redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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>
hifive-unleashed-5.1
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
arch/powerpc/xmon/xmon.c
View File

@ -110,6 +110,7 @@ static int bsesc(void);
static void dump(void); static void dump(void);
static void prdump(unsigned long, long); static void prdump(unsigned long, long);
static int ppc_inst_dump(unsigned long, long, int); static int ppc_inst_dump(unsigned long, long, int);
static void dump_log_buf(void);
static void backtrace(struct pt_regs *); static void backtrace(struct pt_regs *);
static void excprint(struct pt_regs *); static void excprint(struct pt_regs *);
static void prregs(struct pt_regs *); static void prregs(struct pt_regs *);
@ -197,6 +198,7 @@ Commands:\n\
di dump instructions\n\ di dump instructions\n\
df dump float values\n\ df dump float values\n\
dd dump double values\n\ dd dump double values\n\
dl dump the kernel log buffer\n\
dr dump stream of raw bytes\n\ dr dump stream of raw bytes\n\
e print exception information\n\ e print exception information\n\
f flush cache\n\ f flush cache\n\
@ -2009,6 +2011,8 @@ dump(void)
nidump = MAX_DUMP; nidump = MAX_DUMP;
adrs += ppc_inst_dump(adrs, nidump, 1); adrs += ppc_inst_dump(adrs, nidump, 1);
last_cmd = "di\n"; last_cmd = "di\n";
} else if (c == 'l') {
dump_log_buf();
} else if (c == 'r') { } else if (c == 'r') {
scanhex(&ndump); scanhex(&ndump);
if (ndump == 0) if (ndump == 0)
@ -2122,6 +2126,49 @@ print_address(unsigned long addr)
xmon_print_symbol(addr, "\t# ", ""); 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 * Memory operations - move, set, print differences