diff options
| author | Jason Wessel <[email protected]> | 2012-03-23 09:35:05 -0500 |
|---|---|---|
| committer | Jason Wessel <[email protected]> | 2012-03-29 17:41:25 -0500 |
| commit | 3751d3e85cf693e10e2c47c03c8caa65e171099b (patch) | |
| tree | 65d123dac17103f6862831bcb4271b263805fd9f /include/linux/kgdb.h | |
| parent | 98b54aa1a2241b59372468bd1e9c2d207bdba54b (diff) | |
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: [email protected]
Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: [email protected] # >= 2.6.36
Inspried-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Jason Wessel <[email protected]>
Diffstat (limited to 'include/linux/kgdb.h')
| -rw-r--r-- | include/linux/kgdb.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h index e5d689c1d774..c4d2fc194ede 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 { |