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authorJason Wessel <jason.wessel@windriver.com>2012-03-23 09:35:05 -0500
committerJason Wessel <jason.wessel@windriver.com>2012-03-29 17:41:25 -0500
commit3751d3e85cf693e10e2c47c03c8caa65e171099b (patch)
tree65d123dac17103f6862831bcb4271b263805fd9f /include/linux/kgdb.h
parent98b54aa1a2241b59372468bd1e9c2d207bdba54b (diff)
downloadop-kernel-dev-3751d3e85cf693e10e2c47c03c8caa65e171099b.zip
op-kernel-dev-3751d3e85cf693e10e2c47c03c8caa65e171099b.tar.gz
x86,kgdb: Fix DEBUG_RODATA limitation using text_poke()
There has long been a limitation using software breakpoints with a kernel compiled with CONFIG_DEBUG_RODATA going back to 2.6.26. For this particular patch, it will apply cleanly and has been tested all the way back to 2.6.36. The kprobes code uses the text_poke() function which accommodates writing a breakpoint into a read-only page. The x86 kgdb code can solve the problem similarly by overriding the default breakpoint set/remove routines and using text_poke() directly. The x86 kgdb code will first attempt to use the traditional probe_kernel_write(), and next try using a the text_poke() function. The break point install method is tracked such that the correct break point removal routine will get called later on. Cc: x86@kernel.org Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: stable@vger.kernel.org # >= 2.6.36 Inspried-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Diffstat (limited to 'include/linux/kgdb.h')
-rw-r--r--include/linux/kgdb.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h
index e5d689c..c4d2fc1 100644
--- a/include/linux/kgdb.h
+++ b/include/linux/kgdb.h
@@ -63,7 +63,8 @@ enum kgdb_bptype {
BP_HARDWARE_BREAKPOINT,
BP_WRITE_WATCHPOINT,
BP_READ_WATCHPOINT,
- BP_ACCESS_WATCHPOINT
+ BP_ACCESS_WATCHPOINT,
+ BP_POKE_BREAKPOINT,
};
enum kgdb_bpstate {
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