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ARM: net: bpf: use negative numbers for stacked registers
Use negative numbers for eBPF registers that live on the stack. Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Russell King
Daniel Borkmann
parent
a8ef95a034
commit
1c35ba122d
@ -101,7 +101,11 @@ enum {
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BPF_JIT_SCRATCH_REGS,
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};
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#define STACK_OFFSET(k) ((k) * 4)
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/*
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* Negative "register" values indicate the register is stored on the stack
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* and are the offset from the top of the eBPF JIT scratch space.
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*/
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#define STACK_OFFSET(k) (-4 - (k) * 4)
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#define SCRATCH_SIZE (BPF_JIT_SCRATCH_REGS * 4)
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#define TMP_REG_1 (MAX_BPF_JIT_REG + 0) /* TEMP Register 1 */
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@ -125,7 +129,7 @@ enum {
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* scratch memory space and we have to build eBPF 64 bit register from those.
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*
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*/
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static const u8 bpf2a32[][2] = {
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static const s8 bpf2a32[][2] = {
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/* return value from in-kernel function, and exit value from eBPF */
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[BPF_REG_0] = {ARM_R1, ARM_R0},
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/* arguments from eBPF program to in-kernel function */
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@ -291,7 +295,7 @@ static void jit_fill_hole(void *area, unsigned int size)
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#define STACK_SIZE ALIGN(_STACK_SIZE, STACK_ALIGNMENT)
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/* Get the offset of eBPF REGISTERs stored on scratch space. */
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#define STACK_VAR(off) (STACK_SIZE - off)
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#define STACK_VAR(off) (STACK_SIZE + (off))
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#if __LINUX_ARM_ARCH__ < 7
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@ -408,7 +412,7 @@ static inline int epilogue_offset(const struct jit_ctx *ctx)
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static inline void emit_udivmod(u8 rd, u8 rm, u8 rn, struct jit_ctx *ctx, u8 op)
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{
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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#if __LINUX_ARM_ARCH__ == 7
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if (elf_hwcap & HWCAP_IDIVA) {
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@ -470,10 +474,10 @@ static inline bool is_on_stack(u8 bpf_reg)
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return false;
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}
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static inline void emit_a32_mov_i(const u8 dst, const u32 val,
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static inline void emit_a32_mov_i(const s8 dst, const u32 val,
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bool dstk, struct jit_ctx *ctx)
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{
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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if (dstk) {
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emit_mov_i(tmp[1], val, ctx);
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@ -484,7 +488,7 @@ static inline void emit_a32_mov_i(const u8 dst, const u32 val,
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}
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/* Sign extended move */
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static inline void emit_a32_mov_i64(const bool is64, const u8 dst[],
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static inline void emit_a32_mov_i64(const bool is64, const s8 dst[],
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const u32 val, bool dstk,
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struct jit_ctx *ctx) {
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u32 hi = 0;
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@ -574,12 +578,12 @@ static inline void emit_alu_r(const u8 dst, const u8 src, const bool is64,
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/* ALU operation (32 bit)
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* dst = dst (op) src
