| 1 | /* Definitions for TI PRU assembler. |
| 2 | Copyright (C) 2014-2019 Free Software Foundation, Inc. |
| 3 | Contributed by Dimitar Dimitrov <dimitar@dinux.eu> |
| 4 | |
| 5 | This file is part of GAS, the GNU Assembler. |
| 6 | |
| 7 | GAS is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation; either version 3, or (at your option) |
| 10 | any later version. |
| 11 | |
| 12 | GAS is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GAS; see the file COPYING. If not, write to the Free |
| 19 | Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA |
| 20 | 02110-1301, USA. */ |
| 21 | |
| 22 | #ifndef __TC_PRU__ |
| 23 | #define __TC_PRU__ |
| 24 | |
| 25 | #define TARGET_BYTES_BIG_ENDIAN 0 |
| 26 | |
| 27 | /* Words are big enough to hold addresses. */ |
| 28 | #define WORKING_DOT_WORD 1 |
| 29 | |
| 30 | extern const char *pru_target_format (void); |
| 31 | #define TARGET_FORMAT pru_target_format () |
| 32 | #define TARGET_ARCH bfd_arch_pru |
| 33 | |
| 34 | /* A PRU instruction consists of tokens and separator characters |
| 35 | the tokens are things like the instruction name (add, or jmp etc), |
| 36 | the register indices ($5, $7 etc), and constant expressions. The |
| 37 | separator characters are commas, brackets and space. |
| 38 | The instruction name is always separated from other tokens by a space |
| 39 | The maximum number of tokens in an instruction is 6 (the instruction name, |
| 40 | 4 arguments, and a 4th string representing the expected instruction opcode |
| 41 | after assembly. The latter is only used when the assemble is running in |
| 42 | self test mode, otherwise its presence will generate an error. */ |
| 43 | #define PRU_MAX_INSN_TOKENS 7 |
| 44 | |
| 45 | /* There are no machine-specific operands so we #define this to nothing. */ |
| 46 | #define md_operand(x) |
| 47 | |
| 48 | /* Function prototypes exported to rest of GAS. */ |
| 49 | extern void md_assemble (char *op_str); |
| 50 | extern void md_end (void); |
| 51 | extern void md_begin (void); |
| 52 | |
| 53 | #define tc_fix_adjustable(fixp) pru_fix_adjustable (fixp) |
| 54 | extern int pru_fix_adjustable (struct fix *); |
| 55 | |
| 56 | #define tc_frob_label(lab) pru_frob_label (lab) |
| 57 | extern void pru_frob_label (symbolS *); |
| 58 | |
| 59 | extern void md_convert_frag (bfd * headers, segT sec, fragS * fragP); |
| 60 | |
| 61 | #define DIFF_EXPR_OK |
| 62 | |
| 63 | /* FIXME This seems appropriate, given that we intentionally prevent |
| 64 | PRU's .text from being used in a DIFF expression with symbols from |
| 65 | other sections. Revisit once GDB is ported. */ |
| 66 | #define CFI_DIFF_EXPR_OK 0 |
| 67 | |
| 68 | #define TC_PARSE_CONS_RETURN_TYPE int |
| 69 | #define TC_PARSE_CONS_RETURN_NONE 0 |
| 70 | |
| 71 | #define TC_PARSE_CONS_EXPRESSION(EXP, NBYTES) \ |
| 72 | pru_parse_cons_expression (EXP, NBYTES) |
| 73 | extern int pru_parse_cons_expression (expressionS *exp, int size); |
| 74 | |
| 75 | #define TC_CONS_FIX_NEW pru_cons_fix_new |
| 76 | extern void pru_cons_fix_new (struct frag *frag, int where, |
| 77 | unsigned int nbytes, struct expressionS *exp, |
| 78 | const int is_pmem); |
| 79 | |
| 80 | /* If you define this macro, it means that `tc_gen_reloc' may return |
| 81 | multiple relocation entries for a single fixup. In this case, the |
| 82 | return value of `tc_gen_reloc' is a pointer to a null terminated |
| 83 | array. */ |
| 84 | #undef RELOC_EXPANSION_POSSIBLE |
| 85 | |
| 86 | /* No shared lib support, so we don't need to ensure externally |
| 87 | visible symbols can be overridden. */ |
| 88 | #define EXTERN_FORCE_RELOC 0 |
| 89 | |
| 90 | /* If defined, this macro allows control over whether fixups for a |
