forked from Minki/linux
c578455a3e
This patch removes the arch-specific fault/trap-infos from thread and
skas-regs.
It adds a new struct faultinfo, that is arch-specific defined in
sysdep/faultinfo.h.
The structure is inserted in thread.arch and thread.regs.skas and
thread.regs.tt
Now, segv and other trap-handlers can copy the contents from regs.X.faultinfo
to thread.arch.faultinfo with one simple assignment.
Also, the number of macros necessary is reduced to
FAULT_ADDRESS(struct faultinfo)
extracts the faulting address from faultinfo
FAULT_WRITE(struct faultinfo)
extracts the "is_write" flag
SEGV_IS_FIXABLE(struct faultinfo)
is true for the fixable segvs, i.e. (TRAP == 14)
on i386
UPT_FAULTINFO(regs)
result is (struct faultinfo *) to the faultinfo
in regs->skas.faultinfo
GET_FAULTINFO_FROM_SC(struct faultinfo, struct sigcontext *)
copies the relevant parts of the sigcontext to
struct faultinfo.
On SIGSEGV, call user_signal() instead of handle_segv(), if the architecture
provides the information needed in PTRACE_FAULTINFO, or if PTRACE_FAULTINFO is
missing, because segv-stub will provide the info.
The benefit of the change is, that in case of a non-fixable SIGSEGV, we can
give user processes a SIGSEGV, instead of possibly looping on pagefault
handling.
Since handle_segv() sikked arch_fixup() implicitly by passing ip==0 to segv(),
I changed segv() to call arch_fixup() only, if !is_user.
Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.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>
120 lines
2.9 KiB
C
120 lines
2.9 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <stdlib.h>
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#include <errno.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <asm/page.h>
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#include <asm/unistd.h>
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#include <asm/ptrace.h>
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#include "init.h"
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#include "sysdep/ptrace.h"
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#include "sigcontext.h"
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#include "sysdep/sigcontext.h"
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#include "irq_user.h"
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#include "signal_user.h"
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#include "time_user.h"
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#include "task.h"
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#include "mode.h"
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#include "choose-mode.h"
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#include "kern_util.h"
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#include "user_util.h"
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#include "os.h"
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void kill_child_dead(int pid)
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{
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kill(pid, SIGKILL);
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kill(pid, SIGCONT);
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do {
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int n;
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CATCH_EINTR(n = waitpid(pid, NULL, 0));
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if (n > 0)
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kill(pid, SIGCONT);
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else
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break;
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} while(1);
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}
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/* Unlocked - don't care if this is a bit off */
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int nsegfaults = 0;
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struct {
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unsigned long address;
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int is_write;
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int pid;
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unsigned long sp;
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int is_user;
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} segfault_record[1024];
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void segv_handler(int sig, union uml_pt_regs *regs)
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{
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int index, max;
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struct faultinfo * fi = UPT_FAULTINFO(regs);
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if(UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)){
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bad_segv(*fi, UPT_IP(regs));
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return;
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}
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max = sizeof(segfault_record)/sizeof(segfault_record[0]);
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index = next_trap_index(max);
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nsegfaults++;
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segfault_record[index].address = FAULT_ADDRESS(*fi);
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segfault_record[index].pid = os_getpid();
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segfault_record[index].is_write = FAULT_WRITE(*fi);
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segfault_record[index].sp = UPT_SP(regs);
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segfault_record[index].is_user = UPT_IS_USER(regs);
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segv(*fi, UPT_IP(regs), UPT_IS_USER(regs), regs);
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}
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void usr2_handler(int sig, union uml_pt_regs *regs)
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{
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CHOOSE_MODE(syscall_handler_tt(sig, regs), (void) 0);
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}
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struct signal_info sig_info[] = {
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[ SIGTRAP ] { .handler = relay_signal,
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.is_irq = 0 },
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[ SIGFPE ] { .handler = relay_signal,
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.is_irq = 0 },
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[ SIGILL ] { .handler = relay_signal,
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.is_irq = 0 },
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[ SIGWINCH ] { .handler = winch,
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.is_irq = 1 },
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[ SIGBUS ] { .handler = bus_handler,
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.is_irq = 0 },
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[ SIGSEGV] { .handler = segv_handler,
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.is_irq = 0 },
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[ SIGIO ] { .handler = sigio_handler,
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.is_irq = 1 },
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[ SIGVTALRM ] { .handler = timer_handler,
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.is_irq = 1 },
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[ SIGALRM ] { .handler = timer_handler,
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.is_irq = 1 },
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[ SIGUSR2 ] { .handler = usr2_handler,
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.is_irq = 0 },
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};
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void do_longjmp(void *b, int val)
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{
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sigjmp_buf *buf = b;
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siglongjmp(*buf, val);
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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