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Source file src/cmd/asm/internal/arch/arch.go

Documentation: cmd/asm/internal/arch

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  // Package arch defines architecture-specific information and support functions.
     6  package arch
     7  
     8  import (
     9  	"cmd/internal/obj"
    10  	"cmd/internal/obj/arm"
    11  	"cmd/internal/obj/arm64"
    12  	"cmd/internal/obj/mips"
    13  	"cmd/internal/obj/ppc64"
    14  	"cmd/internal/obj/riscv"
    15  	"cmd/internal/obj/s390x"
    16  	"cmd/internal/obj/wasm"
    17  	"cmd/internal/obj/x86"
    18  	"fmt"
    19  	"strings"
    20  )
    21  
    22  // Pseudo-registers whose names are the constant name without the leading R.
    23  const (
    24  	RFP = -(iota + 1)
    25  	RSB
    26  	RSP
    27  	RPC
    28  )
    29  
    30  // Arch wraps the link architecture object with more architecture-specific information.
    31  type Arch struct {
    32  	*obj.LinkArch
    33  	// Map of instruction names to enumeration.
    34  	Instructions map[string]obj.As
    35  	// Map of register names to enumeration.
    36  	Register map[string]int16
    37  	// Table of register prefix names. These are things like R for R(0) and SPR for SPR(268).
    38  	RegisterPrefix map[string]bool
    39  	// RegisterNumber converts R(10) into arm.REG_R10.
    40  	RegisterNumber func(string, int16) (int16, bool)
    41  	// Instruction is a jump.
    42  	IsJump func(word string) bool
    43  }
    44  
    45  // nilRegisterNumber is the register number function for architectures
    46  // that do not accept the R(N) notation. It always returns failure.
    47  func nilRegisterNumber(name string, n int16) (int16, bool) {
    48  	return 0, false
    49  }
    50  
    51  // Set configures the architecture specified by GOARCH and returns its representation.
    52  // It returns nil if GOARCH is not recognized.
    53  func Set(GOARCH string) *Arch {
    54  	switch GOARCH {
    55  	case "386":
    56  		return archX86(&x86.Link386)
    57  	case "amd64":
    58  		return archX86(&x86.Linkamd64)
    59  	case "arm":
    60  		return archArm()
    61  	case "arm64":
    62  		return archArm64()
    63  	case "mips":
    64  		return archMips(&mips.Linkmips)
    65  	case "mipsle":
    66  		return archMips(&mips.Linkmipsle)
    67  	case "mips64":
    68  		return archMips64(&mips.Linkmips64)
    69  	case "mips64le":
    70  		return archMips64(&mips.Linkmips64le)
    71  	case "ppc64":
    72  		return archPPC64(&ppc64.Linkppc64)
    73  	case "ppc64le":
    74  		return archPPC64(&ppc64.Linkppc64le)
    75  	case "riscv64":
    76  		return archRISCV64()
    77  	case "s390x":
    78  		return archS390x()
    79  	case "wasm":
    80  		return archWasm()
    81  	}
    82  	return nil
    83  }
    84  
    85  func jumpX86(word string) bool {
    86  	return word[0] == 'J' || word == "CALL" || strings.HasPrefix(word, "LOOP") || word == "XBEGIN"
    87  }
    88  
    89  func jumpRISCV(word string) bool {
    90  	switch word {
    91  	case "BEQ", "BEQZ", "BGE", "BGEU", "BGEZ", "BGT", "BGTU", "BGTZ", "BLE", "BLEU", "BLEZ",
    92  		"BLT", "BLTU", "BLTZ", "BNE", "BNEZ", "CALL", "JAL", "JALR", "JMP":
    93  		return true
    94  	}
    95  	return false
    96  }
    97  
    98  func jumpWasm(word string) bool {
    99  	return word == "JMP" || word == "CALL" || word == "Call" || word == "Br" || word == "BrIf"
   100  }
   101  
   102  func archX86(linkArch *obj.LinkArch) *Arch {
   103  	register := make(map[string]int16)
   104  	// Create maps for easy lookup of instruction names etc.
   105  	for i, s := range x86.Register {
   106  		register[s] = int16(i + x86.REG_AL)
   107  	}
   108  	// Pseudo-registers.
