[PATCH]: linux-2.5.42uc1 (MMU-less support)

[PATCH]: linux-2.5.42uc1 (MMU-less support)

[Greg Ungerer]

Hi All,

An updated uClinux patch is available at:

http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.42uc1.patch.gz

Changelog:

1. v850 update
2. cleaned up mm/page_alloc.c


Smaller specific patches:

. FEC ColdFire 5272 ethernet driver
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.42uc1-fec.patch.gz

. m68k/ColdFire/v850 serial drivers
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.42uc1-serial.patch.gz

. 68328 frame buffer
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.42uc1-fb.patch.gz

. binfmt_flat loader
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.42uc1-binflat.patch.gz

. m68knommu architecture
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.42uc1-m68knommu.patch.gz

. v850 architecture
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.42uc1-v850.patch.gz

. mm (MMU-less) only patch
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.42uc1-mm.patch.gz

Regards
Greg


------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Wizard        EMAIL:  gerg@snapgear.com
Snapgear Pty Ltd                               PHONE:    +61 7 3279 1822
825 Stanley St,                                  FAX:    +61 7 3279 1820
Woolloongabba, QLD, 4102, Australia              WEB:   www.SnapGear.com

Re: [PATCH]: linux-2.5.42uc1 (MMU-less support)

[Christoph Hellwig]

On Wed, Oct 16, 2002 at 01:25:49AM +1000, Greg Ungerer wrote:
> Hi All,
> 
> An updated uClinux patch is available at:
> 
> http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.42uc1.patch.gz
> 
> Changelog:
> 
> 1. v850 update

There are a bunch of CVS .#* files left from this one.
v850_defs.h wants updating to the generic generate-asm-offsets.h
mechanism (check the toplevel Makefile)
Please stop the ugly symlink hell with the linker scripts -
we have vmlinux.lds.S for that.
it should read something like:

#include <linux/config.h>
#ifdef BOARD1
#include "board1.lds"
#else
...
#endif

for v850

Could you please explain the rootfs hacks in v850?
I don't think we want those in mainline but rather generic
initrd/initramfs.

Also please remove arch/v850/sim/* - that stuff doesn't
belong into the kernel tree.

> 2. cleaned up mm/page_alloc.c

Why do you put set_page_refs into a header?  Separating it out
looks good to me, but IMHO it should stay in page_alloc.c.
BTW, are you sure that you don't need to set the refs in the
other caller of prep_new_page?  To me it looks like you should
and then you could merge it into prep_new_page.

Also, what is CONFIG_CONTIGUOUS_PAGE_ALLOC doing?  It seems not
fully implemented but adds lots of uglieness :)
CONFIG_NO_MMU_LARGE_ALLOCS might want a saner name, btw
(CONFIG_LARGE_ALLOCS?).

General commets:
- Config.in files have three-space, not two-space indentation
- I don't think you want to keep around the old binfmt_flat
  format when merghin into mainline
- MAX_SHARED_LIBS is never used

Re: [PATCH]: linux-2.5.42uc1 (MMU-less support)

[Miles Bader]

[-- Attachment #1: Type: text/plain, Size: 578 bytes --]

Hi,

Here's a v850 update for 2.5.42uc1.

I addressed two of Christoph Hellwig's concerns, (1) vmlinux.lds.S
[barf] and (2) the asm-constant generation mechanism.

He also complained about using the MD driver &c instead of initrd, but
I'm not sure what do about that -- it'd be nice to use a `standard'
solution, but when I originally looked at the initrd stuff, it seemed
very convoluted and confusing; since earlier lkml discussion had pointed
to using MD as the nearest thing to the old blkmem device, that seemed
like the way to go.

What's your opinion on this?


Patch:



[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
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[-- Type: text/x-patch, Size: 10759 bytes --]

diff -ruN -X../cludes ../orig/linux-2.5.42uc1/arch/v850/Makefile arch/v850/Makefile
--- ../orig/linux-2.5.42uc1/arch/v850/Makefile	2002-10-16 10:45:53.000000000 +0900
+++ arch/v850/Makefile	2002-10-16 13:46:51.000000000 +0900
@@ -23,32 +23,6 @@
 CFLAGS += -D__linux__ -DUTS_SYSNAME=\"uClinux\"
 
