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[PATCH] uml: move libc-dependent startup and signal code

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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>
This commit is contained in:
Gennady Sharapov 2005-09-03 15:57:47 -07:00 committed by Linus Torvalds
parent 09ace81c1d
commit 60d339f6fe
8 changed files with 230 additions and 168 deletions
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15
arch/um/include/os.h
View file

@ -153,6 +153,11 @@ extern int os_file_type(char *file);
extern int os_file_mode(char *file, struct openflags *mode_out);
extern int os_lock_file(int fd, int excl);
/* start_up.c */
extern void os_early_checks(void);
extern int can_do_skas(void);
/* process.c */
extern unsigned long os_process_pc(int pid);
extern int os_process_parent(int pid);
extern void os_stop_process(int pid);
@ -161,6 +166,9 @@ extern void os_kill_ptraced_process(int pid, int reap_child);
extern void os_usr1_process(int pid);
extern int os_getpid(void);
extern int os_getpgrp(void);
extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
extern void init_new_thread_signals(int altstack);
extern int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr);
extern int os_map_memory(void *virt, int fd, unsigned long long off,
unsigned long len, int r, int w, int x);
@ -170,6 +178,13 @@ extern int os_unmap_memory(void *addr, int len);
extern void os_flush_stdout(void);
extern unsigned long long os_usecs(void);
/* tt.c
* for tt mode only (will be deleted in future...)
*/
extern void forward_pending_sigio(int target);
extern int start_fork_tramp(void *arg, unsigned long temp_stack,
int clone_flags, int (*tramp)(void *));
#endif
/*

8
arch/um/include/user_util.h
View file

@ -54,8 +54,6 @@ extern void stack_protections(unsigned long address);
extern void task_protections(unsigned long address);
extern int wait_for_stop(int pid, int sig, int cont_type, void *relay);
extern void *add_signal_handler(int sig, void (*handler)(int));
extern int start_fork_tramp(void *arg, unsigned long temp_stack,
int clone_flags, int (*tramp)(void *));
extern int linux_main(int argc, char **argv);
extern void set_cmdline(char *cmd);
extern void input_cb(void (*proc)(void *), void *arg, int arg_len);
@ -64,8 +62,6 @@ extern void *um_kmalloc(int size);
extern int switcheroo(int fd, int prot, void *from, void *to, int size);
extern void setup_machinename(char *machine_out);
extern void setup_hostinfo(void);
extern void init_new_thread_stack(void *sig_stack, void (*usr1_handler)(int));
extern void init_new_thread_signals(int altstack);
extern void do_exec(int old_pid, int new_pid);
extern void tracer_panic(char *msg, ...);
extern char *get_umid(int only_if_set);
@ -74,16 +70,12 @@ extern int detach(int pid, int sig);
extern int attach(int pid);
extern void kill_child_dead(int pid);
extern int cont(int pid);
extern void check_ptrace(void);
extern void check_sigio(void);
extern int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr);
extern void write_sigio_workaround(void);
extern void arch_check_bugs(void);
extern int cpu_feature(char *what, char *buf, int len);
extern int arch_handle_signal(int sig, union uml_pt_regs *regs);
extern int arch_fixup(unsigned long address, void *sc_ptr);
extern void forward_pending_sigio(int target);
extern int can_do_skas(void);
extern void arch_init_thread(void);
extern int setjmp_wrapper(void (*proc)(void *, void *), ...);
extern int raw(int fd);

13
arch/um/kernel/Makefile
View file

@ -8,11 +8,10 @@ clean-files :=
obj-y = config.o exec_kern.o exitcode.o \
helper.o init_task.o irq.o irq_user.o ksyms.o main.o mem.o mem_user.o \
physmem.o process.o process_kern.o ptrace.o reboot.o resource.o \
sigio_user.o sigio_kern.o signal_kern.o signal_user.o smp.o \
syscall_kern.o sysrq.o tempfile.o time.o time_kern.o \
tlb.o trap_kern.o trap_user.o uaccess_user.o um_arch.o umid.o \
user_util.o
physmem.o process_kern.o ptrace.o reboot.o resource.o sigio_user.o \
sigio_kern.o signal_kern.o signal_user.o smp.o syscall_kern.o sysrq.o \
tempfile.o time.o time_kern.o tlb.o trap_kern.o trap_user.o \
uaccess_user.o um_arch.o umid.o user_util.o
obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
obj-$(CONFIG_GPROF) += gprof_syms.o
@ -25,8 +24,8 @@ obj-$(CONFIG_MODE_SKAS) += skas/
user-objs-$(CONFIG_TTY_LOG) += tty_log.o
USER_OBJS := $(user-objs-y) config.o helper.o main.o process.o tempfile.o \
time.o tty_log.o umid.o user_util.o
USER_OBJS := $(user-objs-y) config.o helper.o main.o tempfile.o time.o \
tty_log.o umid.o user_util.o
include arch/um/scripts/Makefile.rules

2
arch/um/kernel/um_arch.c
View file

@ -333,6 +333,7 @@ int linux_main(int argc, char **argv)
if(have_root == 0)
add_arg(DEFAULT_COMMAND_LINE);
os_early_checks();
mode_tt = force_tt ? 1 : !can_do_skas();
#ifndef CONFIG_MODE_TT
if (mode_tt) {
@ -470,7 +471,6 @@ void __init setup_arch(char **cmdline_p)
void __init check_bugs(void)
{
arch_check_bugs();
check_ptrace();
check_sigio();
check_devanon();
}