   109  	register["SB"] = RSB
   110  	register["FP"] = RFP
   111  	register["PC"] = RPC
   112  	// Register prefix not used on this architecture.
   113  
   114  	instructions := make(map[string]obj.As)
   115  	for i, s := range obj.Anames {
   116  		instructions[s] = obj.As(i)
   117  	}
   118  	for i, s := range x86.Anames {
   119  		if obj.As(i) >= obj.A_ARCHSPECIFIC {
   120  			instructions[s] = obj.As(i) + obj.ABaseAMD64
   121  		}
   122  	}
   123  	// Annoying aliases.
   124  	instructions["JA"] = x86.AJHI   /* alternate */
   125  	instructions["JAE"] = x86.AJCC  /* alternate */
   126  	instructions["JB"] = x86.AJCS   /* alternate */
   127  	instructions["JBE"] = x86.AJLS  /* alternate */
   128  	instructions["JC"] = x86.AJCS   /* alternate */
   129  	instructions["JCC"] = x86.AJCC  /* carry clear (CF = 0) */
   130  	instructions["JCS"] = x86.AJCS  /* carry set (CF = 1) */
   131  	instructions["JE"] = x86.AJEQ   /* alternate */
   132  	instructions["JEQ"] = x86.AJEQ  /* equal (ZF = 1) */
   133  	instructions["JG"] = x86.AJGT   /* alternate */
   134  	instructions["JGE"] = x86.AJGE  /* greater than or equal (signed) (SF = OF) */
   135  	instructions["JGT"] = x86.AJGT  /* greater than (signed) (ZF = 0 && SF = OF) */
   136  	instructions["JHI"] = x86.AJHI  /* higher (unsigned) (CF = 0 && ZF = 0) */
   137  	instructions["JHS"] = x86.AJCC  /* alternate */
   138  	instructions["JL"] = x86.AJLT   /* alternate */
   139  	instructions["JLE"] = x86.AJLE  /* less than or equal (signed) (ZF = 1 || SF != OF) */
   140  	instructions["JLO"] = x86.AJCS  /* alternate */
   141  	instructions["JLS"] = x86.AJLS  /* lower or same (unsigned) (CF = 1 || ZF = 1) */
   142  	instructions["JLT"] = x86.AJLT  /* less than (signed) (SF != OF) */
   143  	instructions["JMI"] = x86.AJMI  /* negative (minus) (SF = 1) */
   144  	instructions["JNA"] = x86.AJLS  /* alternate */
   145  	instructions["JNAE"] = x86.AJCS /* alternate */
   146  	instructions["JNB"] = x86.AJCC  /* alternate */
   147  	instructions["JNBE"] = x86.AJHI /* alternate */
   148  	instructions["JNC"] = x86.AJCC  /* alternate */
   149  	instructions["JNE"] = x86.AJNE  /* not equal (ZF = 0) */
   150  	instructions["JNG"] = x86.AJLE  /* alternate */
   151  	instructions["JNGE"] = x86.AJLT /* alternate */
   152  	instructions["JNL"] = x86.AJGE  /* alternate */
   153  	instructions["JNLE"] = x86.AJGT /* alternate */
   154  	instructions["JNO"] = x86.AJOC  /* alternate */
   155  	instructions["JNP"] = x86.AJPC  /* alternate */
   156  	instructions["JNS"] = x86.AJPL  /* alternate */
   157  	instructions["JNZ"] = x86.AJNE  /* alternate */
   158  	instructions["JO"] = x86.AJOS   /* alternate */
   159  	instructions["JOC"] = x86.AJOC  /* overflow clear (OF = 0) */
   160  	instructions["JOS"] = x86.AJOS  /* overflow set (OF = 1) */
   161  	instructions["JP"] = x86.AJPS   /* alternate */
   162  	instructions["JPC"] = x86.AJPC  /* parity clear (PF = 0) */
   163  	instructions["JPE"] = x86.AJPS  /* alternate */
   164  	instructions["JPL"] = x86.AJPL  /* non-negative (plus) (SF = 0) */
   165  	instructions["JPO"] = x86.AJPC  /* alternate */
   166  	instructions["JPS"] = x86.AJPS  /* parity set (PF = 1) */
   167  	instructions["JS"] = x86.AJMI   /* alternate */
   168  	instructions["JZ"] = x86.AJEQ   /* alternate */
   169  	instructions["MASKMOVDQU"] = x86.AMASKMOVOU
   170  	instructions["MOVD"] = x86.AMOVQ
   171  	instructions["MOVDQ2Q"] = x86.AMOVQ
   172  	instructions["MOVNTDQ"] = x86.AMOVNTO
   173  	instructions["MOVOA"] = x86.AMOVO
   174  	instructions["PSLLDQ"] = x86.APSLLO
   175  	instructions["PSRLDQ"] = x86.APSRLO
   176  	instructions["PADDD"] = x86.APADDL
   177  
   178  	return &Arch{
   179  		LinkArch:       linkArch,
   180  		Instructions:   instructions,
   181  		Register:       register,
   182  		RegisterPrefix: nil,
   183  		RegisterNumber: nilRegisterNumber,
   184  		IsJump:         jumpX86,
   185  	}
   186  }
   187  
   188  func archArm() *Arch {
   189  	register := make(map[string]int16)
   190  	// Create maps for easy lookup of instruction names etc.
