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Add function LongJmp which checks the parameters before calling

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longjmp.  I suspect that the occasional double panic may be the result
of incorrect parameters to longjmp.  This happens, of course, like the
entire file, only with -DVINUMDEBUG.
This commit is contained in:
Greg Lehey 1999-03-28 08:54:03 +00:00
parent 738082e8b0
commit 1238689209
1 changed files with 48 additions and 7 deletions
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55
sys/dev/vinum/vinummemory.c
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@ -33,24 +33,65 @@
* otherwise) arising in any way out of the use of this software, even if
* advised of the possibility of such damage.
*
* $Id: vinummemory.c,v 1.19 1998/12/30 06:22:26 grog Exp grog $
* $Id: vinummemory.c,v 1.20 1999/03/19 03:21:08 grog Exp grog $
*/
#define REALLYKERNEL
#include "opt_vinum.h"
#include <dev/vinum/vinumhdr.h>
extern jmp_buf command_fail; /* return on a failed command */
#ifdef VINUMDEBUG
jmp_buf command_fail; /* return on a failed command */
#undef longjmp /* this was defined as LongJmp */
void longjmp(jmp_buf, int); /* the kernel doesn't define this */
#include <dev/vinum/request.h>
extern struct rqinfo rqinfo[];
extern struct rqinfo *rqip;
#endif
/* Why aren't these declared anywhere? XXX */
int setjmp(jmp_buf);
void longjmp(jmp_buf, int);
#ifdef __i386__ /* check for validity */
void
LongJmp(jmp_buf buf, int retval)
{
/*
* longjmp is not documented, not even jmp_buf.
* This is what's in i386/i386/support.s:
* ENTRY(longjmp)
* movl 4(%esp),%eax
* movl (%eax),%ebx restore ebx
* movl 4(%eax),%esp restore esp
* movl 8(%eax),%ebp restore ebp
* movl 12(%eax),%esi restore esi
* movl 16(%eax),%edi restore edi
* movl 20(%eax),%edx get rta
* movl %edx,(%esp) put in return frame
* xorl %eax,%eax return(1);
* incl %eax
* ret
*
* from which we deduce the structure of jmp_buf:
*/
struct JmpBuf {
int jb_ebx;
int jb_esp;
int jb_ebp;
int jb_esi;
int jb_edi;
int jb_eip;
};
struct JmpBuf *jb = (struct JmpBuf *) buf;
if ((jb->jb_esp < 0xd0000000)
|| (jb->jb_ebp < 0xd0000000)
|| (jb->jb_eip < 0xe0000000))
panic("Invalid longjmp");
longjmp(buf, retval);
}
#else
#define LongJmp longjmp /* just use the kernel function */
#endif
#endif
void
expand_table(void **table, int oldsize, int newsize)