redonkable/remarkable-linux
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[PATCH] uml: move libc-dependent code from trap_user.c

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The serial UML OS-abstraction layer patch (um/kernel dir).

This moves all systemcalls from trap_user.c file under os-Linux dir

Signed-off-by: Gennady Sharapov <Gennady.V.Sharapov@intel.com>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Gennady Sharapov 2006-01-08 01:01:31 -08:00 committed by Linus Torvalds
parent 0805d89c15
commit ea2ba7dc3d
13 changed files with 123 additions and 91 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

17
arch/um/include/kern_util.h
View file

@ -1,4 +1,4 @@
/*
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
@ -10,6 +10,19 @@
#include "sysdep/ptrace.h"
#include "sysdep/faultinfo.h"
typedef void (*kern_hndl)(int, union uml_pt_regs *);
struct kern_handlers {
kern_hndl relay_signal;
kern_hndl winch;
kern_hndl bus_handler;
kern_hndl page_fault;
kern_hndl sigio_handler;
kern_hndl timer_handler;
};
extern struct kern_handlers handlinfo_kern;
extern int ncpus;
extern char *linux_prog;
extern char *gdb_init;
@ -109,6 +122,8 @@ extern void arch_switch(void);
extern void free_irq(unsigned int, void *);
extern int um_in_interrupt(void);
extern int cpu(void);
extern void segv_handler(int sig, union uml_pt_regs *regs);
extern void sigio_handler(int sig, union uml_pt_regs *regs);
#endif

6
arch/um/include/os.h
View file

@ -9,6 +9,8 @@
#include "uml-config.h"
#include "asm/types.h"
#include "../os/include/file.h"
#include "sysdep/ptrace.h"
#include "kern_util.h"
#define OS_TYPE_FILE 1
#define OS_TYPE_DIR 2
@ -229,4 +231,8 @@ extern void unblock_signals(void);
extern int get_signals(void);
extern int set_signals(int enable);
/* trap.c */
extern void os_fill_handlinfo(struct kern_handlers h);
extern void do_longjmp(void *p, int val);
#endif

10
arch/um/include/user_util.h
View file

@ -1,4 +1,4 @@
/*
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
@ -23,12 +23,7 @@ struct cpu_task {
extern struct cpu_task cpu_tasks[];
struct signal_info {
void (*handler)(int, union uml_pt_regs *);
int is_irq;
};
extern struct signal_info sig_info[];
extern void (*sig_info[])(int, union uml_pt_regs *);
extern unsigned long low_physmem;
extern unsigned long high_physmem;
@ -64,7 +59,6 @@ extern void setup_machinename(char *machine_out);
extern void setup_hostinfo(void);
extern void do_exec(int old_pid, int new_pid);
extern void tracer_panic(char *msg, ...);
extern void do_longjmp(void *p, int val);
extern int detach(int pid, int sig);
extern int attach(int pid);
extern void kill_child_dead(int pid);

2
arch/um/kernel/skas/Makefile
View file

@ -4,7 +4,7 @@
#
obj-y := clone.o exec_kern.o mem.o mem_user.o mmu.o process.o process_kern.o \
syscall.o tlb.o trap_user.o uaccess.o
syscall.o tlb.o uaccess.o
USER_OBJS := process.o clone.o

11
arch/um/kernel/trap_kern.c
View file

@ -1,4 +1,4 @@
/*
/*
* Copyright (C) 2000, 2001 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
@ -29,6 +29,7 @@
#ifdef CONFIG_MODE_SKAS
#include "skas.h"
#endif
#include "os.h"
/* Note this is constrained to return 0, -EFAULT, -EACCESS, -ENOMEM by segv(). */
int handle_page_fault(unsigned long address, unsigned long ip,
@ -125,6 +126,14 @@ out_of_memory:
goto out;
}
struct kern_handlers handlinfo_kern = {
.relay_signal = relay_signal,
.winch = winch,
.bus_handler = relay_signal,
.page_fault = segv_handler,
.sigio_handler = sigio_handler,
.timer_handler = timer_handler
};
/*
* We give a *copy* of the faultinfo in the regs to segv.
* This must be done, since nesting SEGVs could overwrite

