Blackfin arch: unify duplicated bss init code

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

1 files changed, 19 insertions, 47 deletions

diff --git a/arch/blackfin/mach-common/head.S b/arch/blackfin/mach-common/head.S
index f123a62e2451..42ee2b1831bb 100644
--- a/arch/blackfin/mach-common/head.S
+++ b/arch/blackfin/mach-common/head.S
@@ -195,6 +195,19 @@ ENDPROC(__start)
 # define WDOG_CTL WDOGA_CTL
 #endif
 
+ENTRY(__init_clear_bss)
+        r2 = r2 - r1;
+        cc = r2 == 0;
+        if cc jump .L_bss_done;
+        r2 >>= 2;
+        p1 = r1;
+        p2 = r2;
+        lsetup (1f, 1f) lc0 = p2;
+1:      [p1++] = r0;
+.L_bss_done:
+        rts;
+ENDPROC(__init_clear_bss)
+
 ENTRY(_real_start)
         /* Enable nested interrupts */
         [--sp] = reti;
@@ -206,75 +219,34 @@ ENTRY(_real_start)
         w[p0] = r0;
         ssync;
 
+        r0 = 0 (x);
+        /* Zero out all of the fun bss regions */
 #if L1_DATA_A_LENGTH > 0
         r1.l = __sbss_l1;
         r1.h = __sbss_l1;
         r2.l = __ebss_l1;
         r2.h = __ebss_l1;
-        r0 = 0 (z);
-        r2 = r2 - r1;
-        cc = r2 == 0;
-        if cc jump .L_a_l1_done;
-        r2 >>= 2;
-        p1 = r1;
-        p2 = r2;
-        lsetup (.L_clear_a_l1, .L_clear_a_l1 ) lc0 = p2;
-.L_clear_a_l1:
-        [p1++] = r0;
-.L_a_l1_done:
+        call __init_clear_bss
 #endif
-
 #if L1_DATA_B_LENGTH > 0
         r1.l = __sbss_b_l1;
         r1.h = __sbss_b_l1;
         r2.l = __ebss_b_l1;
         r2.h = __ebss_b_l1;
-        r0 = 0 (z);
-        r2 = r2 - r1;
-        cc = r2 == 0;
-        if cc jump .L_b_l1_done;
-        r2 >>= 2;
-        p1 = r1;
-        p2 = r2;
-        lsetup (.L_clear_b_l1, .L_clear_b_l1 ) lc0 = p2;
-.L_clear_b_l1:
-        [p1++] = r0;
-.L_b_l1_done:
+        call __init_clear_bss
 #endif
-
 #if L2_LENGTH > 0
         r1.l = __sbss_l2;
         r1.h = __sbss_l2;
         r2.l = __ebss_l2;
         r2.h = __ebss_l2;
-        r0 = 0 (z);
-        r2 = r2 - r1;
-        cc = r2 == 0;
-        if cc jump .L_l2_done;
-        r2 >>= 2;
-        p1 = r1;
-        p2 = r2;
-        lsetup (.L_clear_l2, .L_clear_l2 ) lc0 = p2;
-.L_clear_l2:
-        [p1++] = r0;
-.L_l2_done:
+        call __init_clear_bss
 #endif
-
-        /* Zero out the bss region
-         * Note: this will fail if bss is 0 bytes ...
-         */
-        r0 = 0 (z);
         r1.l = ___bss_start;
         r1.h = ___bss_start;
         r2.l = ___bss_stop;
         r2.h = ___bss_stop;
-        r2 = r2 - r1;
-        r2 >>= 2;
-        p1 = r1;
-        p2 = r2;
-        lsetup (.L_clear_bss, .L_clear_bss) lc0 = p2;
-.L_clear_bss:
-        [p1++] = r0;
+        call __init_clear_bss
 
         /* In case there is a NULL pointer reference,
          * zero out region before stext