Skip to content
Snippets Groups Projects
Select Git revision
  • d8ed257f313f64e9835e61d1365dea95a0a1c9c6
  • vme-testing default
  • ci-test
  • master
  • remoteproc
  • am625-sk-ov5640
  • pcal6534-upstreaming
  • lps22df-upstreaming
  • msc-upstreaming
  • imx8mp
  • iio/noa1305
  • vme-next
  • vme-next-4.14-rc4
  • v4.14-rc4
  • v4.14-rc3
  • v4.14-rc2
  • v4.14-rc1
  • v4.13
  • vme-next-4.13-rc7
  • v4.13-rc7
  • v4.13-rc6
  • v4.13-rc5
  • v4.13-rc4
  • v4.13-rc3
  • v4.13-rc2
  • v4.13-rc1
  • v4.12
  • v4.12-rc7
  • v4.12-rc6
  • v4.12-rc5
  • v4.12-rc4
  • v4.12-rc3
32 results

tcp_output.c

Blame
  • code-patching.c 17.95 KiB
    /*
     *  Copyright 2008 Michael Ellerman, IBM Corporation.
     *
     *  This program is free software; you can redistribute it and/or
     *  modify it under the terms of the GNU General Public License
     *  as published by the Free Software Foundation; either version
     *  2 of the License, or (at your option) any later version.
     */
    
    #include <linux/kernel.h>
    #include <linux/kprobes.h>
    #include <linux/vmalloc.h>
    #include <linux/init.h>
    #include <linux/mm.h>
    #include <linux/cpuhotplug.h>
    #include <linux/slab.h>
    #include <linux/uaccess.h>
    #include <linux/kprobes.h>
    
    #include <asm/pgtable.h>
    #include <asm/tlbflush.h>
    #include <asm/page.h>
    #include <asm/code-patching.h>
    #include <asm/setup.h>
    
    static int __patch_instruction(unsigned int *exec_addr, unsigned int instr,
    			       unsigned int *patch_addr)
    {
    	int err;
    
    	__put_user_size(instr, patch_addr, 4, err);
    	if (err)
    		return err;
    
    	asm ("dcbst 0, %0; sync; icbi 0,%1; sync; isync" :: "r" (patch_addr),
    							    "r" (exec_addr));
    
    	return 0;
    }
    
    int raw_patch_instruction(unsigned int *addr, unsigned int instr)
    {
    	return __patch_instruction(addr, instr, addr);
    }
    
    #ifdef CONFIG_STRICT_KERNEL_RWX
    static DEFINE_PER_CPU(struct vm_struct *, text_poke_area);
    
    static int text_area_cpu_up(unsigned int cpu)
    {
    	struct vm_struct *area;
    
    	area = get_vm_area(PAGE_SIZE, VM_ALLOC);
    	if (!area) {
    		WARN_ONCE(1, "Failed to create text area for cpu %d\n",
    			cpu);
    		return -1;
    	}
    	this_cpu_write(text_poke_area, area);
    
    	return 0;
    }
    
    static int text_area_cpu_down(unsigned int cpu)
    {
    	free_vm_area(this_cpu_read(text_poke_area));
    	return 0;
    }
    
    /*
     * Run as a late init call. This allows all the boot time patching to be done
     * simply by patching the code, and then we're called here prior to
     * mark_rodata_ro(), which happens after all init calls are run. Although
     * BUG_ON() is rude, in this case it should only happen if ENOMEM, and we judge
     * it as being preferable to a kernel that will crash later when someone tries
     * to use patch_instruction().
     */
    static int __init setup_text_poke_area(void)
    {
    	BUG_ON(!cpuhp_setup_state(CPUHP_AP_ONLINE_DYN,
    		"powerpc/text_poke:online", text_area_cpu_up,
    		text_area_cpu_down));
    
    	return 0;
    }
    late_initcall(setup_text_poke_area);
    
