| /* Definitions of target machine for GNU compiler, for MMIX. |
| Copyright (C) 2000-2022 Free Software Foundation, Inc. |
| Contributed by Hans-Peter Nilsson (hp@bitrange.com) |
| |
| This file is part of GCC. |
| |
| GCC is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| GCC is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GCC; see the file COPYING3. If not see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef GCC_MMIX_H |
| #define GCC_MMIX_H |
| |
| /* First, some local helper macros. Note that the "default" value of |
| FIXED_REGISTERS, CALL_USED_REGISTERS, REG_ALLOC_ORDER and |
| REG_CLASS_CONTENTS depend on these values. */ |
| #define MMIX_RESERVED_GNU_ARG_0_REGNUM 231 |
| #define MMIX_FIRST_ARG_REGNUM \ |
| (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 16) |
| #define MMIX_FIRST_INCOMING_ARG_REGNUM \ |
| (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0) |
| #define MMIX_MAX_ARGS_IN_REGS 16 |
| |
| /* FIXME: This one isn't fully implemented yet. Return values larger than |
| one register are passed by reference in MMIX_STRUCT_VALUE_REGNUM by the |
| caller, except for return values of type "complex". */ |
| #define MMIX_MAX_REGS_FOR_VALUE 16 |
| #define MMIX_RETURN_VALUE_REGNUM \ |
| (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 15) |
| #define MMIX_OUTGOING_RETURN_VALUE_REGNUM \ |
| (TARGET_ABI_GNU ? MMIX_RESERVED_GNU_ARG_0_REGNUM : 0) |
| #define MMIX_STRUCT_VALUE_REGNUM 251 |
| #define MMIX_STATIC_CHAIN_REGNUM 252 |
| #define MMIX_FRAME_POINTER_REGNUM 253 |
| #define MMIX_STACK_POINTER_REGNUM 254 |
| #define MMIX_LAST_GENERAL_REGISTER 255 |
| #define MMIX_INCOMING_RETURN_ADDRESS_REGNUM MMIX_rJ_REGNUM |
| #define MMIX_HIMULT_REGNUM 258 |
| #define MMIX_REMAINDER_REGNUM MMIX_rR_REGNUM |
| #define MMIX_ARG_POINTER_REGNUM 261 |
| #define MMIX_rO_REGNUM 262 |
| #define MMIX_LAST_STACK_REGISTER_REGNUM 31 |
| |
| /* Four registers; "ideally, these registers should be call-clobbered", so |
| just grab a bunch of the common clobbered registers. FIXME: Last |
| registers of return-value should be used, with an error if there's a |
| return-value (that collides in size). */ |
| #define MMIX_EH_RETURN_DATA_REGNO_START (MMIX_STRUCT_VALUE_REGNUM - 4) |
| |
| /* Try to keep the definitions from running away on their own. */ |
| #if (MMIX_EH_RETURN_DATA_REGNO_START \ |
| != MMIX_RESERVED_GNU_ARG_0_REGNUM + MMIX_MAX_ARGS_IN_REGS) |
| #error MMIX register definition inconsistency |
| #endif |
| |
| #if (MMIX_MAX_REGS_FOR_VALUE + MMIX_MAX_ARGS_IN_REGS > 32) |
| #error MMIX parameters and return values bad, more than 32 registers |
| #endif |
| |
| /* This chosen as "a call-clobbered hard register that is otherwise |
| untouched by the epilogue". */ |
| #define MMIX_EH_RETURN_STACKADJ_REGNUM MMIX_STATIC_CHAIN_REGNUM |
| |
| #define MMIX_FUNCTION_ARG_SIZE(MODE, TYPE) \ |
| ((MODE) != BLKmode ? GET_MODE_SIZE (MODE) : int_size_in_bytes (TYPE)) |
| |
| /* Per-function machine data. This is normally an opaque type just |
| defined and used in the tm.c file, but we need to see the definition in |
| mmix.md too. */ |
| struct GTY(()) machine_function |
| { |
| int has_landing_pad; |
| int highest_saved_stack_register; |
| int in_prologue; |
| }; |
| |
| /* For these target macros, there is no generic documentation here. You |
| should read `Using and Porting GCC' for that. Only comments specific |
| to the MMIX target are here. |
| |
| There are however references to the specific texinfo node (comments |
| with "Node:"), so there should be little or nothing amiss. Probably |