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*/
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static inline void emit_a32_alu_r(const u8 dst, const u8 src,
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static inline void emit_a32_alu_r(const s8 dst, const s8 src,
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bool dstk, bool sstk,
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struct jit_ctx *ctx, const bool is64,
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const bool hi, const u8 op) {
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const u8 *tmp = bpf2a32[TMP_REG_1];
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u8 rn = sstk ? tmp[1] : src;
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const s8 *tmp = bpf2a32[TMP_REG_1];
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s8 rn = sstk ? tmp[1] : src;
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if (sstk)
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emit(ARM_LDR_I(rn, ARM_SP, STACK_VAR(src)), ctx);
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@ -595,8 +599,8 @@ static inline void emit_a32_alu_r(const u8 dst, const u8 src,
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}
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/* ALU operation (64 bit) */
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static inline void emit_a32_alu_r64(const bool is64, const u8 dst[],
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const u8 src[], bool dstk,
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static inline void emit_a32_alu_r64(const bool is64, const s8 dst[],
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const s8 src[], bool dstk,
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bool sstk, struct jit_ctx *ctx,
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const u8 op) {
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emit_a32_alu_r(dst_lo, src_lo, dstk, sstk, ctx, is64, false, op);
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@ -607,11 +611,11 @@ static inline void emit_a32_alu_r64(const bool is64, const u8 dst[],
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}
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/* dst = imm (4 bytes)*/
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static inline void emit_a32_mov_r(const u8 dst, const u8 src,
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static inline void emit_a32_mov_r(const s8 dst, const s8 src,
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bool dstk, bool sstk,
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struct jit_ctx *ctx) {
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const u8 *tmp = bpf2a32[TMP_REG_1];
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u8 rt = sstk ? tmp[0] : src;
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const s8 *tmp = bpf2a32[TMP_REG_1];
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s8 rt = sstk ? tmp[0] : src;
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if (sstk)
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emit(ARM_LDR_I(tmp[0], ARM_SP, STACK_VAR(src)), ctx);
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@ -622,8 +626,8 @@ static inline void emit_a32_mov_r(const u8 dst, const u8 src,
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}
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/* dst = src */
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static inline void emit_a32_mov_r64(const bool is64, const u8 dst[],
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const u8 src[], bool dstk,
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static inline void emit_a32_mov_r64(const bool is64, const s8 dst[],
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const s8 src[], bool dstk,
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bool sstk, struct jit_ctx *ctx) {
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emit_a32_mov_r(dst_lo, src_lo, dstk, sstk, ctx);
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if (is64) {
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@ -636,10 +640,10 @@ static inline void emit_a32_mov_r64(const bool is64, const u8 dst[],
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}
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/* Shift operations */
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static inline void emit_a32_alu_i(const u8 dst, const u32 val, bool dstk,
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static inline void emit_a32_alu_i(const s8 dst, const u32 val, bool dstk,
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struct jit_ctx *ctx, const u8 op) {
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const u8 *tmp = bpf2a32[TMP_REG_1];
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u8 rd = dstk ? tmp[0] : dst;
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const s8 *tmp = bpf2a32[TMP_REG_1];
