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powerpc: Prepare func_desc_t for refactorisation

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In preparation of making func_desc_t generic, change the ELFv2
version to a struct containing 'addr' element.

This allows using single helpers common to ELFv1 and ELFv2 and
reduces the amount of #ifdef's

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/5c36105e08b27b98450535bff48d71b690c19739.1644928018.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-02-15 13:41:00 +01:00 committed by Michael Ellerman
parent 0a9c5ae279
commit 2fd986377d
1 changed files with 18 additions and 18 deletions
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36
arch/powerpc/kernel/module_64.c
View file

@ -33,19 +33,17 @@
#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;
func_desc_t desc = {
.addr = addr,
};
return desc;
}
/* PowerPC64 specific values for the Elf64_Sym st_other field. */
@ -70,14 +68,6 @@ static func_desc_t func_desc(unsigned long addr)
{
return *(struct func_desc *)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;
}
static unsigned int local_entry_offset(const Elf64_Sym *sym)
{
return 0;
@ -93,6 +83,16 @@ 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