| #ifndef __ASMARM_TLS_H |
| #define __ASMARM_TLS_H |
| |
| #ifdef __ASSEMBLY__ |
| #include <asm/asm-offsets.h> |
| .macro switch_tls_none, base, tp, tpuser, tmp1, tmp2 |
| .endm |
| |
| .macro switch_tls_v6k, base, tp, tpuser, tmp1, tmp2 |
| mrc p15, 0, \tmp2, c13, c0, 2 @ get the user r/w register |
| mcr p15, 0, \tp, c13, c0, 3 @ set TLS register |
| mcr p15, 0, \tpuser, c13, c0, 2 @ and the user r/w register |
| str \tmp2, [\base, #TI_TP_VALUE + 4] @ save it |
| .endm |
| |
| .macro switch_tls_v6, base, tp, tpuser, tmp1, tmp2 |
| ldr \tmp1, =elf_hwcap |
| ldr \tmp1, [\tmp1, #0] |
| mov \tmp2, #0xffff0fff |
| tst \tmp1, #HWCAP_TLS @ hardware TLS available? |
| streq \tp, [\tmp2, #-15] @ set TLS value at 0xffff0ff0 |
| mrcne p15, 0, \tmp2, c13, c0, 2 @ get the user r/w register |
| mcrne p15, 0, \tp, c13, c0, 3 @ yes, set TLS register |
| mcrne p15, 0, \tpuser, c13, c0, 2 @ set user r/w register |
| strne \tmp2, [\base, #TI_TP_VALUE + 4] @ save it |
| .endm |
| |
| .macro switch_tls_software, base, tp, tpuser, tmp1, tmp2 |
| mov \tmp1, #0xffff0fff |
| str \tp, [\tmp1, #-15] @ set TLS value at 0xffff0ff0 |
| .endm |
| #endif |
| |
| #ifdef CONFIG_TLS_REG_EMUL |
| #define tls_emu 1 |
| #define has_tls_reg 1 |
| #define switch_tls switch_tls_none |
| #elif defined(CONFIG_CPU_V6) |
| #define tls_emu 0 |
| #define has_tls_reg (elf_hwcap & HWCAP_TLS) |
| #define switch_tls switch_tls_v6 |
| #elif defined(CONFIG_CPU_32v6K) |
| #define tls_emu 0 |
| #define has_tls_reg 1 |
| #define switch_tls switch_tls_v6k |
| #else |
| #define tls_emu 0 |
| #define has_tls_reg 0 |
| #define switch_tls switch_tls_software |
| #endif |
| |
| #ifndef __ASSEMBLY__ |
| static inline unsigned long get_tpuser(void) |
| { |
| unsigned long reg = 0; |
| |
| if (has_tls_reg && !tls_emu) |
| __asm__("mrc p15, 0, %0, c13, c0, 2" : "=r" (reg)); |
| |
| return reg; |
| } |
| #endif |
| #endif /* __ASMARM_TLS_H */ |