Initial checkin

BeefySysLib/third_party/libffi/src/powerpc/asm.h

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+/* -----------------------------------------------------------------------
+   asm.h - Copyright (c) 1998 Geoffrey Keating
+
+   PowerPC Assembly glue.
+
+   Permission is hereby granted, free of charge, to any person obtaining
+   a copy of this software and associated documentation files (the
+   ``Software''), to deal in the Software without restriction, including
+   without limitation the rights to use, copy, modify, merge, publish,
+   distribute, sublicense, and/or sell copies of the Software, and to
+   permit persons to whom the Software is furnished to do so, subject to
+   the following conditions:
+
+   The above copyright notice and this permission notice shall be included
+   in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS
+   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+   IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR
+   OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+   ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+   OTHER DEALINGS IN THE SOFTWARE.
+   ----------------------------------------------------------------------- */
+
+#define ASM_GLOBAL_DIRECTIVE .globl
+
+
+#define C_SYMBOL_NAME(name) name
+/* Macro for a label.  */
+#ifdef	__STDC__
+#define C_LABEL(name)		name##:
+#else
+#define C_LABEL(name)		name/**/:
+#endif
+
+/* This seems to always be the case on PPC.  */
+#define ALIGNARG(log2) log2
+/* For ELF we need the `.type' directive to make shared libs work right.  */
+#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg;
+#define ASM_SIZE_DIRECTIVE(name) .size name,.-name
+
+/* If compiled for profiling, call `_mcount' at the start of each function.  */
+#ifdef	PROF
+/* The mcount code relies on the return address being on the stack
+   to locate our caller and so it can restore it; so store one just
+   for its benefit.  */
+#ifdef PIC
+#define CALL_MCOUNT							      \
+  .pushsection;								      \
+  .section ".data";							      \
+  .align ALIGNARG(2);							      \
+0:.long 0;								      \
+  .previous;								      \
+  mflr  %r0;								      \
+  stw   %r0,4(%r1);							      \
+  bl    _GLOBAL_OFFSET_TABLE_@local-4;					      \
+  mflr  %r11;								      \
+  lwz   %r0,0b@got(%r11);						      \
+  bl    JUMPTARGET(_mcount);
+#else  /* PIC */
+#define CALL_MCOUNT							      \
+  .section ".data";							      \
+  .align ALIGNARG(2);							      \
+0:.long 0;								      \
+  .previous;								      \
+  mflr  %r0;								      \
+  lis   %r11,0b@ha;							      \
+  stw   %r0,4(%r1);							      \
+  addi  %r0,%r11,0b@l;							      \
+  bl    JUMPTARGET(_mcount);
+#endif /* PIC */
+#else  /* PROF */
+#define CALL_MCOUNT		/* Do nothing.  */
+#endif /* PROF */
+
+#define	ENTRY(name)							      \
+  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);				      \
+  ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)			      \
+  .align ALIGNARG(2);							      \
+  C_LABEL(name)								      \
+  CALL_MCOUNT
+
+#define EALIGN_W_0  /* No words to insert.  */
+#define EALIGN_W_1  nop
+#define EALIGN_W_2  nop;nop
+#define EALIGN_W_3  nop;nop;nop
+#define EALIGN_W_4  EALIGN_W_3;nop
+#define EALIGN_W_5  EALIGN_W_4;nop
+#define EALIGN_W_6  EALIGN_W_5;nop
+#define EALIGN_W_7  EALIGN_W_6;nop
+
+/* EALIGN is like ENTRY, but does alignment to 'words'*4 bytes
+   past a 2^align boundary.  */
+#ifdef PROF
+#define EALIGN(name, alignt, words)					      \
+  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);				      \
+  ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)			      \
+  .align ALIGNARG(2);							      \
+  C_LABEL(name)								      \
+  CALL_MCOUNT								      \
+  b 0f;									      \
+  .align ALIGNARG(alignt);						      \
+  EALIGN_W_##words;							      \
+  0:
+#else /* PROF */
+#define EALIGN(name, alignt, words)					      \
+  ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name);				      \
+  ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function)			      \
+  .align ALIGNARG(alignt);						      \
+  EALIGN_W_##words;							      \
+  C_LABEL(name)
+#endif
+
+#define END(name)							      \
+  ASM_SIZE_DIRECTIVE(name)
+
+#ifdef PIC
+#define JUMPTARGET(name) name##@plt
+#else
+#define JUMPTARGET(name) name
+#endif
+
+/* Local labels stripped out by the linker.  */
+#define L(x) .L##x