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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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The TLS register is only available on ARM1136 r1p0 and later. Set HWCAP_TLS flags if hardware TLS is available and test for it if CONFIG_CPU_32v6K is not set for V6. Note that we set the TLS instruction in __kuser_get_tls dynamically as suggested by Jamie Lokier <jamie@shareable.org>. Also the __switch_to code is optimized out in most cases as suggested by Nicolas Pitre <nico@fluxnic.net>. Reviewed-by: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
47 lines
1.1 KiB
C
47 lines
1.1 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 __LINUX_ARM_ARCH__ >= 7 || \
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(__LINUX_ARM_ARCH__ == 6 && 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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#elif __LINUX_ARM_ARCH__ == 6
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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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#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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