|author||Waldemar Brodkorb <email@example.com>||2016-08-17 08:37:54 +0200|
|committer||Thomas Petazzoni <firstname.lastname@example.org>||2016-08-23 00:05:37 +0200|
m68k: flat one memory region works with small kernel patch
Greg Ungerer fixed recently a bug in the Linux kernel, which allows to use one memory region again. Signed-off-by: Waldemar Brodkorb <email@example.com> [Thomas: cherry-picked from next to master, in order to be able to use BR2_BINFMT_FLAT_ONE by default on m68k, since BR2_BINFMT_FLAT_SEP_DATA causes too much problems.] Signed-off-by: Peter Korsgaard <firstname.lastname@example.org>
Diffstat (limited to 'board')
1 files changed, 45 insertions, 0 deletions
diff --git a/board/qemu/m68k-mcf5208/patches/linux/m68knommu-fix-signal.patch b/board/qemu/m68k-mcf5208/patches/linux/m68knommu-fix-signal.patch
new file mode 100644
@@ -0,0 +1,45 @@
+m68knommu: fix user a5 register being overwritten
+On no-MMU systems the application a5 register can be overwitten with the
+address of the process data segment when processing application signals.
+For flat format applications compiled with full absolute relocation this
+effectively corrupts the a5 register on signal processing - and this very
+quickly leads to process crash and often takes out the whole system with
+a panic as well.
+This has no effect on flat format applications compiled with the more
+common PIC methods (such as -msep-data). These format applications reserve
+a5 for the pointer to the data segment anyway - so it doesn't change it.
+A long time ago the a5 register was used in the code packed into the user
+stack to enable signal return processing. And so it had to be restored on
+end of signal cleanup processing back to the original a5 user value. This
+was historically done by saving away a5 in the sigcontext structure. At
+some point (a long time back it seems) the a5 restore process was changed
+and it was hard coded to put the user data segment address directly into a5.
+Which is ok for the common PIC compiled application case, but breaks the
+full relocation application code.
+We no longer use this type of signal handling mechanism and so we don't
+need to do anything special to save and restore a5 at all now. So remove the
+code that hard codes a5 to the address of the user data segment.
+Signed-off-by: Greg Ungerer <email@example.com>
+ arch/m68k/kernel/signal.c | 1 -
+ 1 file changed, 1 deletion(-)
+diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
+index 2dcee3a..9202f82 100644
+@@ -213,7 +213,6 @@ static inline int frame_extra_sizes(int f)
+ static inline void adjustformat(struct pt_regs *regs)
+- ((struct switch_stack *)regs - 1)->a5 = current->mm->start_data;
+ * set format byte to make stack appear modulo 4, which it will
+ * be when doing the rte