+++ /dev/null
-/*
- * Copyright (C) 2002- 2004 Jeff Dike (jdike@addtoit.com)
- * Licensed under the GPL
- */
-
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <errno.h>
-#include <signal.h>
-#include <setjmp.h>
-#include <sched.h>
-#include <sys/wait.h>
-#include <sys/mman.h>
-#include <sys/user.h>
-#include <sys/time.h>
-#include <asm/unistd.h>
-#include <asm/types.h>
-#include "user.h"
-#include "ptrace_user.h"
-#include "sysdep/ptrace.h"
-#include "user_util.h"
-#include "kern_util.h"
-#include "skas.h"
-#include "stub-data.h"
-#include "mm_id.h"
-#include "sysdep/sigcontext.h"
-#include "sysdep/stub.h"
-#include "os.h"
-#include "proc_mm.h"
-#include "skas_ptrace.h"
-#include "chan_user.h"
-#include "registers.h"
-#include "mem.h"
-#include "uml-config.h"
-#include "process.h"
-
-int is_skas_winch(int pid, int fd, void *data)
-{
- if(pid != os_getpgrp())
- return(0);
-
- register_winch_irq(-1, fd, -1, data);
- return(1);
-}
-
-void wait_stub_done(int pid, int sig, char * fname)
-{
- int n, status, err;
-
- do {
- if ( sig != -1 ) {
- err = ptrace(PTRACE_CONT, pid, 0, sig);
- if(err)
- panic("%s : continue failed, errno = %d\n",
- fname, errno);
- }
- sig = 0;
-
- CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
- } while((n >= 0) && WIFSTOPPED(status) &&
- ((WSTOPSIG(status) == SIGVTALRM) ||
- /* running UML inside a detached screen can cause
- * SIGWINCHes
- */
- (WSTOPSIG(status) == SIGWINCH)));
-
- if((n < 0) || !WIFSTOPPED(status) ||
- (WSTOPSIG(status) != SIGUSR1 && WSTOPSIG(status) != SIGTRAP)){
- unsigned long regs[HOST_FRAME_SIZE];
- if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
- printk("Failed to get registers from stub, "
- "errno = %d\n", errno);
- else {
- int i;
-
- printk("Stub registers -\n");
- for(i = 0; i < HOST_FRAME_SIZE; i++)
- printk("\t%d - %lx\n", i, regs[i]);
- }
- panic("%s : failed to wait for SIGUSR1/SIGTRAP, "
- "pid = %d, n = %d, errno = %d, status = 0x%x\n",
- fname, pid, n, errno, status);
- }
-}
-
-void get_skas_faultinfo(int pid, struct faultinfo * fi)
-{
- int err;
-
- if(ptrace_faultinfo){
- err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
- if(err)
- panic("get_skas_faultinfo - PTRACE_FAULTINFO failed, "
- "errno = %d\n", errno);
-
- /* Special handling for i386, which has different structs */
- if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo))
- memset((char *)fi + sizeof(struct ptrace_faultinfo), 0,
- sizeof(struct faultinfo) -
- sizeof(struct ptrace_faultinfo));
- }
- else {
- wait_stub_done(pid, SIGSEGV, "get_skas_faultinfo");
-
- /* faultinfo is prepared by the stub-segv-handler at start of
- * the stub stack page. We just have to copy it.