    /*
     * This can be called for kernel text or a module.
     */
    static int map_patch_area(void *addr, unsigned long text_poke_addr)
    {
    	unsigned long pfn;
    	int err;
    
    	if (is_vmalloc_addr(addr))
    		pfn = vmalloc_to_pfn(addr);
    	else
    		pfn = __pa_symbol(addr) >> PAGE_SHIFT;
    
    	err = map_kernel_page(text_poke_addr, (pfn << PAGE_SHIFT),
    				pgprot_val(PAGE_KERNEL));
    
    	pr_devel("Mapped addr %lx with pfn %lx:%d\n", text_poke_addr, pfn, err);
    	if (err)
    		return -1;
    
    	return 0;
    }
    
    static inline int unmap_patch_area(unsigned long addr)
    {
    	pte_t *ptep;
    	pmd_t *pmdp;
    	pud_t *pudp;
    	pgd_t *pgdp;
    
    	pgdp = pgd_offset_k(addr);
    	if (unlikely(!pgdp))
    		return -EINVAL;
    
    	pudp = pud_offset(pgdp, addr);
    	if (unlikely(!pudp))
    		return -EINVAL;
    
    	pmdp = pmd_offset(pudp, addr);
    	if (unlikely(!pmdp))
    		return -EINVAL;
    
    	ptep = pte_offset_kernel(pmdp, addr);
    	if (unlikely(!ptep))
    		return -EINVAL;
    
    	pr_devel("clearing mm %p, pte %p, addr %lx\n", &init_mm, ptep, addr);
    
    	/*
    	 * In hash, pte_clear flushes the tlb, in radix, we have to
    	 */
    	pte_clear(&init_mm, addr, ptep);
    	flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
    
    	return 0;
    }
    
    int patch_instruction(unsigned int *addr, unsigned int instr)
    {
    	int err;
    	unsigned int *patch_addr = NULL;
    	unsigned long flags;
    	unsigned long text_poke_addr;
    	unsigned long kaddr = (unsigned long)addr;
    
    	/*
    	 * During early early boot patch_instruction is called
    	 * when text_poke_area is not ready, but we still need
    	 * to allow patching. We just do the plain old patching
    	 */
    	if (!this_cpu_read(text_poke_area))
    		return raw_patch_instruction(addr, instr);
    
    	local_irq_save(flags);
    
    	text_poke_addr = (unsigned long)__this_cpu_read(text_poke_area)->addr;
    	if (map_patch_area(addr, text_poke_addr)) {
    		err = -1;
    		goto out;
    	}
    
    	patch_addr = (unsigned int *)(text_poke_addr) +
    			((kaddr & ~PAGE_MASK) / sizeof(unsigned int));
    
    	__patch_instruction(addr, instr, patch_addr);
    
    	err = unmap_patch_area(text_poke_addr);
    	if (err)
    		pr_warn("failed to unmap %lx\n", text_poke_addr);
    
    out:
    	local_irq_restore(flags);
    
    	return err;
    }
    #else /* !CONFIG_STRICT_KERNEL_RWX */
    
    int patch_instruction(unsigned int *addr, unsigned int instr)
    {
    	return raw_patch_instruction(addr, instr);
    }
    
    #endif /* CONFIG_STRICT_KERNEL_RWX */
    NOKPROBE_SYMBOL(patch_instruction);
    
    int patch_branch(unsigned int *addr, unsigned long target, int flags)
    {
    	return patch_instruction(addr, create_branch(addr, target, flags));
    }
    
    bool is_offset_in_branch_range(long offset)
    {
    	/*
    	 * Powerpc branch instruction is :
    	 *
    	 *  0         6                 30   31
    	 *  +---------+----------------+---+---+
    	 *  | opcode  |     LI         |AA |LK |
    	 *  +---------+----------------+---+---+
    	 *  Where AA = 0 and LK = 0
    	 *
    	 * LI is a signed 24 bits integer. The real branch offset is computed
    	 * by: imm32 = SignExtend(LI:'0b00', 32);
    	 *
    	 * So the maximum forward branch should be:
    	 *   (0x007fffff << 2) = 0x01fffffc =  0x1fffffc
    	 * The maximum backward branch should be:
    	 *   (0xff800000 << 2) = 0xfe000000 = -0x2000000
    	 */
    	return (offset >= -0x2000000 && offset <= 0x1fffffc && !(offset & 0x3));
    }
    