| the opposite, since we don't have to care about old littering and |
| soon outdated generic comments. */ |
| |
| /* Node: Driver */ |
| |
| /* User symbols are in the same name-space as built-in symbols, but we |
| don't need the built-in symbols, so remove those and instead apply |
| stricter operand checking. Don't warn when expanding insns. */ |
| #define ASM_SPEC "-no-predefined-syms -x" |
| |
| /* Pass on -mset-program-start=N and -mset-data-start=M to the linker. |
| Provide default program start 0x100 unless -mno-set-program-start. |
| Don't do this if linking relocatably, with -r. For a final link, |
| produce mmo, unless ELF is requested or when linking relocatably. */ |
| #define LINK_SPEC \ |
| "%{mset-program-start=*:--defsym __.MMIX.start..text=%*}\ |
| %{mset-data-start=*:--defsym __.MMIX.start..data=%*}\ |
| %{!mset-program-start=*:\ |
| %{!mno-set-program-start:\ |
| %{!r:--defsym __.MMIX.start..text=0x100}}}\ |
| %{!melf:%{!r:-m mmo}}%{melf|r:-m elf64mmix}" |
| |
| /* FIXME: There's no provision for profiling here. */ |
| #define STARTFILE_SPEC \ |
| "crti%O%s crtbegin%O%s" |
| |
| #define ENDFILE_SPEC "crtend%O%s crtn%O%s" |
| |
| /* Node: Run-time Target */ |
| |
| /* Define __LONG_MAX__, since we're advised not to change glimits.h. */ |
| #define TARGET_CPU_CPP_BUILTINS() \ |
| do \ |
| { \ |
| builtin_define ("__mmix__"); \ |
| builtin_define ("__MMIX__"); \ |
| if (TARGET_ABI_GNU) \ |
| builtin_define ("__MMIX_ABI_GNU__"); \ |
| else \ |
| builtin_define ("__MMIX_ABI_MMIXWARE__"); \ |
| } \ |
| while (0) |
| |
| #define TARGET_DEFAULT \ |
| (MASK_BRANCH_PREDICT | MASK_BASE_ADDRESSES | MASK_USE_RETURN_INSN) |
| |
| |
| /* Node: Per-Function Data */ |
| #define INIT_EXPANDERS mmix_init_expanders () |
| |
| |
| /* Node: Storage Layout */ |
| /* I see no bit-field instructions. Anyway, the common order is from low |
| to high, as the power of two, hence little-endian. */ |
| #define BITS_BIG_ENDIAN 0 |
| #define BYTES_BIG_ENDIAN 1 |
| #define WORDS_BIG_ENDIAN 1 |
| #define FLOAT_WORDS_BIG_ENDIAN 1 |
| #define UNITS_PER_WORD 8 |
| |
| /* We need to align everything to 64 bits that can affect the alignment |
| of other types. Since address N is interpreted in MMIX as (N modulo |
| access_size), we must align. */ |
| #define PARM_BOUNDARY 64 |
| #define STACK_BOUNDARY 64 |
| #define FUNCTION_BOUNDARY 32 |
| #define BIGGEST_ALIGNMENT 64 |
| |
| /* This one is only used in the ADA front end. */ |
| #define MINIMUM_ATOMIC_ALIGNMENT 8 |
| |
| /* Copied from elfos.h. */ |
| #define MAX_OFILE_ALIGNMENT (32768 * 8) |
| |
| #define DATA_ABI_ALIGNMENT(TYPE, BASIC_ALIGN) \ |
| mmix_data_alignment (TYPE, BASIC_ALIGN) |
| |
| #define LOCAL_ALIGNMENT(TYPE, BASIC_ALIGN) \ |
| mmix_local_alignment (TYPE, BASIC_ALIGN) |
| |
| /* Following other ports, this seems to most commonly be the word-size, |
| so let's do that here too. */ |
| #define EMPTY_FIELD_BOUNDARY 64 |
| |
| /* We chose to have this low solely for similarity with the alpha. It has |
| nothing to do with passing the tests dg/c99-scope-2 and |
| execute/align-1.c. Nothing. Though the tests seem wrong. Padding of |
| the structure is automatically added to get alignment when needed if we |
| set this to just byte-boundary. */ |
| #define STRUCTURE_SIZE_BOUNDARY 8 |
| |
| /* The lower bits are ignored. */ |
| #define STRICT_ALIGNMENT 1 |
| |
| |
| /* Node: Type Layout */ |
| |
| /* It might seem more natural to have 64-bit ints on a 64-bit machine, |
| but then an occasional MMIX programmer needs to know how to put a lot |
