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authorGennady Sharapov <gennady.v.sharapov@intel.com>2005-09-03 15:57:47 -0700
committerLinus Torvalds <torvalds@evo.osdl.org>2005-09-05 00:06:24 -0700
commit60d339f6fe0831060600c62418b71a62ad26c281 (patch)
treea2f9527bbcfe85b3eb7c063b8af7d2f499ba4cbb /arch/um/kernel/process.c
parent09ace81c1d737bcbb2423db235ac980cac4d5de9 (diff)
[PATCH] uml: move libc-dependent startup and signal code
The serial UML OS-abstraction layer patch (um/kernel dir). This moves all systemcalls from process.c file under os-Linux dir and join process.c and process_kern.c files. Signed-off-by: Gennady Sharapov <gennady.v.sharapov@intel.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/kernel/process.c')
-rw-r--r--arch/um/kernel/process.c439
1 files changed, 0 insertions, 439 deletions
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
deleted file mode 100644
index 67acd92c532..00000000000
--- a/arch/um/kernel/process.c
+++ /dev/null
@@ -1,439 +0,0 @@
-/*
- * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
- * Licensed under the GPL
- */
-
-#include <stdio.h>
-#include <unistd.h>
-#include <signal.h>
-#include <sched.h>
-#include <errno.h>
-#include <stdarg.h>
-#include <stdlib.h>
-#include <setjmp.h>
-#include <sys/time.h>
-#include <sys/wait.h>
-#include <sys/mman.h>
-#include <asm/unistd.h>
-#include <asm/page.h>
-#include "user_util.h"
-#include "kern_util.h"
-#include "user.h"
-#include "process.h"
-#include "signal_kern.h"
-#include "signal_user.h"
-#include "sysdep/ptrace.h"
-#include "sysdep/sigcontext.h"
-#include "irq_user.h"
-#include "ptrace_user.h"
-#include "time_user.h"
-#include "init.h"
-#include "os.h"
-#include "uml-config.h"
-#include "choose-mode.h"
-#include "mode.h"
-#include "tempfile.h"
-#ifdef UML_CONFIG_MODE_SKAS
-#include "skas.h"
-#include "skas_ptrace.h"
-#include "registers.h"
-#endif
-
-void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int))
-{
- int flags = 0, pages;
-
- if(sig_stack != NULL){
- pages = (1 << UML_CONFIG_KERNEL_STACK_ORDER);
- set_sigstack(sig_stack, pages * page_size());
- flags = SA_ONSTACK;
- }
- if(usr1_handler) set_handler(SIGUSR1, usr1_handler, flags, -1);
-}
-
-void init_new_thread_signals(int altstack)
-{
- int flags = altstack ? SA_ONSTACK : 0;
-
- set_handler(SIGSEGV, (__sighandler_t) sig_handler, flags,
- SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGTRAP, (__sighandler_t) sig_handler, flags,
- SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGFPE, (__sighandler_t) sig_handler, flags,
- SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGILL, (__sighandler_t) sig_handler, flags,
- SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGBUS, (__sighandler_t) sig_handler, flags,
- SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- set_handler(SIGUSR2, (__sighandler_t) sig_handler,
- flags, SIGUSR1, SIGIO, SIGWINCH, SIGALRM, SIGVTALRM, -1);
- signal(SIGHUP, SIG_IGN);
-
- init_irq_signals(altstack);
-}
-
-struct tramp {
- int (*tramp)(void *);
- void *tramp_data;
- unsigned long temp_stack;
- int flags;
- int pid;
-};
-
-/* See above for why sigkill is here */
-
-int sigkill = SIGKILL;
-
-int outer_tramp(void *arg)
-{
- struct tramp *t;
- int sig = sigkill;
-
- t = arg;
- t->pid = clone(t->tramp, (void *) t->temp_stack + page_size()/2,
- t->flags, t->tramp_data);
- if(t->pid > 0) wait_for_stop(t->pid, SIGSTOP, PTRACE_CONT, NULL);
- kill(os_getpid(), sig);
- _exit(0);
-}
-
-int start_fork_tramp(void *thread_arg, unsigned long temp_stack,
- int clone_flags, int (*tramp)(void *))
-{
- struct tramp arg;
- unsigned long sp;
- int new_pid, status, err;
-
- /* The trampoline will run on the temporary stack */
- sp = stack_sp(temp_stack);
-
- clone_flags |= CLONE_FILES | SIGCHLD;
-
- arg.tramp = tramp;
- arg.tramp_data = thread_arg;
- arg.temp_stack = temp_stack;
- arg.flags = clone_flags;
-
- /* Start the process and wait for it to kill itself */
- new_pid = clone(outer_tramp, (void *) sp, clone_flags, &arg);
- if(new_pid < 0)
- return(new_pid);
-
- CATCH_EINTR(err = waitpid(new_pid, &status, 0));
- if(err < 0)
- panic("Waiting for outer trampoline failed - errno = %d",
