diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/lib/code-patching.c | 586 |
1 files changed, 84 insertions, 502 deletions
diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c index c5ed98823835..ad0cf3108dd0 100644 --- a/arch/powerpc/lib/code-patching.c +++ b/arch/powerpc/lib/code-patching.c @@ -3,22 +3,19 @@ * Copyright 2008 Michael Ellerman, IBM Corporation. */ -#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/jump_label.h> #include <asm/tlbflush.h> #include <asm/page.h> #include <asm/code-patching.h> -#include <asm/setup.h> #include <asm/inst.h> -static int __patch_instruction(u32 *exec_addr, struct ppc_inst instr, u32 *patch_addr) +static int __patch_instruction(u32 *exec_addr, ppc_inst_t instr, u32 *patch_addr) { if (!ppc_inst_prefixed(instr)) { u32 val = ppc_inst_val(instr); @@ -36,10 +33,10 @@ static int __patch_instruction(u32 *exec_addr, struct ppc_inst instr, u32 *patch return 0; failed: - return -EFAULT; + return -EPERM; } -int raw_patch_instruction(u32 *addr, struct ppc_inst instr) +int raw_patch_instruction(u32 *addr, ppc_inst_t instr) { return __patch_instruction(addr, instr, addr); } @@ -47,9 +44,14 @@ int raw_patch_instruction(u32 *addr, struct ppc_inst instr) #ifdef CONFIG_STRICT_KERNEL_RWX static DEFINE_PER_CPU(struct vm_struct *, text_poke_area); +static int map_patch_area(void *addr, unsigned long text_poke_addr); +static void unmap_patch_area(unsigned long addr); + static int text_area_cpu_up(unsigned int cpu) { struct vm_struct *area; + unsigned long addr; + int err; area = get_vm_area(PAGE_SIZE, VM_ALLOC); if (!area) { @@ -57,6 +59,15 @@ static int text_area_cpu_up(unsigned int cpu) cpu); return -1; } + + // Map/unmap the area to ensure all page tables are pre-allocated + addr = (unsigned long)area->addr; + err = map_patch_area(empty_zero_page, addr); + if (err) + return err; + + unmap_patch_area(addr); + this_cpu_write(text_poke_area, area); return 0; @@ -68,6 +79,8 @@ static int text_area_cpu_down(unsigned int cpu) return 0; } +static __ro_after_init DEFINE_STATIC_KEY_FALSE(poking_init_done); + /* * 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 @@ -78,6 +91,15 @@ void __init poking_init(void) BUG_ON(!cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "powerpc/text_poke:online", text_area_cpu_up, text_area_cpu_down)); + static_branch_enable(&poking_init_done); +} + +static unsigned long get_patch_pfn(void *addr) +{ + if (IS_ENABLED(CONFIG_MODULES) && is_vmalloc_or_module_addr(addr)) + return vmalloc_to_pfn(addr); + else + return __pa_symbol(addr) >> PAGE_SHIFT; } /* @@ -85,24 +107,12 @@ void __init poking_init(void) */ static int map_patch_area(void *addr, unsigned long text_poke_addr) { - unsigned long pfn; - int err; - - if (is_vmalloc_or_module_addr(addr)) - pfn = vmalloc_to_pfn(addr); - else - pfn = __pa_symbol(addr) >> PAGE_SHIFT; - - err = map_kernel_page(text_poke_addr, (pfn << PAGE_SHIFT), PAGE_KERNEL); + unsigned long pfn = get_patch_pfn(addr); - pr_devel("Mapped addr %lx with pfn %lx:%d\n", text_poke_addr, pfn, err); - if (err) - return -1; - - return 0; + return map_kernel_page(text_poke_addr, (pfn << PAGE_SHIFT), PAGE_KERNEL); } -static inline int unmap_patch_area(unsigned long addr) +static void unmap_patch_area(unsigned long addr) { pte_t *ptep; pmd_t *pmdp; @@ -111,133 +121,112 @@ static inline int unmap_patch_area(unsigned long addr) pgd_t *pgdp; pgdp = pgd_offset_k(addr); - if (unlikely(!pgdp)) - return -EINVAL; + if (WARN_ON(pgd_none(*pgdp))) + return; p4dp = p4d_offset(pgdp, addr); - if (unlikely(!p4dp)) - return -EINVAL; + if (WARN_ON(p4d_none(*p4dp))) + return; pudp = pud_offset(p4dp, addr); - if (unlikely(!pudp)) - return -EINVAL; + if (WARN_ON(pud_none(*pudp))) + return; pmdp = pmd_offset(pudp, addr); - if (unlikely(!pmdp)) - return -EINVAL; + if (WARN_ON(pmd_none(*pmdp))) + return; 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); + if (WARN_ON(pte_none(*ptep))) + return; /* * 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; +static int __do_patch_instruction(u32 *addr, ppc_inst_t instr) +{ + int err; + u32 *patch_addr; + unsigned long text_poke_addr; + pte_t *pte; + unsigned long pfn = get_patch_pfn(addr); + + text_poke_addr = (unsigned long)__this_cpu_read(text_poke_area)->addr & PAGE_MASK; + patch_addr = (u32 *)(text_poke_addr + offset_in_page(addr)); + + pte = virt_to_kpte(text_poke_addr); + __set_pte_at(&init_mm, text_poke_addr, pte, pfn_pte(pfn, PAGE_KERNEL), 0); + /* See ptesync comment in radix__set_pte_at() */ + if (radix_enabled()) + asm volatile("ptesync": : :"memory"); + + err = __patch_instruction(addr, instr, patch_addr); + + pte_clear(&init_mm, text_poke_addr, pte); + flush_tlb_kernel_range(text_poke_addr, text_poke_addr + PAGE_SIZE); + + return err; } -static int do_patch_instruction(u32 *addr, struct ppc_inst instr) +static int do_patch_instruction(u32 *addr, ppc_inst_t instr) { int err; - u32 *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)) + if (!static_branch_likely(&poking_init_done)) 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 = (u32 *)(text_poke_addr + (kaddr & ~PAGE_MASK)); - - __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: + err = __do_patch_instruction(addr, instr); local_irq_restore(flags); return err; } #else /* !CONFIG_STRICT_KERNEL_RWX */ -static int do_patch_instruction(u32 *addr, struct ppc_inst instr) +static int do_patch_instruction(u32 *addr, ppc_inst_t instr) { return raw_patch_instruction(addr, instr); } #endif /* CONFIG_STRICT_KERNEL_RWX */ -int patch_instruction(u32 *addr, struct ppc_inst instr) +__ro_after_init DEFINE_STATIC_KEY_FALSE(init_mem_is_free); + +int patch_instruction(u32 *addr, ppc_inst_t instr) { /* Make sure we aren't patching a freed init section */ - if (init_mem_is_free && init_section_contains(addr, 4)) { - pr_debug("Skipping init section patching addr: 0x%px\n", addr); + if (static_branch_likely(&init_mem_is_free) && init_section_contains(addr, 4)) return 0; - } + return do_patch_instruction(addr, instr); } NOKPROBE_SYMBOL(patch_instruction); int patch_branch(u32 *addr, unsigned long target, int flags) { - struct ppc_inst instr; + ppc_inst_t instr; - create_branch(&instr, addr, target, flags); - return patch_instruction(addr, instr); -} - -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)); -} + if (create_branch(&instr, addr, target, flags)) + return -ERANGE; -bool is_offset_in_cond_branch_range(long offset) -{ - return offset >= -0x8000 && offset <= 0x7fff && !(offset & 0x3); + return patch_instruction(addr, instr); } /* * Helper to check if a given instruction is a conditional branch * Derived from the conditional checks in analyse_instr() */ -bool is_conditional_branch(struct ppc_inst instr) +bool is_conditional_branch(ppc_inst_t instr) { unsigned int opcode = ppc_inst_primary_opcode(instr); @@ -255,27 +244,7 @@ bool is_conditional_branch(struct ppc_inst instr) } NOKPROBE_SYMBOL(is_conditional_branch); -int create_branch(struct ppc_inst *instr, const u32 *addr, - unsigned long target, int flags) -{ - long offset; - - *instr = ppc_inst(0); - 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 1; - - /* Mask out the flags and target, so they don't step on each other. */ - *instr = ppc_inst(0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC)); - - return 0; -} - -int create_cond_branch(struct ppc_inst *instr, const u32 *addr, +int create_cond_branch(ppc_inst_t *instr, const u32 *addr, unsigned long target, int flags) { long offset; @@ -294,22 +263,7 @@ int