1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * A small micro-assembler. It is intentionally kept simple, does only 7 * support a subset of instructions, and does not try to hide pipeline 8 * effects like branch delay slots. 9 * 10 * Copyright (C) 2004, 2005, 2006, 2008 Thiemo Seufer 11 * Copyright (C) 2005, 2007 Maciej W. Rozycki 12 * Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org) 13 * Copyright (C) 2012, 2013 MIPS Technologies, Inc. All rights reserved. 14 */ 15 16 #include <linux/kernel.h> 17 #include <linux/types.h> 18 #include <linux/init.h> 19 20 #include <asm/inst.h> 21 #include <asm/elf.h> 22 #include <asm/bugs.h> 23 #define UASM_ISA _UASM_ISA_CLASSIC 24 #include <asm/uasm.h> 25 26 #define RS_MASK 0x1f 27 #define RS_SH 21 28 #define RT_MASK 0x1f 29 #define RT_SH 16 30 #define SCIMM_MASK 0xfffff 31 #define SCIMM_SH 6 32 33 /* This macro sets the non-variable bits of an instruction. */ 34 #define M(a, b, c, d, e, f) \ 35 ((a) << OP_SH \ 36 | (b) << RS_SH \ 37 | (c) << RT_SH \ 38 | (d) << RD_SH \ 39 | (e) << RE_SH \ 40 | (f) << FUNC_SH) 41 42 /* Define these when we are not the ISA the kernel is being compiled with. */ 43 #ifdef CONFIG_CPU_MICROMIPS 44 #define CL_uasm_i_b(buf, off) ISAOPC(_beq)(buf, 0, 0, off) 45 #define CL_uasm_i_beqz(buf, rs, off) ISAOPC(_beq)(buf, rs, 0, off) 46 #define CL_uasm_i_beqzl(buf, rs, off) ISAOPC(_beql)(buf, rs, 0, off) 47 #define CL_uasm_i_bnez(buf, rs, off) ISAOPC(_bne)(buf, rs, 0, off) 48 #endif 49 50 #include "uasm.c" 51 52 static struct insn insn_table[] = { 53 { insn_addiu, M(addiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 54 { insn_addu, M(spec_op, 0, 0, 0, 0, addu_op), RS | RT | RD }, 55 { insn_andi, M(andi_op, 0, 0, 0, 0, 0), RS | RT | UIMM }, 56 { insn_and, M(spec_op, 0, 0, 0, 0, and_op), RS | RT | RD }, 57 { insn_bbit0, M(lwc2_op, 0, 0, 0, 0, 0), RS | RT | BIMM }, 58 { insn_bbit1, M(swc2_op, 0, 0, 0, 0, 0), RS | RT | BIMM }, 59 { insn_beql, M(beql_op, 0, 0, 0, 0, 0), RS | RT | BIMM }, 60 { insn_beq, M(beq_op, 0, 0, 0, 0, 0), RS | RT | BIMM }, 61 { insn_bgezl, M(bcond_op, 0, bgezl_op, 0, 0, 0), RS | BIMM }, 62 { insn_bgez, M(bcond_op, 0, bgez_op, 0, 0, 0), RS | BIMM }, 63 { insn_bltzl, M(bcond_op, 0, bltzl_op, 0, 0, 0), RS | BIMM }, 64 { insn_bltz, M(bcond_op, 0, bltz_op, 0, 0, 0), RS | BIMM }, 65 { insn_bne, M(bne_op, 0, 0, 0, 0, 0), RS | RT | BIMM }, 66 { insn_cache, M(cache_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 67 { insn_daddiu, M(daddiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 68 { insn_daddu, M(spec_op, 0, 0, 0, 0, daddu_op), RS | RT | RD }, 69 { insn_dinsm, M(spec3_op, 0, 0, 0, 0, dinsm_op), RS | RT | RD | RE }, 