Hi Kyrill , Thank you for the info ,before i file a bug ,need to confirm its a bug or not .
Thank you ~Umesh On Fri, Feb 12, 2016 at 3:00 PM, Kyrill Tkachov <kyrylo.tkac...@foss.arm.com> wrote: > Hi, > > > On 12/02/16 09:19, Umesh Kalappa wrote: >> >> Hi Guys , >> >> we do have a issue with below code ,When we enabled the pie (-fpie/pie) >> option >> i.e >> >> main.c >> extern int *my_ptr ; >> >> int main() >> { >> return *my_ptr; >> } >> >> foo.s >> .syntax unified >> .cpu cortex-m0 >> .fpu softvfp >> .thumb >> .global my_ptr >> .global my_var >> .data >> .align 2 >> .type my_ptr, %object >> .size my_ptr, 4 >> my_ptr: >> .word my_var //where my_var is the linker variable >> >> custom.ld (linker script) >> /* Set stack top to end of RAM, and stack limit move down by >> 190 * size of stack_dummy section */ >> 191 my_var = 20; >> 192 __StackTop = ORIGIN(RAM) + LENGTH(RAM); >> 193 __StackLimit = __StackTop - SIZEOF(.stack_dummy); >> 194 PROVIDE(__stack = __StackTop); >> >> >> command used >> >> 3 arm-none-eabi-gcc -c -fPIC main.c -mthumb -mcpu=cortex-m0 >> 4 >> 5 arm-none-eabi-gcc -c -fPIC foo.S -mthumb -mcpu=cortex-m0 >> 6 arm-none-eabi-gcc -c -fPIC >> >> /home/egoumal/Downloads/gcc-arm-none-eabi-5_2-2015q4/share/gcc-arm-none-eabi/samples/startup/startu >> p_ARMCM0.S -mthumb -mcpu=cortex-m0 -D__STARTUP_CLEAR_BSS >> -D__START=main >> 7 >> 8 arm-none-eabi-ld -pie main.o foo.o startup_ARMCM0.o -L. >> -L/home/egoumal/Downloads/gcc-arm-none-eabi-5_2-2015q4/share/gcc-ar >> m-none-eabi/samples/ldscripts -T nokeep.ld -Map=test.map -o test >> >> we expect my_ptr value to be 20 ,but we do see the value 0 and without >> pie option ,the my_ptr has the value 20 . >> >> do we missing something here or value 0 expected (which is incorrect) > > > note that gcc-bugs is the list where the automatic bug tracker sends all the > emails > logging almost all activity, so your email would be lost there... > Please file a bug report in bugzilla according to https://gcc.gnu.org/bugs/ > > Thanks, > Kyrill > > >> >> Thank you and appreciate any lights on this >> ~Umesh >> >