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1007 lines
30 KiB
1007 lines
30 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2001 Ben. Herrenschmidt ([email protected]) |
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* |
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* Modifications for ppc64: |
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* Copyright (C) 2003 Dave Engebretsen <[email protected]> |
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* |
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* Copyright 2008 Michael Ellerman, IBM Corporation. |
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*/ |
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#include <linux/types.h> |
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#include <linux/jump_label.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/init.h> |
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#include <linux/sched/mm.h> |
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#include <linux/stop_machine.h> |
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#include <asm/cputable.h> |
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#include <asm/code-patching.h> |
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#include <asm/interrupt.h> |
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#include <asm/page.h> |
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#include <asm/sections.h> |
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#include <asm/setup.h> |
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#include <asm/security_features.h> |
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#include <asm/firmware.h> |
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#include <asm/inst.h> |
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struct fixup_entry { |
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unsigned long mask; |
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unsigned long value; |
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long start_off; |
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long end_off; |
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long alt_start_off; |
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long alt_end_off; |
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}; |
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static u32 *calc_addr(struct fixup_entry *fcur, long offset) |
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{ |
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/* |
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* We store the offset to the code as a negative offset from |
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* the start of the alt_entry, to support the VDSO. This |
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* routine converts that back into an actual address. |
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*/ |
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return (u32 *)((unsigned long)fcur + offset); |
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} |
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static int patch_alt_instruction(u32 *src, u32 *dest, u32 *alt_start, u32 *alt_end) |
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{ |
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int err; |
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struct ppc_inst instr; |
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instr = ppc_inst_read(src); |
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if (instr_is_relative_branch(ppc_inst_read(src))) { |
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u32 *target = (u32 *)branch_target(src); |
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/* Branch within the section doesn't need translating */ |
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if (target < alt_start || target > alt_end) { |
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err = translate_branch(&instr, dest, src); |
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if (err) |
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return 1; |
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} |
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} |
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raw_patch_instruction(dest, instr); |
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return 0; |
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} |
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static int patch_feature_section(unsigned long value, struct fixup_entry *fcur) |
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{ |
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u32 *start, *end, *alt_start, *alt_end, *src, *dest; |
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start = calc_addr(fcur, fcur->start_off); |
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end = calc_addr(fcur, fcur->end_off); |
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alt_start = calc_addr(fcur, fcur->alt_start_off); |
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alt_end = calc_addr(fcur, fcur->alt_end_off); |
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if ((alt_end - alt_start) > (end - start)) |
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return 1; |
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if ((value & fcur->mask) == fcur->value) |
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return 0; |
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src = alt_start; |
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dest = start; |
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for (; src < alt_end; src = ppc_inst_next(src, src), |
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dest = ppc_inst_next(dest, dest)) { |
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if (patch_alt_instruction(src, dest, alt_start, alt_end)) |
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return 1; |
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} |
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for (; dest < end; dest++) |
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raw_patch_instruction(dest, ppc_inst(PPC_RAW_NOP())); |
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return 0; |
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} |
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void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end) |
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{ |
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struct fixup_entry *fcur, *fend; |
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fcur = fixup_start; |
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fend = fixup_end; |
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for (; fcur < fend; fcur++) { |