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s8 rd = dstk ? tmp[0] : dst;
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if (dstk)
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emit(ARM_LDR_I(rd, ARM_SP, STACK_VAR(dst)), ctx);
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@ -662,11 +666,11 @@ static inline void emit_a32_alu_i(const u8 dst, const u32 val, bool dstk,
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}
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/* dst = ~dst (64 bit) */
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static inline void emit_a32_neg64(const u8 dst[], bool dstk,
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static inline void emit_a32_neg64(const s8 dst[], bool dstk,
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struct jit_ctx *ctx){
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const u8 *tmp = bpf2a32[TMP_REG_1];
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u8 rd = dstk ? tmp[1] : dst[1];
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u8 rm = dstk ? tmp[0] : dst[0];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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s8 rd = dstk ? tmp[1] : dst[1];
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s8 rm = dstk ? tmp[0] : dst[0];
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/* Setup Operand */
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if (dstk) {
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@ -685,15 +689,15 @@ static inline void emit_a32_neg64(const u8 dst[], bool dstk,
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}
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/* dst = dst << src */
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static inline void emit_a32_lsh_r64(const u8 dst[], const u8 src[], bool dstk,
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static inline void emit_a32_lsh_r64(const s8 dst[], const s8 src[], bool dstk,
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bool sstk, struct jit_ctx *ctx) {
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const u8 *tmp2 = bpf2a32[TMP_REG_2];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *tmp2 = bpf2a32[TMP_REG_2];
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/* Setup Operands */
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u8 rt = sstk ? tmp2[1] : src_lo;
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u8 rd = dstk ? tmp[1] : dst_lo;
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u8 rm = dstk ? tmp[0] : dst_hi;
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s8 rt = sstk ? tmp2[1] : src_lo;
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s8 rd = dstk ? tmp[1] : dst_lo;
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s8 rm = dstk ? tmp[0] : dst_hi;
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if (sstk)
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emit(ARM_LDR_I(rt, ARM_SP, STACK_VAR(src_lo)), ctx);
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@ -720,14 +724,14 @@ static inline void emit_a32_lsh_r64(const u8 dst[], const u8 src[], bool dstk,
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}
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/* dst = dst >> src (signed)*/
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static inline void emit_a32_arsh_r64(const u8 dst[], const u8 src[], bool dstk,
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static inline void emit_a32_arsh_r64(const s8 dst[], const s8 src[], bool dstk,
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bool sstk, struct jit_ctx *ctx) {
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const u8 *tmp2 = bpf2a32[TMP_REG_2];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *tmp2 = bpf2a32[TMP_REG_2];
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/* Setup Operands */
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u8 rt = sstk ? tmp2[1] : src_lo;
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u8 rd = dstk ? tmp[1] : dst_lo;
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u8 rm = dstk ? tmp[0] : dst_hi;
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s8 rt = sstk ? tmp2[1] : src_lo;
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s8 rd = dstk ? tmp[1] : dst_lo;
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s8 rm = dstk ? tmp[0] : dst_hi;
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if (sstk)
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emit(ARM_LDR_I(rt, ARM_SP, STACK_VAR(src_lo)), ctx);
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@ -754,14 +758,14 @@ static inline void emit_a32_arsh_r64(const u8 dst[], const u8 src[], bool dstk,
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}
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/* dst = dst >> src */
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static inline void emit_a32_rsh_r64(const u8 dst[], const u8 src[], bool dstk,
