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* [Qemu-devel] [PATCH] arm eabi TLS
@ 2007-12-12  0:44 Thayne Harbaugh
  2007-12-12  1:29 ` Paul Brook
  2007-12-12 23:03 ` Fabrice Bellard
  0 siblings, 2 replies; 11+ messages in thread
From: Thayne Harbaugh @ 2007-12-12  0:44 UTC (permalink / raw)
  To: qemu-devel

[-- Attachment #1: Type: text/plain, Size: 336 bytes --]

I believe Paul Brook did the original patch for arm eabi TLS.  The patch
has bounced around for a bit but hasn't been applied.  We've been using
this patch for a while and have tweaked it to be a bit more correct as
far as code organization.

Please let me know what else should be improved for this so that it can
be applied.

Thanks.

[-- Attachment #2: 09_arm_eabitls.patch --]
[-- Type: text/x-patch, Size: 27912 bytes --]

Index: qemu/configure
===================================================================
--- qemu.orig/configure	2007-12-11 10:16:49.000000000 -0700
+++ qemu/configure	2007-12-11 10:16:50.000000000 -0700
@@ -105,6 +105,7 @@
 darwin_user="no"
 build_docs="no"
 uname_release=""
+nptl="yes"
 
 # OS specific
 targetos=`uname -s`
@@ -318,6 +319,8 @@
   ;;
   *) echo "ERROR: unknown option $opt"; show_help="yes"
   ;;
+  --disable-nptl) nptl="no"
+  ;;
   esac
 done
 
@@ -413,6 +416,7 @@
 echo "  --disable-linux-user     disable all linux usermode emulation targets"
 echo "  --enable-darwin-user     enable all darwin usermode emulation targets"
 echo "  --disable-darwin-user    disable all darwin usermode emulation targets"
+echo "  --disable-nptl           disable usermode NPTL guest support"
 echo "  --fmod-lib               path to FMOD library"
 echo "  --fmod-inc               path to FMOD includes"
 echo "  --enable-uname-release=R Return R for uname -r in usermode emulation"
@@ -579,6 +583,23 @@
 }
 EOF
 
+# check NPTL support
+cat > $TMPC <<EOF
+#include <sched.h>
+void foo()
+{
+#ifndef CLONE_SETTLS
+#error bork
+#endif
+}
+EOF
+
+if $cc -c -o $TMPO $TMPC 2> /dev/null ; then
+  :
+else
+   nptl="no"
+fi
+
 ##########################################
 # SDL probe
 
@@ -743,6 +764,7 @@
 echo "Documentation     $build_docs"
 [ ! -z "$uname_release" ] && \
 echo "uname -r          $uname_release"
+echo "NPTL support      $nptl"
 
 if test $sdl_too_old = "yes"; then
 echo "-> Your SDL version is too old - please upgrade to have SDL support"
@@ -948,6 +970,7 @@
     echo "SDL_CFLAGS=`$sdl_config --cflags`" >> $config_mak
   fi
 fi
+
 if test "$cocoa" = "yes" ; then
     echo "#define CONFIG_COCOA 1" >> $config_h
     echo "CONFIG_COCOA=yes" >> $config_mak
@@ -1183,6 +1206,15 @@
   echo "#define TARGET_HAS_ELFLOAD32 1" >> $config_h
 fi
 
+if test "$nptl" = "yes" ; then
+    case "$target_cpu" in
+      arm | armeb | ppc | ppc64)
+        echo "USE_NPTL=yes" >> $config_mak
+        echo "#define USE_NPTL 1" >> $config_h
+      ;;
+    esac
+fi
+
 test -f ${config_h}~ && cmp -s $config_h ${config_h}~ && mv ${config_h}~ $config_h
 
 done # for target in $targets
Index: qemu/exec-all.h
===================================================================
--- qemu.orig/exec-all.h	2007-12-11 10:16:49.000000000 -0700
+++ qemu/exec-all.h	2007-12-11 10:16:50.000000000 -0700
@@ -340,170 +340,7 @@
 extern CPUReadMemoryFunc *io_mem_read[IO_MEM_NB_ENTRIES][4];
 extern void *io_mem_opaque[IO_MEM_NB_ENTRIES];
 
