ia64.s

   1 // rb_ia64_flushrs and rb_ia64_bsp is written in IA64 assembly language
   2 // because Intel Compiler for IA64 doesn't support inline assembly.
   3 //
   4 // This file is based on following C program compiled by gcc.
   5 //
   6 //   void rb_ia64_flushrs(void) { __builtin_ia64_flushrs(); }
   7 //   void *rb_ia64_bsp(void) { return __builtin_ia64_bsp(); }
   8 //
   9 // Note that rb_ia64_flushrs and rb_ia64_bsp works in its own stack frame.
  10 // It's because BSP is updated by br.call/brl.call (not alloc instruction).
  11 // So rb_ia64_flushrs flushes stack frames including caller's one.
  12 // rb_ia64_bsp returns the address next to caller's register stack frame.
  13 //
  14 // See also
  15 // Intel Itanium Architecture Software Developer's Manual
  16 // Volume 2: System Architecture.
  17 //
  18         .file   "ia64.c"
  19         .text
  20         .align 16
  21         .global rb_ia64_flushrs#
  22         .proc rb_ia64_flushrs#
  23 rb_ia64_flushrs:
  24         .prologue
  25         .body
  26         flushrs
  27         ;;
  28         nop.i 0
  29         br.ret.sptk.many b0
  30         .endp rb_ia64_flushrs#
  31         .align 16
  32         .global rb_ia64_bsp#
  33         .proc rb_ia64_bsp#
  34 rb_ia64_bsp:
  35         .prologue
  36         .body
  37         nop.m 0
  38         ;;
  39         mov r8 = ar.bsp
  40         br.ret.sptk.many b0
  41         .endp rb_ia64_bsp#
  42         .ident  "GCC: (GNU) 3.3.5 (Debian 1:3.3.5-13)"