create_cond_branch(struct ppc_inst *instr, const u32 *addr, return 0; } -static unsigned int branch_opcode(struct ppc_inst instr) -{ - return ppc_inst_primary_opcode(instr) & 0x3F; -} - -static int instr_is_branch_iform(struct ppc_inst instr) -{ - return branch_opcode(instr) == 18; -} - -static int instr_is_branch_bform(struct ppc_inst instr) -{ - return branch_opcode(instr) == 16; -} - -int instr_is_relative_branch(struct ppc_inst instr) +int instr_is_relative_branch(ppc_inst_t instr) { if (ppc_inst_val(instr) & BRANCH_ABSOLUTE) return 0; @@ -317,7 +271,7 @@ int instr_is_relative_branch(struct ppc_inst instr) return instr_is_branch_iform(instr) || instr_is_branch_bform(instr); } -int instr_is_relative_link_branch(struct ppc_inst instr) +int instr_is_relative_link_branch(ppc_inst_t instr) { return instr_is_relative_branch(instr) && (ppc_inst_val(instr) & BRANCH_SET_LINK); } @@ -364,7 +318,7 @@ unsigned long branch_target(const u32 *instr) return 0; } -int translate_branch(struct ppc_inst *instr, const u32 *dest, const u32 *src) +int translate_branch(ppc_inst_t *instr, const u32 *dest, const u32 *src) { unsigned long target; target = branch_target(src); @@ -378,375 +332,3 @@ int translate_branch(struct ppc_inst *instr, const u32 *dest, const u32 *src) return 1; } - -#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 int instr_is_branch_to_addr(const u32 *instr, unsigned long addr) -{ - if (instr_is_branch_iform(ppc_inst_read(instr)) || - instr_is_branch_bform(ppc_inst_read(instr))) - return branch_target(instr) == addr; - - return 0; -} - -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) -{ - int err; - struct ppc_inst instr; - u32 tmp[2]; - u32 *iptr = tmp; - unsigned long addr = (unsigned long)tmp; - - /* The simplest case, branch to self, no flags */ - check(instr_is_branch_iform(ppc_inst(0x48000000))); - /* All bits of target set, and flags */ - check(instr_is_branch_iform(ppc_inst(0x4bffffff))); - /* High bit of opcode set, which is wrong */ - check(!instr_is_branch_iform(ppc_inst(0xcbffffff))); - /* Middle bits of opcode set, which is wrong */ - check(!instr_is_branch_iform(ppc_inst(0x7bffffff))); - - /* Simplest case, branch to self with link */ - check(instr_is_branch_iform(ppc_inst(0x48000001))); - /* All bits of targets set */ - check(instr_is_branch_iform(ppc_inst(0x4bfffffd))); - /* Some bits of targets set */ - check(instr_is_branch_iform(ppc_inst(0x4bff00fd))); - /* Must be a valid branch to start with */ - check(!instr_is_branch_iform(ppc_inst(0x7bfffffd))); - - /* Absolute branch to 0x100 */ - patch_instruction(iptr, ppc_inst(0x48000103)); - check(instr_is_branch_to_addr(iptr, 0x100)); - /* Absolute branch to 0x420fc */ - patch_instruction(iptr, ppc_inst(0x480420ff)); - check(instr_is_branch_to_addr(iptr, 0x420fc)); - /* Maximum positive relative branch, + 20MB - 4B */ - patch_instruction(iptr, ppc_inst(0x49fffffc)); - check(instr_is_branch_to_addr(iptr, addr + 0x1FFFFFC)); - /* Smallest negative relative branch, - 4B */ - patch_instruction(iptr, ppc_inst(0x4bfffffc)); - check(instr_is_branch_to_addr(iptr, addr - 4)); - /* Largest negative relative branch, - 32 MB */ - patch_instruction(iptr, ppc_inst(0x4a000000)); - check(instr_is_branch_to_addr(iptr, addr - 0x2000000)); - - /* Branch to self, with link */ - err = create_branch(&instr, iptr, addr, BRANCH_SET_LINK); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, addr)); - - /* Branch to self - 0x100, with link */ - err = create_branch(&instr, iptr, addr - 0x100, BRANCH_SET_LINK); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, addr - 0x100)); - - /* Branch to self + 0x100, no link */ - err = create_branch(&instr, iptr, addr + 0x100, 0); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, addr + 0x100)); - - /* Maximum relative negative offset, - 32 MB */ - err = create_branch(&instr, iptr, addr - 0x2000000, BRANCH_SET_LINK); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, addr - 0x2000000)); - - /* Out of range relative negative offset, - 32 MB + 4*/ - err = create_branch(&instr, iptr, addr - 0x2000004, BRANCH_SET_LINK); - check(err); - - /* Out of range relative positive offset, + 32 MB */ - err = create_branch(&instr, iptr, addr + 0x2000000, BRANCH_SET_LINK); - check(err); - - /* Unaligned target */ - err = create_branch(&instr, iptr, addr + 3, BRANCH_SET_LINK); - check(err); - - /* Check flags are masked correctly */ - err = create_branch(&instr, iptr, addr, 0xFFFFFFFC); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, addr)); - check(ppc_inst_equal(instr, ppc_inst(0x48000000))); -} - -static void __init test_create_function_call(void) -{ - u32 *iptr; - unsigned long dest; - struct ppc_inst instr; - - /* Check we can create a function call */ - iptr = (u32 *)ppc_function_entry(test_trampoline); - dest = ppc_function_entry(test_create_function_call); - create_branch(&instr, iptr, dest, BRANCH_SET_LINK); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, dest)); -} - -static void __init test_branch_bform(void) -{ - int err; - unsigned long addr; - struct ppc_inst instr; - u32 tmp[2]; - u32 *iptr = tmp; - unsigned int flags; - - addr = (unsigned long)iptr; - - /* The simplest case, branch to self, no flags */ - check(instr_is_branch_bform(ppc_inst(0x40000000))); - /* All bits of target set, and flags */ - check(instr_is_branch_bform(ppc_inst(0x43ffffff))); - /* High bit of opcode set, which is wrong */ - check(!instr_is_branch_bform(ppc_inst(0xc3ffffff))); - /* Middle bits of opcode set, which is wrong */ - check(!instr_is_branch_bform(ppc_inst(0x7bffffff))); - - /* Absolute conditional branch to 0x100 */ - patch_instruction(iptr, ppc_inst(0x43ff0103)); - check(instr_is_branch_to_addr(iptr, 0x100)); - /* Absolute conditional branch to 0x20fc */ - patch_instruction(iptr, ppc_inst(0x43ff20ff)); - check(instr_is_branch_to_addr(iptr, 0x20fc)); - /* Maximum positive relative conditional branch, + 32 KB - 4B */ - patch_instruction(iptr, ppc_inst(0x43ff7ffc)); - check(instr_is_branch_to_addr(iptr, addr + 0x7FFC)); - /* Smallest negative relative conditional branch, - 4B */ - patch_instruction(iptr, ppc_inst(0x43fffffc)); - check(instr_is_branch_to_addr(iptr, addr - 4)); - /* Largest negative relative conditional branch, - 32 KB */ - patch_instruction(iptr, ppc_inst(0x43ff8000)); - check(instr_is_branch_to_addr(iptr, addr - 0x8000)); - - /* All condition code bits set & link */ - flags = 0x3ff000 | BRANCH_SET_LINK; - - /* Branch to self */ - err = create_cond_branch(&instr, iptr, addr, flags); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, addr)); - - /* Branch to self - 0x100 */ - err = create_cond_branch(&instr, iptr, addr - 0x100, flags); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, addr - 0x100)); - - /* Branch to self + 0x100 */ - err = create_cond_branch(&instr, iptr, addr + 0x100, flags); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, addr + 0x100)); - - /* Maximum relative negative offset, - 32 KB */ - err = create_cond_branch(&instr, iptr, addr - 0x8000, flags); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, addr - 0x8000)); - - /* Out of range relative negative offset, - 32 KB + 4*/ - err = create_cond_branch(&instr, iptr, addr - 0x8004, flags); - check(err); - - /* Out of range relative positive offset, + 32 KB */ - err = create_cond_branch(&instr, iptr, addr + 0x8000, flags); - check(err); - - /* Unaligned target */ - err = create_cond_branch(&instr, iptr, addr + 3, flags); - check(err); - - /* Check flags are masked