diff mbox series

ctf-reader: looks for debug information in out-of-tree modules

Message ID 20220815193209.3631681-1-guillermo.e.martinez@oracle.com
State New
Headers
Series ctf-reader: looks for debug information in out-of-tree modules |

Commit Message

Guillermo E. Martinez Aug. 15, 2022, 7:32 p.m. UTC 
  Hello libabigail team,

This patch add support to extract the kABI from out-of-tree
Linux Kernel modules.

Please let know your thoughts.

Thanks!,
guillermo
--

The archive `vmlinux.ctfa' contain CTF debug information for
all the types used by more than one module, CTF for the core
kernel and CTF for each module compiled in Linux tree directory.
CTF information for out-of-tree module is not present in
`vmlinux.ctfa' file, even so, the compiler can emit the `.ctf'
section into the out-of-tree modules and it can be extracted
by the libabigail tools.

	* src/abg-ctf-reader.cc (process_ctf_archive, read_corpus
	slurp_elf_info): Avoid looks for `vmlinux.ctfa' when
	we aren't processing a `cur_corpus_group_'. So CTF
	info is embedded in the `.ko' file.
	* tests/data/Makefile.am: Add test inputs and expected files.
	* tests/data/test-read-ctf/test-linux-module.{ko,c,abi}: Add
	new test input and reference kABI.
	* tests/test-read-ctf.cc: Add new testcase.

Signed-off-by: Guillermo E. Martinez <guillermo.e.martinez@oracle.com>
---
 src/abg-ctf-reader.cc                         |   9 ++-
 tests/data/Makefile.am                        |   3 +
 .../data/test-read-ctf/test-linux-module.abi  |  65 ++++++++++++++++++
 tests/data/test-read-ctf/test-linux-module.c  |  37 ++++++++++
 tests/data/test-read-ctf/test-linux-module.ko | Bin 0 -> 26248 bytes
 tests/test-read-ctf.cc                        |   9 +++
 6 files changed, 120 insertions(+), 3 deletions(-)
 create mode 100644 tests/data/test-read-ctf/test-linux-module.abi
 create mode 100644 tests/data/test-read-ctf/test-linux-module.c
 create mode 100644 tests/data/test-read-ctf/test-linux-module.ko

Comments

Dodji Seketeli Aug. 29, 2022, 11:02 a.m. UTC | #1 
Hello,

"Guillermo E. Martinez via Libabigail" <libabigail@sourceware.org> a
écrit:

> --
>
> The archive `vmlinux.ctfa' contain CTF debug information for
> all the types used by more than one module, CTF for the core
> kernel and CTF for each module compiled in Linux tree directory.
> CTF information for out-of-tree module is not present in
> `vmlinux.ctfa' file, even so, the compiler can emit the `.ctf'
> section into the out-of-tree modules and it can be extracted
> by the libabigail tools.
>
> 	* src/abg-ctf-reader.cc (process_ctf_archive, read_corpus
> 	slurp_elf_info): Avoid looks for `vmlinux.ctfa' when
> 	we aren't processing a `cur_corpus_group_'. So CTF
> 	info is embedded in the `.ko' file.
> 	* tests/data/Makefile.am: Add test inputs and expected files.
> 	* tests/data/test-read-ctf/test-linux-module.{ko,c,abi}: Add
> 	new test input and reference kABI.
> 	* tests/test-read-ctf.cc: Add new testcase.
>
> Signed-off-by: Guillermo E. Martinez <guillermo.e.martinez@oracle.com>

Applied to master, thanks!

[...]

Cheers,
diff mbox series

Patch

diff --git a/src/abg-ctf-reader.cc b/src/abg-ctf-reader.cc
index c1ea15aa..71808f9a 100644
--- a/src/abg-ctf-reader.cc
+++ b/src/abg-ctf-reader.cc
@@ -1228,7 +1228,8 @@  process_ctf_archive(read_context *ctxt, corpus_sptr corp)
   filter.set_public_symbols();
   std::string dict_name;
 
-  if (corp->get_origin() & corpus::LINUX_KERNEL_BINARY_ORIGIN)
+  if ((corp->get_origin() & corpus::LINUX_KERNEL_BINARY_ORIGIN)
+      && ctxt->cur_corpus_group_)
     {
       tools_utils::base_name(ctxt->filename, dict_name);
 
