diff options
Diffstat (limited to 'arch/powerpc/net/bpf_jit.h')
| -rw-r--r-- | arch/powerpc/net/bpf_jit.h | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h index d0a67a1bbaf1..99fad093f43e 100644 --- a/arch/powerpc/net/bpf_jit.h +++ b/arch/powerpc/net/bpf_jit.h @@ -26,6 +26,9 @@ /* Long jump; (unconditional 'branch') */ #define PPC_JMP(dest) EMIT(PPC_INST_BRANCH | \ (((dest) - (ctx->idx * 4)) & 0x03fffffc)) +/* blr; (unconditional 'branch' with link) to absolute address */ +#define PPC_BL_ABS(dest) EMIT(PPC_INST_BL | \ + (((dest) - (unsigned long)(image + ctx->idx)) & 0x03fffffc)) /* "cond" here covers BO:BI fields. */ #define PPC_BCC_SHORT(cond, dest) EMIT(PPC_INST_BRANCH_COND | \ (((cond) & 0x3ff) << 16) | \ @@ -42,6 +45,10 @@ EMIT(PPC_RAW_ORI(d, d, IMM_L(i))); \ } } while(0) +#ifdef CONFIG_PPC32 +#define PPC_EX32(r, i) EMIT(PPC_RAW_LI((r), (i) < 0 ? -1 : 0)) +#endif + #define PPC_LI64(d, i) do { \ if ((long)(i) >= -2147483648 && \ (long)(i) < 2147483648) \ @@ -108,6 +115,63 @@ static inline bool is_nearbranch(int offset) #define COND_LT (CR0_LT | COND_CMP_TRUE) #define COND_LE (CR0_GT | COND_CMP_FALSE) +#define SEEN_FUNC 0x20000000 /* might call external helpers */ +#define SEEN_STACK 0x40000000 /* uses BPF stack */ +#define SEEN_TAILCALL 0x80000000 /* uses tail calls */ + +#define SEEN_VREG_MASK 0x1ff80000 /* Volatile registers r3-r12 */ +#define SEEN_NVREG_MASK 0x0003ffff /* Non volatile registers r14-r31 */ + +#ifdef CONFIG_PPC64 +extern const int b2p[MAX_BPF_JIT_REG + 2]; +#else +extern const int b2p[MAX_BPF_JIT_REG + 1]; +#endif + +struct codegen_context { + /* + * This is used to track register usage as well + * as calls to external helpers. + * - register usage is tracked with corresponding + * bits (r3-r31) + * - rest of the bits can be used to track other + * things -- for now, we use bits 0 to 2 + * encoded in SEEN_* macros above + */ + unsigned int seen; + unsigned int idx; + unsigned int stack_size; + int b2p[ARRAY_SIZE(b2p)]; +}; + +static inline void bpf_flush_icache(void *start, void *end) +{ + smp_wmb(); /* smp write barrier */ + flush_icache_range((unsigned long)start, (unsigned long)end); +} + +static inline bool bpf_is_seen_register(struct codegen_context *ctx, int i) +{ + return ctx->seen & (1 << (31 - i)); +} + +static inline void bpf_set_seen_register(struct codegen_context *ctx, int i) +{ + ctx->seen |= 1 << (31 - i); +} + +static inline void bpf_clear_seen_register(struct codegen_context *ctx, int i) +{ + ctx->seen &= ~(1 << (31 - i)); +} + +void bpf_jit_emit_func_call_rel(u32 *image, struct codegen_context *ctx, u64 func); +int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *ctx, + u32 *addrs, bool extra_pass); +void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx); +void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx); +void bpf_jit_realloc_regs(struct codegen_context *ctx); + #endif #endif |