 
-# linker scripts
-ifdef CONFIG_V850E_SIM
-LINKER_SCRIPT = $(arch_dir)/sim.ld
-endif
-ifdef CONFIG_V850E2_SIM85E2C
-LINKER_SCRIPT = $(arch_dir)/sim85e2c.ld
-endif
-ifdef CONFIG_V850E2_FPGA85E2C
-LINKER_SCRIPT = $(arch_dir)/fpga85e2c.ld
-endif
-ifdef CONFIG_V850E2_ANNA
-LINKER_SCRIPT = $(arch_dir)/anna.ld
-endif
-ifdef CONFIG_RTE_CB_MA1
-ifdef CONFIG_ROM_KERNEL
-LINKER_SCRIPT = $(arch_dir)/rte_ma1_cb-rom.ld
-else
-ifdef CONFIG_RTE_CB_MA1_KSRAM
-LINKER_SCRIPT = $(arch_dir)/rte_ma1_cb-ksram.ld
-else
-LINKER_SCRIPT = $(arch_dir)/rte_ma1_cb.ld
-endif
-endif
-endif
-
-
 HEAD := $(arch_dir)/kernel/head.o $(arch_dir)/kernel/init_task.o
 core-y += $(arch_dir)/kernel/
 libs-y += $(arch_dir)/lib/
@@ -73,17 +47,19 @@
 endif
 
 
-# Barf.
-$(arch_dir)/vmlinux.lds.S: $(LINKER_SCRIPT)
-	cp $< $@
-
-
-archmrproper:
-
-archdep:
+prepare: include/asm-$(ARCH)/asm-consts.h
 
-archclean:
-	rm -f vmlinux
-	rm -f root_fs_image.o
-	rm -f $(arch_dir)/kernel/v850_defs.h $(arch_dir)/kernel/v850_defs.d
-	rm -f $(arch_dir)/vmlinux.lds.S $(arch_dir)/vmlinux.lds.s
+# Generate constants from C code for use by asm files
+arch/$(ARCH)/kernel/asm-consts.s: include/asm include/linux/version.h \
+				   include/config/MARKER
+include/asm-$(ARCH)/asm-consts.h.tmp: arch/$(ARCH)/kernel/asm-consts.s
+	@$(generate-asm-offsets.h) < $< > $@
+include/asm-$(ARCH)/asm-consts.h: include/asm-$(ARCH)/asm-consts.h.tmp
+	@echo -n '  Generating $@'
+	@$(update-if-changed)
+
+
+CLEAN_FILES += include/asm-$(ARCH)/asm-consts.h.tmp \
+	       include/asm-$(ARCH)/asm-consts.h \
+	       arch/$(ARCH)/kernel/asm-consts.s \
+	       root_fs_image.o
diff -ruN -X../cludes ../orig/linux-2.5.42uc1/arch/v850/kernel/Makefile arch/v850/kernel/Makefile
--- ../orig/linux-2.5.42uc1/arch/v850/kernel/Makefile	2002-10-16 10:45:54.000000000 +0900
+++ arch/v850/kernel/Makefile	2002-10-16 13:47:05.000000000 +0900
@@ -36,17 +36,3 @@
 
