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740 lines
20 KiB
740 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 2008 Michael Ellerman, IBM Corporation. |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/kprobes.h> |
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#include <linux/vmalloc.h> |
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#include <linux/init.h> |
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#include <linux/mm.h> |
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#include <linux/cpuhotplug.h> |
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#include <linux/slab.h> |
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#include <linux/uaccess.h> |
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#include <asm/tlbflush.h> |
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#include <asm/page.h> |
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#include <asm/code-patching.h> |
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#include <asm/setup.h> |
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#include <asm/inst.h> |
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static int __patch_instruction(struct ppc_inst *exec_addr, struct ppc_inst instr, |
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struct ppc_inst *patch_addr) |
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{ |
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if (!ppc_inst_prefixed(instr)) |
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__put_user_asm_goto(ppc_inst_val(instr), patch_addr, failed, "stw"); |
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else |
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__put_user_asm_goto(ppc_inst_as_u64(instr), patch_addr, failed, "std"); |
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asm ("dcbst 0, %0; sync; icbi 0,%1; sync; isync" :: "r" (patch_addr), |
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"r" (exec_addr)); |
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return 0; |
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failed: |
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return -EFAULT; |
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} |
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int raw_patch_instruction(struct ppc_inst *addr, struct ppc_inst instr) |
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{ |
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return __patch_instruction(addr, instr, addr); |
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} |
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#ifdef CONFIG_STRICT_KERNEL_RWX |
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static DEFINE_PER_CPU(struct vm_struct *, text_poke_area); |
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static int text_area_cpu_up(unsigned int cpu) |
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{ |
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struct vm_struct *area; |
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area = get_vm_area(PAGE_SIZE, VM_ALLOC); |
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if (!area) { |
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WARN_ONCE(1, "Failed to create text area for cpu %d\n", |
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cpu); |
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return -1; |
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} |
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this_cpu_write(text_poke_area, area); |
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return 0; |
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} |
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static int text_area_cpu_down(unsigned int cpu) |
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{ |
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free_vm_area(this_cpu_read(text_poke_area)); |
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return 0; |
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} |
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/* |
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* Run as a late init call. This allows all the boot time patching to be done |
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* simply by patching the code, and then we're called here prior to |
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* mark_rodata_ro(), which happens after all init calls are run. Although |
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* BUG_ON() is rude, in this case it should only happen if ENOMEM, and we judge |
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* it as being preferable to a kernel that will crash later when someone tries |
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* to use patch_instruction(). |
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*/ |
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static int __init setup_text_poke_area(void) |
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{ |
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BUG_ON(!cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, |
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"powerpc/text_poke:online", text_area_cpu_up, |
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text_area_cpu_down)); |
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return 0; |
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} |
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late_initcall(setup_text_poke_area); |
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/* |
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* This can be called for kernel text or a module. |
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*/ |
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static int map_patch_area(void *addr, unsigned long text_poke_addr) |
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{ |
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unsigned long pfn; |
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int err; |
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if (is_vmalloc_or_module_addr(addr)) |
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pfn = vmalloc_to_pfn(addr); |
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else |
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pfn = __pa_symbol(addr) >> PAGE_SHIFT; |
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err = map_kernel_page(text_poke_addr, (pfn << PAGE_SHIFT), PAGE_KERNEL); |
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pr_devel("Mapped addr %lx with pfn %lx:%d\n", text_poke_addr, pfn, err); |
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if (err) |
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return -1; |
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return 0; |
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} |
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static inline int unmap_patch_area(unsigned long addr) |
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{ |
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pte_t *ptep; |
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pmd_t *pmdp; |
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pud_t *pudp; |
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p4d_t *p4dp; |
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pgd_t *pgdp; |
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pgdp = pgd_offset_k(addr); |
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if (unlikely(!pgdp)) |
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return -EINVAL; |
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p4dp = p4d_offset(pgdp, addr); |
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if (unlikely(!p4dp)) |
