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Diffstat (limited to 'ANDROID_3.4.5/arch/powerpc/lib/feature-fixups.c')
-rw-r--r--ANDROID_3.4.5/arch/powerpc/lib/feature-fixups.c376
1 files changed, 0 insertions, 376 deletions
diff --git a/ANDROID_3.4.5/arch/powerpc/lib/feature-fixups.c b/ANDROID_3.4.5/arch/powerpc/lib/feature-fixups.c
deleted file mode 100644
index 7a8a7487..00000000
--- a/ANDROID_3.4.5/arch/powerpc/lib/feature-fixups.c
+++ /dev/null
@@ -1,376 +0,0 @@
-/*
- * 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.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/init.h>
-#include <asm/cputable.h>
-#include <asm/code-patching.h>
-#include <asm/page.h>
-#include <asm/sections.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 unsigned int *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 (unsigned int *)((unsigned long)fcur + offset);
-}
-
-static int patch_alt_instruction(unsigned int *src, unsigned int *dest,
- unsigned int *alt_start, unsigned int *alt_end)
-{
- unsigned int instr;
-
- instr = *src;
-
- if (instr_is_relative_branch(*src)) {
- unsigned int *target = (unsigned int *)branch_target(src);
-
- /* Branch within the section doesn't need translating */
- if (target < alt_start || target >= alt_end) {
- instr = translate_branch(dest, src);
- if (!instr)
- return 1;
- }
- }
-
- patch_instruction(dest, instr);
-
- return 0;
-}
-
-static int patch_feature_section(unsigned long value, struct fixup_entry *fcur)
-{
- unsigned int *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++, dest++) {
- if (patch_alt_instruction(src, dest, alt_start, alt_end))
- return 1;
- }
-
- for (; dest < end; dest++)
- patch_instruction(dest, PPC_INST_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));
- }
- }
-}
-
-void do_lwsync_fixups(unsigned long value, void *fixup_start, void *fixup_end)
-{
- long *start, *end;
- unsigned int *dest;
-
- if (!(value & CPU_FTR_LWSYNC))
- return ;
-
- start = fixup_start;
- end = fixup_end;
-
- for (; start < end; start++) {
- dest = (void *)start + *start;
- patch_instruction(dest, PPC_INST_LWSYNC);
- }
-}
-
-void do_final_fixups(void)
-{
-#if defined(CONFIG_PPC64) && defined(CONFIG_RELOCATABLE)
- int *src, *dest;
- unsigned long length;
-
- if (PHYSICAL_START == 0)
- return;
-
- src = (int *)(KERNELBASE + PHYSICAL_START);
- dest = (int *)KERNELBASE;
- length = (__end_interrupts - _stext) / sizeof(int);
-
- while (length--) {
- patch_instruction(dest, *src);
- src++;
- dest++;
- }
-#endif
-}
-
-#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;
-}
-
-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 = &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 = &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 = &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 = &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 = &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 = &end_ftr_fixup_test6 - &ftr_fixup_test6;
-
- check(memcmp(&ftr_fixup_test6, &ftr_fixup_test6_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);
- }
-}
-
-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_cpu_macros();
- test_fw_macros();
- test_lwsync_macros();
-
- return 0;
-}
-late_initcall(test_feature_fixups);
-
-#endif /* CONFIG_FTR_FIXUP_SELFTEST */
generated by cgit (git 2.34.1) at 2025-01-11 07:10:44 +0000