12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 2aaddd3eaSMichael Ellerman /* 3aaddd3eaSMichael Ellerman * Copyright 2008 Michael Ellerman, IBM Corporation. 4aaddd3eaSMichael Ellerman */ 5aaddd3eaSMichael Ellerman 6aaddd3eaSMichael Ellerman #include <linux/kernel.h> 771f6e58eSNaveen N. Rao #include <linux/kprobes.h> 8ae0dc736SMichael Ellerman #include <linux/vmalloc.h> 9ae0dc736SMichael Ellerman #include <linux/init.h> 1027ac792cSAndrea Righi #include <linux/mm.h> 1137bc3e5fSBalbir Singh #include <linux/cpuhotplug.h> 1237bc3e5fSBalbir Singh #include <linux/slab.h> 137c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 14aaddd3eaSMichael Ellerman 1537bc3e5fSBalbir Singh #include <asm/tlbflush.h> 1637bc3e5fSBalbir Singh #include <asm/page.h> 1737bc3e5fSBalbir Singh #include <asm/code-patching.h> 18252eb558SChristophe Leroy #include <asm/setup.h> 1975346251SJordan Niethe #include <asm/inst.h> 20aaddd3eaSMichael Ellerman 2169d4d6e5SChristophe Leroy static int __patch_instruction(u32 *exec_addr, struct ppc_inst instr, u32 *patch_addr) 22aaddd3eaSMichael Ellerman { 23e63ceebdSChristophe Leroy if (!ppc_inst_prefixed(instr)) { 24e63ceebdSChristophe Leroy u32 val = ppc_inst_val(instr); 25e63ceebdSChristophe Leroy 26e63ceebdSChristophe Leroy __put_kernel_nofault(patch_addr, &val, u32, failed); 27e63ceebdSChristophe Leroy } else { 28693557ebSChristophe Leroy u64 val = ppc_inst_as_ulong(instr); 29e63ceebdSChristophe Leroy 30e63ceebdSChristophe Leroy __put_kernel_nofault(patch_addr, &val, u64, failed); 31e63ceebdSChristophe Leroy } 3237bc3e5fSBalbir Singh 338cf4c057SChristophe Leroy asm ("dcbst 0, %0; sync; icbi 0,%1; sync; isync" :: "r" (patch_addr), 348cf4c057SChristophe Leroy "r" (exec_addr)); 3537bc3e5fSBalbir Singh 36b6e37968SSteven Rostedt return 0; 37e64ac41aSChristophe Leroy 38e64ac41aSChristophe Leroy failed: 39e64ac41aSChristophe Leroy return -EFAULT; 40aaddd3eaSMichael Ellerman } 41aaddd3eaSMichael Ellerman 4269d4d6e5SChristophe Leroy int raw_patch_instruction(u32 *addr, struct ppc_inst instr) 438cf4c057SChristophe Leroy { 448cf4c057SChristophe Leroy return __patch_instruction(addr, instr, addr); 458cf4c057SChristophe Leroy } 468cf4c057SChristophe Leroy 4737bc3e5fSBalbir Singh #ifdef CONFIG_STRICT_KERNEL_RWX 4837bc3e5fSBalbir Singh static DEFINE_PER_CPU(struct vm_struct *, text_poke_area); 4937bc3e5fSBalbir Singh 5037bc3e5fSBalbir Singh static int text_area_cpu_up(unsigned int cpu) 5137bc3e5fSBalbir Singh { 5237bc3e5fSBalbir Singh struct vm_struct *area; 5337bc3e5fSBalbir Singh 5437bc3e5fSBalbir Singh area = get_vm_area(PAGE_SIZE, VM_ALLOC); 5537bc3e5fSBalbir Singh if (!area) { 5637bc3e5fSBalbir Singh WARN_ONCE(1, "Failed to create text area for cpu %d\n", 5737bc3e5fSBalbir Singh cpu); 5837bc3e5fSBalbir Singh return -1; 5937bc3e5fSBalbir Singh } 6037bc3e5fSBalbir Singh this_cpu_write(text_poke_area, area); 6137bc3e5fSBalbir Singh 6237bc3e5fSBalbir Singh return 0; 6337bc3e5fSBalbir Singh } 6437bc3e5fSBalbir Singh 6537bc3e5fSBalbir Singh static int text_area_cpu_down(unsigned int cpu) 6637bc3e5fSBalbir Singh { 6737bc3e5fSBalbir Singh free_vm_area(this_cpu_read(text_poke_area)); 6837bc3e5fSBalbir Singh return 0; 6937bc3e5fSBalbir Singh } 7037bc3e5fSBalbir Singh 7137bc3e5fSBalbir Singh /* 7271a5b3dbSJordan Niethe * Although BUG_ON() is rude, in this case it should only happen if ENOMEM, and 7371a5b3dbSJordan Niethe * we judge it as being preferable to a kernel that will crash later when 7471a5b3dbSJordan Niethe * someone tries to use patch_instruction(). 7537bc3e5fSBalbir Singh */ 7671a5b3dbSJordan Niethe void __init poking_init(void) 7737bc3e5fSBalbir Singh { 7837bc3e5fSBalbir Singh BUG_ON(!cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, 7937bc3e5fSBalbir Singh "powerpc/text_poke:online", text_area_cpu_up, 8037bc3e5fSBalbir Singh text_area_cpu_down)); 8137bc3e5fSBalbir Singh } 8237bc3e5fSBalbir Singh 8337bc3e5fSBalbir Singh /* 8437bc3e5fSBalbir Singh * This can be called for kernel text or a module. 8537bc3e5fSBalbir Singh */ 8637bc3e5fSBalbir Singh static int map_patch_area(void *addr, unsigned long text_poke_addr) 8737bc3e5fSBalbir Singh { 8837bc3e5fSBalbir Singh unsigned long pfn; 8937bc3e5fSBalbir Singh int err; 9037bc3e5fSBalbir Singh 91ccc8fcf7SChristophe Leroy if (is_vmalloc_or_module_addr(addr)) 9237bc3e5fSBalbir Singh pfn = vmalloc_to_pfn(addr); 9337bc3e5fSBalbir Singh else 9437bc3e5fSBalbir Singh pfn = __pa_symbol(addr) >> PAGE_SHIFT; 9537bc3e5fSBalbir Singh 96c766ee72SChristophe Leroy err = map_kernel_page(text_poke_addr, (pfn << PAGE_SHIFT), PAGE_KERNEL); 9737bc3e5fSBalbir Singh 9837bc3e5fSBalbir Singh pr_devel("Mapped addr %lx with pfn %lx:%d\n", text_poke_addr, pfn, err); 9937bc3e5fSBalbir Singh if (err) 10037bc3e5fSBalbir Singh return -1; 10137bc3e5fSBalbir Singh 10237bc3e5fSBalbir Singh return 0; 10337bc3e5fSBalbir Singh } 10437bc3e5fSBalbir Singh 10537bc3e5fSBalbir Singh static inline int unmap_patch_area(unsigned long addr) 10637bc3e5fSBalbir Singh { 10737bc3e5fSBalbir