mipsn32 core files had e_flags 0, so gdb took them for o32, found no general-purpose registers and failed with an internal error in frame_unwind_find_by_frame.
Linux sets e_flags to EF_MIPS_ABI2 for n32 cores (user_mipsn32_view in arch/mips/kernel/ptrace.c). --- linux-user/mips64/target_elf.h | 2 ++ 1 file changed, 2 insertions(+) diff --git ./linux-user/mips64/target_elf.h ./linux-user/mips64/target_elf.h index efb5d97563..fd9fb89269 100644 --- ./linux-user/mips64/target_elf.h +++ ./linux-user/mips64/target_elf.h @@ -16,6 +16,8 @@ #ifdef TARGET_ABI_MIPSN32 #define elf_check_abi(x) ((x) & EF_MIPS_ABI2) +/* See linux kernel: arch/mips/kernel/ptrace.c, user_mipsn32_view. */ +#define elf_core_eflags(info) EF_MIPS_ABI2 #else #define elf_check_abi(x) (!((x) & EF_MIPS_ABI2)) #endif -- 2.54.0
