| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org) |
| * |
| * Modifications for ppc64: |
| * Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com> |
| * |
| * Copyright 2008 Michael Ellerman, IBM Corporation. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/jump_label.h> |
| #include <linux/kernel.h> |
| #include <linux/string.h> |
| #include <linux/init.h> |
| #include <linux/sched/mm.h> |
| #include <linux/stop_machine.h> |
| #include <asm/cputable.h> |
| #include <asm/code-patching.h> |
| #include <asm/interrupt.h> |
| #include <asm/page.h> |
| #include <asm/sections.h> |
| #include <asm/setup.h> |
| #include <asm/security_features.h> |
| #include <asm/firmware.h> |
| #include <asm/inst.h> |
| |
| struct fixup_entry { |
| unsigned long mask; |
| unsigned long value; |
| long start_off; |
| long end_off; |
| long alt_start_off; |
| long alt_end_off; |
| }; |
| |
| static u32 *calc_addr(struct fixup_entry *fcur, long offset) |
| { |
| /* |
| * We store the offset to the code as a negative offset from |
| * the start of the alt_entry, to support the VDSO. This |
| * routine converts that back into an actual address. |
| */ |
| return (u32 *)((unsigned long)fcur + offset); |
| } |
| |
| static int patch_alt_instruction(u32 *src, u32 *dest, u32 *alt_start, u32 *alt_end) |
| { |
| int err; |
| ppc_inst_t instr; |
| |
| instr = ppc_inst_read(src); |
| |
| if (instr_is_relative_branch(ppc_inst_read(src))) { |
| u32 *target = (u32 *)branch_target(src); |
| |
| /* Branch within the section doesn't need translating */ |
| if (target < alt_start || target > alt_end) { |
| err = translate_branch(&instr, dest, src); |
| if (err) |
| return 1; |
| } |
| } |
| |
| raw_patch_instruction(dest, instr); |
| |
| return 0; |
| } |
| |
| static int patch_feature_section(unsigned long value, struct fixup_entry *fcur) |
| { |
| u32 *start, *end, *alt_start, *alt_end, *src, *dest; |
| |
| start = calc_addr(fcur, fcur->start_off); |
| end = calc_addr(fcur, fcur->end_off); |
| alt_start = calc_addr(fcur, fcur->alt_start_off); |
| alt_end = calc_addr(fcur, fcur->alt_end_off); |
| |
| if ((alt_end - alt_start) > (end - start)) |
| return 1; |
| |
| if ((value & fcur->mask) == fcur->value) |
| return 0; |
| |
| src = alt_start; |
| dest = start; |
| |
| for (; src < alt_end; src = ppc_inst_next(src, src), |
| dest = ppc_inst_next(dest, dest)) { |
| if (patch_alt_instruction(src, dest, alt_start, alt_end)) |
| return 1; |
| } |
| |
| for (; dest < end; dest++) |
| raw_patch_instruction(dest, ppc_inst(PPC_RAW_NOP())); |
| |
| return 0; |
| } |
| |
| void do_feature_fixups(unsigned long value, void *fixup_start, void *fixup_end) |
| { |
| struct fixup_entry *fcur, *fend; |
| |
| fcur = fixup_start; |
| fend = fixup_end; |
| |
| for (; fcur < fend; fcur++) { |
| if (patch_feature_section(value, fcur)) { |
| WARN_ON(1); |
| printk("Unable to patch feature section at %p - %p" \ |
| " with %p - %p\n", |
| calc_addr(fcur, fcur->start_off), |
| calc_addr(fcur, fcur->end_off), |
| calc_addr(fcur, fcur->alt_start_off), |
| calc_addr(fcur, fcur->alt_end_off)); |
| } |
| } |
| } |
| |
| #ifdef CONFIG_PPC_BOOK3S_64 |
| static void do_stf_entry_barrier_fixups(enum stf_barrier_type types) |
| { |
| unsigned int instrs[3], *dest; |
| long *start, *end; |
| int i; |
| |
| start = PTRRELOC(&__start___stf_entry_barrier_fixup); |
| end = PTRRELOC(&__stop___stf_entry_barrier_fixup); |
| |
| instrs[0] = PPC_RAW_NOP(); |
| instrs[1] = PPC_RAW_NOP(); |
| instrs[2] = PPC_RAW_NOP(); |
| |
| i = 0; |
| if (types & STF_BARRIER_FALLBACK) { |
