arch/arm/kernel/smccc-call.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (c) 2015, Linaro Limited
   4  */
   5 #include <linux/linkage.h>
   6
   7 #include <asm/opcodes-sec.h>
   8 #include <asm/opcodes-virt.h>
   9 #include <asm/unwind.h>
  10
  11         /*
  12          * Wrap c macros in asm macros to delay expansion until after the
  13          * SMCCC asm macro is expanded.
  14          */
  15         .macro SMCCC_SMC
  16         __SMC(0)
  17         .endm
  18
  19         .macro SMCCC_HVC
  20         __HVC(0)
  21         .endm
  22
  23         .macro SMCCC instr
  24 UNWIND( .fnstart)
  25         mov     r12, sp
  26         push    {r4-r7}
  27 UNWIND( .save   {r4-r7})
  28         ldm     r12, {r4-r7}
  29         \instr
  30         pop     {r4-r7}
  31         ldr     r12, [sp, #(4 * 4)]
  32         stm     r12, {r0-r3}
  33         bx      lr
  34 UNWIND( .fnend)
  35         .endm
  36
  37 /*
  38  * void smccc_smc(unsigned long a0, unsigned long a1, unsigned long a2,
  39  *                unsigned long a3, unsigned long a4, unsigned long a5,
  40  *                unsigned long a6, unsigned long a7, struct arm_smccc_res *res,
  41  *                struct arm_smccc_quirk *quirk)
  42  */
  43 ENTRY(__arm_smccc_smc)
  44         SMCCC SMCCC_SMC
  45 ENDPROC(__arm_smccc_smc)
  46
  47 /*
  48  * void smccc_hvc(unsigned long a0, unsigned long a1, unsigned long a2,
  49  *                unsigned long a3, unsigned long a4, unsigned long a5,
  50  *                unsigned long a6, unsigned long a7, struct arm_smccc_res *res,
  51  *                struct arm_smccc_quirk *quirk)
  52  */
  53 ENTRY(__arm_smccc_hvc)
  54         SMCCC SMCCC_HVC
  55 ENDPROC(__arm_smccc_hvc)