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1da177e4 | 1 | #include <linux/kernel.h> |
1da177e4 LT |
2 | |
3 | typedef unsigned int instr; | |
4 | ||
5 | #define MAJOR_OP 0xfc000000 | |
6 | #define LDA_OP 0x20000000 | |
7 | #define STQ_OP 0xb4000000 | |
8 | #define BR_OP 0xc0000000 | |
9 | ||
10 | #define STK_ALLOC_1 0x23de8000 /* lda $30,-X($30) */ | |
11 | #define STK_ALLOC_1M 0xffff8000 | |
12 | #define STK_ALLOC_2 0x43c0153e /* subq $30,X,$30 */ | |
13 | #define STK_ALLOC_2M 0xffe01fff | |
14 | ||
15 | #define MEM_REG 0x03e00000 | |
16 | #define MEM_BASE 0x001f0000 | |
17 | #define MEM_OFF 0x0000ffff | |
18 | #define MEM_OFF_SIGN 0x00008000 | |
19 | #define BASE_SP 0x001e0000 | |
20 | ||
21 | #define STK_ALLOC_MATCH(INSTR) \ | |
22 | (((INSTR) & STK_ALLOC_1M) == STK_ALLOC_1 \ | |
23 | || ((INSTR) & STK_ALLOC_2M) == STK_ALLOC_2) | |
24 | #define STK_PUSH_MATCH(INSTR) \ | |
25 | (((INSTR) & (MAJOR_OP | MEM_BASE | MEM_OFF_SIGN)) == (STQ_OP | BASE_SP)) | |
26 | #define MEM_OP_OFFSET(INSTR) \ | |
27 | (((long)((INSTR) & MEM_OFF) << 48) >> 48) | |
28 | #define MEM_OP_REG(INSTR) \ | |
29 | (((INSTR) & MEM_REG) >> 22) | |
30 | ||
31 | /* Branches, jumps, PAL calls, and illegal opcodes end a basic block. */ | |
32 | #define BB_END(INSTR) \ | |
33 | (((instr)(INSTR) >= BR_OP) | ((instr)(INSTR) < LDA_OP) | \ | |
34 | ((((instr)(INSTR) ^ 0x60000000) < 0x20000000) & \ | |
35 | (((instr)(INSTR) & 0x0c000000) != 0))) | |
36 | ||
37 | #define IS_KERNEL_TEXT(PC) ((unsigned long)(PC) > START_ADDR) | |
38 | ||
39 | static char reg_name[][4] = { | |
40 | "v0 ", "t0 ", "t1 ", "t2 ", "t3 ", "t4 ", "t5 ", "t6 ", "t7 ", | |
41 | "s0 ", "s1 ", "s2 ", "s3 ", "s4 ", "s5 ", "s6 ", "a0 ", "a1 ", | |
42 | "a2 ", "a3 ", "a4 ", "a5 ", "t8 ", "t9 ", "t10", "t11", "ra ", | |
43 | "pv ", "at ", "gp ", "sp ", "0" | |
44 | }; | |
45 | ||
46 | ||
47 | static instr * | |
48 | display_stored_regs(instr * pro_pc, unsigned char * sp) | |
49 | { | |
50 | instr * ret_pc = 0; | |
51 | int reg; | |
52 | unsigned long value; | |
53 | ||
54 | printk("Prologue [<%p>], Frame %p:\n", pro_pc, sp); | |
55 | while (!BB_END(*pro_pc)) | |
56 | if (STK_PUSH_MATCH(*pro_pc)) { | |
57 | reg = (*pro_pc & MEM_REG) >> 21; | |
58 | value = *(unsigned long *)(sp + (*pro_pc & MEM_OFF)); | |
59 | if (reg == 26) | |
60 | ret_pc = (instr *)value; | |
61 | printk("\t\t%s / 0x%016lx\n", reg_name[reg], value); | |
62 | } | |
63 | return ret_pc; | |
64 | } | |
65 | ||
66 | static instr * | |
67 | seek_prologue(instr * pc) | |
68 | { | |
69 | while (!STK_ALLOC_MATCH(*pc)) | |
70 | --pc; | |
71 | while (!BB_END(*(pc - 1))) | |
72 | --pc; | |
73 | return pc; | |
74 | } | |
75 | ||
76 | static long | |
77 | stack_increment(instr * prologue_pc) | |
78 | { | |
79 | while (!STK_ALLOC_MATCH(*prologue_pc)) | |
80 | ++prologue_pc; | |
81 | ||
82 | /* Count the bytes allocated. */ | |
83 | if ((*prologue_pc & STK_ALLOC_1M) == STK_ALLOC_1M) | |
84 | return -(((long)(*prologue_pc) << 48) >> 48); | |
85 | else | |
86 | return (*prologue_pc >> 13) & 0xff; | |
87 | } | |
88 | ||
89 | void | |
90 | stacktrace(void) | |
91 | { | |
92 | instr * ret_pc; | |
93 | instr * prologue = (instr *)stacktrace; | |
94 | register unsigned char * sp __asm__ ("$30"); | |
95 | ||
96 | printk("\tstack trace:\n"); | |
97 | do { | |
98 | ret_pc = display_stored_regs(prologue, sp); | |
99 | sp += stack_increment(prologue); | |
100 | prologue = seek_prologue(ret_pc); | |
101 | } while (IS_KERNEL_TEXT(ret_pc)); | |
102 | } |