Changeset b2d191e in rtems

Timestamp:

05/14/14 08:23:18 (10 years ago)

Author:

Sebastian Huber <sebastian.huber@…>

Branches:

4.11, 5, master

Children:

249eaf9

Parents:

3730a07f

git-author:

Sebastian Huber <sebastian.huber@…> (05/14/14 08:23:18)

git-committer:

Sebastian Huber <sebastian.huber@…> (05/14/14 12:46:20)

Message:

bsps/sparc: Fix data copy in start procedure

Use the register %g4 for the data content since it must be an even
numbered register due to the std/ldd. Use the register %g2 for the BSS
start address, so that it can be later re-used for the BSS zero loop.

File:

• c/src/lib/libbsp/sparc/shared/start/start.S (modified) (1 diff)

c/src/lib/libbsp/sparc/shared/start/start.S

@@ -320 +320 @@
          */
 
-        sethi %hi(_endtext),%g2
-        or    %g2,%lo(_endtext),%g2     ! g2 = start of initialized data in ROM
+        sethi %hi(_endtext),%g1
+        or    %g1,%lo(_endtext),%g1     ! g1 = start of initialized data in ROM
 
         sethi %hi(_data_start),%g3
         or    %g3,%lo(_data_start),%g3  ! g3 = start of initialized data in RAM
 
-        sethi %hi(__bss_start),%g4
-        or    %g4,%lo(__bss_start),%g4  ! g4 = end of initialized data in RAM
-
-        cmp   %g2, %g3
+        sethi %hi(__bss_start), %g2
+        or    %g2,%lo(__bss_start),%g2  ! g2 = end of initialized data in RAM
+
+        cmp   %g1, %g3
         be    1f
         nop
 
 copy_data:
-        ldd   [ %g2 ], %g5
-        std   %g5 , [ %g3 ]             ! copy this double word
+        ldd   [%g1], %g4
+        std   %g4 , [%g3]               ! copy this double word
         add   %g3, 8, %g3               ! bump the destination pointer
-        add   %g2, 8, %g2               ! bump the source pointer
-        cmp   %g3, %g4                  ! Is the pointer past the end of dest?
+        add   %g1, 8, %g1               ! bump the source pointer
+        cmp   %g3, %g2                  ! Is the pointer past the end of dest?
         bl    copy_data
         nop