- errno);
-
- if(!WIFSIGNALED(status) || (WTERMSIG(status) != SIGKILL))
- panic("outer trampoline didn't exit with SIGKILL, "
- "status = %d", status);
-
- return(arg.pid);
-}
-
-static int ptrace_child(void *arg)
-{
- int ret;
- int pid = os_getpid(), ppid = getppid();
- int sc_result;
-
- if(ptrace(PTRACE_TRACEME, 0, 0, 0) < 0){
- perror("ptrace");
- os_kill_process(pid, 0);
- }
- os_stop_process(pid);
-
- /*This syscall will be intercepted by the parent. Don't call more than
- * once, please.*/
- sc_result = os_getpid();
-
- if (sc_result == pid)
- ret = 1; /*Nothing modified by the parent, we are running
- normally.*/
- else if (sc_result == ppid)
- ret = 0; /*Expected in check_ptrace and check_sysemu when they
- succeed in modifying the stack frame*/
- else
- ret = 2; /*Serious trouble! This could be caused by a bug in
- host 2.6 SKAS3/2.6 patch before release -V6, together
- with a bug in the UML code itself.*/
- _exit(ret);
-}
-
-static int start_ptraced_child(void **stack_out)
-{
- void *stack;
- unsigned long sp;
- int pid, n, status;
-
- stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
- MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
- if(stack == MAP_FAILED)
- panic("check_ptrace : mmap failed, errno = %d", errno);
- sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
- pid = clone(ptrace_child, (void *) sp, SIGCHLD, NULL);
- if(pid < 0)
- panic("check_ptrace : clone failed, errno = %d", errno);
- CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
- if(n < 0)
- panic("check_ptrace : wait failed, errno = %d", errno);
- if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
- panic("check_ptrace : expected SIGSTOP, got status = %d",
- status);
-
- *stack_out = stack;
- return(pid);
-}
-
-/* When testing for SYSEMU support, if it is one of the broken versions, we must
- * just avoid using sysemu, not panic, but only if SYSEMU features are broken.
- * So only for SYSEMU features we test mustpanic, while normal host features
- * must work anyway!*/
-static int stop_ptraced_child(int pid, void *stack, int exitcode, int mustpanic)
-{
- int status, n, ret = 0;
-
- if(ptrace(PTRACE_CONT, pid, 0, 0) < 0)
- panic("check_ptrace : ptrace failed, errno = %d", errno);
- CATCH_EINTR(n = waitpid(pid, &status, 0));
- if(!WIFEXITED(status) || (WEXITSTATUS(status) != exitcode)) {
- int exit_with = WEXITSTATUS(status);
- if (exit_with == 2)
- printk("check_ptrace : child exited with status 2. "
- "Serious trouble happening! Try updating your "
- "host skas patch!\nDisabling SYSEMU support.");
- printk("check_ptrace : child exited with exitcode %d, while "
- "expecting %d; status 0x%x", exit_with,
- exitcode, status);
- if (mustpanic)
- panic("\n");
- else
- printk("\n");
- ret = -1;
- }
-
- if(munmap(stack, PAGE_SIZE) < 0)
- panic("check_ptrace : munmap failed, errno = %d", errno);
- return ret;
-}
-
-static int force_sysemu_disabled = 0;
-
-int ptrace_faultinfo = 1;
-int proc_mm = 1;
-
-static int __init skas0_cmd_param(char *str, int* add)
-{
- ptrace_faultinfo = proc_mm = 0;
- return 0;
-}
-
-static int __init nosysemu_cmd_param(char *str, int* add)
-{
- force_sysemu_disabled = 1;
- return 0;
-}
-
-__uml_setup("skas0", skas0_cmd_param,
- "skas0\n"
- " Disables SKAS3 usage, so that SKAS0 is used, unless you \n"
- " specify mode=tt.\n\n");
-
-__uml_setup("nosysemu", nosysemu_cmd_param,
- "nosysemu\n"
- " Turns off syscall emulation patch for ptrace (SYSEMU) on.\n"
- " SYSEMU is a performance-patch introduced by Laurent Vivier. It changes\n"
- " behaviour of ptrace() and helps reducing host context switch rate.\n"
- " To make it working, you need a kernel patch for your host, too.\n"
- " See http://perso.wanadoo.fr/laurent.vivier/UML/ for further information.\n\n");
-
-static void __init check_sysemu(void)
-{
- void *stack;
- int pid, syscall, n, status, count=0;
-
- printk("Checking syscall emulation patch for ptrace...");
- sysemu_supported = 0;
- pid = start_ptraced_child(&stack);
-
- if(ptrace(PTRACE_SYSEMU, pid, 0, 0) < 0)
- goto fail;
-
- CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
- if (n < 0)
- panic("check_sysemu : wait failed, errno = %d", errno);
