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Diffstat (limited to 'arch/arm/kernel/kprobes-test.c')
| -rw-r--r-- | arch/arm/kernel/kprobes-test.c | 1713 |
1 files changed, 0 insertions, 1713 deletions
diff --git a/arch/arm/kernel/kprobes-test.c b/arch/arm/kernel/kprobes-test.c deleted file mode 100644 index b206d7790c77..000000000000 --- a/arch/arm/kernel/kprobes-test.c +++ /dev/null @@ -1,1713 +0,0 @@ -/* - * arch/arm/kernel/kprobes-test.c - * - * Copyright (C) 2011 Jon Medhurst <tixy@yxit.co.uk>. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - */ - -/* - * This file contains test code for ARM kprobes. - * - * The top level function run_all_tests() executes tests for all of the - * supported instruction sets: ARM, 16-bit Thumb, and 32-bit Thumb. These tests - * fall into two categories; run_api_tests() checks basic functionality of the - * kprobes API, and run_test_cases() is a comprehensive test for kprobes - * instruction decoding and simulation. - * - * run_test_cases() first checks the kprobes decoding table for self consistency - * (using table_test()) then executes a series of test cases for each of the CPU - * instruction forms. coverage_start() and coverage_end() are used to verify - * that these test cases cover all of the possible combinations of instructions - * described by the kprobes decoding tables. - * - * The individual test cases are in kprobes-test-arm.c and kprobes-test-thumb.c - * which use the macros defined in kprobes-test.h. The rest of this - * documentation will describe the operation of the framework used by these - * test cases. - */ - -/* - * TESTING METHODOLOGY - * ------------------- - * - * The methodology used to test an ARM instruction 'test_insn' is to use - * inline assembler like: - * - * test_before: nop - * test_case: test_insn - * test_after: nop - * - * When the test case is run a kprobe is placed of each nop. The - * post-handler of the test_before probe is used to modify the saved CPU - * register context to that which we require for the test case. The - * pre-handler of the of the test_after probe saves a copy of the CPU - * register context. In this way we can execute test_insn with a specific - * register context and see the results afterwards. - * - * To actually test the kprobes instruction emulation we perform the above - * step a second time but with an additional kprobe on the test_case - * instruction itself. If the emulation is accurate then the results seen - * by the test_after probe will be identical to the first run which didn't - * have a probe on test_case. - * - * Each test case is run several times with a variety of variations in the - * flags value of stored in CPSR, and for Thumb code, different ITState. - * - * For instructions which can modify PC, a second test_after probe is used - * like this: - * - * test_before: nop - * test_case: test_insn - * test_after: nop - * b test_done - * test_after2: nop - * test_done: - * - * The test case is constructed such that test_insn branches to - * test_after2, or, if testing a conditional instruction, it may just - * continue to test_after. The probes inserted at both locations let us - * determine which happened. A similar approach is used for testing - * backwards branches... - * - * b test_before - * b test_done @ helps to cope with off by 1 branches - * test_after2: nop - * b test_done - * test_before: nop - * test_case: test_insn - * test_after: nop - * test_done: - * - * The macros used to generate the assembler instructions describe above - * are TEST_INSTRUCTION, TEST_BRANCH_F (branch forwards) and TEST_BRANCH_B - * (branch backwards). In these, the local variables numbered 1, 50, 2 and - * 99 represent: test_before, test_case, test_after2 and test_done. - * - * FRAMEWORK - * --------- - * - * Each test case is wrapped between the pair of macros TESTCASE_START and - * TESTCASE_END. As well as performing the inline assembler boilerplate, - * these call out to the kprobes_test_case_start() and - * kprobes_test_case_end() functions which drive the execution of the test - * case. The specific arguments to use for each test case are stored as - * inline data constructed using the various TEST_ARG_* macros. Putting - * this all together, a simple test case may look like: - * - * TESTCASE_START("Testing mov r0, r7") - * TEST_ARG_REG(7, 0x12345678) // Set r7=0x12345678 - * TEST_ARG_END("") - * TEST_INSTRUCTION("mov r0, r7") - * TESTCASE_END - * - * Note, in practice the single convenience macro TEST_R would be used for this - * instead. - * - * The above would expand to assembler looking something like: - * - * @ TESTCASE_START - * bl __kprobes_test_case_start - * .pushsection .rodata - * "10: - * .ascii "mov r0, r7" @ text title for test case - * .byte 0 - * .popsection - * @ start of inline data... - * .word 10b @ pointer to title in .rodata section - * - * @ TEST_ARG_REG - * .byte ARG_TYPE_REG - * .byte 7 - * .short 0 - * .word 0x1234567 - * - * @ TEST_ARG_END - * .byte ARG_TYPE_END - * .byte TEST_ISA @ flags, including ISA being tested - * .short 50f-0f @ offset of 'test_before' - * .short 2f-0f @ offset of 'test_after2' (if relevent) - * .short 99f-0f @ offset of 'test_done' - * @ start of test case code... - * 0: - * .code TEST_ISA @ switch to ISA being tested - * - * @ TEST_INSTRUCTION - * 50: nop @ location for 'test_before' probe - * 1: mov r0, r7 @ the test case instruction 'test_insn' - * nop @ location for 'test_after' probe - * - * // TESTCASE_END - * 2: - * 99: bl __kprobes_test_case_end_##TEST_ISA - * .code NONMAL_ISA - * - * When the above is execute the following happens... - * - * __kprobes_test_case_start() is an assembler wrapper which sets up space - * for a stack buffer and calls the C function kprobes_test_case_start(). - * This C function will do some initial processing of the inline data and - * setup some global state. It then inserts the test_before and test_after - * kprobes and returns a value which causes the assembler wrapper to jump - * to the start of the test case code, (local label '0'). - * - * When the test case code executes, the test_before probe will be hit and - * test_before_post_handler will call setup_test_context(). This fills the - * stack buffer and CPU registers with a test pattern and then processes - * the test case arguments. In our example there is one TEST_ARG_REG which - * indicates that R7 should be loaded with the value 0x12345678. - * - * When the test_before probe ends, the test case continues and executes - * the "mov r0, r7" instruction. It then hits the test_after probe and the - * pre-handler for this (test_after_pre_handler) will save a copy of the - * CPU register context. This should now have R0 holding the same value as - * R7. - * - * Finally we get to the call to __kprobes_test_case_end_{32,16}. This is - * an assembler wrapper which switches back to the ISA used by the test - * code and calls the C function kprobes_test_case_end(). - * - * For each run through the test case, test_case_run_count is incremented - * by one. For even runs, kprobes_test_case_end() saves a copy of the - * register and stack buffer contents from the test case just run. It then - * inserts a kprobe on the test case instruction 'test_insn' and returns a - * value to cause the test case code to be re-run. - * - * For odd numbered runs, kprobes_test_case_end() compares the register and - * stack buffer contents to those that were saved on the previous even - * numbered run (the one without the kprobe on test_insn). These should be - * the same if the kprobe instruction simulation routine is correct. - * - * The pair of test case runs is repeated with different combinations of - * flag values in CPSR and, for Thumb, different ITState. This is - * controlled by test_context_cpsr(). - * - * BUILDING TEST CASES - * ------------------- - * - * - * As an aid to building test cases, the stack buffer is initialised with - * some special values: - * - * [SP+13*4] Contains SP+120. This can be used to test instructions - * which load a value into SP. - * - * [SP+15*4] When testing branching instructions using TEST_BRANCH_{F,B}, - * this holds the target address of the branch, 'test_after2'. - * This can be used to test instructions which load a PC value - * from memory. - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/kprobes.h> -#include <linux/errno.h> -#include <linux/stddef.h> -#include <linux/bug.h> -#include <asm/opcodes.h> - -#include "kprobes.h" -#include "probes-arm.h" -#include "probes-thumb.h" -#include "kprobes-test.h" - - -#define BENCHMARKING 1 - - -/* - * Test basic API - */ - -static bool test_regs_ok; -static int test_func_instance; -static int pre_handler_called; -static int post_handler_called; -static int jprobe_func_called; -static int kretprobe_handler_called; -static int tests_failed; - -#define FUNC_ARG1 0x12345678 -#define FUNC_ARG2 0xabcdef - - -#ifndef CONFIG_THUMB2_KERNEL - -long arm_func(long r0, long r1); - -static void __used __naked __arm_kprobes_test_func(void) -{ - __asm__ __volatile__ ( - ".arm \n\t" - ".type arm_func, %%function \n\t" - "arm_func: \n\t" - "adds r0, r0, r1 \n\t" - "bx lr \n\t" - ".code "NORMAL_ISA /* Back to Thumb if necessary */ - : : : "r0", "r1", "cc" - ); -} - -#else /* CONFIG_THUMB2_KERNEL */ - -long thumb16_func(long r0, long r1); -long thumb32even_func(long r0, long r1); -long thumb32odd_func(long r0, long r1); - -static void __used __naked __thumb_kprobes_test_funcs(void) -{ - __asm__ __volatile__ ( - ".type thumb16_func, %%function \n\t" - "thumb16_func: \n\t" - "adds.n r0, r0, r1 \n\t" - "bx lr \n\t" - - ".align \n\t" - ".type thumb32even_func, %%function \n\t" - "thumb32even_func: \n\t" - "adds.w r0, r0, r1 \n\t" - "bx lr \n\t" - - ".align \n\t" - "nop.n \n\t" - ".type thumb32odd_func, %%function \n\t" - "thumb32odd_func: \n\t" - "adds.w r0, r0, r1 \n\t" - "bx lr \n\t" - - : : : "r0", "r1", "cc" - ); -} - -#endif /* CONFIG_THUMB2_KERNEL */ - - -static int call_test_func(long (*func)(long, long), bool check_test_regs) -{ - long ret; - - ++test_func_instance; - test_regs_ok = false; - - ret = (*func)(FUNC_ARG1, FUNC_ARG2); - if (ret != FUNC_ARG1 + FUNC_ARG2) { - pr_err("FAIL: call_test_func: func returned %lx\n", ret); - return false; - } - - if (check_test_regs && !test_regs_ok) { - pr_err("FAIL: test regs not OK\n"); - return false; - } - - return true; -} - -static int __kprobes pre_handler(struct kprobe *p, struct pt_regs *regs) -{ - pre_handler_called = test_func_instance; - if (regs->ARM_r0 == FUNC_ARG1 && regs->ARM_r1 == FUNC_ARG2) - test_regs_ok = true; - return 0; -} - -static void __kprobes post_handler(struct kprobe *p, struct pt_regs *regs, - unsigned long flags) -{ - post_handler_called = test_func_instance; - if (regs->ARM_r0 != FUNC_ARG1 + FUNC_ARG2 || regs->ARM_r1 != FUNC_ARG2) - test_regs_ok = false; -} - -static struct kprobe the_kprobe = { - .addr = 0, - .pre_handler = pre_handler, - .post_handler = post_handler -}; - -static int test_kprobe(long (*func)(long, long)) -{ - int