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[arch][arm-m] debugger info

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Use the reserved cortex-m vectors 8 and 9 for a magic cookie and
pointer to a debugger info structure.  This structure contains
pointers to the threadlist, the current thread pointer, and
offsets to important members of the thread structure.  With
this information, an attached debugger can walk the threadlist
and obtain state, name, registers, etc for each thread.

Use global define WITH_DEBUGGER_INFO to enable this.
This commit is contained in:
Brian Swetland
2015-07-09 17:39:25 -07:00
parent 141e4ffaa5
commit e21e81f24d
2 changed files with 39 additions and 1 deletions
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9
arch/arm/arm-m/vectab.c
View File

@@ -41,6 +41,10 @@ extern void _pendsv(void);
extern void _pendsv(void);
extern void _systick(void);
#if defined(WITH_DEBUGGER_INFO)
extern struct __debugger_info__ _debugger_info;
#endif
const void * const __SECTION(".text.boot.vectab1") vectab[] = {
/* arm exceptions */
initial_stack + sizeof(initial_stack),
@@ -51,8 +55,13 @@ const void * const __SECTION(".text.boot.vectab1") vectab[] = {
_busfault, // bus fault
_usagefault, // usage fault
0, // reserved
#if defined(WITH_DEBUGGER_INFO)
(void*) 0x52474244,
&_debugger_info,
#else
0, // reserved
0, // reserved
#endif
0, // reserved
_svc, // svcall
0, // debug monitor

31
kernel/thread.c
View File

@@ -1230,5 +1230,34 @@ status_t thread_unblock_from_wait_queue(thread_t *t, status_t wait_queue_error)
return NO_ERROR;
}
/* vim: set ts=4 sw=4 noexpandtab: */
#if defined(WITH_DEBUGGER_INFO)
// This is, by necessity, arch-specific, and arm-m specific right now,
// but lives here due to thread_list being static.
//
// It contains sufficient information for a remote debugger to walk
// the thread list without needing the symbols and debug sections in
// the elf binary for lk or the ability to parse them.
const struct __debugger_info__ {
u32 version; // flags:16 major:8 minor:8
void *thread_list_ptr;
void *current_thread_ptr;
u8 off_list_node;
u8 off_state;
u8 off_saved_sp;
u8 off_was_preempted;
u8 off_name;
u8 off_waitq;
} _debugger_info = {
.version = 0x0100,
.thread_list_ptr = &thread_list,
.current_thread_ptr = &_current_thread,
.off_list_node = __builtin_offsetof(thread_t, thread_list_node),
.off_state = __builtin_offsetof(thread_t, state),
.off_saved_sp = __builtin_offsetof(thread_t, arch.sp),
.off_was_preempted = __builtin_offsetof(thread_t, arch.was_preempted),
.off_name = __builtin_offsetof(thread_t, name),
.off_waitq = __builtin_offsetof(thread_t, blocking_wait_queue),
};
#endif
/* vim: set ts=4 sw=4 noexpandtab: */