70 { insn_dins, M(spec3_op, 0, 0, 0, 0, dins_op), RS | RT | RD | RE }, 71 { insn_dmfc0, M(cop0_op, dmfc_op, 0, 0, 0, 0), RT | RD | SET}, 72 { insn_dmtc0, M(cop0_op, dmtc_op, 0, 0, 0, 0), RT | RD | SET}, 73 { insn_drotr32, M(spec_op, 1, 0, 0, 0, dsrl32_op), RT | RD | RE }, 74 { insn_drotr, M(spec_op, 1, 0, 0, 0, dsrl_op), RT | RD | RE }, 75 { insn_dsll32, M(spec_op, 0, 0, 0, 0, dsll32_op), RT | RD | RE }, 76 { insn_dsll, M(spec_op, 0, 0, 0, 0, dsll_op), RT | RD | RE }, 77 { insn_dsra, M(spec_op, 0, 0, 0, 0, dsra_op), RT | RD | RE }, 78 { insn_dsrl32, M(spec_op, 0, 0, 0, 0, dsrl32_op), RT | RD | RE }, 79 { insn_dsrl, M(spec_op, 0, 0, 0, 0, dsrl_op), RT | RD | RE }, 80 { insn_dsubu, M(spec_op, 0, 0, 0, 0, dsubu_op), RS | RT | RD }, 81 { insn_eret, M(cop0_op, cop_op, 0, 0, 0, eret_op), 0 }, 82 { insn_ext, M(spec3_op, 0, 0, 0, 0, ext_op), RS | RT | RD | RE }, 83 { insn_ins, M(spec3_op, 0, 0, 0, 0, ins_op), RS | RT | RD | RE }, 84 { insn_j, M(j_op, 0, 0, 0, 0, 0), JIMM }, 85 { insn_jal, M(jal_op, 0, 0, 0, 0, 0), JIMM }, 86 { insn_j, M(j_op, 0, 0, 0, 0, 0), JIMM }, 87 { insn_jr, M(spec_op, 0, 0, 0, 0, jr_op), RS }, 88 { insn_ld, M(ld_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 89 { insn_ldx, M(spec3_op, 0, 0, 0, ldx_op, lx_op), RS | RT | RD }, 90 { insn_lld, M(lld_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 91 { insn_ll, M(ll_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 92 { insn_lui, M(lui_op, 0, 0, 0, 0, 0), RT | SIMM }, 93 { insn_lw, M(lw_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 94 { insn_lwx, M(spec3_op, 0, 0, 0, lwx_op, lx_op), RS | RT | RD }, 95 { insn_mfc0, M(cop0_op, mfc_op, 0, 0, 0, 0), RT | RD | SET}, 96 { insn_mtc0, M(cop0_op, mtc_op, 0, 0, 0, 0), RT | RD | SET}, 97 { insn_ori, M(ori_op, 0, 0, 0, 0, 0), RS | RT | UIMM }, 98 { insn_or, M(spec_op, 0, 0, 0, 0, or_op), RS | RT | RD }, 99 { insn_pref, M(pref_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 100 { insn_rfe, M(cop0_op, cop_op, 0, 0, 0, rfe_op), 0 }, 101 { insn_rotr, M(spec_op, 1, 0, 0, 0, srl_op), RT | RD | RE }, 102 { insn_scd, M(scd_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 103 { insn_sc, M(sc_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 104 { insn_sd, M(sd_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 105 { insn_sll, M(spec_op, 0, 0, 0, 0, sll_op), RT | RD | RE }, 106 { insn_sra, M(spec_op, 0, 0, 0, 0, sra_op), RT | RD | RE }, 107 { insn_srl, M(spec_op, 0, 0, 0, 0, srl_op), RT | RD | RE }, 108 { insn_subu, M(spec_op, 0, 0, 0, 0, subu_op), RS | RT | RD }, 109 { insn_sw, M(sw_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, 110 { insn_syscall, M(spec_op, 0, 0, 0, 