 
 include $(TOPDIR)/Rules.make
-
-
-$(obj)/head.o: $(src)/head.S $(obj)/v850_defs.h
-$(obj)/entry.o: $(src)/entry.S $(obj)/v850_defs.h
-
--include $(obj)/v850_defs.d
-
-$(obj)/v850_defs.h: $(src)/v850_defs.c $(src)/v850_defs.head
-	rm -f $(obj)/v850_defs.d
-	SUNPRO_DEPENDENCIES="$(obj)/v850_defs.d $(obj)/v850_defs.h" \
-	$(CC) $(filter-out -MD,$(CFLAGS)) -S -o $(obj)/v850_defs.s $(src)/v850_defs.c
-	cp $(src)/v850_defs.head $(src)/v850_defs.h
-	grep '^#define' $(obj)/v850_defs.s >> $(obj)/v850_defs.h
-	rm $(obj)/v850_defs.s
diff -ruN -X../cludes ../orig/linux-2.5.42uc1/arch/v850/kernel/asm-consts.c arch/v850/kernel/asm-consts.c
--- ../orig/linux-2.5.42uc1/arch/v850/kernel/asm-consts.c	1970-01-01 09:00:00.000000000 +0900
+++ arch/v850/kernel/asm-consts.c	2002-10-16 13:51:15.000000000 +0900
@@ -0,0 +1,60 @@
+/*
+ * This program is used to generate definitions needed by
+ * assembly language modules.
+ *
+ * We use the technique used in the OSF Mach kernel code:
+ * generate asm statements containing #defines,
+ * compile this file to assembler, and then extract the
+ * #defines from the assembly-language output.
+ */
+
+#include <linux/stddef.h>
+#include <linux/sched.h>
+#include <linux/kernel_stat.h>
+#include <asm/irq.h>
+#include <asm/hardirq.h>
+#include <asm/errno.h>
+
+#define DEFINE(sym, val) \
+	asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define BLANK() asm volatile("\n->" : : )
+
+int main (void)
+{
+	/* offsets into the task struct */
+	DEFINE (TASK_STATE, offsetof (struct task_struct, state));
+	DEFINE (TASK_FLAGS, offsetof (struct task_struct, flags));
+	DEFINE (TASK_PTRACE, offsetof (struct task_struct, ptrace));
+	DEFINE (TASK_BLOCKED, offsetof (struct task_struct, blocked));
+	DEFINE (TASK_THREAD, offsetof (struct task_struct, thread));
+	DEFINE (TASK_THREAD_INFO, offsetof (struct task_struct, thread_info));
+	DEFINE (TASK_MM, offsetof (struct task_struct, mm));
+	DEFINE (TASK_ACTIVE_MM, offsetof (struct task_struct, active_mm));
+	DEFINE (TASK_PID, offsetof (struct task_struct, pid));
+
+	/* offsets into the kernel_stat struct */
+	DEFINE (STAT_IRQ, offsetof (struct kernel_stat, irqs));
+
+
+	/* signal defines */
+	DEFINE (SIGSEGV, SIGSEGV);
+	DEFINE (SEGV_MAPERR, SEGV_MAPERR);
+	DEFINE (SIGTRAP, SIGTRAP);
+	DEFINE (SIGCHLD, SIGCHLD);
+	DEFINE (SIGILL, SIGILL);
+	DEFINE (TRAP_TRACE, TRAP_TRACE);
+
+	/* ptrace flag bits */
+	DEFINE (PT_PTRACED, PT_PTRACED);
+	DEFINE (PT_DTRACE, PT_DTRACE);
+
+	/* error values */
+	DEFINE (ENOSYS, ENOSYS);
+
+	/* clone flag bits */
+	DEFINE (CLONE_VFORK, CLONE_VFORK);
+	DEFINE (CLONE_VM, CLONE_VM);
+
+	return 0;
+}
diff -ruN -X../cludes ../orig/linux-2.5.42uc1/arch/v850/kernel/entry.S arch/v850/kernel/entry.S
--- ../orig/linux-2.5.42uc1/arch/v850/kernel/entry.S	2002-10-16 10:45:54.000000000 +0900
+++ arch/v850/kernel/entry.S	2002-10-16 13:44:55.000000000 +0900
@@ -22,7 +22,7 @@
 #include <asm/irq.h>
 #include <asm/errno.h>
 