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if (patch_feature_section(value, fcur)) { |
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WARN_ON(1); |
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printk("Unable to patch feature section at %p - %p" \ |
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" with %p - %p\n", |
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calc_addr(fcur, fcur->start_off), |
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calc_addr(fcur, fcur->end_off), |
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calc_addr(fcur, fcur->alt_start_off), |
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calc_addr(fcur, fcur->alt_end_off)); |
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} |
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} |
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} |
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#ifdef CONFIG_PPC_BOOK3S_64 |
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static void do_stf_entry_barrier_fixups(enum stf_barrier_type types) |
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{ |
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unsigned int instrs[3], *dest; |
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long *start, *end; |
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int i; |
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start = PTRRELOC(&__start___stf_entry_barrier_fixup); |
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end = PTRRELOC(&__stop___stf_entry_barrier_fixup); |
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instrs[0] = PPC_RAW_NOP(); |
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instrs[1] = PPC_RAW_NOP(); |
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instrs[2] = PPC_RAW_NOP(); |
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i = 0; |
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if (types & STF_BARRIER_FALLBACK) { |
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instrs[i++] = PPC_RAW_MFLR(_R10); |
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instrs[i++] = PPC_RAW_NOP(); /* branch patched below */ |
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instrs[i++] = PPC_RAW_MTLR(_R10); |
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} else if (types & STF_BARRIER_EIEIO) { |
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instrs[i++] = PPC_RAW_EIEIO() | 0x02000000; /* eieio + bit 6 hint */ |
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} else if (types & STF_BARRIER_SYNC_ORI) { |
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instrs[i++] = PPC_RAW_SYNC(); |
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instrs[i++] = PPC_RAW_LD(_R10, _R13, 0); |
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instrs[i++] = PPC_RAW_ORI(_R31, _R31, 0); /* speculation barrier */ |
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} |
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for (i = 0; start < end; start++, i++) { |
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dest = (void *)start + *start; |
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pr_devel("patching dest %lx\n", (unsigned long)dest); |
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// See comment in do_entry_flush_fixups() RE order of patching |
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if (types & STF_BARRIER_FALLBACK) { |
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patch_instruction(dest, ppc_inst(instrs[0])); |
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patch_instruction(dest + 2, ppc_inst(instrs[2])); |
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patch_branch(dest + 1, |
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(unsigned long)&stf_barrier_fallback, BRANCH_SET_LINK); |
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} else { |
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patch_instruction(dest + 1, ppc_inst(instrs[1])); |
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patch_instruction(dest + 2, ppc_inst(instrs[2])); |
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patch_instruction(dest, ppc_inst(instrs[0])); |
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} |
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} |
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printk(KERN_DEBUG "stf-barrier: patched %d entry locations (%s barrier)\n", i, |
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(types == STF_BARRIER_NONE) ? "no" : |
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(types == STF_BARRIER_FALLBACK) ? "fallback" : |
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(types == STF_BARRIER_EIEIO) ? "eieio" : |
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(types == (STF_BARRIER_SYNC_ORI)) ? "hwsync" |
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: "unknown"); |
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} |
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static void do_stf_exit_barrier_fixups(enum stf_barrier_type types) |
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{ |
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unsigned int instrs[6], *dest; |
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long *start, *end; |
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int i; |
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start = PTRRELOC(&__start___stf_exit_barrier_fixup); |
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end = PTRRELOC(&__stop___stf_exit_barrier_fixup); |
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instrs[0] = PPC_RAW_NOP(); |
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instrs[1] = PPC_RAW_NOP(); |
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instrs[2] = PPC_RAW_NOP(); |
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instrs[3] = PPC_RAW_NOP(); |
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instrs[4] = PPC_RAW_NOP(); |
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instrs[5] = PPC_RAW_NOP(); |
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i = 0; |
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if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) { |
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if (cpu_has_feature(CPU_FTR_HVMODE)) { |
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instrs[i++] = PPC_RAW_MTSPR(SPRN_HSPRG1, _R13); |
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instrs[i++] = PPC_RAW_MFSPR(_R13, SPRN_HSPRG0); |
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} else { |
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instrs[i++] = PPC_RAW_MTSPR(SPRN_SPRG2, _R13); |
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instrs[i++] = PPC_RAW_MFSPR(_R13, SPRN_SPRG1); |
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} |
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instrs[i++] = PPC_RAW_SYNC(); |