| of __attribute__ stuff to get to the 8, 16 and 32-bit modes rather |
| than the "intuitive" char, short and int types. */ |
| #define INT_TYPE_SIZE 32 |
| #define SHORT_TYPE_SIZE 16 |
| #define LONG_LONG_TYPE_SIZE 64 |
| |
| #define FLOAT_TYPE_SIZE 32 |
| #define DOUBLE_TYPE_SIZE 64 |
| #define LONG_DOUBLE_TYPE_SIZE 64 |
| |
| #define DEFAULT_SIGNED_CHAR 1 |
| |
| |
| /* Node: Register Basics */ |
| /* We tell GCC about all 256 general registers, and we also include |
| rD, rE, rH, rJ, rR and rO (in that order) so we can describe what insns |
| clobber them. We use a faked register for the argument pointer. It is |
| always eliminated towards the frame-pointer or the stack-pointer, never |
| output in assembly. Any fixed register would do for this, like $255, |
| but future debugging is easier when using a separate register. It |
| counts as a global register for pseudorandom reasons. */ |
| #define FIRST_PSEUDO_REGISTER 263 |
| |
| /* We treat general registers with no assigned purpose as fixed. The |
| stack pointer, $254, is also fixed. Register $255 is referred to as a |
| temporary register in the MMIX papers, and used as such in mmixal, so |
| it should not be used as a stack pointer. We set it to fixed, and use |
| it "manually" at times of despair. */ |
| #define FIXED_REGISTERS \ |
| { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ |
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, \ |
| 1, 1, 0, 0, 0, 1, 1 \ |
| } |
| |
| /* General registers are fixed and therefore "historically" marked |
| call-used. (FIXME: This has changed). Registers $15..$31 are |
| call-clobbered; we'll put arguments in $16 and up, and we need $15 for |
| the MMIX register-stack "hole". */ |
| #define CALL_USED_REGISTERS \ |
| { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, \ |
| 1, 1, 1, 1, 1, 1, 1 \ |
| } |
| |
| #define INCOMING_REGNO(OUT) mmix_opposite_regno (OUT, 0) |
| |
| #define OUTGOING_REGNO(IN) mmix_opposite_regno (IN, 1) |
| |
| /* Defining LOCAL_REGNO is necessary in presence of prologue/epilogue, |
| else GCC will be confused that those registers aren't saved and |
| restored. */ |
| #define LOCAL_REGNO(REGNO) mmix_local_regno (REGNO) |
| |
| /* Node: Allocation Order */ |
| |
| /* We should allocate registers from 0 to 31 by increasing number, because |
| I think that's what people expect. Beyond that, just use |
| call-clobbered global registers first, then call-clobbered special |
| registers. Last, the fixed registers. */ |
| #define MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER \ |
| { 0, 1, 2, 3, 4, 5, 6, 7, \ |
| 8, 9, 10, 11, 12, 13, 14, 15, \ |
| 16, 17, 18, 19, 20, 21, 22, 23, \ |
| 24, 25, 26, 27, 28, 29, 30, 31, \ |
| \ |
| 252, 251, 250, 249, 248, 247, \ |
| \ |
| 253, \ |
| \ |
| 258, 260, 259, \ |
| \ |
| 32, 33, 34, 35, 36, 37, 38, 39, \ |
| 40, 41, 42, 43, 44, 45, 46, 47, \ |
| 48, 49, 50, 51, 52, 53, 54, 55, \ |
| 56, 57, 58, 59, 60, 61, 62, 63, \ |
| 64, 65, 66, 67, 68, 69, 70, 71, \ |
| 72, 73, 74, 75, 76, 77, 78, 79, \ |
| 80, 81, 82, 83, 84, 85, 86, 87, \ |
| 88, 89, 90, 91, 92, 93, 94, 95, \ |
| 96, 97, 98, 99, 100, 101, 102, 103, \ |
| 104, 105, 106, 107, 108, 109, 110, 111, \ |
| 112, 113, 114, 115, 116, 117, 118, 119, \ |
| 120, 121, 122, 123, 124, 125, 126, 127, \ |
| 128, 129, 130, 131, 132, 133, 134, 135, \ |
| 136, 137, 138, 139, 140, 141, 142, 143, \ |
| 144, 145, 146, 147, 148, 149, 150, 151, \ |
| 152, 153, 154, 155, 156, 157, 158, 159, \ |
| 160, 161, 162, 163, 164, 165, 166, 167, \ |
| 168, 169, 170, 171, 172, 173, 174, 175, \ |
