aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/mm/uasm-micromips.c
blob: 162ee6d62788ccc3cf989a2f312ebf9b451dda36 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * A small micro-assembler. It is intentionally kept simple, does only
 * support a subset of instructions, and does not try to hide pipeline
 * effects like branch delay slots.
 *
 * Copyright (C) 2004, 2005, 2006, 2008	 Thiemo Seufer
 * Copyright (C) 2005, 2007  Maciej W. Rozycki
 * Copyright (C) 2006  Ralf Baechle (ralf@linux-mips.org)
 * Copyright (C) 2012, 2013   MIPS Technologies, Inc.  All rights reserved.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/init.h>

#include <asm/inst.h>
#include <asm/elf.h>
#include <asm/bugs.h>
#define UASM_ISA	_UASM_ISA_MICROMIPS
#include <asm/uasm.h>

#define RS_MASK		0x1f
#define RS_SH		16
#define RT_MASK		0x1f
#define RT_SH		21
#define SCIMM_MASK	0x3ff
#define SCIMM_SH	16

/* This macro sets the non-variable bits of an instruction. */
#define M(a, b, c, d, e, f)					\
	((a) << OP_SH						\
	 | (b) << RT_SH						\
	 | (c) << RS_SH						\
	 | (d) << RD_SH						\
	 | (e) << RE_SH						\
	 | (f) << FUNC_SH)

/* Define these when we are not the ISA the kernel is being compiled with. */
#ifndef CONFIG_CPU_MICROMIPS
#define MM_uasm_i_b(buf, off) ISAOPC(_beq)(buf, 0, 0, off)
#define MM_uasm_i_beqz(buf, rs, off) ISAOPC(_beq)(buf, rs, 0, off)
#define MM_uasm_i_beqzl(buf, rs, off) ISAOPC(_beql)(buf, rs, 0, off)
#define MM_uasm_i_bnez(buf, rs, off) ISAOPC(_bne)(buf, rs, 0, off)
#endif

#include "uasm.c"

