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authorLinus Torvalds <torvalds@linux-foundation.org>2016-08-04 18:04:44 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2016-08-04 18:04:44 -0400
commit8e7106a60748e74f4c76b2204e83f14e4dc041cc (patch)
tree99dee14b06b1d01dc1da4325c8b2fb613a5ebfae /arch
parentc1ece76719205690f4b448460d9b85c130e8021b (diff)
parent002d2f01f13f1671d771e1493a3405ed4986694d (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu
Pull m68knommu updates from Greg Ungerer: "This series is all about Nicolas flat format support for MMU systems. Traditional m68k no-MMU flat format binaries can now be run on m68k MMU enabled systems too. The series includes some nice cleanups of the binfmt_flat code and converts it to using proper user space accessor functions. With all this in place you can boot and run a complete no-MMU flat format based user space on an MMU enabled system" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gerg/m68knommu: m68k: enable binfmt_flat on systems with an MMU binfmt_flat: allow compressed flat binary format to work on MMU systems binfmt_flat: add MMU-specific support binfmt_flat: update libraries' data segment pointer with userspace accessors binfmt_flat: use clear_user() rather than memset() to clear .bss binfmt_flat: use proper user space accessors with old relocs code binfmt_flat: use proper user space accessors with relocs processing code binfmt_flat: clean up create_flat_tables() and stack accesses binfmt_flat: use generic transfer_args_to_stack() elf_fdpic_transfer_args_to_stack(): make it generic binfmt_flat: prevent kernel dammage from corrupted executable headers binfmt_flat: convert printk invocations to their modern form binfmt_flat: assorted cleanups m68k: use same start_thread() on MMU and no-MMU m68k: fix file path comment m68k: fix bFLT executable running on MMU enabled systems
Diffstat (limited to 'arch')
-rw-r--r--arch/m68k/include/asm/flat.h13
-rw-r--r--arch/m68k/include/asm/processor.h15
2 files changed, 11 insertions, 17 deletions
diff --git a/arch/m68k/include/asm/flat.h b/arch/m68k/include/asm/flat.h
index f9454b89a51b..00c392b0cabd 100644
--- a/arch/m68k/include/asm/flat.h
+++ b/arch/m68k/include/asm/flat.h
@@ -1,5 +1,5 @@
/*
- * include/asm-m68knommu/flat.h -- uClinux flat-format executables
+ * flat.h -- uClinux flat-format executables
*/
#ifndef __M68KNOMMU_FLAT_H__
@@ -8,8 +8,9 @@
#define flat_argvp_envp_on_stack() 1
#define flat_old_ram_flag(flags) (flags)
#define flat_reloc_valid(reloc, size) ((reloc) <= (size))
-#define flat_get_addr_from_rp(rp, relval, flags, p) get_unaligned(rp)
-#define flat_put_addr_at_rp(rp, val, relval) put_unaligned(val,rp)
+#define flat_get_addr_from_rp(rp, relval, flags, p) \
+ ({ unsigned long __val; __get_user_unaligned(__val, rp); __val; })
+#define flat_put_addr_at_rp(rp, val, relval) __put_user_unaligned(val, rp)
#define flat_get_relocate_addr(rel) (rel)
static inline int flat_set_persistent(unsigned long relval,
@@ -18,4 +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 a6ce2ec8d693..c84a2183b3f0 100644
--- a/arch/m68k/include/asm/processor.h
+++ b/arch/m68k/include/asm/processor.h
@@ -110,7 +110,6 @@ struct thread_struct {
#define setframeformat(_regs) do { } while (0)
#endif
-#ifdef CONFIG_MMU
/*
* Do necessary setup to start up a newly executed thread.
*/
@@ -123,26 +122,14 @@ static inline void start_thread(struct pt_regs * regs, unsigned long pc,
wrusp(usp);
}
+#ifdef CONFIG_MMU
extern int handle_kernel_fault(struct pt_regs *regs);
-
#else
-
-#define start_thread(_regs, _pc, _usp) \
-do { \
- (_regs)->pc = (_pc); \
- setframeformat(_regs); \
- if (current->mm) \
- (_regs)->d5 = current->mm->start_data; \
- (_regs)->sr &= ~0x2000; \
- wrusp(_usp); \
-} while(0)
-
static inline int handle_kernel_fault(struct pt_regs *regs)
{
/* Any fault in kernel is fatal on non-mmu */
return 0;
}
-
#endif
/* Forward declaration, a strange C thing */