arch/mips/mm/uasm.c - kernel/msm-4.19 - Gitiles

 /*
  * 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 <asm/uasm.h>

 enum fields {
 	RS = 0x001,
 	RT = 0x002,
 	RD = 0x004,
 	RE = 0x008,
 	SIMM = 0x010,
 	UIMM = 0x020,
 	BIMM = 0x040,
 	JIMM = 0x080,
 	FUNC = 0x100,
 	SET = 0x200,
 	SCIMM = 0x400
 };

 #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
 #define SCIMM_MASK	0xfffff
 #define SCIMM_SH	6

 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_drotr, 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_or, insn_ori, insn_pref, insn_rfe, insn_sc, insn_scd,
 	insn_sd, insn_sll, insn_sra, insn_srl, insn_rotr, insn_subu, insn_sw,
 	insn_tlbp, insn_tlbr, insn_tlbwi, insn_tlbwr, insn_xor, insn_xori,
 	insn_dins, insn_syscall
 };

 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_drotr, M(spec_op, 1, 0, 0, 0, dsrl_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_or,  M(spec_op, 0, 0, 0, 0, or_op),  RS | RT | RD },
 	{ 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_rotr,  M(spec_op, 1, 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_tlbr,  M(cop0_op, cop_op, 0, 0, 0, tlbr_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_dins, M(spec3_op, 0, 0, 0, 0, dins_op), RS | RT | RD | RE },
 	{ insn_syscall, M(spec_op, 0, 0, 0, 0, syscall_op), SCIMM},
 	{ 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_scimm(u32 arg)
 {
 	if (arg & ~SCIMM_MASK)
 		printk(KERN_WARNING "Micro-assembler field overflow\n");

 	return (arg & SCIMM_MASK) << SCIMM_SH;
 }

 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));
 	if (ip->fields & SCIMM)
 		op |= build_scimm(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_u2u1msbu3(op)					\
 Ip_u2u1msbu3(op)					\
 {							\
 	build_insn(buf, insn##op, b, a, c+d-1, 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_u2u1u3(_drotr)
 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_u3u1u2(_or)
 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_u2u1u3(_rotr)
 I_u3u1u2(_subu)
 I_u2s3u1(_sw)
 I_0(_tlbp)
 I_0(_tlbr)
 I_0(_tlbwi)
 I_0(_tlbwr)
 I_u3u1u2(_xor)
 I_u2u1u3(_xori)
 I_u2u1msbu3(_dins);
 I_u1(_syscall);

 /* 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);
 }
	/*
	* 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 <asm/uasm.h>

	enum fields {
	RS = 0x001,
	RT = 0x002,
	RD = 0x004,
	RE = 0x008,
	SIMM = 0x010,
	UIMM = 0x020,
	BIMM = 0x040,
	JIMM = 0x080,
	FUNC = 0x100,
	SET = 0x200,
	SCIMM = 0x400
	};

	#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
	#define SCIMM_MASK 0xfffff
	#define SCIMM_SH 6

	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_drotr, 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_or, insn_ori, insn_pref, insn_rfe, insn_sc, insn_scd,
	insn_sd, insn_sll, insn_sra, insn_srl, insn_rotr, insn_subu, insn_sw,
	insn_tlbp, insn_tlbr, insn_tlbwi, insn_tlbwr, insn_xor, insn_xori,
	insn_dins, insn_syscall
	};

	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_drotr, M(spec_op, 1, 0, 0, 0, dsrl_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_or, M(spec_op, 0, 0, 0, 0, or_op), RS \| RT \| RD },
	{ 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_rotr, M(spec_op, 1, 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_tlbr, M(cop0_op, cop_op, 0, 0, 0, tlbr_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_dins, M(spec3_op, 0, 0, 0, 0, dins_op), RS \| RT \| RD \| RE },
	{ insn_syscall, M(spec_op, 0, 0, 0, 0, syscall_op), SCIMM},
	{ 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_scimm(u32 arg)
	{
	if (arg & ~SCIMM_MASK)
	printk(KERN_WARNING "Micro-assembler field overflow\n");

	return (arg & SCIMM_MASK) << SCIMM_SH;
	}

	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));
	if (ip->fields & SCIMM)
	op \|= build_scimm(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_u2u1msbu3(op) \
	Ip_u2u1msbu3(op) \
	{ \
	build_insn(buf, insn##op, b, a, c+d-1, 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_u2u1u3(_drotr)
	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_u3u1u2(_or)
	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_u2u1u3(_rotr)
	I_u3u1u2(_subu)
	I_u2s3u1(_sw)
	I_0(_tlbp)
	I_0(_tlbr)
	I_0(_tlbwi)
	I_0(_tlbwr)
	I_u3u1u2(_xor)
	I_u2u1u3(_xori)
	I_u2u1msbu3(_dins);
	I_u1(_syscall);

	/* 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);
	}