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Blackfin arch: Fix bug - when expanding the trace buffer, it does not print out the decoded instruction. 

as pointed out by Michael McTernan in the forums, when expanding
the trace buffer, it does not print out the decoded instruction.

Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
This commit is contained in:
Robin Getz 2008-08-06 17:49:27 +08:00 committed by Bryan Wu
parent 56f5f59052
commit d3d0ac23a3
1 changed files with 53 additions and 35 deletions
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88
arch/blackfin/kernel/traps.c
View File

@ -601,12 +601,55 @@ bool get_instruction(unsigned short *val, unsigned short *address)
return false;
}
/*
* decode the instruction if we are printing out the trace, as it
* makes things easier to follow, without running it through objdump
* These are the normal instructions which cause change of flow, which
* would be at the source of the trace buffer
*/
void decode_instruction(unsigned short *address)
{
unsigned short opcode;
if (get_instruction(&opcode, address)) {
if (opcode == 0x0010)
printk("RTS");
else if (opcode == 0x0011)
printk("RTI");
else if (opcode == 0x0012)
printk("RTX");
else if (opcode >= 0x0050 && opcode <= 0x0057)
printk("JUMP (P%i)", opcode & 7);
else if (opcode >= 0x0060 && opcode <= 0x0067)
printk("CALL (P%i)", opcode & 7);
else if (opcode >= 0x0070 && opcode <= 0x0077)
printk("CALL (PC+P%i)", opcode & 7);
else if (opcode >= 0x0080 && opcode <= 0x0087)
printk("JUMP (PC+P%i)", opcode & 7);
else if ((opcode >= 0x1000 && opcode <= 0x13FF) || (opcode >= 0x1800 && opcode <= 0x1BFF))
printk("IF !CC JUMP");
else if ((opcode >= 0x1400 && opcode <= 0x17ff) || (opcode >= 0x1c00 && opcode <= 0x1fff))
printk("IF CC JUMP");
else if (opcode >= 0x2000 && opcode <= 0x2fff)
printk("JUMP.S");
else if (opcode >= 0xe080 && opcode <= 0xe0ff)
printk("LSETUP");
else if (opcode >= 0xe200 && opcode <= 0xe2ff)
printk("JUMP.L");
else if (opcode >= 0xe300 && opcode <= 0xe3ff)
printk("CALL pcrel");
else
printk("0x%04x", opcode);
}
}
void dump_bfin_trace_buffer(void)
{
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_ON
int tflags, i = 0;
char buf[150];
unsigned short val = 0, *addr;
unsigned short *addr;
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
int j, index;
#endif
@ -615,6 +658,10 @@ void dump_bfin_trace_buffer(void)
printk(KERN_NOTICE "Hardware Trace:\n");
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
printk(KERN_NOTICE "WARNING: Expanded trace turned on - can not trace exceptions\n");
#endif
if (likely(bfin_read_TBUFSTAT() & TBUFCNT)) {
for (; bfin_read_TBUFSTAT() & TBUFCNT; i++) {
decode_address(buf, (unsigned long)bfin_read_TBUF());
@ -622,45 +669,14 @@ void dump_bfin_trace_buffer(void)
addr = (unsigned short *)bfin_read_TBUF();
decode_address(buf, (unsigned long)addr);
printk(KERN_NOTICE " Source : %s ", buf);
if (get_instruction(&val, addr)) {
if (val == 0x0010)
printk("RTS");
else if (val == 0x0011)
printk("RTI");
else if (val == 0x0012)
printk("RTX");
else if (val >= 0x0050 && val <= 0x0057)
printk("JUMP (P%i)", val & 7);
else if (val >= 0x0060 && val <= 0x0067)
printk("CALL (P%i)", val & 7);
else if (val >= 0x0070 && val <= 0x0077)
printk("CALL (PC+P%i)", val & 7);
else if (val >= 0x0080 && val <= 0x0087)
printk("JUMP (PC+P%i)", val & 7);
else if ((val >= 0x1000 && val <= 0x13FF) ||
(val >= 0x1800 && val <= 0x1BFF))
printk("IF !CC JUMP");
else if ((val >= 0x1400 && val <= 0x17ff) ||
(val >= 0x1c00 && val <= 0x1fff))
printk("IF CC JUMP");
else if (val >= 0x2000 && val <= 0x2fff)
printk("JUMP.S");
else if (val >= 0xe080 && val <= 0xe0ff)
printk("LSETUP");
else if (val >= 0xe200 && val <= 0xe2ff)
printk("JUMP.L");
else if (val >= 0xe300 && val <= 0xe3ff)
printk("CALL pcrel");
else
printk("0x%04x", val);
}
decode_instruction(addr);
printk("\n");
}
}
#ifdef CONFIG_DEBUG_BFIN_HWTRACE_EXPAND
if (trace_buff_offset)
index = trace_buff_offset/4 - 1;
index = trace_buff_offset / 4;
else
index = EXPAND_LEN;
@ -672,7 +688,9 @@ void dump_bfin_trace_buffer(void)
if (index < 0 )
index = EXPAND_LEN;
decode_address(buf, software_trace_buff[index]);
printk(KERN_NOTICE " Source : %s\n", buf);
printk(KERN_NOTICE " Source : %s ", buf);
decode_instruction((unsigned short *)software_trace_buff[index]);
printk("\n");
index -= 1;
if (index < 0)
index = EXPAND_LEN;