diff options
Diffstat (limited to 'arch/blackfin/mach-common/head.S')
| -rw-r--r-- | arch/blackfin/mach-common/head.S | 66 |
1 files changed, 19 insertions, 47 deletions
diff --git a/arch/blackfin/mach-common/head.S b/arch/blackfin/mach-common/head.S index f123a62e245..42ee2b1831b 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 |