powerpc: Prepare func_desc_t for refactorisation
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
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@ -33,19 +33,17 @@
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#ifdef PPC64_ELF_ABI_v2
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/* An address is simply the address of the function. */
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typedef unsigned long func_desc_t;
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typedef struct {
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unsigned long addr;
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} func_desc_t;
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static func_desc_t func_desc(unsigned long addr)
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{
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return addr;
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}
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static unsigned long func_addr(unsigned long addr)
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{
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return addr;
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}
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static unsigned long stub_func_addr(func_desc_t func)
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{
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return func;
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func_desc_t desc = {
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.addr = addr,
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};
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return desc;
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}
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/* PowerPC64 specific values for the Elf64_Sym st_other field. */
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@ -70,14 +68,6 @@ static func_desc_t func_desc(unsigned long addr)
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{
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return *(struct func_desc *)addr;
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}
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static unsigned long func_addr(unsigned long addr)
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{
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return func_desc(addr).addr;
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}
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static unsigned long stub_func_addr(func_desc_t func)
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{
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return func.addr;
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}
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static unsigned int local_entry_offset(const Elf64_Sym *sym)
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{
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return 0;
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@ -93,6 +83,16 @@ void *dereference_module_function_descriptor(struct module *mod, void *ptr)
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}
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#endif
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static unsigned long func_addr(unsigned long addr)
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{
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return func_desc(addr).addr;
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}
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static unsigned long stub_func_addr(func_desc_t func)
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{
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return func.addr;
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}
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#define STUB_MAGIC 0x73747562 /* stub */
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/* Like PPC32, we need little trampolines to do > 24-bit jumps (into
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