   191  	// Note that there is no list of names as there is for x86.
   192  	for i := arm.REG_R0; i < arm.REG_SPSR; i++ {
   193  		register[obj.Rconv(i)] = int16(i)
   194  	}
   195  	// Avoid unintentionally clobbering g using R10.
   196  	delete(register, "R10")
   197  	register["g"] = arm.REG_R10
   198  	for i := 0; i < 16; i++ {
   199  		register[fmt.Sprintf("C%d", i)] = int16(i)
   200  	}
   201  
   202  	// Pseudo-registers.
   203  	register["SB"] = RSB
   204  	register["FP"] = RFP
   205  	register["PC"] = RPC
   206  	register["SP"] = RSP
   207  	registerPrefix := map[string]bool{
   208  		"F": true,
   209  		"R": true,
   210  	}
   211  
   212  	// special operands for DMB/DSB instructions
   213  	register["MB_SY"] = arm.REG_MB_SY
   214  	register["MB_ST"] = arm.REG_MB_ST
   215  	register["MB_ISH"] = arm.REG_MB_ISH
   216  	register["MB_ISHST"] = arm.REG_MB_ISHST
   217  	register["MB_NSH"] = arm.REG_MB_NSH
   218  	register["MB_NSHST"] = arm.REG_MB_NSHST
   219  	register["MB_OSH"] = arm.REG_MB_OSH
   220  	register["MB_OSHST"] = arm.REG_MB_OSHST
   221  
   222  	instructions := make(map[string]obj.As)
   223  	for i, s := range obj.Anames {
   224  		instructions[s] = obj.As(i)
   225  	}
   226  	for i, s := range arm.Anames {
   227  		if obj.As(i) >= obj.A_ARCHSPECIFIC {
   228  			instructions[s] = obj.As(i) + obj.ABaseARM
   229  		}
   230  	}
   231  	// Annoying aliases.
   232  	instructions["B"] = obj.AJMP
   233  	instructions["BL"] = obj.ACALL
   234  	// MCR differs from MRC by the way fields of the word are encoded.
   235  	// (Details in arm.go). Here we add the instruction so parse will find
   236  	// it, but give it an opcode number known only to us.
   237  	instructions["MCR"] = aMCR
   238  
   239  	return &Arch{
   240  		LinkArch:       &arm.Linkarm,
   241  		Instructions:   instructions,
   242  		Register:       register,
   243  		RegisterPrefix: registerPrefix,
   244  		RegisterNumber: armRegisterNumber,
   245  		IsJump:         jumpArm,
   246  	}
   247  }
   248  
   249  func archArm64() *Arch {
   250  	register := make(map[string]int16)
   251  	// Create maps for easy lookup of instruction names etc.
   252  	// Note that there is no list of names as there is for 386 and amd64.
   253  	register[obj.Rconv(arm64.REGSP)] = int16(arm64.REGSP)
   254  	for i := arm64.REG_R0; i <= arm64.REG_R31; i++ {
   255  		register[obj.Rconv(i)] = int16(i)
   256  	}
   257  	// Rename R18 to R18_PLATFORM to avoid accidental use.
