1; Options for the CRIS port of the compiler. 2 3; Copyright (C) 2005-2020 Free Software Foundation, Inc. 4; 5; This file is part of GCC. 6; 7; GCC is free software; you can redistribute it and/or modify it under 8; the terms of the GNU General Public License as published by the Free 9; Software Foundation; either version 3, or (at your option) any later 10; version. 11; 12; GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13; WARRANTY; without even the implied warranty of MERCHANTABILITY or 14; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15; for more details. 16; 17; You should have received a copy of the GNU General Public License 18; along with GCC; see the file COPYING3. If not see 19; <http://www.gnu.org/licenses/>. 20 21; TARGET_MUL_BUG: Whether or not to work around multiplication 22; instruction hardware bug when generating code for models where 23; it may be present. From the trouble report for Etrax 100 LX: 24; "A multiply operation may cause incorrect cache behavior 25; under some specific circumstances. The problem can occur if 26; the instruction following the multiply instruction causes a 27; cache miss, and multiply operand 1 (source operand) bits 28; [31:27] matches the logical mapping of the mode register 29; address (0xb0....), and bits [9:2] of operand 1 matches the 30; TLB register address (0x258-0x25f). There is such a mapping 31; in kernel mode or when the MMU is off. Normally there is no 32; such mapping in user mode, and the problem will therefore 33; probably not occur in Linux user mode programs." 34; 35; We have no sure-fire way to know from within GCC that we're 36; compiling a user program. For example, -fpic/PIC is used in 37; libgcc which is linked into the kernel. However, the 38; workaround option -mno-mul-bug can be safely used per-package 39; when compiling programs. The same goes for general user-only 40; libraries such as glibc, since there's no user-space 41; driver-like program that gets a mapping of I/O registers (all 42; on the same page, including the TLB registers). 43mmul-bug-workaround 44Target Report Mask(MUL_BUG) 45Work around bug in multiplication instruction. 46 47; TARGET_ETRAX4_ADD: Instruction-set additions from Etrax 4 and up. 48; (Just "lz".) 49metrax4 50Target Report Mask(ETRAX4_ADD) 51Compile for ETRAX 4 (CRIS v3). 52 53; See cris_handle_option. 54metrax100 55Target Report RejectNegative 56Compile for ETRAX 100 (CRIS v8). 57 58; See cris_handle_option. 59mno-etrax100 60Target Report RejectNegative Undocumented 61 62mpdebug 63Target Report Mask(PDEBUG) 64Emit verbose debug information in assembly code. 65 66; TARGET_CCINIT: Whether to use condition-codes generated by 67; insns other than the immediately preceding compare/test insn. 68; Used to check for errors in notice_update_cc. 69mcc-init 70Target Report Mask(CCINIT) 71Do not use condition codes from normal instructions. 72 73; TARGET_SIDE_EFFECT_PREFIXES: Whether to use side-effect 74; patterns. Used to debug the [rx=ry+i] type patterns. 75mside-effects 76Target Report RejectNegative Mask(SIDE_EFFECT_PREFIXES) Undocumented 77 78mno-side-effects 79Target Report RejectNegative InverseMask(SIDE_EFFECT_PREFIXES) 80Do not emit addressing modes with side-effect assignment. 81 82; TARGET_STACK_ALIGN: Whether to *keep* (not force) alignment of 83; stack at 16 (or 32, depending on TARGET_ALIGN_BY_32) bits. 84mstack-align 85Target Report RejectNegative Mask(STACK_ALIGN) Undocumented 86 87mno-stack-align 88Target Report RejectNegative InverseMask(STACK_ALIGN) 89Do not tune stack alignment. 90 91; TARGET_DATA_ALIGN: Whether to do alignment on individual 92; modifiable objects. 