-#if defined(__powerpc__)
-static inline int testandset (int *p)
-{
-    int ret;
-    __asm__ __volatile__ (
-                          "0:    lwarx %0,0,%1\n"
-                          "      xor. %0,%3,%0\n"
-                          "      bne 1f\n"
-                          "      stwcx. %2,0,%1\n"
-                          "      bne- 0b\n"
-                          "1:    "
-                          : "=&r" (ret)
-                          : "r" (p), "r" (1), "r" (0)
-                          : "cr0", "memory");
-    return ret;
-}
-#elif defined(__i386__)
-static inline int testandset (int *p)
-{
-    long int readval = 0;
-
-    __asm__ __volatile__ ("lock; cmpxchgl %2, %0"
-                          : "+m" (*p), "+a" (readval)
-                          : "r" (1)
-                          : "cc");
-    return readval;
-}
-#elif defined(__x86_64__)
-static inline int testandset (int *p)
-{
-    long int readval = 0;
-
-    __asm__ __volatile__ ("lock; cmpxchgl %2, %0"
-                          : "+m" (*p), "+a" (readval)
-                          : "r" (1)
-                          : "cc");
-    return readval;
-}
-#elif defined(__s390__)
-static inline int testandset (int *p)
-{
-    int ret;
-
-    __asm__ __volatile__ ("0: cs    %0,%1,0(%2)\n"
-			  "   jl    0b"
-			  : "=&d" (ret)
-			  : "r" (1), "a" (p), "0" (*p)
-			  : "cc", "memory" );
-    return ret;
-}
-#elif defined(__alpha__)
-static inline int testandset (int *p)
-{
-    int ret;
-    unsigned long one;
-
-    __asm__ __volatile__ ("0:	mov 1,%2\n"
-			  "	ldl_l %0,%1\n"
-			  "	stl_c %2,%1\n"
-			  "	beq %2,1f\n"
-			  ".subsection 2\n"
-			  "1:	br 0b\n"
-			  ".previous"
-			  : "=r" (ret), "=m" (*p), "=r" (one)
-			  : "m" (*p));
-    return ret;
-}
-#elif defined(__sparc__)
-static inline int testandset (int *p)
-{
-	int ret;
-
-	__asm__ __volatile__("ldstub	[%1], %0"
-			     : "=r" (ret)
-			     : "r" (p)
-			     : "memory");
-
-	return (ret ? 1 : 0);
-}
-#elif defined(__arm__)
-static inline int testandset (int *spinlock)
-{
-    register unsigned int ret;
-    __asm__ __volatile__("swp %0, %1, [%2]"
-                         : "=r"(ret)
-                         : "0"(1), "r"(spinlock));
-
-    return ret;
-}
-#elif defined(__mc68000)
-static inline int testandset (int *p)
-{
-    char ret;
-    __asm__ __volatile__("tas %1; sne %0"
-                         : "=r" (ret)
-                         : "m" (p)
-                         : "cc","memory");
-    return ret;
-}
-#elif defined(__ia64)
-
-#include <ia64intrin.h>
-
-static inline int testandset (int *p)
-{
-    return __sync_lock_test_and_set (p, 1);
-}
-#elif defined(__mips__)
-static inline int testandset (int *p)
-{
-    int ret;
-
-    __asm__ __volatile__ (
-	"	.set push		\n"
-	"	.set noat		\n"
-	"	.set mips2		\n"
-	"1:	li	$1, 1		\n"
-	"	ll	%0, %1		\n"
-	"	sc	$1, %1		\n"
-	"	beqz	$1, 1b		\n"
-	"	.set pop		"
-	: "=r" (ret), "+R" (*p)
-	:
-	: "memory");
-
-    return ret;
-}
-#else
-#error unimplemented CPU support
-#endif
-
-typedef int spinlock_t;
-
-#define SPIN_LOCK_UNLOCKED 0
-
-#if defined(CONFIG_USER_ONLY)
-static inline void spin_lock(spinlock_t *lock)
-{
-    while (testandset(lock));
-}
-
-static inline void spin_unlock(spinlock_t *lock)
-{
-    *lock = 0;
-}
-
-static inline int spin_trylock(spinlock_t *lock)
-{
-    return !testandset(lock);
-}
-#else
-static inline void spin_lock(spinlock_t *lock)
-{
-}
-
-static inline void spin_unlock(spinlock_t *lock)
-{
-}
-
-static inline int spin_trylock(spinlock_t *lock)
-{
-    return 1;
-}
-#endif
+#include "qspinlock.h"
 
 extern spinlock_t tb_lock;
 
