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If CONFIG_CPU_V6 is enabled, we may or may not have the TLS register. Use the conditional code which copes with this variability. Otherwise, if CONFIG_CPU_32v6K is set, we know we have the TLS register on all supported CPUs, so use it unconditionally. Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org> Acked-by: Tony Lindgren <tony@atomide.com> Tested-by: Sourav Poddar <sourav.poddar@ti.com> Tested-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
46 lines
1.0 KiB
C
46 lines
1.0 KiB
C
#ifndef __ASMARM_TLS_H
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#define __ASMARM_TLS_H
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#ifdef __ASSEMBLY__
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.macro set_tls_none, tp, tmp1, tmp2
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.endm
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.macro set_tls_v6k, tp, tmp1, tmp2
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mcr p15, 0, \tp, c13, c0, 3 @ set TLS register
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.endm
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.macro set_tls_v6, tp, 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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mcrne p15, 0, \tp, c13, c0, 3 @ yes, set TLS register
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streq \tp, [\tmp2, #-15] @ set TLS value at 0xffff0ff0
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.endm
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.macro set_tls_software, tp, 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 set_tls set_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 set_tls set_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 set_tls set_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 set_tls set_tls_software
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#endif
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#endif /* __ASMARM_TLS_H */
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