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authorRoland McGrath <roland@gnu.org>2004-10-27 07:48:08 +0000
committerRoland McGrath <roland@gnu.org>2004-10-27 07:48:08 +0000
commit3ba7b3831f91dc7a297446458efd811fbe46d3dc (patch)
tree5215b076c6c71dd51c87db860a7c087daee09262 /sysdeps/mach
parent269761cad38c05d687bb4cbb9db963498fa5b3fe (diff)
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* sysdeps/mach/hurd/i386/tls.h (HURD_TLS_DESC_DECL): New macro.
(_hurd_tls_init): Use it. (_hurd_tls_fork): New function. * sysdeps/mach/hurd/fork.c (__fork) [USE_TLS]: Call it.
Diffstat (limited to 'sysdeps/mach')
-rw-r--r--sysdeps/mach/hurd/fork.c10
-rw-r--r--sysdeps/mach/hurd/i386/tls.h50
2 files changed, 47 insertions, 13 deletions
diff --git a/sysdeps/mach/hurd/fork.c b/sysdeps/mach/hurd/fork.c
index c3f8a1a86b..8728596915 100644
--- a/sysdeps/mach/hurd/fork.c
+++ b/sysdeps/mach/hurd/fork.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1994,95,96,97,99,2001,02 Free Software Foundation, Inc.
+/* Copyright (C) 1994,95,96,97,99,2001,02, 04 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -26,6 +26,7 @@
#include "set-hooks.h"
#include <assert.h>
#include "hurdmalloc.h" /* XXX */
+#include <tls.h>
#undef __fork
@@ -529,6 +530,13 @@ __fork (void)
/* Set the child user thread up to return 1 from the setjmp above. */
_hurd_longjmp_thread_state (&state, env, 1);
+
+#if USE_TLS
+ /* Do special thread setup for TLS if needed. */
+ if (err = _hurd_tls_fork (thread, &state))
+ LOSE;
+#endif
+
if (err = __thread_set_state (thread, MACHINE_THREAD_STATE_FLAVOR,
(natural_t *) &state, statecount))
LOSE;
diff --git a/sysdeps/mach/hurd/i386/tls.h b/sysdeps/mach/hurd/i386/tls.h
index 910834687f..a7c291c53f 100644
--- a/sysdeps/mach/hurd/i386/tls.h
+++ b/sysdeps/mach/hurd/i386/tls.h
@@ -45,21 +45,24 @@
# include <errno.h>
# include <assert.h>
+#define HURD_TLS_DESC_DECL(desc, tcb) \
+ struct descriptor desc = \
+ { /* low word: */ \
+ 0xffff /* limit 0..15 */ \
+ | (((unsigned int) (tcb)) << 16) /* base 0..15 */ \
+ , /* high word: */ \
+ ((((unsigned int) (tcb)) >> 16) & 0xff) /* base 16..23 */ \
+ | ((0x12 | 0x60 | 0x80) << 8) /* access = ACC_DATA_W|ACC_PL_U|ACC_P */ \
+ | (0xf << 16) /* limit 16..19 */ \
+ | ((4 | 8) << 20) /* granularity = SZ_32|SZ_G */ \
+ | (((unsigned int) (tcb)) & 0xff000000) /* base 24..31 */ \
+ }
+
+
static inline const char * __attribute__ ((unused))
_hurd_tls_init (tcbhead_t *tcb, int secondcall)
{
- const unsigned int base = (unsigned int) tcb;
- struct descriptor desc =
- { /* low word: */
- 0xffff /* limit 0..15 */
- | (base << 16) /* base 0..15 */
- , /* high word: */
- ((base >> 16) & 0xff) /* base 16..23 */
- | ((0x12 | 0x60 | 0x80) << 8) /* access = ACC_DATA_W|ACC_PL_U|ACC_P */
- | (0xf << 16) /* limit 16..19 */
- | ((4 | 8) << 20) /* granularity = SZ_32|SZ_G */
- | (base & 0xff000000) /* base 24..31 */
- };
+ HURD_TLS_DESC_DECL (desc, tcb);
if (!secondcall)
{
@@ -140,6 +143,29 @@ _hurd_tls_init (tcbhead_t *tcb, int secondcall)
asm ("movl %%gs:%P1,%0" : "=q" (_dtv) : "i" (offsetof (tcbhead_t, dtv)));\
_dtv; })
+/* Set up TLS in the new thread of a fork child, copying from our own. */
+static inline error_t __attribute__ ((unused))
+_hurd_tls_fork (thread_t child, struct machine_thread_state *state)
+{
+ /* Fetch the selector set by _hurd_tls_init. */
+ int sel;
+ asm ("mov %%gs, %w0" : "=q" (sel));
+ if (sel == state->ds) /* _hurd_tls_init was never called. */
+ return 0;
+
+ tcbhead_t *const tcb = THREAD_SELF;
+ HURD_TLS_DESC_DECL (desc, tcb);
+ error_t err;
+
+ if (__builtin_expect (sel, 0x50) & 4) /* LDT selector */
+ err = __i386_set_ldt (child, sel, &desc, 1);
+ else
+ err = __i386_set_gdt (child, &sel, desc);
+
+ state->gs = sel;
+ return err;
+}
+
# endif /* !ASSEMBLER */
#endif /* HAVE_TLS_SUPPORT */