| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20240815173903.4172139-31-samitolvanen@google.com>
Date: Thu, 15 Aug 2024 17:39:14 +0000
From: Sami Tolvanen <samitolvanen@...gle.com>
To: Masahiro Yamada <masahiroy@...nel.org>, Luis Chamberlain <mcgrof@...nel.org>,
Miguel Ojeda <ojeda@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Matthew Maurer <mmaurer@...gle.com>, Alex Gaynor <alex.gaynor@...il.com>,
Wedson Almeida Filho <wedsonaf@...il.com>, Gary Guo <gary@...yguo.net>, Petr Pavlu <petr.pavlu@...e.com>,
Neal Gompa <neal@...pa.dev>, Hector Martin <marcan@...can.st>, Janne Grunau <j@...nau.net>,
Asahi Linux <asahi@...ts.linux.dev>, linux-kbuild@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-modules@...r.kernel.org,
rust-for-linux@...r.kernel.org, Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH v2 10/19] gendwarfksyms: Expand structure types
Recursively expand DWARF structure types, i.e. structs, unions, and
enums. Also include relevant DWARF attributes in type strings to
encode structure layout, for example.
Example output with --debug:
subprogram(
formal_parameter pointer_type *mut &str {
structure_type &str {
member pointer_type <unnamed> {
base_type u8 byte_size(1) encoding(7)
} data_member_location(0),
member base_type usize byte_size(8) encoding(7) data_member_location(8),
} byte_size(16) alignment(8)
},
)
-> base_type void;
Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
---
scripts/gendwarfksyms/dwarf.c | 129 +++++++++++++++++++++++++-
scripts/gendwarfksyms/gendwarfksyms.h | 5 +
2 files changed, 132 insertions(+), 2 deletions(-)
diff --git a/scripts/gendwarfksyms/dwarf.c b/scripts/gendwarfksyms/dwarf.c
index 4ec69fce95f3..92b6ca4c5c91 100644
--- a/scripts/gendwarfksyms/dwarf.c
+++ b/scripts/gendwarfksyms/dwarf.c
@@ -206,9 +206,13 @@ static int process_fqn(struct state *state, struct die *cache, Dwarf_Die *die)
return 0; \
}
+DEFINE_PROCESS_UDATA_ATTRIBUTE(accessibility)
DEFINE_PROCESS_UDATA_ATTRIBUTE(alignment)
+DEFINE_PROCESS_UDATA_ATTRIBUTE(bit_size)
DEFINE_PROCESS_UDATA_ATTRIBUTE(byte_size)
DEFINE_PROCESS_UDATA_ATTRIBUTE(encoding)
+DEFINE_PROCESS_UDATA_ATTRIBUTE(data_bit_offset)
+DEFINE_PROCESS_UDATA_ATTRIBUTE(data_member_location)
/* Match functions -- die_match_callback_t */
#define DEFINE_MATCH(type) \
@@ -217,8 +221,11 @@ DEFINE_PROCESS_UDATA_ATTRIBUTE(encoding)
return dwarf_tag(die) == DW_TAG_##type##_type; \
}
+DEFINE_MATCH(enumerator)
DEFINE_MATCH(formal_parameter)
+DEFINE_MATCH(member)
DEFINE_MATCH(subrange)
+DEFINE_MATCH(variant)
bool match_all(Dwarf_Die *die)
{
@@ -263,6 +270,10 @@ static int __process_list_type(struct state *state, struct die *cache,
{
check(process(state, cache, type));
check(process_type_attr(state, cache, die));
+ check(process_accessibility_attr(state, cache, die));
+ check(process_bit_size_attr(state, cache, die));
+ check(process_data_bit_offset_attr(state, cache, die));
+ check(process_data_member_location_attr(state, cache, die));
check(process(state, cache, ","));
return check(process_linebreak(cache, 0));
}
@@ -275,6 +286,7 @@ static int __process_list_type(struct state *state, struct die *cache,
}
DEFINE_PROCESS_LIST_TYPE(formal_parameter)
+DEFINE_PROCESS_LIST_TYPE(member)
/* Container types with DW_AT_type */
static int __process_type(struct state *state, struct die *cache,
@@ -307,6 +319,7 @@ DEFINE_PROCESS_TYPE(reference)
DEFINE_PROCESS_TYPE(restrict)
DEFINE_PROCESS_TYPE(rvalue_reference)
DEFINE_PROCESS_TYPE(shared)
+DEFINE_PROCESS_TYPE(template_type_parameter)
DEFINE_PROCESS_TYPE(volatile)
DEFINE_PROCESS_TYPE(typedef)
@@ -361,6 +374,108 @@ static int process_subroutine_type(struct state *state, struct die *cache,
return check(__process_subroutine_type(state, cache, die,
"subroutine_type"));
}
+static int process_variant_type(struct state *state, struct die *cache,
+ Dwarf_Die *die)
+{
+ return check(process_die_container(state, cache, die, process_type,
+ match_member_type));
+}
+
+static int process_variant_part_type(struct state *state, struct die *cache,
+ Dwarf_Die *die)
+{
+ check(process(state, cache, "variant_part {"));
+ check(process_linebreak(cache, 1));
+ check(process_die_container(state, cache, die, process_type,
+ match_variant_type));
