/Modules/_ctypes/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 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);							      \
 530:.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);							      \
 650:.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