-#include "v850_defs.h"
+#include <asm/asm-consts.h>
 
 
 /* Make a slightly more convenient alias for C_SYMBOL_NAME.  */
diff -ruN -X../cludes ../orig/linux-2.5.42uc1/arch/v850/kernel/v850_defs.c arch/v850/kernel/v850_defs.c
--- ../orig/linux-2.5.42uc1/arch/v850/kernel/v850_defs.c	2002-10-16 10:45:54.000000000 +0900
+++ arch/v850/kernel/v850_defs.c	1970-01-01 09:00:00.000000000 +0900
@@ -1,58 +0,0 @@
-/*
- * This program is used to generate definitions needed by
- * assembly language modules.
- *
- * We use the technique used in the OSF Mach kernel code:
- * generate asm statements containing #defines,
- * compile this file to assembler, and then extract the
- * #defines from the assembly-language output.
- */
-
-#include <linux/stddef.h>
-#include <linux/sched.h>
-#include <linux/kernel_stat.h>
-#include <asm/irq.h>
-#include <asm/hardirq.h>
-#include <asm/errno.h>
-
-#define DEFINE(sym, val) \
-	asm volatile ("\n#define " #sym " %0" : : "i" (val))
-
-int main (void)
-{
-	/* offsets into the task struct */
-	DEFINE (TASK_STATE, offsetof (struct task_struct, state));
-	DEFINE (TASK_FLAGS, offsetof (struct task_struct, flags));
-	DEFINE (TASK_PTRACE, offsetof (struct task_struct, ptrace));
-	DEFINE (TASK_BLOCKED, offsetof (struct task_struct, blocked));
-	DEFINE (TASK_THREAD, offsetof (struct task_struct, thread));
-	DEFINE (TASK_THREAD_INFO, offsetof (struct task_struct, thread_info));
-	DEFINE (TASK_MM, offsetof (struct task_struct, mm));
-	DEFINE (TASK_ACTIVE_MM, offsetof (struct task_struct, active_mm));
-	DEFINE (TASK_PID, offsetof (struct task_struct, pid));
-
-	/* offsets into the kernel_stat struct */
-	DEFINE (STAT_IRQ, offsetof (struct kernel_stat, irqs));
-
-
-	/* signal defines */
-	DEFINE (SIGSEGV, SIGSEGV);
-	DEFINE (SEGV_MAPERR, SEGV_MAPERR);
-	DEFINE (SIGTRAP, SIGTRAP);
-	DEFINE (SIGCHLD, SIGCHLD);
-	DEFINE (SIGILL, SIGILL);
-	DEFINE (TRAP_TRACE, TRAP_TRACE);
-
-	/* ptrace flag bits */
-	DEFINE (PT_PTRACED, PT_PTRACED);
-	DEFINE (PT_DTRACE, PT_DTRACE);
-
-	/* error values */
-	DEFINE (ENOSYS, ENOSYS);
-
-	/* clone flag bits */
-	DEFINE (CLONE_VFORK, CLONE_VFORK);
-	DEFINE (CLONE_VM, CLONE_VM);
-
-	return 0;
-}
diff -ruN -X../cludes ../orig/linux-2.5.42uc1/arch/v850/kernel/v850_defs.head arch/v850/kernel/v850_defs.head
--- ../orig/linux-2.5.42uc1/arch/v850/kernel/v850_defs.head	2002-10-16 10:45:54.000000000 +0900
+++ arch/v850/kernel/v850_defs.head	1970-01-01 09:00:00.000000000 +0900
@@ -1,5 +0,0 @@
-/*
- * WARNING! This file is automatically generated - DO NOT EDIT!
- */
-
-#define TS_MAGICKEY	0x5a5a5a5a
diff -ruN -X../cludes ../orig/linux-2.5.42uc1/arch/v850/vmlinux.lds.S arch/v850/vmlinux.lds.S
--- ../orig/linux-2.5.42uc1/arch/v850/vmlinux.lds.S	1970-01-01 09:00:00.000000000 +0900
+++ arch/v850/vmlinux.lds.S	2002-10-16 13:30:43.000000000 +0900
@@ -0,0 +1,27 @@
+#include <linux/config.h>
+
+#ifdef CONFIG_V850E_SIM
+#include "sim.ld"
+#endif
+
+#ifdef CONFIG_V850E2_SIM85E2C
+#include "sim85e2c.ld"
+#endif
+
+#ifdef CONFIG_V850E2_FPGA85E2C
+#include "fpga85e2c.ld"
+#endif
+
+#ifdef CONFIG_V850E2_ANNA
+#include "anna.ld"
+#endif
+
+#ifdef CONFIG_RTE_CB_MA1
+# ifdef CONFIG_ROM_KERNEL
+#  include "rte_ma1_cb-rom.ld"
+# elif CONFIG_RTE_CB_MA1_KSRAM
+#  include "rte_ma1_cb-ksram.ld"
+# else /* !CONFIG_ROM_KERNEL && !CONFIG_RTE_CB_MA1_KSRAM */
+#  include "rte_ma1_cb.ld"
+# endif /* CONFIG_ROM_KERNEL */
+#endif /* CONFIG_RTE_CB_MA1 */
diff -ruN -X../cludes ../orig/linux-2.5.42uc1/include/asm-v850/page.h include/asm-v850/page.h
--- ../orig/linux-2.5.42uc1/include/asm-v850/page.h	2002-10-16 10:45:57.000000000 +0900
+++ include/asm-v850/page.h	2002-10-16 11:53:42.000000000 +0900
@@ -21,6 +21,7 @@
 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
 #define PAGE_MASK       (~(PAGE_SIZE-1))
 