Singh pte_t *ptep; 10837bc3e5fSBalbir Singh pmd_t *pmdp; 10937bc3e5fSBalbir Singh pud_t *pudp; 1102fb47060SMike Rapoport p4d_t *p4dp; 11137bc3e5fSBalbir Singh pgd_t *pgdp; 11237bc3e5fSBalbir Singh 11337bc3e5fSBalbir Singh pgdp = pgd_offset_k(addr); 11437bc3e5fSBalbir Singh if (unlikely(!pgdp)) 11537bc3e5fSBalbir Singh return -EINVAL; 11637bc3e5fSBalbir Singh 1172fb47060SMike Rapoport p4dp = p4d_offset(pgdp, addr); 1182fb47060SMike Rapoport if (unlikely(!p4dp)) 1192fb47060SMike Rapoport return -EINVAL; 1202fb47060SMike Rapoport 1212fb47060SMike Rapoport pudp = pud_offset(p4dp, addr); 12237bc3e5fSBalbir Singh if (unlikely(!pudp)) 12337bc3e5fSBalbir Singh return -EINVAL; 12437bc3e5fSBalbir Singh 12537bc3e5fSBalbir Singh pmdp = pmd_offset(pudp, addr); 12637bc3e5fSBalbir Singh if (unlikely(!pmdp)) 12737bc3e5fSBalbir Singh return -EINVAL; 12837bc3e5fSBalbir Singh 12937bc3e5fSBalbir Singh ptep = pte_offset_kernel(pmdp, addr); 13037bc3e5fSBalbir Singh if (unlikely(!ptep)) 13137bc3e5fSBalbir Singh return -EINVAL; 13237bc3e5fSBalbir Singh 13337bc3e5fSBalbir Singh pr_devel("clearing mm %p, pte %p, addr %lx\n", &init_mm, ptep, addr); 13437bc3e5fSBalbir Singh 13537bc3e5fSBalbir Singh /* 13637bc3e5fSBalbir Singh * In hash, pte_clear flushes the tlb, in radix, we have to 13737bc3e5fSBalbir Singh */ 13837bc3e5fSBalbir Singh pte_clear(&init_mm, addr, ptep); 13937bc3e5fSBalbir Singh flush_tlb_kernel_range(addr, addr + PAGE_SIZE); 14037bc3e5fSBalbir Singh 14137bc3e5fSBalbir Singh return 0; 14237bc3e5fSBalbir Singh } 14337bc3e5fSBalbir Singh 14469d4d6e5SChristophe Leroy static int do_patch_instruction(u32 *addr, struct ppc_inst instr) 14537bc3e5fSBalbir Singh { 14637bc3e5fSBalbir Singh int err; 14769d4d6e5SChristophe Leroy u32 *patch_addr = NULL; 14837bc3e5fSBalbir Singh unsigned long flags; 14937bc3e5fSBalbir Singh unsigned long text_poke_addr; 15037bc3e5fSBalbir Singh unsigned long kaddr = (unsigned long)addr; 15137bc3e5fSBalbir Singh 15237bc3e5fSBalbir Singh /* 15337bc3e5fSBalbir Singh * During early early boot patch_instruction is called 15437bc3e5fSBalbir Singh * when text_poke_area is not ready, but we still need 15537bc3e5fSBalbir Singh * to allow patching. We just do the plain old patching 15637bc3e5fSBalbir Singh */ 1578183d99fSChristophe Leroy if (!this_cpu_read(text_poke_area)) 1588cf4c057SChristophe Leroy return raw_patch_instruction(addr, instr); 15937bc3e5fSBalbir Singh 16037bc3e5fSBalbir Singh local_irq_save(flags); 16137bc3e5fSBalbir Singh 16237bc3e5fSBalbir Singh text_poke_addr = (unsigned long)__this_cpu_read(text_poke_area)->addr; 16337bc3e5fSBalbir Singh if (map_patch_area(addr, text_poke_addr)) { 16437bc3e5fSBalbir Singh err = -1; 16537bc3e5fSBalbir Singh goto out; 16637bc3e5fSBalbir Singh } 16737bc3e5fSBalbir Singh 16869d4d6e5SChristophe Leroy patch_addr = (u32 *)(text_poke_addr + (kaddr & ~PAGE_MASK)); 16937bc3e5fSBalbir Singh 1708cf4c057SChristophe Leroy __patch_instruction(addr, instr, patch_addr); 17137bc3e5fSBalbir Singh 17237bc3e5fSBalbir Singh err = unmap_patch_area(text_poke_addr); 17337bc3e5fSBalbir Singh if (err) 17437bc3e5fSBalbir Singh pr_warn("failed to unmap %lx\n", text_poke_addr); 17537bc3e5fSBalbir Singh 17637bc3e5fSBalbir Singh out: 17737bc3e5fSBalbir Singh local_irq_restore(flags); 17837bc3e5fSBalbir Singh 17937bc3e5fSBalbir Singh return err; 18037bc3e5fSBalbir Singh } 18137bc3e5fSBalbir Singh #else /* !CONFIG_STRICT_KERNEL_RWX */ 18237bc3e5fSBalbir Singh 18369d4d6e5SChristophe Leroy static int do_patch_instruction(u32 *addr, struct ppc_inst instr) 18437bc3e5fSBalbir Singh { 1858cf4c057SChristophe Leroy return raw_patch_instruction(addr, instr); 18637bc3e5fSBalbir Singh } 18737bc3e5fSBalbir Singh 18837bc3e5fSBalbir Singh #endif /* CONFIG_STRICT_KERNEL_RWX */ 189b45ba4a5SChristophe Leroy 19069d4d6e5SChristophe Leroy int patch_instruction(u32 *addr, struct ppc_inst instr) 191b45ba4a5SChristophe Leroy { 192b45ba4a5SChristophe Leroy /* Make sure we aren't patching a freed init section */ 193b45ba4a5SChristophe Leroy if (init_mem_is_free && init_section_contains(addr, 4)) { 194b45ba4a5SChristophe Leroy pr_debug("Skipping init section patching addr: 0x%px\n", addr); 195b45ba4a5SChristophe Leroy return 0; 196b45ba4a5SChristophe Leroy } 197b45ba4a5SChristophe Leroy return do_patch_instruction(addr, instr); 198b45ba4a5SChristophe Leroy } 19937bc3e5fSBalbir Singh NOKPROBE_SYMBOL(patch_instruction); 20037bc3e5fSBalbir Singh 20169d4d6e5SChristophe Leroy int patch_branch(u32 *addr, unsigned long target, int flags) 202e7a57273SMichael Ellerman { 20394afd069SJordan Niethe struct ppc_inst instr; 2047c95d889SJordan Niethe 2057c95d889SJordan Niethe create_branch(&instr, addr, target, flags); 2067c95d889SJordan Niethe return patch_instruction(addr, instr); 207e7a57273SMichael Ellerman } 208e7a57273SMichael Ellerman 209ebfa50dfSAnju T bool is_offset_in_branch_range(long offset) 210ebfa50dfSAnju T { 211ebfa50dfSAnju T /* 212ebfa50dfSAnju T * Powerpc branch instruction is : 213ebfa50dfSAnju