From b77b02a5ca5a021ee8b5e5453e8843447d1132b2 Mon Sep 17 00:00:00 2001 From: Yao Qi Date: Wed, 24 May 2017 22:15:23 +0100 Subject: Add unit test to gdbarch methods register_to_value and value_to_register This patch adds one unit test for gdbarch methods register_to_value and value_to_register. The test pass different combinations of {regnu, type} to gdbarch_register_to_value and gdbarch_value_to_register. In order to do the test, add a new function create_new_frame to create a fake frame. It can be improved after we converted frame_info to class. In order to isolate regcache (from target_ops operations on writing registers, like target_store_registers), the sub-class of regcache in the test override raw_write. Also, in order to get the right regcache from get_thread_arch_aspace_regcache, the sub-class of regcache inserts itself to current_regcache. Suppose I incorrectly modified the size of buffer as below, @@ -1228,7 +1228,7 @@ ia64_register_to_value (struct frame_info *frame, int regnum, int *optimizedp, int *unavailablep) { struct gdbarch *gdbarch = get_frame_arch (frame); - gdb_byte in[MAX_REGISTER_SIZE]; + gdb_byte in[1]; /* Convert to TYPE. */ if (!get_frame_register_bytes (frame, regnum, 0, build GDB with "-fsanitize=address" and run unittest.exp, asan can detect such error ==2302==ERROR: AddressSanitizer: stack-buffer-overflow on address 0x7fff98193870 at pc 0xbd55ea bp 0x7fff981935a0 sp 0x7fff98193598 WRITE of size 16 at 0x7fff98193870 thread T0 #0 0xbd55e9 in frame_register_unwind(frame_info*, int, int*, int*, lval_type*, unsigned long*, int*, unsigned char*) /home/yao/SourceCode/gnu/gdb/git/gdb/frame.c:1119 #1 0xbd58c8 in frame_register(frame_info*, int, int*, int*, lval_type*, unsigned long*, int*, unsigned char*) /home/yao/SourceCode/gnu/gdb/git/gdb/frame.c:1147 #2 0xbd6e25 in get_frame_register_bytes(frame_info*, int, unsigned long, int, unsigned char*, int*, int*) /home/yao/SourceCode/gnu/gdb/git/gdb/frame.c:1427 #3 0x70080a in ia64_register_to_value /home/yao/SourceCode/gnu/gdb/git/gdb/ia64-tdep.c:1236 #4 0xbf570e in gdbarch_register_to_value(gdbarch*, frame_info*, int, type*, unsigned char*, int*, int*) /home/yao/SourceCode/gnu/gdb/git/gdb/gdbarch.c:2619 #5 0xc05975 in register_to_value_test /home/yao/SourceCode/gnu/gdb/git/gdb/gdbarch-selftests.c:131 Or, even if GDB is not built with asan, GDB just crashes. *** stack smashing detected ***: ./gdb terminated Aborted (core dumped) gdb: 2017-05-24 Yao Qi * Makefile.in (SFILES): Add gdbarch-selftests.c. (COMMON_OBS): Add gdbarch-selftests.o. * frame.c [GDB_SELF_TESTS] (create_new_frame): New function. * frame.h [GDB_SELF_TESTS] (create_new_frame): Declare. * gdbarch-selftests.c: New file. * regcache.h (regcache) <~regcache>: Mark it virtual if GDB_SELF_TEST. : Likewise. --- gdb/frame.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'gdb/frame.c') diff --git a/gdb/frame.c b/gdb/frame.c index d4fc456..efe5a20 100644 --- a/gdb/frame.c +++ b/gdb/frame.c @@ -1704,6 +1704,23 @@ select_frame (struct frame_info *fi) } } +#if GDB_SELF_TEST +struct frame_info * +create_test_frame (struct regcache *regcache) +{ + struct frame_info *this_frame = XCNEW (struct frame_info); + + sentinel_frame = create_sentinel_frame (NULL, regcache); + sentinel_frame->prev = this_frame; + sentinel_frame->prev_p = 1;; + this_frame->prev_arch.p = 1; + this_frame->prev_arch.arch = get_regcache_arch (regcache); + this_frame->next = sentinel_frame; + + return this_frame; +} +#endif + /* Create an arbitrary (i.e. address specified by user) or innermost frame. Always returns a non-NULL value. */ -- cgit v1.1