1  /* Definitions for option handling for IA-32.
       2     Copyright (C) 1988-2023 Free Software Foundation, Inc.
       3  
       4  This file is part of GCC.
       5  
       6  GCC is free software; you can redistribute it and/or modify
       7  it under the terms of the GNU General Public License as published by
       8  the Free Software Foundation; either version 3, or (at your option)
       9  any later version.
      10  
      11  GCC is distributed in the hope that it will be useful,
      12  but WITHOUT ANY WARRANTY; without even the implied warranty of
      13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14  GNU General Public License for more details.
      15  
      16  Under Section 7 of GPL version 3, you are granted additional
      17  permissions described in the GCC Runtime Library Exception, version
      18  3.1, as published by the Free Software Foundation.
      19  
      20  You should have received a copy of the GNU General Public License and
      21  a copy of the GCC Runtime Library Exception along with this program;
      22  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      23  <http://www.gnu.org/licenses/>.  */
      24  
      25  #ifndef I386_OPTS_H
      26  #define I386_OPTS_H
      27  
      28  /* Algorithm to expand string function with.  */
      29  enum stringop_alg
      30  {
      31  #undef DEF_ALG
      32  #define DEF_ALG(alg, name) alg, 
      33  
      34  #include "stringop.def"
      35  last_alg
      36  
      37  #undef DEF_ALG
      38  };
      39  
      40  /* Available call abi.  */
      41  enum calling_abi
      42  {
      43    SYSV_ABI = 0,
      44    MS_ABI = 1
      45  };
      46  
      47  enum fpmath_unit
      48  {
      49    FPMATH_387 = 1,
      50    FPMATH_SSE = 2
      51  };
      52  
      53  enum tls_dialect
      54  {
      55    TLS_DIALECT_GNU,
      56    TLS_DIALECT_GNU2,
      57    TLS_DIALECT_SUN
      58  };
      59  
      60  enum cmodel {
      61    CM_32,	/* The traditional 32-bit ABI.  */
      62    CM_SMALL,	/* Assumes all code and data fits in the low 31 bits.  */
      63    CM_KERNEL,	/* Assumes all code and data fits in the high 31 bits.  */
      64    CM_MEDIUM,	/* Assumes code fits in the low 31 bits; data unlimited.  */
      65    CM_LARGE,	/* No assumptions.  */
      66    CM_SMALL_PIC,	/* Assumes code+data+got/plt fits in a 31 bit region.  */
      67    CM_MEDIUM_PIC,/* Assumes code+got/plt fits in a 31 bit region.  */
      68    CM_LARGE_PIC	/* No assumptions.  */
      69  };
      70  
      71  enum pmode {
      72    PMODE_SI,	/* Pmode == SImode. */
      73    PMODE_DI 	/* Pmode == DImode. */
      74  };
      75  
      76  enum ix86_align_data {
      77    ix86_align_data_type_compat,
      78    ix86_align_data_type_abi,
      79    ix86_align_data_type_cacheline
      80  };
      81  
      82  enum asm_dialect {
      83    ASM_ATT,
      84    ASM_INTEL
      85  };
      86  
      87  enum ix86_veclibabi {
      88    ix86_veclibabi_type_none,
      89    ix86_veclibabi_type_svml,
      90    ix86_veclibabi_type_acml
      91  };
      92  
      93  enum stack_protector_guard {
      94    SSP_TLS,      /* per-thread canary in TLS block */
      95    SSP_GLOBAL    /* global canary */
      96  };
      97  
      98  enum prefer_vector_width {
      99      PVW_NONE,
     100      PVW_AVX128,
     101      PVW_AVX256,
     102      PVW_AVX512
     103  };
     104  
     105  /* This is used to mitigate variant #2 of the speculative execution
     106     vulnerabilities on x86 processors identified by CVE-2017-5715, aka
     107     Spectre.  They convert indirect branches and function returns to
     108     call and return thunks to avoid speculative execution via indirect
     109     call, jmp and ret.  */
     110  enum indirect_branch {
     111    indirect_branch_unset = 0,
     112    indirect_branch_keep,
     113    indirect_branch_thunk,
     114    indirect_branch_thunk_inline,
     115    indirect_branch_thunk_extern
     116  };
     117  
     118  enum instrument_return {
     119    instrument_return_none = 0,
     120    instrument_return_call,
     121    instrument_return_nop5
     122  };
     123  
     124  enum harden_sls {
     125    harden_sls_none = 0,
     126    harden_sls_return = 1 << 0,
     127    harden_sls_indirect_jmp = 1 << 1,
     128    harden_sls_all = harden_sls_return | harden_sls_indirect_jmp
     129  };
     130  
     131  enum lam_type {
     132    lam_none = 0,
     133    lam_u48 = 1,
     134    lam_u57
     135  };
     136  
     137  #endif