* 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.

diff --git a/ChangeLog b/ChangeLog
index 6c7f83c4c2d7b73daea0a8c959e2fd49818c26c2..7064419db7e0255301a9e63305108516fc8858c9 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2004-10-27  Roland McGrath  <roland@frob.com>
+
+       * 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.
+
 2004-10-26  Roland McGrath  <roland@frob.com>
 
        * sysdeps/mach/hurd/i386/tls.h (_hurd_tls_init): Initialize TCB->tcb.

diff --git a/sysdeps/mach/hurd/fork.c b/sysdeps/mach/hurd/fork.c
index c3f8a1a86b60e348d7e6bb9fae65ddaada9aaada..872859691521b026cff00d07de150f38198014fb 100644 (file)
--- 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 910834687f09a45ee975258e50fa6853eecf47b1..a7c291c53f210634d43aa673a3805a5844e7c5fd 100644 (file)
--- 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 */