+
 /*
  * PAGE_OFFSET -- the first address of the first page of memory. For archs with
  * no MMU this corresponds to the first free page in physical memory (aligned
@@ -30,11 +31,6 @@
 #define PAGE_OFFSET  0x0000000
 #endif
 
-/*
- * MAP_NR -- given an address, calculate the index of the page struct which
- * points to the address's page.
- */
-#define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT)
 
 #ifdef __KERNEL__
 #ifndef __ASSEMBLY__
@@ -91,9 +87,11 @@
 
 #endif /* !__ASSEMBLY__ */
 
+
 /* to align the pointer to the (next) page boundary */
 #define PAGE_ALIGN(addr)	(((addr) + PAGE_SIZE - 1) & PAGE_MASK)
 
+
 #ifndef __ASSEMBLY__
 
 extern void __bug (void) __attribute__ ((noreturn));
@@ -116,18 +114,31 @@
 
 #endif /* !__ASSEMBLY__ */
 
-#define __pa(x)			__virt_to_phys ((unsigned long)(x))
-#define __va(x)			((void *)__phys_to_virt ((unsigned long)(x)))
 
 /* No current v850 processor has virtual memory.  */
 #define __virt_to_phys(addr)	(addr)
 #define __phys_to_virt(addr)	(addr)
 
-#define virt_to_page(kaddr) 	(mem_map + MAP_NR (kaddr))
+#define virt_to_pfn(kaddr)	(__virt_to_phys (kaddr) >> PAGE_SHIFT)
+#define pfn_to_virt(pfn)	__phys_to_virt ((pfn) << PAGE_SHIFT)
+
+#define MAP_NR(kaddr) \
+  (((unsigned long)(kaddr) - PAGE_OFFSET) >> PAGE_SHIFT)
+#define virt_to_page(kaddr)	(mem_map + MAP_NR (kaddr))
+#define page_to_virt(page) \
+  ((((page) - mem_map) << PAGE_SHIFT) + PAGE_OFFSET)
+
+#define pfn_to_page(pfn)	virt_to_page (pfn_to_virt (pfn))
+#define page_to_pfn(page)	virt_to_pfn (page_to_virt (page))
+
 #define	virt_addr_valid(kaddr)						\
   (((void *)(kaddr) >= (void *)PAGE_OFFSET) && MAP_NR (kaddr) < max_mapnr)
 
 
+#define __pa(x)		     __virt_to_phys ((unsigned long)(x))
+#define __va(x)		     ((void *)__phys_to_virt ((unsigned long)(x)))
+
+
 #endif /* KERNEL */
 
 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC

[-- Attachment #3: Type: text/plain, Size: 86 bytes --]



Thanks,

-Miles
-- 
Occam's razor split hairs so well, I bought the whole argument!

Re: [PATCH]: linux-2.5.42uc1 (MMU-less support)

[Greg Ungerer]

Hi Miles,

Miles Bader wrote:

> Here's a v850 update for 2.5.42uc1.


I have rolled this into, linux-2.5.43uc0.
I have also removed the gdb patches under arch/v850.


> I addressed two of Christoph Hellwig's concerns, (1) vmlinux.lds.S
> [barf] and (2) the asm-constant generation mechanism.
> 
> He also complained about using the MD driver &c instead of initrd, but
> I'm not sure what do about that -- it'd be nice to use a `standard'
> solution, but when I originally looked at the initrd stuff, it seemed
> very convoluted and confusing; since earlier lkml discussion had pointed
> to using MD as the nearest thing to the old blkmem device, that seemed
> like the way to go.


I very much like using a specific MTD map driver. I haven't carried
my initrd patches through to the 2.5 code yet. But it was pretty
simple to do for 2.4...

Regards
Greg


------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Wizard        EMAIL:  gerg@snapgear.com
SnapGear Pty Ltd                               PHONE:    +61 7 3435 2888
825 Stanley St,                                  FAX:    +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia              WEB:   www.SnapGear.com

Re: [PATCH]: linux-2.5.42uc1 (MMU-less support)

[Greg Ungerer]

Hi Christoph,

Christoph Hellwig wrote:

> There are a bunch of CVS .#* files left from this one.


Cleaned out now.


> v850_defs.h wants updating to the generic generate-asm-offsets.h
> mechanism (check the toplevel Makefile)


Miles cleaned this up.


> Please stop the ugly symlink hell with the linker scripts -
> we have vmlinux.lds.S for that.