Index: qemu/linux-user/arm/syscall.h
===================================================================
--- qemu.orig/linux-user/arm/syscall.h	2007-12-11 10:16:49.000000000 -0700
+++ qemu/linux-user/arm/syscall.h	2007-12-11 10:16:50.000000000 -0700
@@ -28,7 +28,9 @@
 #define ARM_SYSCALL_BASE	0x900000
 #define ARM_THUMB_SYSCALL	0
 
-#define ARM_NR_cacheflush (ARM_SYSCALL_BASE + 0xf0000 + 2)
+#define ARM_NR_BASE       0xf0000
+#define ARM_NR_cacheflush (ARM_NR_BASE + 2)
+#define ARM_NR_set_tls    (ARM_NR_BASE + 5)
 
 #define ARM_NR_semihosting	  0x123456
 #define ARM_NR_thumb_semihosting  0xAB
Index: qemu/linux-user/main.c
===================================================================
--- qemu.orig/linux-user/main.c	2007-12-11 10:16:49.000000000 -0700
+++ qemu/linux-user/main.c	2007-12-11 10:16:50.000000000 -0700
@@ -363,6 +363,50 @@
     }
 }
 
+/* Handle a jump to the kernel code page.  */
+static int
+do_kernel_trap(CPUARMState *env)
+{
+    uint32_t addr;
+    uint32_t *ptr;
+    uint32_t cpsr;
+
+    switch (env->regs[15]) {
+    case 0xffff0fc0: /* __kernel_cmpxchg */
+        /* XXX: This only works between threads, not between processes.
+           Use native atomic operations.  */
+        /* ??? This probably breaks horribly if the access segfaults.  */
+        cpu_lock();
+        ptr = (uint32_t *)env->regs[2];
+        cpsr = cpsr_read(env);
+        if (*ptr == env->regs[0]) {
+            *ptr = env->regs[1];
+            env->regs[0] = 0;
+            cpsr |= CPSR_C;
+        } else {
+            env->regs[0] = -1;
+            cpsr &= ~CPSR_C;
+        }
+        cpsr_write(env, cpsr, CPSR_C);
+        cpu_unlock();
+        break;
+    case 0xffff0fe0: /* __kernel_get_tls */
+        env->regs[0] = env->cp15.c13_tls3;
+        break;
+    default:
+        return 1;
+    }
+    /* Jump back to the caller.  */
+    addr = env->regs[14];
+    if (addr & 1) {
+        env->thumb = 1;
+        addr &= ~1;
+    }
+    env->regs[15] = addr;
+
+    return 0;
+}
+
 void cpu_loop(CPUARMState *env)
 {
     int trapnr;
@@ -424,10 +468,8 @@
                     }
                 }
 
-                if (n == ARM_NR_cacheflush) {
-                    arm_cache_flush(env->regs[0], env->regs[1]);
-                } else if (n == ARM_NR_semihosting
-                           || n == ARM_NR_thumb_semihosting) {
+                if (n == ARM_NR_semihosting
+                    || n == ARM_NR_thumb_semihosting) {
                     env->regs[0] = do_arm_semihosting (env);
                 } else if (n == 0 || n >= ARM_SYSCALL_BASE
                            || (env->thumb && n == ARM_THUMB_SYSCALL)) {
@@ -438,6 +480,26 @@
                         n -= ARM_SYSCALL_BASE;
                         env->eabi = 0;
                     }
+                    if (n > ARM_NR_BASE) {
+                        switch (n)
+                          {
+                          case ARM_NR_cacheflush:
+                              arm_cache_flush(env->regs[0], env->regs[1]);
+                              break;
+#ifdef USE_NPTL
+                          case ARM_NR_set_tls:
+                              cpu_set_tls(env, env->regs[0]);
+                              env->regs[0] = 0;
+                              break;
+#endif
+                          default:
+                              printf ("Error: Bad syscall: %x\n", n);
+                              env->regs[0] = -TARGET_ENOSYS;
+                              goto error;
+                          }
+                      }
+                    else
+                      {
                     env->regs[0] = do_syscall(env,
                                               n,
                                               env->regs[0],
@@ -446,7 +508,9 @@
                                               env->regs[3],
                                               env->regs[4],
                                               env->regs[5]);
+                      }
                 } else {
+                    printf ("Error: Bad syscall: %x\n", n);
                     goto error;
                 }
             }
@@ -484,6 +548,10 @@
                   }
             }
             break;
+        case EXCP_KERNEL_TRAP:
+            if (do_kernel_trap(env))
+              goto error;
+            break;
         default:
         error:
             fprintf(stderr, "qemu: unhandled CPU exception 0x%x - aborting\n",
@@ -2348,6 +2416,10 @@
     ts->heap_base = info->brk;
     /* This will be filled in on the first SYS_HEAPINFO call.  */
     ts->heap_limit = 0;
+    /* Register the magic kernel code page.  The cpu will generate a
+       special exception when it tries to execute code here.  We can't
+       put real code here because it may be in use by the host kernel.  */
+    page_set_flags(0xffff0000, 0xffff0fff, 0);
 #endif
 
