The vdsocheck tool validates the object files and final .so library.
It can detect if the compiler created relocations which are incompatible
with the vDSO which need to be worked around.

Wire it up for the architecture.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
---
 arch/mips/Kconfig           |  1 +
 arch/mips/vdso/Makefile     |  8 ++++----
 lib/vdso/check/vdsocheck.rs | 15 +++++++++++++++
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index e2eb9627bd14..9a3ce550c95d 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -107,6 +107,7 @@ config MIPS
 	select TRACE_IRQFLAGS_SUPPORT
 	select ARCH_HAS_ELFCORE_COMPAT
 	select HAVE_ARCH_KCSAN if 64BIT
+	select VDSO_CHECK
 
 config MIPS_FIXUP_BIGPHYS_ADDR
 	bool
diff --git a/arch/mips/vdso/Makefile b/arch/mips/vdso/Makefile
index 00d3ba2c482a..63060057cd21 100644
--- a/arch/mips/vdso/Makefile
+++ b/arch/mips/vdso/Makefile
@@ -66,7 +66,7 @@ quiet_cmd_vdso_mips_check = VDSOCHK $@
 #
 
 quiet_cmd_vdsold_and_vdso_check = LD      $@
-      cmd_vdsold_and_vdso_check = $(cmd_ld); $(cmd_vdso_check); $(cmd_vdso_mips_check)
+      cmd_vdsold_and_vdso_check = $(cmd_ld_vdso); $(cmd_vdso_check); $(cmd_vdso_mips_check)
 
 quiet_cmd_vdsoas_o_S = AS      $@
       cmd_vdsoas_o_S = $(CC) $(a_flags) -c -o $@ $<
@@ -103,7 +103,7 @@ $(obj-vdso): KBUILD_AFLAGS := $(aflags-vdso) $(native-abi)
 
 $(obj)/vdso.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) $(native-abi)
 
-$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) FORCE
+$(obj)/vdso.so.dbg.raw: $(obj)/vdso.lds $(obj-vdso) $(vdsocheck) FORCE
 	$(call if_changed,vdsold_and_vdso_check)
 
 $(obj)/vdso-image.c: $(obj)/vdso.so.dbg.raw $(obj)/vdso.so.raw \
@@ -141,7 +141,7 @@ $(obj)/vdso-o32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=32
 $(obj)/vdso-o32.lds: $(src)/vdso.lds.S FORCE
 	$(call if_changed_dep,cpp_lds_S)
 
-$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) FORCE
+$(obj)/vdso-o32.so.dbg.raw: $(obj)/vdso-o32.lds $(obj-vdso-o32) $(vdsocheck) FORCE
 	$(call if_changed,vdsold_and_vdso_check)
 
 $(obj)/vdso-o32-image.c: VDSO_NAME := o32
@@ -181,7 +181,7 @@ $(obj)/vdso-n32.lds: KBUILD_CPPFLAGS := $(ccflags-vdso) -mabi=n32
 $(obj)/vdso-n32.lds: $(src)/vdso.lds.S FORCE
 	$(call if_changed_dep,cpp_lds_S)
 
-$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) FORCE
+$(obj)/vdso-n32.so.dbg.raw: $(obj)/vdso-n32.lds $(obj-vdso-n32) $(vdsocheck) FORCE
 	$(call if_changed,vdsold_and_vdso_check)
 
 $(obj)/vdso-n32-image.c: VDSO_NAME := n32
diff --git a/lib/vdso/check/vdsocheck.rs b/lib/vdso/check/vdsocheck.rs
index b2135cf9add3..865e8cf7d4e1 100644
--- a/lib/vdso/check/vdsocheck.rs
+++ b/lib/vdso/check/vdsocheck.rs
@@ -157,6 +157,21 @@ fn allowed_relocations_for_machine(machine: u16) -> Option<AllowedRelocations<'s
             ..Default::default()
         }
         .into(),
+        bindings::EM_MIPS => AllowedRelocations {
+            ignored_object_file_sections: &[".rel.pdr", ".rela.pdr"],
+            in_object_file: &[
+                bindings::R_MIPS_PC16,
+                bindings::R_MIPS_PC21_S2,
+                bindings::R_MIPS_PC26_S2,
+                bindings::R_MIPS_PC18_S3,
+                bindings::R_MIPS_PC19_S2,
+                bindings::R_MIPS_PCHI16,
+                bindings::R_MIPS_PCLO16,
+                bindings::R_MIPS_PC32,
+            ],
+            ..Default::default()
+        }
+        .into(),
         _ => None,
     }
 }

-- 
2.55.0