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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 | #include <asm/uasm.h> | |
24 | ||
25 | #define RS_MASK 0x1f | |
26 | #define RS_SH 21 | |
27 | #define RT_MASK 0x1f | |
28 | #define RT_SH 16 | |
29 | #define SCIMM_MASK 0xfffff | |
30 | #define SCIMM_SH 6 | |
31 | ||
32 | /* This macro sets the non-variable bits of an instruction. */ | |
33 | #define M(a, b, c, d, e, f) \ | |
34 | ((a) << OP_SH \ | |
35 | | (b) << RS_SH \ | |
36 | | (c) << RT_SH \ | |
37 | | (d) << RD_SH \ | |
38 | | (e) << RE_SH \ | |
39 | | (f) << FUNC_SH) | |
40 | ||
41 | #include "uasm.c" | |
42 | ||
43 | static struct insn insn_table[] __uasminitdata = { | |
44 | { insn_addiu, M(addiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
45 | { insn_addu, M(spec_op, 0, 0, 0, 0, addu_op), RS | RT | RD }, | |
46 | { insn_andi, M(andi_op, 0, 0, 0, 0, 0), RS | RT | UIMM }, | |
47 | { insn_and, M(spec_op, 0, 0, 0, 0, and_op), RS | RT | RD }, | |
48 | { insn_bbit0, M(lwc2_op, 0, 0, 0, 0, 0), RS | RT | BIMM }, | |
49 | { insn_bbit1, M(swc2_op, 0, 0, 0, 0, 0), RS | RT | BIMM }, | |
50 | { insn_beql, M(beql_op, 0, 0, 0, 0, 0), RS | RT | BIMM }, | |
51 | { insn_beq, M(beq_op, 0, 0, 0, 0, 0), RS | RT | BIMM }, | |
52 | { insn_bgezl, M(bcond_op, 0, bgezl_op, 0, 0, 0), RS | BIMM }, | |
53 | { insn_bgez, M(bcond_op, 0, bgez_op, 0, 0, 0), RS | BIMM }, | |
54 | { insn_bltzl, M(bcond_op, 0, bltzl_op, 0, 0, 0), RS | BIMM }, | |
55 | { insn_bltz, M(bcond_op, 0, bltz_op, 0, 0, 0), RS | BIMM }, | |
56 | { insn_bne, M(bne_op, 0, 0, 0, 0, 0), RS | RT | BIMM }, | |
57 | { insn_cache, M(cache_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
58 | { insn_daddiu, M(daddiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
59 | { insn_daddu, M(spec_op, 0, 0, 0, 0, daddu_op), RS | RT | RD }, | |
60 | { insn_dinsm, M(spec3_op, 0, 0, 0, 0, dinsm_op), RS | RT | RD | RE }, | |
61 | { insn_dins, M(spec3_op, 0, 0, 0, 0, dins_op), RS | RT | RD | RE }, | |
62 | { insn_dmfc0, M(cop0_op, dmfc_op, 0, 0, 0, 0), RT | RD | SET}, | |
63 | { insn_dmtc0, M(cop0_op, dmtc_op, 0, 0, 0, 0), RT | RD | SET}, | |
64 | { insn_drotr32, M(spec_op, 1, 0, 0, 0, dsrl32_op), RT | RD | RE }, | |
65 | { insn_drotr, M(spec_op, 1, 0, 0, 0, dsrl_op), RT | RD | RE }, | |
66 | { insn_dsll32, M(spec_op, 0, 0, 0, 0, dsll32_op), RT | RD | RE }, | |
67 | { insn_dsll, M(spec_op, 0, 0, 0, 0, dsll_op), RT | RD | RE }, | |
68 | { insn_dsra, M(spec_op, 0, 0, 0, 0, dsra_op), RT | RD | RE }, | |
69 | { insn_dsrl32, M(spec_op, 0, 0, 0, 0, dsrl32_op), RT | RD | RE }, | |
70 | { insn_dsrl, M(spec_op, 0, 0, 0, 0, dsrl_op), RT | RD | RE }, | |