- */
- memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
- }
-}
-
-static void handle_segv(int pid, union uml_pt_regs * regs)
-{
- get_skas_faultinfo(pid, ®s->skas.faultinfo);
- segv(regs->skas.faultinfo, 0, 1, NULL);
-}
-
-/*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/
-static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu)
-{
- int err, status;
-
- /* Mark this as a syscall */
- UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs);
-
- if (!local_using_sysemu)
- {
- err = ptrace(PTRACE_POKEUSR, 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);
-
- CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
- if((err < 0) || !WIFSTOPPED(status) ||
- (WSTOPSIG(status) != SIGTRAP + 0x80))
- panic("handle_trap - failed to wait at end of syscall, "
- "errno = %d, status = %d\n", errno, status);
- }
-
- handle_syscall(regs);
-}
-
-extern int __syscall_stub_start;
-int stub_code_fd = -1;
-__u64 stub_code_offset;
-
-static int userspace_tramp(void *stack)
-{
- void *addr;
-
- ptrace(PTRACE_TRACEME, 0, 0, 0);
-
- init_new_thread_signals(1);
- enable_timer();
-
- if(!proc_mm){
- /* This has a pte, but it can't be mapped in with the usual
- * tlb_flush mechanism because this is part of that mechanism
- */
- addr = mmap64((void *) UML_CONFIG_STUB_CODE, page_size(),
- PROT_EXEC, MAP_FIXED | MAP_PRIVATE,
- stub_code_fd, stub_code_offset);
- if(addr == MAP_FAILED){
- printk("mapping stub code failed, errno = %d\n",
- errno);
- exit(1);
- }
-
- if(stack != NULL){
- int fd;
- __u64 offset;
-
- fd = phys_mapping(to_phys(stack), &offset);
- addr = mmap((void *) UML_CONFIG_STUB_DATA, page_size(),
- PROT_READ | PROT_WRITE,
- MAP_FIXED | MAP_SHARED, fd, offset);
- if(addr == MAP_FAILED){
- printk("mapping stub stack failed, "
- "errno = %d\n", errno);
- exit(1);
- }
- }
- }
- if(!ptrace_faultinfo){
- unsigned long v = UML_CONFIG_STUB_CODE +
- (unsigned long) stub_segv_handler -
- (unsigned long) &__syscall_stub_start;
-
- set_sigstack((void *) UML_CONFIG_STUB_DATA, page_size());
- set_handler(SIGSEGV, (void *) v, SA_ONSTACK,
- SIGIO, SIGWINCH, SIGALRM, SIGVTALRM,
- SIGUSR1, -1);
- }
-
- os_stop_process(os_getpid());
- return(0);
-}
-
-/* Each element set once, and only accessed by a single processor anyway */
-#undef NR_CPUS
-#define NR_CPUS 1
-int userspace_pid[NR_CPUS];
-
-int start_userspace(unsigned long stub_stack)
-{
- void *stack;
- unsigned long sp;
- int pid, status, n, flags;
-
- if ( stub_code_fd == -1 )
- stub_code_fd = phys_mapping(to_phys(&__syscall_stub_start),
- &stub_code_offset);
-
- 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 *);
-
- flags = CLONE_FILES | SIGCHLD;
- if(proc_mm) flags |= CLONE_VM;
- pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
- if(pid < 0)
- panic("start_userspace : clone failed, errno = %d", errno);
-
- do {
- CATCH_EINTR(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 (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, (void *)PTRACE_O_TRACESYSGOOD) < 0)
- panic("start_userspace : PTRACE_SETOPTIONS failed, errno=%d\n",
- errno);
-
- if(munmap(stack, PAGE_SIZE) < 0)
- panic("start_userspace : munmap failed, errno = %d\n", errno);
-
- return(pid);
-}
-
