/* * bpf_jit.h: BPF JIT compiler for PPC * * Copyright 2011 Matt Evans , IBM Corporation * 2016 Naveen N. Rao * * 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. */ #ifndef _BPF_JIT_H #define _BPF_JIT_H #ifndef __ASSEMBLY__ #include #ifdef PPC64_ELF_ABI_v1 #define FUNCTION_DESCR_SIZE 24 #else #define FUNCTION_DESCR_SIZE 0 #endif /* * 16-bit immediate helper macros: HA() is for use with sign-extending instrs * (e.g. LD, ADDI). If the bottom 16 bits is "-ve", add another bit into the * top half to negate the effect (i.e. 0xffff + 1 = 0x(1)0000). */ #define IMM_H(i) ((uintptr_t)(i)>>16) #define IMM_HA(i) (((uintptr_t)(i)>>16) + \ (((uintptr_t)(i) & 0x8000) >> 15)) #define IMM_L(i) ((uintptr_t)(i) & 0xffff) #define PLANT_INSTR(d, idx, instr) \ do { if (d) { (d)[idx] = instr; } idx++; } while (0) #define EMIT(instr) PLANT_INSTR(image, ctx->idx, instr) #define PPC_NOP() EMIT(PPC_INST_NOP) #define PPC_BLR() EMIT(PPC_INST_BLR) #define PPC_BLRL() EMIT(PPC_INST_BLRL) #define PPC_MTLR(r) EMIT(PPC_INST_MTLR | ___PPC_RT(r)) #define PPC_BCTR() EMIT(PPC_INST_BCTR) #define PPC_MTCTR(r) EMIT(PPC_INST_MTCTR | ___PPC_RT(r)) #define PPC_ADDI(d, a, i) EMIT(PPC_INST_ADDI | ___PPC_RT(d) | \ ___PPC_RA(a) | IMM_L(i)) #define PPC_MR(d, a) PPC_OR(d, a, a) #define PPC_LI(r, i) PPC_ADDI(r, 0, i) #define PPC_ADDIS(d, a, i) EMIT(PPC_INST_ADDIS | \ ___PPC_RT(d) | ___PPC_RA(a) | IMM_L(i)) #define PPC_LIS(r, i) PPC_ADDIS(r, 0, i) #define PPC_STD(r, base, i) EMIT(PPC_INST_STD | ___PPC_RS(r) | \ ___PPC_RA(base) | ((i) & 0xfffc)) #define PPC_STDX(r, base, b) EMIT(PPC_INST_STDX | ___PPC_RS(r) | \ ___PPC_RA(base) | ___PPC_RB(b)) #define PPC_STDU(r, base, i) EMIT(PPC_INST_STDU | ___PPC_RS(r) | \ ___PPC_RA(base) | ((i) & 0xfffc)) #define PPC_STW(r, base, i) EMIT(PPC_INST_STW | ___PPC_RS(r) | \ ___PPC_RA(base) | IMM_L(i)) #define PPC_STWU(r, base, i) EMIT(PPC_INST_STWU | ___PPC_RS(r) | \ ___PPC_RA(base) | IMM_L(i)) #define PPC_STH(r, base, i) EMIT(PPC_INST_STH | ___PPC_RS(r) | \ ___PPC_RA(base) | IMM_L(i)) #define PPC_STB(r, base, i) EMIT(PPC_INST_STB | ___PPC_RS(r) | \ ___PPC_RA(base) | IMM_L(i)) #define PPC_LBZ(r, base, i) EMIT(PPC_INST_LBZ | ___PPC_RT(r) | \ ___PPC_RA(base) | IMM_L(i)) #define PPC_LD(r, base, i) EMIT(PPC_INST_LD | ___PPC_RT(r) | \ ___PPC_RA(base) | ((i) & 0xfffc)) #define PPC_LDX(r, base, b) EMIT(PPC_INST_LDX | ___PPC_RT(r) | \ ___PPC_RA(base) | ___PPC_RB(b)) #define PPC_LWZ(r, base, i) EMIT(PPC_INST_LWZ | ___PPC_RT(r) | \ ___PPC_RA(base) | IMM_L(i)) #define