Blackfin arch: unify duplicated bss init code
Mike Frysinger [Mon, 27 Oct 2008 10:17:41 +0000 (18:17 +0800)]
Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>

arch/blackfin/mach-common/head.S

index f123a62..42ee2b1 100644 (file)
@@ -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