     if (gdbstub_port) {
Index: qemu/linux-user/qemu.h
===================================================================
--- qemu.orig/linux-user/qemu.h	2007-12-11 10:16:49.000000000 -0700
+++ qemu/linux-user/qemu.h	2007-12-11 10:16:50.000000000 -0700
@@ -104,6 +104,9 @@
 #endif
     int used; /* non zero if used */
     struct image_info *info;
+#ifdef USE_NPTL
+    abi_ulong child_tid_addr;
+#endif
     uint8_t stack[0];
 } __attribute__((aligned(16))) TaskState;
 
Index: qemu/linux-user/syscall.c
===================================================================
--- qemu.orig/linux-user/syscall.c	2007-12-11 10:16:49.000000000 -0700
+++ qemu/linux-user/syscall.c	2007-12-11 10:16:50.000000000 -0700
@@ -71,9 +71,18 @@
 #include <linux/kd.h>
 
 #include "qemu.h"
+#include "qspinlock.h"
 
 //#define DEBUG
 
+#ifdef USE_NPTL
+#define CLONE_NPTL_FLAGS2 (CLONE_SETTLS | \
+    CLONE_PARENT_SETTID | CLONE_CHILD_SETTID | CLONE_CHILD_CLEARTID)
+#else
+/* XXX: Hardcode the above values.  */
+#define CLONE_NPTL_FLAGS2 0
+#endif
+
 #if defined(TARGET_I386) || defined(TARGET_ARM) || defined(TARGET_SPARC) \
     || defined(TARGET_M68K) || defined(TARGET_SH4) || defined(TARGET_CRIS)
 /* 16 bit uid wrappers emulation */
@@ -2797,9 +2806,19 @@
    thread/process */
 #define NEW_STACK_SIZE 8192
 
+#ifdef USE_NPTL
+static spinlock_t nptl_lock = SPIN_LOCK_UNLOCKED;
+#endif
+
 static int clone_func(void *arg)
 {
     CPUState *env = arg;
+#ifdef USE_NPTL
+    /* Wait until the parent has finshed initializing the tls state.  */
+    while (!spin_trylock(&nptl_lock))
+        usleep(1);
+    spin_unlock(&nptl_lock);
+#endif
     cpu_loop(env);
     /* never exits */
     return 0;
@@ -2807,12 +2826,24 @@
 
 /* do_fork() Must return host values and target errnos (unlike most
    do_*() functions). */
-int do_fork(CPUState *env, unsigned int flags, abi_ulong newsp)
+int do_fork(CPUState *env,
+            unsigned int flags,
+            abi_ulong new_stk_addr,
+            abi_ulong parent_tid_addr,
+            abi_ulong newtls_addr,
+            abi_ulong child_tid_addr)
 {
     int ret;
     TaskState *ts;
     uint8_t *new_stack;
     CPUState *new_env;
+#ifdef USE_NPTL
+    unsigned int nptl_flags;
+
+    if (flags & CLONE_PARENT_SETTID)
+        if (put_user_s32(gettid(), parent_tid_addr))
+            return -TARGET_EFAULT;
+#endif
 
