| /* |
| * Copyright (C) 2002 Jeff Dike (jdike@karaya.com) |
| * Licensed under the GPL |
| */ |
| |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <errno.h> |
| #include <signal.h> |
| #include <setjmp.h> |
| #include <sched.h> |
| #include <sys/wait.h> |
| #include <sys/ptrace.h> |
| #include <sys/mman.h> |
| #include <sys/user.h> |
| #include <asm/unistd.h> |
| #include "user.h" |
| #include "ptrace_user.h" |
| #include "time_user.h" |
| #include "sysdep/ptrace.h" |
| #include "user_util.h" |
| #include "kern_util.h" |
| #include "skas.h" |
| #include "sysdep/sigcontext.h" |
| #include "os.h" |
| #include "proc_mm.h" |
| #include "skas_ptrace.h" |
| #include "chan_user.h" |
| |
| int is_skas_winch(int pid, int fd, void *data) |
| { |
| if(pid != getpid()) |
| return(0); |
| |
| register_winch_irq(-1, fd, -1, data); |
| return(1); |
| } |
| |
| /* These are set once at boot time and not changed thereafter */ |
| |
| unsigned long exec_regs[FRAME_SIZE]; |
| unsigned long exec_fp_regs[HOST_FP_SIZE]; |
| unsigned long exec_fpx_regs[HOST_XFP_SIZE]; |
| int have_fpx_regs = 1; |
| |
| static void handle_segv(int pid) |
| { |
| struct ptrace_faultinfo fault; |
| int err; |
| |
| err = ptrace(PTRACE_FAULTINFO, pid, 0, &fault); |
| if(err) |
| panic("handle_segv - PTRACE_FAULTINFO failed, errno = %d\n", |
| errno); |
| |
| segv(fault.addr, 0, FAULT_WRITE(fault.is_write), 1, NULL); |
| } |
| |
| static void handle_trap(int pid, union uml_pt_regs *regs) |
| { |
| int err, syscall_nr, status; |
| |
| syscall_nr = PT_SYSCALL_NR(regs->skas.regs); |
| UPT_SYSCALL_NR(regs) = syscall_nr; |
| if(syscall_nr < 1){ |
| relay_signal(SIGTRAP, regs); |
| return; |
| } |
| |
| err = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET, __NR_getpid); |
| if(err < 0) |
| panic("handle_trap - nullifying syscall failed errno = %d\n", |
| errno); |
| |
| err = ptrace(PTRACE_SYSCALL, pid, 0, 0); |
| if(err < 0) |
| panic("handle_trap - continuing to end of syscall failed, " |
| "errno = %d\n", errno); |
| |
| err = waitpid(pid, &status, WUNTRACED); |
| if((err < 0) || !WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP)) |
| panic("handle_trap - failed to wait at end of syscall, " |
| "errno = %d, status = %d\n", errno, status); |
| |
| handle_syscall(regs); |
| } |
| |
| static int userspace_tramp(void *arg) |
| { |
| init_new_thread_signals(0); |
| enable_timer(); |
| ptrace(PTRACE_TRACEME, 0, 0, 0); |
| os_stop_process(os_getpid()); |
| return(0); |
| } |
| |
| /* Each element set once, and only accessed by a single processor anyway */ |
| #define NR_CPUS 1 |
| int userspace_pid[NR_CPUS]; |
| |
| void start_userspace(int cpu) |
| { |
| void *stack; |
| unsigned long sp; |
| int pid, status, n; |
| |
| stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC, |
| MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| if(stack == MAP_FAILED) |
| panic("start_userspace : mmap failed, errno = %d", errno); |
| sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *); |
| |
| pid = clone(userspace_tramp, (void *) sp, |
| CLONE_FILES | CLONE_VM | SIGCHLD, NULL); |
| if(pid < 0) |
| panic("start_userspace : clone failed, errno = %d", errno); |
| |
| do { |
| n = waitpid(pid, &status, WUNTRACED); |
| if(n < 0) |
| panic("start_userspace : wait failed, errno = %d", |
| errno); |
| } while(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM)); |
| |
