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powerpc64: Add .opd based function descriptor dereference

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We are moving towards separate kernel and module function descriptor
dereference callbacks. This patch enables it for powerpc64.

For pointers that belong to the kernel
-  Added __start_opd and __end_opd pointers, to track the kernel
   .opd section address range;

-  Added dereference_kernel_function_descriptor(). Now we
   will dereference only function pointers that are within
   [__start_opd, __end_opd);

For pointers that belong to a module
-  Added dereference_module_function_descriptor() to handle module
   function descriptor dereference. Now we will dereference only
   pointers that are within [module->opd.start, module->opd.end).

Link: http://lkml.kernel.org/r/20171109234830.5067-4-sergey.senozhatsky@gmail.com
To: Tony Luck <tony.luck@intel.com>
To: Fenghua Yu <fenghua.yu@intel.com>
To: Helge Deller <deller@gmx.de>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Paul Mackerras <paulus@samba.org>
To: Michael Ellerman <mpe@ellerman.id.au>
To: James Bottomley <jejb@parisc-linux.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-ia64@vger.kernel.org
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Cc: linux-kernel@vger.kernel.org
Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Tested-by: Santosh Sivaraj <santosh@fossix.org> #powerpc
Signed-off-by: Petr Mladek <pmladek@suse.com>
This commit is contained in:
Sergey Senozhatsky
2017-11-10 08:48:27 +09:00
committed by Petr Mladek
parent 8e30788816
commit 5633e85b2c
4 changed files with 31 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
arch/powerpc/kernel/module_64.c
View File

@@ -93,6 +93,15 @@ static unsigned int local_entry_offset(const Elf64_Sym *sym)
{
return 0;
}
void *dereference_module_function_descriptor(struct module *mod, void *ptr)
{
if (ptr < (void *)mod->arch.start_opd ||
ptr >= (void *)mod->arch.end_opd)
return ptr;
return dereference_function_descriptor(ptr);
}
#endif
#define STUB_MAGIC 0x73747562 /* stub */
@@ -344,6 +353,11 @@ int module_frob_arch_sections(Elf64_Ehdr *hdr,
else if (strcmp(secstrings+sechdrs[i].sh_name,"__versions")==0)
dedotify_versions((void *)hdr + sechdrs[i].sh_offset,
sechdrs[i].sh_size);
else if (!strcmp(secstrings + sechdrs[i].sh_name, ".opd")) {
me->arch.start_opd = sechdrs[i].sh_addr;
me->arch.end_opd = sechdrs[i].sh_addr +
sechdrs[i].sh_size;
}
/* We don't handle .init for the moment: rename to _init */
while ((p = strstr(secstrings + sechdrs[i].sh_name, ".init")))

2
arch/powerpc/kernel/vmlinux.lds.S
View File

@@ -278,7 +278,9 @@ SECTIONS
}
.opd : AT(ADDR(.opd) - LOAD_OFFSET) {
__start_opd = .;
*(.opd)
__end_opd = .;
}
. = ALIGN(256);