@@ -1472,7 +1473,8 @@  slurp_elf_info(read_context *ctxt,
   ABG_ASSERT(ctxt->symtab);
   corp->set_symtab(ctxt->symtab);
 
-  if (corp->get_origin() & corpus::LINUX_KERNEL_BINARY_ORIGIN)
+  if ((corp->get_origin() & corpus::LINUX_KERNEL_BINARY_ORIGIN)
+      && ctxt->cur_corpus_group_)
     {
       status |= elf_reader::STATUS_OK;
       return;
@@ -1613,7 +1615,8 @@  read_corpus(read_context *ctxt, elf_reader::status &status)
    (ctxt->cur_corpus_->get_exported_decls_builder().get());
 
   int errp;
-  if (corp->get_origin() & corpus::LINUX_KERNEL_BINARY_ORIGIN)
+  if ((corp->get_origin() & corpus::LINUX_KERNEL_BINARY_ORIGIN)
+      && ctxt->cur_corpus_group_)
     {
       if (ctxt->ctfa == NULL)
         {
diff --git a/tests/data/Makefile.am b/tests/data/Makefile.am
index c7875b01..ebfce623 100644
--- a/tests/data/Makefile.am
+++ b/tests/data/Makefile.am
@@ -683,6 +683,9 @@  test-read-ctf/test-callback2.abi	\
 test-read-ctf/test-anonymous-fields.c	\
 test-read-ctf/test-anonymous-fields.o	\
 test-read-ctf/test-anonymous-fields.o.abi	\
+test-read-ctf/test-linux-module.abi		\
+test-read-ctf/test-linux-module.c		\
+test-read-ctf/test-linux-module.ko		\
 \
 test-annotate/test0.abi			\
 test-annotate/test1.abi			\
diff --git a/tests/data/test-read-ctf/test-linux-module.abi b/tests/data/test-read-ctf/test-linux-module.abi
new file mode 100644
index 00000000..d6bff4e1
--- /dev/null
+++ b/tests/data/test-read-ctf/test-linux-module.abi
@@ -0,0 +1,65 @@ 
+<abi-corpus version='2.1' path='data/test-read-ctf/test-linux-module.ko'>
+  <elf-function-symbols>
+    <elf-symbol name='testexport' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes' crc='0x533ba8e8'/>
+    <elf-symbol name='testexport2' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes' crc='0x65900b2f'/>
+  </elf-function-symbols>
+  <elf-variable-symbols>
+    <elf-symbol name='global_sym' size='4' type='object-type' binding='global-binding' visibility='default-visibility' is-defined='yes' crc='0x44a6713b'/>
+  </elf-variable-symbols>
+  <abi-instr address-size='64' language='LANG_C'>
+    <type-decl name='int' size-in-bits='32' alignment-in-bits='32' id='type-id-1'/>
+    <class-decl name='__raw_tickets' size-in-bits='32' alignment-in-bits='16' is-struct='yes' visibility='default' id='type-id-2'>
+      <data-member access='public' layout-offset-in-bits='0'>
+        <var-decl name='owner' type-id='type-id-3' visibility='default'/>
+      </data-member>
+      <data-member access='public' layout-offset-in-bits='16'>
+        <var-decl name='next' type-id='type-id-3' visibility='default'/>
+      </data-member>
+    </class-decl>
+    <class-decl name='arch_spinlock_t' size-in-bits='32' alignment-in-bits='32' is-struct='yes' naming-typedef-id='type-id-4' visibility='default' id='type-id-5'>
+      <data-member access='public' layout-offset-in-bits='0'>
+        <var-decl name='' type-id='type-id-6' visibility='default'/>
+      </data-member>
+    </class-decl>
+    <class-decl name='raw_spinlock' size-in-bits='32' alignment-in-bits='32' is-struct='yes' visibility='default' id='type-id-7'>
+      <data-member access='public' layout-offset-in-bits='0'>
+        <var-decl name='raw_lock' type-id='type-id-4' visibility='default'/>
+      </data-member>
+    </class-decl>
+    <class-decl name='spinlock' size-in-bits='32' alignment-in-bits='32' is-struct='yes' visibility='default' id='type-id-8'>
+      <data-member access='public' layout-offset-in-bits='0'>
+        <var-decl name='' type-id='type-id-9' visibility='default'/>
+      </data-member>
+    </class-decl>
+    <union-decl name='' size-in-bits='32' is-anonymous='yes' visibility='default' id='type-id-9'>
