x86.h

   1 /* architecture-dependent header for x86 */
   2 #define LONGSZ          4       /* word size */
   3 #define I_ARCH          "__i386__"
   4
   5 #define N_REGS          8       /* number of registers */
   6 #define N_ARGS          0       /* number of arg registers */
   7 #define N_TMPS          6       /* number of tmp registers */
   8 #define R_TMPS          0x00cf  /* mask of tmp registers */
   9 #define R_ARGS          0x0000  /* mask of arg registers */
  10 #define R_SAVED         0x00c8  /* mask of callee-saved registers */
  11
  12 #define R_CALL          0x0001  /* mask of regs than can hold call dst */
  13 #define R_BYTE          0x0007  /* mask of regs that can perform byte-wide instructions */
  14
  15 /* special registers */
  16 #define REG_FP          5       /* frame pointer register */
  17 #define REG_SP          4       /* stack pointer register */
  18 #define REG_RET         0       /* returned value register */
  19 #define REG_FORK        0       /* result of conditional branches */