arch/sparc/include/asm/asmmacro.h

   1 /* asmmacro.h: Assembler macros.
   2  *
   3  * Copyright (C) 1996 David S. Miller (davem@caipfs.rutgers.edu)
   4  */
   5
   6 #ifndef _SPARC_ASMMACRO_H
   7 #define _SPARC_ASMMACRO_H
   8
   9 /* All trap entry points _must_ begin with this macro or else you
  10  * lose.  It makes sure the kernel has a proper window so that
  11  * c-code can be called.
  12  */
  13 #define SAVE_ALL_HEAD \
  14         sethi   %hi(trap_setup), %l4; \
  15         jmpl    %l4 + %lo(trap_setup), %l6;
  16 #define SAVE_ALL \
  17         SAVE_ALL_HEAD \
  18          nop;
  19
  20 /* All traps low-level code here must end with this macro. */
  21 #define RESTORE_ALL b ret_trap_entry; clr %l6;
  22
  23 /* Support for run-time patching of single instructions.
  24  * This is used to handle the differences in the ASI for
  25  * MMUREGS for LEON and SUN.
  26  *
  27  * Sample:
  28  * LEON_PI(lda [%g0] ASI_LEON_MMUREGS, %o0
  29  * SUN_PI_(lda [%g0] ASI_M_MMUREGS, %o0
  30  * PI == Patch Instruction
  31  *
  32  * For LEON we will use the first variant,
  33  * and for all other we will use the SUN variant.
  34  * The order is important.
  35  */
  36 #define LEON_PI(...)                            \
  37 662:    __VA_ARGS__
  38
  39 #define SUN_PI_(...)                            \
  40         .section .leon_1insn_patch, "ax";       \
  41         .word 662b;                             \
  42         __VA_ARGS__;                            \
  43         .previous
  44
  45 #endif /* !(_SPARC_ASMMACRO_H) */