]> git.sur5r.net Git - openocd/commit
cortex_a: fix handling of Thumb-2 32bit breakpoints
authorMatthias Welwarsky <matthias.welwarsky@sysgo.com>
Thu, 5 Oct 2017 12:50:16 +0000 (14:50 +0200)
committerMatthias Welwarsky <matthias@welwarsky.de>
Wed, 21 Feb 2018 08:20:28 +0000 (08:20 +0000)
commitb551c62a7ff4e97a947486904f09a2356f27ced5
treecbf360e80ed0c241acdde6929bc883eaa7f376c0
parentdd60dd84f28deb9dd485384466c4417b527ac3b2
cortex_a: fix handling of Thumb-2 32bit breakpoints

When debugging Thumb-2 code, Gdb will at times send a
breakpoint packet 'Z0,<addr>,3', the number 3 denoting that
the instruction to break on is 32 bits long. Handle this by
replacing it with two consecutive 16bit Thumb BKPTs and make
sure to save and restore the full, original 32bit
instruction.

Note that this fix is only applicable if you debug a bare-metal program
(like the linux kernel) with the 'wrong' gdb, e.g. use an
"arm-linux" gdb instead of an "arm-eabi" gdb. But since most people
may not know about the subtle differences between gdb configurations
regarding thumb2 breakpoints it's still valid.

Change-Id: Ib93025faf35b11f0dba747a8c1fc36fd09a4c0f8
Signed-off-by: Matthias Welwarsky <matthias.welwarsky@sysgo.com>
Reviewed-on: http://openocd.zylin.com/4241
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>
Tested-by: jenkins
src/target/cortex_a.c