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>
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@ -110,6 +110,7 @@ static int bsesc(void);
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static void dump(void);
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static void prdump(unsigned long, long);
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static int ppc_inst_dump(unsigned long, long, int);
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static void dump_log_buf(void);
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static void backtrace(struct pt_regs *);
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static void excprint(struct pt_regs *);
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static void prregs(struct pt_regs *);
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@ -197,6 +198,7 @@ Commands:\n\
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di dump instructions\n\
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df dump float values\n\
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dd dump double values\n\
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dl dump the kernel log buffer\n\
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dr dump stream of raw bytes\n\
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e print exception information\n\
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f flush cache\n\
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@ -2009,6 +2011,8 @@ dump(void)
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nidump = MAX_DUMP;
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adrs += ppc_inst_dump(adrs, nidump, 1);
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last_cmd = "di\n";
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} else if (c == 'l') {
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dump_log_buf();
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} else if (c == 'r') {
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scanhex(&ndump);
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if (ndump == 0)
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@ -2122,6 +2126,49 @@ print_address(unsigned long addr)
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xmon_print_symbol(addr, "\t# ", "");
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}
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void
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dump_log_buf(void)
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{
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const unsigned long size = 128;
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unsigned long i, end, addr;
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unsigned char buf[size + 1];
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addr = 0;
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buf[size] = '\0';
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if (setjmp(bus_error_jmp) != 0) {
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printf("Unable to lookup symbol __log_buf!\n");
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return;
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}
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catch_memory_errors = 1;
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sync();
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addr = kallsyms_lookup_name("__log_buf");
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if (! addr)
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printf("Symbol __log_buf not found!\n");
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else {
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end = addr + (1 << CONFIG_LOG_BUF_SHIFT);
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while (addr < end) {
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if (! mread(addr, buf, size)) {
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printf("Can't read memory at address 0x%lx\n", addr);
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break;
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}
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printf("%s", buf);
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if (strlen(buf) < size)
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break;
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addr += size;
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}
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}
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sync();
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/* wait a little while to see if we get a machine check */
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__delay(200);
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catch_memory_errors = 0;
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}
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/*
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* Memory operations - move, set, print differences
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