[Bug binutils/16847] New: processing branch instruction in .S might be wrong

[chaujohnthan at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=16847

            Bug ID: 16847
           Summary: processing branch instruction in .S might be wrong
           Product: binutils
           Version: 2.15
            Status: NEW
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: chaujohnthan at gmail dot com

Created attachment 7554
  --> https://sourceware.org/bugzilla/attachment.cgi?id=7554&action=edit
projext files

here is my initmem.S
@ init sdram 0-16M
    mov     r0, #0
    mov     r1, #0
    mov    r2, #0x1000000
    sub     r2, r2, #0x200

init_sdram:
    str     r0, [r1], #4
    cmp    r1, r2
    bne    init_sdram
    @ .long   0xbafffffc      <-0x1a000002

init_done:
    @  .long    0xeafffffe  <-0xea000005
    b    .
=================================
here is my makefile:
CROSS-COMPILE=arm-c2-linux-gnu-

CC=$(CROSS-COMPILE)gcc -c
AS=$(CROSS-COMPILE)as
LD=$(CROSS-COMPILE)ld
OBJCOPY=$(CROSS-COMPILE)objcopy
OBJDUMP=$(CROSS-COMPILE)objdump

SOURCES_GCC := $(notdir $(wildcard $(SRC)/*.c))
SOURCES_AS := $(notdir $(wildcard $(STR)/*.S))
OBJECTS_GCC := $(SOURCES_GCC:.c=.o)
OBJECTS_AS := $(SOURCES_AS:.S=.o)

all: sstflash.bin initmem.bin

%.bin: %.os
    @echo
    @echo objcopy $< ...
    $(OBJCOPY) -O binary $< $@
    $(OBJDUMP) -M reg-names-std -d $< 


%.os : %.S
    @echo
    @echo assemble $< ...
    $(AS) $< -o $@

clean:
    rm -f *.bin cov initmem 

=================================
here is its output:
assemble initmem.S ...
arm-c2-linux-gnu-as initmem.S -o initmem.os

objcopy initmem.os ...
arm-c2-linux-gnu-objcopy -O binary initmem.os initmem.bin
arm-c2-linux-gnu-objdump -M reg-names-std -d initmem.os 

initmem.os:     file format elf32-littlearm

Disassembly of section .text:

00000000 <.text>:
   0:    e3a00000     mov    r0, #0    ; 0x0
   4:    e3a01000     mov    r1, #0    ; 0x0
   8:    e3a02401     mov    r2, #16777216    ; 0x1000000
   c:    e2422c02     sub    r2, r2, #512    ; 0x200
  10:    e4810004     str    r0, [r1], #4
  14:    e1510002     cmp    r1, r2
  18:    1a000002     bne    28 <init_done+0xc>
  1c:    ea000005     b    38 <init_done+0x1c>
==============================

i don't believe it. this gives an impression that
binutils-2.15.97 cross compile to arm, no one used it before!?
or maybe because crosstool-0.43 did sth wrong?


i downloaded binutils-2.15.tar.bz2 
   binutils-2.15.tar.bz2               31-Aug-2011 09:48   11M  
then recompiled the tool chain. no success.


waiting for ur reply.


sincerely,
johnthan chau
2014-04-16

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