    /*
     * Helper to check if a given instruction is a conditional branch
     * Derived from the conditional checks in analyse_instr()
     */
    bool is_conditional_branch(unsigned int instr)
    {
    	unsigned int opcode = instr >> 26;
    
    	if (opcode == 16)       /* bc, bca, bcl, bcla */
    		return true;
    	if (opcode == 19) {
    		switch ((instr >> 1) & 0x3ff) {
    		case 16:        /* bclr, bclrl */
    		case 528:       /* bcctr, bcctrl */
    		case 560:       /* bctar, bctarl */
    			return true;
    		}
    	}
    	return false;
    }
    NOKPROBE_SYMBOL(is_conditional_branch);
    
    unsigned int create_branch(const unsigned int *addr,
    			   unsigned long target, int flags)
    {
    	unsigned int instruction;
    	long offset;
    
    	offset = target;
    	if (! (flags & BRANCH_ABSOLUTE))
    		offset = offset - (unsigned long)addr;
    
    	/* Check we can represent the target in the instruction format */
    	if (!is_offset_in_branch_range(offset))
    		return 0;
    
    	/* Mask out the flags and target, so they don't step on each other. */
    	instruction = 0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC);
    
    	return instruction;
    }
    
    unsigned int create_cond_branch(const unsigned int *addr,
    				unsigned long target, int flags)
    {
    	unsigned int instruction;
    	long offset;
    
    	offset = target;
    	if (! (flags & BRANCH_ABSOLUTE))
    		offset = offset - (unsigned long)addr;
    
    	/* Check we can represent the target in the instruction format */
    	if (offset < -0x8000 || offset > 0x7FFF || offset & 0x3)
    		return 0;
    
    	/* Mask out the flags and target, so they don't step on each other. */
    	instruction = 0x40000000 | (flags & 0x3FF0003) | (offset & 0xFFFC);
    
    	return instruction;
    }
    
    static unsigned int branch_opcode(unsigned int instr)
    {
    	return (instr >> 26) & 0x3F;
    }
    
    static int instr_is_branch_iform(unsigned int instr)
    {
    	return branch_opcode(instr) == 18;
    }
    
    static int instr_is_branch_bform(unsigned int instr)
    {
    	return branch_opcode(instr) == 16;
    }
    
    int instr_is_relative_branch(unsigned int instr)
    {
    	if (instr & BRANCH_ABSOLUTE)
    		return 0;
    
    	return instr_is_branch_iform(instr) || instr_is_branch_bform(instr);
    }
    
    int instr_is_relative_link_branch(unsigned int instr)
    {
    	return instr_is_relative_branch(instr) && (instr & BRANCH_SET_LINK);
    }
    
    static unsigned long branch_iform_target(const unsigned int *instr)
    {
    	signed long imm;
    
    	imm = *instr & 0x3FFFFFC;
    
    	/* If the top bit of the immediate value is set this is negative */
    	if (imm & 0x2000000)
    		imm -= 0x4000000;
    
    	if ((*instr & BRANCH_ABSOLUTE) == 0)
    		imm += (unsigned long)instr;
    
    	return (unsigned long)imm;
    }
    
    static unsigned long branch_bform_target(const unsigned int *instr)
    {
    	signed long imm;
    
    	imm = *instr & 0xFFFC;
    
    	/* If the top bit of the immediate value is set this is negative */
    	if (imm & 0x8000)
    		imm -= 0x10000;
    
    	if ((*instr & BRANCH_ABSOLUTE) == 0)
    		imm += (unsigned long)instr;
    
    	return (unsigned long)imm;
    }
    
    unsigned long branch_target(const unsigned int *instr)
    {
    	if (instr_is_branch_iform(*instr))
    		return branch_iform_target(instr);
    	else if (instr_is_branch_bform(*instr))
    		return branch_bform_target(instr);
    
    	return 0;
    }
    
    int instr_is_branch_to_addr(const unsigned int *instr, unsigned long addr)
    {
    	if (instr_is_branch_iform(*instr) || instr_is_branch_bform(*instr))
    		return branch_target(instr) == addr;
    
    	return 0;
    }
    
    unsigned int translate_branch(const unsigned int *dest, const unsigned int *src)
    {
    	unsigned long target;
    
    	target = branch_target(src);
    
    	if (instr_is_branch_iform(*src))
    		return create_branch(dest, target, *src);
    	else if (instr_is_branch_bform(*src))
    		return create_cond_branch(dest, target, *src);
    
    	return 0;
    }
    
    #ifdef CONFIG_PPC_BOOK3E_64
    void __patch_exception(int exc, unsigned long addr)
    {
    	extern unsigned int interrupt_base_book3e;
    	unsigned int *ibase = &interrupt_base_book3e;
    