65
arch/um/kernel/trap_user.c
View file

@ -1,4 +1,4 @@
/*
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
@ -25,20 +25,6 @@
#include "user_util.h"
#include "os.h"
void kill_child_dead(int pid)
{
kill(pid, SIGKILL);
kill(pid, SIGCONT);
do {
int n;
CATCH_EINTR(n = waitpid(pid, NULL, 0));
if (n > 0)
kill(pid, SIGCONT);
else
break;
} while(1);
}
void segv_handler(int sig, union uml_pt_regs *regs)
{
struct faultinfo * fi = UPT_FAULTINFO(regs);
@ -55,43 +41,18 @@ void usr2_handler(int sig, union uml_pt_regs *regs)
CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
}
struct signal_info sig_info[] = {
[ SIGTRAP ] { .handler = relay_signal,
.is_irq = 0 },
[ SIGFPE ] { .handler = relay_signal,
.is_irq = 0 },
[ SIGILL ] { .handler = relay_signal,
.is_irq = 0 },
[ SIGWINCH ] { .handler = winch,
.is_irq = 1 },
[ SIGBUS ] { .handler = bus_handler,
.is_irq = 0 },
[ SIGSEGV] { .handler = segv_handler,
.is_irq = 0 },
[ SIGIO ] { .handler = sigio_handler,
.is_irq = 1 },
[ SIGVTALRM ] { .handler = timer_handler,
.is_irq = 1 },
[ SIGALRM ] { .handler = timer_handler,
.is_irq = 1 },
[ SIGUSR2 ] { .handler = usr2_handler,
.is_irq = 0 },
};
void (*sig_info[NSIG])(int, union uml_pt_regs *);
void do_longjmp(void *b, int val)
void os_fill_handlinfo(struct kern_handlers h)
{
sigjmp_buf *buf = b;
siglongjmp(*buf, val);
sig_info[SIGTRAP] = h.relay_signal;
sig_info[SIGFPE] = h.relay_signal;
sig_info[SIGILL] = h.relay_signal;
sig_info[SIGWINCH] = h.winch;
sig_info[SIGBUS] = h.bus_handler;
sig_info[SIGSEGV] = h.page_fault;
sig_info[SIGIO] = h.sigio_handler;
sig_info[SIGVTALRM] = h.timer_handler;
sig_info[SIGALRM] = h.timer_handler;
sig_info[SIGUSR2] = usr2_handler;
}
/*
* 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:
*/

14
arch/um/kernel/tt/trap_user.c
View file

@ -1,4 +1,4 @@
/*
/*
* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
@ -18,8 +18,8 @@ void sig_handler_common_tt(int sig, void *sc_ptr)
{
struct sigcontext *sc = sc_ptr;
struct tt_regs save_regs, *r;
struct signal_info *info;
int save_errno = errno, is_user;
void (*handler)(int, union uml_pt_regs *);
/* This is done because to allow SIGSEGV to be delivered inside a SEGV
* handler. This can happen in copy_user, and if SEGV is disabled,
@ -40,10 +40,14 @@ void sig_handler_common_tt(int sig, void *sc_ptr)
if(sig != SIGUSR2)
r->syscall = -1;
info = &sig_info[sig];
if(!info->is_irq) unblock_signals();
handler = sig_info[sig];
(*info->handler)(sig, (union uml_pt_regs *) r);
/* unblock SIGALRM, SIGVTALRM, SIGIO if sig isn't IRQ signal */
if (sig != SIGIO && sig != SIGWINCH &&
sig != SIGVTALRM && sig != SIGALRM)
unblock_signals();
handler(sig, (union uml_pt_regs *) r);
if(is_user){
interrupt_end();

7
arch/um/kernel/um_arch.c
View file

@ -1,4 +1,4 @@
/*
/*
* Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
@ -363,6 +363,11 @@ int linux_main(int argc, char **argv)
uml_start = CHOOSE_MODE_PROC(set_task_sizes_tt, set_task_sizes_skas, 0,
&host_task_size, &task_size);
/*
* Setting up handlers to 'sig_info' struct
*/
os_fill_handlinfo(handlinfo_kern);
brk_start = (unsigned long) sbrk(0);
CHOOSE_MODE_PROC(before_mem_tt, before_mem_skas, brk_start);
/* Increase physical memory size for exec-shield users

