We are moving towards separate kernel and module function descriptor
dereference callbacks. This patch enables it for parisc64.
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].
Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Signed-off-by: Helge Deller <deller@xxxxxx>
---
arch/parisc/boot/compressed/vmlinux.lds.S | 2 ++
arch/parisc/include/asm/sections.h | 2 ++
arch/parisc/kernel/module.c | 17 +++++++++++++++++
arch/parisc/kernel/process.c | 9 +++++++++
arch/parisc/kernel/vmlinux.lds.S | 2 ++
5 files changed, 32 insertions(+)
diff --git a/arch/parisc/boot/compressed/vmlinux.lds.S b/arch/parisc/boot/compressed/vmlinux.lds.S
index a4ce3314e78e..4ebd4e65524c 100644
--- a/arch/parisc/boot/compressed/vmlinux.lds.S
+++ b/arch/parisc/boot/compressed/vmlinux.lds.S
@@ -29,7 +29,9 @@ SECTIONS
. = ALIGN(16);
/* Linkage tables */
.opd : {
+ __start_opd = .;
*(.opd)
+ __end_opd = .;
} PROVIDE (__gp = .);
.plt : {
*(.plt)
diff --git a/arch/parisc/include/asm/sections.h b/arch/parisc/include/asm/sections.h
index 59fbe0067112..845ddc9a3421 100644
--- a/arch/parisc/include/asm/sections.h
+++ b/arch/parisc/include/asm/sections.h
@@ -7,6 +7,8 @@
#ifdef CONFIG_64BIT
#undef dereference_function_descriptor
unsigned long dereference_function_descriptor(unsigned long);
+#undef dereference_kernel_function_descriptor
+unsigned long dereference_kernel_function_descriptor(unsigned long);
#endif
#endif
diff --git a/arch/parisc/kernel/module.c b/arch/parisc/kernel/module.c
index f1a76935a314..28f89b3dcc11 100644
--- a/arch/parisc/kernel/module.c
+++ b/arch/parisc/kernel/module.c
@@ -66,6 +66,7 @@
#include <asm/pgtable.h>
#include <asm/unwind.h>
+#include <asm/sections.h>
#if 0
#define DEBUGP printk
@@ -954,3 +955,19 @@ void module_arch_cleanup(struct module *mod)
{
deregister_unwind_table(mod);
}
+
+#ifdef CONFIG_64BIT
+unsigned long dereference_module_function_descriptor(struct module *mod,
+ unsigned long addr)
+{
+ unsigned long start_opd = (Elf64_Addr)mod->core_layout.base +
+ mod->arch.fdesc_offset;
+ unsigned long end_opd = start_opd +
+ mod->arch.fdesc_count * sizeof(Elf64_Fdesc);
+
+ if (addr < start_opd || addr >= end_opd)
+ return addr;
+
+ return dereference_function_descriptor(addr);
+}
+#endif
diff --git a/arch/parisc/kernel/process.c b/arch/parisc/kernel/process.c
index f00a5f93492a..ff13726b2d2d 100644
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -276,6 +276,15 @@ unsigned long dereference_function_descriptor(unsigned long ptr)
ptr = (unsigned long)p;
return ptr;
}
+
+unsigned long dereference_kernel_function_descriptor(unsigned long addr)
+{
+ if (addr < (unsigned long)__start_opd ||
+ addr >= (unsigned long)__end_opd)
+ return addr;
+
+ return dereference_function_descriptor(addr);
+}
#endif
static inline unsigned long brk_rnd(void)
diff --git a/arch/parisc/kernel/vmlinux.lds.S b/arch/parisc/kernel/vmlinux.lds.S
index ffe2cbf52d1a..ab030895dd1e 100644
--- a/arch/parisc/kernel/vmlinux.lds.S
+++ b/arch/parisc/kernel/vmlinux.lds.S
@@ -99,7 +99,9 @@ SECTIONS
. = ALIGN(16);
/* Linkage tables */
.opd : {
+ __start_opd = .;
*(.opd)
+ __end_opd = .;
} PROVIDE (__gp = .);
.plt : {
*(.plt)
--
2.14.1
--
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