93mdata-align 94Target Report RejectNegative Mask(DATA_ALIGN) Undocumented 95 96mno-data-align 97Target Report RejectNegative InverseMask(DATA_ALIGN) 98Do not tune writable data alignment. 99 100; TARGET_CONST_ALIGN: Whether to do alignment on individual 101; non-modifiable objects. 102mconst-align 103Target Report RejectNegative Mask(CONST_ALIGN) Undocumented 104 105mno-const-align 106Target Report RejectNegative InverseMask(CONST_ALIGN) 107Do not tune code and read-only data alignment. 108 109; See cris_handle_option. 110m32-bit 111Target Report RejectNegative Undocumented 112 113; See cris_handle_option. 114m32bit 115Target Report RejectNegative 116Align code and data to 32 bits. 117 118; See cris_handle_option. 119m16-bit 120Target Report RejectNegative Undocumented 121 122; See cris_handle_option. 123m16bit 124Target Report RejectNegative Undocumented 125 126; See cris_handle_option. 127m8-bit 128Target Report RejectNegative Undocumented 129 130; See cris_handle_option. 131m8bit 132Target Report RejectNegative 133Don't align items in code or data. 134 135; TARGET_PROLOGUE_EPILOGUE: Whether or not to omit function 136; prologue and epilogue. 137mprologue-epilogue 138Target Report RejectNegative Mask(PROLOGUE_EPILOGUE) Undocumented 139 140mno-prologue-epilogue 141Target Report RejectNegative InverseMask(PROLOGUE_EPILOGUE) 142Do not emit function prologue or epilogue. 143 144; We have to handle this m-option here since we can't wash it 145; off in both CC1_SPEC and CC1PLUS_SPEC. 146 147mbest-lib-options 148Target Report RejectNegative 149Use the most feature-enabling options allowed by other options. 150 151; FIXME: The following comment relates to gcc before cris.opt. 152; Check if it's still valid: 153; We must call it "override-" since calling it "no-" will cause 154; gcc.c to forget it, if there's a "later" -mbest-lib-options. 155; Kludgy, but needed for some multilibbed files. 156moverride-best-lib-options 157Target Report RejectNegative 158Override -mbest-lib-options. 159 160mcpu= 161Target Report RejectNegative Joined Undocumented Var(cris_cpu_str) 162 163march= 164Target Report RejectNegative Joined Var(cris_cpu_str) 165-march=ARCH Generate code for the specified chip or CPU version. 166 167mtune= 168Target Report RejectNegative Joined Var(cris_tune_str) 169-mtune=ARCH Tune alignment for the specified chip or CPU version. 170 171mmax-stackframe= 172Target Report RejectNegative Joined Var(cris_max_stackframe_str) 173-mmax-stackframe=SIZE Warn when a stackframe is larger than the specified size. 174 175max-stackframe= 176Target Report RejectNegative Joined Undocumented Var(cris_max_stackframe_str) 177 178mtrap-using-break8 179Target Report Var(cris_trap_using_break8) Init(2) 180Emit traps as \"break 8\", default for CRIS v3 and up. If disabled, calls to abort() are used. 181 182mtrap-unaligned-atomic 183Target Report Var(cris_trap_unaligned_atomic) Init(2) 184Emit checks causing \"break 8\" instructions to execute when applying atomic builtins on misaligned memory. 185 186munaligned-atomic-may-use-library 187Target Report Var(cris_atomics_calling_libfunc) Init(2) 188Handle atomic builtins that may be applied to unaligned data by calling library functions. Overrides -mtrap-unaligned-atomic. 189 190; TARGET_SVINTO: Currently this just affects alignment. FIXME: 191; Redundant with TARGET_ALIGN_BY_32, or put machine stuff here? 192; This and the others below could just as well be variables and 193; TARGET_* defines in cris.h. 194Mask(SVINTO) 195 196; TARGET_ALIGN_BY_32: Say that all alignment specifications say 197; to prefer 32 rather than 16 bits. 198Mask(ALIGN_BY_32) 199 200; TARGET_AVOID_GOTPLT is referred to in the .c and the .md so we 201; need to allocate the flag and macros here. 202Mask(AVOID_GOTPLT) 203