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return -EINVAL; |
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pudp = pud_offset(p4dp, addr); |
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if (unlikely(!pudp)) |
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return -EINVAL; |
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pmdp = pmd_offset(pudp, addr); |
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if (unlikely(!pmdp)) |
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return -EINVAL; |
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ptep = pte_offset_kernel(pmdp, addr); |
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if (unlikely(!ptep)) |
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return -EINVAL; |
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pr_devel("clearing mm %p, pte %p, addr %lx\n", &init_mm, ptep, addr); |
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/* |
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* In hash, pte_clear flushes the tlb, in radix, we have to |
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*/ |
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pte_clear(&init_mm, addr, ptep); |
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flush_tlb_kernel_range(addr, addr + PAGE_SIZE); |
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return 0; |
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} |
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static int do_patch_instruction(struct ppc_inst *addr, struct ppc_inst instr) |
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{ |
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int err; |
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struct ppc_inst *patch_addr = NULL; |
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unsigned long flags; |
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unsigned long text_poke_addr; |
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unsigned long kaddr = (unsigned long)addr; |
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/* |
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* During early early boot patch_instruction is called |
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* when text_poke_area is not ready, but we still need |
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* to allow patching. We just do the plain old patching |
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*/ |
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if (!this_cpu_read(text_poke_area)) |
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return raw_patch_instruction(addr, instr); |
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local_irq_save(flags); |
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text_poke_addr = (unsigned long)__this_cpu_read(text_poke_area)->addr; |
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if (map_patch_area(addr, text_poke_addr)) { |
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err = -1; |
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goto out; |
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} |
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patch_addr = (struct ppc_inst *)(text_poke_addr + (kaddr & ~PAGE_MASK)); |
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__patch_instruction(addr, instr, patch_addr); |
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err = unmap_patch_area(text_poke_addr); |
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if (err) |
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pr_warn("failed to unmap %lx\n", text_poke_addr); |
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out: |
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local_irq_restore(flags); |
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return err; |
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} |
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#else /* !CONFIG_STRICT_KERNEL_RWX */ |
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static int do_patch_instruction(struct ppc_inst *addr, struct ppc_inst instr) |
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{ |
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return raw_patch_instruction(addr, instr); |
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} |
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#endif /* CONFIG_STRICT_KERNEL_RWX */ |
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int patch_instruction(struct ppc_inst *addr, struct ppc_inst instr) |
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{ |
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/* Make sure we aren't patching a freed init section */ |
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if (init_mem_is_free && init_section_contains(addr, 4)) { |
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pr_debug("Skipping init section patching addr: 0x%px\n", addr); |
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return 0; |
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} |
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return do_patch_instruction(addr, instr); |
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} |
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NOKPROBE_SYMBOL(patch_instruction); |
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int patch_branch(struct ppc_inst *addr, unsigned long target, int flags) |
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{ |
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struct ppc_inst instr; |
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create_branch(&instr, addr, target, flags); |
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return patch_instruction(addr, instr); |
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} |
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bool is_offset_in_branch_range(long offset) |
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{ |
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/* |
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* Powerpc branch instruction is : |
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* |
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* 0 6 30 31 |
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* +---------+----------------+---+---+ |
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* | opcode | LI |AA |LK | |
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* +---------+----------------+---+---+ |
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* Where AA = 0 and LK = 0 |
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* |
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* LI is a signed 24 bits integer. The real branch offset is computed |
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* by: imm32 = SignExtend(LI:'0b00', 32); |
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* |
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* So the maximum forward branch should be: |
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* (0x007fffff << 2) = 0x01fffffc = 0x1fffffc |
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* The maximum backward branch should be: |
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* (0xff800000 << 2) = 0xfe000000 = -0x2000000 |
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*/ |
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return (offset >= -0x2000000 && offset <= 0x1fffffc && !(offset & 0x3)); |
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} |
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/* |
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* Helper to check if a given instruction is a conditional branch |
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* Derived from the conditional checks in analyse_instr() |
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*/ |