| instrs[i++] = PPC_RAW_MFLR(_R10); |
| instrs[i++] = PPC_RAW_NOP(); /* branch patched below */ |
| instrs[i++] = PPC_RAW_MTLR(_R10); |
| } else if (types & STF_BARRIER_EIEIO) { |
| instrs[i++] = PPC_RAW_EIEIO() | 0x02000000; /* eieio + bit 6 hint */ |
| } else if (types & STF_BARRIER_SYNC_ORI) { |
| instrs[i++] = PPC_RAW_SYNC(); |
| instrs[i++] = PPC_RAW_LD(_R10, _R13, 0); |
| instrs[i++] = 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); |
| |
| // See comment in do_entry_flush_fixups() RE order of patching |
| if (types & STF_BARRIER_FALLBACK) { |
| patch_instruction(dest, ppc_inst(instrs[0])); |
| patch_instruction(dest + 2, ppc_inst(instrs[2])); |
| patch_branch(dest + 1, |
| (unsigned long)&stf_barrier_fallback, BRANCH_SET_LINK); |
| } else { |
| patch_instruction(dest + 1, ppc_inst(instrs[1])); |
| patch_instruction(dest + 2, ppc_inst(instrs[2])); |
| patch_instruction(dest, ppc_inst(instrs[0])); |
| } |
| } |
| |
| printk(KERN_DEBUG "stf-barrier: patched %d entry locations (%s barrier)\n", i, |
| (types == STF_BARRIER_NONE) ? "no" : |
| (types == STF_BARRIER_FALLBACK) ? "fallback" : |
| (types == STF_BARRIER_EIEIO) ? "eieio" : |
| (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync" |
| : "unknown"); |
| } |
| |
| static void do_stf_exit_barrier_fixups(enum stf_barrier_type types) |
| { |
| unsigned int instrs[6], *dest; |
| long *start, *end; |
| int i; |
| |
| start = PTRRELOC(&__start___stf_exit_barrier_fixup); |
| end = PTRRELOC(&__stop___stf_exit_barrier_fixup); |
| |
| instrs[0] = PPC_RAW_NOP(); |
| instrs[1] = PPC_RAW_NOP(); |
| instrs[2] = PPC_RAW_NOP(); |
| instrs[3] = PPC_RAW_NOP(); |
| instrs[4] = PPC_RAW_NOP(); |
| instrs[5] = PPC_RAW_NOP(); |
| |
| i = 0; |
| if (types & STF_BARRIER_FALLBACK || types & STF_BARRIER_SYNC_ORI) { |
| if (cpu_has_feature(CPU_FTR_HVMODE)) { |
| instrs[i++] = PPC_RAW_MTSPR(SPRN_HSPRG1, _R13); |
| instrs[i++] = PPC_RAW_MFSPR(_R13, SPRN_HSPRG0); |
| } else { |
| instrs[i++] = PPC_RAW_MTSPR(SPRN_SPRG2, _R13); |
| instrs[i++] = PPC_RAW_MFSPR(_R13, SPRN_SPRG1); |
| } |
| instrs[i++] = PPC_RAW_SYNC(); |
| instrs[i++] = PPC_RAW_LD(_R13, _R13, 0); |
| instrs[i++] = PPC_RAW_ORI(_R31, _R31, 0); /* speculation barrier */ |
| if (cpu_has_feature(CPU_FTR_HVMODE)) |
| instrs[i++] = PPC_RAW_MFSPR(_R13, SPRN_HSPRG1); |
| else |
| instrs[i++] = PPC_RAW_MFSPR(_R13, SPRN_SPRG2); |
| } else if (types & STF_BARRIER_EIEIO) { |
| instrs[i++] = PPC_RAW_EIEIO() | 0x02000000; /* eieio + bit 6 hint */ |
| } |
| |
| 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(instrs[0])); |
| patch_instruction(dest + 1, ppc_inst(instrs[1])); |
| patch_instruction(dest + 2, ppc_inst(instrs[2])); |
| patch_instruction(dest + 3, ppc_inst(instrs[3])); |
| patch_instruction(dest + 4, ppc_inst(instrs[4])); |
| patch_instruction(dest + 5, ppc_inst(instrs[5])); |
| } |
| printk(KERN_DEBUG "stf-barrier: patched %d exit locations (%s barrier)\n", i, |
| (types == STF_BARRIER_NONE) ? "no" : |
| (types == STF_BARRIER_FALLBACK) ? "fallback" : |
| (types == STF_BARRIER_EIEIO) ? "eieio" : |
| (types == (STF_BARRIER_SYNC_ORI)) ? "hwsync" |
| : "unknown"); |
| } |
| |
| static bool stf_exit_reentrant = false; |
| static bool rfi_exit_reentrant = false; |
| static DEFINE_MUTEX(exit_flush_lock); |
| |
| static int __do_stf_barrier_fixups(void *data) |
| { |
| enum stf_barrier_type *types = data; |
| |
| do_stf_entry_barrier_fixups(*types); |
| do_stf_exit_barrier_fixups(*types); |
| |
| return 0; |
| } |
| |
| void do_stf_barrier_fixups(enum stf_barrier_type types) |
| { |
| /* |
