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Re-add user_dbreg_trap() for debug register support

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This commit is contained in:
Peter Wemm 2004-01-29 00:05:03 +00:00
parent db5272252f
commit 170a05510d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=125182
2 changed files with 20 additions and 0 deletions
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19
sys/amd64/amd64/trap.c
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@ -396,6 +396,25 @@ trap(frame)
break;
case T_TRCTRAP: /* trace trap */
/*
* Ignore debug register trace traps due to
* accesses in the user's address space, which
* can happen under several conditions such as
* if a user sets a watchpoint on a buffer and
* then passes that buffer to a system call.
* We still want to get TRCTRAPS for addresses
* in kernel space because that is useful when
* debugging the kernel.
*/
if (user_dbreg_trap()) {
/*
* Reset breakpoint bits because the
* processor doesn't
*/
/* XXX check upper bits here */
load_dr6(rdr6() & 0xfffffff0);
goto out;
}
/*
* FALLTHROUGH (TRCTRAP kernel mode, kernel address)
*/

1
sys/amd64/include/md_var.h
View File

@ -69,6 +69,7 @@ void pagezero(void *addr);
int is_physical_memory(vm_offset_t addr);
int isa_nmi(int cd);
void setidt(int idx, alias_for_inthand_t *func, int typ, int dpl, int ist);
int user_dbreg_trap(void);
void fpstate_drop(struct thread *td);
#endif /* !_MACHINE_MD_VAR_H_ */