ret; - - the_kprobe.addr = (kprobe_opcode_t *)func; - ret = register_kprobe(&the_kprobe); - if (ret < 0) { - pr_err("FAIL: register_kprobe failed with %d\n", ret); - return ret; - } - - ret = call_test_func(func, true); - - unregister_kprobe(&the_kprobe); - the_kprobe.flags = 0; /* Clear disable flag to allow reuse */ - - if (!ret) - return -EINVAL; - if (pre_handler_called != test_func_instance) { - pr_err("FAIL: kprobe pre_handler not called\n"); - return -EINVAL; - } - if (post_handler_called != test_func_instance) { - pr_err("FAIL: kprobe post_handler not called\n"); - return -EINVAL; - } - if (!call_test_func(func, false)) - return -EINVAL; - if (pre_handler_called == test_func_instance || - post_handler_called == test_func_instance) { - pr_err("FAIL: probe called after unregistering\n"); - return -EINVAL; - } - - return 0; -} - -static void __kprobes jprobe_func(long r0, long r1) -{ - jprobe_func_called = test_func_instance; - if (r0 == FUNC_ARG1 && r1 == FUNC_ARG2) - test_regs_ok = true; - jprobe_return(); -} - -static struct jprobe the_jprobe = { - .entry = jprobe_func, -}; - -static int test_jprobe(long (*func)(long, long)) -{ - int ret; - - the_jprobe.kp.addr = (kprobe_opcode_t *)func; - ret = register_jprobe(&the_jprobe); - if (ret < 0) { - pr_err("FAIL: register_jprobe failed with %d\n", ret); - return ret; - } - - ret = call_test_func(func, true); - - unregister_jprobe(&the_jprobe); - the_jprobe.kp.flags = 0; /* Clear disable flag to allow reuse */ - - if (!ret) - return -EINVAL; - if (jprobe_func_called != test_func_instance) { - pr_err("FAIL: jprobe handler function not called\n"); - return -EINVAL; - } - if (!call_test_func(func, false)) - return -EINVAL; - if (jprobe_func_called == test_func_instance) { - pr_err("FAIL: probe called after unregistering\n"); - return -EINVAL; - } - - return 0; -} - -static int __kprobes -kretprobe_handler(struct kretprobe_instance *ri, struct pt_regs *regs) -{ - kretprobe_handler_called = test_func_instance; - if (regs_return_value(regs) == FUNC_ARG1 + FUNC_ARG2) - test_regs_ok = true; - return 0; -} - -static struct kretprobe the_kretprobe = { - .handler = kretprobe_handler, -}; - -static int test_kretprobe(long (*func)(long, long)) -{ - int ret; - - the_kretprobe.kp.addr = (kprobe_opcode_t *)func; - ret = register_kretprobe(&the_kretprobe); - if (ret < 0) { - pr_err("FAIL: register_kretprobe failed with %d\n", ret); - return ret; - } - - ret = call_test_func(func, true); - - unregister_kretprobe(&the_kretprobe); - the_kretprobe.kp.flags = 0; /* Clear disable flag to allow reuse */ - - if (!ret) - return -EINVAL; - if (kretprobe_handler_called != test_func_instance) { - pr_err("FAIL: kretprobe handler not called\n"); - return -EINVAL; - } - if (!call_test_func(func, false)) - return -EINVAL; - if (jprobe_func_called == test_func_instance) { - pr_err("FAIL: kretprobe called after unregistering\n"); - return -EINVAL; - } - - return 0; -} - -static int run_api_tests(long (*func)(long, long)) -{ - int ret; - - pr_info(" kprobe\n"); - ret = test_kprobe(func); - if (ret < 0) - return ret; - - pr_info(" jprobe\n"); - ret = test_jprobe(func); -#if defined(CONFIG_THUMB2_KERNEL) && !defined(MODULE) - if (ret == -EINVAL) { - pr_err("FAIL: Known longtime bug with jprobe on Thumb kernels\n"); - tests_failed = ret; - ret = 0; - } -#endif - if (ret < 0) - return ret; - - pr_info(" kretprobe\n"); - ret = test_kretprobe(func); - if (ret < 0) - return ret; - - return 0; -} - - -/* - * Benchmarking - */ - -#if BENCHMARKING - -static void __naked benchmark_nop(void) -{ - __asm__ __volatile__ ( - "nop \n\t" - "bx lr" - ); -} - -#ifdef CONFIG_THUMB2_KERNEL -#define wide ".w" -#else -#define wide -#endif - -static void __naked benchmark_pushpop1(void) -{ - __asm__ __volatile__ ( - "stmdb"wide" sp!, {r3-r11,lr} \n\t" - "ldmia"wide" sp!, {r3-r11,pc}" - ); -} - -static void __naked benchmark_pushpop2(void) -{ - __asm__ __volatile__ ( - "stmdb"wide" sp!, {r0-r8,lr} \n\t" - "ldmia"wide" sp!, {r0-r8,pc}" - ); -} - -static void __naked benchmark_pushpop3(void) -{ - __asm__ __volatile__ ( - "stmdb"wide" sp!, {r4,lr} \n\t" - "ldmia"wide" sp!, {r4,pc}" - ); -} - -static void __naked benchmark_pushpop4(void) -{ - __asm__ __volatile__ ( - "stmdb"wide" sp!, {r0,lr} \n\t" - "ldmia"wide" sp!, {r0,pc}" - ); -} - - -#ifdef CONFIG_THUMB2_KERNEL - -static void __naked benchmark_pushpop_thumb(void) -{ - __asm__ __volatile__ ( - "push.n {r0-r7,lr} \n\t" - "pop.n {r0-r7,pc}" - ); -} - -#endif - -static int __kprobes -benchmark_pre_handler(struct kprobe *p, struct pt_regs *regs) -{ - return 0; -} - -static int benchmark(void(*fn)(void)) -{ - unsigned n, i, t, t0; - - for (n = 1000; ; n *= 2) { - t0 = sched_clock(); - for (i = n; i > 0; --i) - fn(); - t = sched_clock() - t0; - if (t >= 250000000) - break; /* Stop once we took more than 0.25 seconds */ - } - return t / n; /* Time for one iteration in nanoseconds */ -}; - -static int kprobe_benchmark(void(*fn)(void), unsigned offset) -{ - struct kprobe k = { - .addr = (kprobe_opcode_t *)((uintptr_t)fn + offset), - .pre_handler = benchmark_pre_handler, - }; - - int ret = register_kprobe(&k); - if (ret < 0) { - pr_err("FAIL: register_kprobe failed with %d\n", ret); - return ret; - } - - ret = benchmark(fn); - - unregister_kprobe(&k); - return ret; -}; - -struct benchmarks { - void (*fn)(void); - unsigned offset; - const char *title; -}; - -static int run_benchmarks(void) -{ - int ret; - struct benchmarks list[] = { - {&benchmark_nop, 