sparc32: drop sun4c specific stack validation

This allows us to kill run-time patching for this function too

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/arch/sparc/kernel/wuf.S b/arch/sparc/kernel/wuf.S
index 779ff75..9fde91a 100644 (file)
--- a/arch/sparc/kernel/wuf.S
+++ b/arch/sparc/kernel/wuf.S
@@ -131,12 +131,9 @@ fwin_from_user:
 
        /* LOCATION: Window 'W' */
 
-       /* Branch to the architecture specific stack validation
-        * routine.  They can be found below...
-        */
-       .globl  fwin_mmu_patchme
-fwin_mmu_patchme:      b       sun4c_fwin_stackchk
-                                andcc  %sp, 0x7, %g0
+       /* Branch to the stack validation routine */
+       b       srmmu_fwin_stackchk
+        andcc  %sp, 0x7, %g0
 
 #define STACK_OFFSET (THREAD_SIZE - TRACEREG_SZ - STACKFRAME_SZ)
 
@@ -242,57 +239,6 @@ fwin_user_finish_up:
         * 'someone elses' window possibly.
         */
 
-       .align  4
-sun4c_fwin_stackchk:
-       /* LOCATION: Window 'W' */
-
-       /* Caller did 'andcc %sp, 0x7, %g0' */
-       be      1f
-        and    %sp, 0xfff, %l0         ! delay slot
-
-       b,a     fwin_user_stack_is_bolixed
-
-       /* See if we have to check the sanity of one page or two */
-1:
-       add     %l0, 0x38, %l0
-       sra     %sp, 29, %l5
-       add     %l5, 0x1, %l5
-       andncc  %l5, 0x1, %g0
-       be      1f
-        andncc %l0, 0xff8, %g0
-
-       b,a     fwin_user_stack_is_bolixed      /* %sp is in vma hole, yuck */
-
-1:
-       be      sun4c_fwin_onepage      /* Only one page to check */
-        lda    [%sp] ASI_PTE, %l1
-sun4c_fwin_twopages:
-       add     %sp, 0x38, %l0
-       sra     %l0, 29, %l5
-       add     %l5, 0x1, %l5
-       andncc  %l5, 0x1, %g0
-       be      1f
-        lda    [%l0] ASI_PTE, %l1
-
-       b,a     fwin_user_stack_is_bolixed      /* Second page in vma hole */
-
-1:
-       srl     %l1, 29, %l1
-       andcc   %l1, 0x4, %g0
-       bne     sun4c_fwin_onepage
-        lda    [%sp] ASI_PTE, %l1      
-
-       b,a     fwin_user_stack_is_bolixed      /* Second page has bad perms */
-
-sun4c_fwin_onepage:
-       srl     %l1, 29, %l1
-       andcc   %l1, 0x4, %g0
-       bne     fwin_user_stack_is_ok
-        nop
-
-       /* A page had bad page permissions, losing... */
-       b,a     fwin_user_stack_is_bolixed
-
        .globl  srmmu_fwin_stackchk
 srmmu_fwin_stackchk:
        /* LOCATION: Window 'W' */

diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index 7fd4cc3..d76af19 100644 (file)
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -2145,7 +2145,6 @@ static void __init patch_window_trap_handlers(void)
        unsigned long *iaddr, *daddr;
        
        PATCH_BRANCH(spwin_mmu_patchme, spwin_srmmu_stackchk);
-       PATCH_BRANCH(fwin_mmu_patchme, srmmu_fwin_stackchk);
        PATCH_BRANCH(tsetup_mmu_patchme, tsetup_srmmu_stackchk);
        PATCH_BRANCH(rtrap_mmu_patchme, srmmu_rett_stackchk);
 }