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uasm.c

/*
 * 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)
 */

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

#include <asm/inst.h>
#include <asm/elf.h>
#include <asm/bugs.h>

#include "uasm.h"

enum fields {
      RS = 0x001,
      RT = 0x002,
      RD = 0x004,
      RE = 0x008,
      SIMM = 0x010,
      UIMM = 0x020,
      BIMM = 0x040,
      JIMM = 0x080,
      FUNC = 0x100,
      SET = 0x200
};

#define OP_MASK         0x3f
#define OP_SH           26
#define RS_MASK         0x1f
#define RS_SH           21
#define RT_MASK         0x1f
#define RT_SH           16
#define RD_MASK         0x1f
#define RD_SH           11
#define RE_MASK         0x1f
#define RE_SH           6
#define IMM_MASK  0xffff
#define IMM_SH          0
#define JIMM_MASK 0x3ffffff
#define JIMM_SH         0
#define FUNC_MASK 0x3f
#define FUNC_SH         0
#define SET_MASK  0x7
#define SET_SH          0

enum opcode {
      insn_invalid,
      insn_addu, insn_addiu, insn_and, insn_andi, insn_beq,
      insn_beql, insn_bgez, insn_bgezl, insn_bltz, insn_bltzl,
      insn_bne, insn_cache, insn_daddu, insn_daddiu, insn_dmfc0,
      insn_dmtc0, insn_dsll, insn_dsll32, insn_dsra, insn_dsrl,
      insn_dsrl32, insn_dsubu, insn_eret, insn_j, insn_jal, insn_jr,
      insn_ld, insn_ll, insn_lld, insn_lui, insn_lw, insn_mfc0,
      insn_mtc0, insn_ori, insn_pref, insn_rfe, insn_sc, insn_scd,
      insn_sd, insn_sll, insn_sra, insn_srl, insn_subu, insn_sw,
      insn_tlbp, insn_tlbwi, insn_tlbwr, insn_xor, insn_xori
};

struct insn {
      enum opcode opcode;
      u32 match;
      enum fields fields;
};

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

static struct insn insn_table[] __cpuinitdata = {
      { insn_addiu, M(addiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM },
      { insn_addu, M(spec_op, 0, 0, 0, 0, addu_op), RS | RT | RD },
      { insn_and, M(spec_op, 0, 0, 0, 0, and_op), RS | RT | RD },
      { insn_andi, M(andi_op, 0, 0, 0, 0, 0), RS | RT | UIMM },
      { insn_beq, M(beq_op, 0, 0, 0, 0, 0), RS | RT | BIMM },
      { insn_beql, M(beql_op, 0, 0, 0, 0, 0), RS | RT | BIMM },
      { insn_bgez, M(bcond_op, 0, bgez_op, 0, 0, 0), RS | BIMM },
      { insn_bgezl, M(bcond_op, 0, bgezl_op, 0, 0, 0), RS | BIMM },
      { insn_bltz, M(bcond_op, 0, bltz_op, 0, 0, 0), RS | BIMM },
      { insn_bltzl, M(bcond_op, 0, bltzl_op, 0, 0, 0), RS | BIMM },
      { insn_bne, M(bne_op, 0, 0, 0, 0, 0), RS | RT | BIMM },
      { insn_cache,  M(cache_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
      { insn_daddiu, M(daddiu_op, 0, 0, 0, 0, 0), RS | RT | SIMM },
      { insn_daddu, M(spec_op, 0, 0, 0, 0, daddu_op), RS | RT | RD },
      { insn_dmfc0, M(cop0_op, dmfc_op, 0, 0, 0, 0), RT | RD | SET},
      { insn_dmtc0, M(cop0_op, dmtc_op, 0, 0, 0, 0), RT | RD | SET},
      { insn_dsll, M(spec_op, 0, 0, 0, 0, dsll_op), RT | RD | RE },
      { insn_dsll32, M(spec_op, 0, 0, 0, 0, dsll32_op), RT | RD | RE },
      { insn_dsra, M(spec_op, 0, 0, 0, 0, dsra_op), RT | RD | RE },
      { insn_dsrl, M(spec_op, 0, 0, 0, 0, dsrl_op), RT | RD | RE },
      { insn_dsrl32, M(spec_op, 0, 0, 0, 0, dsrl32_op), RT | RD | RE },
      { insn_dsubu, M(spec_op, 0, 0, 0, 0, dsubu_op), RS | RT | RD },
      { insn_eret,  M(cop0_op, cop_op, 0, 0, 0, eret_op),  0 },
      { insn_j,  M(j_op, 0, 0, 0, 0, 0),  JIMM },
      { insn_jal,  M(jal_op, 0, 0, 0, 0, 0),  JIMM },
      { insn_jr,  M(spec_op, 0, 0, 0, 0, jr_op),  RS },
      { insn_ld,  M(ld_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
      { insn_ll,  M(ll_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
      { insn_lld,  M(lld_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
      { insn_lui,  M(lui_op, 0, 0, 0, 0, 0),  RT | SIMM },
      { insn_lw,  M(lw_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
      { insn_mfc0,  M(cop0_op, mfc_op, 0, 0, 0, 0),  RT | RD | SET},
      { insn_mtc0,  M(cop0_op, mtc_op, 0, 0, 0, 0),  RT | RD | SET},
      { insn_ori,  M(ori_op, 0, 0, 0, 0, 0),  RS | RT | UIMM },
      { insn_pref,  M(pref_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
      { insn_rfe,  M(cop0_op, cop_op, 0, 0, 0, rfe_op),  0 },
      { insn_sc,  M(sc_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
      { insn_scd,  M(scd_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
      { insn_sd,  M(sd_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
      { insn_sll,  M(spec_op, 0, 0, 0, 0, sll_op),  RT | RD | RE },
      { insn_sra,  M(spec_op, 0, 0, 0, 0, sra_op),  RT | RD | RE },
      { insn_srl,  M(spec_op, 0, 0, 0, 0, srl_op),  RT | RD | RE },
      { insn_subu,  M(spec_op, 0, 0, 0, 0, subu_op),  RS | RT | RD },
      { insn_sw,  M(sw_op, 0, 0, 0, 0, 0),  RS | RT | SIMM },
      { insn_tlbp,  M(cop0_op, cop_op, 0, 0, 0, tlbp_op),  0 },
      { insn_tlbwi,  M(cop0_op, cop_op, 0, 0, 0, tlbwi_op),  0 },
      { insn_tlbwr,  M(cop0_op, cop_op, 0, 0, 0, tlbwr_op),  0 },
      { insn_xor,  M(spec_op, 0, 0, 0, 0, xor_op),  RS | RT | RD },
      { insn_xori,  M(xori_op, 0, 0, 0, 0, 0),  RS | RT | UIMM },
      { insn_invalid, 0, 0 }
};