| * The call to the fallback entry flush, and the fallback/sync-ori exit |
| * flush can not be safely patched in/out while other CPUs are |
| * executing them. So call __do_stf_barrier_fixups() on one CPU while |
| * all other CPUs spin in the stop machine core with interrupts hard |
| * disabled. |
| * |
| * The branch to mark interrupt exits non-reentrant is enabled first, |
| * then stop_machine runs which will ensure all CPUs are out of the |
| * low level interrupt exit code before patching. After the patching, |
| * if allowed, then flip the branch to allow fast exits. |
| */ |
| |
| // Prevent static key update races with do_rfi_flush_fixups() |
| mutex_lock(&exit_flush_lock); |
| static_branch_enable(&interrupt_exit_not_reentrant); |
| |
| stop_machine(__do_stf_barrier_fixups, &types, NULL); |
| |
| if ((types & STF_BARRIER_FALLBACK) || (types & STF_BARRIER_SYNC_ORI)) |
| stf_exit_reentrant = false; |
| else |
| stf_exit_reentrant = true; |
| |
| if (stf_exit_reentrant && rfi_exit_reentrant) |
| static_branch_disable(&interrupt_exit_not_reentrant); |
| |
| mutex_unlock(&exit_flush_lock); |
| } |
| |
| void do_uaccess_flush_fixups(enum l1d_flush_type types) |
| { |
| unsigned int instrs[4], *dest; |
| long *start, *end; |
| int i; |
| |
| start = PTRRELOC(&__start___uaccess_flush_fixup); |
| end = PTRRELOC(&__stop___uaccess_flush_fixup); |
| |
| instrs[0] = PPC_RAW_NOP(); |
| instrs[1] = PPC_RAW_NOP(); |
| instrs[2] = PPC_RAW_NOP(); |
| instrs[3] = PPC_RAW_BLR(); |
| |
| i = 0; |
| if (types == L1D_FLUSH_FALLBACK) { |
| instrs[3] = PPC_RAW_NOP(); |
| /* fallthrough to fallback flush */ |
| } |
| |
| if (types & L1D_FLUSH_ORI) { |
| instrs[i++] = PPC_RAW_ORI(_R31, _R31, 0); /* speculation barrier */ |
| instrs[i++] = PPC_RAW_ORI(_R30, _R30, 0); /* L1d flush */ |
| } |
| |
| if (types & L1D_FLUSH_MTTRIG) |
| instrs[i++] = PPC_RAW_MTSPR(SPRN_TRIG2, _R0); |
| |
| 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(instrs[0])); |
| |
| patch_instruction(dest + 1, ppc_inst(instrs[1])); |
| patch_instruction(dest + 2, ppc_inst(instrs[2])); |
| patch_instruction(dest + 3, ppc_inst(instrs[3])); |
| } |
| |
| printk(KERN_DEBUG "uaccess-flush: patched %d locations (%s flush)\n", i, |
| (types == L1D_FLUSH_NONE) ? "no" : |
| (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" : |
| (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG) |
| ? "ori+mttrig type" |
| : "ori type" : |
| (types & L1D_FLUSH_MTTRIG) ? "mttrig type" |
| : "unknown"); |
| } |
| |
| static int __do_entry_flush_fixups(void *data) |
| { |
| enum l1d_flush_type types = *(enum l1d_flush_type *)data; |
| unsigned int instrs[3], *dest; |
| long *start, *end; |
| int i; |
| |
| instrs[0] = PPC_RAW_NOP(); |
| instrs[1] = PPC_RAW_NOP(); |
| instrs[2] = PPC_RAW_NOP(); |
| |
| i = 0; |
| if (types == L1D_FLUSH_FALLBACK) { |
| instrs[i++] = PPC_RAW_MFLR(_R10); |
| instrs[i++] = PPC_RAW_NOP(); /* branch patched below */ |
| instrs[i++] = PPC_RAW_MTLR(_R10); |
| } |
| |
| if (types & L1D_FLUSH_ORI) { |
| instrs[i++] = PPC_RAW_ORI(_R31, _R31, 0); /* speculation barrier */ |
| instrs[i++] = PPC_RAW_ORI(_R30, _R30, 0); /* L1d flush */ |
| } |
| |
| if (types & L1D_FLUSH_MTTRIG) |
| instrs[i++] = PPC_RAW_MTSPR(SPRN_TRIG2, _R0); |
| |
| /* |
| * If we're patching in or out the fallback flush we need to be careful about the |
| * order in which we patch instructions. That's because it's possible we could |
| * take a page fault after patching one instruction, so the sequence of |
| * instructions must be safe even in a half patched state. |
| * |