+      <data-member access='public'>
+        <var-decl name='rlock' type-id='type-id-7' visibility='default'/>
+      </data-member>
+    </union-decl>
+    <union-decl name='' size-in-bits='32' is-anonymous='yes' visibility='default' id='type-id-6'>
+      <data-member access='public'>
+        <var-decl name='slock' type-id='type-id-10' visibility='default'/>
+      </data-member>
+      <data-member access='public'>
+        <var-decl name='tickets' type-id='type-id-2' visibility='default'/>
+      </data-member>
+    </union-decl>
+    <type-decl name='unsigned int' size-in-bits='32' alignment-in-bits='32' id='type-id-11'/>
+    <type-decl name='unsigned short int' size-in-bits='16' alignment-in-bits='16' id='type-id-12'/>
+    <pointer-type-def type-id='type-id-13' size-in-bits='64' alignment-in-bits='64' id='type-id-14'/>
+    <function-decl name='testexport' visibility='default' binding='global' size-in-bits='64' alignment-in-bits='8' elf-symbol-id='testexport'>
+      <return type-id='type-id-1'/>
+    </function-decl>
+    <function-decl name='testexport2' visibility='default' binding='global' size-in-bits='64' alignment-in-bits='8' elf-symbol-id='testexport2'>
+      <parameter type-id='type-id-14'/>
+      <return type-id='type-id-1'/>
+    </function-decl>
+    <var-decl name='global_sym' type-id='type-id-1' mangled-name='global_sym' visibility='default' elf-symbol-id='global_sym'/>
+    <typedef-decl name='__u16' type-id='type-id-12' id='type-id-15'/>
+    <typedef-decl name='__u32' type-id='type-id-11' id='type-id-16'/>
+    <typedef-decl name='arch_spinlock_t' type-id='type-id-5' id='type-id-4'/>
+    <typedef-decl name='spinlock_t' type-id='type-id-8' id='type-id-13'/>
+    <typedef-decl name='u16' type-id='type-id-15' id='type-id-3'/>
+    <typedef-decl name='u32' type-id='type-id-16' id='type-id-10'/>
+  </abi-instr>
+</abi-corpus>
diff --git a/tests/data/test-read-ctf/test-linux-module.c b/tests/data/test-read-ctf/test-linux-module.c
new file mode 100644
index 00000000..4a647aa7
--- /dev/null
+++ b/tests/data/test-read-ctf/test-linux-module.c
@@ -0,0 +1,37 @@ 
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+int global_sym = 0;
+EXPORT_SYMBOL(global_sym);
+static spinlock_t my_lock;
+
+int testexport(void)
+{
+  printk("in testexport\n");
+  return 0;
+}
+
+EXPORT_SYMBOL(testexport);
+
+int testexport2(spinlock_t *t)
+{
+  printk("in testexport\n");
+  return 0;
+}
+EXPORT_SYMBOL(testexport2);
+
+int hello_init(void)
+{
+  printk(KERN_INFO "Hello World!\n");
+  return 0;
+}
+
+void hello_exit(void)
+{
+  printk(KERN_INFO "Bye World!\n");
+}
+
+module_init(hello_init);
+module_exit(hello_exit);
+
+MODULE_LICENSE("GPL");
diff --git a/tests/data/test-read-ctf/test-linux-module.ko b/tests/data/test-read-ctf/test-linux-module.ko
new file mode 100644
index 0000000000000000000000000000000000000000..c37d6e90511e7c497a5345bfbe4b03f29ed04710
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HcmV?d00001

diff --git a/tests/test-read-ctf.cc b/tests/test-read-ctf.cc
index 994610b8..b0ef7de6 100644
--- a/tests/test-read-ctf.cc
+++ b/tests/test-read-ctf.cc
@@ -293,6 +293,15 @@  static InOutSpec in_out_specs[] =
     "data/test-read-ctf/test-callback2.abi",
     "output/test-read-ctf/test-callback2.abi",
   },
+  // out-of-tree kernel module.
+  {
+    "data/test-read-ctf/test-linux-module.ko",
+    "",
+    "",
+    SEQUENCE_TYPE_ID_STYLE,
+    "data/test-read-ctf/test-linux-module.abi",
+    "output/test-read-ctf/test-linux-module.abi",
+  },
   // This should be the last entry.
   {NULL, NULL, NULL, SEQUENCE_TYPE_ID_STYLE, NULL, NULL}
 };