0, "nop"}, - /* - * benchmark_pushpop{1,3} will have the optimised - * instruction emulation, whilst benchmark_pushpop{2,4} will - * be the equivalent unoptimised instructions. - */ - {&benchmark_pushpop1, 0, "stmdb sp!, {r3-r11,lr}"}, - {&benchmark_pushpop1, 4, "ldmia sp!, {r3-r11,pc}"}, - {&benchmark_pushpop2, 0, "stmdb sp!, {r0-r8,lr}"}, - {&benchmark_pushpop2, 4, "ldmia sp!, {r0-r8,pc}"}, - {&benchmark_pushpop3, 0, "stmdb sp!, {r4,lr}"}, - {&benchmark_pushpop3, 4, "ldmia sp!, {r4,pc}"}, - {&benchmark_pushpop4, 0, "stmdb sp!, {r0,lr}"}, - {&benchmark_pushpop4, 4, "ldmia sp!, {r0,pc}"}, -#ifdef CONFIG_THUMB2_KERNEL - {&benchmark_pushpop_thumb, 0, "push.n {r0-r7,lr}"}, - {&benchmark_pushpop_thumb, 2, "pop.n {r0-r7,pc}"}, -#endif - {0} - }; - - struct benchmarks *b; - for (b = list; b->fn; ++b) { - ret = kprobe_benchmark(b->fn, b->offset); - if (ret < 0) - return ret; - pr_info(" %dns for kprobe %s\n", ret, b->title); - } - - pr_info("\n"); - return 0; -} - -#endif /* BENCHMARKING */ - - -/* - * Decoding table self-consistency tests - */ - -static const int decode_struct_sizes[NUM_DECODE_TYPES] = { - [DECODE_TYPE_TABLE] = sizeof(struct decode_table), - [DECODE_TYPE_CUSTOM] = sizeof(struct decode_custom), - [DECODE_TYPE_SIMULATE] = sizeof(struct decode_simulate), - [DECODE_TYPE_EMULATE] = sizeof(struct decode_emulate), - [DECODE_TYPE_OR] = sizeof(struct decode_or), - [DECODE_TYPE_REJECT] = sizeof(struct decode_reject) -}; - -static int table_iter(const union decode_item *table, - int (*fn)(const struct decode_header *, void *), - void *args) -{ - const struct decode_header *h = (struct decode_header *)table; - int result; - - for (;;) { - enum decode_type type = h->type_regs.bits & DECODE_TYPE_MASK; - - if (type == DECODE_TYPE_END) - return 0; - - result = fn(h, args); - if (result) - return result; - - h = (struct decode_header *) - ((uintptr_t)h + decode_struct_sizes[type]); - - } -} - -static int table_test_fail(const struct decode_header *h, const char* message) -{ - - pr_err("FAIL: kprobes test failure \"%s\" (mask %08x, value %08x)\n", - message, h->mask.bits, h->value.bits); - return -EINVAL; -} - -struct table_test_args { - const union decode_item *root_table; - u32 parent_mask; - u32 parent_value; -}; - -static int table_test_fn(const struct decode_header *h, void *args) -{ - struct table_test_args *a = (struct table_test_args *)args; - enum decode_type type = h->type_regs.bits & DECODE_TYPE_MASK; - - if (h->value.bits & ~h->mask.bits) - return table_test_fail(h, "Match value has bits not in mask"); - - if ((h->mask.bits & a->parent_mask) != a->parent_mask) - return table_test_fail(h, "Mask has bits not in parent mask"); - - if ((h->value.bits ^ a->parent_value) & a->parent_mask) - return table_test_fail(h, "Value is inconsistent with parent"); - - if (type == DECODE_TYPE_TABLE) { - struct decode_table *d = (struct decode_table *)h; - struct table_test_args args2 = *a; - args2.parent_mask = h->mask.bits; - args2.parent_value = h->value.bits; - return table_iter(d->table.table, table_test_fn, &args2); - } - - return 0; -} - -static int table_test(const union decode_item *table) -{ - struct table_test_args args = { - .root_table = table, - .parent_mask = 0, - .parent_value = 0 - }; - return table_iter(args.root_table, table_test_fn, &args); -} - - -/* - * Decoding table test coverage analysis - * - * coverage_start() builds a coverage_table which contains a list of - * coverage_entry's to match each entry in the specified kprobes instruction - * decoding table. - * - * When test cases are run, coverage_add() is called to process each case. - * This looks up the corresponding entry in the coverage_table and sets it as - * being matched, as well as clearing the regs flag appropriate for the test. - * - * After all test cases have been run, coverage_end() is called to check that - * all entries in coverage_table have been matched and that all regs flags are - * cleared. I.e. that all possible combinations of instructions described by - * the kprobes decoding tables have had a test case executed for them. - */ - -bool coverage_fail; - -#define MAX_COVERAGE_ENTRIES 256 - -struct coverage_entry { - const struct decode_header *header; - unsigned regs; - unsigned nesting; - char matched; -}; - -struct coverage_table { - struct coverage_entry *base; - unsigned num_entries; - unsigned nesting; -}; - -struct coverage_table coverage; - -#define COVERAGE_ANY_REG (1<<0) -#define COVERAGE_SP (1<<1) -#define COVERAGE_PC (1<<2) -#define COVERAGE_PCWB (1<<3) - -static const char coverage_register_lookup[16] = { - [REG_TYPE_ANY] = COVERAGE_ANY_REG | COVERAGE_SP | COVERAGE_PC, - [REG_TYPE_SAMEAS16] = COVERAGE_ANY_REG, - [REG_TYPE_SP] = COVERAGE_SP, - [REG_TYPE_PC] = COVERAGE_PC, - [REG_TYPE_NOSP] = COVERAGE_ANY_REG | COVERAGE_SP, - [REG_TYPE_NOSPPC] = COVERAGE_ANY_REG | COVERAGE_SP | COVERAGE_PC, - [REG_TYPE_NOPC] = COVERAGE_ANY_REG | COVERAGE_PC, - [REG_TYPE_NOPCWB] = COVERAGE_ANY_REG | COVERAGE_PC | COVERAGE_PCWB, - [REG_TYPE_NOPCX] = COVERAGE_ANY_REG, - [REG_TYPE_NOSPPCX] = COVERAGE_ANY_REG | COVERAGE_SP, -}; - -unsigned coverage_start_registers(const struct decode_header *h) -{ - unsigned regs = 0; - int i; - for (i = 0; i < 20; i += 4) { - int r = (h->type_regs.bits >> (DECODE_TYPE_BITS + i)) & 0xf; - regs |= coverage_register_lookup[r] << i; - } - return regs; -} - -static int coverage_start_fn(const struct decode_header *h, void *args) -{ - struct coverage_table *coverage = (struct coverage_table *)args; - enum decode_type type = h->type_regs.bits & DECODE_TYPE_MASK; - struct coverage_entry *entry = coverage->base + coverage->num_entries; - - if (coverage->num_entries == MAX_COVERAGE_ENTRIES - 1) { - pr_err("FAIL: Out of space for test coverage data"); - return -ENOMEM; - } - - ++coverage->num_entries; - - entry->header = h; - entry->regs = coverage_start_registers(h); - entry->nesting = coverage->nesting; - entry->matched = false; - - if (type == DECODE_TYPE_TABLE) { - struct decode_table *d = (struct decode_table *)h; - int ret; - ++coverage->nesting; - ret = table_iter(d->table.table, coverage_start_fn, coverage); - --coverage->nesting; - return ret; - } - - return 0; -} - -static int coverage_start(const union decode_item *table) -{ - coverage.base = kmalloc(MAX_COVERAGE_ENTRIES * - sizeof(struct coverage_entry), GFP_KERNEL); - coverage.num_entries = 0; - coverage.nesting = 0; - return table_iter(table, coverage_start_fn, &coverage); -} - -static void -coverage_add_registers(struct coverage_entry *entry, kprobe_opcode_t insn) -{ - int regs = entry->header->type_regs.bits >> DECODE_TYPE_BITS; - int i; - for (i = 0; i < 20; i += 4) { - enum decode_reg_type reg_type = (regs >> i) & 0xf; - int reg = (insn >> i) & 0xf; - int flag; - - if (!reg_type) - continue; - - if (reg == 13) - flag = COVERAGE_SP; - else if (reg == 15) - flag = COVERAGE_PC; - else - flag = COVERAGE_ANY_REG; - entry->regs &= ~(flag << i); - - switch (reg_type) { - - case REG_TYPE_NONE: - case REG_TYPE_ANY: - case REG_TYPE_SAMEAS16: - break; - - case REG_TYPE_SP: - if (reg != 13) - return; - break; - - case REG_TYPE_PC: - if (reg != 15) - return; - break; - - case REG_TYPE_NOSP: - if (reg == 13) - return; - break; - - case REG_TYPE_NOSPPC: - case REG_TYPE_NOSPPCX: - if (reg == 13 || reg == 15) - return; - break; - - case REG_TYPE_NOPCWB: - if (!is_writeback(insn)) - break; - if (reg == 15) { - entry->regs &= ~(COVERAGE_PCWB << i); - return; - } - break; - - case REG_TYPE_NOPC: - case REG_TYPE_NOPCX: - if (reg == 15) - return; - break; - } - - } -} - -static void coverage_add(kprobe_opcode_t insn) -{ - struct coverage_entry *entry = coverage.base; - struct coverage_entry *end = coverage.base + coverage.num_entries; - bool matched = false; - unsigned nesting = 0; - - for (; entry < end; ++entry) { - const struct decode_header *h = entry->header; - enum decode_type type = h->type_regs.bits & DECODE_TYPE_MASK; - - if (entry->nesting > nesting) - continue; /* Skip sub-table we didn't match */ - - if (entry->nesting < nesting) - break; /* End of sub-table we were scanning */ - - if (!matched) { - if ((insn & h->mask.bits) != h->value.bits) - continue; - entry->matched = true; - } - - switch (type) { - - case DECODE_TYPE_TABLE: - ++nesting; - break; - - case DECODE_TYPE_CUSTOM: - case DECODE_TYPE_SIMULATE: - case DECODE_TYPE_EMULATE: - coverage_add_registers(entry, insn); - return; - - case DECODE_TYPE_OR: - matched = true; - break; - - case DECODE_TYPE_REJECT: - default: - return; - } - - } -} - -static void coverage_end(void) -{ - struct coverage_entry *entry = coverage.base; - struct coverage_entry *end = coverage.base + coverage.num_entries; - - for (; entry < end; ++entry) { - u32 mask = entry->header->mask.bits; - u32 value = entry->header->value.bits; - - if (entry->regs) { - pr_err("FAIL: Register test coverage missing for %08x %08x (%05x)\n", - mask, value, entry->regs); - coverage_fail = true; - } - if (!entry->matched) { - pr_err("FAIL: Test coverage entry missing for %08x %08x\n", - mask, value); - coverage_fail = true; - } - } - - kfree(coverage.base); -} - - -/* - * Framework for instruction set test cases - */ - -void __naked __kprobes_test_case_start(void) -{ - __asm__ __volatile__ ( - "stmdb sp!, {r4-r11} \n\t" - "sub sp, sp, #"__stringify(TEST_MEMORY_SIZE)"\n\t" - "bic r0, lr, #1 @ r0 = inline data \n\t" - "mov r1, sp \n\t" - "bl kprobes_test_case_start \n\t" - "bx r0 \n\t" - ); -} - -#ifndef CONFIG_THUMB2_KERNEL - -void __naked __kprobes_test_case_end_32(void) -{ - __asm__ __volatile__ ( - "mov r4, lr \n\t" - "bl kprobes_test_case_end \n\t" - "cmp r0, #0 \n\t" - "movne pc, r0 \n\t" - "mov r0, r4 \n\t" - "add sp, sp, #"__stringify(TEST_MEMORY_SIZE)"\n\t" - "ldmia sp!, {r4-r11} \n\t" - "mov pc, r0 \n\t" - ); -} - -#else /* CONFIG_THUMB2_KERNEL */ - -void __naked __kprobes_test_case_end_16(void) -{ - __asm__ __volatile__ ( - "mov r4, lr \n\t" - "bl kprobes_test_case_end \n\t" - "cmp r0, #0 \n\t" - "bxne r0 \n\t" - "mov r0, r4 \n\t" - "add sp, sp, #"__stringify(TEST_MEMORY_SIZE)"\n\t" - "ldmia sp!, {r4-r11} \n\t" - "bx r0 \n\t" - ); -} - -void __naked __kprobes_test_case_end_32(void) -{ - __asm__ __volatile__ ( - ".arm \n\t" - "orr lr, lr, #1 @ will return to Thumb code \n\t" - "ldr pc, 1f \n\t" - "1: \n\t" - ".word __kprobes_test_case_end_16 \n\t" - ); -} - -#endif - - -int kprobe_test_flags; -int kprobe_test_cc_position; - -static int test_try_count; -static int test_pass_count; -static int test_fail_count; - -static struct pt_regs initial_regs; -static struct pt_regs expected_regs; -static struct pt_regs result_regs; - -static u32 expected_memory[TEST_MEMORY_SIZE/sizeof(u32)]; - -static const char *current_title; -static struct test_arg *current_args; -static u32 *current_stack; -static uintptr_t current_branch_target; - -static uintptr_t current_code_start; -static kprobe_opcode_t current_instruction; - - -#define TEST_CASE_PASSED -1 -#define TEST_CASE_FAILED -2 - -static int test_case_run_count; -static bool test_case_is_thumb; -static int test_instance; - -/* - * We