linux/arch/arm/include/asm/vfpmacros.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * arch/arm/include/asm/vfpmacros.h
   4 *
   5 * Assembler-only file containing VFP macros and register definitions.
   6 */
   7#include <asm/hwcap.h>
   8
   9#include <asm/vfp.h>
  10
  11#ifdef CONFIG_AS_VFP_VMRS_FPINST
  12        .macro  VFPFMRX, rd, sysreg, cond
  13        vmrs\cond       \rd, \sysreg
  14        .endm
  15
  16        .macro  VFPFMXR, sysreg, rd, cond
  17        vmsr\cond       \sysreg, \rd
  18        .endm
  19#else
  20        @ Macros to allow building with old toolkits (with no VFP support)
  21        .macro  VFPFMRX, rd, sysreg, cond
  22        MRC\cond        p10, 7, \rd, \sysreg, cr0, 0    @ FMRX  \rd, \sysreg
  23        .endm
  24
  25        .macro  VFPFMXR, sysreg, rd, cond
  26        MCR\cond        p10, 7, \rd, \sysreg, cr0, 0    @ FMXR  \sysreg, \rd
  27        .endm
  28#endif
  29
  30        @ read all the working registers back into the VFP
  31        .macro  VFPFLDMIA, base, tmp
  32        .fpu    vfpv2
  33#if __LINUX_ARM_ARCH__ < 6
  34        fldmiax \base!, {d0-d15}
  35#else
  36        vldmia  \base!, {d0-d15}
  37#endif
  38#ifdef CONFIG_VFPv3
  39        .fpu    vfpv3
  40#if __LINUX_ARM_ARCH__ <= 6
  41        ldr     \tmp, =elf_hwcap                    @ may not have MVFR regs
  42        ldr     \tmp, [\tmp, #0]
  43        tst     \tmp, #HWCAP_VFPD32
  44        vldmiane \base!, {d16-d31}
  45        addeq   \base, \base, #32*4                 @ step over unused register space
  46#else
  47        VFPFMRX \tmp, MVFR0                         @ Media and VFP Feature Register 0
  48        and     \tmp, \tmp, #MVFR0_A_SIMD_MASK      @ A_SIMD field
  49        cmp     \tmp, #2                            @ 32 x 64bit registers?
  50        vldmiaeq \base!, {d16-d31}
  51        addne   \base, \base, #32*4                 @ step over unused register space
  52#endif
  53#endif
  54        .endm
  55
  56        @ write all the working registers out of the VFP
  57        .macro  VFPFSTMIA, base, tmp
  58#if __LINUX_ARM_ARCH__ < 6
  59        fstmiax \base!, {d0-d15}
  60#else
  61        vstmia  \base!, {d0-d15}
  62#endif
  63#ifdef CONFIG_VFPv3
  64        .fpu    vfpv3
  65#if __LINUX_ARM_ARCH__ <= 6
  66        ldr     \tmp, =elf_hwcap                    @ may not have MVFR regs
  67        ldr     \tmp, [\tmp, #0]
  68        tst     \tmp, #HWCAP_VFPD32
  69        vstmiane \base!, {d16-d31}
  70        addeq   \base, \base, #32*4                 @ step over unused register space
  71#else
  72        VFPFMRX \tmp, MVFR0                         @ Media and VFP Feature Register 0
  73        and     \tmp, \tmp, #MVFR0_A_SIMD_MASK      @ A_SIMD field
  74        cmp     \tmp, #2                            @ 32 x 64bit registers?
  75        vstmiaeq \base!, {d16-d31}
  76        addne   \base, \base, #32*4                 @ step over unused register space
  77#endif
  78#endif
  79        .endm
  80
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