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[Bug tdep/16717] New: Reading in code space on AVR with a literal value shifts the address.
- From: "pierre.langlois at embecosm dot com" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Mon, 17 Mar 2014 16:11:48 +0000
- Subject: [Bug tdep/16717] New: Reading in code space on AVR with a literal value shifts the address.
- Auto-submitted: auto-generated
https://sourceware.org/bugzilla/show_bug.cgi?id=16717
Bug ID: 16717
Summary: Reading in code space on AVR with a literal value
shifts the address.
Product: gdb
Version: unknown
Status: NEW
Severity: normal
Priority: P2
Component: tdep
Assignee: pierre.langlois at embecosm dot com
Reporter: pierre.langlois at embecosm dot com
CC: jeremy.bennett at embecosm dot com
Created attachment 7475
--> https://sourceware.org/bugzilla/attachment.cgi?id=7475&action=edit
Test program
This is due to the nature of the program counter on AVR, which is 2 bytes
addressed.
(gdb) break *(@code void *) 0x218
Breakpoint 2 at 0x430
or
(gdb) x *(@code void *) 0x218
0x430 <__mulsf3x>: 0xf3a0dfc6
The following GDB session comes from using AVaRice with real hardware
(ATxmega256a3bu).
-----------------------------------------------------------------------------
GNU gdb (AVR 8-bit toolchain (built 20140310)) 7.7.50.20140317-cvs
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "--host=x86_64-unknown-linux-gnu --target=avr".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.atmel.com>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word".
(gdb) file atxmega-test.elf
Reading symbols from atxmega-test.elf...done.
(gdb) target remote :4242
Remote debugging using :4242
0x00000000 in __vectors ()
(gdb) load
Loading section .text, size 0x532 lma 0x0
Start address 0x0, load size 1330
Transfer rate: 2 KB/sec, 47 bytes/write.
(gdb) b main
Breakpoint 1 at 0x212: file main.c, line 7.
(gdb) c
Continuing.
Note: automatically using hardware breakpoints for read-only addresses.
Breakpoint 1, main () at main.c:7
7 PORTR.DIRSET = 3;
(gdb) break *(@code void *) 0x218
Breakpoint 2 at 0x430
(gdb) break *(@code void *) 0x10a
Breakpoint 3 at 0x214: file main.c, line 7.
(gdb) q
A debugging session is active.
Inferior 1 [Remote target] will be killed.
Quit anyway? (y or n)
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