arch/arm/include/asm/tls.h

   1 #ifndef __ASMARM_TLS_H
   2 #define __ASMARM_TLS_H
   3
   4 #ifdef __ASSEMBLY__
   5         .macro set_tls_none, tp, tmp1, tmp2
   6         .endm
   7
   8         .macro set_tls_v6k, tp, tmp1, tmp2
   9         mcr     p15, 0, \tp, c13, c0, 3         @ set TLS register
  10         .endm
  11
  12         .macro set_tls_v6, tp, tmp1, tmp2
  13         ldr     \tmp1, =elf_hwcap
  14         ldr     \tmp1, [\tmp1, #0]
  15         mov     \tmp2, #0xffff0fff
  16         tst     \tmp1, #HWCAP_TLS               @ hardware TLS available?
  17         mcrne   p15, 0, \tp, c13, c0, 3         @ yes, set TLS register
  18         streq   \tp, [\tmp2, #-15]              @ set TLS value at 0xffff0ff0
  19         .endm
  20
  21         .macro set_tls_software, tp, tmp1, tmp2
  22         mov     \tmp1, #0xffff0fff
  23         str     \tp, [\tmp1, #-15]              @ set TLS value at 0xffff0ff0
  24         .endm
  25 #endif
  26
  27 #ifdef CONFIG_TLS_REG_EMUL
  28 #define tls_emu         1
  29 #define has_tls_reg             1
  30 #define set_tls         set_tls_none
  31 #elif __LINUX_ARM_ARCH__ >= 7 ||                                        \
  32         (__LINUX_ARM_ARCH__ == 6 && defined(CONFIG_CPU_32v6K))
  33 #define tls_emu         0
  34 #define has_tls_reg             1
  35 #define set_tls         set_tls_v6k
  36 #elif __LINUX_ARM_ARCH__ == 6
  37 #define tls_emu         0
  38 #define has_tls_reg             (elf_hwcap & HWCAP_TLS)
  39 #define set_tls         set_tls_v6
  40 #else
  41 #define tls_emu         0
  42 #define has_tls_reg             0
  43 #define set_tls         set_tls_software
  44 #endif
  45
  46 #endif  /* __ASMARM_TLS_H */