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bool is_conditional_branch(struct ppc_inst instr) |
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{ |
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unsigned int opcode = ppc_inst_primary_opcode(instr); |
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if (opcode == 16) /* bc, bca, bcl, bcla */ |
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return true; |
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if (opcode == 19) { |
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switch ((ppc_inst_val(instr) >> 1) & 0x3ff) { |
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case 16: /* bclr, bclrl */ |
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case 528: /* bcctr, bcctrl */ |
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case 560: /* bctar, bctarl */ |
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return true; |
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} |
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} |
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return false; |
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} |
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NOKPROBE_SYMBOL(is_conditional_branch); |
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int create_branch(struct ppc_inst *instr, |
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const struct ppc_inst *addr, |
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unsigned long target, int flags) |
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{ |
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long offset; |
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*instr = ppc_inst(0); |
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offset = target; |
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if (! (flags & BRANCH_ABSOLUTE)) |
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offset = offset - (unsigned long)addr; |
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/* Check we can represent the target in the instruction format */ |
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if (!is_offset_in_branch_range(offset)) |
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return 1; |
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/* Mask out the flags and target, so they don't step on each other. */ |
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*instr = ppc_inst(0x48000000 | (flags & 0x3) | (offset & 0x03FFFFFC)); |
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return 0; |
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} |
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int create_cond_branch(struct ppc_inst *instr, const struct ppc_inst *addr, |
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unsigned long target, int flags) |
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{ |
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long offset; |
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offset = target; |
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if (! (flags & BRANCH_ABSOLUTE)) |
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offset = offset - (unsigned long)addr; |
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/* Check we can represent the target in the instruction format */ |
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if (offset < -0x8000 || offset > 0x7FFF || offset & 0x3) |
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return 1; |
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/* Mask out the flags and target, so they don't step on each other. */ |
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*instr = ppc_inst(0x40000000 | (flags & 0x3FF0003) | (offset & 0xFFFC)); |
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return 0; |
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} |
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static unsigned int branch_opcode(struct ppc_inst instr) |
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{ |
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return ppc_inst_primary_opcode(instr) & 0x3F; |
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} |
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static int instr_is_branch_iform(struct ppc_inst instr) |
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{ |
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return branch_opcode(instr) == 18; |
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} |
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static int instr_is_branch_bform(struct ppc_inst instr) |
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{ |
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return branch_opcode(instr) == 16; |
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} |
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int instr_is_relative_branch(struct ppc_inst instr) |
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{ |
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if (ppc_inst_val(instr) & BRANCH_ABSOLUTE) |
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return 0; |
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return instr_is_branch_iform(instr) || instr_is_branch_bform(instr); |
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} |
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int instr_is_relative_link_branch(struct ppc_inst instr) |
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{ |
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return instr_is_relative_branch(instr) && (ppc_inst_val(instr) & BRANCH_SET_LINK); |
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} |
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static unsigned long branch_iform_target(const struct ppc_inst *instr) |
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{ |
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signed long imm; |
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imm = ppc_inst_val(*instr) & 0x3FFFFFC; |
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/* If the top bit of the immediate value is set this is negative */ |
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if (imm & 0x2000000) |
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imm -= 0x4000000; |
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if ((ppc_inst_val(*instr) & BRANCH_ABSOLUTE) == 0) |
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imm += (unsigned long)instr; |
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return (unsigned long)imm; |
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} |
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static unsigned long branch_bform_target(const struct ppc_inst *instr) |
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{ |
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signed long imm; |
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imm = ppc_inst_val(*instr) & 0xFFFC; |
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/* If the top bit of the immediate value is set this is negative */ |
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if (imm & 0x8000) |
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imm -= 0x10000; |
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if ((ppc_inst_val(*instr) & BRANCH_ABSOLUTE) == 0) |
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imm += (unsigned long)instr; |
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return (unsigned long)imm; |
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} |
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unsigned long branch_target(const struct ppc_inst *instr) |
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{ |
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if (instr_is_branch_iform(ppc_inst_read(instr))) |