8
arch/um/os-Linux/Makefile
View file

@ -4,11 +4,13 @@
#
obj-y = aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \
start_up.o time.o tt.o tty.o uaccess.o umid.o user_syms.o drivers/ \
sys-$(SUBARCH)/
start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o user_syms.o \
drivers/ sys-$(SUBARCH)/
obj-$(CONFIG_MODE_SKAS) += skas/
USER_OBJS := aio.o elf_aux.o file.o helper.o main.o mem.o process.o signal.o \
start_up.o time.o tt.o tty.o uaccess.o umid.o
start_up.o time.o trap.o tt.o tty.o uaccess.o umid.o
elf_aux.o: $(ARCH_DIR)/kernel-offsets.h
CFLAGS_elf_aux.o += -I$(objtree)/arch/um

10
arch/um/os-Linux/skas/Makefile Normal file
View file

@ -0,0 +1,10 @@
#
# Copyright (C) 2002 - 2004 Jeff Dike (jdike@addtoit.com)
# Licensed under the GPL
#
obj-y := trap.o
USER_OBJS := trap.o
include arch/um/scripts/Makefile.rules

33
arch/um/kernel/skas/trap_user.c → arch/um/os-Linux/skas/trap.c
View file

@ -1,4 +1,4 @@
/*
/*
* Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
* Licensed under the GPL
*/
@ -19,7 +19,7 @@ void sig_handler_common_skas(int sig, void *sc_ptr)
{
struct sigcontext *sc = sc_ptr;
struct skas_regs *r;
struct signal_info *info;
void (*handler)(int, union uml_pt_regs *);
int save_errno = errno;
int save_user;
@ -41,10 +41,15 @@ void sig_handler_common_skas(int sig, void *sc_ptr)
}
change_sig(SIGUSR1, 1);
info = &sig_info[sig];
if(!info->is_irq) unblock_signals();
(*info->handler)(sig, (union uml_pt_regs *) r);
handler = sig_info[sig];
/* unblock SIGALRM, SIGVTALRM, SIGIO if sig isn't IRQ signal */
if (sig != SIGIO && sig != SIGWINCH &&
sig != SIGVTALRM && sig != SIGALRM)
unblock_signals();
handler(sig, (union uml_pt_regs *) r);
errno = save_errno;
r->is_user = save_user;
@ -54,25 +59,15 @@ extern int ptrace_faultinfo;
void user_signal(int sig, union uml_pt_regs *regs, int pid)
{
struct signal_info *info;
void (*handler)(int, union uml_pt_regs *);
int segv = ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
(sig == SIGILL) || (sig == SIGTRAP));
if (segv)
get_skas_faultinfo(pid, &regs->skas.faultinfo);
info = &sig_info[sig];
(*info->handler)(sig, regs);
handler = sig_info[sig];
handler(sig, (union uml_pt_regs *) regs);
unblock_signals();
}
/*
* 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:
*/

17
arch/um/os-Linux/trap.c Normal file
View file

@ -0,0 +1,17 @@
/*
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
* Licensed under the GPL
*/
#include <setjmp.h>
#include <signal.h>
#include "kern_util.h"
#include "user_util.h"
#include "os.h"
void do_longjmp(void *b, int val)
{
sigjmp_buf *buf = b;
siglongjmp(*buf, val);
}

14
arch/um/os-Linux/tt.c
View file

@ -49,6 +49,20 @@ int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
return(0);
}
void kill_child_dead(int pid)
{
kill(pid, SIGKILL);
kill(pid, SIGCONT);
do {
int n;
CATCH_EINTR(n = waitpid(pid, NULL, 0));
if (n > 0)
kill(pid, SIGCONT);
else
break;
} while(1);
}
/*
*-------------------------
* only for tt mode (will be deleted in future...)