3feb88562d
If running on a host not supporting TLS (for instance 2.4) we should report that cleanly to the user, instead of printing not comprehensible "error 5" for that. Additionally, i386 and x86_64 support different ranges for user_desc->entry_number, and we must account for that; we couldn't pass ourselves -1 because we need to override previously existing TLS descriptors which glibc has possibly set, so test at startup the range to use. x86 and x86_64 existing ranges are hardcoded. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Acked-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
76 lines
1.4 KiB
C
76 lines
1.4 KiB
C
#include <errno.h>
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#include <sys/ptrace.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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static _syscall1(int, get_thread_area, user_desc_t *, u_info);
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static _syscall1(int, set_thread_area, user_desc_t *, u_info);
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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 = 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 = 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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