71 | { insn_dsubu, M(spec_op, 0, 0, 0, 0, dsubu_op), RS | RT | RD }, | |
72 | { insn_eret, M(cop0_op, cop_op, 0, 0, 0, eret_op), 0 }, | |
73 | { insn_ext, M(spec3_op, 0, 0, 0, 0, ext_op), RS | RT | RD | RE }, | |
74 | { insn_ins, M(spec3_op, 0, 0, 0, 0, ins_op), RS | RT | RD | RE }, | |
75 | { insn_j, M(j_op, 0, 0, 0, 0, 0), JIMM }, | |
76 | { insn_jal, M(jal_op, 0, 0, 0, 0, 0), JIMM }, | |
77 | { insn_j, M(j_op, 0, 0, 0, 0, 0), JIMM }, | |
78 | { insn_jr, M(spec_op, 0, 0, 0, 0, jr_op), RS }, | |
79 | { insn_ld, M(ld_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
80 | { insn_ldx, M(spec3_op, 0, 0, 0, ldx_op, lx_op), RS | RT | RD }, | |
81 | { insn_lld, M(lld_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
82 | { insn_ll, M(ll_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
83 | { insn_lui, M(lui_op, 0, 0, 0, 0, 0), RT | SIMM }, | |
84 | { insn_lw, M(lw_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
85 | { insn_lwx, M(spec3_op, 0, 0, 0, lwx_op, lx_op), RS | RT | RD }, | |
86 | { insn_mfc0, M(cop0_op, mfc_op, 0, 0, 0, 0), RT | RD | SET}, | |
87 | { insn_mtc0, M(cop0_op, mtc_op, 0, 0, 0, 0), RT | RD | SET}, | |
88 | { insn_ori, M(ori_op, 0, 0, 0, 0, 0), RS | RT | UIMM }, | |
89 | { insn_or, M(spec_op, 0, 0, 0, 0, or_op), RS | RT | RD }, | |
90 | { insn_pref, M(pref_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
91 | { insn_rfe, M(cop0_op, cop_op, 0, 0, 0, rfe_op), 0 }, | |
92 | { insn_rotr, M(spec_op, 1, 0, 0, 0, srl_op), RT | RD | RE }, | |
93 | { insn_scd, M(scd_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
94 | { insn_sc, M(sc_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
95 | { insn_sd, M(sd_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
96 | { insn_sll, M(spec_op, 0, 0, 0, 0, sll_op), RT | RD | RE }, | |
97 | { insn_sra, M(spec_op, 0, 0, 0, 0, sra_op), RT | RD | RE }, | |
98 | { insn_srl, M(spec_op, 0, 0, 0, 0, srl_op), RT | RD | RE }, | |
99 | { insn_subu, M(spec_op, 0, 0, 0, 0, subu_op), RS | RT | RD }, | |
100 | { insn_sw, M(sw_op, 0, 0, 0, 0, 0), RS | RT | SIMM }, | |
101 | { insn_syscall, M(spec_op, 0, 0, 0, 0, syscall_op), SCIMM}, | |
102 | { insn_tlbp, M(cop0_op, cop_op, 0, 0, 0, tlbp_op), 0 }, | |
103 | { insn_tlbr, M(cop0_op, cop_op, 0, 0, 0, tlbr_op), 0 }, | |
104 | { insn_tlbwi, M(cop0_op, cop_op, 0, 0, 0, tlbwi_op), 0 }, | |
105 | { insn_tlbwr, M(cop0_op, cop_op, 0, 0, 0, tlbwr_op), 0 }, | |
106 | { insn_xori, M(xori_op, 0, 0, 0, 0, 0), RS | RT | UIMM }, | |
107 | { insn_xor, M(spec_op, 0, 0, 0, 0, xor_op), RS | RT | RD }, | |
108 | { insn_invalid, 0, 0 } | |
109 | }; | |
110 | ||
111 | #undef M | |
112 | ||
113 | static inline __uasminit u32 build_bimm(s32 arg) | |
114 | { | |
