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