293 lines
12 KiB
C
293 lines
12 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* A small micro-assembler. It is intentionally kept simple, does only
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* support a subset of instructions, and does not try to hide pipeline
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* effects like branch delay slots.
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*
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* Copyright (C) 2004, 2005, 2006, 2008 Thiemo Seufer
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* Copyright (C) 2005, 2007 Maciej W. Rozycki
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* Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org)
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* Copyright (C) 2012, 2013 MIPS Technologies, Inc. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <asm/inst.h>
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#include <asm/elf.h>
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#include <asm/bugs.h>
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#include <asm/uasm.h>
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#define RS_MASK 0x1f
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#define RS_SH 21
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#define RT_MASK 0x1f
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#define RT_SH 16
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#define SCIMM_MASK 0xfffff
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#define SCIMM_SH 6
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/* This macro sets the non-variable bits of an instruction. */
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#define M(a, b, c, d, e, f) \
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((a) << OP_SH \
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| (b) << RS_SH \
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| (c) << RT_SH \
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| (d) << RD_SH \
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| (e) << RE_SH \
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| (f) << FUNC_SH)
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/* This macro sets the non-variable bits of an R6 instruction. */
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#define M6(a, b, c, d, e) \
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((a) << OP_SH \
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| (b) << RS_SH \
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| (c) << RT_SH \
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| (d) << SIMM9_SH \
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| (e) << FUNC_SH)
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#include "uasm.c"
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static const struct insn insn_table[insn_invalid] = {
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[insn_addiu] = {M(addiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_addu] = {M(spec_op, 0, 0, 0, 0, addu_op), RS | RT | RD},
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[insn_and] = {M(spec_op, 0, 0, 0, 0, and_op), RS | RT | RD},
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[insn_andi] = {M(andi_op, 0, 0, 0, 0, 0), RS | RT | UIMM},
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[insn_bbit0] = {M(lwc2_op, 0, 0, 0, 0, 0), RS | RT | BIMM},
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[insn_bbit1] = {M(swc2_op, 0, 0, 0, 0, 0), RS | RT | BIMM},
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[insn_beq] = {M(beq_op, 0, 0, 0, 0, 0), RS | RT | BIMM},
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[insn_beql] = {M(beql_op, 0, 0, 0, 0, 0), RS | RT | BIMM},
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[insn_bgez] = {M(bcond_op, 0, bgez_op, 0, 0, 0), RS | BIMM},
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[insn_bgezl] = {M(bcond_op, 0, bgezl_op, 0, 0, 0), RS | BIMM},
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[insn_bgtz] = {M(bgtz_op, 0, 0, 0, 0, 0), RS | BIMM},
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[insn_blez] = {M(blez_op, 0, 0, 0, 0, 0), RS | BIMM},
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[insn_bltz] = {M(bcond_op, 0, bltz_op, 0, 0, 0), RS | BIMM},
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[insn_bltzl] = {M(bcond_op, 0, bltzl_op, 0, 0, 0), RS | BIMM},
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[insn_bne] = {M(bne_op, 0, 0, 0, 0, 0), RS | RT | BIMM},
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[insn_break] = {M(spec_op, 0, 0, 0, 0, break_op), SCIMM},
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#ifndef CONFIG_CPU_MIPSR6
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[insn_cache] = {M(cache_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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#else
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[insn_cache] = {M6(spec3_op, 0, 0, 0, cache6_op), RS | RT | SIMM9},
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#endif
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[insn_cfc1] = {M(cop1_op, cfc_op, 0, 0, 0, 0), RT | RD},
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[insn_cfcmsa] = {M(msa_op, 0, msa_cfc_op, 0, 0, msa_elm_op), RD | RE},
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[insn_ctc1] = {M(cop1_op, ctc_op, 0, 0, 0, 0), RT | RD},
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[insn_ctcmsa] = {M(msa_op, 0, msa_ctc_op, 0, 0, msa_elm_op), RD | RE},
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[insn_daddiu] = {M(daddiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_daddu] = {M(spec_op, 0, 0, 0, 0, daddu_op), RS | RT | RD},
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[insn_ddivu] = {M(spec_op, 0, 0, 0, 0, ddivu_op), RS | RT},
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[insn_ddivu_r6] = {M(spec_op, 0, 0, 0, ddivu_ddivu6_op, ddivu_op),
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RS | RT | RD},
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[insn_di] = {M(cop0_op, mfmc0_op, 0, 12, 0, 0), RT},
