Quelle  static_call.h   Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_STATIC_CALL_H
#define _ASM_POWERPC_STATIC_CALL_H

#define __PPC_SCT(name, inst)     \
 asm(".pushsection .text, \"ax\" \n" \
     ".align 5 \n" \
     ".globl " STATIC_CALL_TRAMP_STR(name) " \n" \
     STATIC_CALL_TRAMP_STR(name) ": \n" \
     inst " \n" \
     " lis 12,2f@ha \n" \
     " lwz 12,2f@l(12) \n" \
     " mtctr 12 \n" \
     " bctr \n" \
     "1: li 3, 0 \n" \
     " blr \n" \
     "2: .long 0 \n" \
     ".type " STATIC_CALL_TRAMP_STR(name) ", @function \n" \
     ".size " STATIC_CALL_TRAMP_STR(name) ", . - " STATIC_CALL_TRAMP_STR(name) " \n" \
     ".popsection \n")

#define PPC_SCT_RET0  20  /* Offset of label 1 */
#define PPC_SCT_DATA  28  /* Offset of label 2 */

#define ARCH_DEFINE_STATIC_CALL_TRAMP(name, func) __PPC_SCT(name, "b " #func)
#define ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name) __PPC_SCT(name, "blr")
#define ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name) __PPC_SCT(name, "b .+20")

#define CALL_INSN_SIZE  4

#endif /* _ASM_POWERPC_STATIC_CALL_H */