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powerpc/xmon: Add dl command to dump contents of __log_buf

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Hello All,

Quite a while back Michael Ellerman had posted a patch to add support to xmon to print the contents of the console log pointed to by __log_buf.
Here's the link to that patch - http://ozlabs.org/pipermail/linuxppc64-dev/2005-March/003657.html
I've ported the patch in the above link to 2.6.30-rc5 and have tested it.

Thanks & regards,
Vinay

Signed-off-by: Michael Ellerman <michael at ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Vinay Sridhar 2009-05-14 23:13:07 +00:00 committed by Benjamin Herrenschmidt
parent 2138422bba
commit f312deb4cd
1 changed files with 47 additions and 0 deletions
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47
arch/powerpc/xmon/xmon.c
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@ -110,6 +110,7 @@ static int bsesc(void);
static void dump(void);
static void prdump(unsigned long, long);
static int ppc_inst_dump(unsigned long, long, int);
static void dump_log_buf(void);
static void backtrace(struct pt_regs *);
static void excprint(struct pt_regs *);
static void prregs(struct pt_regs *);
@ -197,6 +198,7 @@ Commands:\n\
di dump instructions\n\
df dump float values\n\
dd dump double values\n\
dl dump the kernel log buffer\n\
dr dump stream of raw bytes\n\
e print exception information\n\
f flush cache\n\
@ -2009,6 +2011,8 @@ dump(void)
nidump = MAX_DUMP;
adrs += ppc_inst_dump(adrs, nidump, 1);
last_cmd = "di\n";
} else if (c == 'l') {
dump_log_buf();
} else if (c == 'r') {
scanhex(&ndump);
if (ndump == 0)
@ -2122,6 +2126,49 @@ print_address(unsigned long addr)
xmon_print_symbol(addr, "\t# ", "");
}
void
dump_log_buf(void)
{
const unsigned long size = 128;
unsigned long i, end, addr;
unsigned char buf[size + 1];
addr = 0;
buf[size] = '\0';
if (setjmp(bus_error_jmp) != 0) {
printf("Unable to lookup symbol __log_buf!\n");
return;
}
catch_memory_errors = 1;
sync();
addr = kallsyms_lookup_name("__log_buf");
if (! addr)
printf("Symbol __log_buf not found!\n");
else {
end = addr + (1 << CONFIG_LOG_BUF_SHIFT);
while (addr < end) {
if (! mread(addr, buf, size)) {
printf("Can't read memory at address 0x%lx\n", addr);
break;
}
printf("%s", buf);
if (strlen(buf) < size)
break;
addr += size;
}
}
sync();
/* wait a little while to see if we get a machine check */
__delay(200);
catch_memory_errors = 0;
}
/*
* Memory operations - move, set, print differences