| 176, 177, 178, 179, 180, 181, 182, 183, \ |
| 184, 185, 186, 187, 188, 189, 190, 191, \ |
| 192, 193, 194, 195, 196, 197, 198, 199, \ |
| 200, 201, 202, 203, 204, 205, 206, 207, \ |
| 208, 209, 210, 211, 212, 213, 214, 215, \ |
| 216, 217, 218, 219, 220, 221, 222, 223, \ |
| 224, 225, 226, 227, 228, 229, 230, 231, \ |
| 232, 233, 234, 235, 236, 237, 238, 239, \ |
| 240, 241, 242, 243, 244, 245, 246, \ |
| \ |
| 254, 255, 256, 257, 261, 262 \ |
| } |
| |
| /* As a convenience, we put this nearby, for ease of comparison. |
| First, call-clobbered registers in reverse order of assignment as |
| parameters (also the top ones; not because they're parameters, but |
| for continuity). |
| |
| Second, saved registers that go on the register-stack. |
| |
| Third, special registers rH, rR and rJ. They should not normally be |
| allocated, but since they're call-clobbered, it is cheaper to use one |
| of them than using a call-saved register for a call-clobbered use, |
| assuming it is referenced a very limited number of times. Other global |
| and fixed registers come next; they are never allocated. */ |
| #define MMIX_GNU_ABI_REG_ALLOC_ORDER \ |
| { 252, 251, 250, 249, 248, 247, 246, \ |
| 245, 244, 243, 242, 241, 240, 239, 238, \ |
| 237, 236, 235, 234, 233, 232, 231, \ |
| \ |
| 0, 1, 2, 3, 4, 5, 6, 7, \ |
| 8, 9, 10, 11, 12, 13, 14, 15, \ |
| 16, 17, 18, 19, 20, 21, 22, 23, \ |
| 24, 25, 26, 27, 28, 29, 30, 31, \ |
| \ |
| 253, \ |
| \ |
| 258, 260, 259, \ |
| \ |
| 32, 33, 34, 35, 36, 37, 38, 39, \ |
| 40, 41, 42, 43, 44, 45, 46, 47, \ |
| 48, 49, 50, 51, 52, 53, 54, 55, \ |
| 56, 57, 58, 59, 60, 61, 62, 63, \ |
| 64, 65, 66, 67, 68, 69, 70, 71, \ |
| 72, 73, 74, 75, 76, 77, 78, 79, \ |
| 80, 81, 82, 83, 84, 85, 86, 87, \ |
| 88, 89, 90, 91, 92, 93, 94, 95, \ |
| 96, 97, 98, 99, 100, 101, 102, 103, \ |
| 104, 105, 106, 107, 108, 109, 110, 111, \ |
| 112, 113, 114, 115, 116, 117, 118, 119, \ |
| 120, 121, 122, 123, 124, 125, 126, 127, \ |
| 128, 129, 130, 131, 132, 133, 134, 135, \ |
| 136, 137, 138, 139, 140, 141, 142, 143, \ |
| 144, 145, 146, 147, 148, 149, 150, 151, \ |
| 152, 153, 154, 155, 156, 157, 158, 159, \ |
| 160, 161, 162, 163, 164, 165, 166, 167, \ |
| 168, 169, 170, 171, 172, 173, 174, 175, \ |
| 176, 177, 178, 179, 180, 181, 182, 183, \ |
| 184, 185, 186, 187, 188, 189, 190, 191, \ |
| 192, 193, 194, 195, 196, 197, 198, 199, \ |
| 200, 201, 202, 203, 204, 205, 206, 207, \ |
| 208, 209, 210, 211, 212, 213, 214, 215, \ |
| 216, 217, 218, 219, 220, 221, 222, 223, \ |
| 224, 225, 226, 227, 228, 229, 230, \ |
| \ |
| 254, 255, 256, 257, 261, 262 \ |
| } |
| |
| /* The default one. */ |
| #define REG_ALLOC_ORDER MMIX_MMIXWARE_ABI_REG_ALLOC_ORDER |
| |
| /* Node: Leaf Functions */ |
| /* (empty) */ |
| |
| |
| /* Node: Register Classes */ |
| |
| enum reg_class |
| { |
| NO_REGS, GENERAL_REGS, REMAINDER_REG, HIMULT_REG, |
| SYSTEM_REGS, ALL_REGS, LIM_REG_CLASSES |
| }; |
| |
| #define N_REG_CLASSES (int) LIM_REG_CLASSES |
| |
| #define REG_CLASS_NAMES \ |
| {"NO_REGS", "GENERAL_REGS", "REMAINDER_REG", "HIMULT_REG", \ |
| "SYSTEM_REGS", "ALL_REGS"} |
| |
| /* Note that the contents of each item is always 32 bits. */ |
| #define REG_CLASS_CONTENTS \ |
| {{0, 0, 0, 0, 0, 0, 0, 0, 0}, \ |
| {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x20}, \ |
| {0, 0, 0, 0, 0, 0, 0, 0, 0x10}, \ |
| {0, 0, 0, 0, 0, 0, 0, 0, 4}, \ |
| {0, 0, 0, 0, 0, 0, 0, 0, 0x7f}, \ |
| {~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, 0x7f}} |
| |
| #define REGNO_REG_CLASS(REGNO) \ |
| ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \ |
