i386/standford/2004/src/lab4/inc/asm.h

   1 /* See COPYRIGHT for copyright information. */
   2
   3 #ifndef _ASM_H_
   4 #define _ASM_H_
   5
   6 /*
   7  * Entry point for a procedure called from C
   8  */
   9 #define ASENTRY(proc) .align 2; .globl proc; .type proc,@function; proc:
  10 #define ENTRY(proc) ASENTRY(## proc)
  11
  12 /*
  13  * Align a branch target and fill the gap with NOP's
  14  */
  15 #define ALIGN_TEXT .align 2,0x90
  16 #define SUPERALIGN_TEXT .p2align 4,0x90 /* 16-byte alignment, nop filled */
  17
  18
  19 /*
  20  * gas won't do logical shifts in computed immediates!
  21  */
  22 #define SRL(val, shamt) (((val) >> (shamt)) & ~(-1 << (32 - (shamt))))
  23
  24 #define DEF_SYM(symbol, addr)              \
  25         asm(".globl _" #symbol "\n"        \
  26             "\t.set _" #symbol ",%P0"      \
  27             :: "i" (addr))
  28
  29 #endif /* _ASM_H_ */