[Skiboot] [PATCH] mambo: Add skiboot/linux symbol lookup

[Oliver O'Halloran]

Adds the skisym and linsym commands which can be used to find the
address of a Linux or Skiboot symbol. To function this requires
the user to provide the SKIBOOT_MAP and VMLINUX_MAP environmental
variables which indicate which skiboot.map and System.map files
should be used.

Examples:

Look up a symbol address:

	systemsim % skisym .load_and_boot_kernel
	0x0000000030013a08

Set a breakpoint there:

	systemsim % b [skisym .load_and_boot_kernel]
	breakpoint set at [0:0]: 0x0000000030013a08 (0x0000000030013A08) Enc:0x7D800026 : mfcr    r12

Signed-off-by: Oliver O'Halloran <oohall at gmail.com>
---
 external/mambo/mambo_utils.tcl | 34 ++++++++++++++++++++++++++++++++++
 external/mambo/skiboot.tcl     | 16 ++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/external/mambo/mambo_utils.tcl b/external/mambo/mambo_utils.tcl
index 6615ef1e3d3d..837ae9b06abe 100644
--- a/external/mambo/mambo_utils.tcl
+++ b/external/mambo/mambo_utils.tcl
@@ -329,6 +329,40 @@ proc doff { opt } {
     simdebug set $opt 0
 }
 
+# skisym and linsym return the address of a symbol, looked up from
+# the relevant System.map or skiboot.map file.
+proc linsym { name } {
+    global linux_symbol_map
+
+    # create a regexp that matches the symbol name
+    set base {([[:xdigit:]]*) (.)}
+    set exp [concat $base " $name"]
+    set ret ""
+
+    foreach {line addr type} [regexp -line -inline $exp $linux_symbol_map] {
+        set ret "0x$addr"
+    }
+
+    return $ret
+}
+
+# skisym factors in skiboot's load address
+proc skisym { name } {
+    global skiboot_symbol_map
+    global mconf
+
+    set base {([[:xdigit:]]*) (.)}
+    set exp [concat $base " $name"]
+    set ret ""
+
+    foreach {line addr type} [regexp -line -inline $exp $skiboot_symbol_map] {
+        set actual_addr [expr "0x$addr" + $mconf(boot_load)]
+	set ret [format "0x%.16x" $actual_addr]
+    }
+
+    return $ret
+}
+
 proc start_qtrace { { qtfile qtrace.qt } } {
     global env
 
diff --git a/external/mambo/skiboot.tcl b/external/mambo/skiboot.tcl
index e16a21c992ef..1b74c9bc5f3d 100644
--- a/external/mambo/skiboot.tcl
+++ b/external/mambo/skiboot.tcl
@@ -105,6 +105,22 @@ if {![info exists of::encode_compat]} {
 # allows running mambo in another directory to the one skiboot.tcl is in.
 if { [file exists mambo_utils.tcl] } then {
 	source mambo_utils.tcl
+
+	if { [info exists env(VMLINUX_MAP)] } {
+		global linux_symbol_map
+
+		set fp [open $env(VMLINUX_MAP) r]
+		set linux_symbol_map [read $fp]
+		close $fp
+	}
+
+	if { [info exists env(SKIBOOT_MAP)] } {
+		global skiboot_symbol_map
+
+		set fp [open $env(SKIBOOT_MAP) r]
+		set skiboot_symbol_map [read $fp]
+		close $fp
+	}
 }
 
 #
-- 
2.9.3