asm.h (6125B)
1 /* 2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> 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 #ifndef AVUTIL_X86_ASM_H 22 #define AVUTIL_X86_ASM_H 23 24 #include <stdint.h> 25 #include "config.h" 26 27 typedef struct xmm_reg { uint64_t a, b; } xmm_reg; 28 typedef struct ymm_reg { uint64_t a, b, c, d; } ymm_reg; 29 30 #if ARCH_X86_64 31 # define FF_OPSIZE "q" 32 # define FF_REG_a "rax" 33 # define FF_REG_b "rbx" 34 # define FF_REG_c "rcx" 35 # define FF_REG_d "rdx" 36 # define FF_REG_D "rdi" 37 # define FF_REG_S "rsi" 38 # define FF_PTR_SIZE "8" 39 typedef int64_t x86_reg; 40 41 /* FF_REG_SP is defined in Solaris sys headers, so use FF_REG_sp */ 42 # define FF_REG_sp "rsp" 43 # define FF_REG_BP "rbp" 44 # define FF_REGBP rbp 45 # define FF_REGa rax 46 # define FF_REGb rbx 47 # define FF_REGc rcx 48 # define FF_REGd rdx 49 # define FF_REGSP rsp 50 51 #elif ARCH_X86_32 52 53 # define FF_OPSIZE "l" 54 # define FF_REG_a "eax" 55 # define FF_REG_b "ebx" 56 # define FF_REG_c "ecx" 57 # define FF_REG_d "edx" 58 # define FF_REG_D "edi" 59 # define FF_REG_S "esi" 60 # define FF_PTR_SIZE "4" 61 typedef int32_t x86_reg; 62 63 # define FF_REG_sp "esp" 64 # define FF_REG_BP "ebp" 65 # define FF_REGBP ebp 66 # define FF_REGa eax 67 # define FF_REGb ebx 68 # define FF_REGc ecx 69 # define FF_REGd edx 70 # define FF_REGSP esp 71 #else 72 typedef int x86_reg; 73 #endif 74 75 #define HAVE_7REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE && HAVE_EBP_AVAILABLE)) 76 #define HAVE_6REGS (ARCH_X86_64 || (HAVE_EBX_AVAILABLE || HAVE_EBP_AVAILABLE)) 77 78 #if ARCH_X86_64 && defined(PIC) 79 # define BROKEN_RELOCATIONS 1 80 #endif 81 82 /* 83 * If gcc is not set to support sse (-msse) it will not accept xmm registers 84 * in the clobber list for inline asm. XMM_CLOBBERS takes a list of xmm 85 * registers to be marked as clobbered and evaluates to nothing if they are 86 * not supported, or to the list itself if they are supported. Since a clobber 87 * list may not be empty, XMM_CLOBBERS_ONLY should be used if the xmm 88 * registers are the only in the clobber list. 89 * For example a list with "eax" and "xmm0" as clobbers should become: 90 * : XMM_CLOBBERS("xmm0",) "eax" 91 * and a list with only "xmm0" should become: 92 * XMM_CLOBBERS_ONLY("xmm0") 93 */ 94 #if HAVE_XMM_CLOBBERS 95 # define XMM_CLOBBERS(...) __VA_ARGS__ 96 # define XMM_CLOBBERS_ONLY(...) : __VA_ARGS__ 97 #else 98 # define XMM_CLOBBERS(...) 99 # define XMM_CLOBBERS_ONLY(...) 100 #endif 101 102 /* Use to export labels from asm. */ 103 #define LABEL_MANGLE(a) EXTERN_PREFIX #a 104 105 // Use rip-relative addressing if compiling PIC code on x86-64. 