| * To make that work, when patching in the fallback flush we patch in this order: |
| * - the mflr (dest) |
| * - the mtlr (dest + 2) |
| * - the branch (dest + 1) |
| * |
| * That ensures the sequence is safe to execute at any point. In contrast if we |
| * patch the mtlr last, it's possible we could return from the branch and not |
| * restore LR, leading to a crash later. |
| * |
| * When patching out the fallback flush (either with nops or another flush type), |
| * we patch in this order: |
| * - the branch (dest + 1) |
| * - the mtlr (dest + 2) |
| * - the mflr (dest) |
| * |
| * Note we are protected by stop_machine() from other CPUs executing the code in a |
| * semi-patched state. |
| */ |
| |
| start = PTRRELOC(&__start___entry_flush_fixup); |
| end = PTRRELOC(&__stop___entry_flush_fixup); |
| for (i = 0; start < end; start++, i++) { |
| dest = (void *)start + *start; |
| |
| pr_devel("patching dest %lx\n", (unsigned long)dest); |
| |
| if (types == L1D_FLUSH_FALLBACK) { |
| patch_instruction(dest, ppc_inst(instrs[0])); |
| patch_instruction(dest + 2, ppc_inst(instrs[2])); |
| patch_branch(dest + 1, |
| (unsigned long)&entry_flush_fallback, BRANCH_SET_LINK); |
| } else { |
| patch_instruction(dest + 1, ppc_inst(instrs[1])); |
| patch_instruction(dest + 2, ppc_inst(instrs[2])); |
| patch_instruction(dest, ppc_inst(instrs[0])); |
| } |
| } |
| |
| start = PTRRELOC(&__start___scv_entry_flush_fixup); |
| end = PTRRELOC(&__stop___scv_entry_flush_fixup); |
| for (; start < end; start++, i++) { |
| dest = (void *)start + *start; |
| |
| pr_devel("patching dest %lx\n", (unsigned long)dest); |
| |
| if (types == L1D_FLUSH_FALLBACK) { |
| patch_instruction(dest, ppc_inst(instrs[0])); |
| patch_instruction(dest + 2, ppc_inst(instrs[2])); |
| patch_branch(dest + 1, |
| (unsigned long)&scv_entry_flush_fallback, BRANCH_SET_LINK); |
| } else { |
| patch_instruction(dest + 1, ppc_inst(instrs[1])); |
| patch_instruction(dest + 2, ppc_inst(instrs[2])); |
| patch_instruction(dest, ppc_inst(instrs[0])); |
| } |
| } |
| |
| |
| printk(KERN_DEBUG "entry-flush: patched %d locations (%s flush)\n", i, |
| (types == L1D_FLUSH_NONE) ? "no" : |
| (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" : |
| (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG) |
| ? "ori+mttrig type" |
| : "ori type" : |
| (types & L1D_FLUSH_MTTRIG) ? "mttrig type" |
| : "unknown"); |
| |
| return 0; |
| } |
| |
| void do_entry_flush_fixups(enum l1d_flush_type types) |
| { |
| /* |
| * The call to the fallback flush can not be safely patched in/out while |
| * other CPUs are executing it. So call __do_entry_flush_fixups() on one |
| * CPU while all other CPUs spin in the stop machine core with interrupts |
| * hard disabled. |
| */ |
| stop_machine(__do_entry_flush_fixups, &types, NULL); |
| } |
| |
| static int __do_rfi_flush_fixups(void *data) |
| { |
| enum l1d_flush_type types = *(enum l1d_flush_type *)data; |
| unsigned int instrs[3], *dest; |
| long *start, *end; |
| int i; |
| |
| start = PTRRELOC(&__start___rfi_flush_fixup); |
| end = PTRRELOC(&__stop___rfi_flush_fixup); |
| |
| instrs[0] = PPC_RAW_NOP(); |
| instrs[1] = PPC_RAW_NOP(); |
| instrs[2] = PPC_RAW_NOP(); |
| |
| if (types & L1D_FLUSH_FALLBACK) |
| /* b .+16 to fallback flush */ |
| instrs[0] = PPC_RAW_BRANCH(16); |
| |
| i = 0; |
| if (types & L1D_FLUSH_ORI) { |
| instrs[i++] = PPC_RAW_ORI(_R31, _R31, 0); /* speculation barrier */ |
| instrs[i++] = PPC_RAW_ORI(_R30, _R30, 0); /* L1d flush */ |
| } |
| |
| if (types & L1D_FLUSH_MTTRIG) |
| instrs[i++] = PPC_RAW_MTSPR(SPRN_TRIG2, _R0); |
| |
