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ad684dce87
When compiling kprobes-test-arm.c the following error has been observed /tmp/ccoT403o.s:21439: Error: bad immediate value for offset (4168) This is caused by the compiler spilling it's literal pool too far away from the site which is trying to reference it with a PC relative load. This arises because the compiler is underestimating the size of the inline assembler code present, which apparently it approximates as 4 bytes per line or instruction. We fix this problem by moving the operations which generate more than 4 bytes out of the text section. Specifically, moving the .ascii directives to the .rodata section. Signed-off-by: Jon Medhurst <tixy@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
436 lines
12 KiB
C
436 lines
12 KiB
C
/*
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* arch/arm/kernel/kprobes-test.h
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*
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* Copyright (C) 2011 Jon Medhurst <tixy@yxit.co.uk>.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define VERBOSE 0 /* Set to '1' for more logging of test cases */
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#ifdef CONFIG_THUMB2_KERNEL
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#define NORMAL_ISA "16"
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#else
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#define NORMAL_ISA "32"
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#endif
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/* Flags used in kprobe_test_flags */
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#define TEST_FLAG_NO_ITBLOCK (1<<0)
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#define TEST_FLAG_FULL_ITBLOCK (1<<1)
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#define TEST_FLAG_NARROW_INSTR (1<<2)
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extern int kprobe_test_flags;
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extern int kprobe_test_cc_position;
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#define TEST_MEMORY_SIZE 256
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/*
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* Test case structures.
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*
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* The arguments given to test cases can be one of three types.
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*
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* ARG_TYPE_REG
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* Load a register with the given value.
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*
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* ARG_TYPE_PTR
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* Load a register with a pointer into the stack buffer (SP + given value).
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*
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* ARG_TYPE_MEM
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* Store the given value into the stack buffer at [SP+index].
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*
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*/
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#define ARG_TYPE_END 0
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#define ARG_TYPE_REG 1
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#define ARG_TYPE_PTR 2
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#define ARG_TYPE_MEM 3
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#define ARG_FLAG_UNSUPPORTED 0x01
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#define ARG_FLAG_SUPPORTED 0x02
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#define ARG_FLAG_THUMB 0x10 /* Must be 16 so TEST_ISA can be used */
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#define ARG_FLAG_ARM 0x20 /* Must be 32 so TEST_ISA can be used */
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struct test_arg {
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u8 type; /* ARG_TYPE_x */
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u8 _padding[7];
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};
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struct test_arg_regptr {
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u8 type; /* ARG_TYPE_REG or ARG_TYPE_PTR */
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u8 reg;
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u8 _padding[2];
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u32 val;
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};
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struct test_arg_mem {
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u8 type; /* ARG_TYPE_MEM */
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u8 index;
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u8 _padding[2];
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u32 val;
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};
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struct test_arg_end {
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u8 type; /* ARG_TYPE_END */
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u8 flags; /* ARG_FLAG_x */
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u16 code_offset;
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u16 branch_offset;
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u16 end_offset;
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};
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/*
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* Building blocks for test cases.
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*
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* Each test case is wrapped between TESTCASE_START and TESTCASE_END.
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*
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* To specify arguments for a test case the TEST_ARG_{REG,PTR,MEM} macros are
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* used followed by a terminating TEST_ARG_END.
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*
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* After this, the instruction to be tested is defined with TEST_INSTRUCTION.
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* Or for branches, TEST_BRANCH_B and TEST_BRANCH_F (branch forwards/backwards).
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*
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* Some specific test cases may make use of other custom constructs.
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*/
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#if VERBOSE
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#define verbose(fmt, ...) pr_info(fmt, ##__VA_ARGS__)
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#else
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#define verbose(fmt, ...)
