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Subject[PATCH] x86: Use fixup_exception() in traps_64.c
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Date
Use the fixup_exception() helper instead of the open-coded
search_extable() users.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
---
Ingo, this depends on my patch in x86.git unifying extable.c that
introduces fixup_exception() to X86_64.

arch/x86/kernel/traps_64.c | 47 ++++++++++++++-----------------------------
1 files changed, 15 insertions(+), 32 deletions(-)

diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c
index e3d1ca1..c173687 100644
--- a/arch/x86/kernel/traps_64.c
+++ b/arch/x86/kernel/traps_64.c
@@ -606,19 +606,12 @@ static void __kprobes do_trap(int trapnr, int signr, char *str,
}


- /* kernel trap */
- {
- const struct exception_table_entry *fixup;
- fixup = search_exception_tables(regs->ip);
- if (fixup)
- regs->ip = fixup->fixup;
- else {
- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = trapnr;
- die(str, regs, error_code);
- }
- return;
+ if (!fixup_exception(regs)) {
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = trapnr;
+ die(str, regs, error_code);
}
+ return;
}

#define DO_ERROR(trapnr, signr, str, name) \
@@ -707,22 +700,15 @@ asmlinkage void __kprobes do_general_protection(struct pt_regs * regs,
return;
}

- /* kernel gp */
- {
- const struct exception_table_entry *fixup;
- fixup = search_exception_tables(regs->ip);
- if (fixup) {
- regs->ip = fixup->fixup;
- return;
- }
+ if (fixup_exception(regs))
+ return;

- tsk->thread.error_code = error_code;
- tsk->thread.trap_no = 13;
- if (notify_die(DIE_GPF, "general protection fault", regs,
- error_code, 13, SIGSEGV) == NOTIFY_STOP)
- return;
- die("general protection fault", regs, error_code);
- }
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = 13;
+ if (notify_die(DIE_GPF, "general protection fault", regs,
+ error_code, 13, SIGSEGV) == NOTIFY_STOP)
+ return;
+ die("general protection fault", regs, error_code);
}

static __kprobes void
@@ -914,12 +900,9 @@ clear_TF_reenable:

static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
{
- const struct exception_table_entry *fixup;
- fixup = search_exception_tables(regs->ip);
- if (fixup) {
- regs->ip = fixup->fixup;
+ if (fixup_exception(regs))
return 1;
- }
+
notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE);
/* Illegal floating point operation in the kernel */
current->thread.trap_no = trapnr;
--
1.5.4.rc2.1164.g6451


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