static struct insn insn_table_MM[] __uasminitdata = {
	{ insn_addu, M(mm_pool32a_op, 0, 0, 0, 0, mm_addu32_op), RT | RS | RD },
	{ insn_addiu, M(mm_addiu32_op, 0, 0, 0, 0, 0), RT | RS | SIMM },
	{ insn_and, M(mm_pool32a_op, 0, 0, 0, 0, mm_and_op), RT | RS | RD },
	{ insn_andi, M(mm_andi32_op, 0, 0, 0, 0, 0), RT | RS | UIMM },
	{ insn_beq, M(mm_beq32_op, 0, 0, 0, 0, 0), RS | RT | BIMM },
	{ insn_beql, 0, 0 },
	{ insn_bgez, M(mm_pool32i_op, mm_bgez_op, 0, 0, 0, 0), RS | BIMM },
	{ insn_bgezl, 0, 0 },
	{ insn_bltz, M(mm_pool32i_op, mm_bltz_op, 0, 0, 0, 0), RS | BIMM },
	{ insn_bltzl, 0, 0 },
	{ insn_bne, M(mm_bne32_op, 0, 0, 0, 0, 0), RT | RS | BIMM },
	{ insn_cache, M(mm_pool32b_op, 0, 0, mm_cache_func, 0, 0), RT | RS | SIMM },
	{ insn_daddu, 0, 0 },
	{ insn_daddiu, 0, 0 },
	{ insn_dmfc0, 0, 0 },
	{ insn_dmtc0, 0, 0 },
	{ insn_dsll, 0, 0 },
	{ insn_dsll32, 0, 0 },
	{ insn_dsra, 0, 0 },
	{ insn_dsrl, 0, 0 },
	{ insn_dsrl32, 0, 0 },
	{ insn_drotr, 0, 0 },
	{ insn_drotr32, 0, 0 },
	{ insn_dsubu, 0, 0 },
	{ insn_eret, M(mm_pool32a_op, 0, 0, 0, mm_eret_op, mm_pool32axf_op), 0 },
	{ insn_ins, M(mm_pool32a_op, 0, 0, 0, 0, mm_ins_op), RT | RS | RD | RE },
	{ insn_ext, M(mm_pool32a_op, 0, 0, 0, 0, mm_ext_op), RT | RS | RD | RE },
	{ insn_j, M(mm_j32_op, 0, 0, 0, 0, 0), JIMM },
	{ insn_jal, M(mm_jal32_op, 0, 0, 0, 0, 0), JIMM },
	{ insn_jr, M(mm_pool32a_op, 0, 0, 0, mm_jalr_op, mm_pool32axf_op), RS },
	{ insn_ld, 0, 0 },
	{ insn_ll, M(mm_pool32c_op, 0, 0, (mm_ll_func << 1), 0, 0), RS | RT | SIMM },
	{ insn_lld, 0, 0 },
	{ insn_lui, M(mm_pool32i_op, mm_lui_op, 0, 0, 0, 0), RS | SIMM },
	{ insn_lw, M(mm_lw32_op, 0, 0, 0, 0, 0), RT | RS | SIMM },
	{ insn_mfc0, M(mm_pool32a_op, 0, 0, 0, mm_mfc0_op, mm_pool32axf_op), RT | RS | RD },
	{ insn_mtc0, M(mm_pool32a_op, 0, 0, 0, mm_mtc0_op, mm_pool32axf_op), RT | RS | RD },
	{ insn_or, M(mm_pool32a_op, 0, 0, 0, 0, mm_or32_op), RT | RS | RD },
	{ insn_ori, M(mm_ori32_op, 0, 0, 0, 0, 0), RT | RS | UIMM },
	{ insn_pref, M(mm_pool32c_op, 0, 0, (mm_pref_func << 1), 0, 0), RT | RS | SIMM },
	{ insn_rfe, 0, 0 },
	{ insn_sc, M(mm_pool32c_op, 0, 0, (mm_sc_func << 1), 0, 0), RT | RS | SIMM },
	{ insn_scd, 0, 0 },
	{ insn_sd, 0, 0 },
	{ insn_sll, M(mm_pool32a_op, 0, 0, 0, 0, mm_sll32_op), RT | RS | RD },
	{ insn_sra, M(mm_pool32a_op, 0, 0, 0, 0, mm_sra_op), RT | RS | RD },
	{ insn_srl, M(mm_pool32a_op, 0, 0, 0, 0, mm_srl32_op), RT | RS | RD },
	{ insn_rotr, M(mm_pool32a_op, 0, 0, 0, 0, mm_rotr_op), RT | RS | RD },
	{ insn_subu, M(mm_pool32a_op, 0, 0, 0, 0, mm_subu32_op), RT | RS | RD },
	{ insn_sw, M(mm_sw32_op, 0, 0, 0, 0, 0), RT | RS | SIMM },
	{ insn_tlbp, M(mm_pool32a_op, 0, 0, 0, mm_tlbp_op, mm_pool32axf_op), 0 },
	{ insn_tlbr, M(mm_pool32a_op, 0, 0, 0, mm_tlbr_op, mm_pool32axf_op), 0 },
	{ insn_tlbwi, M(mm_pool32a_op, 0, 0, 0, mm_tlbwi_op, mm_pool32axf_op), 0 },
	{ insn_tlbwr, M(mm_pool32a_op, 0, 0, 0, mm_tlbwr_op, mm_pool32axf_op), 0 },
	{ insn_xor, M(mm_pool32a_op, 0, 0, 0, 0, mm_xor32_op), RT | RS | RD },
	{ insn_xori, M(mm_xori32_op, 0, 0, 0, 0, 0), RT | RS | UIMM },
	{ insn_dins, 0, 0 },
	{ insn_dinsm, 0, 0 },
	{ insn_syscall, M(mm_pool32a_op, 0, 0, 0, mm_syscall_op, mm_pool32axf_op), SCIMM},
	{ insn_bbit0, 0, 0 },
	{ insn_bbit1, 0, 0 },
	{ insn_lwx, 0, 0 },
	{ insn_ldx, 0, 0 },
	{ insn_invalid, 0, 0 }
};