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#endif
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#define TEST_GROUP(title) \
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verbose("\n"); \
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verbose(title"\n"); \
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verbose("---------------------------------------------------------\n");
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#define TESTCASE_START(title) \
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__asm__ __volatile__ ( \
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"bl __kprobes_test_case_start \n\t" \
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".pushsection .rodata \n\t" \
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"10: \n\t" \
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/* don't use .asciz here as 'title' may be */ \
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/* multiple strings to be concatenated. */ \
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".ascii "#title" \n\t" \
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".byte 0 \n\t" \
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".popsection \n\t" \
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".word 10b \n\t"
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#define TEST_ARG_REG(reg, val) \
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".byte "__stringify(ARG_TYPE_REG)" \n\t" \
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".byte "#reg" \n\t" \
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".short 0 \n\t" \
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".word "#val" \n\t"
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#define TEST_ARG_PTR(reg, val) \
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".byte "__stringify(ARG_TYPE_PTR)" \n\t" \
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".byte "#reg" \n\t" \
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".short 0 \n\t" \
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".word "#val" \n\t"
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#define TEST_ARG_MEM(index, val) \
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".byte "__stringify(ARG_TYPE_MEM)" \n\t" \
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".byte "#index" \n\t" \
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".short 0 \n\t" \
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".word "#val" \n\t"
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#define TEST_ARG_END(flags) \
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".byte "__stringify(ARG_TYPE_END)" \n\t" \
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".byte "TEST_ISA flags" \n\t" \
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".short 50f-0f \n\t" \
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".short 2f-0f \n\t" \
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".short 99f-0f \n\t" \
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".code "TEST_ISA" \n\t" \
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"0: \n\t"
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#define TEST_INSTRUCTION(instruction) \
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"50: nop \n\t" \
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"1: "instruction" \n\t" \
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" nop \n\t"
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#define TEST_BRANCH_F(instruction) \
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TEST_INSTRUCTION(instruction) \
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" b 99f \n\t" \
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"2: nop \n\t"
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#define TEST_BRANCH_B(instruction) \
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" b 50f \n\t" \
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" b 99f \n\t" \
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"2: nop \n\t" \
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" b 99f \n\t" \
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TEST_INSTRUCTION(instruction)
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#define TEST_BRANCH_FX(instruction, codex) \
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TEST_INSTRUCTION(instruction) \
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" b 99f \n\t" \
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codex" \n\t" \
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" b 99f \n\t" \
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"2: nop \n\t"
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#define TEST_BRANCH_BX(instruction, codex) \
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" b 50f \n\t" \
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" b 99f \n\t" \
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"2: nop \n\t" \
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" b 99f \n\t" \
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codex" \n\t" \
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TEST_INSTRUCTION(instruction)
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#define TESTCASE_END \
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"2: \n\t" \
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"99: \n\t" \
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" bl __kprobes_test_case_end_"TEST_ISA" \n\t" \
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".code "NORMAL_ISA" \n\t" \
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: : \
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: "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc" \
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);
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/*
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* Macros to define test cases.
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*
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* Those of the form TEST_{R,P,M}* can be used to define test cases
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* which take combinations of the three basic types of arguments. E.g.
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*
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* TEST_R One register argument
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* TEST_RR Two register arguments
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* TEST_RPR A register, a pointer, then a register argument
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*
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* For testing instructions which may branch, there are macros TEST_BF_*
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* and TEST_BB_* for branching forwards and backwards.
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*
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* TEST_SUPPORTED and TEST_UNSUPPORTED don't cause the code to be executed,
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* the just verify that a kprobe is or is not allowed on the given instruction.
