1019 lines
31 KiB
C
1019 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
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*
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* Modifications for ppc64:
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* Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
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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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ppc_inst_t 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 DEFINE_MUTEX(exit_flush_lock);
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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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// Prevent static key update races with do_rfi_flush_fixups()
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mutex_lock(&exit_flush_lock);
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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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mutex_unlock(&exit_flush_lock);
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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)
|
|
/* 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_E500
|
|
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_E500 */
|
|
|
|
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 */
|