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return branch_iform_target(instr); |
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else if (instr_is_branch_bform(ppc_inst_read(instr))) |
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return branch_bform_target(instr); |
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return 0; |
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} |
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int instr_is_branch_to_addr(const struct ppc_inst *instr, unsigned long addr) |
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{ |
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if (instr_is_branch_iform(ppc_inst_read(instr)) || |
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instr_is_branch_bform(ppc_inst_read(instr))) |
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return branch_target(instr) == addr; |
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return 0; |
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} |
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int translate_branch(struct ppc_inst *instr, const struct ppc_inst *dest, |
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const struct ppc_inst *src) |
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{ |
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unsigned long target; |
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target = branch_target(src); |
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if (instr_is_branch_iform(ppc_inst_read(src))) |
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return create_branch(instr, dest, target, |
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ppc_inst_val(ppc_inst_read(src))); |
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else if (instr_is_branch_bform(ppc_inst_read(src))) |
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return create_cond_branch(instr, dest, target, |
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ppc_inst_val(ppc_inst_read(src))); |
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return 1; |
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} |
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#ifdef CONFIG_PPC_BOOK3E_64 |
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void __patch_exception(int exc, unsigned long addr) |
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{ |
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extern unsigned int interrupt_base_book3e; |
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unsigned int *ibase = &interrupt_base_book3e; |
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/* Our exceptions vectors start with a NOP and -then- a branch |
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* to deal with single stepping from userspace which stops on |
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* the second instruction. Thus we need to patch the second |
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* instruction of the exception, not the first one |
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*/ |
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patch_branch((struct ppc_inst *)(ibase + (exc / 4) + 1), addr, 0); |
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} |
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#endif |
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#ifdef CONFIG_CODE_PATCHING_SELFTEST |
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static void __init test_trampoline(void) |
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{ |
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asm ("nop;\n"); |
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} |
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#define check(x) \ |
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if (!(x)) printk("code-patching: test failed at line %d\n", __LINE__); |
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static void __init test_branch_iform(void) |
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{ |
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int err; |
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struct ppc_inst instr; |
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unsigned long addr; |
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addr = (unsigned long)&instr; |
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/* The simplest case, branch to self, no flags */ |
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check(instr_is_branch_iform(ppc_inst(0x48000000))); |
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/* All bits of target set, and flags */ |
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check(instr_is_branch_iform(ppc_inst(0x4bffffff))); |
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/* High bit of opcode set, which is wrong */ |
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check(!instr_is_branch_iform(ppc_inst(0xcbffffff))); |
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/* Middle bits of opcode set, which is wrong */ |
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check(!instr_is_branch_iform(ppc_inst(0x7bffffff))); |
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/* Simplest case, branch to self with link */ |
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check(instr_is_branch_iform(ppc_inst(0x48000001))); |
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/* All bits of targets set */ |
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check(instr_is_branch_iform(ppc_inst(0x4bfffffd))); |
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/* Some bits of targets set */ |
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check(instr_is_branch_iform(ppc_inst(0x4bff00fd))); |
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/* Must be a valid branch to start with */ |
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check(!instr_is_branch_iform(ppc_inst(0x7bfffffd))); |
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/* Absolute branch to 0x100 */ |
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instr = ppc_inst(0x48000103); |
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check(instr_is_branch_to_addr(&instr, 0x100)); |
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/* Absolute branch to 0x420fc */ |
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instr = ppc_inst(0x480420ff); |
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check(instr_is_branch_to_addr(&instr, 0x420fc)); |
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/* Maximum positive relative branch, + 20MB - 4B */ |
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instr = ppc_inst(0x49fffffc); |
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check(instr_is_branch_to_addr(&instr, addr + 0x1FFFFFC)); |
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/* Smallest negative relative branch, - 4B */ |
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instr = ppc_inst(0x4bfffffc); |
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check(instr_is_branch_to_addr(&instr, addr - 4)); |
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/* Largest negative relative branch, - 32 MB */ |
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instr = ppc_inst(0x4a000000); |
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check(instr_is_branch_to_addr(&instr, addr - 0x2000000)); |
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/* Branch to self, with link */ |
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err = create_branch(&instr, &instr, addr, BRANCH_SET_LINK); |
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check(instr_is_branch_to_addr(&instr, addr)); |
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/* Branch to self - 0x100, with link */ |