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*/
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#define TEST(code) \
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TESTCASE_START(code) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code) \
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TESTCASE_END
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#define TEST_UNSUPPORTED(code) \
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TESTCASE_START(code) \
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TEST_ARG_END("|"__stringify(ARG_FLAG_UNSUPPORTED)) \
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TEST_INSTRUCTION(code) \
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TESTCASE_END
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#define TEST_SUPPORTED(code) \
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TESTCASE_START(code) \
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TEST_ARG_END("|"__stringify(ARG_FLAG_SUPPORTED)) \
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TEST_INSTRUCTION(code) \
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TESTCASE_END
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#define TEST_R(code1, reg, val, code2) \
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TESTCASE_START(code1 #reg code2) \
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TEST_ARG_REG(reg, val) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 #reg code2) \
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TESTCASE_END
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#define TEST_RR(code1, reg1, val1, code2, reg2, val2, code3) \
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TESTCASE_START(code1 #reg1 code2 #reg2 code3) \
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TEST_ARG_REG(reg1, val1) \
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TEST_ARG_REG(reg2, val2) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3) \
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TESTCASE_END
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#define TEST_RRR(code1, reg1, val1, code2, reg2, val2, code3, reg3, val3, code4)\
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TESTCASE_START(code1 #reg1 code2 #reg2 code3 #reg3 code4) \
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TEST_ARG_REG(reg1, val1) \
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TEST_ARG_REG(reg2, val2) \
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TEST_ARG_REG(reg3, val3) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3 #reg3 code4) \
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TESTCASE_END
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#define TEST_RRRR(code1, reg1, val1, code2, reg2, val2, code3, reg3, val3, code4, reg4, val4) \
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TESTCASE_START(code1 #reg1 code2 #reg2 code3 #reg3 code4 #reg4) \
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TEST_ARG_REG(reg1, val1) \
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TEST_ARG_REG(reg2, val2) \
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TEST_ARG_REG(reg3, val3) \
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TEST_ARG_REG(reg4, val4) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3 #reg3 code4 #reg4) \
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TESTCASE_END
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#define TEST_P(code1, reg1, val1, code2) \
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TESTCASE_START(code1 #reg1 code2) \
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TEST_ARG_PTR(reg1, val1) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 #reg1 code2) \
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TESTCASE_END
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#define TEST_PR(code1, reg1, val1, code2, reg2, val2, code3) \
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TESTCASE_START(code1 #reg1 code2 #reg2 code3) \
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TEST_ARG_PTR(reg1, val1) \
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TEST_ARG_REG(reg2, val2) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3) \
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TESTCASE_END
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#define TEST_RP(code1, reg1, val1, code2, reg2, val2, code3) \
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TESTCASE_START(code1 #reg1 code2 #reg2 code3) \
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TEST_ARG_REG(reg1, val1) \
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TEST_ARG_PTR(reg2, val2) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3) \
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TESTCASE_END
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#define TEST_PRR(code1, reg1, val1, code2, reg2, val2, code3, reg3, val3, code4)\
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TESTCASE_START(code1 #reg1 code2 #reg2 code3 #reg3 code4) \
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TEST_ARG_PTR(reg1, val1) \
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TEST_ARG_REG(reg2, val2) \
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TEST_ARG_REG(reg3, val3) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3 #reg3 code4) \
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TESTCASE_END
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#define TEST_RPR(code1, reg1, val1, code2, reg2, val2, code3, reg3, val3, code4)\
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TESTCASE_START(code1 #reg1 code2 #reg2 code3 #reg3 code4) \
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TEST_ARG_REG(reg1, val1) \
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TEST_ARG_PTR(reg2, val2) \
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TEST_ARG_REG(reg3, val3) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3 #reg3 code4) \
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TESTCASE_END
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#define TEST_RRP(code1, reg1, val1, code2, reg2, val2, code3, reg3, val3, code4)\
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TESTCASE_START(code1 #reg1 code2 #reg2 code3 #reg3 code4) \
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TEST_ARG_REG(reg1, val1) \
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TEST_ARG_REG(reg2, val2) \
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TEST_ARG_PTR(reg3, val3) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 #reg1 code2 #reg2 code3 #reg3 code4) \
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TESTCASE_END
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#define TEST_BF_P(code1, reg1, val1, code2) \
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TESTCASE_START(code1 #reg1 code2) \
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TEST_ARG_PTR(reg1, val1) \
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TEST_ARG_END("") \
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TEST_BRANCH_F(code1 #reg1 code2) \
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TESTCASE_END
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#define TEST_BF(code) \
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TESTCASE_START(code) \
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TEST_ARG_END("") \
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TEST_BRANCH_F(code) \
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TESTCASE_END
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#define TEST_BB(code) \
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TESTCASE_START(code) \
