mirror of
https://github.com/torvalds/linux
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5f4c6bc1f3
User mode linux uses _syscallX() to call into the host kernel. The recommended way to do this is to use the syscall() function from libc. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Andi Kleen <ak@muc.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ian Molton <spyro@f2s.com> Cc: Mikael Starvik <starvik@axis.com> Cc: David Howells <dhowells@redhat.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Hirokazu Takata <takata.hirokazu@renesas.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Kyle McMartin <kyle@mcmartin.ca> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Kazumoto Kojima <kkojima@rr.iij4u.or.jp> Cc: Richard Curnow <rc@rc0.org.uk> Cc: William Lee Irwin III <wli@holomorphy.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Cc: Miles Bader <uclinux-v850@lsi.nec.co.jp> Cc: Chris Zankel <chris@zankel.net> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
75 lines
1.3 KiB
C
75 lines
1.3 KiB
C
#include <errno.h>
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#include <sys/ptrace.h>
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#include <sys/syscall.h>
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#include <asm/ldt.h>
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#include "sysdep/tls.h"
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#include "uml-config.h"
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/* TLS support - we basically rely on the host's one.*/
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/* In TT mode, this should be called only by the tracing thread, and makes sense
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* only for PTRACE_SET_THREAD_AREA. In SKAS mode, it's used normally.
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*
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*/
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#ifndef PTRACE_GET_THREAD_AREA
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#define PTRACE_GET_THREAD_AREA 25
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#endif
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#ifndef PTRACE_SET_THREAD_AREA
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#define PTRACE_SET_THREAD_AREA 26
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#endif
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int os_set_thread_area(user_desc_t *info, int pid)
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{
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int ret;
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ret = ptrace(PTRACE_SET_THREAD_AREA, pid, info->entry_number,
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(unsigned long) info);
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if (ret < 0)
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ret = -errno;
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return ret;
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}
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#ifdef UML_CONFIG_MODE_SKAS
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int os_get_thread_area(user_desc_t *info, int pid)
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{
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int ret;
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ret = ptrace(PTRACE_GET_THREAD_AREA, pid, info->entry_number,
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(unsigned long) info);
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if (ret < 0)
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ret = -errno;
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return ret;
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}
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#endif
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#ifdef UML_CONFIG_MODE_TT
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#include "linux/unistd.h"
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int do_set_thread_area_tt(user_desc_t *info)
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{
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int ret;
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ret = syscall(__NR_set_thread_area,info);
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if (ret < 0) {
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ret = -errno;
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}
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return ret;
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}
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int do_get_thread_area_tt(user_desc_t *info)
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{
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int ret;
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ret = syscall(__NR_get_thread_area,info);
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if (ret < 0) {
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ret = -errno;
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}
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return ret;
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}
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#endif /* UML_CONFIG_MODE_TT */
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