LXR linux/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 defined(CONFIG_CPU_V6)
  32#define tls_emu         0
  33#define has_tls_reg             (elf_hwcap & HWCAP_TLS)
  34#define set_tls         set_tls_v6
  35#elif defined(CONFIG_CPU_32v6K)
  36#define tls_emu         0
  37#define has_tls_reg             1
  38#define set_tls         set_tls_v6k
  39#else
  40#define tls_emu         0
  41#define has_tls_reg             0
  42#define set_tls         set_tls_software
  43#endif
  44
  45#endif  /* __ASMARM_TLS_H */
  46