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TEST_ARG_END("") \
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TEST_BRANCH_B(code) \
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TESTCASE_END
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#define TEST_BF_R(code1, reg, val, code2) \
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TESTCASE_START(code1 #reg code2) \
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TEST_ARG_REG(reg, val) \
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TEST_ARG_END("") \
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TEST_BRANCH_F(code1 #reg code2) \
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TESTCASE_END
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#define TEST_BB_R(code1, reg, val, code2) \
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TESTCASE_START(code1 #reg code2) \
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TEST_ARG_REG(reg, val) \
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TEST_ARG_END("") \
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TEST_BRANCH_B(code1 #reg code2) \
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TESTCASE_END
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#define TEST_BF_RR(code1, reg1, val1, code2, reg2, val2, code3) \
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TESTCASE_START(code1 #reg1 code2 #reg2 code3) \
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TEST_ARG_REG(reg1, val1) \
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TEST_ARG_REG(reg2, val2) \
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TEST_ARG_END("") \
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TEST_BRANCH_F(code1 #reg1 code2 #reg2 code3) \
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TESTCASE_END
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#define TEST_BF_X(code, codex) \
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TESTCASE_START(code) \
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TEST_ARG_END("") \
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TEST_BRANCH_FX(code, codex) \
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TESTCASE_END
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#define TEST_BB_X(code, codex) \
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TESTCASE_START(code) \
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TEST_ARG_END("") \
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TEST_BRANCH_BX(code, codex) \
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TESTCASE_END
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#define TEST_BF_RX(code1, reg, val, code2, codex) \
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TESTCASE_START(code1 #reg code2) \
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TEST_ARG_REG(reg, val) \
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TEST_ARG_END("") \
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TEST_BRANCH_FX(code1 #reg code2, codex) \
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TESTCASE_END
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#define TEST_X(code, codex) \
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TESTCASE_START(code) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code) \
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" b 99f \n\t" \
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" "codex" \n\t" \
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TESTCASE_END
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#define TEST_RX(code1, reg, val, code2, codex) \
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TESTCASE_START(code1 #reg code2) \
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TEST_ARG_REG(reg, val) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 __stringify(reg) code2) \
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" b 99f \n\t" \
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" "codex" \n\t" \
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TESTCASE_END
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#define TEST_RRX(code1, reg1, val1, code2, reg2, val2, code3, codex) \
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TESTCASE_START(code1 #reg1 code2 #reg2 code3) \
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TEST_ARG_REG(reg1, val1) \
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TEST_ARG_REG(reg2, val2) \
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TEST_ARG_END("") \
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TEST_INSTRUCTION(code1 __stringify(reg1) code2 __stringify(reg2) code3) \
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" b 99f \n\t" \
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" "codex" \n\t" \
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TESTCASE_END
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/*
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* Macros for defining space directives spread over multiple lines.
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* These are required so the compiler guesses better the length of inline asm
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* code and will spill the literal pool early enough to avoid generating PC
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* relative loads with out of range offsets.
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*/
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#define TWICE(x) x x
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#define SPACE_0x8 TWICE(".space 4\n\t")
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#define SPACE_0x10 TWICE(SPACE_0x8)
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#define SPACE_0x20 TWICE(SPACE_0x10)
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#define SPACE_0x40 TWICE(SPACE_0x20)
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#define SPACE_0x80 TWICE(SPACE_0x40)
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#define SPACE_0x100 TWICE(SPACE_0x80)
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#define SPACE_0x200 TWICE(SPACE_0x100)
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#define SPACE_0x400 TWICE(SPACE_0x200)
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#define SPACE_0x800 TWICE(SPACE_0x400)
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#define SPACE_0x1000 TWICE(SPACE_0x800)
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/* Various values used in test cases... */
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#define N(val) (val ^ 0xffffffff)
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#define VAL1 0x12345678
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#define VAL2 N(VAL1)
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#define VAL3 0xa5f801
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#define VAL4 N(VAL3)
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#define VALM 0x456789ab
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#define VALR 0xdeaddead
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#define HH1 0x0123fecb
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#define HH2 0xa9874567
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#ifdef CONFIG_THUMB2_KERNEL
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void kprobe_thumb16_test_cases(void);
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void kprobe_thumb32_test_cases(void);
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#else
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void kprobe_arm_test_cases(void);
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#endif
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