T * 214ebfa50dfSAnju T * 0 6 30 31 215ebfa50dfSAnju T * +---------+----------------+---+---+ 216ebfa50dfSAnju T * | opcode | LI |AA |LK | 217ebfa50dfSAnju T * +---------+----------------+---+---+ 218ebfa50dfSAnju T * Where AA = 0 and LK = 0 219ebfa50dfSAnju T * 220ebfa50dfSAnju T * LI is a signed 24 bits integer. The real branch offset is computed 221ebfa50dfSAnju T * by: imm32 = SignExtend(LI:'0b00', 32); 222ebfa50dfSAnju T * 223ebfa50dfSAnju T * So the maximum forward branch should be: 224ebfa50dfSAnju T * (0x007fffff << 2) = 0x01fffffc = 0x1fffffc 225ebfa50dfSAnju T * The maximum backward branch should be: 226ebfa50dfSAnju T * (0xff800000 << 2) = 0xfe000000 = -0x2000000 227ebfa50dfSAnju T */ 228ebfa50dfSAnju T return (offset >= -0x2000000 && offset <= 0x1fffffc && !(offset & 0x3)); 229ebfa50dfSAnju T } 230ebfa50dfSAnju T 231*4549c3eaSNaveen N. Rao bool is_offset_in_cond_branch_range(long offset) 232*4549c3eaSNaveen N. Rao { 233*4549c3eaSNaveen N. Rao return offset >= -0x8000 && offset <= 0x7fff && !(offset & 0x3); 234*4549c3eaSNaveen N. Rao } 235*4549c3eaSNaveen N. Rao 23651c9c084SAnju T /* 23751c9c084SAnju T * Helper to check if a given instruction is a conditional branch 23851c9c084SAnju T * Derived from the conditional checks in analyse_instr() 23951c9c084SAnju T */ 24094afd069SJordan Niethe bool is_conditional_branch(struct ppc_inst instr) 24151c9c084SAnju T { 2428094892dSJordan Niethe unsigned int opcode = ppc_inst_primary_opcode(instr); 24351c9c084SAnju T 24451c9c084SAnju T if (opcode == 16) /* bc, bca, bcl, bcla */ 24551c9c084SAnju T return true; 24651c9c084SAnju T if (opcode == 19) { 247777e26f0SJordan Niethe switch ((ppc_inst_val(instr) >> 1) & 0x3ff) { 24851c9c084SAnju T case 16: /* bclr, bclrl */ 24951c9c084SAnju T case 528: /* bcctr, bcctrl */ 25051c9c084SAnju T case 560: /* bctar, bctarl */ 25151c9c084SAnju T return true; 25251c9c084SAnju T } 25351c9c084SAnju T } 25451c9c084SAnju T return false; 25551c9c084SAnju T } 25671f6e58eSNaveen N. Rao NOKPROBE_SYMBOL(is_conditional_branch); 25751c9c084SAnju T 25869d4d6e5SChristophe Leroy int create_branch(struct ppc_inst *instr, const u32 *addr, 259e7a57273SMichael Ellerman unsigned long target, int flags) 260aaddd3eaSMichael Ellerman { 261053a858eSMichael Ellerman long offset; 262aaddd3eaSMichael Ellerman 26394afd069SJordan Niethe *instr = ppc_inst(0); 264053a858eSMichael Ellerman offset = target; 265aaddd3eaSMichael Ellerman if (! (flags & BRANCH_ABSOLUTE)) 266053a858eSMichael Ellerman offset = offset - (unsigned long)addr; 267053a858eSMichael Ellerman 268053a858eSMichael Ellerman /* Check we can represent the target in the instruction format */ 269ebfa50dfSAnju T if (!is_offset_in_branch_range(offset)) 2707c95d889SJordan Niethe return 1; 271aaddd3eaSMichael Ellerman 272aaddd3eaSMichael Ellerman /* Mask out the flags and target, so they don't step on each other. */ 27394afd069SJordan Niethe *instr = ppc_inst(0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC)); 274aaddd3eaSMichael Ellerman 2757c95d889SJordan Niethe return 0; 276aaddd3eaSMichael Ellerman } 277411781a2SMichael Ellerman 27869d4d6e5SChristophe Leroy int create_cond_branch(struct ppc_inst *instr, const u32 *addr, 279411781a2SMichael Ellerman unsigned long target, int flags) 280411781a2SMichael Ellerman { 281411781a2SMichael Ellerman long offset; 282411781a2SMichael Ellerman 283411781a2SMichael Ellerman offset = target; 284411781a2SMichael Ellerman if (! (flags & BRANCH_ABSOLUTE)) 285411781a2SMichael Ellerman offset = offset - (unsigned long)addr; 286411781a2SMichael Ellerman 287411781a2SMichael Ellerman /* Check we can represent the target in the instruction format */ 288*4549c3eaSNaveen N. Rao if (!is_offset_in_cond_branch_range(offset)) 2897c95d889SJordan Niethe return 1; 290411781a2SMichael Ellerman 291411781a2SMichael Ellerman /* Mask out the flags and target, so they don't step on each other. */ 29294afd069SJordan Niethe *instr = ppc_inst(0x40000000 | (flags & 0x3FF0003) | (offset & 0xFFFC)); 293411781a2SMichael Ellerman 2947c95d889SJordan Niethe return 0; 295411781a2SMichael Ellerman } 296411781a2SMichael Ellerman 29794afd069SJordan Niethe static unsigned int branch_opcode(struct ppc_inst instr) 298411781a2SMichael Ellerman { 2998094892dSJordan Niethe return ppc_inst_primary_opcode(instr) & 0x3F; 300411781a2SMichael Ellerman } 301411781a2SMichael Ellerman 30294afd069SJordan Niethe static int instr_is_branch_iform(struct ppc_inst instr) 303411781a2SMichael Ellerman { 304411781a2SMichael Ellerman return branch_opcode(instr) == 18; 305411781a2SMichael Ellerman } 306411781a2SMichael Ellerman 30794afd069SJordan Niethe static int instr_is_branch_bform(struct ppc_inst instr) 308411781a2SMichael Ellerman { 309411781a2SMichael Ellerman return branch_opcode(instr) == 16; 310411781a2SMichael Ellerman } 311411781a2SMichael Ellerman 31294afd069SJordan Niethe int instr_is_relative_branch(struct ppc_inst instr) 313411781a2SMichael Ellerman { 314777e26f0SJordan Niethe if (ppc_inst_val(instr) & BRANCH_ABSOLUTE) 315411781a2SMichael Ellerman return 0; 316411781a2SMichael Ellerman 317411781a2SMichael Ellerman return instr_is_branch_iform(instr) || instr_is_branch_bform(instr); 318411781a2SMichael Ellerman } 319411781a2SMichael Ellerman 32094afd069SJordan Niethe int instr_is_relative_link_branch(struct ppc_inst instr) 321b9eab08dSJosh Poimboeuf { 322777e26f0SJordan Niethe return instr_is_relative_branch(instr) && (ppc_inst_val(instr) & BRANCH_SET_LINK); 323b9eab08dSJosh Poimboeuf } 324b9eab08dSJosh Poimboeuf 32569d4d6e5SChristophe Leroy static unsigned long branch_iform_target(const u32 *instr) 326411781a2SMichael Ellerman { 327411781a2SMichael Ellerman signed long imm; 328411781a2SMichael Ellerman 32918c85964SChristophe Leroy imm = ppc_inst_val(ppc_inst_read(instr)) & 0x3FFFFFC; 330411781a2SMichael Ellerman 331411781a2SMichael Ellerman /* If the top bit of the immediate value is set this is negative */ 332411781a2SMichael Ellerman if (imm & 0x2000000) 333411781a2SMichael Ellerman imm -= 0x4000000; 334411781a2SMichael Ellerman 33518c85964SChristophe Leroy if ((ppc_inst_val(ppc_inst_read(instr)) & BRANCH_ABSOLUTE) == 0) 336411781a2SMichael Ellerman imm += (unsigned long)instr; 337411781a2SMichael Ellerman 338411781a2SMichael Ellerman return (unsigned long)imm; 339411781a2SMichael Ellerman } 340411781a2SMichael Ellerman 34169d4d6e5SChristophe Leroy static unsigned long branch_bform_target(const u32 *instr) 342411781a2SMichael Ellerman { 343411781a2SMichael Ellerman signed long imm; 344411781a2SMichael Ellerman 34518c85964SChristophe Leroy imm = ppc_inst_val(ppc_inst_read(instr)) & 0xFFFC; 346411781a2SMichael Ellerman 347411781a2SMichael Ellerman /* If the top bit of the immediate value is set this is negative */ 348411781a2SMichael Ellerman if (imm & 0x8000) 349411781a2SMichael Ellerman imm -= 0x10000; 350411781a2SMichael Ellerman 35118c85964SChristophe Leroy if ((ppc_inst_val(ppc_inst_read(instr)) & BRANCH_ABSOLUTE) == 0) 352411781a2SMichael Ellerman imm += (unsigned long)instr; 353411781a2SMichael Ellerman 354411781a2SMichael Ellerman return (unsigned long)imm; 355411781a2SMichael Ellerman } 356411781a2SMichael Ellerman 35769d4d6e5SChristophe Leroy unsigned long branch_target(const u32 *instr) 358411781a2SMichael Ellerman { 359f8faaffaSJordan Niethe if (instr_is_branch_iform(ppc_inst_read(instr))) 360411781a2SMichael Ellerman return branch_iform_target(instr); 361f8faaffaSJordan Niethe else if (instr_is_branch_bform(ppc_inst_read(instr))) 362411781a2SMichael Ellerman return branch_bform_target(instr); 363411781a2SMichael Ellerman 364411781a2SMichael Ellerman return 0; 365411781a2SMichael Ellerman } 366411781a2SMichael Ellerman 36769d4d6e5SChristophe Leroy int translate_branch(struct ppc_inst *instr, const u32 *dest, const u32 *src) 368411781a2SMichael Ellerman { 369411781a2SMichael Ellerman unsigned long target; 370411781a2SMichael Ellerman target = branch_target(src); 371411781a2SMichael Ellerman 372f8faaffaSJordan Niethe if (instr_is_branch_iform(ppc_inst_read(src))) 373f8faaffaSJordan Niethe return create_branch(instr, dest, target, 374f8faaffaSJordan Niethe ppc_inst_val(ppc_inst_read(src))); 375f8faaffaSJordan Niethe else if (instr_is_branch_bform(ppc_inst_read(src))) 376f8faaffaSJordan Niethe return create_cond_branch(instr, dest, target, 377f8faaffaSJordan Niethe ppc_inst_val(ppc_inst_read(src))); 378411781a2SMichael Ellerman 3797c95d889SJordan Niethe return 1; 380411781a2SMichael Ellerman } 381ae0dc736SMichael Ellerman 3821e8341aeSKevin Hao #ifdef CONFIG_PPC_BOOK3E_64 3831e8341aeSKevin Hao void __patch_exception(int exc, unsigned long addr) 3841e8341aeSKevin Hao { 3851e8341aeSKevin Hao extern unsigned int interrupt_base_book3e; 3861e8341aeSKevin Hao unsigned int *ibase = &interrupt_base_book3e; 3871e8341aeSKevin Hao 3881e8341aeSKevin Hao /* Our exceptions vectors start with a NOP and -then- a branch 3891e8341aeSKevin Hao * to deal with single stepping from userspace which stops on 3901e8341aeSKevin Hao * the second instruction. Thus we need to patch the second 3911e8341aeSKevin Hao * instruction of the exception, not the first one 3921e8341aeSKevin Hao */ 3931e8341aeSKevin Hao 39469d4d6e5SChristophe Leroy patch_branch(ibase + (exc / 4) + 1, addr, 0); 3951e8341aeSKevin Hao } 3961e8341aeSKevin Hao #endif 397ae0dc736SMichael Ellerman 398ae0dc736SMichael Ellerman #ifdef CONFIG_CODE_PATCHING_SELFTEST 399ae0dc736SMichael Ellerman 40069d4d6e5SChristophe Leroy static int instr_is_branch_to_addr(const u32 *instr, unsigned long addr) 4016c0d181dSChristophe Leroy { 4026c0d181dSChristophe Leroy if (instr_is_branch_iform(ppc_inst_read(instr)) || 4036c0d181dSChristophe Leroy instr_is_branch_bform(ppc_inst_read(instr))) 4046c0d181dSChristophe Leroy return branch_target(instr) == addr; 4056c0d181dSChristophe Leroy 4066c0d181dSChristophe Leroy return 0; 4076c0d181dSChristophe Leroy } 4086c0d181dSChristophe Leroy 409ae0dc736SMichael Ellerman static void __init test_trampoline(void) 410ae0dc736SMichael Ellerman { 411ae0dc736SMichael Ellerman asm ("nop;\n"); 412ae0dc736SMichael Ellerman } 413ae0dc736SMichael Ellerman 414ae0dc736SMichael Ellerman #define check(x) \ 415ae0dc736SMichael Ellerman if (!