Hi Nicolas,
On 21/07/16 05:22, Nicolas Pitre wrote:
> This series provides the necessary changes to allow "flat" executable
> binaries meant for no-MMU systems to actually run on systems with a MMU.
> Also thrown in are various cleanups to binfmt_flat.c.
I got to the bottom of why I couldn't run m68k flat binaries on
an MMU enabled m68k system. I had to fix the regs setup, with the
patch below. With this I can now run flat binaries on my ColdFire
MMU enabled system.
This change is completely independent of your patch series so I'll
push this separately via the linux-m68k list and my m68knommu git
tree.
Regards
Greg
Subject: [PATCH] m68k: fix bFLT executable running on MMU enabled systems
Even after recent changes to support running flat format executables on
MMU enabled systems (by nicolas.pi...@linaro.org) they still failed to
run on m68k/ColdFire MMU enabled systems. On trying to run a flat format
binary the application would immediately crash with a SIGSEGV.
Code to setup the D5 register with the base of the application data
region was only in the non-MMU code path, so it was not being set for
the MMU enabled case. Flat binaries on m68k/ColdFire use this to support
GOT/PIC flat built application code.
Fix this so that D5 is always setup when loading/running a bFLT executable
on m68k systems.
Signed-off-by: Greg Ungerer <g...@linux-m68k.org>
---
arch/m68k/include/asm/flat.h | 6 ++++++
arch/m68k/include/asm/processor.h | 2 --
2 files changed, 6 insertions(+), 2 deletions(-)
diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index f3f592d..a97c479 100644
--- a/arch/m68k/include/asm/flat.h
+++ b/arch/m68k/include/asm/flat.h
@@ -19,4 +19,10 @@ static inline int flat_set_persistent(unsigned long relval,
return 0;
}
+#define FLAT_PLAT_INIT(regs) \
+ do { \
+ if (current->mm) \
+ (regs)->d5 = current->mm->start_data; \
+ } while (0)
+
#endif /* __M68KNOMMU_FLAT_H__ */
diff --git a/arch/m68k/include/asm/processor.h
b/arch/m68k/include/asm/processor.h
index a6ce2ec..46672d1 100644
--- a/arch/m68k/include/asm/processor.h
+++ b/arch/m68k/include/asm/processor.h
@@ -131,8 +131,6 @@ extern int handle_kernel_fault(struct pt_regs *regs);
do { \
(_regs)->pc = (_pc); \
setframeformat(_regs); \
- if (current->mm) \
- (_regs)->d5 = current->mm->start_data; \
(_regs)->sr &= ~0x2000; \
wrusp(_usp); \
} while(0)
--
1.9.1
