bsd coredump

APP coredump:

#define    __elfN(x)    __CONCAT(__CONCAT(__CONCAT(elf,__ELF_WORD_SIZE),_),x)


__elfN(coredump) = __elf64_coredump

static Elf64_Brandinfo freebsd_brand_info = {
    .brand        = ELFOSABI_FREEBSD,
    .machine    = EM_MIPS,
    .compat_3_brand    = "FreeBSD",
    .emul_path    = NULL,
    .interp_path    = "/libexec/ld-elf.so.1",
    .sysvec        = &elf64_freebsd_sysvec,
    .interp_newpath    = NULL,
    .flags        = 0
};

struct sysentvec elf64_freebsd_sysvec = {
......
.sv_coredump    = __elfN(coredump)
......
}

static int
coredump(struct thread *td)=>(p->p_sysent->sv_coredump)

int __elfN(coredump)(struct thread *td, struct vnode *vp, off_t limit, int flags)
=>core_output=>compress_core=>

compress_core()
{
  EVENTHANDLER_INVOKE(app_coredump_progress, td, len_compressed);
}
 
Kernel coredump:

“void panic(const char *fmt, ...)” function, when go into db>, use “panic” command to trigger kernel coredump.

The coredump main function : doadump->dumpsys->cb_dumpdata->(di->dumper)