Hmph. Hardly seems any better...


> Could you please explain the rootfs hacks in v850?
> I don't think we want those in mainline but rather generic
> initrd/initramfs.
> 
> Also please remove arch/v850/sim/* - that stuff doesn't
> belong into the kernel tree.


Done.



>>2. cleaned up mm/page_alloc.c
> 
> Why do you put set_page_refs into a header?


It looked might it might be usefull elsewhere.
(but currently isn't used for anything else).


> Separating it out
> looks good to me, but IMHO it should stay in page_alloc.c.
> BTW, are you sure that you don't need to set the refs in the
> other caller of prep_new_page?  To me it looks like you should
> and then you could merge it into prep_new_page.


No, you don't want that.


> Also, what is CONFIG_CONTIGUOUS_PAGE_ALLOC doing?  It seems not
> fully implemented but adds lots of uglieness :)


It was a second allocator that more cleverly allocated large
memory chunks - not using the power of 2 allocator. I have
not carried this into the 2.5 patches. Very nice to have,
since you suffer much more from memory fragmentation without
VM. But not strictly neccessary, and to minimize and simplify
the current patch sets I left it out.

Cleanup out all references to it now.


> CONFIG_NO_MMU_LARGE_ALLOCS might want a saner name, btw
> (CONFIG_LARGE_ALLOCS?).


Yes, no doubt the NO_MMU name is universally disliked :-)
Changed to COFNIG_LARGE_ALLOCS now.


> 
> General commets:
> - Config.in files have three-space, not two-space indentation



Fixed.


> - I don't think you want to keep around the old binfmt_flat


This isn't old. It is the primary format used on uClinux. ELF
and a.out are not practical, since you would need to do the final
link/locate on them at exec load time (you won't know what address
in memory they will get loaded to until them). You don have the
VM luxary of just locating it at a fixed address at compile time.

FLAT format is a light weight, mostly architecture independant
way to carry around relocs, and to keep the program binaries
small.


>   format when merghin into mainline
> - MAX_SHARED_LIBS is never used

Another "feature" I have not carried into 2.5. Removed.


Thanks
Greg





-- 
------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Wizard        EMAIL:  gerg@snapgear.com
SnapGear Pty Ltd                               PHONE:    +61 7 3435 2888
825 Stanley St,                                  FAX:    +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia              WEB:   www.SnapGear.com

Re: [PATCH]: linux-2.5.42uc1 (MMU-less support)

[Christoph Hellwig]

> This isn't old. It is the primary format used on uClinux. ELF
> and a.out are not practical, since you would need to do the final
> link/locate on them at exec load time (you won't know what address
> in memory they will get loaded to until them). You don have the
> VM luxary of just locating it at a fixed address at compile time.
> 
> FLAT format is a light weight, mostly architecture independant
> way to carry around relocs, and to keep the program binaries
> small.

I don't meant binfmt_flat itself but the support for the old-style relocs
that is still in the code.

BTW, does binfmt_flat for for any non-uClinux port?

Re: [PATCH]: linux-2.5.42uc1 (MMU-less support)

[Greg Ungerer]

Christoph Hellwig wrote:

>>This isn't old. It is the primary format used on uClinux. ELF
>>and a.out are not practical, since you would need to do the final
>>link/locate on them at exec load time (you won't know what address
>>in memory they will get loaded to until them). You don have the
>>VM luxary of just locating it at a fixed address at compile time.
>>
>>FLAT format is a light weight, mostly architecture independant
>>way to carry around relocs, and to keep the program binaries
>>small.
>>
> 
> I don't meant binfmt_flat itself but the support for the old-style relocs
> that is still in the code.


OK, I'll have a look at that.


> BTW, does binfmt_flat for for any non-uClinux port?


Don't beleive so.

