1 /* ----------------------------------------------------------------------- 2 asm.h - Copyright (c) 1998 Geoffrey Keating 3 4 PowerPC Assembly glue. 5 6 Permission is hereby granted, free of charge, to any person obtaining 7 a copy of this software and associated documentation files (the 8 ``Software''), to deal in the Software without restriction, including 9 without limitation the rights to use, copy, modify, merge, publish, 10 distribute, sublicense, and/or sell copies of the Software, and to 11 permit persons to whom the Software is furnished to do so, subject to 12 the following conditions: 13 14 The above copyright notice and this permission notice shall be included 15 in all copies or substantial portions of the Software. 16 17 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS 18 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 20 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR 21 OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 22 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 23 OTHER DEALINGS IN THE SOFTWARE. 24 ----------------------------------------------------------------------- */ 25 26 #define ASM_GLOBAL_DIRECTIVE .globl 27 28 29 #define C_SYMBOL_NAME(name) name 30 /* Macro for a label. */ 31 #ifdef __STDC__ 32 #define C_LABEL(name) name##: 33 #else 34 #define C_LABEL(name) name/**/: 35 #endif 36 37 /* This seems to always be the case on PPC. */ 38 #define ALIGNARG(log2) log2 39 /* For ELF we need the `.type' directive to make shared libs work right. */ 40 #define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg; 41 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name 42 43 /* If compiled for profiling, call `_mcount' at the start of each function. */ 44 #ifdef PROF 45 /* The mcount code relies on a the return address being on the stack 46 to locate our caller and so it can restore it; so store one just 47 for its benefit. */ 48 #ifdef PIC 49 #define CALL_MCOUNT \ 50 .pushsection; \ 51 .section ".data"; \ 52 .align ALIGNARG(2); \ 53 0:.long 0; \ 54 .previous; \ 55 mflr %r0; \ 56 stw %r0,4(%r1); \ 57 bl _GLOBAL_OFFSET_TABLE_@local-4; \ 58 mflr %r11; \ 59 lwz %r0,0b@got(%r11); \ 60 bl JUMPTARGET(_mcount); 61 #else /* PIC */ 62 #define CALL_MCOUNT \ 63 .section ".data"; \ 64 .align ALIGNARG(2); \ 65 0:.long 0; \ 66 .previous; \ 67 mflr %r0; \ 68 lis %r11,0b@ha; \ 69 stw %r0,4(%r1); \ 70 addi %r0,%r11,0b@l; \ 71 bl JUMPTARGET(_mcount); 72 #endif /* PIC */ 73 #else /* PROF */ 74 #define CALL_MCOUNT /* Do nothing. */ 75 #endif /* PROF */ 76 77 #define ENTRY(name) \ 78 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \ 79 ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \ 80 .align ALIGNARG(2); \ 81 C_LABEL(name) \ 82 CALL_MCOUNT 83 84 #define EALIGN_W_0 /* No words to insert. */ 85 #define EALIGN_W_1 nop 86 #define EALIGN_W_2 nop;nop 87 #define EALIGN_W_3 nop;nop;nop 88 #define EALIGN_W_4 EALIGN_W_3;nop 89 #define EALIGN_W_5 EALIGN_W_4;nop 90 #define EALIGN_W_6 EALIGN_W_5;nop 91 #define EALIGN_W_7 EALIGN_W_6;nop 92 93 /* EALIGN is like ENTRY, but does alignment to 'words'*4 bytes 94 past a 2^align boundary. */ 95 #ifdef PROF 96 #define EALIGN(name, alignt, words) \ 97 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \ 98 ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \ 99 .align ALIGNARG(2); \ 100 C_LABEL(name) \ 101 CALL_MCOUNT \ 102 b 0f; \ 103 .align ALIGNARG(alignt); \ 104 EALIGN_W_##words; \ 105 0: 106 #else /* PROF */ 107 #define EALIGN(name, alignt, words) \ 108 ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \ 109 ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \ 110 .align ALIGNARG(alignt); \ 111 EALIGN_W_##words; \ 112 C_LABEL(name) 113 #endif 114 115 #define END(name) \ 116 ASM_SIZE_DIRECTIVE(name) 117 118 #ifdef PIC 119 #define JUMPTARGET(name) name##@plt 120 #else 121 #define JUMPTARGET(name) name 122 #endif 123 124 /* Local labels stripped out by the linker. */ 125 #define L(x) .L##x 126