vserver 1.9.5.x5

[linux-2.6.git] / arch / mips / kernel / process.c

diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 4bb61f3..6e70c42 100644 (file)
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -5,6 +5,7 @@
  *
  * Copyright (C) 1994 - 1999, 2000 by Ralf Baechle and others.
  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2004 Thiemo Seufer
  */
 #include <linux/config.h>
 #include <linux/errno.h>
@@ -75,7 +76,7 @@ void start_thread(struct pt_regs * regs, unsigned long pc, unsigned long sp)
 #endif
        status |= KU_USER;
        regs->cp0_status = status;
-       current->used_math = 0;
+       clear_used_math();
        lose_fpu();
        regs->cp0_epc = pc;
        regs->regs[29] = sp;
@@ -99,28 +100,28 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 
        childksp = (unsigned long)ti + THREAD_SIZE - 32;
 
+       preempt_disable();
+
        if (is_fpu_owner()) {
                save_fp(p);
        }
 
+       preempt_enable();
+
        /* set up new TSS. */
        childregs = (struct pt_regs *) childksp - 1;
        *childregs = *regs;
        childregs->regs[7] = 0; /* Clear error flag */
 
-#ifdef CONFIG_BINFMT_IRIX
+#if defined(CONFIG_BINFMT_IRIX)
        if (current->personality != PER_LINUX) {
                /* Under IRIX things are a little different. */
-               childregs->regs[2] = 0;
                childregs->regs[3] = 1;
-               regs->regs[2] = p->pid;
                regs->regs[3] = 0;
-       } else
-#endif
-       {
-               childregs->regs[2] = 0; /* Child gets zero as return value */
-               regs->regs[2] = p->pid;
        }
+#endif
+       childregs->regs[2] = 0; /* Child gets zero as return value */
+       regs->regs[2] = p->pid;
 
        if (childregs->cp0_status & ST0_CU0) {
                childregs->regs[28] = (unsigned long) ti;
@@ -140,7 +141,6 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
        p->thread.cp0_status = read_c0_status() & ~(ST0_CU2|ST0_CU1);
        childregs->cp0_status &= ~(ST0_CU2|ST0_CU1);
        clear_tsk_thread_flag(p, TIF_USEDFPU);
-       p->set_child_tid = p->clear_child_tid = NULL;
 
        return 0;
 }
@@ -149,45 +149,66 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long usp,
 int dump_fpu(struct pt_regs *regs, elf_fpregset_t *r)
 {
        memcpy(r, &current->thread.fpu, sizeof(current->thread.fpu));
+
+       return 1;
+}
+
+void dump_regs(elf_greg_t *gp, struct pt_regs *regs)
+{
+       int i;
+
+       for (i = 0; i < EF_R0; i++)
+               gp[i] = 0;
+       gp[EF_R0] = 0;
+       for (i = 1; i <= 31; i++)
+               gp[EF_R0 + i] = regs->regs[i];
+       gp[EF_R26] = 0;
+       gp[EF_R27] = 0;
+       gp[EF_LO] = regs->lo;
+       gp[EF_HI] = regs->hi;
+       gp[EF_CP0_EPC] = regs->cp0_epc;
+       gp[EF_CP0_BADVADDR] = regs->cp0_badvaddr;
+       gp[EF_CP0_STATUS] = regs->cp0_status;
+       gp[EF_CP0_CAUSE] = regs->cp0_cause;
+#ifdef EF_UNUSED0
+       gp[EF_UNUSED0] = 0;
+#endif
+}
+
+int dump_task_fpu (struct task_struct *t, elf_fpregset_t *fpr)
+{
+       memcpy(fpr, &t->thread.fpu, sizeof(current->thread.fpu));
+
        return 1;
 }
 
 /*
  * Create a kernel thread
  */
+ATTRIB_NORET void kernel_thread_helper(void *arg, int (*fn)(void *))
+{
+       do_exit(fn(arg));
+}
+
 long kernel_thread(int (*fn)(void *), void *arg, unsigned long flags)
 {
-       long retval;
-
-       __asm__ __volatile__(
-               "       move    $6, $sp         \n"
-               "       move    $4, %5          \n"
-               "       li      $2, %1          \n"
-               "       syscall                 \n"
-               "       beq     $6, $sp, 1f     \n"
-#ifdef CONFIG_MIPS32   /* On o32 the caller has to create the stackframe */
-               "       subu    $sp, 32         \n"
+       struct pt_regs regs;
+
+       memset(&regs, 0, sizeof(regs));
+
+       regs.regs[4] = (unsigned long) arg;
+       regs.regs[5] = (unsigned long) fn;
+       regs.cp0_epc = (unsigned long) kernel_thread_helper;
+       regs.cp0_status = read_c0_status();
+#if defined(CONFIG_CPU_R3000) || defined(CONFIG_CPU_TX39XX)
+       regs.cp0_status &= ~(ST0_KUP | ST0_IEC);
+       regs.cp0_status |= ST0_IEP;
+#else
+       regs.cp0_status |= ST0_EXL;
 #endif
-               "       move    $4, %3          \n"
-               "       jalr    %4              \n"
-               "       move    $4, $2          \n"
-               "       li      $2, %2          \n"
-               "       syscall                 \n"
-#ifdef CONFIG_MIPS32   /* On o32 the caller has to deallocate the stackframe */
-               "       addiu   $sp, 32         \n"
-#endif
-               "1:     move    %0, $2"
-               : "=r" (retval)
-               : "i" (__NR_clone), "i" (__NR_exit), "r" (arg), "r" (fn),
-                 "r" (flags | CLONE_VM | CLONE_UNTRACED)
-                /*
-                 * The called subroutine might have destroyed any of the
-                 * at, result, argument or temporary registers ...
-                 */
-               : "$2", "$3", "$4", "$5", "$6", "$7", "$8",
-                 "$9","$10","$11","$12","$13","$14","$15","$24","$25","$31");
-
-       return retval;
+
+       /* Ok, create the new process.. */
+       return do_fork(flags | CLONE_VM | CLONE_UNTRACED, 0, &regs, 0, NULL, NULL);
 }
 
 struct mips_frame_info {
@@ -268,7 +289,6 @@ arch_initcall(frame_info_init);
  */
 unsigned long thread_saved_pc(struct task_struct *tsk)
 {
-       extern void ret_from_fork(void);
        struct thread_struct *t = &tsk->thread;
 
        /* New born processes are a special case */