Hi Jean-Michel, On 3/6/24 20:54, Jean-Michel Hautbois wrote:
Hi there ! I managed to get really far in my boot process, as I can now try to execute bash. I had to change the elf.h file because if I don't do that, it is not working. Here is the diff (on v6.9.1): diff --git a/arch/m68k/include/asm/elf.h b/arch/m68k/include/asm/elf.h index 2def06a99b08..38acb928fa81 100644 --- a/arch/m68k/include/asm/elf.h +++ b/arch/m68k/include/asm/elf.h @@ -78,8 +78,10 @@ typedef struct user_m68kfp_struct elf_fpregset_t; the loader. We need to make sure that it is out of the way of the program that it will "exec", and that there is sufficient room for the brk. */ -#ifndef CONFIG_SUN3 +#if !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE) #define ELF_ET_DYN_BASE 0xD0000000UL +#elif defined(CONFIG_COLDFIRE) +#define ELF_ET_DYN_BASE (TASK_UNMAPPED_BASE + 0x10000000)
Thats interesting. How did you determine this value to use?
#else #define ELF_ET_DYN_BASE 0x0D800000UL #endif Without the patch: [ 3.020000] Freeing unused kernel image (initmem) memory: 96K [ 3.030000] This architecture does not have kernel memory protection. [ 3.030000] Run /bin/bash as init process [ 3.320000] Kernel panic - not syncing: Requested init /bin/bash failed (error -12). [ 3.320000] CPU: 0 PID: 1 Comm: bash Not tainted 6.9.2stmark2-001-00013-gcf0217bae3ae #285 [ 3.320000] Stack from 41845f70: [ 3.320000] 41845f70 413bccd1 413bccd1 00000001 413f2700 41008a68 413151f2 413bccd1 [ 3.320000] 4130e630 41845fb0 413f2700 00000003 00000001 4130eeda 00000000 00000000 [ 3.320000] 41315a2e 413b303d 4febbf1e fffffff4 4131598e 410033f4 00000000 00000000 [ 3.320000] 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 3.320000] 00000000 00000000 00002000 00000000 [ 3.320000] Call Trace: arch_local_irq_disable (./arch/m68k/include/asm/irqflags.h:20) [ 3.320000] dump_stack (lib/dump_stack.c:124) [ 3.320000] panic (kernel/panic.c:267 kernel/panic.c:369) [ 3.320000] _printk (kernel/printk/printk.c:2368) [ 3.320000] kernel_init (init/main.c:1500) [ 3.320000] kernel_init (init/main.c:1436) [ 3.320000] ret_from_kernel_thread (arch/m68k/kernel/entry.S:142) [ 3.320000] [ 3.320000] ---[ end Kernel panic - not syncing: Requested init /bin/bash failed (error -12). ]--- With the patch, the /bin/bash file is executed, but then any command will fail with a segfault: [ 3.000000] Freeing unused kernel image (initmem) memory: 96K [ 3.010000] This architecture does not have kernel memory protection. [ 3.020000] Run /bin/bash as init process bash: cannot set terminal process group (-1): Inappropriate ioctl for device bash: no job control in this shell bash-5.2# ls bin home linuxrc opt run tmp dev lib media 7.250000] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 7.250000] Oops: 00000000 [ 7.250000] PC: 0x0 [ 7.250000] SR: 2000 SP: (ptrval) a2: 41c58000 [ 7.250000] d0: 00000028 d1: 00000003 d2: 6017a000 d3: 414d9419 [ 7.250000] d4: 41b5c800 d5: 4fed3730 a0: 00000000 a1: 413227a0 [ 7.250000] Process ls (pid: 27, task=(ptrval)) [ 7.250000] Frame format=4 eff addr=41055826 pc=420516cc [ 7.250000] Stack from 41b85dfc: [ 7.250000] 4fed3730 41b85f1e 4106e3ac 4fed3730 00000000 ffffffff fffffffe 41b85ea2 [ 7.250000] 6017e000 00000001 412fbafc 4106dfe4 412fbafc 4fed3730 00000001 41b85ea2 [ 7.250000] 41b90600 6017e000 41b90600 41b6c340 6017dfff 41b84000 41b6c36c 00000000 [ 7.250000] 00000000 00000000 00000000 41b85f60 4106e5ea 41b85f1e 41b5c800 6017a000 [ 7.250000] 6017e000 41b85ea2 41b6c36c 41b85efa 41b85f1e 4102a3e8 41b6c344 41b5c4c0 [ 7.250000] 41b6c340 41b50000 00000100 00000003 41073130 41b85f1e 41b85efa 41b5c4c0 [ 7.250000] Call Trace: unmap_page_range (mm/memory.c:1482 mm/memory.c:1563 mm/memory.c:1605 mm/memory.c:1722 mm/memory.c:1751 mm/memory.c:1772 mm/memory.c:1793) [ 7.250000] mas_find (lib/maple_tree.c:6061) [ 7.250000] unmap_page_range (mm/memory.c:1782) [ 7.250000] mas_find (lib/maple_tree.c:6061) [ 7.250000] unmap_vmas (mm/memory.c:1839 mm/memory.c:1883) [ 7.250000] up_read (kernel/locking/rwsem.c:1620) [ 7.250000] exit_mmap (./include/linux/mmap_lock.h:173 mm/mmap.c:3268) [ 7.250000] arch_local_irq_enable (./arch/m68k/include/asm/irqflags.h:35) [ 7.250000] arch_local_irq_disable (./arch/m68k/include/asm/irqflags.h:20) [ 7.250000] __mmput (kernel/fork.c:1348) [ 7.250000] do_exit (./arch/m68k/include/asm/thread_info.h:46 kernel/exit.c:570 kernel/exit.c:865) [ 7.250000] sys_exit_group (kernel/exit.c:1038 kernel/exit.c:1036) [ 7.250000] do_group_exit (kernel/exit.c:1008) [ 7.250000] pid_child_should_wake (kernel/exit.c:1503) [ 7.250000] system_call (arch/m68k/coldfire/entry.S:80) [ 7.250000] [ 7.250000] Code: ffff ffff ffff ffff ffff ffff ffff ffff Bad PC value. m68k-buildroot-linux-gnu-objdump: '/tmp/tmp.vO4KvxtnKV.o': No such file Code starting with the faulting instruction =========================================== [ 7.250000] Disabling lock debugging due to kernel taint [ 7.250000] note: ls[27] exited with irqs disabled Is there a compiler to use ? I built one with buildroot, but maybe is there a gcc version somewhere to use for the Coldfire 54418 ? Could it be related ?
I would expect you could use any modern version of gcc targeted for m68k-linux. For the past few years to generate code for 5475 based platform I use a gcc-8.3.0 toolchain. I have never had any of the 5441x based devices, so I couldn't say for sure on that. Regards Greg