(x)) printk("code-patching: test failed at line %d\n", __LINE__); 416ae0dc736SMichael Ellerman 417ae0dc736SMichael Ellerman static void __init test_branch_iform(void) 418ae0dc736SMichael Ellerman { 4197c95d889SJordan Niethe int err; 42094afd069SJordan Niethe struct ppc_inst instr; 421e90a21eaSChristophe Leroy u32 tmp[2]; 42269d4d6e5SChristophe Leroy u32 *iptr = tmp; 423e90a21eaSChristophe Leroy unsigned long addr = (unsigned long)tmp; 424ae0dc736SMichael Ellerman 425ae0dc736SMichael Ellerman /* The simplest case, branch to self, no flags */ 42675346251SJordan Niethe check(instr_is_branch_iform(ppc_inst(0x48000000))); 427ae0dc736SMichael Ellerman /* All bits of target set, and flags */ 42875346251SJordan Niethe check(instr_is_branch_iform(ppc_inst(0x4bffffff))); 429ae0dc736SMichael Ellerman /* High bit of opcode set, which is wrong */ 43075346251SJordan Niethe check(!instr_is_branch_iform(ppc_inst(0xcbffffff))); 431ae0dc736SMichael Ellerman /* Middle bits of opcode set, which is wrong */ 43275346251SJordan Niethe check(!instr_is_branch_iform(ppc_inst(0x7bffffff))); 433ae0dc736SMichael Ellerman 434ae0dc736SMichael Ellerman /* Simplest case, branch to self with link */ 43575346251SJordan Niethe check(instr_is_branch_iform(ppc_inst(0x48000001))); 436ae0dc736SMichael Ellerman /* All bits of targets set */ 43775346251SJordan Niethe check(instr_is_branch_iform(ppc_inst(0x4bfffffd))); 438ae0dc736SMichael Ellerman /* Some bits of targets set */ 43975346251SJordan Niethe check(instr_is_branch_iform(ppc_inst(0x4bff00fd))); 440ae0dc736SMichael Ellerman /* Must be a valid branch to start with */ 44175346251SJordan Niethe check(!instr_is_branch_iform(ppc_inst(0x7bfffffd))); 442ae0dc736SMichael Ellerman 443ae0dc736SMichael Ellerman /* Absolute branch to 0x100 */ 444e90a21eaSChristophe Leroy patch_instruction(iptr, ppc_inst(0x48000103)); 445e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, 0x100)); 446ae0dc736SMichael Ellerman /* Absolute branch to 0x420fc */ 447e90a21eaSChristophe Leroy patch_instruction(iptr, ppc_inst(0x480420ff)); 448e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, 0x420fc)); 449ae0dc736SMichael Ellerman /* Maximum positive relative branch, + 20MB - 4B */ 450e90a21eaSChristophe Leroy patch_instruction(iptr, ppc_inst(0x49fffffc)); 451e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr + 0x1FFFFFC)); 452ae0dc736SMichael Ellerman /* Smallest negative relative branch, - 4B */ 453e90a21eaSChristophe Leroy patch_instruction(iptr, ppc_inst(0x4bfffffc)); 454e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr - 4)); 455ae0dc736SMichael Ellerman /* Largest negative relative branch, - 32 MB */ 456e90a21eaSChristophe Leroy patch_instruction(iptr, ppc_inst(0x4a000000)); 457e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr - 0x2000000)); 458ae0dc736SMichael Ellerman 459ae0dc736SMichael Ellerman /* Branch to self, with link */ 460e90a21eaSChristophe Leroy err = create_branch(&instr, iptr, addr, BRANCH_SET_LINK); 461e90a21eaSChristophe Leroy patch_instruction(iptr, instr); 462e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr)); 463ae0dc736SMichael Ellerman 464ae0dc736SMichael Ellerman /* Branch to self - 0x100, with link */ 465e90a21eaSChristophe Leroy err = create_branch(&instr, iptr, addr - 0x100, BRANCH_SET_LINK); 466e90a21eaSChristophe Leroy patch_instruction(iptr, instr); 467e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr - 0x100)); 468ae0dc736SMichael Ellerman 469ae0dc736SMichael Ellerman /* Branch to self + 0x100, no link */ 470e90a21eaSChristophe Leroy err = create_branch(&instr, iptr, addr + 0x100, 0); 471e90a21eaSChristophe Leroy patch_instruction(iptr, instr); 472e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr + 0x100)); 473ae0dc736SMichael Ellerman 474ae0dc736SMichael Ellerman /* Maximum relative negative offset, - 32 MB */ 475e90a21eaSChristophe Leroy err = create_branch(&instr, iptr, addr - 0x2000000, BRANCH_SET_LINK); 476e90a21eaSChristophe Leroy patch_instruction(iptr, instr); 477e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr - 0x2000000)); 478ae0dc736SMichael Ellerman 479ae0dc736SMichael Ellerman /* Out of range relative negative offset, - 32 MB + 4*/ 480e90a21eaSChristophe Leroy err = create_branch(&instr, iptr, addr - 0x2000004, BRANCH_SET_LINK); 4817c95d889SJordan Niethe check(err); 482ae0dc736SMichael Ellerman 483ae0dc736SMichael Ellerman /* Out of range relative positive offset, + 32 MB */ 484e90a21eaSChristophe Leroy err = create_branch(&instr, iptr, addr + 0x2000000, BRANCH_SET_LINK); 4857c95d889SJordan Niethe check(err); 486ae0dc736SMichael Ellerman 487ae0dc736SMichael Ellerman /* Unaligned target */ 488e90a21eaSChristophe Leroy err = create_branch(&instr, iptr, addr + 3, BRANCH_SET_LINK); 4897c95d889SJordan