Author: markj
Date: Mon Dec 7 15:09:28 2020
New Revision: 368414
URL: https://svnweb.freebsd.org/changeset/base/368414
Log:
arm: Let the GDB stub write to SP, LR and GP registers
This can be handy if gdb's stack unwinder fails, for example because of
a bug in kgdb's trap frame unwinder.
PR: 251463
Submitted by: Dmitry Salychev <d...@mcusim.org>
MFC after: 1 week
Modified:
head/sys/arm/arm/gdb_machdep.c
head/sys/arm/include/gdb_machdep.h
Modified: head/sys/arm/arm/gdb_machdep.c
==============================================================================
--- head/sys/arm/arm/gdb_machdep.c Mon Dec 7 14:53:34 2020
(r368413)
+++ head/sys/arm/arm/gdb_machdep.c Mon Dec 7 15:09:28 2020
(r368414)
@@ -97,11 +97,25 @@ gdb_cpu_getreg(int regnum, size_t *regsz)
void
gdb_cpu_setreg(int regnum, void *val)
{
+ if (kdb_thread != curthread)
+ return;
switch (regnum) {
case GDB_REG_PC:
- if (kdb_thread == curthread)
- kdb_frame->tf_pc = *(register_t *)val;
+ kdb_frame->tf_pc = *(register_t *)val;
+ break;
+ case GDB_REG_SP:
+ kdb_frame->tf_svc_sp = *(register_t *)val;
+ break;
+ case GDB_REG_LR:
+ kdb_frame->tf_svc_lr = *(register_t *)val;
+ break;
+ default:
+ /* Write to the general purpose registers r0-r12. */
+ if (regnum >= 0 && regnum <= 12) {
+ *(&kdb_frame->tf_r0 + regnum) = *(register_t *)val;
+ }
+ break;
}
}
Modified: head/sys/arm/include/gdb_machdep.h
==============================================================================
--- head/sys/arm/include/gdb_machdep.h Mon Dec 7 14:53:34 2020
(r368413)
+++ head/sys/arm/include/gdb_machdep.h Mon Dec 7 15:09:28 2020
(r368414)
@@ -33,6 +33,8 @@
#define GDB_BUFSZ 400
#define GDB_NREGS 26
+#define GDB_REG_SP 13
+#define GDB_REG_LR 14
#define GDB_REG_PC 15
static __inline size_t
_______________________________________________
svn-src-head@freebsd.org mailing list
https://lists.freebsd.org/mailman/listinfo/svn-src-head
To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
