arch/arm/cpu/armv7/smccc-call.S

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