+ check(process_linebreak(cache, -1));
+ check(process(state, cache, "},"));
+ return check(process_linebreak(cache, 0));
+}
+
+static int ___process_structure_type(struct state *state, struct die *cache,
+ Dwarf_Die *die)
+{
+ switch (dwarf_tag(die)) {
+ case DW_TAG_member:
+ case DW_TAG_variant_part:
+ return check(process_type(state, cache, die));
+ case DW_TAG_class_type:
+ case DW_TAG_enumeration_type:
+ case DW_TAG_structure_type:
+ case DW_TAG_template_type_parameter:
+ case DW_TAG_union_type:
+ check(process_type(state, cache, die));
+ check(process(state, cache, ","));
+ return check(process_linebreak(cache, 0));
+ case DW_TAG_subprogram:
+ return 0; /* Skip member functions */
+ default:
+ error("unexpected structure_type child: %x", dwarf_tag(die));
+ return -1;
+ }
+}
+
+static int __process_structure_type(struct state *state, struct die *cache,
+ Dwarf_Die *die, const char *type,
+ die_callback_t process_func,
+ die_match_callback_t match_func)
+{
+ check(process(state, cache, type));
+ check(process_fqn(state, cache, die));
+ check(process(state, cache, " {"));
+ check(process_linebreak(cache, 1));
+
+ check(process_die_container(state, cache, die, process_func,
+ match_func));
+
+ check(process_linebreak(cache, -1));
+ check(process(state, cache, "}"));
+
+ check(process_byte_size_attr(state, cache, die));
+ check(process_alignment_attr(state, cache, die));
+
+ return 0;
+}
+
+#define DEFINE_PROCESS_STRUCTURE_TYPE(structure) \
+ static int process_##structure##_type( \
+ struct state *state, struct die *cache, Dwarf_Die *die) \
+ { \
+ return check(__process_structure_type( \
+ state, cache, die, #structure "_type ", \
+ ___process_structure_type, match_all)); \
+ }
+
+DEFINE_PROCESS_STRUCTURE_TYPE(class)
+DEFINE_PROCESS_STRUCTURE_TYPE(structure)
+DEFINE_PROCESS_STRUCTURE_TYPE(union)
+
+static int process_enumerator_type(struct state *state, struct die *cache,
+ Dwarf_Die *die)
+{
+ Dwarf_Word value;
+
+ check(process(state, cache, "enumerator "));
+ check(process_fqn(state, cache, die));
+
+ if (get_udata_attr(die, DW_AT_const_value, &value)) {
+ check(process(state, cache, " = "));
+ check(process_fmt(state, cache, "%" PRIu64, value));
+ }
+
+ check(process(state, cache, ","));
+ return check(process_linebreak(cache, 0));
+}
+
+static int process_enumeration_type(struct state *state, struct die *cache,
+ Dwarf_Die *die)
+{
+ return check(__process_structure_type(state, cache, die,
+ "enumeration_type ", process_type,
+ match_enumerator_type));
+}
+
static int process_base_type(struct state *state, struct die *cache,
Dwarf_Die *die)
{
@@ -438,17 +553,27 @@ static int process_type(struct state *state, struct die *parent, Dwarf_Die *die)
PROCESS_TYPE(rvalue_reference)
PROCESS_TYPE(shared)
PROCESS_TYPE(volatile)
+ /* Container types */
+ PROCESS_TYPE(class)
+ PROCESS_TYPE(structure)
+ PROCESS_TYPE(union)
+ PROCESS_TYPE(enumeration)
/* Subtypes */
+ PROCESS_TYPE(enumerator)
PROCESS_TYPE(formal_parameter)
+ PROCESS_TYPE(member)
PROCESS_TYPE(subrange)
+ PROCESS_TYPE(template_type_parameter)
+ PROCESS_TYPE(variant)
+ PROCESS_TYPE(variant_part)
/* Other types */
PROCESS_TYPE(array)
PROCESS_TYPE(base)
PROCESS_TYPE(subroutine)
PROCESS_TYPE(typedef)
default:
- debug("unimplemented type: %x", tag);
- break;
+ error("unexpected type: %x", tag);
+ return -1;
}
/* Update cache state and append to the parent (if any) */
diff --git a/scripts/gendwarfksyms/gendwarfksyms.h b/scripts/gendwarfksyms/gendwarfksyms.h
index 25f87485eb69..7d32ccd590f8 100644
--- a/scripts/gendwarfksyms/gendwarfksyms.h
+++ b/scripts/gendwarfksyms/gendwarfksyms.h
@@ -59,8 +59,13 @@ extern bool debug;
#define checkp(expr) __check(expr, __res < 0, __res)
/* Consistent aliases (DW_TAG_<type>_type) for DWARF tags */
+#define DW_TAG_enumerator_type DW_TAG_enumerator
#define DW_TAG_formal_parameter_type DW_TAG_formal_parameter
+#define DW_TAG_member_type DW_TAG_member
+#define DW_TAG_template_type_parameter_type DW_TAG_template_type_parameter
#define DW_TAG_typedef_type DW_TAG_typedef
+#define DW_TAG_variant_part_type DW_TAG_variant_part
+#define DW_TAG_variant_type DW_TAG_variant
/*
* symbols.c
--
2.46.0.184.g6999bdac58-goog
Powered by blists - more mailing lists