microblaze: switch to generic fork/vfork/clone

[deliverable/linux.git] / arch / microblaze / kernel / entry.S

diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index 03f7b8ce6b6bcc6968816b1ef09d50401a35ee21..c217367dfc7b31d14ecf138f2cee3371e8aa0251 100644 (file)
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@@ -293,24 +293,6 @@ C_ENTRY(_user_exception):
        swi     r1, r0, TOPHYS(PER_CPU(ENTRY_SP)) /* save stack */
        addi    r14, r14, 4     /* return address is 4 byte after call */
 
-       mfs     r1, rmsr
-       nop
-       andi    r1, r1, MSR_UMS
-       bnei    r1, 1f
-
-/* Kernel-mode state save - kernel execve */
-       lwi     r1, r0, TOPHYS(PER_CPU(ENTRY_SP)); /* Reload kernel stack-ptr*/
-       tophys(r1,r1);
-
-       addik   r1, r1, -PT_SIZE; /* Make room on the stack. */
-       SAVE_REGS
-
-       swi     r1, r1, PT_MODE; /* pt_regs -> kernel mode */
-       brid    2f;
-       nop;                            /* Fill delay slot */
-
-/* User-mode state save.  */
-1:
        lwi     r1, r0, TOPHYS(PER_CPU(CURRENT_SAVE)); /* get saved current */
        tophys(r1,r1);
        lwi     r1, r1, TS_THREAD_INFO; /* get stack from task_struct */
@@ -460,18 +442,6 @@ TRAP_return:               /* Make global symbol for debugging */
        nop;
 
 
-/* These syscalls need access to the struct pt_regs on the stack, so we
-   implement them in assembly (they're basically all wrappers anyway).  */
-
-C_ENTRY(sys_fork_wrapper):
-       addi    r5, r0, SIGCHLD                 /* Arg 0: flags */
-       lwi     r6, r1, PT_R1   /* Arg 1: child SP (use parent's) */
-       addik   r7, r1, 0                       /* Arg 2: parent context */
-       add     r8, r0, r0                      /* Arg 3: (unused) */
-       add     r9, r0, r0;                     /* Arg 4: (unused) */
-       brid    do_fork         /* Do real work (tail-call) */
-       add     r10, r0, r0;                    /* Arg 5: (unused) */
-
 /* This the initial entry point for a new child thread, with an appropriate
    stack in place that makes it look the the child is in the middle of an
    syscall.  This function is actually `returned to' from switch_thread
@@ -479,28 +449,19 @@ C_ENTRY(sys_fork_wrapper):
    saved context).  */
 C_ENTRY(ret_from_fork):
        bralid  r15, schedule_tail; /* ...which is schedule_tail's arg */
-       add     r3, r5, r0;     /* switch_thread returns the prev task */
+       add     r5, r3, r0;     /* switch_thread returns the prev task */
                                /* ( in the delay slot ) */
        brid    ret_from_trap;  /* Do normal trap return */
        add     r3, r0, r0;     /* Child's fork call should return 0. */
 
-C_ENTRY(sys_vfork):
-       brid    microblaze_vfork        /* Do real work (tail-call) */
-       addik   r5, r1, 0
-
-C_ENTRY(sys_clone):
-       bnei    r6, 1f;                 /* See if child SP arg (arg 1) is 0. */
-       lwi     r6, r1, PT_R1;  /* If so, use paret's stack ptr */
-1:     addik   r7, r1, 0;                      /* Arg 2: parent context */
-       lwi     r9, r1, PT_R8;          /* parent tid.  */
-       lwi     r10, r1, PT_R9;         /* child tid.  */
-       /* do_fork will pick up TLS from regs->r10.  */
-       brid    do_fork         /* Do real work (tail-call) */
-       add     r8, r0, r0;             /* Arg 3: (unused) */
-
-C_ENTRY(sys_execve):
-       brid    microblaze_execve;      /* Do real work (tail-call).*/
-       addik   r8, r1, 0;              /* add user context as 4th arg */
+C_ENTRY(ret_from_kernel_thread):
+       bralid  r15, schedule_tail; /* ...which is schedule_tail's arg */
+       add     r5, r3, r0;     /* switch_thread returns the prev task */
+                               /* ( in the delay slot ) */
+       brald   r15, r20        /* fn was left in r20 */
+       addk    r5, r0, r19     /* ... and argument - in r19 */
+       brid    ret_from_trap
+       add     r3, r0, r0
 
 C_ENTRY(sys_rt_sigreturn_wrapper):
        brid    sys_rt_sigreturn        /* Do real work */