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instrs[i++] = PPC_RAW_LD(_R13, _R13, 0); |
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instrs[i++] = PPC_RAW_ORI(_R31, _R31, 0); /* speculation barrier */ |
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if (cpu_has_feature(CPU_FTR_HVMODE)) |
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instrs[i++] = PPC_RAW_MFSPR(_R13, SPRN_HSPRG1); |
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else |
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instrs[i++] = PPC_RAW_MFSPR(_R13, SPRN_SPRG2); |
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} else if (types & STF_BARRIER_EIEIO) { |
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instrs[i++] = PPC_RAW_EIEIO() | 0x02000000; /* eieio + bit 6 hint */ |
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} |
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for (i = 0; start < end; start++, i++) { |
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dest = (void *)start + *start; |
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pr_devel("patching dest %lx\n", (unsigned long)dest); |
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patch_instruction(dest, ppc_inst(instrs[0])); |
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patch_instruction(dest + 1, ppc_inst(instrs[1])); |
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patch_instruction(dest + 2, ppc_inst(instrs[2])); |
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patch_instruction(dest + 3, ppc_inst(instrs[3])); |
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patch_instruction(dest + 4, ppc_inst(instrs[4])); |
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patch_instruction(dest + 5, ppc_inst(instrs[5])); |
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} |
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printk(KERN_DEBUG "stf-barrier: patched %d exit locations (%s barrier)\n", i, |
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(types == STF_BARRIER_NONE) ? "no" : |
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(types == STF_BARRIER_FALLBACK) ? "fallback" : |
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(types == STF_BARRIER_EIEIO) ? "eieio" : |
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(types == (STF_BARRIER_SYNC_ORI)) ? "hwsync" |
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: "unknown"); |
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} |
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static bool stf_exit_reentrant = false; |
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static bool rfi_exit_reentrant = false; |
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static int __do_stf_barrier_fixups(void *data) |
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{ |
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enum stf_barrier_type *types = data; |
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do_stf_entry_barrier_fixups(*types); |
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do_stf_exit_barrier_fixups(*types); |
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return 0; |
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} |
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void do_stf_barrier_fixups(enum stf_barrier_type types) |
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{ |
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/* |
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* The call to the fallback entry flush, and the fallback/sync-ori exit |
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* flush can not be safely patched in/out while other CPUs are |
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* executing them. So call __do_stf_barrier_fixups() on one CPU while |
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* all other CPUs spin in the stop machine core with interrupts hard |
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* disabled. |
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* |
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* The branch to mark interrupt exits non-reentrant is enabled first, |
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* then stop_machine runs which will ensure all CPUs are out of the |
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* low level interrupt exit code before patching. After the patching, |
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* if allowed, then flip the branch to allow fast exits. |
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*/ |
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static_branch_enable(&interrupt_exit_not_reentrant); |
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stop_machine(__do_stf_barrier_fixups, &types, NULL); |
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if ((types & STF_BARRIER_FALLBACK) || (types & STF_BARRIER_SYNC_ORI)) |
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stf_exit_reentrant = false; |
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else |
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stf_exit_reentrant = true; |
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if (stf_exit_reentrant && rfi_exit_reentrant) |
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static_branch_disable(&interrupt_exit_not_reentrant); |
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} |
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void do_uaccess_flush_fixups(enum l1d_flush_type types) |
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{ |
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unsigned int instrs[4], *dest; |
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long *start, *end; |
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int i; |
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start = PTRRELOC(&__start___uaccess_flush_fixup); |
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end = PTRRELOC(&__stop___uaccess_flush_fixup); |
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instrs[0] = PPC_RAW_NOP(); |
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instrs[1] = PPC_RAW_NOP(); |
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instrs[2] = PPC_RAW_NOP(); |
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instrs[3] = PPC_RAW_BLR(); |
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i = 0; |
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if (types == L1D_FLUSH_FALLBACK) { |
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instrs[3] = PPC_RAW_NOP(); |
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/* fallthrough to fallback flush */ |
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} |
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if (types & L1D_FLUSH_ORI) { |
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instrs[i++] = PPC_RAW_ORI(_R31, _R31, 0); /* speculation barrier */ |
