104 lines
2.6 KiB
C
104 lines
2.6 KiB
C
#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("\t\t%s / 0x%016lx\n", 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));
|
|
}
|