     if (flags & CLONE_VM) {
         ts = malloc(sizeof(TaskState) + NEW_STACK_SIZE);
@@ -2824,51 +2855,37 @@
         first_task_state = ts;
         /* we create a new CPU instance. */
         new_env = cpu_copy(env);
+        if (!new_stk_addr)
+            new_stk_addr = get_sp_from_cpustate(env);
 #if defined(TARGET_I386)
-        if (!newsp)
-            newsp = env->regs[R_ESP];
-        new_env->regs[R_ESP] = newsp;
+        new_env->regs[R_ESP] = new_stk_addr;
         new_env->regs[R_EAX] = 0;
 #elif defined(TARGET_ARM)
-        if (!newsp)
-            newsp = env->regs[13];
-        new_env->regs[13] = newsp;
+        new_env->regs[13] = new_stk_addr;
         new_env->regs[0] = 0;
 #elif defined(TARGET_SPARC)
-        if (!newsp)
-            newsp = env->regwptr[22];
-        new_env->regwptr[22] = newsp;
+        new_env->regwptr[22] = new_stk_addr;
         new_env->regwptr[0] = 0;
 	/* XXXXX */
         printf ("HELPME: %s:%d\n", __FILE__, __LINE__);
 #elif defined(TARGET_M68K)
-        if (!newsp)
-            newsp = env->aregs[7];
-        new_env->aregs[7] = newsp;
+        new_env->aregs[7] = new_stk_addr;
         new_env->dregs[0] = 0;
         /* ??? is this sufficient?  */
 #elif defined(TARGET_MIPS)
-        if (!newsp)
-            newsp = env->gpr[29][env->current_tc];
-        new_env->gpr[29][env->current_tc] = newsp;
+        new_env->gpr[29][env->current_tc] = new_stk_addr;
 #elif defined(TARGET_PPC)
-        if (!newsp)
-            newsp = env->gpr[1];
-        new_env->gpr[1] = newsp;
+        new_env->gpr[1] = new_stk_addr;
         {
             int i;
             for (i = 7; i < 32; i++)
                 new_env->gpr[i] = 0;
         }
 #elif defined(TARGET_SH4)
-	if (!newsp)
-	  newsp = env->gregs[15];
-	new_env->gregs[15] = newsp;
+	new_env->gregs[15] = new_stk_addr;
 	/* XXXXX */
 #elif defined(TARGET_ALPHA)
-       if (!newsp)
-         newsp = env->ir[30];
-       new_env->ir[30] = newsp;
+       new_env->ir[30] = new_stk_addr;
         /* ? */
         {
             int i;
@@ -2876,23 +2893,71 @@
                 new_env->ir[i] = 0;
         }
 #elif defined(TARGET_CRIS)
-	if (!newsp)
-	  newsp = env->regs[14];
-	new_env->regs[14] = newsp;
+	new_env->regs[14] = new_stk_addr;
 #else
 #error unsupported target CPU
 #endif
         new_env->opaque = ts;
+#ifdef USE_NPTL
+        nptl_flags = flags;
+        flags &= ~CLONE_NPTL_FLAGS2;
+
+        if (nptl_flags & CLONE_CHILD_CLEARTID) {
+            ts->child_tid_addr = child_tid_addr;
+        }
+
+        if (nptl_flags & CLONE_SETTLS)
+            cpu_set_tls(new_env, newtls_addr);
+
+        /* Grab the global cpu lock so that the thread setup appears
+           atomic.  */
+        if (nptl_flags & CLONE_CHILD_SETTID)
+            spin_lock(&nptl_lock);
+
+#else
+        if (flags & CLONE_NPTL_FLAGS2)
+            return -EINVAL;
+#endif
 #ifdef __ia64__
         ret = __clone2(clone_func, new_stack + NEW_STACK_SIZE, flags, new_env);
 #else
 	ret = clone(clone_func, new_stack + NEW_STACK_SIZE, flags, new_env);
 #endif
+#ifdef USE_NPTL
+        if (ret != -1) {
+            if (nptl_flags & CLONE_CHILD_SETTID)
+                if (put_user_s32(ret, child_tid_addr))
+                    return -TARGET_EFAULT;
+        }
+
+        /* Allow the child to continue.  */
+        if (nptl_flags & CLONE_CHILD_SETTID)
+            spin_unlock(&nptl_lock);
+#endif
     } else {
         /* if no CLONE_VM, we consider it is a fork */