#undef M

static inline __uasminit u32 build_bimm(s32 arg)
{
	WARN(arg > 0xffff || arg < -0x10000,
	     KERN_WARNING "Micro-assembler field overflow\n");

	WARN(arg & 0x3, KERN_WARNING "Invalid micro-assembler branch target\n");

	return ((arg < 0) ? (1 << 15) : 0) | ((arg >> 1) & 0x7fff);
}

static inline __uasminit u32 build_jimm(u32 arg)
{

	WARN(arg & ~((JIMM_MASK << 2) | 1),
	     KERN_WARNING "Micro-assembler field overflow\n");

	return (arg >> 1) & JIMM_MASK;
}

/*
 * The order of opcode arguments is implicitly left to right,
 * starting with RS and ending with FUNC or IMM.
 */
static void __uasminit build_insn(u32 **buf, enum opcode opc, ...)
{
	struct insn *ip = NULL;
	unsigned int i;
	va_list ap;
	u32 op;

	for (i = 0; insn_table_MM[i].opcode != insn_invalid; i++)
		if (insn_table_MM[i].opcode == opc) {
			ip = &insn_table_MM[i];
			break;
		}

	if (!ip || (opc == insn_daddiu && r4k_daddiu_bug()))
		panic("Unsupported Micro-assembler instruction %d", opc);

	op = ip->match;
	va_start(ap, opc);
	if (ip->fields & RS) {
		if (opc == insn_mfc0 || opc == insn_mtc0)
			op |= build_rt(va_arg(ap, u32));
		else
			op |= build_rs(va_arg(ap, u32));
	}
	if (ip->fields & RT) {
		if (opc == insn_mfc0 || opc == insn_mtc0)
			op |= build_rs(va_arg(ap, u32));
		else
			op |= build_rt(va_arg(ap, u32));
	}
	if (ip->fields & RD)
		op |= build_rd(va_arg(ap, u32));
	if (ip->fields & RE)
		op |= build_re(va_arg(ap, u32));
	if (ip->fields & SIMM)
		op |= build_simm(va_arg(ap, s32));
	if (ip->fields & UIMM)
		op |= build_uimm(va_arg(ap, u32));
	if (ip->fields & BIMM)
		op |= build_bimm(va_arg(ap, s32));
	if (ip->fields & JIMM)
		op |= build_jimm(va_arg(ap, u32));
	if (ip->fields & FUNC)
		op |= build_func(va_arg(ap, u32));
	if (ip->fields & SET)
		op |= build_set(va_arg(ap, u32));
	if (ip->fields & SCIMM)
		op |= build_scimm(va_arg(ap, u32));
	va_end(ap);

#ifdef CONFIG_CPU_LITTLE_ENDIAN
	**buf = ((op & 0xffff) << 16) | (op >> 16);
#else
	**buf = op;
#endif
	(*buf)++;
}

static inline void __uasminit
__resolve_relocs(struct uasm_reloc *rel, struct uasm_label *lab)
{
	long laddr = (long)lab->addr;
	long raddr = (long)rel->addr;

	switch (rel->type) {
	case R_MIPS_PC16:
#ifdef CONFIG_CPU_LITTLE_ENDIAN
		*rel->addr |= (build_bimm(laddr - (raddr + 4)) << 16);
#else
		*rel->addr |= build_bimm(laddr - (raddr + 4));
#endif
		break;

	default:
		panic("Unsupported Micro-assembler relocation %d",
		      rel->type);
	}
}