   258  	register["R18_PLATFORM"] = register["R18"]
   259  	delete(register, "R18")
   260  	for i := arm64.REG_F0; i <= arm64.REG_F31; i++ {
   261  		register[obj.Rconv(i)] = int16(i)
   262  	}
   263  	for i := arm64.REG_V0; i <= arm64.REG_V31; i++ {
   264  		register[obj.Rconv(i)] = int16(i)
   265  	}
   266  
   267  	// System registers.
   268  	for i := 0; i < len(arm64.SystemReg); i++ {
   269  		register[arm64.SystemReg[i].Name] = arm64.SystemReg[i].Reg
   270  	}
   271  
   272  	register["LR"] = arm64.REGLINK
   273  	register["DAIFSet"] = arm64.REG_DAIFSet
   274  	register["DAIFClr"] = arm64.REG_DAIFClr
   275  	register["PLDL1KEEP"] = arm64.REG_PLDL1KEEP
   276  	register["PLDL1STRM"] = arm64.REG_PLDL1STRM
   277  	register["PLDL2KEEP"] = arm64.REG_PLDL2KEEP
   278  	register["PLDL2STRM"] = arm64.REG_PLDL2STRM
   279  	register["PLDL3KEEP"] = arm64.REG_PLDL3KEEP
   280  	register["PLDL3STRM"] = arm64.REG_PLDL3STRM
   281  	register["PLIL1KEEP"] = arm64.REG_PLIL1KEEP
   282  	register["PLIL1STRM"] = arm64.REG_PLIL1STRM
   283  	register["PLIL2KEEP"] = arm64.REG_PLIL2KEEP
   284  	register["PLIL2STRM"] = arm64.REG_PLIL2STRM
   285  	register["PLIL3KEEP"] = arm64.REG_PLIL3KEEP
   286  	register["PLIL3STRM"] = arm64.REG_PLIL3STRM
   287  	register["PSTL1KEEP"] = arm64.REG_PSTL1KEEP
   288  	register["PSTL1STRM"] = arm64.REG_PSTL1STRM
   289  	register["PSTL2KEEP"] = arm64.REG_PSTL2KEEP
   290  	register["PSTL2STRM"] = arm64.REG_PSTL2STRM
   291  	register["PSTL3KEEP"] = arm64.REG_PSTL3KEEP
   292  	register["PSTL3STRM"] = arm64.REG_PSTL3STRM
   293  
   294  	// Conditional operators, like EQ, NE, etc.
   295  	register["EQ"] = arm64.COND_EQ
   296  	register["NE"] = arm64.COND_NE
   297  	register["HS"] = arm64.COND_HS
   298  	register["CS"] = arm64.COND_HS
   299  	register["LO"] = arm64.COND_LO
   300  	register["CC"] = arm64.COND_LO
   301  	register["MI"] = arm64.COND_MI
   302  	register["PL"] = arm64.COND_PL
   303  	register["VS"] = arm64.COND_VS
   304  	register["VC"] = arm64.COND_VC
   305  	register["HI"] = arm64.COND_HI
   306  	register["LS"] = arm64.COND_LS
   307  	register["GE"] = arm64.COND_GE
   308  	register["LT"] = arm64.COND_LT
   309  	register["GT"] = arm64.COND_GT
   310  	register["LE"] = arm64.COND_LE
   311  	register["AL"] = arm64.COND_AL
   312  	register["NV"] = arm64.COND_NV
   313  	// Pseudo-registers.
   314  	register["SB"] = RSB
   315  	register["FP"] = RFP
   316  	register["PC"] = RPC
   317  	register["SP"] = RSP
   318  	// Avoid unintentionally clobbering g using R28.
   319  	delete(register, "R28")
   320  	register["g"] = arm64.REG_R28
   321  	registerPrefix := map[string]bool{
   322  		"F": true,
   323  		"R": true,
   324  		"V": true,
   325  	}
   326  
   327  	instructions := make(map[string]obj.As)
   328  	for i, s := range obj.Anames {
   329  		instructions[s] = obj.As(i)
   330  	}
   331  	for i, s := range arm64.Anames {
   332  		if obj.As(i) >= obj.A_ARCHSPECIFIC {
   333  			instructions[s] = obj.As(i) + obj.ABaseARM64
   334  		}
   335  	}
   336  	// Annoying aliases.