    	/* Our exceptions vectors start with a NOP and -then- a branch
    	 * to deal with single stepping from userspace which stops on
    	 * the second instruction. Thus we need to patch the second
    	 * instruction of the exception, not the first one
    	 */
    
    	patch_branch(ibase + (exc / 4) + 1, addr, 0);
    }
    #endif
    
    #ifdef CONFIG_CODE_PATCHING_SELFTEST
    
    static void __init test_trampoline(void)
    {
    	asm ("nop;\n");
    }
    
    #define check(x)	\
    	if (!(x)) printk("code-patching: test failed at line %d\n", __LINE__);
    
    static void __init test_branch_iform(void)
    {
    	unsigned int instr;
    	unsigned long addr;
    
    	addr = (unsigned long)&instr;
    
    	/* The simplest case, branch to self, no flags */
    	check(instr_is_branch_iform(0x48000000));
    	/* All bits of target set, and flags */
    	check(instr_is_branch_iform(0x4bffffff));
    	/* High bit of opcode set, which is wrong */
    	check(!instr_is_branch_iform(0xcbffffff));
    	/* Middle bits of opcode set, which is wrong */
    	check(!instr_is_branch_iform(0x7bffffff));
    
    	/* Simplest case, branch to self with link */
    	check(instr_is_branch_iform(0x48000001));
    	/* All bits of targets set */
    	check(instr_is_branch_iform(0x4bfffffd));
    	/* Some bits of targets set */
    	check(instr_is_branch_iform(0x4bff00fd));
    	/* Must be a valid branch to start with */
    	check(!instr_is_branch_iform(0x7bfffffd));
    
    	/* Absolute branch to 0x100 */
    	instr = 0x48000103;
    	check(instr_is_branch_to_addr(&instr, 0x100));
    	/* Absolute branch to 0x420fc */
    	instr = 0x480420ff;
    	check(instr_is_branch_to_addr(&instr, 0x420fc));
    	/* Maximum positive relative branch, + 20MB - 4B */
    	instr = 0x49fffffc;
    	check(instr_is_branch_to_addr(&instr, addr + 0x1FFFFFC));
    	/* Smallest negative relative branch, - 4B */
    	instr = 0x4bfffffc;
    	check(instr_is_branch_to_addr(&instr, addr - 4));
    	/* Largest negative relative branch, - 32 MB */
    	instr = 0x4a000000;
    	check(instr_is_branch_to_addr(&instr, addr - 0x2000000));
    
    	/* Branch to self, with link */
    	instr = create_branch(&instr, addr, BRANCH_SET_LINK);
    	check(instr_is_branch_to_addr(&instr, addr));
    
    	/* Branch to self - 0x100, with link */
    	instr = create_branch(&instr, addr - 0x100, BRANCH_SET_LINK);
    	check(instr_is_branch_to_addr(&instr, addr - 0x100));
    
    	/* Branch to self + 0x100, no link */
    	instr = create_branch(&instr, addr + 0x100, 0);
    	check(instr_is_branch_to_addr(&instr, addr + 0x100));
    
    	/* Maximum relative negative offset, - 32 MB */
    	instr = create_branch(&instr, addr - 0x2000000, BRANCH_SET_LINK);
    	check(instr_is_branch_to_addr(&instr, addr - 0x2000000));
    
    	/* Out of range relative negative offset, - 32 MB + 4*/
    	instr = create_branch(&instr, addr - 0x2000004, BRANCH_SET_LINK);
    	check(instr == 0);
    
    	/* Out of range relative positive offset, + 32 MB */
    	instr = create_branch(&instr, addr + 0x2000000, BRANCH_SET_LINK);
    	check(instr == 0);
    
    	/* Unaligned target */
    	instr = create_branch(&instr, addr + 3, BRANCH_SET_LINK);
    	check(instr == 0);
    
    	/* Check flags are masked correctly */
    	instr = create_branch(&instr, addr, 0xFFFFFFFC);
    	check(instr_is_branch_to_addr(&instr, addr));
    	check(instr == 0x48000000);
    }
    
    static void __init test_create_function_call(void)
    {
    	unsigned int *iptr;
    	unsigned long dest;
    
