1 /* 2 * Copyright (c) 2015 Imagination Technologies Ltd 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg 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 GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20 21 /** 22 * @file 23 * MIPS assembly defines from sys/asm.h but rewritten for use with C inline 24 * assembly (rather than from within .s files). 25 */ 26 27 #ifndef AVUTIL_MIPS_ASMDEFS_H 28 #define AVUTIL_MIPS_ASMDEFS_H 29 30 #if defined(_ABI64) && _MIPS_SIM == _ABI64 31 # define mips_reg int64_t 32 # define PTRSIZE " 8 " 33 # define PTRLOG " 3 " 34 # define PTR_ADDU "daddu " 35 # define PTR_ADDIU "daddiu " 36 # define PTR_ADDI "daddi " 37 # define PTR_SUBU "dsubu " 38 # define PTR_L "ld " 39 # define PTR_S "sd " 40 # define PTR_SRA "dsra " 41 # define PTR_SRL "dsrl " 42 # define PTR_SLL "dsll " 43 #else 44 # define mips_reg int32_t 45 # define PTRSIZE " 4 " 46 # define PTRLOG " 2 " 47 # define PTR_ADDU "addu " 48 # define PTR_ADDIU "addiu " 49 # define PTR_ADDI "addi " 50 # define PTR_SUBU "subu " 51 # define PTR_L "lw " 52 # define PTR_S "sw " 53 # define PTR_SRA "sra " 54 # define PTR_SRL "srl " 55 # define PTR_SLL "sll " 56 #endif 57 58 /* 59 * parse_r var, r - Helper assembler macro for parsing register names. 60 * 61 * This converts the register name in $n form provided in \r to the 62 * corresponding register number, which is assigned to the variable \var. It is 63 * needed to allow explicit encoding of instructions in inline assembly where 64 * registers are chosen by the compiler in $n form, allowing us to avoid using 65 * fixed register numbers. 66 * 67 * It also allows newer instructions (not implemented by the assembler) to be 68 * transparently implemented using assembler macros, instead of needing separate 69 * cases depending on toolchain support. 70 * 71 * Simple usage example: 72 * __asm__ __volatile__("parse_r __rt, %0\n\t" 73 * ".insn\n\t" 74 * "# di %0\n\t" 75 * ".word (0x41606000 | (__rt << 16))" 76 * : "=r" (status); 77 */ 78 79 /* Match an individual register number and assign to \var */ 80 #define _IFC_REG(n) \ 81 ".ifc \\r, $" #n "\n\t" \ 82 "\\var = " #n "\n\t" \ 83 ".endif\n\t" 84 85 __asm__(".macro parse_r var r\n\t" 86 "\\var = -1\n\t" 87 _IFC_REG(0) _IFC_REG(1) _IFC_REG(2) _IFC_REG(3) 88 _IFC_REG(4) _IFC_REG(5) _IFC_REG(6) _IFC_REG(7) 89 _IFC_REG(8) _IFC_REG(9) _IFC_REG(10) _IFC_REG(11) 90 _IFC_REG(12) _IFC_REG(13) _IFC_REG(14) _IFC_REG(15) 91 _IFC_REG(16) _IFC_REG(17) _IFC_REG(18) _IFC_REG(19) 92 _IFC_REG(20) _IFC_REG(21) _IFC_REG(22) _IFC_REG(23) 93 _IFC_REG(24) _IFC_REG(25) _IFC_REG(26) _IFC_REG(27) 94 _IFC_REG(28) _IFC_REG(29) _IFC_REG(30) _IFC_REG(31) 95 ".iflt \\var\n\t" 96 ".error \"Unable to parse register name \\r\"\n\t" 97 ".endif\n\t" 98 ".endm"); 99 100 #endif /* AVCODEC_MIPS_ASMDEFS_H */ 101