[PATCH v2 04/13] powerpc: Prepare func_desc_t for refactorisation

Christophe Leroy
2021-10-14T06:24:40Z

In preparation of making func_desc_t generic, change it to
a struct containing 'addr' element.

In addition this allows using single helpers common to ELFv1 and ELFv2.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
arch/powerpc/kernel/module_64.c | 34 +++++++++++++++------------------
1 file changed, 15 insertions(+), 19 deletions(-)

diff --git a/arch/powerpc/kernel/module_64.c b/arch/powerpc/kernel/module_64.c
index 82908c9be627..dc99a3f6cee2 100644
--- a/arch/powerpc/kernel/module_64.c
+++ b/arch/powerpc/kernel/module_64.c
@@ -33,19 +33,13 @@
#ifdef PPC64_ELF_ABI_v2

/* An address is simply the address of the function. */
-typedef unsigned long func_desc_t;
+typedef struct {
+ unsigned long addr;
+} func_desc_t;

static func_desc_t func_desc(unsigned long addr)
{
- return addr;
-}
-static unsigned long func_addr(unsigned long addr)
-{
- return addr;
-}
-static unsigned long stub_func_addr(func_desc_t func)
-{
- return func;
+ return (func_desc_t){addr};
}

/* PowerPC64 specific values for the Elf64_Sym st_other field. */
@@ -68,15 +62,7 @@ typedef struct ppc64_opd_entry func_desc_t;

static func_desc_t func_desc(unsigned long addr)
{
- return *(struct ppc64_opd_entry *)addr;
-}
-static unsigned long func_addr(unsigned long addr)
-{
- return func_desc(addr).addr;
-}
-static unsigned long stub_func_addr(func_desc_t func)
-{
- return func.addr;
+ return *(func_desc_t *)addr;
}
static unsigned int local_entry_offset(const Elf64_Sym *sym)
{
@@ -93,6 +79,16 @@ void *dereference_module_function_descriptor(struct module *mod, void *ptr)
}
#endif

+static unsigned long func_addr(unsigned long addr)
+{
+ return func_desc(addr).addr;
+}
+
+static unsigned long stub_func_addr(func_desc_t func)
+{
+ return func.addr;
+}
+
#define STUB_MAGIC 0x73747562 /* stub */

/* Like PPC32, we need little trampolines to do > 24-bit jumps (into
--
2.31.1