ignore the state of the imprecise abort disable flag (CPSR.A) because this - * can change randomly as the kernel doesn't take care to preserve or initialise - * this across context switches. Also, with Security Extentions, the flag may - * not be under control of the kernel; for this reason we ignore the state of - * the FIQ disable flag CPSR.F as well. - */ -#define PSR_IGNORE_BITS (PSR_A_BIT | PSR_F_BIT) - -static unsigned long test_check_cc(int cc, unsigned long cpsr) -{ - int ret = arm_check_condition(cc << 28, cpsr); - - return (ret != ARM_OPCODE_CONDTEST_FAIL); -} - -static int is_last_scenario; -static int probe_should_run; /* 0 = no, 1 = yes, -1 = unknown */ -static int memory_needs_checking; - -static unsigned long test_context_cpsr(int scenario) -{ - unsigned long cpsr; - - probe_should_run = 1; - - /* Default case is that we cycle through 16 combinations of flags */ - cpsr = (scenario & 0xf) << 28; /* N,Z,C,V flags */ - cpsr |= (scenario & 0xf) << 16; /* GE flags */ - cpsr |= (scenario & 0x1) << 27; /* Toggle Q flag */ - - if (!test_case_is_thumb) { - /* Testing ARM code */ - int cc = current_instruction >> 28; - - probe_should_run = test_check_cc(cc, cpsr) != 0; - if (scenario == 15) - is_last_scenario = true; - - } else if (kprobe_test_flags & TEST_FLAG_NO_ITBLOCK) { - /* Testing Thumb code without setting ITSTATE */ - if (kprobe_test_cc_position) { - int cc = (current_instruction >> kprobe_test_cc_position) & 0xf; - probe_should_run = test_check_cc(cc, cpsr) != 0; - } - - if (scenario == 15) - is_last_scenario = true; - - } else if (kprobe_test_flags & TEST_FLAG_FULL_ITBLOCK) { - /* Testing Thumb code with all combinations of ITSTATE */ - unsigned x = (scenario >> 4); - unsigned cond_base = x % 7; /* ITSTATE<7:5> */ - unsigned mask = x / 7 + 2; /* ITSTATE<4:0>, bits reversed */ - - if (mask > 0x1f) { - /* Finish by testing state from instruction 'itt al' */ - cond_base = 7; - mask = 0x4; - if ((scenario & 0xf) == 0xf) - is_last_scenario = true; - } - - cpsr |= cond_base << 13; /* ITSTATE<7:5> */ - cpsr |= (mask & 0x1) << 12; /* ITSTATE<4> */ - cpsr |= (mask & 0x2) << 10; /* ITSTATE<3> */ - cpsr |= (mask & 0x4) << 8; /* ITSTATE<2> */ - cpsr |= (mask & 0x8) << 23; /* ITSTATE<1> */ - cpsr |= (mask & 0x10) << 21; /* ITSTATE<0> */ - - probe_should_run = test_check_cc((cpsr >> 12) & 0xf, cpsr) != 0; - - } else { - /* Testing Thumb code with several combinations of ITSTATE */ - switch (scenario) { - case 16: /* Clear NZCV flags and 'it eq' state (false as Z=0) */ - cpsr = 0x00000800; - probe_should_run = 0; - break; - case 17: /* Set NZCV flags and 'it vc' state (false as V=1) */ - cpsr = 0xf0007800; - probe_should_run = 0; - break; - case 18: /* Clear NZCV flags and 'it ls' state (true as C=0) */ - cpsr = 0x00009800; - break; - case 19: /* Set NZCV flags and 'it cs' state (true as C=1) */ - cpsr = 0xf0002800; - is_last_scenario = true; - break; - } - } - - return cpsr; -} - -static void setup_test_context(struct pt_regs *regs) -{ - int scenario = test_case_run_count>>1; - unsigned long val; - struct test_arg *args; - int i; - - is_last_scenario = false; - memory_needs_checking = false; - - /* Initialise test memory on stack */ - val = (scenario & 1) ? VALM : ~VALM; - for (i = 0; i < TEST_MEMORY_SIZE / sizeof(current_stack[0]); ++i) - current_stack[i] = val + (i << 8); - /* Put target of branch on stack for tests which load PC from memory */ - if (current_branch_target) - current_stack[15] = current_branch_target; - /* Put a value for SP on stack for tests which load SP from memory */ - current_stack[13] = (u32)current_stack + 120; - - /* Initialise register values to their default state */ - val = (scenario & 2) ? VALR : ~VALR; - for (i = 0; i < 13; ++i) - regs->uregs[i] = val ^ (i << 8); - regs->ARM_lr = val ^ (14 << 8); - regs->ARM_cpsr &= ~(APSR_MASK | PSR_IT_MASK); - regs->ARM_cpsr |= test_context_cpsr(scenario); - - /* Perform testcase specific register setup */ - args = current_args; - for (; args[0].type != ARG_TYPE_END; ++args) - switch (args[0].type) { - case ARG_TYPE_REG: { - struct test_arg_regptr *arg = - (struct test_arg_regptr *)args; - regs->uregs[arg->reg] = arg->val; - break; - } - case ARG_TYPE_PTR: { - struct test_arg_regptr *arg = - (struct test_arg_regptr *)args; - regs->uregs[arg->reg] = - (unsigned long)current_stack + arg->val; - memory_needs_checking = true; - break; - } - case ARG_TYPE_MEM: { - struct test_arg_mem *arg = (struct test_arg_mem *)args; - current_stack[arg->index] = arg->val; - break; - } - default: - break; - } -} - -struct test_probe { - struct kprobe kprobe; - bool registered; - int hit; -}; - -static void unregister_test_probe(struct test_probe *probe) -{ - if (probe->registered) { - unregister_kprobe(&probe->kprobe); - probe->kprobe.flags = 0; /* Clear disable flag to allow reuse */ - } - probe->registered = false; -} - -static int register_test_probe(struct test_probe *probe) -{ - int ret; - - if (probe->registered) - BUG(); - - ret = register_kprobe(&probe->kprobe); - if (ret >= 0) { - probe->registered = true; - probe->hit = -1; - } - return ret; -} - -static int __kprobes -test_before_pre_handler(struct kprobe *p, struct pt_regs *regs) -{ - container_of(p, struct test_probe, kprobe)->hit = test_instance; - return 0; -} - -static void __kprobes -test_before_post_handler(struct kprobe *p, struct pt_regs *regs, - unsigned long flags) -{ - setup_test_context(regs); - initial_regs = *regs; - initial_regs.ARM_cpsr &= ~PSR_IGNORE_BITS; -} - -static