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static inline void emit_a32_rsh_r64(const s8 dst[], const s8 src[], bool dstk,
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bool sstk, struct jit_ctx *ctx) {
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const u8 *tmp2 = bpf2a32[TMP_REG_2];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *tmp2 = bpf2a32[TMP_REG_2];
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/* Setup Operands */
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u8 rt = sstk ? tmp2[1] : src_lo;
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u8 rd = dstk ? tmp[1] : dst_lo;
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u8 rm = dstk ? tmp[0] : dst_hi;
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s8 rt = sstk ? tmp2[1] : src_lo;
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s8 rd = dstk ? tmp[1] : dst_lo;
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s8 rm = dstk ? tmp[0] : dst_hi;
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if (sstk)
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emit(ARM_LDR_I(rt, ARM_SP, STACK_VAR(src_lo)), ctx);
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@ -787,13 +791,13 @@ static inline void emit_a32_rsh_r64(const u8 dst[], const u8 src[], bool dstk,
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}
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/* dst = dst << val */
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static inline void emit_a32_lsh_i64(const u8 dst[], bool dstk,
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static inline void emit_a32_lsh_i64(const s8 dst[], bool dstk,
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const u32 val, struct jit_ctx *ctx){
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const u8 *tmp2 = bpf2a32[TMP_REG_2];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *tmp2 = bpf2a32[TMP_REG_2];
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/* Setup operands */
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u8 rd = dstk ? tmp[1] : dst_lo;
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u8 rm = dstk ? tmp[0] : dst_hi;
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s8 rd = dstk ? tmp[1] : dst_lo;
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s8 rm = dstk ? tmp[0] : dst_hi;
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if (dstk) {
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emit(ARM_LDR_I(rd, ARM_SP, STACK_VAR(dst_lo)), ctx);
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@ -820,13 +824,13 @@ static inline void emit_a32_lsh_i64(const u8 dst[], bool dstk,
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}
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/* dst = dst >> val */
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static inline void emit_a32_rsh_i64(const u8 dst[], bool dstk,
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static inline void emit_a32_rsh_i64(const s8 dst[], bool dstk,
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const u32 val, struct jit_ctx *ctx) {
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const u8 *tmp2 = bpf2a32[TMP_REG_2];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *tmp2 = bpf2a32[TMP_REG_2];
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/* Setup operands */
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u8 rd = dstk ? tmp[1] : dst_lo;
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u8 rm = dstk ? tmp[0] : dst_hi;
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s8 rd = dstk ? tmp[1] : dst_lo;
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s8 rm = dstk ? tmp[0] : dst_hi;
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if (dstk) {
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emit(ARM_LDR_I(rd, ARM_SP, STACK_VAR(dst_lo)), ctx);
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@ -853,13 +857,13 @@ static inline void emit_a32_rsh_i64(const u8 dst[], bool dstk,
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}
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/* dst = dst >> val (signed) */
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static inline void emit_a32_arsh_i64(const u8 dst[], bool dstk,
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static inline void emit_a32_arsh_i64(const s8 dst[], bool dstk,
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const u32 val, struct jit_ctx *ctx){
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const u8 *tmp2 = bpf2a32[TMP_REG_2];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *tmp2 = bpf2a32[TMP_REG_2];
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/* Setup operands */
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u8 rd = dstk ? tmp[1] : dst_lo;
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u8 rm = dstk ? tmp[0] : dst_hi;
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s8 rd = dstk ? tmp[1] : dst_lo;
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s8 rm = dstk ? tmp[0] : dst_hi;
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if (dstk) {
