objtool: Validate disassembler headers in libopcodes probegrafted

commit 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries")
tested for libopcodes availability by linking a test snippet with a forward
declaration of disassemble_init_for_target().

However, testing symbol linkage with an extern declaration only verifies
the presence of the library (.so/.a) and bypasses checking for development
headers (binutils-dev). On systems where libopcodes is present without
development headers installed, the probe succeeds, enabling BUILD_DISAS.
Subsequent compilation of objtool then fails:

  fatal error: 'bfd.h' file not found
    113 | #include <bfd.h>

Additionally, the probe invokes $(HOSTCC) without $(HOSTCFLAGS), ignoring
any sysroot or include flags specified for the host compiler.

Fix this by including <bfd.h> and <dis-asm.h> directly in the test snippet,
passing $(HOSTCFLAGS) so host compiler options are respected, and defining
PACKAGE="objtool" to satisfy the configuration check in <bfd.h>.

Fixes: 3f2de814c059 ("objtool: Fix libopcodes linking with static libraries")
Fixes: 436326bc525d ("objtool: fix build failure due to missing libopcodes check")
Reported-by: Alice Ryhl <aliceryhl@google.com>
Assisted-by: Antigravity:Gemini-Next
Signed-off-by: Ulises Mendez Martinez <umendez@google.com>
Link: https://patch.msgid.link/20260904150710.2997558-1-umendez@google.com
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

1 files changed, 75 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-driver-ppi b/Documentation/ABI/testing/sysfs-driver-ppi
new file mode 100644
index 000000000..1a56fc507
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-driver-ppi
@@ -0,0 +1,75 @@
+What:		/sys/class/tpm/tpmX/ppi/
+Date:		August 2012
+KernelVersion:	3.6
+Contact:	xiaoyan.zhang@intel.com
+Description:
+		This folder includes the attributes related with PPI (Physical
+		Presence Interface). Only if TPM is supported by BIOS, this
+		folder makes sense. The folder path can be got by command
+		'find /sys/ -name 'pcrs''. For the detail information of PPI,
+		please refer to the PPI specification from
+
+		http://www.trustedcomputinggroup.org/
+
+		In Linux 4.2 ppi was moved to the character device directory.
+		A symlink from tpmX/device/ppi to tpmX/ppi to provide backwards
+		compatibility.
+
+What:		/sys/class/tpm/tpmX/ppi/version
+Date:		August 2012
+Contact:	xiaoyan.zhang@intel.com
+Description:
+		This attribute shows the version of the PPI supported by the
+		platform.
+		This file is readonly.
+
+What:		/sys/class/tpm/tpmX/ppi/request
+Date:		August 2012
+Contact:	xiaoyan.zhang@intel.com
+Description:
+		This attribute shows the request for an operation to be
+		executed in the pre-OS environment. It is the only input from
+		the OS to the pre-OS environment. The request should be an
+		integer value range from 1 to 160, and 0 means no request.
+		This file can be read and written.
+
+What:		/sys/class/tpm/tpmX/ppi/response
+Date:		August 2012
+Contact:	xiaoyan.zhang@intel.com
+Description:
+		This attribute shows the response to the most recent operation
+		request it acted upon. The format is "<request> <response num>
+		: <response description>".
+		This file is readonly.
+
+What:		/sys/class/tpm/tpmX/ppi/transition_action
+Date:		August 2012
+Contact:	xiaoyan.zhang@intel.com
+Description:
+		This attribute shows the platform-specific action that should
+		take place in order to transition to the BIOS for execution of
+		a requested operation. The format is "<action num>: <action
+		description>".
+		This file is readonly.
+
+What:		/sys/class/tpm/tpmX/ppi/tcg_operations
+Date:		August 2012
+Contact:	xiaoyan.zhang@intel.com
+Description:
+		This attribute shows whether it is allowed to request an
+		operation to be executed in the pre-OS environment by the BIOS
+		for the requests defined by TCG, i.e. requests from 1 to 22.
+		The format is "<request> <status num>: <status description>".
+		This attribute is only supported by PPI version 1.2+.
+		This file is readonly.
+
+What:		/sys/class/tpm/tpmX/ppi/vs_operations
+Date:		August 2012
+Contact:	xiaoyan.zhang@intel.com
+Description:
+		This attribute shows whether it is allowed to request an
+		operation to be executed in the pre-OS environment by the BIOS
+		for the verdor specific requests, i.e. requests from 128 to
+		255. The format is same with tcg_operations. This attribute
+		is also only supported by PPI version 1.2+.
+		This file is readonly.