115 | WARN(arg > 0x1ffff || arg < -0x20000, | |
116 | KERN_WARNING "Micro-assembler field overflow\n"); | |
117 | ||
118 | WARN(arg & 0x3, KERN_WARNING "Invalid micro-assembler branch target\n"); | |
119 | ||
120 | return ((arg < 0) ? (1 << 15) : 0) | ((arg >> 2) & 0x7fff); | |
121 | } | |
122 | ||
123 | static inline __uasminit u32 build_jimm(u32 arg) | |
124 | { | |
125 | WARN(arg & ~(JIMM_MASK << 2), | |
126 | KERN_WARNING "Micro-assembler field overflow\n"); | |
127 | ||
128 | return (arg >> 2) & JIMM_MASK; | |
129 | } | |
130 | ||
131 | /* | |
132 | * The order of opcode arguments is implicitly left to right, | |
133 | * starting with RS and ending with FUNC or IMM. | |
134 | */ | |
135 | static void __uasminit build_insn(u32 **buf, enum opcode opc, ...) | |
136 | { | |
137 | struct insn *ip = NULL; | |
138 | unsigned int i; | |
139 | va_list ap; | |
140 | u32 op; | |
141 | ||
142 | for (i = 0; insn_table[i].opcode != insn_invalid; i++) | |
143 | if (insn_table[i].opcode == opc) { | |
144 | ip = &insn_table[i]; | |
145 | break; | |
146 | } | |
147 | ||
148 | if (!ip || (opc == insn_daddiu && r4k_daddiu_bug())) | |
149 | panic("Unsupported Micro-assembler instruction %d", opc); | |
150 | ||
151 | op = ip->match; | |
152 | va_start(ap, opc); | |
153 | if (ip->fields & RS) | |
154 | op |= build_rs(va_arg(ap, u32)); | |
155 | if (ip->fields & RT) | |
156 | op |= build_rt(va_arg(ap, u32)); | |
157 | if (ip->fields & RD) | |
158 | op |= build_rd(va_arg(ap, u32)); | |
159 | if (ip->fields & RE) | |
160 | op |= build_re(va_arg(ap, u32)); | |
161 | if (ip->fields & SIMM) | |
162 | op |= build_simm(va_arg(ap, s32)); | |
163 | if (ip->fields & UIMM) | |
164 | op |= build_uimm(va_arg(ap, u32)); | |
165 | if (ip->fields & BIMM) | |
166 | op |= build_bimm(va_arg(ap, s32)); | |
167 | if (ip->fields & JIMM) | |
168 | op |= build_jimm(va_arg(ap, u32)); | |
169 | if (ip->fields & FUNC) | |
170 | op |= build_func(va_arg(ap, u32)); | |
171 | if (ip->fields & SET) | |
172 | op |= build_set(va_arg(ap, u32)); | |
173 | if (ip->fields & SCIMM) | |
174 | op |= build_scimm(va_arg(ap, u32)); | |
175 | va_end(ap); | |
176 | ||
177 | **buf = op; | |
178 | (*buf)++; | |
179 | } | |
180 | ||
181 | static inline void __uasminit | |
182 | __resolve_relocs(struct uasm_reloc *rel, struct uasm_label *lab) | |
183 | { | |
184 | long laddr = (long)lab->addr; | |
185 | long raddr = (long)rel->addr; | |
186 | ||
187 | switch (rel->type) { | |
188 | case R_MIPS_PC16: | |
189 | *rel->addr |= build_bimm(laddr - (raddr + 4)); | |
190 | break; | |
191 | ||
192 | default: | |
193 | panic("Unsupported Micro-assembler relocation %d", | |
194 | rel->type); | |
195 | } | |
196 | } |