PPC_LHZ(r, base, i) EMIT(PPC_INST_LHZ | ___PPC_RT(r) | \ ___PPC_RA(base) | IMM_L(i)) #define PPC_LHBRX(r, base, b) EMIT(PPC_INST_LHBRX | ___PPC_RT(r) | \ ___PPC_RA(base) | ___PPC_RB(b)) #define PPC_LDBRX(r, base, b) EMIT(PPC_INST_LDBRX | ___PPC_RT(r) | \ ___PPC_RA(base) | ___PPC_RB(b)) #define PPC_BPF_LDARX(t, a, b, eh) EMIT(PPC_INST_LDARX | ___PPC_RT(t) | \ ___PPC_RA(a) | ___PPC_RB(b) | \ __PPC_EH(eh)) #define PPC_BPF_LWARX(t, a, b, eh) EMIT(PPC_INST_LWARX | ___PPC_RT(t) | \ ___PPC_RA(a) | ___PPC_RB(b) | \ __PPC_EH(eh)) #define PPC_BPF_STWCX(s, a, b) EMIT(PPC_INST_STWCX | ___PPC_RS(s) | \ ___PPC_RA(a) | ___PPC_RB(b)) #define PPC_BPF_STDCX(s, a, b) EMIT(PPC_INST_STDCX | ___PPC_RS(s) | \ ___PPC_RA(a) | ___PPC_RB(b)) #define PPC_CMPWI(a, i) EMIT(PPC_INST_CMPWI | ___PPC_RA(a) | IMM_L(i)) #define PPC_CMPDI(a, i) EMIT(PPC_INST_CMPDI | ___PPC_RA(a) | IMM_L(i)) #define PPC_CMPW(a, b) EMIT(PPC_INST_CMPW | ___PPC_RA(a) | \ ___PPC_RB(b)) #define PPC_CMPD(a, b) EMIT(PPC_INST_CMPD | ___PPC_RA(a) | \ ___PPC_RB(b)) #define PPC_CMPLWI(a, i) EMIT(PPC_INST_CMPLWI | ___PPC_RA(a) | IMM_L(i)) #define PPC_CMPLDI(a, i) EMIT(PPC_INST_CMPLDI | ___PPC_RA(a) | IMM_L(i)) #define PPC_CMPLW(a, b) EMIT(PPC_INST_CMPLW | ___PPC_RA(a) | \ ___PPC_RB(b)) #define PPC_CMPLD(a, b) EMIT(PPC_INST_CMPLD | ___PPC_RA(a) | \ ___PPC_RB(b)) #define PPC_SUB(d, a, b) EMIT(PPC_INST_SUB | ___PPC_RT(d) | \ ___PPC_RB(a) | ___PPC_RA(b)) #define PPC_ADD(d, a, b) EMIT(PPC_INST_ADD | ___PPC_RT(d) | \ ___PPC_RA(a) | ___PPC_RB(b)) #define PPC_MULD(d, a, b) EMIT(PPC_INST_MULLD | ___PPC_RT(d) | \ ___PPC_RA(a) | ___PPC_RB(b)) #define PPC_MULW(d, a, b) EMIT(PPC_INST_MULLW | ___PPC_RT(d) | \ ___PPC_RA(a) | ___PPC_RB(b)) #define PPC_MULHWU(d, a, b) EMIT(PPC_INST_MULHWU | ___PPC_RT(d) | \ ___PPC_RA(a) | ___PPC_RB(b)) #define PPC_MULI(d, a, i) EMIT(PPC_INST_MULLI | ___PPC_RT(d) | \ ___PPC_RA(a) | IMM_L(i)) #define PPC_DIVWU(d, a, b) EMIT(PPC_INST_DIVWU | ___PPC_RT(d) | \ ___PPC_RA(a) | ___PPC_RB(b)) #define PPC_DIVDU(d, a, b) EMIT(PPC_INST_DIVDU | ___PPC_RT(d) | \ ___PPC_RA(a) | ___PPC_RB(b)) #define PPC_AND(d, a, b) EMIT(PPC_INST_AND | ___PPC_RA(d) | \ ___PPC_RS(a) | ___PPC_RB(b)) #define PPC_ANDI(d, a, i) EMIT(PPC_INST_ANDI | ___PPC_RA(d) | \ ___PPC_RS(a) | IMM_L(i)) #define PPC_AND_DOT(d, a, b) EMIT(PPC_INST_ANDDOT | ___PPC_RA(d) | \ ___PPC_RS(a) | ___PPC_RB(b)) #define PPC_OR(d, a, b) EMIT(PPC_INST_OR | ___PPC_RA(d) | \ ___PPC_RS(a) | ___PPC_RB(b)) #define PPC_MR(d, a) PPC_OR(d, a, a) #define