-        if ((flags & ~CSIGNAL) != 0)
+        if ((flags & ~(CSIGNAL | CLONE_NPTL_FLAGS2)) != 0)
             return -EINVAL;
         ret = fork();
+#ifdef USE_NPTL
+        /* There is a race condition here.  The parent process could
+           theoretically read the TID in the child process before the child
+           tid is set.  This would require using either ptrace
+           (not implemented) or having *_tidptr to point at a shared memory
+           mapping.  We can't repeat the spinlock hack used above because
+           the child process gets its own copy of the lock.  */
+        if (ret == 0) {
+            /* Child Process.  */
+            if (flags & CLONE_CHILD_SETTID)
+                if (put_user_s32(gettid(), child_tid_addr))
+                    return -TARGET_EFAULT;
+            ts = (TaskState *)env->opaque;
+            if (flags & CLONE_CHILD_CLEARTID)
+                ts->child_tid_addr = child_tid_addr;
+            if (flags & CLONE_SETTLS)
+                cpu_set_tls(env, newtls_addr);
+        }
+#endif
     }
     return ret;
 }
@@ -3370,7 +3435,7 @@
         ret = do_brk(arg1);
         break;
     case TARGET_NR_fork:
-        ret = get_errno(do_fork(cpu_env, SIGCHLD, 0));
+        ret = get_errno(do_fork(cpu_env, SIGCHLD, 0, 0, 0, 0));
         break;
 #ifdef TARGET_NR_waitpid
     case TARGET_NR_waitpid:
@@ -4726,7 +4791,7 @@
         ret = get_errno(fsync(arg1));
         break;
     case TARGET_NR_clone:
-        ret = get_errno(do_fork(cpu_env, arg1, arg2));
+        ret = get_errno(do_fork(cpu_env, arg1, arg2, arg3, arg4, arg5));
         break;
 #ifdef __NR_exit_group
         /* new thread calls */
@@ -5152,7 +5217,9 @@
 #endif
 #ifdef TARGET_NR_vfork
     case TARGET_NR_vfork:
-        ret = get_errno(do_fork(cpu_env, CLONE_VFORK | CLONE_VM | SIGCHLD, 0));
+        ret = get_errno(do_fork(cpu_env,
+                                CLONE_VFORK | CLONE_VM | SIGCHLD,
+                                0, 0, 0, 0));
         break;
 #endif
 #ifdef TARGET_NR_ugetrlimit
Index: qemu/qspinlock.h
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ qemu/qspinlock.h	2007-12-11 10:16:50.000000000 -0700
@@ -0,0 +1,188 @@
+/*
+ * Atomic operation helper include
+ *
+ *  Copyright (c) 2005 Fabrice Bellard
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#ifndef QSPINLOCK_H
+#define QSPINLOCK_H
+
+#if defined(__powerpc__)
+static inline int testandset (int *p)
+{
+    int ret;
+    __asm__ __volatile__ (
+                          "0:    lwarx %0,0,%1\n"
+                          "      xor. %0,%3,%0\n"
+                          "      bne 1f\n"
+                          "      stwcx. %2,0,%1\n"
+                          "      bne- 0b\n"
+                          "1:    "
+                          : "=&r" (ret)
+                          : "r" (p), "r" (1), "r" (0)
+                          : "cr0", "memory");
+    return ret;
+}
+#elif defined(__i386__)
+static inline int testandset (int *p)
+{
+    long int readval = 0;
+
+    __asm__ __volatile__ ("lock; cmpxchgl %2, %0"
+                          : "+m" (*p), "+a" (readval)
+                          : "r" (1)
+                          : "cc");
+    return readval;
+}
+#elif defined(__x86_64__)
+static inline int testandset (int *p)
+{
+    long int readval = 0;
+
+    __asm__ __volatile__ ("lock; cmpxchgl %2, %0"
+                          : "+m" (*p), "+a" (readval)
