arch/powerpc/include/asm/static_call.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_POWERPC_STATIC_CALL_H
   3 #define _ASM_POWERPC_STATIC_CALL_H
   4
   5 #define __PPC_SCT(name, inst)                                   \
   6         asm(".pushsection .text, \"ax\"                         \n"     \
   7             ".align 5                                           \n"     \
   8             ".globl " STATIC_CALL_TRAMP_STR(name) "             \n"     \
   9             STATIC_CALL_TRAMP_STR(name) ":                      \n"     \
  10             inst "                                              \n"     \
  11             "   lis     12,2f@ha                                \n"     \
  12             "   lwz     12,2f@l(12)                             \n"     \
  13             "   mtctr   12                                      \n"     \
  14             "   bctr                                            \n"     \
  15             "1: li      3, 0                                    \n"     \
  16             "   blr                                             \n"     \
  17             "2: .long 0                                         \n"     \
  18             ".type " STATIC_CALL_TRAMP_STR(name) ", @function   \n"     \
  19             ".size " STATIC_CALL_TRAMP_STR(name) ", . - " STATIC_CALL_TRAMP_STR(name) " \n" \
  20             ".popsection                                        \n")
  21
  22 #define PPC_SCT_RET0            20              /* Offset of label 1 */
  23 #define PPC_SCT_DATA            28              /* Offset of label 2 */
  24
  25 #define ARCH_DEFINE_STATIC_CALL_TRAMP(name, func)       __PPC_SCT(name, "b " #func)
  26 #define ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name)        __PPC_SCT(name, "blr")
  27 #define ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name)        __PPC_SCT(name, "b .+20")
  28
  29 #endif /* _ASM_POWERPC_STATIC_CALL_H */