Changeset c0c0bd5 for tools/gdb

Timestamp:

Apr 15, 2021, 2:58:49 PM (4 years ago)

Author:

Thierry Delisle <tdelisle@…>

Branches:

ADT, arm-eh, ast-experimental, enum, forall-pointer-decay, jacob/cs343-translation, master, new-ast-unique-expr, pthread-emulation, qualifiedEnum

Children:

84cd72d

Parents:

76c94bf

Message:

Attempt to make gdb utils more robust by pretending threads just entered the context switch.

File:

• tools/gdb/utils-gdb.py (modified) (3 diffs)

tools/gdb/utils-gdb.py

@@ -480 +480 @@
                 context = thread['context']
 
+
+
+                # must be at frame 0 to set pc register
+                gdb.execute('select-frame 0')
+                if gdb.selected_frame().architecture().name() != 'i386:x86-64':
+                        print('gdb debugging only supported for i386:x86-64 for now')
+                        return
+
+                # gdb seems to handle things much better if we pretend we just entered the context switch
+                # pretend the pc is __cfactx_switch and adjust the sp, base pointer doesn't need to change
                 # lookup for sp,fp and uSwitch
-                xsp = context['SP'] + 48
+                xsp = context['SP'] + 40 # 40 = 5 64bit registers : %r15, %r14, %r13, %r12, %rbx WARNING: x64 specific
                 xfp = context['FP']
 
                 # convert string so we can strip out the address
                 try:
-                        xpc = get_addr(gdb.parse_and_eval('__cfactx_switch').address + 28)
+                        xpc = get_addr(gdb.parse_and_eval('__cfactx_switch').address)
                 except:
                         print("here")
                         return
-
-                # must be at frame 0 to set pc register
-                gdb.execute('select-frame 0')
 
                 # push sp, fp, pc into a global stack
@@ -503 +510 @@
 
                 # update registers for new task
-                print('switching to ')
+                # print('switching to {} ({}) : [{}, {}, {}]'.format(thread['self_cor']['name'].string(), str(thread), str(xsp), str(xfp), str(xpc)))
+                print('switching to thread {} ({})'.format(str(thread), thread['self_cor']['name'].string()))
                 gdb.execute('set $rsp={}'.format(xsp))
                 gdb.execute('set $rbp={}'.format(xfp))
@@ -552 +560 @@
 
                 argv = parse(arg)
-                print(argv)
                 if argv[0].isdigit():
                         cname = " ".join(argv[1:]) if len(argv) > 1 else None