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Code Issues Releases Activity

Add a funny sysctl: debug.kdb.trap_code .

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It is similar to debug.kdb.trap, except for it tries to cause a page fault
via a call to an invalid pointer.  This can highlight differences between
a fault on data access vs. a fault on code call some CPUs might have.

This appeared as a test for a work \
Sponsored by: RiNet (Cronyx Plus LLC)
This commit is contained in:
Yaroslav Tykhiy 2006-06-18 12:27:59 +00:00
parent 8411d000a1
commit 42ccd54fec
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=159726
1 changed files with 22 additions and 1 deletions
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23
sys/kern/subr_kdb.c
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@ -62,6 +62,7 @@ static int kdb_sysctl_current(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_enter(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_panic(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_trap(SYSCTL_HANDLER_ARGS);
static int kdb_sysctl_trap_code(SYSCTL_HANDLER_ARGS);
SYSCTL_NODE(_debug, OID_AUTO, kdb, CTLFLAG_RW, NULL, "KDB nodes");
@ -78,7 +79,10 @@ SYSCTL_PROC(_debug_kdb, OID_AUTO, panic, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
kdb_sysctl_panic, "I", "set to panic the kernel");
SYSCTL_PROC(_debug_kdb, OID_AUTO, trap, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
kdb_sysctl_trap, "I", "set cause a page fault");
kdb_sysctl_trap, "I", "set to cause a page fault via data access");
SYSCTL_PROC(_debug_kdb, OID_AUTO, trap_code, CTLTYPE_INT | CTLFLAG_RW, 0, 0,
kdb_sysctl_trap_code, "I", "set to cause a page fault via code access");
/*
* Flag indicating whether or not to IPI the other CPUs to stop them on
@ -195,6 +199,23 @@ kdb_sysctl_trap(SYSCTL_HANDLER_ARGS)
return (*addr);
}
static int
kdb_sysctl_trap_code(SYSCTL_HANDLER_ARGS)
{
int error, i;
void (*fp)(u_int, u_int, u_int) = (void *)0xdeadc0de;
error = sysctl_wire_old_buffer(req, sizeof(int));
if (error == 0) {
i = 0;
error = sysctl_handle_int(oidp, &i, 0, req);
}
if (error != 0 || req->newptr == NULL)
return (error);
(*fp)(0x11111111, 0x22222222, 0x33333333);
return (0);
}
/*
* Solaris implements a new BREAK which is initiated by a character sequence
* CR ~ ^b which is similar to a familiar pattern used on Sun servers by the