- if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
- panic("check_sysemu : expected SIGTRAP, "
- "got status = %d", status);
-
- n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET,
- os_getpid());
- if(n < 0)
- panic("check_sysemu : failed to modify system "
- "call return, errno = %d", errno);
-
- if (stop_ptraced_child(pid, stack, 0, 0) < 0)
- goto fail_stopped;
-
- sysemu_supported = 1;
- printk("OK\n");
- set_using_sysemu(!force_sysemu_disabled);
-
- printk("Checking advanced syscall emulation patch for ptrace...");
- pid = start_ptraced_child(&stack);
- while(1){
- count++;
- if(ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0)
- goto fail;
- CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
- if(n < 0)
- panic("check_ptrace : wait failed, errno = %d", errno);
- if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP))
- panic("check_ptrace : expected (SIGTRAP|SYSCALL_TRAP), "
- "got status = %d", status);
-
- syscall = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET,
- 0);
- if(syscall == __NR_getpid){
- if (!count)
- panic("check_ptrace : SYSEMU_SINGLESTEP doesn't singlestep");
- n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET,
- os_getpid());
- if(n < 0)
- panic("check_sysemu : failed to modify system "
- "call return, errno = %d", errno);
- break;
- }
- }
- if (stop_ptraced_child(pid, stack, 0, 0) < 0)
- goto fail_stopped;
-
- sysemu_supported = 2;
- printk("OK\n");
-
- if ( !force_sysemu_disabled )
- set_using_sysemu(sysemu_supported);
- return;
-
-fail:
- stop_ptraced_child(pid, stack, 1, 0);
-fail_stopped:
- printk("missing\n");
-}
-
-void __init check_ptrace(void)
-{
- void *stack;
- int pid, syscall, n, status;
-
- printk("Checking that ptrace can change system call numbers...");
- pid = start_ptraced_child(&stack);
-
- if (ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
- panic("check_ptrace: PTRACE_SETOPTIONS failed, errno = %d", errno);
-
- while(1){
- if(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0)
- panic("check_ptrace : ptrace failed, errno = %d",
- errno);
- CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
- if(n < 0)
- panic("check_ptrace : wait failed, errno = %d", errno);
- if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP + 0x80))
- panic("check_ptrace : expected SIGTRAP + 0x80, "
- "got status = %d", status);
-
- syscall = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET,
- 0);
- if(syscall == __NR_getpid){
- n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
- __NR_getppid);
- if(n < 0)
- panic("check_ptrace : failed to modify system "
- "call, errno = %d", errno);
- break;
- }
- }
- stop_ptraced_child(pid, stack, 0, 1);
- printk("OK\n");
- check_sysemu();
-}
-
-int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)
-{
- sigjmp_buf buf;
- int n;
-
- *jmp_ptr = &buf;
- n = sigsetjmp(buf, 1);
- if(n != 0)
- return(n);
- (*fn)(arg);
- return(0);
-}
-
-void forward_pending_sigio(int target)
-{
- sigset_t sigs;
-
- if(sigpending(&sigs))
- panic("forward_pending_sigio : sigpending failed");
- if(sigismember(&sigs, SIGIO))
- kill(target, SIGIO);
-}
-
-extern void *__syscall_stub_start, __syscall_stub_end;
-
-#ifdef UML_CONFIG_MODE_SKAS
-
-static inline void check_skas3_ptrace_support(void)
-{
- struct ptrace_faultinfo fi;
- void *stack;
- int pid, n;
-
- printf("Checking for the skas3 patch in the host...");
- pid = start_ptraced_child(&stack);
-
- n = ptrace(PTRACE_FAULTINFO, pid, 0, &fi);
- if (n < 0) {
- ptrace_faultinfo = 0;
- if(errno == EIO)
- printf("not found\n");
- else {
- perror("not found");
- }
- }
- else {
- if (!ptrace_faultinfo)
- printf("found but disabled on command line\n");
- else
- printf("found\n");
- }
-
- init_registers(pid);
- stop_ptraced_child(pid, stack, 1, 1);
-}
-
-int can_do_skas(void)
-{
- printf("Checking for /proc/mm...");
- if (os_access("/proc/mm", OS_ACC_W_OK) < 0) {
- proc_mm = 0;
- printf("not found\n");
- } else {
- if (!proc_mm)
- printf("found but disabled on command line\n");
- else
- printf("found\n");
- }
-
- check_skas3_ptrace_support();
- return 1;
-}
-#else
-int can_do_skas(void)
-{
- return(0);
-}
-#endif