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README.arm-relocation: get relocated address in gdb

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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>
Acked-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Ben Gardiner 2011-04-28 11:03:21 +00:00 committed by Wolfgang Denk
parent f4379ceff0
commit 7124015ada
1 changed files with 8 additions and 0 deletions
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doc/README.arm-relocation
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@ -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 :-)