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emit(ARM_LDR_I(rd, ARM_SP, STACK_VAR(dst_lo)), ctx);
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@ -885,15 +889,15 @@ static inline void emit_a32_arsh_i64(const u8 dst[], bool dstk,
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}
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}
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static inline void emit_a32_mul_r64(const u8 dst[], const u8 src[], bool dstk,
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static inline void emit_a32_mul_r64(const s8 dst[], const s8 src[], bool dstk,
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bool sstk, struct jit_ctx *ctx) {
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const u8 *tmp2 = bpf2a32[TMP_REG_2];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *tmp2 = bpf2a32[TMP_REG_2];
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/* Setup operands for multiplication */
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u8 rd = dstk ? tmp[1] : dst_lo;
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u8 rm = dstk ? tmp[0] : dst_hi;
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u8 rt = sstk ? tmp2[1] : src_lo;
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u8 rn = sstk ? tmp2[0] : src_hi;
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s8 rd = dstk ? tmp[1] : dst_lo;
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s8 rm = dstk ? tmp[0] : dst_hi;
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s8 rt = sstk ? tmp2[1] : src_lo;
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s8 rn = sstk ? tmp2[0] : src_hi;
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if (dstk) {
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emit(ARM_LDR_I(rd, ARM_SP, STACK_VAR(dst_lo)), ctx);
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@ -920,10 +924,10 @@ static inline void emit_a32_mul_r64(const u8 dst[], const u8 src[], bool dstk,
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}
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/* *(size *)(dst + off) = src */
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static inline void emit_str_r(const u8 dst, const u8 src, bool dstk,
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static inline void emit_str_r(const s8 dst, const s8 src, bool dstk,
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const s32 off, struct jit_ctx *ctx, const u8 sz){
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const u8 *tmp = bpf2a32[TMP_REG_1];
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u8 rd = dstk ? tmp[1] : dst;
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const s8 *tmp = bpf2a32[TMP_REG_1];
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s8 rd = dstk ? tmp[1] : dst;
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if (dstk)
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emit(ARM_LDR_I(rd, ARM_SP, STACK_VAR(dst)), ctx);
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@ -949,11 +953,11 @@ static inline void emit_str_r(const u8 dst, const u8 src, bool dstk,
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}
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/* dst = *(size*)(src + off) */
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static inline void emit_ldx_r(const u8 dst[], const u8 src, bool dstk,
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static inline void emit_ldx_r(const s8 dst[], const s8 src, bool dstk,
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s32 off, struct jit_ctx *ctx, const u8 sz){
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const u8 *rd = dstk ? tmp : dst;
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u8 rm = src;
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const s8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *rd = dstk ? tmp : dst;
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s8 rm = src;
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s32 off_max;
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if (sz == BPF_H)
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@ -1034,11 +1038,11 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
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{
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/* bpf_tail_call(void *prog_ctx, struct bpf_array *array, u64 index) */
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const u8 *r2 = bpf2a32[BPF_REG_2];
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const u8 *r3 = bpf2a32[BPF_REG_3];
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const u8 *tmp = bpf2a32[TMP_REG_1];
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const u8 *tmp2 = bpf2a32[TMP_REG_2];
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const u8 *tcc = bpf2a32[TCALL_CNT];
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const s8 *r2 = bpf2a32[BPF_REG_2];
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const s8 *r3 = bpf2a32[BPF_REG_3];
