X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=blobdiff_plain;f=src%2Fstdlib%2F__do_clear_bss.S;fp=src%2Fstdlib%2F__do_clear_bss.S;h=bd15762db0297e53da539234b23a78bc28323be6;hb=6f720ff00773571c2fa2d35e67bff68547617639;hp=0000000000000000000000000000000000000000;hpb=807b2dd5b7365eb87b482197af3b4a3f520c14f7;p=msp430-libc.git

diff --git a/src/stdlib/__do_clear_bss.S b/src/stdlib/__do_clear_bss.S
new file mode 100644
index 0000000..bd15762
--- /dev/null
+++ b/src/stdlib/__do_clear_bss.S
@@ -0,0 +1,21 @@
+/*****************************************************************
+ * Initialize data: clear .bss
+ * can be overwriten by user function with the same name
+ *****************************************************************/
+        .section .init4, "ax", @progbits
+
+        .weak   __do_clear_bss
+        .func   __do_clear_bss
+
+__do_clear_bss:
+        mov     #__bss_size, r15
+        tst     r15
+        jz      .L__clear_bss_end
+.L__clear_bss_loop:
+        dec     r15
+        clr.b   __bss_start(r15)    ; RAM is always in lower 64K, so 430 instruction
+                                    ; is acceptable here for 430X core too.
+        jne     .L__clear_bss_loop
+.L__clear_bss_end:
+
+        .endfunc