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[insn_dins] = {M(spec3_op, 0, 0, 0, 0, dins_op), RS | RT | RD | RE},
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[insn_dinsm] = {M(spec3_op, 0, 0, 0, 0, dinsm_op), RS | RT | RD | RE},
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[insn_dinsu] = {M(spec3_op, 0, 0, 0, 0, dinsu_op), RS | RT | RD | RE},
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[insn_divu] = {M(spec_op, 0, 0, 0, 0, divu_op), RS | RT},
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[insn_divu_r6] = {M(spec_op, 0, 0, 0, divu_divu6_op, divu_op),
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RS | RT | RD},
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[insn_dmfc0] = {M(cop0_op, dmfc_op, 0, 0, 0, 0), RT | RD | SET},
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[insn_dmodu] = {M(spec_op, 0, 0, 0, ddivu_dmodu_op, ddivu_op),
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RS | RT | RD},
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[insn_dmtc0] = {M(cop0_op, dmtc_op, 0, 0, 0, 0), RT | RD | SET},
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[insn_dmultu] = {M(spec_op, 0, 0, 0, 0, dmultu_op), RS | RT},
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[insn_dmulu] = {M(spec_op, 0, 0, 0, dmultu_dmulu_op, dmultu_op),
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RS | RT | RD},
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[insn_drotr] = {M(spec_op, 1, 0, 0, 0, dsrl_op), RT | RD | RE},
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[insn_drotr32] = {M(spec_op, 1, 0, 0, 0, dsrl32_op), RT | RD | RE},
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[insn_dsbh] = {M(spec3_op, 0, 0, 0, dsbh_op, dbshfl_op), RT | RD},
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[insn_dshd] = {M(spec3_op, 0, 0, 0, dshd_op, dbshfl_op), RT | RD},
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[insn_dsll] = {M(spec_op, 0, 0, 0, 0, dsll_op), RT | RD | RE},
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[insn_dsll32] = {M(spec_op, 0, 0, 0, 0, dsll32_op), RT | RD | RE},
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[insn_dsllv] = {M(spec_op, 0, 0, 0, 0, dsllv_op), RS | RT | RD},
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[insn_dsra] = {M(spec_op, 0, 0, 0, 0, dsra_op), RT | RD | RE},
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[insn_dsra32] = {M(spec_op, 0, 0, 0, 0, dsra32_op), RT | RD | RE},
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[insn_dsrav] = {M(spec_op, 0, 0, 0, 0, dsrav_op), RS | RT | RD},
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[insn_dsrl] = {M(spec_op, 0, 0, 0, 0, dsrl_op), RT | RD | RE},
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[insn_dsrl32] = {M(spec_op, 0, 0, 0, 0, dsrl32_op), RT | RD | RE},
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[insn_dsrlv] = {M(spec_op, 0, 0, 0, 0, dsrlv_op), RS | RT | RD},
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[insn_dsubu] = {M(spec_op, 0, 0, 0, 0, dsubu_op), RS | RT | RD},
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[insn_eret] = {M(cop0_op, cop_op, 0, 0, 0, eret_op), 0},
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[insn_ext] = {M(spec3_op, 0, 0, 0, 0, ext_op), RS | RT | RD | RE},
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[insn_ins] = {M(spec3_op, 0, 0, 0, 0, ins_op), RS | RT | RD | RE},
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[insn_j] = {M(j_op, 0, 0, 0, 0, 0), JIMM},
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[insn_jal] = {M(jal_op, 0, 0, 0, 0, 0), JIMM},
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[insn_jalr] = {M(spec_op, 0, 0, 0, 0, jalr_op), RS | RD},
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#ifndef CONFIG_CPU_MIPSR6
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[insn_jr] = {M(spec_op, 0, 0, 0, 0, jr_op), RS},
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#else
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[insn_jr] = {M(spec_op, 0, 0, 0, 0, jalr_op), RS},
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#endif
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[insn_lb] = {M(lb_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_lbu] = {M(lbu_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_ld] = {M(ld_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_lddir] = {M(lwc2_op, 0, 0, 0, lddir_op, mult_op), RS | RT | RD},
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[insn_ldpte] = {M(lwc2_op, 0, 0, 0, ldpte_op, mult_op), RS | RD},
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[insn_ldx] = {M(spec3_op, 0, 0, 0, ldx_op, lx_op), RS | RT | RD},
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[insn_lh] = {M(lh_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_lhu] = {M(lhu_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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#ifndef CONFIG_CPU_MIPSR6
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[insn_ll] = {M(ll_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_lld] = {M(lld_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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#else
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[insn_ll] = {M6(spec3_op, 0, 0, 0, ll6_op), RS | RT | SIMM9},
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[insn_lld] = {M6(spec3_op, 0, 0, 0, lld6_op), RS | RT | SIMM9},
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#endif
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[insn_lui] = {M(lui_op, 0, 0, 0, 0, 0), RT | SIMM},
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[insn_lw] = {M(lw_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_lwu] = {M(lwu_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_lwx] = {M(spec3_op, 0, 0, 0, lwx_op, lx_op), RS | RT | RD},
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[insn_mfc0] = {M(cop0_op, mfc_op, 0, 0, 0, 0), RT | RD | SET},
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[insn_mfhc0] = {M(cop0_op, mfhc0_op, 0, 0, 0, 0), RT | RD | SET},
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[insn_mfhi] = {M(spec_op, 0, 0, 0, 0, mfhi_op), RD},