Niethe check(err); 490ae0dc736SMichael Ellerman 491ae0dc736SMichael Ellerman /* Check flags are masked correctly */ 492e90a21eaSChristophe Leroy err = create_branch(&instr, iptr, addr, 0xFFFFFFFC); 493e90a21eaSChristophe Leroy patch_instruction(iptr, instr); 494e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr)); 495217862d9SJordan Niethe check(ppc_inst_equal(instr, ppc_inst(0x48000000))); 496ae0dc736SMichael Ellerman } 497ae0dc736SMichael Ellerman 498ae0dc736SMichael Ellerman static void __init test_create_function_call(void) 499ae0dc736SMichael Ellerman { 50069d4d6e5SChristophe Leroy u32 *iptr; 501ae0dc736SMichael Ellerman unsigned long dest; 50294afd069SJordan Niethe struct ppc_inst instr; 503ae0dc736SMichael Ellerman 504ae0dc736SMichael Ellerman /* Check we can create a function call */ 50569d4d6e5SChristophe Leroy iptr = (u32 *)ppc_function_entry(test_trampoline); 506ae0dc736SMichael Ellerman dest = ppc_function_entry(test_create_function_call); 5077c95d889SJordan Niethe create_branch(&instr, iptr, dest, BRANCH_SET_LINK); 5087c95d889SJordan Niethe patch_instruction(iptr, instr); 509ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(iptr, dest)); 510ae0dc736SMichael Ellerman } 511ae0dc736SMichael Ellerman 512ae0dc736SMichael Ellerman static void __init test_branch_bform(void) 513ae0dc736SMichael Ellerman { 5147c95d889SJordan Niethe int err; 515ae0dc736SMichael Ellerman unsigned long addr; 51669d4d6e5SChristophe Leroy struct ppc_inst instr; 517e90a21eaSChristophe Leroy u32 tmp[2]; 51869d4d6e5SChristophe Leroy u32 *iptr = tmp; 51994afd069SJordan Niethe unsigned int flags; 520ae0dc736SMichael Ellerman 521ae0dc736SMichael Ellerman addr = (unsigned long)iptr; 522ae0dc736SMichael Ellerman 523ae0dc736SMichael Ellerman /* The simplest case, branch to self, no flags */ 52475346251SJordan Niethe check(instr_is_branch_bform(ppc_inst(0x40000000))); 525ae0dc736SMichael Ellerman /* All bits of target set, and flags */ 52675346251SJordan Niethe check(instr_is_branch_bform(ppc_inst(0x43ffffff))); 527ae0dc736SMichael Ellerman /* High bit of opcode set, which is wrong */ 52875346251SJordan Niethe check(!instr_is_branch_bform(ppc_inst(0xc3ffffff))); 529ae0dc736SMichael Ellerman /* Middle bits of opcode set, which is wrong */ 53075346251SJordan Niethe check(!instr_is_branch_bform(ppc_inst(0x7bffffff))); 531ae0dc736SMichael Ellerman 532ae0dc736SMichael Ellerman /* Absolute conditional branch to 0x100 */ 533e90a21eaSChristophe Leroy patch_instruction(iptr, ppc_inst(0x43ff0103)); 534e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, 0x100)); 535ae0dc736SMichael Ellerman /* Absolute conditional branch to 0x20fc */ 536e90a21eaSChristophe Leroy patch_instruction(iptr, ppc_inst(0x43ff20ff)); 537e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, 0x20fc)); 538ae0dc736SMichael Ellerman /* Maximum positive relative conditional branch, + 32 KB - 4B */ 539e90a21eaSChristophe Leroy patch_instruction(iptr, ppc_inst(0x43ff7ffc)); 540e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr + 0x7FFC)); 541ae0dc736SMichael Ellerman /* Smallest negative relative conditional branch, - 4B */ 542e90a21eaSChristophe Leroy patch_instruction(iptr, ppc_inst(0x43fffffc)); 543e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr - 4)); 544ae0dc736SMichael Ellerman /* Largest negative relative conditional branch, - 32 KB */ 545e90a21eaSChristophe Leroy patch_instruction(iptr, ppc_inst(0x43ff8000)); 546e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr - 0x8000)); 547ae0dc736SMichael Ellerman 548ae0dc736SMichael Ellerman /* All condition code bits set & link */ 549ae0dc736SMichael Ellerman flags = 0x3ff000 | BRANCH_SET_LINK; 550ae0dc736SMichael Ellerman 551ae0dc736SMichael Ellerman /* Branch to self */ 5527c95d889SJordan Niethe err = create_cond_branch(&instr, iptr, addr, flags); 553e90a21eaSChristophe Leroy patch_instruction(iptr, instr); 554e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr)); 555ae0dc736SMichael Ellerman 556ae0dc736SMichael Ellerman /* Branch to self - 0x100 */ 5577c95d889SJordan Niethe err = create_cond_branch(&instr, iptr, addr - 0x100, flags); 558e90a21eaSChristophe Leroy patch_instruction(iptr, instr); 559e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr - 0x100)); 560ae0dc736SMichael Ellerman 561ae0dc736SMichael Ellerman /* Branch to self + 0x100 */ 5627c95d889SJordan Niethe err = create_cond_branch(&instr, iptr, addr + 0x100, flags); 563e90a21eaSChristophe Leroy patch_instruction(iptr, instr); 564e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr + 0x100)); 565ae0dc736SMichael Ellerman 566ae0dc736SMichael Ellerman /* Maximum relative negative offset, - 32 KB */ 5677c95d889SJordan Niethe err = create_cond_branch(&instr, iptr, addr - 0x8000, flags); 568e90a21eaSChristophe Leroy patch_instruction(iptr, instr); 569e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr - 0x8000)); 570ae0dc736SMichael Ellerman 571ae0dc736SMichael Ellerman /* Out of range relative negative offset, - 