uasm-micromips.c
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/*
* 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 <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[] = {
{ 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 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 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 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
__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);
}
}