Commit 03b51416 authored by Naveen N. Rao's avatar Naveen N. Rao Committed by Michael Ellerman
Browse files

powerpc/module_64: Consolidate ftrace code 



module_trampoline_target() is only used by ftrace. Move the prototype
within the appropriate #ifdef in the header. Also, move the function
body to the end of module_64.c so as to consolidate all ftrace code in
one place.

No functional changes.

Signed-off-by: default avatarNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/2527351f65c53c5866068ae130dc34c5d4ee8ad9.1587488954.git.naveen.n.rao@linux.vnet.ibm.com
parent 888468ce

arch/powerpc/include/asm/module.h

+0 −3
Original line number Diff line number Diff line
@@ -90,12 +90,9 @@ struct mod_arch_specific { 
#    ifdef MODULE

	asm(".section .ftrace.tramp,\"ax\",@nobits; .align 3; .previous");

#    endif	/* MODULE */

#endif



int module_trampoline_target(struct module *mod, unsigned long trampoline,

			     unsigned long *target);



#ifdef CONFIG_DYNAMIC_FTRACE

int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs);

#else

static inline int module_finalize_ftrace(struct module *mod, const Elf_Shdr *sechdrs)

arch/powerpc/kernel/module_64.c

+33 −36
Original line number Diff line number Diff line
@@ -145,42 +145,6 @@ static u32 ppc64_stub_insns[] = { 
	PPC_INST_BCTR,

};



#ifdef CONFIG_DYNAMIC_FTRACE

int module_trampoline_target(struct module *mod, unsigned long addr,

			     unsigned long *target)

{

	struct ppc64_stub_entry *stub;

	func_desc_t funcdata;

	u32 magic;



	if (!within_module_core(addr, mod)) {

		pr_err("%s: stub %lx not in module %s\n", __func__, addr, mod->name);

		return -EFAULT;

	}



	stub = (struct ppc64_stub_entry *)addr;



	if (probe_kernel_read(&magic, &stub->magic, sizeof(magic))) {

		pr_err("%s: fault reading magic for stub %lx for %s\n", __func__, addr, mod->name);

		return -EFAULT;

	}



	if (magic != STUB_MAGIC) {

		pr_err("%s: bad magic for stub %lx for %s\n", __func__, addr, mod->name);

		return -EFAULT;

	}



	if (probe_kernel_read(&funcdata, &stub->funcdata, sizeof(funcdata))) {

		pr_err("%s: fault reading funcdata for stub %lx for %s\n", __func__, addr, mod->name);

                return -EFAULT;

	}



	*target = stub_func_addr(funcdata);



	return 0;

}

#endif



/* Count how many different 24-bit relocations (different symbol,

   different addend) */

static unsigned int count_relocs(const Elf64_Rela *rela, unsigned int num)
@@ -731,6 +695,39 @@ int apply_relocate_add(Elf64_Shdr *sechdrs, 
}



#ifdef CONFIG_DYNAMIC_FTRACE

int module_trampoline_target(struct module *mod, unsigned long addr,

			     unsigned long *target)

{

	struct ppc64_stub_entry *stub;

	func_desc_t funcdata;

	u32 magic;



	if (!within_module_core(addr, mod)) {

		pr_err("%s: stub %lx not in module %s\n", __func__, addr, mod->name);

		return -EFAULT;

	}



	stub = (struct ppc64_stub_entry *)addr;



	if (probe_kernel_read(&magic, &stub->magic, sizeof(magic))) {

		pr_err("%s: fault reading magic for stub %lx for %s\n", __func__, addr, mod->name);

		return -EFAULT;

	}



	if (magic != STUB_MAGIC) {

		pr_err("%s: bad magic for stub %lx for %s\n", __func__, addr, mod->name);

		return -EFAULT;

	}



	if (probe_kernel_read(&funcdata, &stub->funcdata, sizeof(funcdata))) {

		pr_err("%s: fault reading funcdata for stub %lx for %s\n", __func__, addr, mod->name);

                return -EFAULT;

	}



	*target = stub_func_addr(funcdata);



	return 0;

}



#ifdef CONFIG_MPROFILE_KERNEL

CRA Git | Maintained and supported by SUSTech CRA and CCSE