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[insn_mflo] = {M(spec_op, 0, 0, 0, 0, mflo_op), RD},
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[insn_modu] = {M(spec_op, 0, 0, 0, divu_modu_op, divu_op),
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RS | RT | RD},
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[insn_movn] = {M(spec_op, 0, 0, 0, 0, movn_op), RS | RT | RD},
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[insn_movz] = {M(spec_op, 0, 0, 0, 0, movz_op), RS | RT | RD},
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[insn_mtc0] = {M(cop0_op, mtc_op, 0, 0, 0, 0), RT | RD | SET},
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[insn_mthc0] = {M(cop0_op, mthc0_op, 0, 0, 0, 0), RT | RD | SET},
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[insn_mthi] = {M(spec_op, 0, 0, 0, 0, mthi_op), RS},
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[insn_mtlo] = {M(spec_op, 0, 0, 0, 0, mtlo_op), RS},
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[insn_mulu] = {M(spec_op, 0, 0, 0, multu_mulu_op, multu_op),
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RS | RT | RD},
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[insn_muhu] = {M(spec_op, 0, 0, 0, multu_muhu_op, multu_op),
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RS | RT | RD},
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#ifndef CONFIG_CPU_MIPSR6
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[insn_mul] = {M(spec2_op, 0, 0, 0, 0, mul_op), RS | RT | RD},
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#else
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[insn_mul] = {M(spec_op, 0, 0, 0, mult_mul_op, mult_op), RS | RT | RD},
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#endif
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[insn_multu] = {M(spec_op, 0, 0, 0, 0, multu_op), RS | RT},
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[insn_nor] = {M(spec_op, 0, 0, 0, 0, nor_op), RS | RT | RD},
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[insn_or] = {M(spec_op, 0, 0, 0, 0, or_op), RS | RT | RD},
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[insn_ori] = {M(ori_op, 0, 0, 0, 0, 0), RS | RT | UIMM},
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#ifndef CONFIG_CPU_MIPSR6
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[insn_pref] = {M(pref_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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#else
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[insn_pref] = {M6(spec3_op, 0, 0, 0, pref6_op), RS | RT | SIMM9},
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#endif
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[insn_rfe] = {M(cop0_op, cop_op, 0, 0, 0, rfe_op), 0},
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[insn_rotr] = {M(spec_op, 1, 0, 0, 0, srl_op), RT | RD | RE},
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[insn_sb] = {M(sb_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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#ifndef CONFIG_CPU_MIPSR6
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[insn_sc] = {M(sc_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_scd] = {M(scd_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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#else
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[insn_sc] = {M6(spec3_op, 0, 0, 0, sc6_op), RS | RT | SIMM9},
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[insn_scd] = {M6(spec3_op, 0, 0, 0, scd6_op), RS | RT | SIMM9},
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#endif
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[insn_sd] = {M(sd_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_seleqz] = {M(spec_op, 0, 0, 0, 0, seleqz_op), RS | RT | RD},
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[insn_selnez] = {M(spec_op, 0, 0, 0, 0, selnez_op), RS | RT | RD},
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[insn_sh] = {M(sh_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_sll] = {M(spec_op, 0, 0, 0, 0, sll_op), RT | RD | RE},
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[insn_sllv] = {M(spec_op, 0, 0, 0, 0, sllv_op), RS | RT | RD},
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[insn_slt] = {M(spec_op, 0, 0, 0, 0, slt_op), RS | RT | RD},
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[insn_slti] = {M(slti_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_sltiu] = {M(sltiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_sltu] = {M(spec_op, 0, 0, 0, 0, sltu_op), RS | RT | RD},
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[insn_sra] = {M(spec_op, 0, 0, 0, 0, sra_op), RT | RD | RE},
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[insn_srav] = {M(spec_op, 0, 0, 0, 0, srav_op), RS | RT | RD},
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[insn_srl] = {M(spec_op, 0, 0, 0, 0, srl_op), RT | RD | RE},
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[insn_srlv] = {M(spec_op, 0, 0, 0, 0, srlv_op), RS | RT | RD},
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[insn_subu] = {M(spec_op, 0, 0, 0, 0, subu_op), RS | RT | RD},
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[insn_sw] = {M(sw_op, 0, 0, 0, 0, 0), RS | RT | SIMM},
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[insn_sync] = {M(spec_op, 0, 0, 0, 0, sync_op), RE},
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[insn_syscall] = {M(spec_op, 0, 0, 0, 0, syscall_op), SCIMM},
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[insn_tlbp] = {M(cop0_op, cop_op, 0, 0, 0, tlbp_op), 0},
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[insn_tlbr] = {M(cop0_op, cop_op, 0, 0, 0, tlbr_op), 0},
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[insn_tlbwi] = {M(cop0_op, cop_op, 0, 0, 0, tlbwi_op), 0},
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[insn_tlbwr] = {M(cop0_op, cop_op, 0, 0, 0, tlbwr_op), 0},
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[insn_wait] = {M(cop0_op, cop_op, 0, 0, 0, wait_op), SCIMM},
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[insn_wsbh] = {M(spec3_op, 0, 0, 0, wsbh_op, bshfl_op), RT | RD},
