - emit_stmem(K * 4, r_X); - break; - -#define CHOOSE_LOAD_FUNC(K, func) \ - ((int)K < 0 ? ((int)K >= SKF_LL_OFF ? func##_negative_offset : func) : func##_positive_offset) - - case BPF_LD | BPF_W | BPF_ABS: - func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_word); -common_load: seen |= SEEN_DATAREF; - emit_loadimm(K, r_OFF); - emit_call(func); - break; - case BPF_LD | BPF_H | BPF_ABS: - func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_half); - goto common_load; - case BPF_LD | BPF_B | BPF_ABS: - func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_byte); - goto common_load; - case BPF_LDX | BPF_B | BPF_MSH: - func = CHOOSE_LOAD_FUNC(K, bpf_jit_load_byte_msh); - goto common_load; - case BPF_LD | BPF_W | BPF_IND: - func = bpf_jit_load_word; -common_load_ind: seen |= SEEN_DATAREF | SEEN_XREG; - if (K) { - if (is_simm13(K)) { - emit_addi(r_X, K, r_OFF); - } else { - emit_loadimm(K, r_TMP); - emit_add(r_X, r_TMP, r_OFF); - } - } else { - emit_reg_move(r_X, r_OFF); - } - emit_call(func); - break; - case BPF_LD | BPF_H | BPF_IND: - func = bpf_jit_load_half; - goto common_load_ind; - case BPF_LD | BPF_B | BPF_IND: - func = bpf_jit_load_byte; - goto common_load_ind; - case BPF_JMP | BPF_JA: - emit_jump(addrs[i + K]); - emit_nop(); - break; - -#define COND_SEL(CODE, TOP, FOP) \ - case CODE: \ - t_op = TOP; \ - f_op = FOP; \ - goto cond_branch - - COND_SEL(BPF_JMP | BPF_JGT | BPF_K, BGU, BLEU); - COND_SEL(BPF_JMP | BPF_JGE | BPF_K, BGEU, BLU); - COND_SEL(BPF_JMP | BPF_JEQ | BPF_K, BE, BNE); - COND_SEL(BPF_JMP | BPF_JSET | BPF_K, BNE, BE); - COND_SEL(BPF_JMP | BPF_JGT | BPF_X, BGU, BLEU); - COND_SEL(BPF_JMP | BPF_JGE | BPF_X, BGEU, BLU); - COND_SEL(BPF_JMP | BPF_JEQ | BPF_X, BE, BNE); - COND_SEL(BPF_JMP | BPF_JSET | BPF_X, BNE, BE); - -cond_branch: f_offset = addrs[i + filter[i].jf]; - t_offset = addrs[i + filter[i].jt]; - - /* same targets, can avoid doing the test :) */ - if (filter[i].jt == filter[i].jf) { - emit_jump(t_offset); - emit_nop(); - break; - } - - switch (code) { - case BPF_JMP | BPF_JGT | BPF_X: - case BPF_JMP | BPF_JGE | BPF_X: - case BPF_JMP | BPF_JEQ | BPF_X: - seen |= SEEN_XREG; - emit_cmp(r_A, r_X); - break; - case BPF_JMP | BPF_JSET | BPF_X: - seen |= SEEN_XREG; - emit_btst(r_A, r_X); - break; - case BPF_JMP | BPF_JEQ | BPF_K: - case BPF_JMP | BPF_JGT | BPF_K: - case BPF_JMP | BPF_JGE | BPF_K: - if (is_simm13(K)) { - emit_cmpi(r_A, K); - } else { - emit_loadimm(K, r_TMP); - emit_cmp(r_A, r_TMP); - } - break; - case BPF_JMP | BPF_JSET | BPF_K: - if (is_simm13(K)) { - emit_btsti(r_A, K); - } else { - emit_loadimm(K, r_TMP); - emit_btst(r_A, r_TMP); - } - break; - } - if (filter[i].jt != 0) { - if (filter[i].jf) - t_offset += 8; - emit_branch(t_op, t_offset); - emit_nop(); /* delay slot */ - if (filter[i].jf) { - emit_jump(f_offset); - emit_nop(); - } - break; - } - emit_branch(f_op, f_offset); - emit_nop(); /* delay slot */ - break; - - default: - /* hmm, too complex filter, give up with jit compiler */ - goto out; - } - ilen = (void *) prog - (void *) temp; - if (image) { - if (unlikely(proglen + ilen > oldproglen)) { - pr_err("bpb_jit_compile fatal error\n"); - kfree(addrs); - module_memfree(image); - return; - } - memcpy(image + proglen, temp, ilen); - } - proglen += ilen; - addrs[i] = proglen; - prog = temp; - } - /* last bpf instruction is always a RET : - * use it to give the cleanup instruction(s) addr - */ - cleanup_addr = proglen - 8; /* jmpl; mov r_A,%o0; */ - if (seen_or_pass0 & SEEN_MEM) - cleanup_addr -= 4; /* add %sp, X, %sp; */ - - if (image) { - if (proglen != oldproglen) - pr_err("bpb_jit_compile proglen=%u != oldproglen=%u\n", - proglen, oldproglen); - break; - } - if (proglen == oldproglen) { - image = module_alloc(proglen); - if (!image) - goto out; - } - oldproglen = proglen; - } - - if (bpf_jit_enable > 1) - bpf_jit_dump(flen, proglen, pass + 1, image); - - if (image) { - bpf_flush_icache(image, image + proglen); - fp->bpf_func = (void *)image; - fp->jited = 1; - } -out: - kfree(addrs); - return; -} - -void bpf_jit_free(struct bpf_prog *fp) -{ - if (fp->jited) - module_memfree(fp->bpf_func); - - bpf_prog_unlock_free(fp); -} |