   337  	instructions["B"] = arm64.AB
   338  	instructions["BL"] = arm64.ABL
   339  
   340  	return &Arch{
   341  		LinkArch:       &arm64.Linkarm64,
   342  		Instructions:   instructions,
   343  		Register:       register,
   344  		RegisterPrefix: registerPrefix,
   345  		RegisterNumber: arm64RegisterNumber,
   346  		IsJump:         jumpArm64,
   347  	}
   348  
   349  }
   350  
   351  func archPPC64(linkArch *obj.LinkArch) *Arch {
   352  	register := make(map[string]int16)
   353  	// Create maps for easy lookup of instruction names etc.
   354  	// Note that there is no list of names as there is for x86.
   355  	for i := ppc64.REG_R0; i <= ppc64.REG_R31; i++ {
   356  		register[obj.Rconv(i)] = int16(i)
   357  	}
   358  	for i := ppc64.REG_F0; i <= ppc64.REG_F31; i++ {
   359  		register[obj.Rconv(i)] = int16(i)
   360  	}
   361  	for i := ppc64.REG_V0; i <= ppc64.REG_V31; i++ {
   362  		register[obj.Rconv(i)] = int16(i)
   363  	}
   364  	for i := ppc64.REG_VS0; i <= ppc64.REG_VS63; i++ {
   365  		register[obj.Rconv(i)] = int16(i)
   366  	}
   367  	for i := ppc64.REG_CR0; i <= ppc64.REG_CR7; i++ {
   368  		register[obj.Rconv(i)] = int16(i)
   369  	}
   370  	for i := ppc64.REG_MSR; i <= ppc64.REG_CR; i++ {
   371  		register[obj.Rconv(i)] = int16(i)
   372  	}
   373  	register["CR"] = ppc64.REG_CR
   374  	register["XER"] = ppc64.REG_XER
   375  	register["LR"] = ppc64.REG_LR
   376  	register["CTR"] = ppc64.REG_CTR
   377  	register["FPSCR"] = ppc64.REG_FPSCR
   378  	register["MSR"] = ppc64.REG_MSR
   379  	// Pseudo-registers.
   380  	register["SB"] = RSB
   381  	register["FP"] = RFP
   382  	register["PC"] = RPC
   383  	// Avoid unintentionally clobbering g using R30.
   384  	delete(register, "R30")
   385  	register["g"] = ppc64.REG_R30
   386  	registerPrefix := map[string]bool{
   387  		"CR":  true,
   388  		"F":   true,
   389  		"R":   true,
   390  		"SPR": true,
   391  	}
   392  
   393  	instructions := make(map[string]obj.As)
   394  	for i, s := range obj.Anames {
   395  		instructions[s] = obj.As(i)
   396  	}
   397  	for i, s := range ppc64.Anames {
   398  		if obj.As(i) >= obj.A_ARCHSPECIFIC {
   399  			instructions[s] = obj.As(i) + obj.ABasePPC64
   400  		}
   401  	}
   402  	// Annoying aliases.
   403  	instructions["BR"] = ppc64.ABR
   404  	instructions["BL"] = ppc64.ABL
   405  
   406  	return &Arch{
   407  		LinkArch:       linkArch,
   408  		Instructions:   instructions,
   409  		Register:       register,
   410  		RegisterPrefix: registerPrefix,
   411  		RegisterNumber: ppc64RegisterNumber,
   412  		IsJump:         jumpPPC64,
   413  	}
   414  }
   415  
   416  func archMips(linkArch *obj.LinkArch) *Arch {
   417  	register := make(map[string]int16)
   418  	// Create maps for easy lookup of instruction names etc.
   419  	// Note that there is no list of names as there is for x86.
   420  	for i := mips.REG_R0; i <= mips.REG_R31; i++ {
   421  		register[obj.Rconv(i)] = int16(i)
   422  	}
   423  
   424  	for i := mips.REG_F0; i <= mips.REG_F31; i++ {
   425  		register[obj.Rconv(i)] = int16(i)
   426  	}
   427  	for i := mips.REG_M0; i <= mips.REG_M31; i++ {
   428  		register[obj.Rconv(i)] = int16(i)
   429  	}
   430  	for i := mips.REG_FCR0; i <= mips.REG_FCR31; i++ {
   431  		register[obj.Rconv(i)] = int16(i)
   432  	}
   433  	register["HI"] = mips.REG_HI
   434  	register["LO"] = mips.REG_LO
   435  	// Pseudo-registers.