| 91 | given section will be processed when the linkrelax variable is |
| 92 | set. Define it to zero and handle things in md_apply_fix instead. */ |
| 93 | #define TC_LINKRELAX_FIXUP(SEG) 0 |
| 94 | |
| 95 | /* If this macro returns non-zero, it guarantees that a relocation will be |
| 96 | emitted even when the value can be resolved locally. Do that if |
| 97 | linkrelax is turned on. */ |
| 98 | #define TC_FORCE_RELOCATION(fix) pru_force_relocation (fix) |
| 99 | #define TC_FORCE_RELOCATION_SUB_SAME(fix, seg) \ |
| 100 | (GENERIC_FORCE_RELOCATION_SUB_SAME (fix, seg) || pru_force_relocation (fix)) |
| 101 | extern int pru_force_relocation (struct fix *); |
| 102 | |
| 103 | /* Do not use PC relative fixups and relocations for |
| 104 | anything but real PCREL relocations. */ |
| 105 | #define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \ |
| 106 | (((FIX)->fx_r_type != BFD_RELOC_PRU_S10_PCREL) \ |
| 107 | && ((FIX)->fx_r_type != BFD_RELOC_PRU_U8_PCREL)) |
| 108 | |
| 109 | /* Values passed to md_apply_fix don't include the symbol value. */ |
| 110 | #define MD_APPLY_SYM_VALUE(FIX) 0 |
| 111 | |
| 112 | /* We don't want gas to fixup the following memory related relocations. |
| 113 | We will need them in case that we want to do linker relaxation. |
| 114 | We could in principle keep these fixups in gas when not relaxing. |
| 115 | However, there is no serious performance penalty when making the linker |
| 116 | make the fixup work. Check also that fx_addsy is not NULL, in order to |
| 117 | make sure that the fixup refers to some sort of label. */ |
| 118 | #define TC_VALIDATE_FIX(FIXP,SEG,SKIP) \ |
| 119 | if ((FIXP->fx_r_type == BFD_RELOC_PRU_LDI32 \ |
| 120 | || FIXP->fx_r_type == BFD_RELOC_PRU_U16 \ |
| 121 | || FIXP->fx_r_type == BFD_RELOC_PRU_U16_PMEMIMM \ |
| 122 | || FIXP->fx_r_type == BFD_RELOC_PRU_S10_PCREL \ |
| 123 | || FIXP->fx_r_type == BFD_RELOC_PRU_U8_PCREL \ |
| 124 | || FIXP->fx_r_type == BFD_RELOC_PRU_32_PMEM \ |
| 125 | || FIXP->fx_r_type == BFD_RELOC_PRU_16_PMEM) \ |
| 126 | && FIXP->fx_addsy != NULL \ |
| 127 | && FIXP->fx_subsy == NULL) \ |
| 128 | { \ |
| 129 | symbol_mark_used_in_reloc (FIXP->fx_addsy); \ |
| 130 | goto SKIP; \ |
| 131 | } |
| 132 | |
| 133 | /* This macro is evaluated for any fixup with a fx_subsy that |
| 134 | fixup_segment cannot reduce to a number. If the macro returns |
| 135 | false an error will be reported. */ |
| 136 | #define TC_VALIDATE_FIX_SUB(fix, seg) pru_validate_fix_sub (fix) |
| 137 | extern int pru_validate_fix_sub (struct fix *); |
| 138 | |
| 139 | /* We want .cfi_* pseudo-ops for generating unwind info. */ |
| 140 | #define TARGET_USE_CFIPOP 1 |
| 141 | |
| 142 | /* Program Counter register number is not defined by TI documents. |
| 143 | Pick the virtual number used by GCC. */ |
| 144 | #define DWARF2_DEFAULT_RETURN_COLUMN 132 |
| 145 | |
| 146 | /* The stack grows down, and is only byte aligned. */ |
| 147 | #define DWARF2_CIE_DATA_ALIGNMENT -1 |
| 148 | |
| 149 | #define tc_regname_to_dw2regnum pru_regname_to_dw2regnum |
| 150 | extern int pru_regname_to_dw2regnum (char *regname); |
| 151 | #define tc_cfi_frame_initial_instructions pru_frame_initial_instructions |
| 152 | extern void pru_frame_initial_instructions (void); |
| 153 | |
| 154 | /* The difference between same-section symbols may be affected by linker |
| 155 | relaxation, so do not resolve such expressions in the assembler. */ |
| 156 | #define md_allow_local_subtract(l,r,s) pru_allow_local_subtract (l, r, s) |
| 157 | extern bfd_boolean pru_allow_local_subtract (expressionS *, expressionS *, |
| 158 | segT); |
| 159 | |
| 160 | #endif /* __TC_PRU__ */ |