epc               134 kernel/exec.c    p->trapframe->epc = elf.entry;  // initial program counter = main
epc                47 kernel/proc.h    /*  24 */ uint64 epc;           // saved user program counter
epc                52 kernel/trap.c    p->trapframe->epc = r_sepc();
epc                62 kernel/trap.c      p->trapframe->epc += 4;
epc               130 kernel/trap.c    w_sepc(p->trapframe->epc);