correctly */ - err = create_cond_branch(&instr, iptr, addr, 0xFFFFFFFC); - patch_instruction(iptr, instr); - check(instr_is_branch_to_addr(iptr, addr)); - check(ppc_inst_equal(instr, ppc_inst(0x43FF0000))); -} - -static void __init test_translate_branch(void) -{ - unsigned long addr; - void *p, *q; - struct ppc_inst instr; - 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 + 4; - translate_branch(&instr, q, p); - patch_instruction(q, instr); - 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; - translate_branch(&instr, q, p); - patch_instruction(q, instr); - check(instr_is_branch_to_addr(p, addr)); - check(instr_is_branch_to_addr(q, addr)); - check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(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; - translate_branch(&instr, q, p); - patch_instruction(q, instr); - check(instr_is_branch_to_addr(p, addr)); - check(instr_is_branch_to_addr(q, addr)); - check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(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; - translate_branch(&instr, q, p); - patch_instruction(q, instr); - 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; - translate_branch(&instr, q, p); - patch_instruction(q, instr); - 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; - create_cond_branch(&instr, p, addr, 0); - patch_instruction(p, instr); - check(instr_is_branch_to_addr(p, addr)); - q = buf + 4; - translate_branch(&instr, q, p); - patch_instruction(q, instr); - check(instr_is_branch_to_addr(q, addr)); - - /* Maximum negative case, move b . to addr + 32 KB */ - p = buf; - addr = (unsigned long)p; - create_cond_branch(&instr, p, addr, 0xFFFFFFFC); - patch_instruction(p, instr); - q = buf + 0x8000; - translate_branch(&instr, q, p); - patch_instruction(q, instr); - check(instr_is_branch_to_addr(p, addr)); - check(instr_is_branch_to_addr(q, addr)); - check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x43ff8000))); - - /* Maximum positive case, move x to x - 32 KB + 4 */ - p = buf + 0x8000; - addr = (unsigned long)p; - create_cond_branch(&instr, p, addr, 0xFFFFFFFC); - patch_instruction(p, instr); - q = buf + 4; - translate_branch(&instr, q, p); - patch_instruction(q, instr); - check(instr_is_branch_to_addr(p, addr)); - check(instr_is_branch_to_addr(q, addr)); - check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x43ff7ffc))); - - /* Jump to x + 12 KB moved to x + 20 KB */ - p = buf; - addr = 0x3000 + (unsigned long)buf; - create_cond_branch(&instr, p, addr, BRANCH_SET_LINK); - patch_instruction(p, instr); - q = buf + 0x5000; - translate_branch(&instr, q, p); - patch_instruction(q, instr); - 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; - create_cond_branch(&instr, p, addr, 0); - patch_instruction(p, instr); - q = buf + 4; - translate_branch(&instr, q, p); - patch_instruction(q, instr); - check(instr_is_branch_to_addr(p, addr)); - check(instr_is_branch_to_addr(q, addr)); - - /* Free the buffer we were using */ - vfree(buf); -} - -#ifdef CONFIG_PPC64 -static void __init test_prefixed_patching(void) -{ - extern unsigned int code_patching_test1[]; - extern unsigned int code_patching_test1_expected[]; - extern unsigned int end_code_patching_test1[]; - - __patch_instruction(code_patching_test1, - ppc_inst_prefix(OP_PREFIX << 26, 0x00000000), - code_patching_test1); - - check(!memcmp(code_patching_test1, - code_patching_test1_expected, - sizeof(unsigned int) * - (end_code_patching_test1 - code_patching_test1))); -} -#else -static inline void test_prefixed_patching(void) {} -#endif - -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(); - test_prefixed_patching(); - - return 0; -} -late_initcall(test_code_patching); - -#endif /* CONFIG_CODE_PATCHING_SELFTEST */ |