stacktrace.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- #include <linux/kernel.h>
- #include <asm/system.h>
- typedef unsigned int instr;
- #define MAJOR_OP 0xfc000000
- #define LDA_OP 0x20000000
- #define STQ_OP 0xb4000000
- #define BR_OP 0xc0000000
- #define STK_ALLOC_1 0x23de8000 /* lda $30,-X($30) */
- #define STK_ALLOC_1M 0xffff8000
- #define STK_ALLOC_2 0x43c0153e /* subq $30,X,$30 */
- #define STK_ALLOC_2M 0xffe01fff
- #define MEM_REG 0x03e00000
- #define MEM_BASE 0x001f0000
- #define MEM_OFF 0x0000ffff
- #define MEM_OFF_SIGN 0x00008000
- #define BASE_SP 0x001e0000
- #define STK_ALLOC_MATCH(INSTR)
- (((INSTR) & STK_ALLOC_1M) == STK_ALLOC_1
- || ((INSTR) & STK_ALLOC_2M) == STK_ALLOC_2)
- #define STK_PUSH_MATCH(INSTR)
- (((INSTR) & (MAJOR_OP | MEM_BASE | MEM_OFF_SIGN)) == (STQ_OP | BASE_SP))
- #define MEM_OP_OFFSET(INSTR)
- (((long)((INSTR) & MEM_OFF) << 48) >> 48)
- #define MEM_OP_REG(INSTR)
- (((INSTR) & MEM_REG) >> 22)
- /* Branches, jumps, PAL calls, and illegal opcodes end a basic block. */
- #define BB_END(INSTR)
- (((instr)(INSTR) >= BR_OP) | ((instr)(INSTR) < LDA_OP) |
- ((((instr)(INSTR) ^ 0x60000000) < 0x20000000) &
- (((instr)(INSTR) & 0x0c000000) != 0)))
- #define IS_KERNEL_TEXT(PC) ((unsigned long)(PC) > START_ADDR)
- static char reg_name[][4] = {
- "v0 ", "t0 ", "t1 ", "t2 ", "t3 ", "t4 ", "t5 ", "t6 ", "t7 ",
- "s0 ", "s1 ", "s2 ", "s3 ", "s4 ", "s5 ", "s6 ", "a0 ", "a1 ",
- "a2 ", "a3 ", "a4 ", "a5 ", "t8 ", "t9 ", "t10", "t11", "ra ",
- "pv ", "at ", "gp ", "sp ", "0"
- };
- static instr *
- display_stored_regs(instr * pro_pc, unsigned char * sp)
- {
- instr * ret_pc = 0;
- int reg;
- unsigned long value;
- printk("Prologue [<%p>], Frame %p:n", pro_pc, sp);
- while (!BB_END(*pro_pc))
- if (STK_PUSH_MATCH(*pro_pc)) {
- reg = (*pro_pc & MEM_REG) >> 21;
- value = *(unsigned long *)(sp + (*pro_pc & MEM_OFF));
- if (reg == 26)
- ret_pc = (instr *)value;
- printk("tt%s / 0x%016lxn", reg_name[reg], value);
- }
- return ret_pc;
- }
- static instr *
- seek_prologue(instr * pc)
- {
- while (!STK_ALLOC_MATCH(*pc))
- --pc;
- while (!BB_END(*(pc - 1)))
- --pc;
- return pc;
- }
- static long
- stack_increment(instr * prologue_pc)
- {
- while (!STK_ALLOC_MATCH(*prologue_pc))
- ++prologue_pc;
- /* Count the bytes allocated. */
- if ((*prologue_pc & STK_ALLOC_1M) == STK_ALLOC_1M)
- return -(((long)(*prologue_pc) << 48) >> 48);
- else
- return (*prologue_pc >> 13) & 0xff;
- }
- void
- stacktrace(void)
- {
- instr * ret_pc;
- instr * prologue = (instr *)stacktrace;
- register unsigned char * sp __asm__ ("$30");
- printk("tstack trace:n");
- do {
- ret_pc = display_stored_regs(prologue, sp);
- sp += stack_increment(prologue);
- prologue = seek_prologue(ret_pc);
- } while (IS_KERNEL_TEXT(ret_pc));
- }