106 #if ARCH_X86_64 && defined(PIC) 107 # define LOCAL_MANGLE(a) #a "(%%rip)" 108 #else 109 # define LOCAL_MANGLE(a) #a 110 #endif 111 112 #if HAVE_INLINE_ASM_DIRECT_SYMBOL_REFS 113 # define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a) 114 # define NAMED_CONSTRAINTS_ADD(...) 115 # define NAMED_CONSTRAINTS(...) 116 # define NAMED_CONSTRAINTS_ARRAY_ADD(...) 117 # define NAMED_CONSTRAINTS_ARRAY(...) 118 #else 119 /* When direct symbol references are used in code passed to a compiler that does not support them 120 * then these references need to be converted to named asm constraints instead. 121 * Instead of returning a direct symbol MANGLE now returns a named constraint for that specific symbol. 122 * In order for this to work there must also be a corresponding entry in the asm-interface. To add this 123 * entry use the macro NAMED_CONSTRAINTS() and pass in a list of each symbol reference used in the 124 * corresponding block of code. (e.g. NAMED_CONSTRAINTS(var1,var2,var3) where var1 is the first symbol etc. ). 125 * If there are already existing constraints then use NAMED_CONSTRAINTS_ADD to add to the existing constraint list. 126 */ 127 # define MANGLE(a) "%["#a"]" 128 // Intel/MSVC does not correctly expand va-args so we need a rather ugly hack in order to get it to work 129 # define FE_0(P,X) P(X) 130 # define FE_1(P,X,X1) P(X), FE_0(P,X1) 131 # define FE_2(P,X,X1,X2) P(X), FE_1(P,X1,X2) 132 # define FE_3(P,X,X1,X2,X3) P(X), FE_2(P,X1,X2,X3) 133 # define FE_4(P,X,X1,X2,X3,X4) P(X), FE_3(P,X1,X2,X3,X4) 134 # define FE_5(P,X,X1,X2,X3,X4,X5) P(X), FE_4(P,X1,X2,X3,X4,X5) 135 # define FE_6(P,X,X1,X2,X3,X4,X5,X6) P(X), FE_5(P,X1,X2,X3,X4,X5,X6) 136 # define FE_7(P,X,X1,X2,X3,X4,X5,X6,X7) P(X), FE_6(P,X1,X2,X3,X4,X5,X6,X7) 137 # define FE_8(P,X,X1,X2,X3,X4,X5,X6,X7,X8) P(X), FE_7(P,X1,X2,X3,X4,X5,X6,X7,X8) 138 # define FE_9(P,X,X1,X2,X3,X4,X5,X6,X7,X8,X9) P(X), FE_8(P,X1,X2,X3,X4,X5,X6,X7,X8,X9) 139 # define GET_FE_IMPL(_0,_1,_2,_3,_4,_5,_6,_7,_8,_9,NAME,...) NAME 140 # define GET_FE(A) GET_FE_IMPL A 141 # define GET_FE_GLUE(x, y) x y 142 # define FOR_EACH_VA(P,...) GET_FE_GLUE(GET_FE((__VA_ARGS__,FE_9,FE_8,FE_7,FE_6,FE_5,FE_4,FE_3,FE_2,FE_1,FE_0)), (P,__VA_ARGS__)) 143 # define NAME_CONSTRAINT(x) [x] "m"(x) 144 // Parameters are a list of each symbol reference required 145 # define NAMED_CONSTRAINTS_ADD(...) , FOR_EACH_VA(NAME_CONSTRAINT,__VA_ARGS__) 146 // Same but without comma for when there are no previously defined constraints 147 # define NAMED_CONSTRAINTS(...) FOR_EACH_VA(NAME_CONSTRAINT,__VA_ARGS__) 148 // Same as above NAMED_CONSTRAINTS except used for passing arrays/pointers instead of normal variables 149 # define NAME_CONSTRAINT_ARRAY(x) [x] "m"(*x) 150 # define NAMED_CONSTRAINTS_ARRAY_ADD(...) , FOR_EACH_VA(NAME_CONSTRAINT_ARRAY,__VA_ARGS__) 151 # define NAMED_CONSTRAINTS_ARRAY(...) FOR_EACH_VA(NAME_CONSTRAINT_ARRAY,__VA_ARGS__) 152 #endif 153 154 #endif /* AVUTIL_X86_ASM_H */