| 1 | /*␊ |
| 2 | * Copyright (c) 2004 Apple Computer, Inc. All rights reserved.␊ |
| 3 | *␊ |
| 4 | * @APPLE_LICENSE_HEADER_START@␊ |
| 5 | * ␊ |
| 6 | * This file contains Original Code and/or Modifications of Original Code␊ |
| 7 | * as defined in and that are subject to the Apple Public Source License␊ |
| 8 | * Version 2.0 (the 'License'). You may not use this file except in␊ |
| 9 | * compliance with the License. Please obtain a copy of the License at␊ |
| 10 | * http://www.opensource.apple.com/apsl/ and read it before using this␊ |
| 11 | * file.␊ |
| 12 | * ␊ |
| 13 | * The Original Code and all software distributed under the License are␊ |
| 14 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
| 15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
| 16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
| 17 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.␊ |
| 18 | * Please see the License for the specific language governing rights and␊ |
| 19 | * limitations under the License.␊ |
| 20 | * ␊ |
| 21 | * @APPLE_LICENSE_HEADER_END@␊ |
| 22 | */␊ |
| 23 | ␊ |
| 24 | #ifndef _PPC_MODE_INDEPENDENT_ASM_H_␊ |
| 25 | #define _PPC_MODE_INDEPENDENT_ASM_H_␊ |
| 26 | ␊ |
| 27 | ␊ |
| 28 | /* This file facilitates writing mode-independent PPC assembler source, ie␊ |
| 29 | * source which can be built both for 32-bit mode (__ppc__) and 64-bit ␊ |
| 30 | * mode (__ppc64__.)␊ |
| 31 | *␊ |
| 32 | * It defines constants such as the number of bytes in a GPR (GPR_BYTES),␊ |
| 33 | * macros to address and call externals (MI_GET_ADDRESS), and a set of mode␊ |
| 34 | * independent PPC assembler pseudo-mnemonics.␊ |
| 35 | *␊ |
| 36 | * The assembler mnemonics map to word operations when building for __ppc__,␊ |
| 37 | * and to doubleword operations when building for __ppc64__. They use "g" to␊ |
| 38 | * stand for either word or doubleword, depending on the target mode. ␊ |
| 39 | *␊ |
| 40 | * Although there are certainly other things to be aware of when writing code␊ |
| 41 | * targeted at both 32 and 64-bit mode, using these macros and psuedo-mnemonics␊ |
| 42 | * is surprisingly helpful.␊ |
| 43 | */␊ |
| 44 | ␊ |
| 45 | #if defined(__ppc64__)␊ |
| 46 | #define MODE_CHOICE(x, y) y␊ |
| 47 | #elif defined(__ppc__)␊ |
| 48 | #define MODE_CHOICE(x, y) x␊ |
| 49 | #else␊ |
| 50 | #error undefined architecture␊ |
| 51 | #endif␊ |
| 52 | ␊ |
| 53 | ␊ |
| 54 | /* The mode-independent "g" mnemonics. */␊ |
| 55 | ␊ |
| 56 | #define cmpg MODE_CHOICE(cmpw, cmpd)␊ |
| 57 | #define cmplg MODE_CHOICE(cmplw, cmpld)␊ |
| 58 | #define cmpgi MODE_CHOICE(cmpwi, cmpdi)␊ |
| 59 | #define cmplgi MODE_CHOICE(cmplwi, cmpldi)␊ |
| 60 | #define srgi MODE_CHOICE(srwi, srdi)␊ |
| 61 | #define srg MODE_CHOICE(srw, srd)␊ |
| 62 | #define sragi MODE_CHOICE(srawi, sradi)␊ |
| 63 | #define slgi MODE_CHOICE(slwi, sldi)␊ |
| 64 | #define rotlgi MODE_CHOICE(rotlwi, rotldi)␊ |
| 65 | #define clrrgi MODE_CHOICE(clrrwi, clrrdi)␊ |
| 66 | #define cntlzg MODE_CHOICE(cntlzw, cntlzd)␊ |
| 67 | #define lg MODE_CHOICE(lwz, ld)␊ |
| 68 | #define stg MODE_CHOICE(stw, std)␊ |
| 69 | #define lgx MODE_CHOICE(lwzx, ldx)␊ |
| 70 | #define stgx MODE_CHOICE(stwx, stdx)␊ |
| 71 | #define lgu MODE_CHOICE(lwzu, ldu)␊ |
| 72 | #define stgu MODE_CHOICE(stwu, stdu)␊ |
| 73 | #define lgux MODE_CHOICE(lwzux, ldux)␊ |
| 74 | #define stgux MODE_CHOICE(stwux, stdux)␊ |
| 75 | #define lgwa MODE_CHOICE(lwz, lwa)␊ |
| 76 | ␊ |
| 77 | #define g_long MODE_CHOICE(long, quad) // usage is ".g_long"␊ |
| 78 | ␊ |
| 79 | ␊ |
| 80 | /* Architectural constants. */␊ |
| 81 | ␊ |
| 82 | #define GPR_BYTES MODE_CHOICE(4,8) // size of a GPR in bytes␊ |
