tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
parisc: Add 64bit get_user() and put_user() for 32bit kernel
Allow accessing 64-bit values in userspace from a 32-bit kernel.
The access is not atomic.
Signed-off-by: Helge Deller <deller@gmx.de>
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arch/parisc/include/asm/uaccess.h
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arch/parisc/include/asm/uaccess.h
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#define get_user __get_user
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#if !defined(CONFIG_64BIT)
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#define LDD_USER(ptr) BUILD_BUG()
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#define LDD_USER(ptr) __get_user_asm64(ptr)
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#define STD_USER(x, ptr) __put_user_asm64(x, ptr)
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#else
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#define LDD_USER(ptr) __get_user_asm("ldd", ptr)
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: "=r"(__gu_val), "=r"(__gu_err) \
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: "r"(ptr), "1"(__gu_err) \
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: "r1");
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#if !defined(CONFIG_64BIT)
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#define __get_user_asm64(ptr) \
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__asm__("\n1:\tldw 0(%%sr2,%2),%0" \
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"\n2:\tldw 4(%%sr2,%2),%R0\n\t" \
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ASM_EXCEPTIONTABLE_ENTRY(1b, fixup_get_user_skip_2)\
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ASM_EXCEPTIONTABLE_ENTRY(2b, fixup_get_user_skip_1)\
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: "=r"(__gu_val), "=r"(__gu_err) \
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: "r"(ptr), "1"(__gu_err) \
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: "r1");
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#endif /* !defined(CONFIG_64BIT) */
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#define __put_user(x, ptr) \
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({ \