   436  	register["SB"] = RSB
   437  	register["FP"] = RFP
   438  	register["PC"] = RPC
   439  	// Avoid unintentionally clobbering g using R30.
   440  	delete(register, "R30")
   441  	register["g"] = mips.REG_R30
   442  
   443  	registerPrefix := map[string]bool{
   444  		"F":   true,
   445  		"FCR": true,
   446  		"M":   true,
   447  		"R":   true,
   448  	}
   449  
   450  	instructions := make(map[string]obj.As)
   451  	for i, s := range obj.Anames {
   452  		instructions[s] = obj.As(i)
   453  	}
   454  	for i, s := range mips.Anames {
   455  		if obj.As(i) >= obj.A_ARCHSPECIFIC {
   456  			instructions[s] = obj.As(i) + obj.ABaseMIPS
   457  		}
   458  	}
   459  	// Annoying alias.
   460  	instructions["JAL"] = mips.AJAL
   461  
   462  	return &Arch{
   463  		LinkArch:       linkArch,
   464  		Instructions:   instructions,
   465  		Register:       register,
   466  		RegisterPrefix: registerPrefix,
   467  		RegisterNumber: mipsRegisterNumber,
   468  		IsJump:         jumpMIPS,
   469  	}
   470  }
   471  
   472  func archMips64(linkArch *obj.LinkArch) *Arch {
   473  	register := make(map[string]int16)
   474  	// Create maps for easy lookup of instruction names etc.
   475  	// Note that there is no list of names as there is for x86.
   476  	for i := mips.REG_R0; i <= mips.REG_R31; i++ {
   477  		register[obj.Rconv(i)] = int16(i)
   478  	}
   479  	for i := mips.REG_F0; i <= mips.REG_F31; i++ {
   480  		register[obj.Rconv(i)] = int16(i)
   481  	}
   482  	for i := mips.REG_M0; i <= mips.REG_M31; i++ {
   483  		register[obj.Rconv(i)] = int16(i)
   484  	}
   485  	for i := mips.REG_FCR0; i <= mips.REG_FCR31; i++ {
   486  		register[obj.Rconv(i)] = int16(i)
   487  	}
   488  	for i := mips.REG_W0; i <= mips.REG_W31; i++ {
   489  		register[obj.Rconv(i)] = int16(i)
   490  	}
   491  	register["HI"] = mips.REG_HI
   492  	register["LO"] = mips.REG_LO
   493  	// Pseudo-registers.
   494  	register["SB"] = RSB
   495  	register["FP"] = RFP
   496  	register["PC"] = RPC
   497  	// Avoid unintentionally clobbering g using R30.
   498  	delete(register, "R30")
   499  	register["g"] = mips.REG_R30
   500  	// Avoid unintentionally clobbering RSB using R28.
   501  	delete(register, "R28")
   502  	register["RSB"] = mips.REG_R28
   503  	registerPrefix := map[string]bool{
   504  		"F":   true,
   505  		"FCR": true,
   506  		"M":   true,
   507  		"R":   true,
   508  		"W":   true,
   509  	}
   510  
   511  	instructions := make(map[string]obj.As)
   512  	for i, s := range obj.Anames {
   513  		instructions[s] = obj.As(i)
   514  	}
   515  	for i, s := range mips.Anames {
   516  		if obj.As(i) >= obj.A_ARCHSPECIFIC {
   517  			instructions[s] = obj.As(i) + obj.ABaseMIPS
   518  		}
   519  	}
   520  	// Annoying alias.
   521  	instructions["JAL"] = mips.AJAL
   522  
   523  	return &Arch{
   524  		LinkArch:       linkArch,
   525  		Instructions:   instructions,
   526  		Register:       register,
   527  		RegisterPrefix: registerPrefix,
   528  		RegisterNumber: mipsRegisterNumber,
   529  		IsJump:         jumpMIPS,
   530  	}
   531  }
   532  
   533  func archRISCV64() *Arch {
   534  	register := make(map[string]int16)
   535  
   536  	// Standard register names.