-void userspace(union uml_pt_regs *regs)
-{
- int err, status, op, pid = userspace_pid[0];
- int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
-
- while(1){
- restore_registers(pid, regs);
-
- /* Now we set local_using_sysemu to be used for one loop */
- local_using_sysemu = get_using_sysemu();
-
- op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
-
- err = ptrace(op, pid, 0, 0);
- if(err)
- panic("userspace - could not resume userspace process, "
- "pid=%d, ptrace operation = %d, errno = %d\n",
- op, errno);
-
- CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
- if(err < 0)
- panic("userspace - waitpid failed, errno = %d\n",
- errno);
-
- regs->skas.is_user = 1;
- save_registers(pid, regs);
- UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
-
- if(WIFSTOPPED(status)){
- switch(WSTOPSIG(status)){
- case SIGSEGV:
- if(PTRACE_FULL_FAULTINFO || !ptrace_faultinfo)
- user_signal(SIGSEGV, regs, pid);
- else handle_segv(pid, regs);
- break;
- case SIGTRAP + 0x80:
- handle_trap(pid, regs, local_using_sysemu);
- break;
- case SIGTRAP:
- relay_signal(SIGTRAP, regs);
- break;
- case SIGIO:
- case SIGVTALRM:
- case SIGILL:
- case SIGBUS:
- case SIGFPE:
- case SIGWINCH:
- user_signal(WSTOPSIG(status), regs, pid);
- break;
- default:
- printk("userspace - child stopped with signal "
- "%d\n", WSTOPSIG(status));
- }
- pid = userspace_pid[0];
- interrupt_end();
-
- /* Avoid -ERESTARTSYS handling in host */
- PT_SYSCALL_NR(regs->skas.regs) = -1;
- }
- }
-}
-#define INIT_JMP_NEW_THREAD 0
-#define INIT_JMP_REMOVE_SIGSTACK 1
-#define INIT_JMP_CALLBACK 2
-#define INIT_JMP_HALT 3
-#define INIT_JMP_REBOOT 4
-
-
-int copy_context_skas0(unsigned long new_stack, int pid)
-{
- int err;
- unsigned long regs[MAX_REG_NR];
- unsigned long current_stack = current_stub_stack();
- struct stub_data *data = (struct stub_data *) current_stack;
- struct stub_data *child_data = (struct stub_data *) new_stack;
- __u64 new_offset;
- int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset);
-
- /* prepare offset and fd of child's stack as argument for parent's
- * and child's mmap2 calls
- */
- *data = ((struct stub_data) { .offset = MMAP_OFFSET(new_offset),
- .fd = new_fd,
- .timer = ((struct itimerval)
- { { 0, 1000000 / hz() },
- { 0, 1000000 / hz() }})});
- get_safe_registers(regs);
-
- /* Set parent's instruction pointer to start of clone-stub */
- regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
- (unsigned long) stub_clone_handler -
- (unsigned long) &__syscall_stub_start;
- regs[REGS_SP_INDEX] = UML_CONFIG_STUB_DATA + PAGE_SIZE -
- sizeof(void *);
- err = ptrace_setregs(pid, regs);
- if(err < 0)
- panic("copy_context_skas0 : PTRACE_SETREGS failed, "
- "pid = %d, errno = %d\n", pid, errno);
-
- /* set a well known return code for detection of child write failure */
- child_data->err = 12345678;
-
- /* Wait, until parent has finished its work: read child's pid from
- * parent's stack, and check, if bad result.
- */
- wait_stub_done(pid, 0, "copy_context_skas0");
-
- pid = data->err;
- if(pid < 0)
- panic("copy_context_skas0 - stub-parent reports error %d\n",
- pid);
-
- /* Wait, until child has finished too: read child's result from
- * child's stack and check it.
