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arm: Let the GDB stub write to SP, LR and GP registers

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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 <dsl@mcusim.org>
MFC after:	1 week
This commit is contained in:
markj 2020-12-07 15:09:28 +00:00
parent d8b227f766
commit d1593b2a41
2 changed files with 18 additions and 2 deletions
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18
sys/arm/arm/gdb_machdep.c
View File

@ -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;
}
}

2
sys/arm/include/gdb_machdep.h
View File

@ -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