On Fri, May 04, 2018 at 02:23:02PM +0200, Mathieu Malaterre wrote: > On Fri, May 4, 2018 at 2:16 PM, Segher Boessenkool > <segher@xxxxxxxxxxxxxxxxxxx> wrote: > > On Fri, May 04, 2018 at 01:45:35PM +0200, Mathieu Malaterre wrote: > >> $ gcc -static -ffreestanding -nostartfiles -s -o tiny tiny.c > >> $ ./tiny > >> Segmentation fault > >> > >> What do I need to pay attention to on ppc to build tiny executable > >> using the _start function ? > > > > You need to set up r13. This is powerpc64? (32-bit works fine for me, > > but you may be using a different ABI, you didn't tell. I'm on Linux). > > Nope, ppc32. > > $ objdump -f tiny > > tiny: file format elf32-powerpc > architecture: powerpc:common, flags 0x00000102: > EXEC_P, D_PAGED > start address 0x10000120 > > dmesg states: > > [ 1552.267961] tiny[2127]: unhandled signal 11 at ffff8fd0 nip > 10000180 lr 10000150 code 1 So $ gdb ./tiny (gdb) run (gdb) disas and look what line the "=>" mark is on. Segher