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err = create_branch(&instr, &instr, addr - 0x100, BRANCH_SET_LINK); |
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check(instr_is_branch_to_addr(&instr, addr - 0x100)); |
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/* Branch to self + 0x100, no link */ |
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err = create_branch(&instr, &instr, addr + 0x100, 0); |
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check(instr_is_branch_to_addr(&instr, addr + 0x100)); |
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/* Maximum relative negative offset, - 32 MB */ |
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err = create_branch(&instr, &instr, addr - 0x2000000, BRANCH_SET_LINK); |
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check(instr_is_branch_to_addr(&instr, addr - 0x2000000)); |
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/* Out of range relative negative offset, - 32 MB + 4*/ |
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err = create_branch(&instr, &instr, addr - 0x2000004, BRANCH_SET_LINK); |
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check(err); |
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/* Out of range relative positive offset, + 32 MB */ |
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err = create_branch(&instr, &instr, addr + 0x2000000, BRANCH_SET_LINK); |
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check(err); |
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/* Unaligned target */ |
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err = create_branch(&instr, &instr, addr + 3, BRANCH_SET_LINK); |
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check(err); |
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/* Check flags are masked correctly */ |
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err = create_branch(&instr, &instr, addr, 0xFFFFFFFC); |
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check(instr_is_branch_to_addr(&instr, addr)); |
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check(ppc_inst_equal(instr, ppc_inst(0x48000000))); |
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} |
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static void __init test_create_function_call(void) |
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{ |
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struct ppc_inst *iptr; |
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unsigned long dest; |
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struct ppc_inst instr; |
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/* Check we can create a function call */ |
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iptr = (struct ppc_inst *)ppc_function_entry(test_trampoline); |
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dest = ppc_function_entry(test_create_function_call); |
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create_branch(&instr, iptr, dest, BRANCH_SET_LINK); |
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patch_instruction(iptr, instr); |
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check(instr_is_branch_to_addr(iptr, dest)); |
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} |
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static void __init test_branch_bform(void) |
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{ |
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int err; |
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unsigned long addr; |
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struct ppc_inst *iptr, instr; |
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unsigned int flags; |
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iptr = &instr; |
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addr = (unsigned long)iptr; |
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/* The simplest case, branch to self, no flags */ |
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check(instr_is_branch_bform(ppc_inst(0x40000000))); |
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/* All bits of target set, and flags */ |
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check(instr_is_branch_bform(ppc_inst(0x43ffffff))); |
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/* High bit of opcode set, which is wrong */ |
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check(!instr_is_branch_bform(ppc_inst(0xc3ffffff))); |
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/* Middle bits of opcode set, which is wrong */ |
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check(!instr_is_branch_bform(ppc_inst(0x7bffffff))); |
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/* Absolute conditional branch to 0x100 */ |
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instr = ppc_inst(0x43ff0103); |
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check(instr_is_branch_to_addr(&instr, 0x100)); |
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/* Absolute conditional branch to 0x20fc */ |
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instr = ppc_inst(0x43ff20ff); |
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check(instr_is_branch_to_addr(&instr, 0x20fc)); |
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/* Maximum positive relative conditional branch, + 32 KB - 4B */ |
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instr = ppc_inst(0x43ff7ffc); |
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check(instr_is_branch_to_addr(&instr, addr + 0x7FFC)); |
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/* Smallest negative relative conditional branch, - 4B */ |
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instr = ppc_inst(0x43fffffc); |
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check(instr_is_branch_to_addr(&instr, addr - 4)); |
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/* Largest negative relative conditional branch, - 32 KB */ |
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instr = ppc_inst(0x43ff8000); |
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check(instr_is_branch_to_addr(&instr, addr - 0x8000)); |
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/* All condition code bits set & link */ |
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flags = 0x3ff000 | BRANCH_SET_LINK; |
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/* Branch to self */ |
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err = create_cond_branch(&instr, iptr, addr, flags); |
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check(instr_is_branch_to_addr(&instr, addr)); |
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|
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/* Branch to self - 0x100 */ |
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err = create_cond_branch(&instr, iptr, addr - 0x100, flags); |
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check(instr_is_branch_to_addr(&instr, addr - 0x100)); |
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|
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/* Branch to self + 0x100 */ |
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err = create_cond_branch(&instr, iptr, addr + 0x100, flags); |
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check(instr_is_branch_to_addr(&instr, addr + 0x100)); |
|
|
|
/* Maximum relative negative offset, - 32 KB */ |
|
err = create_cond_branch(&instr, iptr, addr - 0x8000, flags); |
|
check(instr_is_branch_to_addr(&instr, 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); |
|
check(instr_is_branch_to_addr(&instr, 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((struct ppc_inst *)code_patching_test1, |
|
ppc_inst_prefix(OP_PREFIX << 26, 0x00000000), |
|
(struct ppc_inst *)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 */
|
|
|