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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
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From: Shahab Vahedi <shahab@synopsys.com>
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Date: Fri, 16 Jul 2021 16:49:15 +0200
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Subject: [PATCH 18/20] gdb: Fix numerical field extraction for target
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description "flags"
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The "val_print_type_code_flags ()" function is responsible for
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extraction of fields for "flags" data type. These data types are
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used when describing a custom register type in a target description
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XML. The logic used for the extraction though is not sound:
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unsigned field_len = TYPE_FIELD_BITSIZE (type, field);
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ULONGEST field_val
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= val >> (TYPE_FIELD_BITPOS (type, field) - field_len + 1);
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TYPE_FIELD_BITSIZE: The bit length of the field to be extracted.
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TYPE_FIELD_BITPOS: The starting position of the field; 0 is LSB.
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val: The register value.
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Imagine you have a field that starts at position 1 and its length
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is 4 bits. According to the third line of the code snippet the
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shifting right would become "val >> -2", or "val >> 0xfff...fe"
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to be precise. That will result in a "field_val" of 0.
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The correct extraction should be:
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ULONGEST field_val = val >> TYPE_FIELD_BITPOS (type, field);
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The rest of the algorithm that masks out the higher bits is OK.
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Co-Authored-By: Simon Marchi <simon.marchi@efficios.com>
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Will be a part of GDB 11:
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https://sourceware.org/git?p=binutils-gdb.git;a=commit;h=c9bd98593b785d9bf5f39c7aa74ed0226a23b830
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---
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gdb/valprint.c | 36 ++++++++++++++++++++++++++++++++++--
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1 file changed, 34 insertions(+), 2 deletions(-)
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--- a/gdb/valprint.c
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+++ b/gdb/valprint.c
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@@ -40,6 +40,8 @@
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#include "gdbarch.h"
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#include "cli/cli-style.h"
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#include "count-one-bits.h"
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+#include "gdbsupport/selftest.h"
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+#include "selftest-arch.h"
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/* Maximum number of wchars returned from wchar_iterate. */
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#define MAX_WCHARS 4
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@@ -1157,8 +1159,7 @@
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else
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{
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unsigned field_len = TYPE_FIELD_BITSIZE (type, field);
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- ULONGEST field_val
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- = val >> (TYPE_FIELD_BITPOS (type, field) - field_len + 1);
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+ ULONGEST field_val = val >> TYPE_FIELD_BITPOS (type, field);
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if (field_len < sizeof (ULONGEST) * TARGET_CHAR_BIT)
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field_val &= ((ULONGEST) 1 << field_len) - 1;
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@@ -3100,10 +3101,41 @@
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return {{value_print_option_defs}, opts};
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}
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+#if GDB_SELF_TEST
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+
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+/* Test printing of TYPE_CODE_FLAGS values. */
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+
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+static void
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+test_print_flags (gdbarch *arch)
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+{
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+ type *flags_type = arch_flags_type (arch, "test_type", 32);
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+ type *field_type = builtin_type (arch)->builtin_uint32;
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+
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+ /* Value: 1010 1010
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+ Fields: CCCB BAAA */
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+ append_flags_type_field (flags_type, 0, 3, field_type, "A");
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+ append_flags_type_field (flags_type, 3, 2, field_type, "B");
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+ append_flags_type_field (flags_type, 5, 3, field_type, "C");
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+
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+ value *val = allocate_value (flags_type);
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+ gdb_byte *contents = value_contents_writeable (val);
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+ store_unsigned_integer (contents, 4, gdbarch_byte_order (arch), 0xaa);
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+
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+ string_file out;
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+ val_print_type_code_flags (flags_type, val, 0, &out);
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+ SELF_CHECK (out.string () == "[ A=2 B=1 C=5 ]");
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+}
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+
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+#endif
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+
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void _initialize_valprint ();
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void
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_initialize_valprint ()
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{
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+#if GDB_SELF_TEST
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+ selftests::register_test_foreach_arch ("print-flags", test_print_flags);
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+#endif
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+
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cmd_list_element *cmd;
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add_basic_prefix_cmd ("print", no_class,
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