PPC_ORI(d, a, i) EMIT(PPC_INST_ORI | ___PPC_RA(d) | \ ___PPC_RS(a) | IMM_L(i)) #define PPC_ORIS(d, a, i) EMIT(PPC_INST_ORIS | ___PPC_RA(d) | \ ___PPC_RS(a) | IMM_L(i)) #define PPC_XOR(d, a, b) EMIT(PPC_INST_XOR | ___PPC_RA(d) | \ ___PPC_RS(a) | ___PPC_RB(b)) #define PPC_XORI(d, a, i) EMIT(PPC_INST_XORI | ___PPC_RA(d) | \ ___PPC_RS(a) | IMM_L(i)) #define PPC_XORIS(d, a, i) EMIT(PPC_INST_XORIS | ___PPC_RA(d) | \ ___PPC_RS(a) | IMM_L(i)) #define PPC_EXTSW(d, a) EMIT(PPC_INST_EXTSW | ___PPC_RA(d) | \ ___PPC_RS(a)) #define PPC_SLW(d, a, s) EMIT(PPC_INST_SLW | ___PPC_RA(d) | \ ___PPC_RS(a) | ___PPC_RB(s)) #define PPC_SLD(d, a, s) EMIT(PPC_INST_SLD | ___PPC_RA(d) | \ ___PPC_RS(a) | ___PPC_RB(s)) #define PPC_SRW(d, a, s) EMIT(PPC_INST_SRW | ___PPC_RA(d) | \ ___PPC_RS(a) | ___PPC_RB(s)) #define PPC_SRD(d, a, s) EMIT(PPC_INST_SRD | ___PPC_RA(d) | \ ___PPC_RS(a) | ___PPC_RB(s)) #define PPC_SRAD(d, a, s) EMIT(PPC_INST_SRAD | ___PPC_RA(d) | \ ___PPC_RS(a) | ___PPC_RB(s)) #define PPC_SRADI(d, a, i) EMIT(PPC_INST_SRADI | ___PPC_RA(d) | \ ___PPC_RS(a) | __PPC_SH(i) | \ (((i) & 0x20) >> 4)) #define PPC_RLWINM(d, a, i, mb, me) EMIT(PPC_INST_RLWINM | ___PPC_RA(d) | \ ___PPC_RS(a) | __PPC_SH(i) | \ __PPC_MB(mb) | __PPC_ME(me)) #define PPC_RLWIMI(d, a, i, mb, me) EMIT(PPC_INST_RLWIMI | ___PPC_RA(d) | \ ___PPC_RS(a) | __PPC_SH(i) | \ __PPC_MB(mb) | __PPC_ME(me)) #define PPC_RLDICL(d, a, i, mb) EMIT(PPC_INST_RLDICL | ___PPC_RA(d) | \ ___PPC_RS(a) | __PPC_SH(i) | \ __PPC_MB64(mb) | (((i) & 0x20) >> 4)) #define PPC_RLDICR(d, a, i, me) EMIT(PPC_INST_RLDICR | ___PPC_RA(d) | \ ___PPC_RS(a) | __PPC_SH(i) | \ __PPC_ME64(me) | (((i) & 0x20) >> 4)) /* slwi = rlwinm Rx, Ry, n, 0, 31-n */ #define PPC_SLWI(d, a, i) PPC_RLWINM(d, a, i, 0, 31-(i)) /* srwi = rlwinm Rx, Ry, 32-n, n, 31 */ #define PPC_SRWI(d, a, i) PPC_RLWINM(d, a, 32-(i), i, 31) /* sldi = rldicr Rx, Ry, n, 63-n */ #define PPC_SLDI(d, a, i) PPC_RLDICR(d, a, i, 63-(i)) /* sldi = rldicl Rx, Ry, 64-n, n */ #define PPC_SRDI(d, a, i) PPC_RLDICL(d, a, 64-(i), i) #define PPC_NEG(d, a) EMIT(PPC_INST_NEG | ___PPC_RT(d) | ___PPC_RA(a)) /* Long jump; (unconditional 'branch') */ #define PPC_JMP(dest) \ do { \ long offset = (long)(dest) - (ctx->idx * 4); \ if (offset < -0x2000000 || offset > 0x1fffffc || offset & 0x3) { \ pr_err_ratelimited("Branch offset 0x%lx (@%u) out of range\n", offset, ctx->idx); \ return -ERANGE; \ } \ EMIT(PPC_INST_BRANCH | (offset & 0x03fffffc)); \ } while (0) /* "cond" here covers BO:BI fields. */ #define PPC_BCC_SHORT(cond, dest) \ do { \ long offset = (long)(dest) - (ctx->idx * 4); \ if (offset < -0x8000 || offset > 0x7fff || offset & 0x3) { \ pr_err_ratelimited("Conditional branch offset 0x%lx (@%u) out of range\n", offset, ctx->idx); \ return -ERANGE; \ } \ EMIT(PPC_INST_BRANCH_COND | (((cond) & 0x3ff) << 16) | (offset & 0xfffc)); \ } while (0) /* Sign-extended 32-bit immediate load */ #define PPC_LI32(d, i) do { \ if ((int)(uintptr_t)(i) >= -32768 && \ (int)(uintptr_t)(i) < 32768) \ PPC_LI(d, i); \ else { \ PPC_LIS(d, IMM_H(i)); \ if (IMM_L(i)) \ PPC_ORI(d, d, IMM_L(i)); \ } } while(0) #define PPC_LI64(d, i) do { \ if ((long)(i) >= -2147483648 && \ (long)(i) < 2147483648) \ PPC_LI32(d, i); \ else { \ if (!((uintptr_t)(i) & 0xffff800000000000ULL)) \ PPC_LI(d, ((uintptr_t)(i) >> 32) & 0xffff); \ else { \ PPC_LIS(d, ((uintptr_t)(i) >> 48)); \ if ((uintptr_t)(i) & 0x0000ffff00000000ULL) \ PPC_ORI(d, d, \ ((uintptr_t)(i) >> 32) & 0xffff); \ } \ PPC_SLDI(d, d, 32); \ if ((uintptr_t)(i) & 0x00000000ffff0000ULL) \ PPC_ORIS(d, d, \ ((uintptr_t)(i) >> 16) & 0xffff); \ if ((uintptr_t)(i) & 0x000000000000ffffULL) \ PPC_ORI(d, d, (uintptr_t)(i) & 0xffff); \ } } while (0) #ifdef CONFIG_PPC64 #define PPC_FUNC_ADDR(d,i) do { PPC_LI64(d, i); } while(0) #else #define PPC_FUNC_ADDR(d,i) do { PPC_LI32(d, i); } while(0) #endif static inline bool is_nearbranch(int offset) { return (offset < 32768) && (offset >= -32768); } /* * The fly in the ointment of code size changing from pass to pass is * avoided by padding the short branch case with a NOP. If code size differs * with different branch reaches we will have the issue of code moving from * one pass to the next and will need a few passes to converge on a stable * state. */ #define PPC_BCC(cond, dest) do { \ if (is_nearbranch((dest) - (ctx->idx * 4))) { \ PPC_BCC_SHORT(cond, dest); \ PPC_NOP(); \ } else { \ /* Flip the 'T or F' bit to invert comparison */ \ PPC_BCC_SHORT(cond ^ COND_CMP_TRUE, (ctx->idx+2)*4); \ PPC_JMP(dest); \ } } while(0) /* To create a branch condition, select a bit of cr0... */ #define CR0_LT 0 #define CR0_GT 1 #define CR0_EQ 2 /* ...and modify BO[3] */ #define COND_CMP_TRUE 0x100 #define COND_CMP_FALSE 0x000 /* Together, they make all required comparisons: */ #define COND_GT (CR0_GT | COND_CMP_TRUE) #define COND_GE (CR0_LT | COND_CMP_FALSE) #define COND_EQ (CR0_EQ | COND_CMP_TRUE) #define COND_NE (CR0_EQ | COND_CMP_FALSE) #define COND_LT (CR0_LT | COND_CMP_TRUE) #endif #endif