    	/* Check we can create a function call */
    	iptr = (unsigned int *)ppc_function_entry(test_trampoline);
    	dest = ppc_function_entry(test_create_function_call);
    	patch_instruction(iptr, create_branch(iptr, dest, BRANCH_SET_LINK));
    	check(instr_is_branch_to_addr(iptr, dest));
    }
    
    static void __init test_branch_bform(void)
    {
    	unsigned long addr;
    	unsigned int *iptr, instr, flags;
    
    	iptr = &instr;
    	addr = (unsigned long)iptr;
    
    	/* The simplest case, branch to self, no flags */
    	check(instr_is_branch_bform(0x40000000));
    	/* All bits of target set, and flags */
    	check(instr_is_branch_bform(0x43ffffff));
    	/* High bit of opcode set, which is wrong */
    	check(!instr_is_branch_bform(0xc3ffffff));
    	/* Middle bits of opcode set, which is wrong */
    	check(!instr_is_branch_bform(0x7bffffff));
    
    	/* Absolute conditional branch to 0x100 */
    	instr = 0x43ff0103;
    	check(instr_is_branch_to_addr(&instr, 0x100));
    	/* Absolute conditional branch to 0x20fc */
    	instr = 0x43ff20ff;
    	check(instr_is_branch_to_addr(&instr, 0x20fc));
    	/* Maximum positive relative conditional branch, + 32 KB - 4B */
    	instr = 0x43ff7ffc;
    	check(instr_is_branch_to_addr(&instr, addr + 0x7FFC));
    	/* Smallest negative relative conditional branch, - 4B */
    	instr = 0x43fffffc;
    	check(instr_is_branch_to_addr(&instr, addr - 4));
    	/* Largest negative relative conditional branch, - 32 KB */
    	instr = 0x43ff8000;
    	check(instr_is_branch_to_addr(&instr, addr - 0x8000));
    
    	/* All condition code bits set & link */
    	flags = 0x3ff000 | BRANCH_SET_LINK;
    
    	/* Branch to self */
    	instr = create_cond_branch(iptr, addr, flags);
    	check(instr_is_branch_to_addr(&instr, addr));
    
    	/* Branch to self - 0x100 */
    	instr = create_cond_branch(iptr, addr - 0x100, flags);
    	check(instr_is_branch_to_addr(&instr, addr - 0x100));
    
    	/* Branch to self + 0x100 */
    	instr = create_cond_branch(iptr, addr + 0x100, flags);
    	check(instr_is_branch_to_addr(&instr, addr + 0x100));
    
    	/* Maximum relative negative offset, - 32 KB */
    	instr = create_cond_branch(iptr, addr - 0x8000, flags);
    	check(instr_is_branch_to_addr(&instr, addr - 0x8000));
    
    	/* Out of range relative negative offset, - 32 KB + 4*/
    	instr = create_cond_branch(iptr, addr - 0x8004, flags);
    	check(instr == 0);
    
    	/* Out of range relative positive offset, + 32 KB */
    	instr = create_cond_branch(iptr, addr + 0x8000, flags);
    	check(instr == 0);
    
    	/* Unaligned target */
    	instr = create_cond_branch(iptr, addr + 3, flags);
    	check(instr == 0);
    
    	/* Check flags are masked correctly */
    	instr = create_cond_branch(iptr, addr, 0xFFFFFFFC);
    	check(instr_is_branch_to_addr(&instr, addr));
    	check(instr == 0x43FF0000);
    }
    
    static void __init test_translate_branch(void)
    {
    	unsigned long addr;
    	unsigned int *p, *q;
    	void *buf;
    
    	buf = vmalloc(PAGE_ALIGN(0x2000000 + 1));
    	check(buf);
    	if (!buf)
    		return;
    
    	/* Simple case, branch to self moved a little */
    	p = buf;
    	addr = (unsigned long)p;
    	patch_branch(p, addr, 0);
    	check(instr_is_branch_to_addr(p, addr));
    	q = p + 1;
    	patch_instruction(q, translate_branch(q, p));
    	check(instr_is_branch_to_addr(q, addr));
    