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instrs[i++] = PPC_RAW_ORI(_R30, _R30, 0); /* L1d flush */ |
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} |
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if (types & L1D_FLUSH_MTTRIG) |
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instrs[i++] = PPC_RAW_MTSPR(SPRN_TRIG2, _R0); |
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for (i = 0; start < end; start++, i++) { |
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dest = (void *)start + *start; |
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pr_devel("patching dest %lx\n", (unsigned long)dest); |
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patch_instruction(dest, ppc_inst(instrs[0])); |
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patch_instruction(dest + 1, ppc_inst(instrs[1])); |
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patch_instruction(dest + 2, ppc_inst(instrs[2])); |
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patch_instruction(dest + 3, ppc_inst(instrs[3])); |
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} |
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printk(KERN_DEBUG "uaccess-flush: patched %d locations (%s flush)\n", i, |
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(types == L1D_FLUSH_NONE) ? "no" : |
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(types == L1D_FLUSH_FALLBACK) ? "fallback displacement" : |
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(types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG) |
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? "ori+mttrig type" |
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: "ori type" : |
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(types & L1D_FLUSH_MTTRIG) ? "mttrig type" |
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: "unknown"); |
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} |
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static int __do_entry_flush_fixups(void *data) |
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{ |
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enum l1d_flush_type types = *(enum l1d_flush_type *)data; |
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unsigned int instrs[3], *dest; |
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long *start, *end; |
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int i; |
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instrs[0] = PPC_RAW_NOP(); |
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instrs[1] = PPC_RAW_NOP(); |
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instrs[2] = PPC_RAW_NOP(); |
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i = 0; |
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if (types == L1D_FLUSH_FALLBACK) { |
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instrs[i++] = PPC_RAW_MFLR(_R10); |
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instrs[i++] = PPC_RAW_NOP(); /* branch patched below */ |
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instrs[i++] = PPC_RAW_MTLR(_R10); |
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} |
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if (types & L1D_FLUSH_ORI) { |
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instrs[i++] = PPC_RAW_ORI(_R31, _R31, 0); /* speculation barrier */ |
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instrs[i++] = PPC_RAW_ORI(_R30, _R30, 0); /* L1d flush */ |
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} |
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if (types & L1D_FLUSH_MTTRIG) |
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instrs[i++] = PPC_RAW_MTSPR(SPRN_TRIG2, _R0); |
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/* |
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* If we're patching in or out the fallback flush we need to be careful about the |
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* order in which we patch instructions. That's because it's possible we could |
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* take a page fault after patching one instruction, so the sequence of |
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* instructions must be safe even in a half patched state. |
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* |
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* To make that work, when patching in the fallback flush we patch in this order: |
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* - the mflr (dest) |
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* - the mtlr (dest + 2) |
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* - the branch (dest + 1) |
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* |
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* That ensures the sequence is safe to execute at any point. In contrast if we |
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* patch the mtlr last, it's possible we could return from the branch and not |
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* restore LR, leading to a crash later. |
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* |
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* When patching out the fallback flush (either with nops or another flush type), |
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* we patch in this order: |
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* - the branch (dest + 1) |
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* - the mtlr (dest + 2) |
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* - the mflr (dest) |
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* |
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* Note we are protected by stop_machine() from other CPUs executing the code in a |
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* semi-patched state. |
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*/ |
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start = PTRRELOC(&__start___entry_flush_fixup); |
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end = PTRRELOC(&__stop___entry_flush_fixup); |
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for (i = 0; start < end; start++, i++) { |
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dest = (void *)start + *start; |
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pr_devel("patching dest %lx\n", (unsigned long)dest); |
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if (types == L1D_FLUSH_FALLBACK) { |
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patch_instruction(dest, ppc_inst(instrs[0])); |
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patch_instruction(dest + 2, ppc_inst(instrs[2])); |
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patch_branch(dest + 1, |
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(unsigned long)&entry_flush_fallback, BRANCH_SET_LINK); |