0, syscall_op), SCIMM}, 111 { insn_tlbp, M(cop0_op, cop_op, 0, 0, 0, tlbp_op), 0 }, 112 { insn_tlbr, M(cop0_op, cop_op, 0, 0, 0, tlbr_op), 0 }, 113 { insn_tlbwi, M(cop0_op, cop_op, 0, 0, 0, tlbwi_op), 0 }, 114 { insn_tlbwr, M(cop0_op, cop_op, 0, 0, 0, tlbwr_op), 0 }, 115 { insn_xori, M(xori_op, 0, 0, 0, 0, 0), RS | RT | UIMM }, 116 { insn_xor, M(spec_op, 0, 0, 0, 0, xor_op), RS | RT | RD }, 117 { insn_invalid, 0, 0 } 118 }; 119 120 #undef M 121 122 static inline u32 build_bimm(s32 arg) 123 { 124 WARN(arg > 0x1ffff || arg < -0x20000, 125 KERN_WARNING "Micro-assembler field overflow\n"); 126 127 WARN(arg & 0x3, KERN_WARNING "Invalid micro-assembler branch target\n"); 128 129 return ((arg < 0) ? (1 << 15) : 0) | ((arg >> 2) & 0x7fff); 130 } 131 132 static inline u32 build_jimm(u32 arg) 133 { 134 WARN(arg & ~(JIMM_MASK << 2), 135 KERN_WARNING "Micro-assembler field overflow\n"); 136 137 return (arg >> 2) & JIMM_MASK; 138 } 139 140 /* 141 * The order of opcode arguments is implicitly left to right, 142 * starting with RS and ending with FUNC or IMM. 143 */ 144 static void build_insn(u32 **buf, enum opcode opc, ...) 145 { 146 struct insn *ip = NULL; 147 unsigned int i; 148 va_list ap; 149 u32 op; 150 151 for (i = 0; insn_table[i].opcode != insn_invalid; i++) 152 if (insn_table[i].opcode == opc) { 153 ip = &insn_table[i]; 154 break; 155 } 156 157 if (!ip || (opc == insn_daddiu && r4k_daddiu_bug())) 158 panic("Unsupported Micro-assembler instruction %d", opc); 159 160 op = ip->match; 161 va_start(ap, opc); 162 if (ip->fields & RS) 163 op |= build_rs(va_arg(ap, u32)); 164 if (ip->fields & RT) 165 op |= build_rt(va_arg(ap, u32)); 166 if (ip->fields & RD) 167 op |= build_rd(va_arg(ap, u32)); 168 if (ip->fields & RE) 169 op |= build_re(va_arg(ap, u32)); 170 if (ip->fields & SIMM) 171 op |= build_simm(va_arg(ap, s32)); 172 if (ip->fields & UIMM) 173 op |= build_uimm(va_arg(ap, u32)); 174 if (ip->fields & BIMM) 175 op |= build_bimm(va_arg(ap, s32)); 176 if (ip->fields & JIMM) 177 op |= build_jimm(va_arg(ap, u32)); 178 if (ip->fields & FUNC) 179 op |= build_func(va_arg(ap, u32)); 180 if (ip->fields & SET) 181 op |= build_set(va_arg(ap, u32)); 182 if (ip->fields & SCIMM) 183 op |= build_scimm(va_arg(ap, u32)); 184 va_end(ap); 185 186 **buf = op; 187 (*buf)++; 188 } 189 190 static inline void 191 __resolve_relocs(struct uasm_reloc *rel, struct uasm_label *lab) 192 { 193 long laddr = (long)lab->addr; 194 long raddr = (long)rel->addr; 195 196 switch (rel->type) { 197 case R_MIPS_PC16: 198 *rel->addr |= build_bimm(laddr - (raddr + 4)); 199 break; 200 201 default: 202 panic("Unsupported Micro-assembler relocation %d", 203 rel->type); 204 } 205 } 206