+                          : "r" (1)
+                          : "cc");
+    return readval;
+}
+#elif defined(__s390__)
+static inline int testandset (int *p)
+{
+    int ret;
+
+    __asm__ __volatile__ ("0: cs    %0,%1,0(%2)\n"
+                          "   jl    0b"
+                          : "=&d" (ret)
+                          : "r" (1), "a" (p), "0" (*p)
+                          : "cc", "memory" );
+    return ret;
+}
+#elif defined(__alpha__)
+static inline int testandset (int *p)
+{
+    int ret;
+    unsigned long one;
+
+    __asm__ __volatile__ ("0:	mov 1,%2\n"
+                          "	ldl_l %0,%1\n"
+                          "	stl_c %2,%1\n"
+                          "	beq %2,1f\n"
+                          ".subsection 2\n"
+                          "1:	br 0b\n"
+                          ".previous"
+                          : "=r" (ret), "=m" (*p), "=r" (one)
+                          : "m" (*p));
+    return ret;
+}
+#elif defined(__sparc__)
+static inline int testandset (int *p)
+{
+        int ret;
+
+        __asm__ __volatile__("ldstub	[%1], %0"
+                             : "=r" (ret)
+                             : "r" (p)
+                             : "memory");
+
+        return (ret ? 1 : 0);
+}
+#elif defined(__arm__)
+static inline int testandset (int *spinlock)
+{
+    register unsigned int ret;
+    __asm__ __volatile__("swp %0, %1, [%2]"
+                         : "=r"(ret)
+                         : "0"(1), "r"(spinlock));
+
+    return ret;
+}
+#elif defined(__mc68000)
+static inline int testandset (int *p)
+{
+    char ret;
+    __asm__ __volatile__("tas %1; sne %0"
+                         : "=r" (ret)
+                         : "m" (p)
+                         : "cc","memory");
+    return ret;
+}
+#elif defined(__ia64)
+
+#include <ia64intrin.h>
+
+static inline int testandset (int *p)
+{
+    return __sync_lock_test_and_set (p, 1);
+}
+#elif defined(__mips__)
+static inline int testandset (int *p)
+{
+    int ret;
+
+    __asm__ __volatile__ (
+        "	.set push		\n"
+        "	.set noat		\n"
+        "	.set mips2		\n"
+        "1:	li	$1, 1		\n"
+        "	ll	%0, %1		\n"
+        "	sc	$1, %1		\n"
+        "	beqz	$1, 1b		\n"
+        "	.set pop		"
+        : "=r" (ret), "+R" (*p)
+        :
+        : "memory");
+
+    return ret;
+}
+#else
+#error unimplemented CPU support
+#endif
+
+typedef int spinlock_t;
+
+#define SPIN_LOCK_UNLOCKED 0
+
+#if defined(CONFIG_USER_ONLY)
+static inline void spin_lock(spinlock_t *lock)
+{
+    while (testandset(lock));
+}
+
+static inline void spin_unlock(spinlock_t *lock)
+{
+    *lock = 0;
+}
+
+static inline int spin_trylock(spinlock_t *lock)
+{
+    return !testandset(lock);
+}
+#else
+static inline void spin_lock(spinlock_t *lock)
+{
+}
+
+static inline void spin_unlock(spinlock_t *lock)
+{
+}
+
+static inline int spin_trylock(spinlock_t *lock)
+{
+    return 1;
+}
+#endif
+
+#endif /* QSPINLOCK_H */
Index: qemu/target-arm/cpu.h
===================================================================
--- qemu.orig/target-arm/cpu.h	2007-12-11 10:16:49.000000000 -0700
+++ qemu/target-arm/cpu.h	2007-12-11 10:16:50.000000000 -0700
@@ -37,7 +37,11 @@
 #define EXCP_IRQ             5
 #define EXCP_FIQ             6
 #define EXCP_BKPT            7
+#if defined(CONFIG_USER_ONLY)
+#define EXCP_KERNEL_TRAP     8   /* Jumped to kernel code page.  */
+#else
 #define EXCP_EXCEPTION_EXIT  8   /* Return from v7M exception.  */
+#endif
 