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} else { |
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patch_instruction(dest + 1, ppc_inst(instrs[1])); |
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patch_instruction(dest + 2, ppc_inst(instrs[2])); |
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patch_instruction(dest, ppc_inst(instrs[0])); |
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} |
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} |
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start = PTRRELOC(&__start___scv_entry_flush_fixup); |
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end = PTRRELOC(&__stop___scv_entry_flush_fixup); |
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for (; start < end; start++, i++) { |
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dest = (void *)start + *start; |
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pr_devel("patching dest %lx\n", (unsigned long)dest); |
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if (types == L1D_FLUSH_FALLBACK) { |
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patch_instruction(dest, ppc_inst(instrs[0])); |
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patch_instruction(dest + 2, ppc_inst(instrs[2])); |
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patch_branch(dest + 1, |
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(unsigned long)&scv_entry_flush_fallback, BRANCH_SET_LINK); |
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} else { |
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patch_instruction(dest + 1, ppc_inst(instrs[1])); |
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patch_instruction(dest + 2, ppc_inst(instrs[2])); |
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patch_instruction(dest, ppc_inst(instrs[0])); |
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} |
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} |
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printk(KERN_DEBUG "entry-flush: patched %d locations (%s flush)\n", i, |
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(types == L1D_FLUSH_NONE) ? "no" : |
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(types == L1D_FLUSH_FALLBACK) ? "fallback displacement" : |
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(types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG) |
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? "ori+mttrig type" |
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: "ori type" : |
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(types & L1D_FLUSH_MTTRIG) ? "mttrig type" |
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: "unknown"); |
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return 0; |
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} |
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void do_entry_flush_fixups(enum l1d_flush_type types) |
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{ |
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/* |
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* The call to the fallback flush can not be safely patched in/out while |
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* other CPUs are executing it. So call __do_entry_flush_fixups() on one |
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* CPU while all other CPUs spin in the stop machine core with interrupts |
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* hard disabled. |
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*/ |
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stop_machine(__do_entry_flush_fixups, &types, NULL); |
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} |
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static int __do_rfi_flush_fixups(void *data) |
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{ |
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enum l1d_flush_type types = *(enum l1d_flush_type *)data; |
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unsigned int instrs[3], *dest; |
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long *start, *end; |
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int i; |
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start = PTRRELOC(&__start___rfi_flush_fixup); |
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end = PTRRELOC(&__stop___rfi_flush_fixup); |
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instrs[0] = PPC_RAW_NOP(); |
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instrs[1] = PPC_RAW_NOP(); |
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instrs[2] = PPC_RAW_NOP(); |
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if (types & L1D_FLUSH_FALLBACK) |
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/* b .+16 to fallback flush */ |
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instrs[0] = PPC_INST_BRANCH | 16; |
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i = 0; |
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if (types & L1D_FLUSH_ORI) { |
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instrs[i++] = PPC_RAW_ORI(_R31, _R31, 0); /* speculation barrier */ |
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instrs[i++] = PPC_RAW_ORI(_R30, _R30, 0); /* L1d flush */ |
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} |
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if (types & L1D_FLUSH_MTTRIG) |
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instrs[i++] = PPC_RAW_MTSPR(SPRN_TRIG2, _R0); |
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for (i = 0; start < end; start++, i++) { |
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dest = (void *)start + *start; |
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pr_devel("patching dest %lx\n", (unsigned long)dest); |
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patch_instruction(dest, ppc_inst(instrs[0])); |
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patch_instruction(dest + 1, ppc_inst(instrs[1])); |
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patch_instruction(dest + 2, ppc_inst(instrs[2])); |
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} |
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printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i, |
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(types == L1D_FLUSH_NONE) ? "no" : |
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(types == L1D_FLUSH_FALLBACK) ? "fallback displacement" : |
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(types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG) |
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? "ori+mttrig type" |
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: "ori type" : |
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(types & L1D_FLUSH_MTTRIG) ? "mttrig type" |