| || (REGNO) == MMIX_ARG_POINTER_REGNUM \ |
| ? GENERAL_REGS \ |
| : (REGNO) == MMIX_REMAINDER_REGNUM ? REMAINDER_REG \ |
| : (REGNO) == MMIX_HIMULT_REGNUM ? HIMULT_REG : SYSTEM_REGS) |
| |
| #define BASE_REG_CLASS GENERAL_REGS |
| |
| #define INDEX_REG_CLASS GENERAL_REGS |
| |
| #define REGNO_OK_FOR_BASE_P(REGNO) \ |
| ((REGNO) <= MMIX_LAST_GENERAL_REGISTER \ |
| || (REGNO) == MMIX_ARG_POINTER_REGNUM \ |
| || (reg_renumber[REGNO] > 0 \ |
| && reg_renumber[REGNO] <= MMIX_LAST_GENERAL_REGISTER)) |
| |
| #define REGNO_OK_FOR_INDEX_P(REGNO) REGNO_OK_FOR_BASE_P (REGNO) |
| |
| #define SECONDARY_INPUT_RELOAD_CLASS(CLASS, MODE, X) \ |
| mmix_secondary_reload_class (CLASS, MODE, X, 1) |
| |
| #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS, MODE, X) \ |
| mmix_secondary_reload_class (CLASS, MODE, X, 0) |
| |
| #define CLASS_MAX_NREGS(CLASS, MODE) targetm.hard_regno_nregs (CLASS, MODE) |
| |
| |
| /* Node: Frame Layout */ |
| |
| #define STACK_GROWS_DOWNWARD 1 |
| #define FRAME_GROWS_DOWNWARD 1 |
| |
| #define FIRST_PARM_OFFSET(FUNDECL) 0 |
| |
| #define DYNAMIC_CHAIN_ADDRESS(FRAMEADDR) \ |
| mmix_dynamic_chain_address (FRAMEADDR) |
| |
| /* FIXME: It seems RETURN_ADDR_OFFSET is undocumented. */ |
| |
| #define SETUP_FRAME_ADDRESSES() \ |
| mmix_setup_frame_addresses () |
| |
| #define RETURN_ADDR_RTX(COUNT, FRAME) \ |
| mmix_return_addr_rtx (COUNT, FRAME) |
| |
| /* It's in rJ before we store it somewhere. */ |
| #define INCOMING_RETURN_ADDR_RTX \ |
| gen_rtx_REG (Pmode, MMIX_INCOMING_RETURN_ADDRESS_REGNUM) |
| |
| /* FIXME: This does not seem properly documented or cross-indexed. |
| Nowhere except in the code does it say it *has* to be in the range |
| 0..255, or else it will be truncated. That goes for the default too. */ |
| #define DWARF_FRAME_RETURN_COLUMN \ |
| DWARF_FRAME_REGNUM (MMIX_INCOMING_RETURN_ADDRESS_REGNUM) |
| |
| /* No return address is stored there. */ |
| #define INCOMING_FRAME_SP_OFFSET 0 |
| |
| /* Node: Stack Checking */ |
| /* (empty) */ |
| |
| |
| /* Node: Exception Handling */ |
| |
| #define EH_RETURN_DATA_REGNO(N) \ |
| mmix_eh_return_data_regno (N) |
| |
| #define EH_RETURN_STACKADJ_RTX \ |
| mmix_eh_return_stackadj_rtx () |
| |
| #define EH_RETURN_HANDLER_RTX \ |
| mmix_eh_return_handler_rtx () |
| |
| #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \ |
| mmix_asm_preferred_eh_data_format (CODE, GLOBAL) |
| |
| /* Node: Frame Registers */ |
| #define STACK_POINTER_REGNUM MMIX_STACK_POINTER_REGNUM |
| |
| /* Perhaps we can use HARD_FRAME_POINTER_REGNUM and decide later on |
| what register we want to use. */ |
| #define FRAME_POINTER_REGNUM MMIX_FRAME_POINTER_REGNUM |
| #define ARG_POINTER_REGNUM MMIX_ARG_POINTER_REGNUM |
| |
| #define STATIC_CHAIN_REGNUM MMIX_STATIC_CHAIN_REGNUM |
| |
| |
| /* Node: Elimination */ |
| |
| /* The frame-pointer is stored in a location that either counts to the |
| offset of incoming parameters, or that counts to the offset of the |
| frame, so we can't use a single offset. We therefore eliminate those |
| two separately. */ |
| #define ELIMINABLE_REGS \ |
| {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \ |
| {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \ |
| {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}} |
| |
| #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \ |
| (OFFSET) = mmix_initial_elimination_offset (FROM, TO) |
| |
| |
| /* Node: Stack Arguments */ |
| |
| #define ACCUMULATE_OUTGOING_ARGS 1 |
| |
| |
| /* Node: Register Arguments */ |
| |
