powerpc: Move and rename func_descr_t

There are three architectures with function descriptors, try to
have common names for the address they contain in order to
refactor some functions into generic functions later.

powerpc has 'entry'
ia64 has 'ip'
parisc has 'addr'

Vote for 'addr' and update 'func_descr_t' accordingly.

Move it in asm/elf.h to have it at the same place on all
three architectures, remove the typedef which hides its real
type, and change it to a smoother name 'struct func_desc'.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/529b2ba1d001e8f628ef0d30e8044c9b3d0a4921.1644928018.git.christophe.leroy@csgroup.eu

diff --git a/arch/powerpc/include/asm/code-patching.h b/arch/powerpc/include/asm/code-patching.h
index e260805..409483b 100644 (file)
--- a/arch/powerpc/include/asm/code-patching.h
+++ b/arch/powerpc/include/asm/code-patching.h
@@ -118,7 +118,7 @@ static inline unsigned long ppc_function_entry(void *func)
         * function's descriptor. The first entry in the descriptor is the
         * address of the function text.
         */
-       return ((func_descr_t *)func)->entry;
+       return ((struct func_desc *)func)->addr;
 #else
        return (unsigned long)func;
 #endif

diff --git a/arch/powerpc/include/asm/elf.h b/arch/powerpc/include/asm/elf.h
index b8425e3..971589a 100644 (file)
--- a/arch/powerpc/include/asm/elf.h
+++ b/arch/powerpc/include/asm/elf.h
@@ -176,4 +176,10 @@ do {                                                                       \
 /* Relocate the kernel image to @final_address */
 void relocate(unsigned long final_address);
 
+struct func_desc {
+       unsigned long addr;
+       unsigned long toc;
+       unsigned long env;
+};
+
 #endif /* _ASM_POWERPC_ELF_H */

diff --git a/arch/powerpc/include/asm/types.h b/arch/powerpc/include/asm/types.h
index f1630c5..97da77b 100644 (file)
--- a/arch/powerpc/include/asm/types.h
+++ b/arch/powerpc/include/asm/types.h
@@ -23,12 +23,6 @@
 
 typedef __vector128 vector128;
 
-typedef struct {
-       unsigned long entry;
-       unsigned long toc;
-       unsigned long env;
-} func_descr_t;
-
 #endif /* __ASSEMBLY__ */
 
 #endif /* _ASM_POWERPC_TYPES_H */

diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index d1e1fc0..73d483b 100644 (file)
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -936,11 +936,11 @@ int handle_rt_signal64(struct ksignal *ksig, sigset_t *set,
                 * descriptor is the entry address of signal and the second
                 * entry is the TOC value we need to use.
                 */
-               func_descr_t __user *funct_desc_ptr =
-                       (func_descr_t __user *) ksig->ka.sa.sa_handler;
+               struct func_desc __user *ptr =
+                       (struct func_desc __user *)ksig->ka.sa.sa_handler;
 
-               err |= get_user(regs->ctr, &funct_desc_ptr->entry);
-               err |= get_user(regs->gpr[2], &funct_desc_ptr->toc);
+               err |= get_user(regs->ctr, &ptr->addr);
+               err |= get_user(regs->gpr[2], &ptr->toc);
        }
 
        /* enter the signal handler in native-endian mode */