mirror of
https://github.com/crosstool-ng/crosstool-ng.git
synced 2024-12-27 16:18:52 +00:00
8099a74750
Here we add a couple of fixes and improvements for ARC processors. All except 1 patch are already in the upstream "master" branch and will be an essential part of GCC 11.x whenever it gets released. The most important are first 4 patches (0005-0008) which introduce support of full native GDB support in Linux on ARC. And the rests are tiny, yet useful improvements. Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
102 lines
3.2 KiB
Diff
102 lines
3.2 KiB
Diff
From b99b999fc7a0d0888b62e3bdedd0b4855bdf955c Mon Sep 17 00:00:00 2001
|
|
From: Shahab Vahedi <shahab@synopsys.com>
|
|
Date: Fri, 16 Jul 2021 16:49:15 +0200
|
|
Subject: [PATCH 18/20] gdb: Fix numerical field extraction for target
|
|
description "flags"
|
|
|
|
The "val_print_type_code_flags ()" function is responsible for
|
|
extraction of fields for "flags" data type. These data types are
|
|
used when describing a custom register type in a target description
|
|
XML. The logic used for the extraction though is not sound:
|
|
|
|
unsigned field_len = TYPE_FIELD_BITSIZE (type, field);
|
|
ULONGEST field_val
|
|
= val >> (TYPE_FIELD_BITPOS (type, field) - field_len + 1);
|
|
|
|
TYPE_FIELD_BITSIZE: The bit length of the field to be extracted.
|
|
TYPE_FIELD_BITPOS: The starting position of the field; 0 is LSB.
|
|
val: The register value.
|
|
|
|
Imagine you have a field that starts at position 1 and its length
|
|
is 4 bits. According to the third line of the code snippet the
|
|
shifting right would become "val >> -2", or "val >> 0xfff...fe"
|
|
to be precise. That will result in a "field_val" of 0.
|
|
|
|
The correct extraction should be:
|
|
|
|
ULONGEST field_val = val >> TYPE_FIELD_BITPOS (type, field);
|
|
|
|
The rest of the algorithm that masks out the higher bits is OK.
|
|
|
|
Co-Authored-By: Simon Marchi <simon.marchi@efficios.com>
|
|
|
|
Will be a part of GDB 11:
|
|
https://sourceware.org/git?p=binutils-gdb.git;a=commit;h=c9bd98593b785d9bf5f39c7aa74ed0226a23b830
|
|
---
|
|
gdb/valprint.c | 36 ++++++++++++++++++++++++++++++++++--
|
|
1 file changed, 34 insertions(+), 2 deletions(-)
|
|
|
|
--- a/gdb/valprint.c
|
|
+++ b/gdb/valprint.c
|
|
@@ -40,6 +40,8 @@
|
|
#include "gdbarch.h"
|
|
#include "cli/cli-style.h"
|
|
#include "count-one-bits.h"
|
|
+#include "gdbsupport/selftest.h"
|
|
+#include "selftest-arch.h"
|
|
|
|
/* Maximum number of wchars returned from wchar_iterate. */
|
|
#define MAX_WCHARS 4
|
|
@@ -1157,8 +1159,7 @@
|
|
else
|
|
{
|
|
unsigned field_len = TYPE_FIELD_BITSIZE (type, field);
|
|
- ULONGEST field_val
|
|
- = val >> (TYPE_FIELD_BITPOS (type, field) - field_len + 1);
|
|
+ ULONGEST field_val = val >> TYPE_FIELD_BITPOS (type, field);
|
|
|
|
if (field_len < sizeof (ULONGEST) * TARGET_CHAR_BIT)
|
|
field_val &= ((ULONGEST) 1 << field_len) - 1;
|
|
@@ -3100,10 +3101,41 @@
|
|
return {{value_print_option_defs}, opts};
|
|
}
|
|
|
|
+#if GDB_SELF_TEST
|
|
+
|
|
+/* Test printing of TYPE_CODE_FLAGS values. */
|
|
+
|
|
+static void
|
|
+test_print_flags (gdbarch *arch)
|
|
+{
|
|
+ type *flags_type = arch_flags_type (arch, "test_type", 32);
|
|
+ type *field_type = builtin_type (arch)->builtin_uint32;
|
|
+
|
|
+ /* Value: 1010 1010
|
|
+ Fields: CCCB BAAA */
|
|
+ append_flags_type_field (flags_type, 0, 3, field_type, "A");
|
|
+ append_flags_type_field (flags_type, 3, 2, field_type, "B");
|
|
+ append_flags_type_field (flags_type, 5, 3, field_type, "C");
|
|
+
|
|
+ value *val = allocate_value (flags_type);
|
|
+ gdb_byte *contents = value_contents_writeable (val);
|
|
+ store_unsigned_integer (contents, 4, gdbarch_byte_order (arch), 0xaa);
|
|
+
|
|
+ string_file out;
|
|
+ val_print_type_code_flags (flags_type, val, 0, &out);
|
|
+ SELF_CHECK (out.string () == "[ A=2 B=1 C=5 ]");
|
|
+}
|
|
+
|
|
+#endif
|
|
+
|
|
void _initialize_valprint ();
|
|
void
|
|
_initialize_valprint ()
|
|
{
|
|
+#if GDB_SELF_TEST
|
|
+ selftests::register_test_foreach_arch ("print-flags", test_print_flags);
|
|
+#endif
|
|
+
|
|
cmd_list_element *cmd;
|
|
|
|
add_basic_prefix_cmd ("print", no_class,
|