diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index d00a0eb0386ee9ff912b552b02e004379ecc31d8..e90229d58c77fbad736d74a95f7750c0c46c96a2 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -27,6 +27,27 @@ int bpf_jit_enable __read_mostly; +/* + * eBPF prog stack layout + * + * high + * original ARM_SP => +-----+ eBPF prologue + * |FP/LR| + * current ARM_FP => +-----+ + * | ... | callee saved registers + * eBPF fp register => +-----+ <= (BPF_FP) + * | ... | eBPF JIT scratch space + * | | eBPF prog stack + * +-----+ + * |RSVD | JIT scratchpad + * current ARM_SP => +-----+ <= (BPF_FP - STACK_SIZE) + * | | + * | ... | Function call stack + * | | + * +-----+ + * low + */ + #define STACK_OFFSET(k) (k) #define TMP_REG_1 (MAX_BPF_JIT_REG + 0) /* TEMP Register 1 */ #define TMP_REG_2 (MAX_BPF_JIT_REG + 1) /* TEMP Register 2 */ @@ -1091,27 +1112,6 @@ static void build_prologue(struct jit_ctx *ctx) u16 reg_set = 0; - /* - * eBPF prog stack layout - * - * high - * original ARM_SP => +-----+ eBPF prologue - * |FP/LR| - * current ARM_FP => +-----+ - * | ... | callee saved registers - * eBPF fp register => +-----+ <= (BPF_FP) - * | ... | eBPF JIT scratch space - * | | eBPF prog stack - * +-----+ - * |RSVD | JIT scratchpad - * current A64_SP => +-----+ <= (BPF_FP - STACK_SIZE) - * | | - * | ... | Function call stack - * | | - * +-----+ - * low - */ - /* Save callee saved registers. */ reg_set |= (1<