Hello,
I am examining the generated assembly of my toy program for msp430 and I think
I might be do something incorrectly. Regardless, I would like to fix this.
Here is a portion of the listing using objdump -d <my_executable>. I will
annotate the call addresses with the symbol name:
0000813e <PreMainInner>:
813e: b0 12 d6 81 call #33238 ;#0x81d6 systemInit000
8142: b0 12 42 82 call #33346 ;#0x8242 stdlib_macrosDatInit000
8146: b0 12 e0 81 call #33248 ;#0x81e0
unknown_msp430DatInit000
814a: b0 12 46 82 call #33350 ;#0x8246
unknown_iomacrosDatInit000
814e: b0 12 e4 81 call #33252 ;#0x81e4
unknown_msp430f5510DatInit000
8152: b0 12 3e 82 call #33342 ;#0x823e unknown_ringDatInit000
8156: b0 12 40 82 call #33344 ;#0x8240 stdlib_macrosInit000
815a: b0 12 de 81 call #33246 ;#0x81de unknown_msp430Init000
815e: b0 12 44 82 call #33348 ;#0x8244 unknown_iomacrosInit000
8162: b0 12 e2 81 call #33250 ;#0x81e2
unknown_msp430f5510Init000
8166: b0 12 3c 82 call #33340 ;#0x823c unknown_ringInit000
816a: 30 41 ret
The first one moves a zero into the symbol nimvm_IAxmsqnME4Jmed24hOgrFQ. Not
sure what that is exactly. It is never referenced again in the executable as
far as I can tell.
The others do nothing except return.That is an awful lot of wasted bytes.
Except for the stdlib_... symbols, the others are the names of the nim files
I've included in the compilation.
Am I doing something wrong to generate these extra routines? I plan to get this
in a public repo but I would like to iron out the major kinks first. I would
have imagined that the dead code elimination would have removed those routines.
Here is my makefile:
MCU=msp430f5510
SUPPORT_FILES=gcc/include/
GDB=gcc/bin/msp430-elf-gdb
GDB_CONSOLE=gcc/bin/gdb_agent_console
MSP430_DAT=gcc/msp430.dat
HEADERS=msp430.nim msp430f5510.nim iomacros.nim
CODEFILES=blink.nim ring.nim
NIMFLAGS=-d:release --os:standalone --opt:size --gc:none --deadCodeElim:on
-d:StandaloneHeapSize=0
# avr is the closest cpu for the moment
NIMFLAGS+=--cpu:avr
# running one C compiler lets its errors show
NIMFLAGS+=--parallelBuild:1 --verbosity:2
#location of include files
NIMFLAGS+=--passC:"-mmcu=$(MCU) -I=$(SUPPORT_FILES) -L=$(SUPPORT_FILES)"
NIMFLAGS+=--passL:"-mmcu=$(MCU) -I=$(SUPPORT_FILES) -L=$(SUPPORT_FILES)"
%: %.nim panicoverride.nim
nim c $(NIMFLAGS) $<
blink: $(HEADERS) $(CODEFILES)
all: blink
listing: blink
gcc/bin/msp430-elf-objdump -d blink > asm.lst &&
gcc/bin/msp430-elf-objdump -x blink >> asm.lst
debugserver:
$(GDB_CONSOLE) $(MSP430_DAT) &> ./gdb_agent_console.log &
debug:
$(GDB) blink -ex "target remote :55000"
.PHONY: debug debugserver