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[insn_xor] = {M(spec_op, 0, 0, 0, 0, xor_op), RS | RT | RD},
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[insn_xori] = {M(xori_op, 0, 0, 0, 0, 0), RS | RT | UIMM},
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[insn_yield] = {M(spec3_op, 0, 0, 0, 0, yield_op), RS | RD},
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};
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#undef M
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static inline u32 build_bimm(s32 arg)
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{
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WARN(arg > 0x1ffff || arg < -0x20000,
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KERN_WARNING "Micro-assembler field overflow\n");
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WARN(arg & 0x3, KERN_WARNING "Invalid micro-assembler branch target\n");
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return ((arg < 0) ? (1 << 15) : 0) | ((arg >> 2) & 0x7fff);
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}
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static inline u32 build_jimm(u32 arg)
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{
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WARN(arg & ~(JIMM_MASK << 2),
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KERN_WARNING "Micro-assembler field overflow\n");
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return (arg >> 2) & JIMM_MASK;
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}
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/*
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* The order of opcode arguments is implicitly left to right,
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* starting with RS and ending with FUNC or IMM.
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*/
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static void build_insn(u32 **buf, enum opcode opc, ...)
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{
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const struct insn *ip;
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va_list ap;
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u32 op;
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if (opc < 0 || opc >= insn_invalid ||
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(opc == insn_daddiu && r4k_daddiu_bug()) ||
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(insn_table[opc].match == 0 && insn_table[opc].fields == 0))
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panic("Unsupported Micro-assembler instruction %d", opc);
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ip = &insn_table[opc];
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op = ip->match;
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va_start(ap, opc);
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if (ip->fields & RS)
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op |= build_rs(va_arg(ap, u32));
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if (ip->fields & RT)
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op |= build_rt(va_arg(ap, u32));
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if (ip->fields & RD)
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op |= build_rd(va_arg(ap, u32));
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if (ip->fields & RE)
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op |= build_re(va_arg(ap, u32));
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if (ip->fields & SIMM)
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op |= build_simm(va_arg(ap, s32));
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if (ip->fields & UIMM)
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op |= build_uimm(va_arg(ap, u32));
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if (ip->fields & BIMM)
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op |= build_bimm(va_arg(ap, s32));
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if (ip->fields & JIMM)
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op |= build_jimm(va_arg(ap, u32));
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if (ip->fields & FUNC)
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op |= build_func(va_arg(ap, u32));
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if (ip->fields & SET)
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op |= build_set(va_arg(ap, u32));
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if (ip->fields & SCIMM)
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op |= build_scimm(va_arg(ap, u32));
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if (ip->fields & SIMM9)
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op |= build_scimm9(va_arg(ap, u32));
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va_end(ap);
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**buf = op;
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(*buf)++;
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}
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static inline void
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__resolve_relocs(struct uasm_reloc *rel, struct uasm_label *lab)
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{
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long laddr = (long)lab->addr;
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long raddr = (long)rel->addr;
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switch (rel->type) {
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case R_MIPS_PC16:
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*rel->addr |= build_bimm(laddr - (raddr + 4));
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break;
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default:
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panic("Unsupported Micro-assembler relocation %d",
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rel->type);
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}
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}
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