   537  	for i := riscv.REG_X0; i <= riscv.REG_X31; i++ {
   538  		if i == riscv.REG_G {
   539  			continue
   540  		}
   541  		name := fmt.Sprintf("X%d", i-riscv.REG_X0)
   542  		register[name] = int16(i)
   543  	}
   544  	for i := riscv.REG_F0; i <= riscv.REG_F31; i++ {
   545  		name := fmt.Sprintf("F%d", i-riscv.REG_F0)
   546  		register[name] = int16(i)
   547  	}
   548  
   549  	// General registers with ABI names.
   550  	register["ZERO"] = riscv.REG_ZERO
   551  	register["RA"] = riscv.REG_RA
   552  	register["SP"] = riscv.REG_SP
   553  	register["GP"] = riscv.REG_GP
   554  	register["TP"] = riscv.REG_TP
   555  	register["T0"] = riscv.REG_T0
   556  	register["T1"] = riscv.REG_T1
   557  	register["T2"] = riscv.REG_T2
   558  	register["S0"] = riscv.REG_S0
   559  	register["S1"] = riscv.REG_S1
   560  	register["A0"] = riscv.REG_A0
   561  	register["A1"] = riscv.REG_A1
   562  	register["A2"] = riscv.REG_A2
   563  	register["A3"] = riscv.REG_A3
   564  	register["A4"] = riscv.REG_A4
   565  	register["A5"] = riscv.REG_A5
   566  	register["A6"] = riscv.REG_A6
   567  	register["A7"] = riscv.REG_A7
   568  	register["S2"] = riscv.REG_S2
   569  	register["S3"] = riscv.REG_S3
   570  	register["S4"] = riscv.REG_S4
   571  	register["S5"] = riscv.REG_S5
   572  	register["S6"] = riscv.REG_S6
   573  	register["S7"] = riscv.REG_S7
   574  	register["S8"] = riscv.REG_S8
   575  	register["S9"] = riscv.REG_S9
   576  	register["S10"] = riscv.REG_S10
   577  	// Skip S11 as it is the g register.
   578  	register["T3"] = riscv.REG_T3
   579  	register["T4"] = riscv.REG_T4
   580  	register["T5"] = riscv.REG_T5
   581  	register["T6"] = riscv.REG_T6
   582  
   583  	// Go runtime register names.
   584  	register["g"] = riscv.REG_G
   585  	register["CTXT"] = riscv.REG_CTXT
   586  	register["TMP"] = riscv.REG_TMP
   587  
   588  	// ABI names for floating point register.
   589  	register["FT0"] = riscv.REG_FT0
   590  	register["FT1"] = riscv.REG_FT1
   591  	register["FT2"] = riscv.REG_FT2
   592  	register["FT3"] = riscv.REG_FT3
   593  	register["FT4"] = riscv.REG_FT4
   594  	register["FT5"] = riscv.REG_FT5
   595  	register["FT6"] = riscv.REG_FT6
   596  	register["FT7"] = riscv.REG_FT7
   597  	register["FS0"] = riscv.REG_FS0
   598  	register["FS1"] = riscv.REG_FS1
   599  	register["FA0"] = riscv.REG_FA0
   600  	register["FA1"] = riscv.REG_FA1
   601  	register["FA2"] = riscv.REG_FA2
   602  	register["FA3"] = riscv.REG_FA3
   603  	register["FA4"] = riscv.REG_FA4
   604  	register["FA5"] = riscv.REG_FA5
   605  	register["FA6"] = riscv.REG_FA6
   606  	register["FA7"] = riscv.REG_FA7
   607  	register["FS2"] = riscv.REG_FS2
   608  	register["FS3"] = riscv.REG_FS3
   609  	register["FS4"] = riscv.REG_FS4
   610  	register["FS5"] = riscv.REG_FS5
   611  	register["FS6"] = riscv.REG_FS6
   612  	register["FS7"] = riscv.REG_FS7
   613  	register["FS8"] = riscv.REG_FS8
   614  	register["FS9"] = riscv.REG_FS9
   615  	register["FS10"] = riscv.REG_FS10
   616  	register["FS11"] = riscv.REG_FS11
   617  	register["FT8"] = riscv.REG_FT8
   618  	register["FT9"] = riscv.REG_FT9
   619  	register["FT10"] = riscv.REG_FT10
   620  	register["FT11"] = riscv.REG_FT11
   621  
   622  	// Pseudo-registers.