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: "unknown"); |
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return 0; |
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} |
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void do_rfi_flush_fixups(enum l1d_flush_type types) |
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{ |
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/* |
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* stop_machine gets all CPUs out of the interrupt exit handler same |
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* as do_stf_barrier_fixups. do_rfi_flush_fixups patching can run |
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* without stop_machine, so this could be achieved with a broadcast |
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* IPI instead, but this matches the stf sequence. |
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*/ |
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static_branch_enable(&interrupt_exit_not_reentrant); |
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stop_machine(__do_rfi_flush_fixups, &types, NULL); |
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if (types & L1D_FLUSH_FALLBACK) |
|
rfi_exit_reentrant = false; |
|
else |
|
rfi_exit_reentrant = true; |
|
|
|
if (stf_exit_reentrant && rfi_exit_reentrant) |
|
static_branch_disable(&interrupt_exit_not_reentrant); |
|
} |
|
|
|
void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end) |
|
{ |
|
unsigned int instr, *dest; |
|
long *start, *end; |
|
int i; |
|
|
|
start = fixup_start; |
|
end = fixup_end; |
|
|
|
instr = PPC_RAW_NOP(); |
|
|
|
if (enable) { |
|
pr_info("barrier-nospec: using ORI speculation barrier\n"); |
|
instr = PPC_RAW_ORI(_R31, _R31, 0); /* speculation barrier */ |
|
} |
|
|
|
for (i = 0; start < end; start++, i++) { |
|
dest = (void *)start + *start; |
|
|
|
pr_devel("patching dest %lx\n", (unsigned long)dest); |
|
patch_instruction(dest, ppc_inst(instr)); |
|
} |
|
|
|
printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i); |
|
} |
|
|
|
#endif /* CONFIG_PPC_BOOK3S_64 */ |
|
|
|
#ifdef CONFIG_PPC_BARRIER_NOSPEC |
|
void do_barrier_nospec_fixups(bool enable) |
|
{ |
|
void *start, *end; |
|
|
|
start = PTRRELOC(&__start___barrier_nospec_fixup); |
|
end = PTRRELOC(&__stop___barrier_nospec_fixup); |
|
|
|
do_barrier_nospec_fixups_range(enable, start, end); |
|
} |
|
#endif /* CONFIG_PPC_BARRIER_NOSPEC */ |
|
|
|
#ifdef CONFIG_PPC_FSL_BOOK3E |
|
void do_barrier_nospec_fixups_range(bool enable, void *fixup_start, void *fixup_end) |
|
{ |
|
unsigned int instr[2], *dest; |
|
long *start, *end; |
|
int i; |
|
|
|
start = fixup_start; |
|
end = fixup_end; |
|
|
|
instr[0] = PPC_RAW_NOP(); |
|
instr[1] = PPC_RAW_NOP(); |
|
|
|
if (enable) { |
|
pr_info("barrier-nospec: using isync; sync as speculation barrier\n"); |
|
instr[0] = PPC_RAW_ISYNC(); |
|
instr[1] = PPC_RAW_SYNC(); |
|
} |
|
|
|
for (i = 0; start < end; start++, i++) { |
|
dest = (void *)start + *start; |
|
|
|
pr_devel("patching dest %lx\n", (unsigned long)dest); |
|
patch_instruction(dest, ppc_inst(instr[0])); |
|
patch_instruction(dest + 1, ppc_inst(instr[1])); |
|
} |
|
|
|
printk(KERN_DEBUG "barrier-nospec: patched %d locations\n", i); |
|
} |
|
|
|
static void patch_btb_flush_section(long *curr) |
|
{ |
|
unsigned int *start, *end; |
|
|
|
start = (void *)curr + *curr; |
|
end = (void *)curr + *(curr + 1); |
|
for (; start < end; start++) { |
|
pr_devel("patching dest %lx\n", (unsigned long)start); |
|
patch_instruction(start, ppc_inst(PPC_RAW_NOP())); |
|
} |
|
} |
|
|
|
void do_btb_flush_fixups(void) |
|
{ |
|
long *start, *end; |
|
|
|
start = PTRRELOC(&__start__btb_flush_fixup); |
|
end = PTRRELOC(&__stop__btb_flush_fixup); |
|
|
|
for (; start < end; start += 2) |
|
patch_btb_flush_section(start); |
|
} |
|
#endif /* CONFIG_PPC_FSL_BOOK3E */ |
|
|
|
void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end) |
|
{ |
|
long *start, *end; |
|
u32 *dest; |
|
|
|
if (!(value & CPU_FTR_LWSYNC)) |
|
return ; |
|
|
|
start = fixup_start; |
|
end = fixup_end; |
|
|
|
for (; start < end; start++) { |
|
dest = (void *)start + *start; |
|
raw_patch_instruction(dest, ppc_inst(PPC_INST_LWSYNC)); |
|
} |
|
} |
|
|
|
static void do_final_fixups(void) |
|
{ |
|
#if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE) |
|
struct ppc_inst inst; |
|
u32 *src, *dest, *end; |
|
|
|
if (PHYSICAL_START == 0) |
|
return; |
|
|
|
src = (u32 *)(KERNELBASE + PHYSICAL_START); |
|
dest = (u32 *)KERNELBASE; |
|
end = (void *)src + (__end_interrupts - _stext); |
|
|
|
while (src < end) { |
|
inst = ppc_inst_read(src); |
|
raw_patch_instruction(dest, inst); |
|
src = ppc_inst_next(src, src); |
|
dest = ppc_inst_next(dest, dest); |
|
} |
|
#endif |
|
} |
|
|
|
static unsigned long __initdata saved_cpu_features; |
|
static unsigned int __initdata saved_mmu_features; |
|
#ifdef CONFIG_PPC64 |
|
static unsigned long __initdata saved_firmware_features; |
|
#endif |
|
|
|
void __init apply_feature_fixups(void) |
|
{ |
|
struct cpu_spec *spec = PTRRELOC(*PTRRELOC(&cur_cpu_spec)); |
|
|
|
*PTRRELOC(&saved_cpu_features) = spec->cpu_features; |
|
*PTRRELOC(&saved_mmu_features) = spec->mmu_features; |
|
|
|
/* |
|
* Apply the CPU-specific and firmware specific fixups to kernel text |
|
* (nop out sections not relevant to this CPU or this firmware). |
|
*/ |
|
do_feature_fixups(spec->cpu_features, |
|
PTRRELOC(&__start___ftr_fixup), |
|
PTRRELOC(&__stop___ftr_fixup)); |
|
|
|
do_feature_fixups(spec->mmu_features, |
|
PTRRELOC(&__start___mmu_ftr_fixup), |
|
PTRRELOC(&__stop___mmu_ftr_fixup)); |
|
|
|
do_lwsync_fixups(spec->cpu_features, |
|
PTRRELOC(&__start___lwsync_fixup), |
|
PTRRELOC(&__stop___lwsync_fixup)); |
|
|
|
#ifdef CONFIG_PPC64 |
|
saved_firmware_features = powerpc_firmware_features; |
|
do_feature_fixups(powerpc_firmware_features, |
|
&__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); |
|
#endif |
|
do_final_fixups(); |
|
} |
|
|
|
void __init setup_feature_keys(void) |
|
{ |
|
/* |
|
* Initialise jump label. This causes all the cpu/mmu_has_feature() |
|
* checks to take on their correct polarity based on the current set of |
|
* CPU/MMU features. |
|
*/ |
|
jump_label_init(); |
|
cpu_feature_keys_init(); |
|
mmu_feature_keys_init(); |
|
} |
|
|
|
static int __init check_features(void) |
|
{ |
|
WARN(saved_cpu_features != cur_cpu_spec->cpu_features, |
|
"CPU features changed after feature patching!\n"); |
|
WARN(saved_mmu_features != cur_cpu_spec->mmu_features, |
|
"MMU features changed after feature patching!\n"); |
|
#ifdef CONFIG_PPC64 |
|
WARN(saved_firmware_features != powerpc_firmware_features, |
|
"Firmware features changed after feature patching!\n"); |
|
#endif |
|
|
|
return 0; |
|
} |
|
late_initcall(check_features); |
|
|
|
#ifdef CONFIG_FTR_FIXUP_SELFTEST |
|
|
|
#define check(x) \ |
|
if (!(x)) printk("feature-fixups: test failed at line %d\n", __LINE__); |
|
|
|