7
arch/um/os-Linux/Makefile
View file

@ -3,10 +3,11 @@
# Licensed under the GPL
#
obj-y = aio.o elf_aux.o file.o process.o signal.o time.o tty.o user_syms.o \
drivers/ sys-$(SUBARCH)/
obj-y = aio.o elf_aux.o file.o process.o signal.o start_up.o time.o tt.o \
tty.o user_syms.o drivers/ sys-$(SUBARCH)/
USER_OBJS := aio.o elf_aux.o file.o process.o signal.o time.o tty.o
USER_OBJS := aio.o elf_aux.o file.o process.o signal.o start_up.o time.o tt.o \
tty.o
CFLAGS_user_syms.o += -DSUBARCH_$(SUBARCH)

58
arch/um/os-Linux/process.c
View file

@ -3,10 +3,10 @@
* Licensed under the GPL
*/
#include <unistd.h>
#include <stdio.h>
#include <errno.h>
#include <signal.h>
#include <setjmp.h>
#include <linux/unistd.h>
#include <sys/mman.h>
#include <sys/wait.h>
@ -14,6 +14,10 @@
#include "os.h"
#include "user.h"
#include "user_util.h"
#include "signal_user.h"
#include "process.h"
#include "irq_user.h"
#include "kern_util.h"
#define ARBITRARY_ADDR -1
#define FAILURE_PID -1
@ -114,8 +118,10 @@ void os_usr1_process(int pid)
kill(pid, SIGUSR1);
}
/*Don't use the glibc version, which caches the result in TLS. It misses some
* syscalls, and also breaks with clone(), which does not unshare the TLS.*/
/* Don't use the glibc version, which caches the result in TLS. It misses some
* syscalls, and also breaks with clone(), which does not unshare the TLS.
*/
inline _syscall0(pid_t, getpid)
int os_getpid(void)
@ -164,6 +170,52 @@ int os_unmap_memory(void *addr, int len)
return(0);
}
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);
}
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);
}
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically

182
arch/um/kernel/process.c → arch/um/os-Linux/start_up.c
View file

@ -1,4 +1,4 @@
/*
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
@ -19,7 +19,6 @@
#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"
@ -39,98 +38,6 @@
#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;
@ -165,7 +72,7 @@ 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)
@ -173,10 +80,10 @@ static int start_ptraced_child(void **stack_out)
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);
panic("start_ptraced_child : clone failed, errno = %d", errno);
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
if(n < 0)
panic("check_ptrace : wait failed, errno = %d", errno);
panic("check_ptrace : clone failed, errno = %d", errno);
if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
panic("check_ptrace : expected SIGSTOP, got status = %d",
status);
@ -185,11 +92,14 @@ static int start_ptraced_child(void **stack_out)
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.
/* 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)
* must work anyway!
*/
static int stop_ptraced_child(int pid, void *stack, int exitcode,
int mustpanic)
{
int status, n, ret = 0;
@ -217,8 +127,6 @@ static int stop_ptraced_child(int pid, void *stack, int exitcode, int mustpanic)
return ret;
}
static int force_sysemu_disabled = 0;
int ptrace_faultinfo = 1;
int proc_mm = 1;
@ -228,24 +136,27 @@ static int __init skas0_cmd_param(char *str, int* add)
return 0;
}
__uml_setup("skas0", skas0_cmd_param,
"skas0\n"
" Disables SKAS3 usage, so that SKAS0 is used, unless \n"
" you specify mode=tt.\n\n");
static int force_sysemu_disabled = 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");
"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 \n"
" information.\n\n");
static void __init check_sysemu(void)
{
@ -321,7 +232,7 @@ static void __init check_sysemu(void)
printk("missing\n");
}
void __init check_ptrace(void)
static void __init check_ptrace(void)
{
void *stack;
int pid, syscall, n, status;
@ -329,12 +240,12 @@ void __init check_ptrace(void)
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);
if(ptrace(PTRACE_OLDSETOPTIONS, pid, 0, (void *)PTRACE_O_TRACESYSGOOD) < 0)
panic("check_ptrace: PTRACE_OLDSETOPTIONS failed, errno = %d", errno);
while(1){
if(ptrace(PTRACE_SYSCALL, pid, 0, 0) < 0)
panic("check_ptrace : ptrace failed, errno = %d",
panic("check_ptrace : ptrace failed, errno = %d",
errno);
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
if(n < 0)
@ -342,7 +253,7 @@ void __init check_ptrace(void)
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){
@ -359,33 +270,12 @@ void __init check_ptrace(void)
check_sysemu();
}
int run_kernel_thread(int (*fn)(void *), void *arg, void **jmp_ptr)
void os_early_checks(void)
{
sigjmp_buf buf;
int n;
*jmp_ptr = &buf;
n = sigsetjmp(buf, 1);
if(n != 0)
return(n);
(*fn)(arg);
return(0);
check_ptrace();
}
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;
@ -400,9 +290,8 @@ static inline void check_skas3_ptrace_support(void)
ptrace_faultinfo = 0;
if(errno == EIO)
printf("not found\n");
else {
else
perror("not found");
}
}
else {
if (!ptrace_faultinfo)
@ -419,9 +308,10 @@ int can_do_skas(void)
{
printf("Checking for /proc/mm...");
if (os_access("/proc/mm", OS_ACC_W_OK) < 0) {
proc_mm = 0;
proc_mm = 0;
printf("not found\n");
} else {
}
else {
if (!proc_mm)
printf("found but disabled on command line\n");
else

113
arch/um/os-Linux/tt.c Normal file
View file

@ -0,0 +1,113 @@
/*
* 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/ptrace.h>
#include <linux/ptrace.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <asm/ptrace.h>
#include <asm/unistd.h>
#include <asm/page.h>
#include "user_util.h"
#include "kern_util.h"
#include "user.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"
/*
*-------------------------
* only for tt mode (will be deleted in future...)
*-------------------------
*/
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);
}
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);
}