   623  	register["SB"] = RSB
   624  	register["FP"] = RFP
   625  	register["PC"] = RPC
   626  
   627  	instructions := make(map[string]obj.As)
   628  	for i, s := range obj.Anames {
   629  		instructions[s] = obj.As(i)
   630  	}
   631  	for i, s := range riscv.Anames {
   632  		if obj.As(i) >= obj.A_ARCHSPECIFIC {
   633  			instructions[s] = obj.As(i) + obj.ABaseRISCV
   634  		}
   635  	}
   636  
   637  	return &Arch{
   638  		LinkArch:       &riscv.LinkRISCV64,
   639  		Instructions:   instructions,
   640  		Register:       register,
   641  		RegisterPrefix: nil,
   642  		RegisterNumber: nilRegisterNumber,
   643  		IsJump:         jumpRISCV,
   644  	}
   645  }
   646  
   647  func archS390x() *Arch {
   648  	register := make(map[string]int16)
   649  	// Create maps for easy lookup of instruction names etc.
   650  	// Note that there is no list of names as there is for x86.
   651  	for i := s390x.REG_R0; i <= s390x.REG_R15; i++ {
   652  		register[obj.Rconv(i)] = int16(i)
   653  	}
   654  	for i := s390x.REG_F0; i <= s390x.REG_F15; i++ {
   655  		register[obj.Rconv(i)] = int16(i)
   656  	}
   657  	for i := s390x.REG_V0; i <= s390x.REG_V31; i++ {
   658  		register[obj.Rconv(i)] = int16(i)
   659  	}
   660  	for i := s390x.REG_AR0; i <= s390x.REG_AR15; i++ {
   661  		register[obj.Rconv(i)] = int16(i)
   662  	}
   663  	register["LR"] = s390x.REG_LR
   664  	// Pseudo-registers.
   665  	register["SB"] = RSB
   666  	register["FP"] = RFP
   667  	register["PC"] = RPC
   668  	// Avoid unintentionally clobbering g using R13.
   669  	delete(register, "R13")
   670  	register["g"] = s390x.REG_R13
   671  	registerPrefix := map[string]bool{
   672  		"AR": true,
   673  		"F":  true,
   674  		"R":  true,
   675  	}
   676  
   677  	instructions := make(map[string]obj.As)
   678  	for i, s := range obj.Anames {
   679  		instructions[s] = obj.As(i)
   680  	}
   681  	for i, s := range s390x.Anames {
   682  		if obj.As(i) >= obj.A_ARCHSPECIFIC {
   683  			instructions[s] = obj.As(i) + obj.ABaseS390X
   684  		}
   685  	}
   686  	// Annoying aliases.
   687  	instructions["BR"] = s390x.ABR
   688  	instructions["BL"] = s390x.ABL
   689  
   690  	return &Arch{
   691  		LinkArch:       &s390x.Links390x,
   692  		Instructions:   instructions,
   693  		Register:       register,
   694  		RegisterPrefix: registerPrefix,
   695  		RegisterNumber: s390xRegisterNumber,
   696  		IsJump:         jumpS390x,
   697  	}
   698  }
   699  
   700  func archWasm() *Arch {
   701  	instructions := make(map[string]obj.As)
   702  	for i, s := range obj.Anames {
   703  		instructions[s] = obj.As(i)
   704  	}
   705  	for i, s := range wasm.Anames {
   706  		if obj.As(i) >= obj.A_ARCHSPECIFIC {
   707  			instructions[s] = obj.As(i) + obj.ABaseWasm
   708  		}
   709  	}
   710  
   711  	return &Arch{
   712  		LinkArch:       &wasm.Linkwasm,
   713  		Instructions:   instructions,
   714  		Register:       wasm.Register,
   715  		RegisterPrefix: nil,
   716  		RegisterNumber: nilRegisterNumber,
   717  		IsJump:         jumpWasm,
   718  	}
   719  }
   720  

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