libffi/src/powerpc/asm.h

   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 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