#undef M

static inline __cpuinit u32 build_rs(u32 arg)
{
      if (arg & ~RS_MASK)
            printk(KERN_WARNING "Micro-assembler field overflow\n");

      return (arg & RS_MASK) << RS_SH;
}

static inline __cpuinit u32 build_rt(u32 arg)
{
      if (arg & ~RT_MASK)
            printk(KERN_WARNING "Micro-assembler field overflow\n");

      return (arg & RT_MASK) << RT_SH;
}

static inline __cpuinit u32 build_rd(u32 arg)
{
      if (arg & ~RD_MASK)
            printk(KERN_WARNING "Micro-assembler field overflow\n");

      return (arg & RD_MASK) << RD_SH;
}

static inline __cpuinit u32 build_re(u32 arg)
{
      if (arg & ~RE_MASK)
            printk(KERN_WARNING "Micro-assembler field overflow\n");

      return (arg & RE_MASK) << RE_SH;
}

static inline __cpuinit u32 build_simm(s32 arg)
{
      if (arg > 0x7fff || arg < -0x8000)
            printk(KERN_WARNING "Micro-assembler field overflow\n");

      return arg & 0xffff;
}

static inline __cpuinit u32 build_uimm(u32 arg)
{
      if (arg & ~IMM_MASK)
            printk(KERN_WARNING "Micro-assembler field overflow\n");

      return arg & IMM_MASK;
}

static inline __cpuinit u32 build_bimm(s32 arg)
{
      if (arg > 0x1ffff || arg < -0x20000)
            printk(KERN_WARNING "Micro-assembler field overflow\n");

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

      return ((arg < 0) ? (1 << 15) : 0) | ((arg >> 2) & 0x7fff);
}

static inline __cpuinit u32 build_jimm(u32 arg)
{
      if (arg & ~((JIMM_MASK) << 2))
            printk(KERN_WARNING "Micro-assembler field overflow\n");

      return (arg >> 2) & JIMM_MASK;
}

static inline __cpuinit u32 build_func(u32 arg)
{
      if (arg & ~FUNC_MASK)
            printk(KERN_WARNING "Micro-assembler field overflow\n");

      return arg & FUNC_MASK;
}

static inline __cpuinit u32 build_set(u32 arg)
{
      if (arg & ~SET_MASK)
            printk(KERN_WARNING "Micro-assembler field overflow\n");

      return arg & SET_MASK;
}

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

      for (i = 0; insn_table[i].opcode != insn_invalid; i++)
            if (insn_table[i].opcode == opc) {
                  ip = &insn_table[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)
            op |= build_rs(va_arg(ap, u32));
      if (ip->fields & RT)
            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));
      va_end(ap);