/* This must be after the text it fixes up, vmlinux.lds.S enforces that atm */ |
|
static struct fixup_entry fixup; |
|
|
|
static long calc_offset(struct fixup_entry *entry, unsigned int *p) |
|
{ |
|
return (unsigned long)p - (unsigned long)entry; |
|
} |
|
|
|
static void test_basic_patching(void) |
|
{ |
|
extern unsigned int ftr_fixup_test1[]; |
|
extern unsigned int end_ftr_fixup_test1[]; |
|
extern unsigned int ftr_fixup_test1_orig[]; |
|
extern unsigned int ftr_fixup_test1_expected[]; |
|
int size = 4 * (end_ftr_fixup_test1 - ftr_fixup_test1); |
|
|
|
fixup.value = fixup.mask = 8; |
|
fixup.start_off = calc_offset(&fixup, ftr_fixup_test1 + 1); |
|
fixup.end_off = calc_offset(&fixup, ftr_fixup_test1 + 2); |
|
fixup.alt_start_off = fixup.alt_end_off = 0; |
|
|
|
/* Sanity check */ |
|
check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); |
|
|
|
/* Check we don't patch if the value matches */ |
|
patch_feature_section(8, &fixup); |
|
check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); |
|
|
|
/* Check we do patch if the value doesn't match */ |
|
patch_feature_section(0, &fixup); |
|
check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0); |
|
|
|
/* Check we do patch if the mask doesn't match */ |
|
memcpy(ftr_fixup_test1, ftr_fixup_test1_orig, size); |
|
check(memcmp(ftr_fixup_test1, ftr_fixup_test1_orig, size) == 0); |
|
patch_feature_section(~8, &fixup); |
|
check(memcmp(ftr_fixup_test1, ftr_fixup_test1_expected, size) == 0); |
|
} |
|
|
|
static void test_alternative_patching(void) |
|
{ |
|
extern unsigned int ftr_fixup_test2[]; |
|
extern unsigned int end_ftr_fixup_test2[]; |
|
extern unsigned int ftr_fixup_test2_orig[]; |
|
extern unsigned int ftr_fixup_test2_alt[]; |
|
extern unsigned int ftr_fixup_test2_expected[]; |
|
int size = 4 * (end_ftr_fixup_test2 - ftr_fixup_test2); |
|
|
|
fixup.value = fixup.mask = 0xF; |
|
fixup.start_off = calc_offset(&fixup, ftr_fixup_test2 + 1); |
|
fixup.end_off = calc_offset(&fixup, ftr_fixup_test2 + 2); |
|
fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test2_alt); |
|
fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test2_alt + 1); |
|
|
|
/* Sanity check */ |
|
check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); |
|
|
|
/* Check we don't patch if the value matches */ |
|
patch_feature_section(0xF, &fixup); |
|
check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); |
|
|
|
/* Check we do patch if the value doesn't match */ |
|
patch_feature_section(0, &fixup); |
|
check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0); |
|
|
|
/* Check we do patch if the mask doesn't match */ |
|
memcpy(ftr_fixup_test2, ftr_fixup_test2_orig, size); |
|
check(memcmp(ftr_fixup_test2, ftr_fixup_test2_orig, size) == 0); |
|
patch_feature_section(~0xF, &fixup); |
|
check(memcmp(ftr_fixup_test2, ftr_fixup_test2_expected, size) == 0); |
|
} |
|
|
|
static void test_alternative_case_too_big(void) |
|
{ |
|
extern unsigned int ftr_fixup_test3[]; |
|
extern unsigned int end_ftr_fixup_test3[]; |
|
extern unsigned int ftr_fixup_test3_orig[]; |
|
extern unsigned int ftr_fixup_test3_alt[]; |
|
int size = 4 * (end_ftr_fixup_test3 - ftr_fixup_test3); |
|
|
|
fixup.value = fixup.mask = 0xC; |
|
fixup.start_off = calc_offset(&fixup, ftr_fixup_test3 + 1); |
|
fixup.end_off = calc_offset(&fixup, ftr_fixup_test3 + 2); |
|
fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test3_alt); |
|
fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test3_alt + 2); |
|
|
|
/* Sanity check */ |
|
check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); |
|
|
|
/* Expect nothing to be patched, and the error returned to us */ |
|
check(patch_feature_section(0xF, &fixup) == 1); |
|
check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); |
|
check(patch_feature_section(0, &fixup) == 1); |
|
check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); |
|
check(patch_feature_section(~0xF, &fixup) == 1); |
|
check(memcmp(ftr_fixup_test3, ftr_fixup_test3_orig, size) == 0); |
|
} |
|
|
|
static void test_alternative_case_too_small(void) |
|
{ |
|
extern unsigned int ftr_fixup_test4[]; |
|
extern unsigned int end_ftr_fixup_test4[]; |
|
extern unsigned int ftr_fixup_test4_orig[]; |
|
extern unsigned int ftr_fixup_test4_alt[]; |
|
extern unsigned int ftr_fixup_test4_expected[]; |
|
int size = 4 * (end_ftr_fixup_test4 - ftr_fixup_test4); |
|
unsigned long flag; |
|
|
|
/* Check a high-bit flag */ |
|
flag = 1UL << ((sizeof(unsigned long) - 1) * 8); |
|
fixup.value = fixup.mask = flag; |
|
fixup.start_off = calc_offset(&fixup, ftr_fixup_test4 + 1); |
|
fixup.end_off = calc_offset(&fixup, ftr_fixup_test4 + 5); |
|
fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_test4_alt); |
|
fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_test4_alt + 2); |
|
|
|
/* Sanity check */ |
|
check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); |
|
|
|
/* Check we don't patch if the value matches */ |
|
patch_feature_section(flag, &fixup); |
|
check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); |
|
|
|
/* Check we do patch if the value doesn't match */ |
|
patch_feature_section(0, &fixup); |
|
check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0); |
|
|
|
/* Check we do patch if the mask doesn't match */ |
|
memcpy(ftr_fixup_test4, ftr_fixup_test4_orig, size); |
|
check(memcmp(ftr_fixup_test4, ftr_fixup_test4_orig, size) == 0); |
|
patch_feature_section(~flag, &fixup); |
|
check(memcmp(ftr_fixup_test4, ftr_fixup_test4_expected, size) == 0); |
|
} |
|
|
|
static void test_alternative_case_with_branch(void) |
|
{ |
|
extern unsigned int ftr_fixup_test5[]; |
|
extern unsigned int end_ftr_fixup_test5[]; |
|
extern unsigned int ftr_fixup_test5_expected[]; |
|
int size = 4 * (end_ftr_fixup_test5 - ftr_fixup_test5); |
|
|
|
check(memcmp(ftr_fixup_test5, ftr_fixup_test5_expected, size) == 0); |
|
} |
|
|
|
static void test_alternative_case_with_external_branch(void) |
|
{ |
|
extern unsigned int ftr_fixup_test6[]; |
|
extern unsigned int end_ftr_fixup_test6[]; |
|
extern unsigned int ftr_fixup_test6_expected[]; |
|
int size = 4 * (end_ftr_fixup_test6 - ftr_fixup_test6); |
|
|
|
check(memcmp(ftr_fixup_test6, ftr_fixup_test6_expected, size) == 0); |
|
} |
|
|
|
static void test_alternative_case_with_branch_to_end(void) |
|
{ |
|
extern unsigned int ftr_fixup_test7[]; |
|
extern unsigned int end_ftr_fixup_test7[]; |
|
extern unsigned int ftr_fixup_test7_expected[]; |
|
int size = 4 * (end_ftr_fixup_test7 - ftr_fixup_test7); |
|
|
|
check(memcmp(ftr_fixup_test7, ftr_fixup_test7_expected, size) == 0); |
|
} |
|
|
|
static void test_cpu_macros(void) |
|
{ |
|
extern u8 ftr_fixup_test_FTR_macros[]; |
|
extern u8 ftr_fixup_test_FTR_macros_expected[]; |
|
unsigned long size = ftr_fixup_test_FTR_macros_expected - |
|
ftr_fixup_test_FTR_macros; |
|
|
|
/* The fixups have already been done for us during boot */ |
|
check(memcmp(ftr_fixup_test_FTR_macros, |
|