| typedef struct { int regs; int lib; } CUMULATIVE_ARGS; |
| |
| #define INIT_CUMULATIVE_ARGS(CUM, FNTYPE, LIBNAME, INDIRECT, N_NAMED_ARGS) \ |
| ((CUM).regs = 0, (CUM).lib = ((LIBNAME) != 0)) |
| |
| #define FUNCTION_ARG_REGNO_P(REGNO) \ |
| mmix_function_arg_regno_p (REGNO, 0) |
| |
| |
| /* Node: Caller Saves */ |
| /* (empty) */ |
| |
| |
| /* Node: Function Entry */ |
| |
| /* See mmix.cc for TARGET_ASM_FUNCTION_PROLOGUE and |
| TARGET_ASM_FUNCTION_EPILOGUE. */ |
| |
| /* We need to say that the epilogue uses the return address, so the |
| initial-value machinery restores it. FIXME: Some targets |
| conditionalize on "reload_completed &&". Investigate difference. |
| FIXME: Not needed if nonlocal_goto_stack_level. */ |
| #define EPILOGUE_USES(REGNO) \ |
| ((REGNO) == MMIX_INCOMING_RETURN_ADDRESS_REGNUM) |
| |
| /* Node: Profiling */ |
| #define FUNCTION_PROFILER(FILE, LABELNO) \ |
| mmix_function_profiler (FILE, LABELNO) |
| |
| /* Node: Trampolines */ |
| |
| #define TRAMPOLINE_SIZE (4*UNITS_PER_WORD) |
| #define TRAMPOLINE_ALIGNMENT BITS_PER_WORD |
| |
| /* Node: Addressing Modes */ |
| |
| #define CONSTANT_ADDRESS_P(X) \ |
| mmix_constant_address_p (X) |
| |
| #define MAX_REGS_PER_ADDRESS 2 |
| |
| |
| /* Node: Condition Code */ |
| |
| #define SELECT_CC_MODE(OP, X, Y) \ |
| mmix_select_cc_mode (OP, X, Y) |
| |
| /* A definition of CANONICALIZE_COMPARISON that changed LE and GT |
| comparisons with -1 to LT and GE respectively, and LT, LTU, GE or GEU |
| comparisons with 256 to 255 and LE, LEU, GT and GTU has been |
| ineffective; the code path for performing the changes did not trig for |
| neither the GCC testsuite nor ghostscript-6.52 nor Knuth's mmix.tar.gz |
| itself (core GCC functionality supposedly handling it) with sources |
| from 2002-06-06. */ |
| |
| #define REVERSIBLE_CC_MODE(MODE) \ |
| mmix_reversible_cc_mode (MODE) |
| |
| |
| /* Node: Costs */ |
| |
| #define SLOW_BYTE_ACCESS 0 |
| |
| /* A PUSHJ doesn't cost more than a PUSHGO, so don't needlessly create |
| the latter. */ |
| #define NO_FUNCTION_CSE 1 |
| |
| /* Node: Sections */ |
| |
| /* This must be a constant string, since it's used in crtstuff.c. */ |
| #define TEXT_SECTION_ASM_OP \ |
| "\t.text ! mmixal:= 9H LOC 8B" |
| |
| /* FIXME: Not documented. */ |
| #define DATA_SECTION_ASM_OP \ |
| mmix_data_section_asm_op () |
| |
| #define READONLY_DATA_SECTION_ASM_OP "\t.section\t.rodata" |
| |
| /* Node: PIC */ |
| /* (empty) */ |
| |
| |
| /* Node: File Framework */ |
| |
| /* While any other punctuation character but ";" would do, we prefer "%" |
| or "!"; "!" is an unary operator and so will not be mistakenly included |
| in correctly formed expressions. The hash character adds mass; catches |
| the eye. We can't have it as a comment char by itself, since it's a |
| hex-number prefix. */ |
| #define ASM_COMMENT_START "!#" |
| |
| /* These aren't currently functional. We just keep them as markers. */ |
| #define ASM_APP_ON "%APP\n" |
| #define ASM_APP_OFF "%NO_APP\n" |
| |
| #define OUTPUT_QUOTED_STRING(STREAM, STRING) \ |
| mmix_output_quoted_string (STREAM, STRING, strlen (STRING)) |
| |
| #define TARGET_ASM_NAMED_SECTION default_elf_asm_named_section |
| |
| /* Node: Data Output */ |
| |
| #define ASM_OUTPUT_ASCII(STREAM, PTR, LEN) \ |
| mmix_asm_output_ascii (STREAM, PTR, LEN) |
| |
| /* Make output more ELF-like, by emitting .hidden for hidden symbols |
| (which don't really matter for mmix-knuth-mmixware). */ |
| #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME) \ |
| default_elf_asm_output_external (FILE, DECL, NAME) |