      **buf = op;
      (*buf)++;
}

#define I_u1u2u3(op)                            \
Ip_u1u2u3(op)                                   \
{                                         \
      build_insn(buf, insn##op, a, b, c);       \
}

#define I_u2u1u3(op)                            \
Ip_u2u1u3(op)                                   \
{                                         \
      build_insn(buf, insn##op, b, a, c);       \
}

#define I_u3u1u2(op)                            \
Ip_u3u1u2(op)                                   \
{                                         \
      build_insn(buf, insn##op, b, c, a);       \
}

#define I_u1u2s3(op)                            \
Ip_u1u2s3(op)                                   \
{                                         \
      build_insn(buf, insn##op, a, b, c);       \
}

#define I_u2s3u1(op)                            \
Ip_u2s3u1(op)                                   \
{                                         \
      build_insn(buf, insn##op, c, a, b);       \
}

#define I_u2u1s3(op)                            \
Ip_u2u1s3(op)                                   \
{                                         \
      build_insn(buf, insn##op, b, a, c);       \
}

#define I_u1u2(op)                              \
Ip_u1u2(op)                               \
{                                         \
      build_insn(buf, insn##op, a, b);          \
}

#define I_u1s2(op)                              \
Ip_u1s2(op)                               \
{                                         \
      build_insn(buf, insn##op, a, b);          \
}

#define I_u1(op)                          \
Ip_u1(op)                                 \
{                                         \
      build_insn(buf, insn##op, a);             \
}

#define I_0(op)                                 \
Ip_0(op)                                  \
{                                         \
      build_insn(buf, insn##op);                \
}

I_u2u1s3(_addiu)
I_u3u1u2(_addu)
I_u2u1u3(_andi)
I_u3u1u2(_and)
I_u1u2s3(_beq)
I_u1u2s3(_beql)
I_u1s2(_bgez)
I_u1s2(_bgezl)
I_u1s2(_bltz)
I_u1s2(_bltzl)
I_u1u2s3(_bne)
I_u2s3u1(_cache)
I_u1u2u3(_dmfc0)
I_u1u2u3(_dmtc0)
I_u2u1s3(_daddiu)
I_u3u1u2(_daddu)
I_u2u1u3(_dsll)
I_u2u1u3(_dsll32)
I_u2u1u3(_dsra)
I_u2u1u3(_dsrl)
I_u2u1u3(_dsrl32)
I_u3u1u2(_dsubu)
I_0(_eret)
I_u1(_j)
I_u1(_jal)
I_u1(_jr)
I_u2s3u1(_ld)
I_u2s3u1(_ll)
I_u2s3u1(_lld)
I_u1s2(_lui)
I_u2s3u1(_lw)
I_u1u2u3(_mfc0)
I_u1u2u3(_mtc0)
I_u2u1u3(_ori)
I_u2s3u1(_pref)
I_0(_rfe)
I_u2s3u1(_sc)
I_u2s3u1(_scd)
I_u2s3u1(_sd)
I_u2u1u3(_sll)
I_u2u1u3(_sra)
I_u2u1u3(_srl)
I_u3u1u2(_subu)
I_u2s3u1(_sw)
I_0(_tlbp)
I_0(_tlbwi)
I_0(_tlbwr)
I_u3u1u2(_xor)
I_u2u1u3(_xori)

/* Handle labels. */
void __cpuinit uasm_build_label(struct uasm_label **lab, u32 *addr, int lid)
{
      (*lab)->addr = addr;
      (*lab)->lab = lid;
      (*lab)++;
}

int __cpuinit uasm_in_compat_space_p(long addr)
{
      /* Is this address in 32bit compat space? */
#ifdef CONFIG_64BIT
      return (((addr) & 0xffffffff00000000L) == 0xffffffff00000000L);
#else
      return 1;
#endif
}

static int __cpuinit uasm_rel_highest(long val)
{
#ifdef CONFIG_64BIT
      return ((((val + 0x800080008000L) >> 48) & 0xffff) ^ 0x8000) - 0x8000;
#else
      return 0;
#endif
}

static int __cpuinit uasm_rel_higher(long val)
{
#ifdef CONFIG_64BIT
      return ((((val + 0x80008000L) >> 32) & 0xffff) ^ 0x8000) - 0x8000;
#else
      return 0;
#endif
}

int __cpuinit uasm_rel_hi(long val)
{
      return ((((val + 0x8000L) >> 16) & 0xffff) ^ 0x8000) - 0x8000;
}

int __cpuinit uasm_rel_lo(long val)
{
      return ((val & 0xffff) ^ 0x8000) - 0x8000;
}

