b428b51ed9
Fix commit 5f4c6bc1f3: it spits out warnings
about missing syscall prototype (it is in <unistd.h>) and it does not
recognize that two uses of _syscallX are to be resolved against kernel
headers in the source tree, not against _syscallX; they in fact do not
compile and would not work anyway.
If _syscallX macros will be removed from the kernel tree altogether, the
only reasonable solution for that piece of code is switching to open-coded
inline assembly (it's remapping the whole executable from memory, except
the page containing this code).
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
37 lines
829 B
C
37 lines
829 B
C
#include <errno.h>
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#include <linux/unistd.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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#include "sysdep/tls.h"
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#include "user_util.h"
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/* Checks whether host supports TLS, and sets *tls_min according to the value
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* valid on the host.
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* i386 host have it == 6; x86_64 host have it == 12, for i386 emulation. */
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void check_host_supports_tls(int *supports_tls, int *tls_min) {
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/* Values for x86 and x86_64.*/
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int val[] = {GDT_ENTRY_TLS_MIN_I386, GDT_ENTRY_TLS_MIN_X86_64};
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int i;
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for (i = 0; i < ARRAY_SIZE(val); i++) {
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user_desc_t info;
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info.entry_number = val[i];
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if (syscall(__NR_get_thread_area, &info) == 0) {
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*tls_min = val[i];
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*supports_tls = 1;
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return;
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} else {
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if (errno == EINVAL)
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continue;
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else if (errno == ENOSYS)
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*supports_tls = 0;
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return;
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}
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}
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*supports_tls = 0;
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}
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