- */
- wait_stub_done(pid, -1, "copy_context_skas0");
- if (child_data->err != UML_CONFIG_STUB_DATA)
- panic("copy_context_skas0 - stub-child reports error %d\n",
- child_data->err);
-
- if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL,
- (void *)PTRACE_O_TRACESYSGOOD) < 0)
- panic("copy_context_skas0 : PTRACE_SETOPTIONS failed, "
- "errno = %d\n", errno);
-
- return pid;
-}
-
-/*
- * This is used only, if stub pages are needed, while proc_mm is
- * availabl. Opening /proc/mm creates a new mm_context, which lacks
- * the stub-pages. Thus, we map them using /proc/mm-fd
- */
-void map_stub_pages(int fd, unsigned long code,
- unsigned long data, unsigned long stack)
-{
- struct proc_mm_op mmop;
- int n;
-
- mmop = ((struct proc_mm_op) { .op = MM_MMAP,
- .u =
- { .mmap =
- { .addr = code,
- .len = PAGE_SIZE,
- .prot = PROT_EXEC,
- .flags = MAP_FIXED | MAP_PRIVATE,
- .fd = stub_code_fd,
- .offset = stub_code_offset
- } } });
- n = os_write_file(fd, &mmop, sizeof(mmop));
- if(n != sizeof(mmop))
- panic("map_stub_pages : /proc/mm map for code failed, "
- "err = %d\n", -n);
-
- if ( stack ) {
- __u64 map_offset;
- int map_fd = phys_mapping(to_phys((void *)stack), &map_offset);
- mmop = ((struct proc_mm_op)
- { .op = MM_MMAP,
- .u =
- { .mmap =
- { .addr = data,
- .len = PAGE_SIZE,
- .prot = PROT_READ | PROT_WRITE,
- .flags = MAP_FIXED | MAP_SHARED,
- .fd = map_fd,
- .offset = map_offset
- } } });
- n = os_write_file(fd, &mmop, sizeof(mmop));
- if(n != sizeof(mmop))
- panic("map_stub_pages : /proc/mm map for data failed, "
- "err = %d\n", -n);
- }
-}
-
-void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
- void (*handler)(int))
-{
- unsigned long flags;
- sigjmp_buf switch_buf, fork_buf;
-
- *switch_buf_ptr = &switch_buf;
- *fork_buf_ptr = &fork_buf;
-
- /* Somewhat subtle - siglongjmp restores the signal mask before doing
- * the longjmp. This means that when jumping from one stack to another
- * when the target stack has interrupts enabled, an interrupt may occur
- * on the source stack. This is bad when starting up a process because
- * it's not supposed to get timer ticks until it has been scheduled.
- * So, we disable interrupts around the sigsetjmp to ensure that
- * they can't happen until we get back here where they are safe.
- */
- flags = get_signals();
- block_signals();
- if(sigsetjmp(fork_buf, 1) == 0)
- new_thread_proc(stack, handler);
-
- remove_sigstack();
-
- set_signals(flags);
-}
-
-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, INIT_JMP_REMOVE_SIGSTACK);
-}
-
-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;
-
- set_handler(SIGWINCH, (__sighandler_t) sig_handler,
- SA_ONSTACK | SA_RESTART, SIGUSR1, SIGIO, SIGALRM,
- SIGVTALRM, -1);
-
- *fork_buf_ptr = &initial_jmpbuf;
- n = sigsetjmp(initial_jmpbuf, 1);
- switch(n){
- case INIT_JMP_NEW_THREAD:
- new_thread_proc((void *) stack, new_thread_handler);
- break;
- case INIT_JMP_REMOVE_SIGSTACK:
- remove_sigstack();
- break;
- case INIT_JMP_CALLBACK:
- (*cb_proc)(cb_arg);
- siglongjmp(*cb_back, 1);
- break;
- case INIT_JMP_HALT:
- kmalloc_ok = 0;
- return(0);
- case INIT_JMP_REBOOT:
- kmalloc_ok = 0;
- return(1);
- default:
- panic("Bad sigsetjmp return in start_idle_thread - %d\n", n);
- }
- siglongjmp(**switch_buf, 1);
-}
-
-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, INIT_JMP_CALLBACK);
- unblock_signals();
-
- cb_proc = NULL;
- cb_arg = NULL;
- cb_back = NULL;
-}
-
-void halt_skas(void)
-{
- block_signals();
- siglongjmp(initial_jmpbuf, INIT_JMP_HALT);
-}
-
-void reboot_skas(void)
-{
- block_signals();
- siglongjmp(initial_jmpbuf, INIT_JMP_REBOOT);
-}
-
-void switch_mm_skas(struct mm_id *mm_idp)
-{
- int err;
-
-#warning need cpu pid in switch_mm_skas
- if(proc_mm){
- err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
- mm_idp->u.mm_fd);
- if(err)
- panic("switch_mm_skas - PTRACE_SWITCH_MM failed, "
- "errno = %d\n", errno);
- }
- else userspace_pid[0] = mm_idp->u.pid;
-}
-
-/*
- * 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:
- */
projects / openwrt / staging / blogic.git / commitdiff