void __cpuinit UASM_i_LA_mostly(u32 **buf, unsigned int rs, long addr)
{
      if (!uasm_in_compat_space_p(addr)) {
            uasm_i_lui(buf, rs, uasm_rel_highest(addr));
            if (uasm_rel_higher(addr))
                  uasm_i_daddiu(buf, rs, rs, uasm_rel_higher(addr));
            if (uasm_rel_hi(addr)) {
                  uasm_i_dsll(buf, rs, rs, 16);
                  uasm_i_daddiu(buf, rs, rs, uasm_rel_hi(addr));
                  uasm_i_dsll(buf, rs, rs, 16);
            } else
                  uasm_i_dsll32(buf, rs, rs, 0);
      } else
            uasm_i_lui(buf, rs, uasm_rel_hi(addr));
}

void __cpuinit UASM_i_LA(u32 **buf, unsigned int rs, long addr)
{
      UASM_i_LA_mostly(buf, rs, addr);
      if (uasm_rel_lo(addr)) {
            if (!uasm_in_compat_space_p(addr))
                  uasm_i_daddiu(buf, rs, rs, uasm_rel_lo(addr));
            else
                  uasm_i_addiu(buf, rs, rs, uasm_rel_lo(addr));
      }
}

/* Handle relocations. */
void __cpuinit
uasm_r_mips_pc16(struct uasm_reloc **rel, u32 *addr, int lid)
{
      (*rel)->addr = addr;
      (*rel)->type = R_MIPS_PC16;
      (*rel)->lab = lid;
      (*rel)++;
}

static inline void __cpuinit
__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:
            *rel->addr |= build_bimm(laddr - (raddr + 4));
            break;

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

void __cpuinit
uasm_resolve_relocs(struct uasm_reloc *rel, struct uasm_label *lab)
{
      struct uasm_label *l;

      for (; rel->lab != UASM_LABEL_INVALID; rel++)
            for (l = lab; l->lab != UASM_LABEL_INVALID; l++)
                  if (rel->lab == l->lab)
                        __resolve_relocs(rel, l);
}

void __cpuinit
uasm_move_relocs(struct uasm_reloc *rel, u32 *first, u32 *end, long off)
{
      for (; rel->lab != UASM_LABEL_INVALID; rel++)
            if (rel->addr >= first && rel->addr < end)
                  rel->addr += off;
}

void __cpuinit
uasm_move_labels(struct uasm_label *lab, u32 *first, u32 *end, long off)
{
      for (; lab->lab != UASM_LABEL_INVALID; lab++)
            if (lab->addr >= first && lab->addr < end)
                  lab->addr += off;
}

void __cpuinit
uasm_copy_handler(struct uasm_reloc *rel, struct uasm_label *lab, u32 *first,
              u32 *end, u32 *target)
{
      long off = (long)(target - first);

      memcpy(target, first, (end - first) * sizeof(u32));

      uasm_move_relocs(rel, first, end, off);
      uasm_move_labels(lab, first, end, off);
}

int __cpuinit uasm_insn_has_bdelay(struct uasm_reloc *rel, u32 *addr)
{
      for (; rel->lab != UASM_LABEL_INVALID; rel++) {
            if (rel->addr == addr
                && (rel->type == R_MIPS_PC16
                  || rel->type == R_MIPS_26))
                  return 1;
      }

      return 0;
}

/* Convenience functions for labeled branches. */
void __cpuinit
uasm_il_bltz(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
{
      uasm_r_mips_pc16(r, *p, lid);
      uasm_i_bltz(p, reg, 0);
}

void __cpuinit
uasm_il_b(u32 **p, struct uasm_reloc **r, int lid)
{
      uasm_r_mips_pc16(r, *p, lid);
      uasm_i_b(p, 0);
}

void __cpuinit
uasm_il_beqz(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
{
      uasm_r_mips_pc16(r, *p, lid);
      uasm_i_beqz(p, reg, 0);
}

void __cpuinit
uasm_il_beqzl(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
{
      uasm_r_mips_pc16(r, *p, lid);
      uasm_i_beqzl(p, reg, 0);
}

void __cpuinit
uasm_il_bne(u32 **p, struct uasm_reloc **r, unsigned int reg1,
      unsigned int reg2, int lid)
{
      uasm_r_mips_pc16(r, *p, lid);
      uasm_i_bne(p, reg1, reg2, 0);
}

void __cpuinit
uasm_il_bnez(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
{
      uasm_r_mips_pc16(r, *p, lid);
      uasm_i_bnez(p, reg, 0);
}

void __cpuinit
uasm_il_bgezl(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
{
      uasm_r_mips_pc16(r, *p, lid);
      uasm_i_bgezl(p, reg, 0);
}

void __cpuinit
uasm_il_bgez(u32 **p, struct uasm_reloc **r, unsigned int reg, int lid)
{
      uasm_r_mips_pc16(r, *p, lid);
      uasm_i_bgez(p, reg, 0);
}

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