[U-Boot] [PATCH v3 2/2] README.arm-relocation: get relocated address in gdb

Ben Gardiner
2011-04-28T21:03:21Z

When your emulator is connected at reset (or is used to load u-boot)
it is possible to get the relocation address from the gd->relocaddr
since gd is always in r8 (on ARM) it is addressable before the
gdb has remapped symbols.

Document this alternate method in-line with the original method
written by Heiko Schocher.

Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
CC: Heiko Schocher <hs@denx.de>
CC: Wolfgang Denk <wd@denx.de>

---
Changes since V2:
* add gd->relocaddr as a secondary method of obtaining the symbol-file
gdb argument
Changes since V1:
* update to reflect proposed changes to existing debug instructions:
renumber steps, remove note about -DDEBUG
---
doc/README.arm-relocation | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/doc/README.arm-relocation b/doc/README.arm-relocation
index 8bfb500..45f5ea7 100644
--- a/doc/README.arm-relocation
+++ b/doc/README.arm-relocation
@@ -164,6 +164,7 @@ Program received signal SIGSTOP, Stopped (signal).
add-symbol-file u-boot 0x8ff08000
^^^^^^^^^^
get this address from u-boot bdinfo command
+ or get it from gd->relocaddr in gdb

=> bdinfo
rch_number = XXXXXXXXXX
@@ -182,4 +183,11 @@ irq_sp = XXXXXXXXXX
sp start = XXXXXXXXXX
FB base = XXXXXXXXXX

+or interrupt execution by any means and re-load the symbols at the location
+specified by gd->relocaddr -- this is only valid after board_init_f.
+
+(gdb) set $s = gd->relocaddr
+(gdb) symbol-file
+(gdb) add-symbol-file u-boot $s
+
Now you can use gdb as usual :-)
--
1.7.1