32 KB + 4*/ 5727c95d889SJordan Niethe err = create_cond_branch(&instr, iptr, addr - 0x8004, flags); 5737c95d889SJordan Niethe check(err); 574ae0dc736SMichael Ellerman 575ae0dc736SMichael Ellerman /* Out of range relative positive offset, + 32 KB */ 5767c95d889SJordan Niethe err = create_cond_branch(&instr, iptr, addr + 0x8000, flags); 5777c95d889SJordan Niethe check(err); 578ae0dc736SMichael Ellerman 579ae0dc736SMichael Ellerman /* Unaligned target */ 5807c95d889SJordan Niethe err = create_cond_branch(&instr, iptr, addr + 3, flags); 5817c95d889SJordan Niethe check(err); 582ae0dc736SMichael Ellerman 583ae0dc736SMichael Ellerman /* Check flags are masked correctly */ 5847c95d889SJordan Niethe err = create_cond_branch(&instr, iptr, addr, 0xFFFFFFFC); 585e90a21eaSChristophe Leroy patch_instruction(iptr, instr); 586e90a21eaSChristophe Leroy check(instr_is_branch_to_addr(iptr, addr)); 587217862d9SJordan Niethe check(ppc_inst_equal(instr, ppc_inst(0x43FF0000))); 588ae0dc736SMichael Ellerman } 589ae0dc736SMichael Ellerman 590ae0dc736SMichael Ellerman static void __init test_translate_branch(void) 591ae0dc736SMichael Ellerman { 592ae0dc736SMichael Ellerman unsigned long addr; 5930b582db5SJordan Niethe void *p, *q; 59494afd069SJordan Niethe struct ppc_inst instr; 595ae0dc736SMichael Ellerman void *buf; 596ae0dc736SMichael Ellerman 597ae0dc736SMichael Ellerman buf = vmalloc(PAGE_ALIGN(0x2000000 + 1)); 598ae0dc736SMichael Ellerman check(buf); 599ae0dc736SMichael Ellerman if (!buf) 600ae0dc736SMichael Ellerman return; 601ae0dc736SMichael Ellerman 602ae0dc736SMichael Ellerman /* Simple case, branch to self moved a little */ 603ae0dc736SMichael Ellerman p = buf; 604ae0dc736SMichael Ellerman addr = (unsigned long)p; 605ae0dc736SMichael Ellerman patch_branch(p, addr, 0); 606ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(p, addr)); 6070b582db5SJordan Niethe q = p + 4; 6087c95d889SJordan Niethe translate_branch(&instr, q, p); 6097c95d889SJordan Niethe patch_instruction(q, instr); 610ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(q, addr)); 611ae0dc736SMichael Ellerman 612ae0dc736SMichael Ellerman /* Maximum negative case, move b . to addr + 32 MB */ 613ae0dc736SMichael Ellerman p = buf; 614ae0dc736SMichael Ellerman addr = (unsigned long)p; 615ae0dc736SMichael Ellerman patch_branch(p, addr, 0); 616ae0dc736SMichael Ellerman q = buf + 0x2000000; 6177c95d889SJordan Niethe translate_branch(&instr, q, p); 6187c95d889SJordan Niethe patch_instruction(q, instr); 619ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(p, addr)); 620ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(q, addr)); 621f8faaffaSJordan Niethe check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x4a000000))); 622ae0dc736SMichael Ellerman 623ae0dc736SMichael Ellerman /* Maximum positive case, move x to x - 32 MB + 4 */ 624ae0dc736SMichael Ellerman p = buf + 0x2000000; 625ae0dc736SMichael Ellerman addr = (unsigned long)p; 626ae0dc736SMichael Ellerman patch_branch(p, addr, 0); 627ae0dc736SMichael Ellerman q = buf + 4; 6287c95d889SJordan Niethe translate_branch(&instr, q, p); 6297c95d889SJordan Niethe patch_instruction(q, instr); 630ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(p, addr)); 631ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(q, addr)); 632f8faaffaSJordan Niethe check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x49fffffc))); 633ae0dc736SMichael Ellerman 634ae0dc736SMichael Ellerman /* Jump to x + 16 MB moved to x + 20 MB */ 635ae0dc736SMichael Ellerman p = buf; 636ae0dc736SMichael Ellerman addr = 0x1000000 + (unsigned long)buf; 637ae0dc736SMichael Ellerman patch_branch(p, addr, BRANCH_SET_LINK); 638ae0dc736SMichael Ellerman q = buf + 0x1400000; 6397c95d889SJordan Niethe translate_branch(&instr, q, p); 6407c95d889SJordan Niethe patch_instruction(q, instr); 641ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(p, addr)); 642ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(q, addr)); 643ae0dc736SMichael Ellerman 644ae0dc736SMichael Ellerman /* Jump to x + 16 MB moved to x - 16 MB + 4 */ 645ae0dc736SMichael Ellerman p = buf + 0x1000000; 646ae0dc736SMichael Ellerman addr = 0x2000000 + (unsigned long)buf; 647ae0dc736SMichael Ellerman patch_branch(p, addr, 0); 648ae0dc736SMichael Ellerman q = buf + 4; 6497c95d889SJordan Niethe translate_branch(&instr, q, p); 6507c95d889SJordan Niethe patch_instruction(q, instr); 651ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(p, addr)); 652ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(q, addr)); 653ae0dc736SMichael Ellerman 654ae0dc736SMichael Ellerman 655ae0dc736SMichael Ellerman /* Conditional branch tests */ 656ae0dc736SMichael Ellerman 657ae0dc736SMichael Ellerman /* Simple case, branch to self moved a little */ 658ae0dc736SMichael Ellerman p = buf; 659ae0dc736SMichael Ellerman addr = (unsigned long)p; 6607c95d889SJordan Niethe create_cond_branch(&instr, p, addr, 0); 6617c95d889SJordan Niethe patch_instruction(p, instr); 662ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(p, addr)); 6630b582db5SJordan Niethe q = buf + 4; 6647c95d889SJordan Niethe translate_branch(&instr, q, p); 6657c95d889SJordan Niethe patch_instruction(q, instr); 666ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(q, addr)); 667ae0dc736SMichael Ellerman 668ae0dc736SMichael Ellerman /* Maximum negative case, move b . to addr + 32 KB */ 669ae0dc736SMichael Ellerman p = buf; 670ae0dc736SMichael Ellerman addr = (unsigned long)p; 6717c95d889SJordan Niethe create_cond_branch(&instr, p, addr, 0xFFFFFFFC); 6727c95d889SJordan Niethe patch_instruction(p, instr); 673ae0dc736SMichael Ellerman q = buf + 0x8000; 6747c95d889SJordan Niethe translate_branch(&instr, q, p); 6757c95d889SJordan Niethe patch_instruction(q, instr); 676ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(p, addr)); 677ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(q, addr)); 678f8faaffaSJordan Niethe check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x43ff8000))); 679ae0dc736SMichael Ellerman 680ae0dc736SMichael Ellerman /* Maximum positive case, move x to x - 32 KB + 4 */ 681ae0dc736SMichael Ellerman p = buf + 0x8000; 682ae0dc736SMichael Ellerman addr = (unsigned long)p; 6837c95d889SJordan Niethe create_cond_branch(&instr, p, addr, 0xFFFFFFFC); 6847c95d889SJordan Niethe patch_instruction(p, instr); 685ae0dc736SMichael Ellerman q = buf + 4; 6867c95d889SJordan Niethe translate_branch(&instr, q, p); 6877c95d889SJordan Niethe patch_instruction(q, instr); 688ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(p, addr)); 689ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(q, addr)); 690f8faaffaSJordan Niethe check(ppc_inst_equal(ppc_inst_read(q), ppc_inst(0x43ff7ffc))); 691ae0dc736SMichael Ellerman 692ae0dc736SMichael Ellerman /* Jump to x + 12 KB moved to x + 20 KB */ 693ae0dc736SMichael Ellerman p = buf; 694ae0dc736SMichael Ellerman addr = 0x3000 + (unsigned long)buf; 6957c95d889SJordan Niethe create_cond_branch(&instr, p, addr, BRANCH_SET_LINK); 6967c95d889SJordan Niethe patch_instruction(p, instr); 697ae0dc736SMichael Ellerman q = buf + 0x5000; 6987c95d889SJordan Niethe translate_branch(&instr, q, p); 6997c95d889SJordan Niethe patch_instruction(q, instr); 700ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(p, addr)); 701ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(q, addr)); 702ae0dc736SMichael Ellerman 703ae0dc736SMichael Ellerman /* Jump to x + 8 KB moved to x - 8 KB + 4 */ 704ae0dc736SMichael Ellerman p = buf + 0x2000; 705ae0dc736SMichael Ellerman addr = 0x4000 + (unsigned long)buf; 7067c95d889SJordan Niethe create_cond_branch(&instr, p, addr, 0); 7077c95d889SJordan Niethe patch_instruction(p, instr); 708ae0dc736SMichael Ellerman q = buf + 4; 7097c95d889SJordan Niethe translate_branch(&instr, q, p); 7107c95d889SJordan Niethe patch_instruction(q, instr); 711ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(p, addr)); 712ae0dc736SMichael Ellerman check(instr_is_branch_to_addr(q, addr)); 713ae0dc736SMichael Ellerman 714ae0dc736SMichael Ellerman /* Free the buffer we were using */ 715ae0dc736SMichael Ellerman vfree(buf); 716ae0dc736SMichael Ellerman } 717ae0dc736SMichael Ellerman 718f77f8ff7SJordan Niethe #ifdef CONFIG_PPC64 719f77f8ff7SJordan Niethe static void __init test_prefixed_patching(void) 720f77f8ff7SJordan Niethe { 721f77f8ff7SJordan Niethe extern unsigned int code_patching_test1[]; 722f77f8ff7SJordan Niethe extern unsigned int code_patching_test1_expected[]; 723f77f8ff7SJordan Niethe extern unsigned int end_code_patching_test1[]; 724f77f8ff7SJordan Niethe 72569d4d6e5SChristophe Leroy __patch_instruction(code_patching_test1, 726f77f8ff7SJordan Niethe ppc_inst_prefix(OP_PREFIX << 26, 0x00000000), 72769d4d6e5SChristophe Leroy code_patching_test1); 728f77f8ff7SJordan Niethe 729f77f8ff7SJordan Niethe check(!memcmp(code_patching_test1, 730f77f8ff7SJordan Niethe code_patching_test1_expected, 731f77f8ff7SJordan Niethe sizeof(unsigned int) * 732f77f8ff7SJordan Niethe (end_code_patching_test1 - code_patching_test1))); 733f77f8ff7SJordan Niethe } 734f77f8ff7SJordan Niethe #else 735f77f8ff7SJordan Niethe static inline void test_prefixed_patching(void) {} 736f77f8ff7SJordan Niethe #endif 737f77f8ff7SJordan Niethe 738ae0dc736SMichael Ellerman static int __init test_code_patching(void) 739ae0dc736SMichael Ellerman { 740ae0dc736SMichael Ellerman printk(KERN_DEBUG "Running code patching self-tests ...\n"); 741ae0dc736SMichael Ellerman 742ae0dc736SMichael Ellerman test_branch_iform(); 743ae0dc736SMichael Ellerman test_branch_bform(); 744ae0dc736SMichael Ellerman test_create_function_call(); 745ae0dc736SMichael Ellerman test_translate_branch(); 746f77f8ff7SJordan Niethe test_prefixed_patching(); 747ae0dc736SMichael Ellerman 748ae0dc736SMichael Ellerman return 0; 749ae0dc736SMichael Ellerman } 750ae0dc736SMichael Ellerman late_initcall(test_code_patching); 751ae0dc736SMichael Ellerman 752ae0dc736SMichael Ellerman #endif /* CONFIG_CODE_PATCHING_SELFTEST */ 753