Regards
Greg


------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Wizard        EMAIL:  gerg@snapgear.com
SnapGear Pty Ltd                               PHONE:    +61 7 3435 2888
825 Stanley St,                                  FAX:    +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia              WEB:   www.SnapGear.com

[PATCH]: linux-2.5.42uc1 (MMU-less support)

[Greg Ungerer]

Hi All,

An updated uClinux patch is available at:

http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.43uc0.patch.gz

Changelog:

1. patched against 2.5.43
2. removed v850 gdb stuff
3. change CONFIG_NO_MMU_LARGE_ALLOCS to CONFIG_LARGE_ALLOCS
4. remove unused CONFIG_CONTIGUOUS_PAGE_ALLOC code
5. reformated config.in files
6. removed unused MAX_SHARED_LIBS in flat.h
7. modified vmlinux.ld.S to include appropriate linker scripts
8. moved set_page_refs() back into page_alloc.c


Smaller specific patches:

. FEC ColdFire 5272 ethernet driver
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.43uc0-fec.patch.gz

. m68k/ColdFire/v850 serial drivers
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.43uc0-serial.patch.gz

. 68328 frame buffer
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.43uc0-fb.patch.gz

. binfmt_flat loader
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.43uc0-binflat.patch.gz

. m68knommu architecture
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.43uc0-m68knommu.patch.gz

. v850 architecture
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.43uc0-v850.patch.gz

. mm (MMU-less) only patch
http://www.uclinux.org/pub/uClinux/uClinux-2.5.x/linux-2.5.43uc0-mm.patch.gz

Regards
Greg


------------------------------------------------------------------------
Greg Ungerer  --  Chief Software Wizard        EMAIL:  gerg@snapgear.com
Snapgear Pty Ltd                               PHONE:    +61 7 3279 1822
825 Stanley St,                                  FAX:    +61 7 3279 1820
Woolloongabba, QLD, 4102, Australia              WEB:   www.SnapGear.com

[PATCH] Make some EXPORT_SYMBOLs dependent on CONFIG_MMU

[Miles Bader]

[-- Attachment #1: Type: text/plain, Size: 233 bytes --]

[I'm not sure who to send this to, so I'm guessing.  Pointers appreciated!]

Hi,

A few symbols are only defined when CONFIG_MMU=y, but are exported (by
kernel/ksyms.c) unconditionally.  This patch makes them conditional.


Patch:



[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: nommu-exports-20021126.patch --]
[-- Type: text/x-patch, Size: 757 bytes --]

diff -ruN -X../cludes ../orig/linux-2.5.49-uc0/kernel/ksyms.c kernel/ksyms.c
--- ../orig/linux-2.5.49-uc0/kernel/ksyms.c	2002-11-25 10:30:10.000000000 +0900
+++ kernel/ksyms.c	2002-11-25 14:32:43.000000000 +0900
@@ -324,7 +324,9 @@
 /* for stackable file systems (lofs, wrapfs, cryptfs, etc.) */
 EXPORT_SYMBOL(default_llseek);
 EXPORT_SYMBOL(dentry_open);
+#ifdef CONFIG_MMU
 EXPORT_SYMBOL(filemap_nopage);
+#endif
 EXPORT_SYMBOL(filemap_fdatawrite);
 EXPORT_SYMBOL(filemap_fdatawait);
 EXPORT_SYMBOL(lock_page);
@@ -525,7 +527,9 @@
 EXPORT_SYMBOL(single_release);
 
 /* Program loader interfaces */
+#ifdef CONFIG_MMU
 EXPORT_SYMBOL(setup_arg_pages);
+#endif
 EXPORT_SYMBOL(copy_strings_kernel);
 EXPORT_SYMBOL(do_execve);
 EXPORT_SYMBOL(flush_old_exec);

[-- Attachment #3: Type: text/plain, Size: 163 bytes --]



Thanks,

-Miles
-- 
Love is a snowmobile racing across the tundra.  Suddenly it flips over,
pinning you underneath.  At night the ice weasels come.  --Nietzsche

[PATCH] v850 additions to include/linux/elf.h

[Miles Bader]

[-- Attachment #1: Type: text/plain, Size: 112 bytes --]

Hi,

This patch adds more stuff to include/linux/elf.h for the v850 (used by
the new module loader).


Patch:



[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: v850-elfdefs-20021126.patch --]
[-- Type: text/x-patch, Size: 1529 bytes --]

diff -ruN -X../cludes ../orig/linux-2.5.49-uc0/include/linux/elf.h include/linux/elf.h
--- ../orig/linux-2.5.49-uc0/include/linux/elf.h	2002-11-25 10:34:44.000000000 +0900
+++ include/linux/elf.h	2002-11-26 11:10:41.000000000 +0900
@@ -92,6 +92,9 @@
  */
 #define EM_ALPHA	0x9026
 