    	/* Maximum negative case, move b . to addr + 32 MB */
    	p = buf;
    	addr = (unsigned long)p;
    	patch_branch(p, addr, 0);
    	q = buf + 0x2000000;
    	patch_instruction(q, translate_branch(q, p));
    	check(instr_is_branch_to_addr(p, addr));
    	check(instr_is_branch_to_addr(q, addr));
    	check(*q == 0x4a000000);
    
    	/* Maximum positive case, move x to x - 32 MB + 4 */
    	p = buf + 0x2000000;
    	addr = (unsigned long)p;
    	patch_branch(p, addr, 0);
    	q = buf + 4;
    	patch_instruction(q, translate_branch(q, p));
    	check(instr_is_branch_to_addr(p, addr));
    	check(instr_is_branch_to_addr(q, addr));
    	check(*q == 0x49fffffc);
    
    	/* Jump to x + 16 MB moved to x + 20 MB */
    	p = buf;
    	addr = 0x1000000 + (unsigned long)buf;
    	patch_branch(p, addr, BRANCH_SET_LINK);
    	q = buf + 0x1400000;
    	patch_instruction(q, translate_branch(q, p));
    	check(instr_is_branch_to_addr(p, addr));
    	check(instr_is_branch_to_addr(q, addr));
    
    	/* Jump to x + 16 MB moved to x - 16 MB + 4 */
    	p = buf + 0x1000000;
    	addr = 0x2000000 + (unsigned long)buf;
    	patch_branch(p, addr, 0);
    	q = buf + 4;
    	patch_instruction(q, translate_branch(q, p));
    	check(instr_is_branch_to_addr(p, addr));
    	check(instr_is_branch_to_addr(q, addr));
    
    
    	/* Conditional branch tests */
    
    	/* Simple case, branch to self moved a little */
    	p = buf;
    	addr = (unsigned long)p;
    	patch_instruction(p, create_cond_branch(p, addr, 0));
    	check(instr_is_branch_to_addr(p, addr));
    	q = p + 1;
    	patch_instruction(q, translate_branch(q, p));
    	check(instr_is_branch_to_addr(q, addr));
    
    	/* Maximum negative case, move b . to addr + 32 KB */
    	p = buf;
    	addr = (unsigned long)p;
    	patch_instruction(p, create_cond_branch(p, addr, 0xFFFFFFFC));
    	q = buf + 0x8000;
    	patch_instruction(q, translate_branch(q, p));
    	check(instr_is_branch_to_addr(p, addr));
    	check(instr_is_branch_to_addr(q, addr));
    	check(*q == 0x43ff8000);
    
    	/* Maximum positive case, move x to x - 32 KB + 4 */
    	p = buf + 0x8000;
    	addr = (unsigned long)p;
    	patch_instruction(p, create_cond_branch(p, addr, 0xFFFFFFFC));
    	q = buf + 4;
    	patch_instruction(q, translate_branch(q, p));
    	check(instr_is_branch_to_addr(p, addr));
    	check(instr_is_branch_to_addr(q, addr));
    	check(*q == 0x43ff7ffc);
    
    	/* Jump to x + 12 KB moved to x + 20 KB */
    	p = buf;
    	addr = 0x3000 + (unsigned long)buf;
    	patch_instruction(p, create_cond_branch(p, addr, BRANCH_SET_LINK));
    	q = buf + 0x5000;
    	patch_instruction(q, translate_branch(q, p));
    	check(instr_is_branch_to_addr(p, addr));
    	check(instr_is_branch_to_addr(q, addr));
    
    	/* Jump to x + 8 KB moved to x - 8 KB + 4 */
    	p = buf + 0x2000;
    	addr = 0x4000 + (unsigned long)buf;
    	patch_instruction(p, create_cond_branch(p, addr, 0));
    	q = buf + 4;
    	patch_instruction(q, translate_branch(q, p));
    	check(instr_is_branch_to_addr(p, addr));
    	check(instr_is_branch_to_addr(q, addr));
    
    	/* Free the buffer we were using */
    	vfree(buf);
    }
    
    static int __init test_code_patching(void)
    {
    	printk(KERN_DEBUG "Running code patching self-tests ...\n");
    
    	test_branch_iform();
    	test_branch_bform();
    	test_create_function_call();
    	test_translate_branch();
    
    	return 0;
    }
    late_initcall(test_code_patching);
    
    #endif /* CONFIG_CODE_PATCHING_SELFTEST */