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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