| |
| /* Node: Uninitialized Data */ |
| |
| #define ASM_OUTPUT_ALIGNED_COMMON(ST, N, S, A) \ |
| mmix_asm_output_aligned_common (ST, N, S, A) |
| |
| #define ASM_OUTPUT_ALIGNED_LOCAL(ST, N, S, A) \ |
| mmix_asm_output_aligned_local (ST, N, S, A) |
| |
| |
| /* Node: Label Output */ |
| |
| #define ASM_OUTPUT_LABEL(STREAM, NAME) \ |
| mmix_asm_output_label (STREAM, NAME) |
| |
| #define ASM_OUTPUT_INTERNAL_LABEL(STREAM, NAME) \ |
| mmix_asm_output_internal_label (STREAM, NAME) |
| |
| #define ASM_DECLARE_REGISTER_GLOBAL(STREAM, DECL, REGNO, NAME) \ |
| mmix_asm_declare_register_global (STREAM, DECL, REGNO, NAME) |
| |
| #define GLOBAL_ASM_OP "\t.global " |
| |
| #define ASM_WEAKEN_LABEL(STREAM, NAME) \ |
| mmix_asm_weaken_label (STREAM, NAME) |
| |
| #define MAKE_DECL_ONE_ONLY(DECL) \ |
| mmix_make_decl_one_only (DECL) |
| |
| #define ASM_OUTPUT_LABELREF(STREAM, NAME) \ |
| mmix_asm_output_labelref (STREAM, NAME) |
| |
| /* We insert a ":" to disambiguate against user symbols like L5. */ |
| #define ASM_GENERATE_INTERNAL_LABEL(LABEL, PREFIX, NUM) \ |
| sprintf (LABEL, "*%s:%ld", PREFIX, (long)(NUM)) |
| |
| /* Insert "::"; these are rarer than internal labels. FIXME: Make sure no |
| ":" is seen in the object file; we don't really want that mmixal |
| feature visible there. We don't want the default, which uses a dot; |
| that'd be incompatible with mmixal. */ |
| #define ASM_PN_FORMAT "%s::%lu" |
| |
| #define ASM_OUTPUT_DEF(STREAM, NAME, VALUE) \ |
| mmix_asm_output_def (STREAM, NAME, VALUE) |
| |
| /* Node: Macros for Initialization */ |
| /* We're compiling to ELF and linking to MMO; fundamental ELF features |
| that GCC depend on are there. */ |
| |
| /* These must be constant strings, since they're used in crtstuff.c. */ |
| #define INIT_SECTION_ASM_OP "\t.section .init,\"ax\" ! mmixal-incompatible" |
| |
| #define FINI_SECTION_ASM_OP "\t.section .fini,\"ax\" ! mmixal-incompatible" |
| |
| #define OBJECT_FORMAT_ELF |
| |
| |
| /* Node: Instruction Output */ |
| |
| /* The non-$ register names must be prefixed with ":", since they're |
| affected by PREFIX. We provide the non-colon names as additional |
| names. */ |
| #define REGISTER_NAMES \ |
| {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", \ |
| "$8", "$9", "$10", "$11", "$12", "$13", "$14", "$15", \ |
| "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23", \ |
| "$24", "$25", "$26", "$27", "$28", "$29", "$30", "$31", \ |
| "$32", "$33", "$34", "$35", "$36", "$37", "$38", "$39", \ |
| "$40", "$41", "$42", "$43", "$44", "$45", "$46", "$47", \ |
| "$48", "$49", "$50", "$51", "$52", "$53", "$54", "$55", \ |
| "$56", "$57", "$58", "$59", "$60", "$61", "$62", "$63", \ |
| "$64", "$65", "$66", "$67", "$68", "$69", "$70", "$71", \ |
| "$72", "$73", "$74", "$75", "$76", "$77", "$78", "$79", \ |
| "$80", "$81", "$82", "$83", "$84", "$85", "$86", "$87", \ |
| "$88", "$89", "$90", "$91", "$92", "$93", "$94", "$95", \ |
| "$96", "$97", "$98", "$99", "$100", "$101", "$102", "$103", \ |
| "$104", "$105", "$106", "$107", "$108", "$109", "$110", "$111", \ |
| "$112", "$113", "$114", "$115", "$116", "$117", "$118", "$119", \ |
| "$120", "$121", "$122", "$123", "$124", "$125", "$126", "$127", \ |
| "$128", "$129", "$130", "$131", "$132", "$133", "$134", "$135", \ |
| "$136", "$137", "$138", "$139", "$140", "$141", "$142", "$143", \ |
| "$144", "$145", "$146", "$147", "$148", "$149", "$150", "$151", \ |
| "$152", "$153", "$154", "$155", "$156", "$157", "$158", "$159", \ |
| "$160", "$161", "$162", "$163", "$164", "$165", "$166", "$167", \ |
