| 1 | |
| 2 | #include <linux/kernel.h>
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| 3 |
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| 4 | typedef unsigned int instr;
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| 5 |
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| 6 | #define MAJOR_OP 0xfc000000
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| 7 | #define LDA_OP 0x20000000
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| 8 | #define STQ_OP 0xb4000000
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| 9 | #define BR_OP 0xc0000000
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| 10 |
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| 11 | #define STK_ALLOC_1 0x23de8000
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| 12 | #define STK_ALLOC_1M 0xffff8000
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| 13 | #define STK_ALLOC_2 0x43c0153e
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| 14 | #define STK_ALLOC_2M 0xffe01fff
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| 15 |
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| 16 | #define MEM_REG 0x03e00000
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| 17 | #define MEM_BASE 0x001f0000
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| 18 | #define MEM_OFF 0x0000ffff
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| 19 | #define MEM_OFF_SIGN 0x00008000
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| 20 | #define BASE_SP 0x001e0000
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| 21 |
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| 22 | #define STK_ALLOC_MATCH(INSTR) \
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| 23 | (((INSTR) & STK_ALLOC_1M) == STK_ALLOC_1 \
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| 24 | || ((INSTR) & STK_ALLOC_2M) == STK_ALLOC_2)
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| 25 | #define STK_PUSH_MATCH(INSTR) \
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| 26 | (((INSTR) & (MAJOR_OP | MEM_BASE | MEM_OFF_SIGN)) == (STQ_OP | BASE_SP))
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| 27 | #define MEM_OP_OFFSET(INSTR) \
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| 28 | (((long)((INSTR) & MEM_OFF) << 48) >> 48)
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| 29 | #define MEM_OP_REG(INSTR) \
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| 30 | (((INSTR) & MEM_REG) >> 22)
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| 31 |
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| 32 |
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| 33 | #define BB_END(INSTR) \
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| 34 | (((instr)(INSTR) >= BR_OP) | ((instr)(INSTR) < LDA_OP) | \
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| 35 | ((((instr)(INSTR) ^ 0x60000000) < 0x20000000) & \
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| 36 | (((instr)(INSTR) & 0x0c000000) != 0)))
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| 37 |
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| 38 | #define IS_KERNEL_TEXT(PC) ((unsigned long)(PC) > START_ADDR)
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| 39 |
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| 40 | static char reg_name[][4] = {
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| 41 | "v0 ", "t0 ", "t1 ", "t2 ", "t3 ", "t4 ", "t5 ", "t6 ", "t7 ",
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| 42 | "s0 ", "s1 ", "s2 ", "s3 ", "s4 ", "s5 ", "s6 ", "a0 ", "a1 ",
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| 43 | "a2 ", "a3 ", "a4 ", "a5 ", "t8 ", "t9 ", "t10", "t11", "ra ",
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| 44 | "pv ", "at ", "gp ", "sp ", "0"
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| 45 | };
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| 46 |
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| 47 |
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| 48 | static instr *
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| 49 | display_stored_regs(instr * pro_pc, unsigned char * sp)
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| 50 | {
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| 51 | instr * ret_pc = 0;
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| 52 | int reg;
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| 53 | unsigned long value;
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| 54 |
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| 55 | printk("Prologue [<%p>], Frame %p:\n", pro_pc, sp);
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| 56 | while (!BB_END(*pro_pc))
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| 57 | if (STK_PUSH_MATCH(*pro_pc)) {
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| 58 | reg = (*pro_pc & MEM_REG) >> 21;
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| 59 | value = *(unsigned long *)(sp + (*pro_pc & MEM_OFF));
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| 60 | if (reg == 26)
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| 61 | ret_pc = (instr *)value;
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| 62 | printk("\t\t%s / 0x%016lx\n", reg_name[reg], value);
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| 63 | }
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| 64 | return ret_pc;
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| 65 | }
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| 66 |
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| 67 | static instr *
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| 68 | seek_prologue(instr * pc)
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| 69 | {
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| 70 | while (!STK_ALLOC_MATCH(*pc))
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| 71 | --pc;
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| 72 | while (!BB_END(*(pc - 1)))
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| 73 | --pc;
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| 74 | return pc;
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| 75 | }
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| 76 |
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| 77 | static long
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| 78 | stack_increment(instr * prologue_pc)
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| 79 | {
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| 80 | while (!STK_ALLOC_MATCH(*prologue_pc))
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| 81 | ++prologue_pc;
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| 82 |
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| 83 |
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| 84 | if ((*prologue_pc & STK_ALLOC_1M) == STK_ALLOC_1M)
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| 85 | return -(((long)(*prologue_pc) << 48) >> 48);
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| 86 | else
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| 87 | return (*prologue_pc >> 13) & 0xff;
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| 88 | }
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| 89 |
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| 90 | void
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| 91 | stacktrace(void)
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| 92 | {
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| 93 | instr * ret_pc;
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| 94 | instr * prologue = (instr *)stacktrace;
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| 95 | unsigned char *sp = (unsigned char *)current_stack_pointer;
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| 96 |
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| 97 | printk("\tstack trace:\n");
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| 98 | do {
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| 99 | ret_pc = display_stored_regs(prologue, sp);
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| 100 | sp += stack_increment(prologue);
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| 101 | prologue = seek_prologue(ret_pc);
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| 102 | } while (IS_KERNEL_TEXT(ret_pc));
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| 103 | }
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