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ARM: kgdb: ignore breakpoint instructions from user mode

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Avoid conflicts with user mode usage of the same instructions, as with
Clang -ftrapv.

Change-Id: I12d1c6d8f94376bfd2503cb0be843d7e478fb6ea
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Todd Poynor 2013-07-03 15:48:04 -07:00 • committed by John Stultz
parent f8b0ad9d7b
commit 699df5adbb
1 changed files with 4 additions and 0 deletions
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4
arch/arm/kernel/kgdb.c
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@ -140,6 +140,8 @@ int kgdb_arch_handle_exception(int exception_vector, int signo,
static int kgdb_brk_fn(struct pt_regs *regs, unsigned int instr) static int kgdb_brk_fn(struct pt_regs *regs, unsigned int instr)
{ {
if (user_mode(regs))
return -1;
kgdb_handle_exception(1, SIGTRAP, 0, regs); kgdb_handle_exception(1, SIGTRAP, 0, regs);
return 0; return 0;
@ -147,6 +149,8 @@ static int kgdb_brk_fn(struct pt_regs *regs, unsigned int instr)
static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int instr) static int kgdb_compiled_brk_fn(struct pt_regs *regs, unsigned int instr)
{ {
if (user_mode(regs))
return -1;
compiled_break = 1; compiled_break = 1;
kgdb_handle_exception(1, SIGTRAP, 0, regs); kgdb_handle_exception(1, SIGTRAP, 0, regs);