int __kprobes -test_case_pre_handler(struct kprobe *p, struct pt_regs *regs) -{ - container_of(p, struct test_probe, kprobe)->hit = test_instance; - return 0; -} - -static int __kprobes -test_after_pre_handler(struct kprobe *p, struct pt_regs *regs) -{ - if (container_of(p, struct test_probe, kprobe)->hit == test_instance) - return 0; /* Already run for this test instance */ - - result_regs = *regs; - result_regs.ARM_cpsr &= ~PSR_IGNORE_BITS; - - /* Undo any changes done to SP by the test case */ - regs->ARM_sp = (unsigned long)current_stack; - - container_of(p, struct test_probe, kprobe)->hit = test_instance; - return 0; -} - -static struct test_probe test_before_probe = { - .kprobe.pre_handler = test_before_pre_handler, - .kprobe.post_handler = test_before_post_handler, -}; - -static struct test_probe test_case_probe = { - .kprobe.pre_handler = test_case_pre_handler, -}; - -static struct test_probe test_after_probe = { - .kprobe.pre_handler = test_after_pre_handler, -}; - -static struct test_probe test_after2_probe = { - .kprobe.pre_handler = test_after_pre_handler, -}; - -static void test_case_cleanup(void) -{ - unregister_test_probe(&test_before_probe); - unregister_test_probe(&test_case_probe); - unregister_test_probe(&test_after_probe); - unregister_test_probe(&test_after2_probe); -} - -static void print_registers(struct pt_regs *regs) -{ - pr_err("r0 %08lx | r1 %08lx | r2 %08lx | r3 %08lx\n", - regs->ARM_r0, regs->ARM_r1, regs->ARM_r2, regs->ARM_r3); - pr_err("r4 %08lx | r5 %08lx | r6 %08lx | r7 %08lx\n", - regs->ARM_r4, regs->ARM_r5, regs->ARM_r6, regs->ARM_r7); - pr_err("r8 %08lx | r9 %08lx | r10 %08lx | r11 %08lx\n", - regs->ARM_r8, regs->ARM_r9, regs->ARM_r10, regs->ARM_fp); - pr_err("r12 %08lx | sp %08lx | lr %08lx | pc %08lx\n", - regs->ARM_ip, regs->ARM_sp, regs->ARM_lr, regs->ARM_pc); - pr_err("cpsr %08lx\n", regs->ARM_cpsr); -} - -static void print_memory(u32 *mem, size_t size) -{ - int i; - for (i = 0; i < size / sizeof(u32); i += 4) - pr_err("%08x %08x %08x %08x\n", mem[i], mem[i+1], - mem[i+2], mem[i+3]); -} - -static size_t expected_memory_size(u32 *sp) -{ - size_t size = sizeof(expected_memory); - int offset = (uintptr_t)sp - (uintptr_t)current_stack; - if (offset > 0) - size -= offset; - return size; -} - -static void test_case_failed(const char *message) -{ - test_case_cleanup(); - - pr_err("FAIL: %s\n", message); - pr_err("FAIL: Test %s\n", current_title); - pr_err("FAIL: Scenario %d\n", test_case_run_count >> 1); -} - -static unsigned long next_instruction(unsigned long pc) -{ -#ifdef CONFIG_THUMB2_KERNEL - if ((pc & 1) && - !is_wide_instruction(__mem_to_opcode_thumb16(*(u16 *)(pc - 1)))) - return pc + 2; - else -#endif - return pc + 4; -} - -static uintptr_t __used kprobes_test_case_start(const char **title, void *stack) -{ - struct test_arg *args; - struct test_arg_end *end_arg; - unsigned long test_code; - - current_title = *title++; - args = (struct test_arg *)title; - current_args = args; - current_stack = stack; - - ++test_try_count; - - while (args->type != ARG_TYPE_END) - ++args; - end_arg = (struct test_arg_end *)args; - - test_code = (unsigned long)(args + 1); /* Code starts after args */ - - test_case_is_thumb = end_arg->flags & ARG_FLAG_THUMB; - if (test_case_is_thumb) - test_code |= 1; - - current_code_start = test_code; - - current_branch_target = 0; - if (end_arg->branch_offset != end_arg->end_offset) - current_branch_target = test_code + end_arg->branch_offset; - - test_code += end_arg->code_offset; - test_before_probe.kprobe.addr = (kprobe_opcode_t *)test_code; - - test_code = next_instruction(test_code); - test_case_probe.kprobe.addr = (kprobe_opcode_t *)test_code; - - if (test_case_is_thumb) { - u16 *p = (u16 *)(test_code & ~1); - current_instruction = __mem_to_opcode_thumb16(p[0]); - if (is_wide_instruction(current_instruction)) { - u16 instr2 = __mem_to_opcode_thumb16(p[1]); - current_instruction = __opcode_thumb32_compose(current_instruction, instr2); - } - } else { - current_instruction = __mem_to_opcode_arm(*(u32 *)test_code); - } - - if (current_title[0] == '.') - verbose("%s\n", current_title); - else - verbose("%s\t@ %0*x\n", current_title, - test_case_is_thumb ? 4 : 8, - current_instruction); - - test_code = next_instruction(test_code); - test_after_probe.kprobe.addr = (kprobe_opcode_t *)test_code; - - if (kprobe_test_flags & TEST_FLAG_NARROW_INSTR) { - if (!test_case_is_thumb || - is_wide_instruction(current_instruction)) { - test_case_failed("expected 16-bit instruction"); - goto fail; - } - } else { - if (test_case_is_thumb && - !is_wide_instruction(current_instruction)) { - test_case_failed("expected 32-bit instruction"); - goto fail; - } - } - - coverage_add(current_instruction); - - if (end_arg->flags & ARG_FLAG_UNSUPPORTED) { - if (register_test_probe(&test_case_probe) < 0) - goto pass; - test_case_failed("registered probe for unsupported instruction"); - goto fail; - } - - if (end_arg->flags & ARG_FLAG_SUPPORTED) { - if (register_test_probe(&test_case_probe) >= 0) - goto pass; - test_case_failed("couldn't register probe for supported instruction"); - goto fail; - } - - if (register_test_probe(&test_before_probe) < 0) { - test_case_failed("register test_before_probe failed"); - goto fail; - } - if (register_test_probe(&test_after_probe) < 0) { - test_case_failed("register test_after_probe failed"); - goto fail; - } - if (current_branch_target) { - test_after2_probe.kprobe.addr = - (kprobe_opcode_t *)current_branch_target; - if (register_test_probe(&test_after2_probe) < 0) { - test_case_failed("register test_after2_probe failed"); - goto fail; - } - } - - /* Start first run of test case */ - test_case_run_count = 0; - ++test_instance; - return current_code_start; -pass: - test_case_run_count = TEST_CASE_PASSED; - return (uintptr_t)test_after_probe.kprobe.addr; -fail: - test_case_run_count = TEST_CASE_FAILED; - return (uintptr_t)test_after_probe.kprobe.addr; -} - -static bool check_test_results(void) -{ - size_t mem_size = 0; - u32 *mem = 0; - - if (memcmp(&expected_regs, &result_regs, sizeof(expected_regs))) { - test_case_failed("registers differ"); - goto fail; - } - - if (memory_needs_checking) { - mem = (u32 *)result_regs.ARM_sp; - mem_size = expected_memory_size(mem); - if (memcmp(expected_memory, mem, mem_size)) { - test_case_failed("test memory differs"); - goto fail; - } - } - - return true; - -fail: - pr_err("initial_regs:\n"); - print_registers(&initial_regs); - pr_err("expected_regs:\n"); - print_registers(&expected_regs); - pr_err("result_regs:\n"); - print_registers(&result_regs); - - if (mem) { - pr_err("current_stack=%p\n", current_stack); - pr_err("expected_memory:\n"); - print_memory(expected_memory, mem_size); - pr_err("result_memory:\n"); - print_memory(mem, mem_size); - } - - return false; -} - -static uintptr_t __used kprobes_test_case_end(void) -{ - if (test_case_run_count < 0) { - if (test_case_run_count == TEST_CASE_PASSED) - /* kprobes_test_case_start did all the needed testing */ - goto pass; - else - /* kprobes_test_case_start failed */ - goto fail; - } - - if (test_before_probe.hit != test_instance) { - test_case_failed("test_before_handler not run"); - goto fail; - } - - if (test_after_probe.hit != test_instance && - test_after2_probe.hit != test_instance) { - test_case_failed("test_after_handler not run"); - goto fail; - } - - /* - * Even numbered test runs ran without a probe on the test case so - * we can gather reference results. The subsequent odd numbered run - * will have the probe inserted. - */ - if ((test_case_run_count & 1) == 0) { - /* Save results from run without probe */ - u32 *mem = (u32 *)result_regs.ARM_sp; - expected_regs = result_regs; - memcpy(expected_memory, mem, expected_memory_size(mem)); - - /* Insert probe onto test case instruction */ - if (register_test_probe(&test_case_probe) < 0) { - test_case_failed("register test_case_probe failed"); - goto fail; - } - } else { - /* Check probe ran as expected */ - if (probe_should_run == 1) { - if (test_case_probe.hit != test_instance) { - test_case_failed("test_case_handler not run"); - goto fail; - } - } else if (probe_should_run == 0) { - if (test_case_probe.hit == test_instance) { - test_case_failed("test_case_handler ran"); - goto fail; - } - } - - /* Remove probe for any subsequent reference run */ - unregister_test_probe(&test_case_probe); - - if (!check_test_results()) - goto fail; - - if (is_last_scenario) - goto pass; - } - - /* Do next test run */ - ++test_case_run_count; - ++test_instance; - return current_code_start; -fail: - ++test_fail_count; - goto end; -pass: - ++test_pass_count; -end: - test_case_cleanup(); - return 0; -} - - -/* - * Top level test functions - */ - -static int run_test_cases(void (*tests)(void), const union decode_item *table) -{ - int ret; - - pr_info(" Check decoding tables\n"); - ret = table_test(table); - if (ret) - return ret; - - pr_info(" Run test cases\n"); - ret = coverage_start(table); - if (ret) - return ret; - - tests(); - - coverage_end(); - return 0; -} - - -static int __init run_all_tests(void) -{ - int ret = 0; - - pr_info("Beginning kprobe tests...\n"); - -#ifndef CONFIG_THUMB2_KERNEL - - pr_info("Probe ARM code\n"); - ret = run_api_tests(arm_func); - if (ret) - goto out; - - pr_info("ARM instruction simulation\n"); - ret = run_test_cases(kprobe_arm_test_cases, probes_decode_arm_table); - if (ret) - goto out; - -#else /* CONFIG_THUMB2_KERNEL */ - - pr_info("Probe 16-bit Thumb code\n"); - ret = run_api_tests(thumb16_func); - if (ret) - goto out; - - pr_info("Probe 32-bit Thumb code, even halfword\n"); - ret = run_api_tests(thumb32even_func); - if (ret) - goto out; - - pr_info("Probe 32-bit Thumb code, odd halfword\n"); - ret = run_api_tests(thumb32odd_func); - if (ret) - goto out; - - pr_info("16-bit Thumb instruction simulation\n"); - ret = run_test_cases(kprobe_thumb16_test_cases, - probes_decode_thumb16_table); - if (ret) - goto out; - - pr_info("32-bit Thumb instruction simulation\n"); - ret = run_test_cases(kprobe_thumb32_test_cases, - probes_decode_thumb32_table); - if (ret) - goto out; -#endif - - pr_info("Total instruction simulation tests=%d, pass=%d fail=%d\n", - test_try_count, test_pass_count, test_fail_count); - if (test_fail_count) { - ret = -EINVAL; - goto out; - } - -#if BENCHMARKING - pr_info("Benchmarks\n"); - ret = run_benchmarks(); - if (ret) - goto out; -#endif - -#if __LINUX_ARM_ARCH__ >= 7 - /* We are able to run all test cases so coverage should be complete */ - if (coverage_fail) { - pr_err("FAIL: Test coverage checks failed\n"); - ret = -EINVAL; - goto out; - } -#endif - -out: - if (ret == 0) - ret = tests_failed; - if (ret == 0) - pr_info("Finished kprobe tests OK\n"); - else - pr_err("kprobe tests failed\n"); - - return ret; -} - - -/* - * Module setup - */ - -#ifdef MODULE - -static void __exit kprobe_test_exit(void) -{ -} - -module_init(run_all_tests) -module_exit(kprobe_test_exit) -MODULE_LICENSE("GPL"); - -#else /* !MODULE */ - -late_initcall(run_all_tests); - -#endif |