 #define ARMV7M_EXCP_RESET   1
 #define ARMV7M_EXCP_NMI     2
@@ -221,6 +225,12 @@
 
 void cpu_lock(void);
 void cpu_unlock(void);
+#if defined(USE_NPTL)
+static inline void cpu_set_tls(CPUARMState *env, uint32_t newtls_addr)
+{
+    env->cp15.c13_tls3 = newtls_addr;
+}
+#endif
 
 #define CPSR_M (0x1f)
 #define CPSR_T (1 << 5)
Index: qemu/target-arm/op.c
===================================================================
--- qemu.orig/target-arm/op.c	2007-12-11 10:16:49.000000000 -0700
+++ qemu/target-arm/op.c	2007-12-11 10:16:50.000000000 -0700
@@ -1003,11 +1003,19 @@
     cpu_loop_exit();
 }
 
+#if !defined(CONFIG_USER_ONLY)
 void OPPROTO op_exception_exit(void)
 {
     env->exception_index = EXCP_EXCEPTION_EXIT;
     cpu_loop_exit();
 }
+#else
+void OPPROTO op_kernel_trap(void)
+{
+    env->exception_index = EXCP_KERNEL_TRAP;
+    cpu_loop_exit();
+}
+#endif /* defined(CONFIG_USER_ONLY) */
 
 /* VFP support.  We follow the convention used for VFP instrunctions:
    Single precition routines have a "s" suffix, double precision a
Index: qemu/target-arm/translate.c
===================================================================
--- qemu.orig/target-arm/translate.c	2007-12-11 10:16:49.000000000 -0700
+++ qemu/target-arm/translate.c	2007-12-11 10:16:50.000000000 -0700
@@ -7513,13 +7513,20 @@
     if (env->condexec_bits)
       gen_op_set_condexec(0);
     do {
-#ifndef CONFIG_USER_ONLY
+#if defined(CONFIG_USER_ONLY)
+        /* Intercept jump to the magic kernel page.  */
+        if (dc->pc > 0xffff0000) {
+            gen_op_kernel_trap();
+            dc->is_jmp = DISAS_UPDATE;
+            break;
+        }
+#else /* !defined(CONFIG_USER_ONLY) */
         if (dc->pc >= 0xfffffff0 && IS_M(env)) {
             /* We always get here via a jump, so know we are not in a
                conditional execution block.  */
             gen_op_exception_exit();
         }
-#endif
+#endif /* !defined(CONFIG_USER_ONLY) */
 
         if (env->nb_breakpoints > 0) {
             for(j = 0; j < env->nb_breakpoints; j++) {
Index: qemu/arm.ld
===================================================================
--- qemu.orig/arm.ld	2007-12-11 10:16:49.000000000 -0700
+++ qemu/arm.ld	2007-12-11 10:16:50.000000000 -0700
@@ -26,6 +26,10 @@
     { *(.rel.rodata) *(.rel.gnu.linkonce.r*) }
   .rela.rodata   :
     { *(.rela.rodata) *(.rela.gnu.linkonce.r*) }
+  .rel.tdata     : { *(.rel.tdata .rel.tdata.* .rel.gnu.linkonce.td.*) }
+  .rela.tdata    : { *(.rela.tdata .rela.tdata.* .rela.gnu.linkonce.td.*) }
+  .rel.tbss      : { *(.rel.tbss .rel.tbss.* .rel.gnu.linkonce.tb.*) }
+  .rela.tbss     : { *(.rela.tbss .rela.tbss.* .rela.gnu.linkonce.tb.*) }
   .rel.got       : { *(.rel.got)		}
   .rela.got      : { *(.rela.got)		}
   .rel.ctors     : { *(.rel.ctors)	}
Index: qemu/target-ppc/cpu.h
===================================================================
--- qemu.orig/target-ppc/cpu.h	2007-12-11 10:16:49.000000000 -0700
+++ qemu/target-ppc/cpu.h	2007-12-11 10:16:50.000000000 -0700
@@ -712,6 +712,12 @@
 void do_interrupt (CPUPPCState *env);
 void ppc_hw_interrupt (CPUPPCState *env);
 void cpu_loop_exit (void);
+#if defined(USE_NPTL)
+static inline void cpu_set_tls(CPUPPCState *env, ppc_gpr_t newtls_addr)
+{
+    env->gpr[2] = newtls_addr;
+}
+#endif
 
 void dump_stack (CPUPPCState *env);
 

^ permalink raw reply	[flat|nested] 11+ messages in thread
end of thread, other threads:[~2008-05-05 15:12 UTC | newest]

Thread overview: 11+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2007-12-12  0:44 [Qemu-devel] [PATCH] arm eabi TLS Thayne Harbaugh
2007-12-12  1:29 ` Paul Brook
2007-12-12 23:03 ` Fabrice Bellard
2007-12-13  1:21   ` Paul Brook
2007-12-13  1:15     ` Thayne Harbaugh
2008-01-28 18:27       ` Felipe Contreras
2008-04-04 15:03         ` Marc-André Lureau
2008-04-04 17:48           ` Stuart Anderson
2008-05-05 15:12           ` Felipe Contreras
2007-12-13  8:57     ` Fabrice Bellard
2007-12-13 13:28     ` Daniel Jacobowitz

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