| "$168", "$169", "$170", "$171", "$172", "$173", "$174", "$175", \ |
| "$176", "$177", "$178", "$179", "$180", "$181", "$182", "$183", \ |
| "$184", "$185", "$186", "$187", "$188", "$189", "$190", "$191", \ |
| "$192", "$193", "$194", "$195", "$196", "$197", "$198", "$199", \ |
| "$200", "$201", "$202", "$203", "$204", "$205", "$206", "$207", \ |
| "$208", "$209", "$210", "$211", "$212", "$213", "$214", "$215", \ |
| "$216", "$217", "$218", "$219", "$220", "$221", "$222", "$223", \ |
| "$224", "$225", "$226", "$227", "$228", "$229", "$230", "$231", \ |
| "$232", "$233", "$234", "$235", "$236", "$237", "$238", "$239", \ |
| "$240", "$241", "$242", "$243", "$244", "$245", "$246", "$247", \ |
| "$248", "$249", "$250", "$251", "$252", "$253", "$254", "$255", \ |
| ":rD", ":rE", ":rH", ":rJ", ":rR", "ap_!BAD!", ":rO"} |
| |
| #define ADDITIONAL_REGISTER_NAMES \ |
| {{"sp", 254}, {":sp", 254}, {"rD", 256}, {"rE", 257}, \ |
| {"rH", 258}, {"rJ", MMIX_rJ_REGNUM}, {"rO", MMIX_rO_REGNUM}} |
| |
| #define ASM_OUTPUT_REG_PUSH(STREAM, REGNO) \ |
| mmix_asm_output_reg_push (STREAM, REGNO) |
| |
| #define ASM_OUTPUT_REG_POP(STREAM, REGNO) \ |
| mmix_asm_output_reg_pop (STREAM, REGNO) |
| |
| |
| /* Node: Dispatch Tables */ |
| |
| /* We define both types, since SImode is the better, but DImode the only |
| possible for mmixal so that's the one actually used. */ |
| #define ASM_OUTPUT_ADDR_DIFF_ELT(STREAM, BODY, VALUE, REL) \ |
| mmix_asm_output_addr_diff_elt (STREAM, BODY, VALUE, REL) |
| |
| #define ASM_OUTPUT_ADDR_VEC_ELT(STREAM, VALUE) \ |
| mmix_asm_output_addr_vec_elt (STREAM, VALUE) |
| |
| |
| /* Node: Exception Region Output */ |
| /* (empty) */ |
| |
| /* Node: Alignment Output */ |
| |
| #define ASM_OUTPUT_SKIP(STREAM, NBYTES) \ |
| mmix_asm_output_skip (STREAM, NBYTES) |
| |
| #define ASM_OUTPUT_ALIGN(STREAM, POWER) \ |
| mmix_asm_output_align (STREAM, POWER) |
| |
| |
| /* Node: All Debuggers */ |
| |
| #define DBX_REGISTER_NUMBER(REGNO) \ |
| mmix_dbx_register_number (REGNO) |
| |
| |
| /* Node: DBX Options */ |
| /* (empty) */ |
| /* Node: DBX Hooks */ |
| /* (empty) */ |
| /* Node: File Names and DBX */ |
| /* (empty) */ |
| |
| |
| /* Node: DWARF */ |
| #define DWARF2_DEBUGGING_INFO 1 |
| #define DWARF2_ASM_LINE_DEBUG_INFO 1 |
| |
| /* Node: Misc */ |
| |
| /* There's no way to get a PC-relative offset into tables for SImode, so |
| for the moment we have absolute entries in DImode. |
| When we're going ELF, these should be SImode and 1. */ |
| #define CASE_VECTOR_MODE DImode |
| #define CASE_VECTOR_PC_RELATIVE 0 |
| |
| #define WORD_REGISTER_OPERATIONS 1 |
| |
| /* We have a choice, which makes this yet another parameter to tweak. The |
| gut feeling is currently that SIGN_EXTEND wins; "int" is more frequent |
| than "unsigned int", and we have signed characters. FIXME: measure. */ |
| #define LOAD_EXTEND_OP(MODE) (TARGET_ZERO_EXTEND ? ZERO_EXTEND : SIGN_EXTEND) |
| |
| #define MOVE_MAX 8 |
| |
| /* ??? MMIX allows a choice of STORE_FLAG_VALUE. Revisit later, |
| we don't have scc expanders yet. */ |
| |
| #define Pmode DImode |
| |
| #define FUNCTION_MODE QImode |
| |
| /* mmix-knuth-mmixware target has no support of C99 runtime */ |
| #undef TARGET_LIBC_HAS_FUNCTION |
| #define TARGET_LIBC_HAS_FUNCTION no_c99_libc_has_function |
| |
| /* These are checked. */ |
| #define DOLLARS_IN_IDENTIFIERS 0 |
| #define NO_DOLLAR_IN_LABEL |
| #define NO_DOT_IN_LABEL |
| |
| #endif /* GCC_MMIX_H */ |
| /* |
| * Local variables: |
| * eval: (c-set-style "gnu") |
| * indent-tabs-mode: t |
| * End: |
| */ |