| 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(instrs[0])); |
| patch_instruction(dest + 1, ppc_inst(instrs[1])); |
| patch_instruction(dest + 2, ppc_inst(instrs[2])); |
| } |
| |
| printk(KERN_DEBUG "rfi-flush: patched %d locations (%s flush)\n", i, |
| (types == L1D_FLUSH_NONE) ? "no" : |
| (types == L1D_FLUSH_FALLBACK) ? "fallback displacement" : |
| (types & L1D_FLUSH_ORI) ? (types & L1D_FLUSH_MTTRIG) |
| ? "ori+mttrig type" |
| : "ori type" : |
| (types & L1D_FLUSH_MTTRIG) ? "mttrig type" |
| : "unknown"); |
| |
| return 0; |
| } |
| |
| void do_rfi_flush_fixups(enum l1d_flush_type types) |
| { |
| /* |
| * stop_machine gets all CPUs out of the interrupt exit handler same |
| * as do_stf_barrier_fixups. do_rfi_flush_fixups patching can run |
| * without stop_machine, so this could be achieved with a broadcast |
| * IPI instead, but this matches the stf sequence. |
| */ |
| |
| // Prevent static key update races with do_stf_barrier_fixups() |
| mutex_lock(&exit_flush_lock); |
| static_branch_enable(&interrupt_exit_not_reentrant); |
| |
| stop_machine(__do_rfi_flush_fixups, &types, NULL); |
| |
| 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); |
| |
| mutex_unlock(&exit_flush_lock); |
| } |
| |
| 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 __init 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 __init 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 __init do_final_fixups(void) |
| { |
| #if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE) |
| ppc_inst_t 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 __init calc_offset(struct fixup_entry *entry, unsigned int *p) |
| { |
| return (unsigned long)p - (unsigned long)entry; |
| } |
| |
| static void __init 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 __init 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 __init 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 __init 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 __init 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 __init 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 __init 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 __init 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 __init 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); |
| fixup.alt_end_off = calc_offset(&fixup, ftr_fixup_prefix3_alt + 3); |
| /* Sanity check */ |
| check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) == 0); |
| |
| patch_feature_section(0, &fixup); |
| check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_expected, size) == 0); |
| patch_feature_section(0, &fixup); |
| check(memcmp(ftr_fixup_prefix3, ftr_fixup_prefix3_orig, size) != 0); |
| } |
| #else |
| static inline void test_prefix_patching(void) {} |
| static inline void test_prefix_alt_patching(void) {} |
| static inline void test_prefix_word_alt_patching(void) {} |
| #endif /* CONFIG_PPC64 */ |
| |
| static int __init test_feature_fixups(void) |
| { |
| printk(KERN_DEBUG "Running feature fixup self-tests ...\n"); |
| |
| test_basic_patching(); |
| test_alternative_patching(); |
| test_alternative_case_too_big(); |
| test_alternative_case_too_small(); |
| test_alternative_case_with_branch(); |
| test_alternative_case_with_external_branch(); |
| test_alternative_case_with_branch_to_end(); |
| test_cpu_macros(); |
| test_fw_macros(); |
| test_lwsync_macros(); |
| test_prefix_patching(); |
| test_prefix_alt_patching(); |
| test_prefix_word_alt_patching(); |
| |
| return 0; |
| } |
| late_initcall(test_feature_fixups); |
| |
| #endif /* CONFIG_FTR_FIXUP_SELFTEST */ |