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authorVinay Sridhar <vinay@linux.vnet.ibm.com>2009-05-14 23:13:07 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2009-05-21 15:44:25 +1000
commitf312deb4cd0c88196edf6dab192b7d42514398d6 (patch)
tree0275f78483b3285994ff6c791b82628615bf00ad /arch/powerpc/xmon/xmon.c
parent2138422bbab91c3e924c9836e394f4925b456b79 (diff)
powerpc/xmon: Add dl command to dump contents of __log_buf
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>
Diffstat (limited to 'arch/powerpc/xmon/xmon.c')
-rw-r--r--arch/powerpc/xmon/xmon.c47
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c
index 8dfad7d9a004..08121d3e47ba 100644
--- a/arch/powerpc/xmon/xmon.c
+++ b/arch/powerpc/xmon/xmon.c
@@ -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