| 83 | #define LOG2_GPR_BYTES MODE_CHOICE(2,3) // log2(GPR_BYTES)␊ |
| 84 | ␊ |
| 85 | ␊ |
| 86 | /* Stack frame definitions. To keep things simple, we are limited␊ |
| 87 | * to eight arguments and two locals.␊ |
| 88 | */␊ |
| 89 | #define SF_CRSAVE MODE_CHOICE(4,8)␊ |
| 90 | #define SF_RETURN MODE_CHOICE(8,16)␊ |
| 91 | #define SF_ARG1 MODE_CHOICE(24,48)␊ |
| 92 | #define SF_ARG2 MODE_CHOICE(28,56)␊ |
| 93 | #define SF_ARG3 MODE_CHOICE(32,64)␊ |
| 94 | #define SF_ARG4 MODE_CHOICE(36,72)␊ |
| 95 | #define SF_ARG5 MODE_CHOICE(40,80)␊ |
| 96 | #define SF_ARG6 MODE_CHOICE(44,88)␊ |
| 97 | #define SF_ARG7 MODE_CHOICE(48,96)␊ |
| 98 | #define SF_ARG8 MODE_CHOICE(52,104)␊ |
| 99 | #define SF_LOCAL1 MODE_CHOICE(56,112)␊ |
| 100 | #define SF_LOCAL2 MODE_CHOICE(60,120)␊ |
| 101 | #define SF_SIZE MODE_CHOICE(64,128)␊ |
| 102 | ␊ |
| 103 | #define SF_ALIGNMENT MODE_CHOICE(16,32)␊ |
| 104 | #define SF_REDZONE MODE_CHOICE(224,320)␊ |
| 105 | ␊ |
| 106 | #define SF_ROUND(x) (((x)+SF_ALIGNMENT-1)&(-SF_ALIGNMENT))␊ |
| 107 | ␊ |
| 108 | #define SF_MINSIZE MODE_CHOICE(64,128)␊ |
| 109 | ␊ |
| 110 | ␊ |
| 111 | /* WARNING: some clients fall through this macro, so do not attempt␊ |
| 112 | * to optimize by doing an ".align 5" in the macro. Do the 32-byte␊ |
| 113 | * alignment in the .s file, before invoking the macro.␊ |
| 114 | */␊ |
| 115 | #define MI_ENTRY_POINT(name) \␊ |
| 116 | .globl name @\␊ |
| 117 | .text @\␊ |
| 118 | .align 2 @\␊ |
| 119 | name:␊ |
| 120 | ␊ |
| 121 | #define MI_PUSH_STACK_FRAME \␊ |
| 122 | mflr r0 @\␊ |
| 123 | stg r0,SF_RETURN(r1) @\␊ |
| 124 | stgu r1,-SF_SIZE(r1)␊ |
| 125 | ␊ |
| 126 | #define MI_POP_STACK_FRAME_AND_RETURN \␊ |
| 127 | lg r0,SF_RETURN+SF_SIZE(r1) @\␊ |
| 128 | addi r1,r1,SF_SIZE @\␊ |
| 129 | mtlr r0 @\␊ |
| 130 | blr␊ |
| 131 | ␊ |
| 132 | ␊ |
| 133 | /* MI_GET_ADDRESS(reg,var) is the basic primitive to address data or code.␊ |
| 134 | * It works both in 32 and 64-bit mode, and with static and dynamic␊ |
| 135 | * code generation. Note however that it can be invoked at most once per␊ |
| 136 | * symbol, since it always creates a non_lazy_ptr in dynamic mode.␊ |
| 137 | * Save the address for re-use, rather than invoking the macro again.␊ |
| 138 | */␊ |
| 139 | #if defined(__DYNAMIC__)␊ |
| 140 | #define MI_GET_ADDRESS(reg,var) \␊ |
| 141 | mflr r0 @\␊ |
| 142 | bcl 20,31,1f @\␊ |
| 143 | 1: mflr reg @\␊ |
| 144 | mtlr r0 @\␊ |
| 145 | addis reg,reg,ha16(L ## var ## __non_lazy_ptr - 1b) @\␊ |
| 146 | lg reg,lo16(L ## var ## __non_lazy_ptr - 1b)(reg) @\␊ |
| 147 | .non_lazy_symbol_pointer @\␊ |
| 148 | .align LOG2_GPR_BYTES @\␊ |
| 149 | .indirect_symbol var @\␊ |
| 150 | L ## var ## __non_lazy_ptr: @\␊ |
| 151 | .g_long 0 @\␊ |
| 152 | .text @\␊ |
| 153 | .align 2␊ |
| 154 | #else /* ! __DYNAMIC__ */␊ |
| 155 | #define MI_GET_ADDRESS(reg,var) \␊ |
| 156 | lis reg,hi16(var) @\␊ |
| 157 | ori reg,reg,lo16(var)␊ |
| 158 | #endif␊ |
| 159 | ␊ |
| 160 | ␊ |
| 161 | /* MI_CALL_EXTERNAL(var) */␊ |
| 162 | ␊ |
| 163 | #if defined(__DYNAMIC__)␊ |
| 164 | #define MI_CALL_EXTERNAL(var) \␊ |
| 165 | MI_GET_ADDRESS(r12,var) @\␊ |
| 166 | mtctr r12 @\␊ |
| 167 | bctrl␊ |
| 168 | #else /* ! __DYNAMIC__ */␊ |
| 169 | #define MI_CALL_EXTERNAL(var) \␊ |
| 170 | bl var␊ |
| 171 | #endif␊ |
| 172 | ␊ |
| 173 | ␊ |
| 174 | /* MI_BRANCH_EXTERNAL(var) */␊ |
| 175 | ␊ |
| 176 | #if defined(__DYNAMIC__)␊ |
| 177 | #define MI_BRANCH_EXTERNAL(var) \␊ |
| 178 | MI_GET_ADDRESS(r12,var) @\␊ |
| 179 | mtctr r12 @\␊ |
| 180 | bctr␊ |
| 181 | #else /* ! __DYNAMIC__ */␊ |
| 182 | #define MI_BRANCH_EXTERNAL(var) \␊ |
| 183 | b var␊ |
| 184 | #endif␊ |
| 185 | ␊ |
| 186 | ␊ |
| 187 | #endif /* _PPC_MODE_INDEPENDENT_ASM_H_ */␊ |
| 188 | |
