mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 11:56:43 +07:00
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
/*
|
|
* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <errno.h>
|
|
#include <setjmp.h>
|
|
#include <signal.h>
|
|
#include <sys/time.h>
|
|
#include <sys/wait.h>
|
|
#include <asm/page.h>
|
|
#include <asm/unistd.h>
|
|
#include <asm/ptrace.h>
|
|
#include "init.h"
|
|
#include "sysdep/ptrace.h"
|
|
#include "sigcontext.h"
|
|
#include "sysdep/sigcontext.h"
|
|
#include "irq_user.h"
|
|
#include "signal_user.h"
|
|
#include "time_user.h"
|
|
#include "task.h"
|
|
#include "mode.h"
|
|
#include "choose-mode.h"
|
|
#include "kern_util.h"
|
|
#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);
|
|
}
|
|
|
|
/* Unlocked - don't care if this is a bit off */
|
|
int nsegfaults = 0;
|
|
|
|
struct {
|
|
unsigned long address;
|
|
int is_write;
|
|
int pid;
|
|
unsigned long sp;
|
|
int is_user;
|
|
} segfault_record[1024];
|
|
|
|
void segv_handler(int sig, union uml_pt_regs *regs)
|
|
{
|
|
int index, max;
|
|
struct faultinfo * fi = UPT_FAULTINFO(regs);
|
|
|
|
if(UPT_IS_USER(regs) && !SEGV_IS_FIXABLE(fi)){
|
|
bad_segv(*fi, UPT_IP(regs));
|
|
return;
|
|
}
|
|
max = sizeof(segfault_record)/sizeof(segfault_record[0]);
|
|
index = next_trap_index(max);
|
|
|
|
nsegfaults++;
|
|
segfault_record[index].address = FAULT_ADDRESS(*fi);
|
|
segfault_record[index].pid = os_getpid();
|
|
segfault_record[index].is_write = FAULT_WRITE(*fi);
|
|
segfault_record[index].sp = UPT_SP(regs);
|
|
segfault_record[index].is_user = UPT_IS_USER(regs);
|
|
segv(*fi, UPT_IP(regs), UPT_IS_USER(regs), regs);
|
|
}
|
|
|
|
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 do_longjmp(void *b, int val)
|
|
{
|
|
sigjmp_buf *buf = b;
|
|
|
|
siglongjmp(*buf, val);
|
|
}
|
|
|
|
/*
|
|
* 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:
|
|
*/
|