github.com/prattmic/llgo-embedded@v0.0.0-20150820070356-41cfecea0e1e/third_party/gofrontend/libffi/src/powerpc/asm.h (about)

     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