| if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)) |
| panic("start_userspace : expected SIGSTOP, got status = %d", |
| status); |
| |
| if(munmap(stack, PAGE_SIZE) < 0) |
| panic("start_userspace : munmap failed, errno = %d\n", errno); |
| |
| userspace_pid[cpu] = pid; |
| } |
| |
| void userspace(union uml_pt_regs *regs) |
| { |
| int err, status, op, pid = userspace_pid[0]; |
| |
| restore_registers(regs); |
| |
| err = ptrace(PTRACE_SYSCALL, pid, 0, 0); |
| if(err) |
| panic("userspace - PTRACE_SYSCALL failed, errno = %d\n", |
| errno); |
| while(1){ |
| err = waitpid(pid, &status, WUNTRACED); |
| if(err < 0) |
| panic("userspace - waitpid failed, errno = %d\n", |
| errno); |
| |
| regs->skas.is_user = 1; |
| save_registers(regs); |
| |
| if(WIFSTOPPED(status)){ |
| switch(WSTOPSIG(status)){ |
| case SIGSEGV: |
| handle_segv(pid); |
| break; |
| case SIGTRAP: |
| handle_trap(pid, regs); |
| break; |
| case SIGIO: |
| case SIGVTALRM: |
| case SIGILL: |
| case SIGBUS: |
| case SIGFPE: |
| case SIGWINCH: |
| user_signal(WSTOPSIG(status), regs); |
| break; |
| default: |
| printk("userspace - child stopped with signal " |
| "%d\n", WSTOPSIG(status)); |
| } |
| interrupt_end(); |
| } |
| |
| restore_registers(regs); |
| |
| op = singlestepping_skas() ? PTRACE_SINGLESTEP : |
| PTRACE_SYSCALL; |
| err = ptrace(op, pid, 0, 0); |
| if(err) |
| panic("userspace - PTRACE_SYSCALL failed, " |
| "errno = %d\n", errno); |
| } |
| } |
| |
| void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr, |
| void (*handler)(int)) |
| { |
| sigjmp_buf switch_buf, fork_buf; |
| |
| *switch_buf_ptr = &switch_buf; |
| *fork_buf_ptr = &fork_buf; |
| |
| if(sigsetjmp(fork_buf, 1) == 0) |
| new_thread_proc(stack, handler); |
| |
| remove_sigstack(); |
| } |
| |
| void thread_wait(void *sw, void *fb) |
| { |
| sigjmp_buf buf, **switch_buf = sw, *fork_buf; |
| |
| *switch_buf = &buf; |
| fork_buf = fb; |
| if(sigsetjmp(buf, 1) == 0) |
| siglongjmp(*fork_buf, 1); |
| } |
| |
| static int move_registers(int pid, int int_op, int fp_op, |
| union uml_pt_regs *regs, unsigned long *fp_regs) |
| { |
| if(ptrace(int_op, pid, 0, regs->skas.regs) < 0) |
| return(-errno); |
| if(ptrace(fp_op, pid, 0, fp_regs) < 0) |
| return(-errno); |
| return(0); |
| } |
| |
| void save_registers(union uml_pt_regs *regs) |
| { |
| unsigned long *fp_regs; |
| int err, fp_op; |
| |
| if(have_fpx_regs){ |
| fp_op = PTRACE_GETFPXREGS; |
| fp_regs = regs->skas.xfp; |
| } |
| else { |
| fp_op = PTRACE_GETFPREGS; |
| fp_regs = regs->skas.fp; |
| } |
| |
| err = move_registers(userspace_pid[0], PTRACE_GETREGS, fp_op, regs, |
| fp_regs); |
| if(err) |
| panic("save_registers - saving registers failed, errno = %d\n", |
| -err); |
| } |
| |
| void restore_registers(union uml_pt_regs *regs) |
| { |
| unsigned long *fp_regs; |
| int err, fp_op; |
| |
| if(have_fpx_regs){ |
| fp_op = PTRACE_SETFPXREGS; |
| fp_regs = regs->skas.xfp; |
| } |
| else { |
| fp_op = PTRACE_SETFPREGS; |
| fp_regs = regs->skas.fp; |
| } |
| |
| err = move_registers(userspace_pid[0], PTRACE_SETREGS, fp_op, regs, |
| fp_regs); |
| if(err) |
| panic("restore_registers - saving registers failed, " |
| "errno = %d\n", -err); |
| } |
| |
| void switch_threads(void *me, void *next) |
| { |
| sigjmp_buf my_buf, **me_ptr = me, *next_buf = next; |
| |
| *me_ptr = &my_buf; |
| if(sigsetjmp(my_buf, 1) == 0) |
| siglongjmp(*next_buf, 1); |
| } |
| |