ftr_fixup_test_FTR_macros_expected, size) == 0); |
|
} |
|
|
|
static void test_fw_macros(void) |
|
{ |
|
#ifdef CONFIG_PPC64 |
|
extern u8 ftr_fixup_test_FW_FTR_macros[]; |
|
extern u8 ftr_fixup_test_FW_FTR_macros_expected[]; |
|
unsigned long size = ftr_fixup_test_FW_FTR_macros_expected - |
|
ftr_fixup_test_FW_FTR_macros; |
|
|
|
/* The fixups have already been done for us during boot */ |
|
check(memcmp(ftr_fixup_test_FW_FTR_macros, |
|
ftr_fixup_test_FW_FTR_macros_expected, size) == 0); |
|
#endif |
|
} |
|
|
|
static void test_lwsync_macros(void) |
|
{ |
|
extern u8 lwsync_fixup_test[]; |
|
extern u8 end_lwsync_fixup_test[]; |
|
extern u8 lwsync_fixup_test_expected_LWSYNC[]; |
|
extern u8 lwsync_fixup_test_expected_SYNC[]; |
|
unsigned long size = end_lwsync_fixup_test - |
|
lwsync_fixup_test; |
|
|
|
/* The fixups have already been done for us during boot */ |
|
if (cur_cpu_spec->cpu_features & CPU_FTR_LWSYNC) { |
|
check(memcmp(lwsync_fixup_test, |
|
lwsync_fixup_test_expected_LWSYNC, size) == 0); |
|
} else { |
|
check(memcmp(lwsync_fixup_test, |
|
lwsync_fixup_test_expected_SYNC, size) == 0); |
|
} |
|
} |
|
|
|
#ifdef CONFIG_PPC64 |
|
static void __init test_prefix_patching(void) |
|
{ |
|
extern unsigned int ftr_fixup_prefix1[]; |
|
extern unsigned int end_ftr_fixup_prefix1[]; |
|
extern unsigned int ftr_fixup_prefix1_orig[]; |
|
extern unsigned int ftr_fixup_prefix1_expected[]; |
|
int size = sizeof(unsigned int) * (end_ftr_fixup_prefix1 - ftr_fixup_prefix1); |
|
|
|
fixup.value = fixup.mask = 8; |
|
fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix1 + 1); |
|
fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix1 + 3); |
|
fixup.alt_start_off = fixup.alt_end_off = 0; |
|
|
|
/* Sanity check */ |
|
check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) == 0); |
|
|
|
patch_feature_section(0, &fixup); |
|
check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_expected, size) == 0); |
|
check(memcmp(ftr_fixup_prefix1, ftr_fixup_prefix1_orig, size) != 0); |
|
} |
|
|
|
static void __init test_prefix_alt_patching(void) |
|
{ |
|
extern unsigned int ftr_fixup_prefix2[]; |
|
extern unsigned int end_ftr_fixup_prefix2[]; |
|
extern unsigned int ftr_fixup_prefix2_orig[]; |
|
extern unsigned int ftr_fixup_prefix2_expected[]; |
|
extern unsigned int ftr_fixup_prefix2_alt[]; |
|
int size = sizeof(unsigned int) * (end_ftr_fixup_prefix2 - ftr_fixup_prefix2); |
|
|
|
fixup.value = fixup.mask = 8; |
|
fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix2 + 1); |
|
fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix2 + 3); |
|
fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_prefix2_alt); |
|
fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix2_alt + 2); |
|
/* Sanity check */ |
|
check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) == 0); |
|
|
|
patch_feature_section(0, &fixup); |
|
check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_expected, size) == 0); |
|
check(memcmp(ftr_fixup_prefix2, ftr_fixup_prefix2_orig, size) != 0); |
|
} |
|
|
|
static void __init test_prefix_word_alt_patching(void) |
|
{ |
|
extern unsigned int ftr_fixup_prefix3[]; |
|
extern unsigned int end_ftr_fixup_prefix3[]; |
|
extern unsigned int ftr_fixup_prefix3_orig[]; |
|
extern unsigned int ftr_fixup_prefix3_expected[]; |
|
extern unsigned int ftr_fixup_prefix3_alt[]; |
|
int size = sizeof(unsigned int) * (end_ftr_fixup_prefix3 - ftr_fixup_prefix3); |
|
|
|
fixup.value = fixup.mask = 8; |
|
fixup.start_off = calc_offset(&fixup, ftr_fixup_prefix3 + 1); |
|
fixup.end_off = calc_offset(&fixup, ftr_fixup_prefix3 + 4); |
|
fixup.alt_start_off = calc_offset(&fixup, ftr_fixup_prefix3_alt); |
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fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix3_alt + 3); |
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/* Sanity check */ |
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check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) == 0); |
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|
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patch_feature_section(0, &fixup); |
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check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_expected, size) == 0); |
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patch_feature_section(0, &fixup); |
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check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) != 0); |
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} |
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#else |
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static inline void test_prefix_patching(void) {} |
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static inline void test_prefix_alt_patching(void) {} |
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static inline void test_prefix_word_alt_patching(void) {} |
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#endif /* CONFIG_PPC64 */ |
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|
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static int __init test_feature_fixups(void) |
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{ |
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printk(KERN_DEBUG "Running feature fixup self-tests ...\n"); |
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|
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test_basic_patching(); |
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test_alternative_patching(); |
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test_alternative_case_too_big(); |
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test_alternative_case_too_small(); |
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test_alternative_case_with_branch(); |
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test_alternative_case_with_external_branch(); |
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test_alternative_case_with_branch_to_end(); |
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test_cpu_macros(); |
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test_fw_macros(); |
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test_lwsync_macros(); |
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test_prefix_patching(); |
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test_prefix_alt_patching(); |
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test_prefix_word_alt_patching(); |
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|
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return 0; |
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} |
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late_initcall(test_feature_fixups); |
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|
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#endif /* CONFIG_FTR_FIXUP_SELFTEST */
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