+/* Bogus old v850 magic number, used by old tools.  */
+#define EM_CYGNUS_V850	0x9080
+
 /*
  * This is the old interim value for S/390 architecture
  */
@@ -450,6 +453,31 @@
 /* Keep this the last entry.  */
 #define R_390_NUM	27
 
+
+/* v850 relocations.  */
+#define R_V850_NONE		0
+#define R_V850_9_PCREL		1
+#define R_V850_22_PCREL		2
+#define R_V850_HI16_S		3
+#define R_V850_HI16		4
+#define R_V850_LO16		5
+#define R_V850_32		6
+#define R_V850_16		7
+#define R_V850_8		8
+#define R_V850_SDA_16_16_OFFSET	9	/* For ld.b, st.b, set1, clr1,
+					   not1, tst1, movea, movhi */
+#define R_V850_SDA_15_16_OFFSET	10	/* For ld.w, ld.h, ld.hu, st.w, st.h */
+#define R_V850_ZDA_16_16_OFFSET	11	/* For ld.b, st.b, set1, clr1,
+					   not1, tst1, movea, movhi */
+#define R_V850_ZDA_15_16_OFFSET	12	/* For ld.w, ld.h, ld.hu, st.w, st.h */
+#define R_V850_TDA_6_8_OFFSET	13	/* For sst.w, sld.w */
+#define R_V850_TDA_7_8_OFFSET	14	/* For sst.h, sld.h */
+#define R_V850_TDA_7_7_OFFSET	15	/* For sst.b, sld.b */
+#define R_V850_TDA_16_16_OFFSET	16	/* For set1, clr1, not1, tst1,
+					   movea, movhi */
+#define R_V850_NUM		17
+
+
 /* Legal values for e_flags field of Elf64_Ehdr.  */
 
 #define EF_ALPHA_32BIT		1	/* All addresses are below 2GB */

[-- Attachment #3: Type: text/plain, Size: 208 bytes --]



Thanks,

-Miles
-- 
[|nurgle|]  ddt- demonic? so quake will have an evil kinda setting? one that 
            will  make every christian in the world foamm at the mouth? 
[iddt]      nurg, that's the goal 

Re: [PATCH] v850 additions to include/linux/elf.h

[Alan Cox]

On Tue, 2002-11-26 at 07:49, Miles Bader wrote:
> Hi,
> 
> This patch adds more stuff to include/linux/elf.h for the v850 (used by
> the new module loader).

To save cluttering a linux/*.h file couldnt the module loader for v850 
include an asm/*.h file holding the extra info ?

Re: [PATCH] v850 additions to include/linux/elf.h

[Miles Bader]

Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
> > This patch adds more stuff to include/linux/elf.h for the v850 (used by
> > the new module loader).
> 
> To save cluttering a linux/*.h file couldnt the module loader for v850 
> include an asm/*.h file holding the extra info ?

I suppose so, but the v850 is not exceptional in this regard.
The various relocation type constants (R_...) in elf.h are completely
unused in the kernel on _every_ architecture, except by the new module
loader.

If tidying is needed, then it seems like the best thing would be to move
all the arch-specific stuff into the corresponding <asm/elf.h> file for
each architecture.  I presume the reason this hasn't been done is simply
convention -- userland elf.h files are also giant conglomerations of
defines for every supported architecture ...

-Miles
-- 
Next to fried food, the South has suffered most from oratory.
  			-- Walter Hines Page

Re: [PATCH] v850 additions to include/linux/elf.h

[Alan Cox]

On Wed, 2002-11-27 at 01:19, Miles Bader wrote:
> If tidying is needed, then it seems like the best thing would be to move
> all the arch-specific stuff into the corresponding <asm/elf.h> file for
> each architecture.  I presume the reason this hasn't been done is simply
> convention -- userland elf.h files are also giant conglomerations of
> defines for every supported architecture ...

I agree entirely. So lets start with v850 8)

Re: [PATCH] v850 additions to include/linux/elf.h

[Miles Bader]

Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
> > If tidying is needed, then it seems like the best thing would be to move
> > all the arch-specific stuff into the corresponding <asm/elf.h> file for
> > each architecture.
> 
> I agree entirely. So lets start with v850 8)

Okay.  I sent the previous patch to Linus and he doesn't seem to have
taken it; perhaps your suggestion will fare better.

I'd like to remain consistent with other archs though -- does anyone
want to make a patch (I guess just move all the R_... constants) for them?

-Miles
-- 
Yo mama's so fat when she gets on an elevator it HAS to go down.