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[PATCH] uml: kludgy compilation fixes for x86-64 subarch modules support

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These are some trivial fixes for the x86-64 subarch module support.  The only
potential problem is that I have to modify arch/x86_64/kernel/module.c, to
avoid copying the whole of it.

I can't use it verbatim because it depends on a special vmalloc-like area for
modules, which for now (maybe that's to fix, I guess not) UML/x86-64 has not.
I went the easy way and reused the i386 vmalloc()-based allocator.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Acked-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2005-05-05 16:15:16 -07:00 committed by Linus Torvalds
parent f7fe878174
commit 23352fc252
5 changed files with 79 additions and 1 deletions
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7
arch/um/sys-x86_64/Makefile
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@ -4,16 +4,20 @@
# Licensed under the GPL
#
#XXX: why into lib-y?
lib-y = bitops.o bugs.o csum-partial.o delay.o fault.o mem.o memcpy.o \
ptrace.o ptrace_user.o semaphore.o sigcontext.o signal.o \
syscalls.o sysrq.o thunk.o syscall_table.o
obj-y := ksyms.o
obj-$(CONFIG_MODULES) += module.o um_module.o
USER_OBJS := ptrace_user.o sigcontext.o
include arch/um/scripts/Makefile.rules
SYMLINKS = bitops.c csum-copy.S csum-partial.c csum-wrappers.c memcpy.S \
semaphore.c thunk.S
semaphore.c thunk.S module.c
# this needs to be before the foreach, because clean-files does not accept
# complete paths like $(src)/$f.
@ -30,6 +34,7 @@ csum-wrappers.c-dir = lib
memcpy.S-dir = lib
semaphore.c-dir = kernel
thunk.S-dir = lib
module.c-dir = kernel
$(SYMLINKS): FORCE
$(call if_changed,make_link)

23
arch/um/sys-x86_64/ksyms.c Normal file
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@ -0,0 +1,23 @@
#include "linux/module.h"
#include "linux/in6.h"
#include "linux/rwsem.h"
#include "asm/byteorder.h"
#include "asm/semaphore.h"
#include "asm/uaccess.h"
#include "asm/checksum.h"
#include "asm/errno.h"
EXPORT_SYMBOL(__down_failed);
EXPORT_SYMBOL(__down_failed_interruptible);
EXPORT_SYMBOL(__down_failed_trylock);
EXPORT_SYMBOL(__up_wakeup);
/*XXX: we need them because they would be exported by x86_64 */
EXPORT_SYMBOL(__memcpy);
EXPORT_SYMBOL(strcmp);
EXPORT_SYMBOL(strcat);
EXPORT_SYMBOL(strcpy);
/* Networking helper routines. */
/*EXPORT_SYMBOL(csum_partial_copy_from);
EXPORT_SYMBOL(csum_partial_copy_to);*/

19
arch/um/sys-x86_64/um_module.c Normal file
View File

@ -0,0 +1,19 @@
#include <linux/vmalloc.h>
#include <linux/moduleloader.h>
/*Copied from i386 arch/i386/kernel/module.c */
void *module_alloc(unsigned long size)
{
if (size == 0)
return NULL;
return vmalloc_exec(size);
}
/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
vfree(module_region);
/* FIXME: If module_region == mod->init_region, trim exception
table entries. */
}

4
arch/x86_64/kernel/module.c
View File

@ -30,9 +30,12 @@
#define DEBUGP(fmt...)
#ifndef CONFIG_UML
void module_free(struct module *mod, void *module_region)
{
vfree(module_region);
/* FIXME: If module_region == mod->init_region, trim exception
table entries. */
}
void *module_alloc(unsigned long size)
@ -51,6 +54,7 @@ void *module_alloc(unsigned long size)
return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
}
#endif
/* We don't need anything special. */
int module_frob_arch_sections(Elf_Ehdr *hdr,

27
include/asm-um/elf.h
View File

@ -21,6 +21,8 @@ extern long elf_aux_hwcap;
#define USE_ELF_CORE_DUMP
#if defined(CONFIG_UML_X86) && !defined(CONFIG_64BIT)
#define R_386_NONE 0
#define R_386_32 1
#define R_386_PC32 2
@ -34,4 +36,29 @@ extern long elf_aux_hwcap;
#define R_386_GOTPC 10
#define R_386_NUM 11
#elif defined(CONFIG_UML_X86) && defined(CONFIG_64BIT)
/* x86-64 relocation types */
#define R_X86_64_NONE 0 /* No reloc */
#define R_X86_64_64 1 /* Direct 64 bit */
#define R_X86_64_PC32 2 /* PC relative 32 bit signed */
#define R_X86_64_GOT32 3 /* 32 bit GOT entry */
#define R_X86_64_PLT32 4 /* 32 bit PLT address */
#define R_X86_64_COPY 5 /* Copy symbol at runtime */
#define R_X86_64_GLOB_DAT 6 /* Create GOT entry */
#define R_X86_64_JUMP_SLOT 7 /* Create PLT entry */
#define R_X86_64_RELATIVE 8 /* Adjust by program base */
#define R_X86_64_GOTPCREL 9 /* 32 bit signed pc relative
offset to GOT */
#define R_X86_64_32 10 /* Direct 32 bit zero extended */
#define R_X86_64_32S 11 /* Direct 32 bit sign extended */
#define R_X86_64_16 12 /* Direct 16 bit zero extended */
#define R_X86_64_PC16 13 /* 16 bit sign extended pc relative */
#define R_X86_64_8 14 /* Direct 8 bit sign extended */
#define R_X86_64_PC8 15 /* 8 bit sign extended pc relative */
#define R_X86_64_NUM 16
#endif
#endif