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authorMike Frysinger <vapier@gentoo.org>2009-05-20 04:35:14 -0400
committerWolfgang Denk <wd@denx.de>2009-06-12 20:45:48 +0200
commitecb1dc892297d5d99876907328fed732feefeab2 (patch)
tree60f14fd9310612bb4ee23d819d9f8fad859beda7 /common
parent36c9169aa6f79ddf604a3bca64e145654f94888b (diff)
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Add support for Linux-like kallsysms
The kernel stores address<->symbol names in it so things can be decoded at runtime. Do it in U-Boot, and we get nice symbol decoding when crashing. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'common')
-rw-r--r--common/Makefile1
-rw-r--r--common/kallsyms.c44
-rw-r--r--common/system_map.c8
3 files changed, 53 insertions, 0 deletions
diff --git a/common/Makefile b/common/Makefile
index 2ca1026..ee0cb33 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -153,6 +153,7 @@ COBJS-$(CONFIG_CMD_DOC) += docecc.o
COBJS-$(CONFIG_CONSOLE_MUX) += iomux.o
COBJS-y += flash.o
COBJS-$(CONFIG_CMD_KGDB) += kgdb.o
+COBJS-$(CONFIG_KALLSYMS) += kallsyms.o
COBJS-$(CONFIG_LCD) += lcd.o
COBJS-$(CONFIG_LYNXKDI) += lynxkdi.o
COBJS-$(CONFIG_MODEM_SUPPORT) += modem.o
diff --git a/common/kallsyms.c b/common/kallsyms.c
new file mode 100644
index 0000000..ce42a93
--- /dev/null
+++ b/common/kallsyms.c
@@ -0,0 +1,44 @@
+/*
+ * Helper functions for working with the builtin symbol table
+ *
+ * Copyright (c) 2008-2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <common.h>
+
+/* We need the weak marking as this symbol is provided specially */
+extern const char system_map[] __attribute__((weak));
+
+/* Given an address, return a pointer to the symbol name and store
+ * the base address in caddr. So if the symbol map had an entry:
+ * 03fb9b7c_spi_cs_deactivate
+ * Then the following call:
+ * unsigned long base;
+ * const char *sym = symbol_lookup(0x03fb9b80, &base);
+ * Would end up setting the variables like so:
+ * base = 0x03fb9b7c;
+ * sym = "_spi_cs_deactivate";
+ */
+const char *symbol_lookup(unsigned long addr, unsigned long *caddr)
+{
+ const char *sym, *csym;
+ char *esym;
+ unsigned long sym_addr;
+
+ sym = system_map;
+ csym = NULL;
+ *caddr = 0;
+
+ while (*sym) {
+ sym_addr = simple_strtoul(sym, &esym, 16);
+ sym = esym;
+ if (sym_addr > addr)
+ break;
+ *caddr = sym_addr;
+ csym = sym;
+ sym += strlen(sym) + 1;
+ }
+
+ return csym;
+}
diff --git a/common/system_map.c b/common/system_map.c
new file mode 100644
index 0000000..8307293
--- /dev/null
+++ b/common/system_map.c
@@ -0,0 +1,8 @@
+/*
+ * The builtin symbol table for use with kallsyms
+ *
+ * Copyright (c) 2008-2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+const char const system_map[] = SYSTEM_MAP;