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const s8 *tmp = bpf2a32[TMP_REG_1];
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const s8 *tmp2 = bpf2a32[TMP_REG_2];
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const s8 *tcc = bpf2a32[TCALL_CNT];
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const int idx0 = ctx->idx;
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#define cur_offset (ctx->idx - idx0)
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#define jmp_offset (out_offset - (cur_offset) - 2)
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@ -1112,7 +1116,7 @@ static int emit_bpf_tail_call(struct jit_ctx *ctx)
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static inline void emit_rev16(const u8 rd, const u8 rn, struct jit_ctx *ctx)
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{
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#if __LINUX_ARM_ARCH__ < 6
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const u8 *tmp2 = bpf2a32[TMP_REG_2];
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const s8 *tmp2 = bpf2a32[TMP_REG_2];
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emit(ARM_AND_I(tmp2[1], rn, 0xff), ctx);
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emit(ARM_MOV_SI(tmp2[0], rn, SRTYPE_LSR, 8), ctx);
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@ -1127,7 +1131,7 @@ static inline void emit_rev16(const u8 rd, const u8 rn, struct jit_ctx *ctx)
|
||||
static inline void emit_rev32(const u8 rd, const u8 rn, struct jit_ctx *ctx)
|
||||
{
|
||||
#if __LINUX_ARM_ARCH__ < 6
|
||||
const u8 *tmp2 = bpf2a32[TMP_REG_2];
|
||||
const s8 *tmp2 = bpf2a32[TMP_REG_2];
|
||||
|
||||
emit(ARM_AND_I(tmp2[1], rn, 0xff), ctx);
|
||||
emit(ARM_MOV_SI(tmp2[0], rn, SRTYPE_LSR, 24), ctx);
|
||||
@ -1147,10 +1151,10 @@ static inline void emit_rev32(const u8 rd, const u8 rn, struct jit_ctx *ctx)
|
||||
}
|
||||
|
||||
// push the scratch stack register on top of the stack
|
||||
static inline void emit_push_r64(const u8 src[], const u8 shift,
|
||||
static inline void emit_push_r64(const s8 src[], const u8 shift,
|
||||
struct jit_ctx *ctx)
|
||||
{
|
||||
const u8 *tmp2 = bpf2a32[TMP_REG_2];
|
||||
const s8 *tmp2 = bpf2a32[TMP_REG_2];
|
||||
u16 reg_set = 0;
|
||||
|
||||
emit(ARM_LDR_I(tmp2[1], ARM_SP, STACK_VAR(src[1]+shift)), ctx);
|
||||
@ -1162,13 +1166,13 @@ static inline void emit_push_r64(const u8 src[], const u8 shift,
|
||||
|
||||
static void build_prologue(struct jit_ctx *ctx)
|
||||
{
|
||||
const u8 r0 = bpf2a32[BPF_REG_0][1];
|
||||
const u8 r2 = bpf2a32[BPF_REG_1][1];
|
||||
const u8 r3 = bpf2a32[BPF_REG_1][0];
|
||||
const u8 r4 = bpf2a32[BPF_REG_6][1];
|
||||
const u8 fplo = bpf2a32[BPF_REG_FP][1];
|
||||
const u8 fphi = bpf2a32[BPF_REG_FP][0];
|
||||
const u8 *tcc = bpf2a32[TCALL_CNT];
|
||||
const s8 r0 = bpf2a32[BPF_REG_0][1];
|
||||
const s8 r2 = bpf2a32[BPF_REG_1][1];
|
||||
const s8 r3 = bpf2a32[BPF_REG_1][0];
|
||||
const s8 r4 = bpf2a32[BPF_REG_6][1];
|
||||
const s8 fplo = bpf2a32[BPF_REG_FP][1];
|
||||
const s8 fphi = bpf2a32[BPF_REG_FP][0];
|
||||
const s8 *tcc = bpf2a32[TCALL_CNT];
|
||||
|
||||
/* Save callee saved registers. */
|
||||
#ifdef CONFIG_FRAME_POINTER
|
||||
@ -1231,17 +1235,17 @@ static void build_epilogue(struct jit_ctx *ctx)
|
||||
static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx)
|
||||
{
|
||||
const u8 code = insn->code;
|
||||
const u8 *dst = bpf2a32[insn->dst_reg];
|
||||
const u8 *src = bpf2a32[insn->src_reg];
|
||||
const u8 *tmp = bpf2a32[TMP_REG_1];
|
||||
const u8 *tmp2 = bpf2a32[TMP_REG_2];
|
||||
const s8 *dst = bpf2a32[insn->dst_reg];
|
||||
const s8 *src = bpf2a32[insn->src_reg];
|
||||
const s8 *tmp = bpf2a32[TMP_REG_1];
|
||||
const s8 *tmp2 = bpf2a32[TMP_REG_2];
|
||||
const s16 off = insn->off;
|
||||
const s32 imm = insn->imm;
|
||||
const int i = insn - ctx->prog->insnsi;
|
||||
const bool is64 = BPF_CLASS(code) == BPF_ALU64;
|
||||
const bool dstk = is_on_stack(insn->dst_reg);
|
||||
const bool sstk = is_on_stack(insn->src_reg);
|
||||
u8 rd, rt, rm, rn;
|
||||
s8 rd, rt, rm, rn;
|
||||
s32 jmp_offset;
|
||||
|
||||
#define check_imm(bits, imm) do { \
|
||||
@ -1672,12 +1676,12 @@ go_jmp:
|
||||
/* function call */
|
||||
case BPF_JMP | BPF_CALL:
|
||||
{
|
||||
const u8 *r0 = bpf2a32[BPF_REG_0];
|
||||
const u8 *r1 = bpf2a32[BPF_REG_1];
|
||||
const u8 *r2 = bpf2a32[BPF_REG_2];
|
||||
const u8 *r3 = bpf2a32[BPF_REG_3];
|
||||
const u8 *r4 = bpf2a32[BPF_REG_4];
|
||||
const u8 *r5 = bpf2a32[BPF_REG_5];
|
||||
const s8 *r0 = bpf2a32[BPF_REG_0];
|
||||
const s8 *r1 = bpf2a32[BPF_REG_1];
|
||||
const s8 *r2 = bpf2a32[BPF_REG_2];
|
||||
const s8 *r3 = bpf2a32[BPF_REG_3];
|
||||
const s8 *r4 = bpf2a32[BPF_REG_4];
|
||||
const s8 *r5 = bpf2a32[BPF_REG_5];
|
||||
const u32 func = (u32)__bpf_call_base + (u32)imm;
|
||||
|
||||
emit_a32_mov_r64(true, r0, r1, false, false, ctx);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user