| static sigjmp_buf initial_jmpbuf; |
| |
| /* XXX Make these percpu */ |
| static void (*cb_proc)(void *arg); |
| static void *cb_arg; |
| static sigjmp_buf *cb_back; |
| |
| int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr) |
| { |
| sigjmp_buf **switch_buf = switch_buf_ptr; |
| int n; |
| |
| *fork_buf_ptr = &initial_jmpbuf; |
| n = sigsetjmp(initial_jmpbuf, 1); |
| if(n == 0) |
| new_thread_proc((void *) stack, new_thread_handler); |
| else if(n == 1) |
| remove_sigstack(); |
| else if(n == 2){ |
| (*cb_proc)(cb_arg); |
| siglongjmp(*cb_back, 1); |
| } |
| else if(n == 3){ |
| kmalloc_ok = 0; |
| return(0); |
| } |
| else if(n == 4){ |
| kmalloc_ok = 0; |
| return(1); |
| } |
| siglongjmp(**switch_buf, 1); |
| } |
| |
| void remove_sigstack(void) |
| { |
| stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE, |
| .ss_sp = NULL, |
| .ss_size = 0 }); |
| |
| if(sigaltstack(&stack, NULL) != 0) |
| panic("disabling signal stack failed, errno = %d\n", errno); |
| } |
| |
| void initial_thread_cb_skas(void (*proc)(void *), void *arg) |
| { |
| sigjmp_buf here; |
| |
| cb_proc = proc; |
| cb_arg = arg; |
| cb_back = &here; |
| |
| block_signals(); |
| if(sigsetjmp(here, 1) == 0) |
| siglongjmp(initial_jmpbuf, 2); |
| unblock_signals(); |
| |
| cb_proc = NULL; |
| cb_arg = NULL; |
| cb_back = NULL; |
| } |
| |
| void halt_skas(void) |
| { |
| block_signals(); |
| siglongjmp(initial_jmpbuf, 3); |
| } |
| |
| void reboot_skas(void) |
| { |
| block_signals(); |
| siglongjmp(initial_jmpbuf, 4); |
| } |
| |
| int new_mm(int from) |
| { |
| struct proc_mm_op copy; |
| int n, fd = os_open_file("/proc/mm", |
| of_cloexec(of_write(OPENFLAGS())), 0); |
| |
| if(fd < 0) |
| return(fd); |
| |
| if(from != -1){ |
| copy = ((struct proc_mm_op) { .op = MM_COPY_SEGMENTS, |
| .u = |
| { .copy_segments = from } } ); |
| n = os_write_file(fd, ©, sizeof(copy)); |
| if(n != sizeof(copy)) |
| printk("new_mm : /proc/mm copy_segments failed, " |
| "err = %d\n", -n); |
| } |
| |
| return(fd); |
| } |
| |
| void switch_mm_skas(int mm_fd) |
| { |
| int err; |
| |
| #warning need cpu pid in switch_mm_skas |
| err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0, mm_fd); |
| if(err) |
| panic("switch_mm_skas - PTRACE_SWITCH_MM failed, errno = %d\n", |
| errno); |
| } |
| |
| void kill_off_processes_skas(void) |
| { |
| #warning need to loop over userspace_pids in kill_off_processes_skas |
| os_kill_process(userspace_pid[0], 1); |
| } |
| |
| void init_registers(int pid) |
| { |
| int err; |
| |
| if(ptrace(PTRACE_GETREGS, pid, 0, exec_regs) < 0) |
| panic("check_ptrace : PTRACE_GETREGS failed, errno = %d", |
| errno); |
| |
| err = ptrace(PTRACE_GETFPXREGS, pid, 0, exec_fpx_regs); |
| if(!err) |
| return; |
| |
| have_fpx_regs = 0; |
| if(errno != EIO) |
| panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d", |
| errno); |
| |
| err = ptrace(PTRACE_GETFPREGS, pid, 0, exec_fp_regs); |
| if(err) |
| panic("check_ptrace : PTRACE_GETFPREGS failed, errno = %d", |
| errno); |
| } |
| |
| /* |
| * Overrides for Emacs so that we follow Linus's tabbing style. |
| * Emacs will notice this stuff at the end of the file and automatically |
| * adjust the settings for this buffer only. This must remain at the end |
| * of the file. |
| * --------------------------------------------------------------------------- |
| * Local variables: |
| * c-file-style: "linux" |
| * End: |
| */ |