From 13485ab55bc77f02024e80bcca0374950b0becb3 Mon Sep 17 00:00:00 2001 From: Alexander van Heukelum Date: Wed, 2 Jul 2008 01:32:04 +0200 Subject: [PATCH] x86: traps_xx: restructure do_general_protection() - if (cond) block -> if (!cond) goto end_of_block - local caching of current Signed-off-by: Alexander van Heukelum Acked-by: Cyrill Gorcunov Signed-off-by: Ingo Molnar --- arch/x86/kernel/traps_32.c | 36 ++++++++++++++++++--------------- arch/x86/kernel/traps_64.c | 41 ++++++++++++++++++++------------------ 2 files changed, 42 insertions(+), 35 deletions(-) diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c index 5afd94a01b..c9a0120e51 100644 --- a/arch/x86/kernel/traps_32.c +++ b/arch/x86/kernel/traps_32.c @@ -598,8 +598,10 @@ DO_ERROR(12, SIGBUS, "stack segment", stack_segment) DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0, 0) DO_ERROR_INFO(32, SIGILL, "iret exception", iret_error, ILL_BADSTK, 0, 1) -void __kprobes do_general_protection(struct pt_regs *regs, long error_code) +void __kprobes +do_general_protection(struct pt_regs *regs, long error_code) { + struct task_struct *tsk; struct thread_struct *thread; struct tss_struct *tss; int cpu; @@ -640,23 +642,24 @@ void __kprobes do_general_protection(struct pt_regs *regs, long error_code) if (regs->flags & X86_VM_MASK) goto gp_in_vm86; + tsk = current; if (!user_mode(regs)) goto gp_in_kernel; - current->thread.error_code = error_code; - current->thread.trap_no = 13; + tsk->thread.error_code = error_code; + tsk->thread.trap_no = 13; - if (show_unhandled_signals && unhandled_signal(current, SIGSEGV) && - printk_ratelimit()) { + if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && + printk_ratelimit()) { printk(KERN_INFO - "%s[%d] general protection ip:%lx sp:%lx error:%lx", - current->comm, task_pid_nr(current), - regs->ip, regs->sp, error_code); + "%s[%d] general protection ip:%lx sp:%lx error:%lx", + tsk->comm, task_pid_nr(tsk), + regs->ip, regs->sp, error_code); print_vma_addr(" in ", regs->ip); printk("\n"); } - force_sig(SIGSEGV, current); + force_sig(SIGSEGV, tsk); return; gp_in_vm86: @@ -665,14 +668,15 @@ gp_in_vm86: return; gp_in_kernel: - if (!fixup_exception(regs)) { - current->thread.error_code = error_code; - current->thread.trap_no = 13; - if (notify_die(DIE_GPF, "general protection fault", regs, + 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); - } + return; + die("general protection fault", regs, error_code); } static notrace __kprobes void diff --git a/arch/x86/kernel/traps_64.c b/arch/x86/kernel/traps_64.c index 1c2d533fe7..bc21ddc97a 100644 --- a/arch/x86/kernel/traps_64.c +++ b/arch/x86/kernel/traps_64.c @@ -733,31 +733,34 @@ asmlinkage void do_double_fault(struct pt_regs * regs, long error_code) die(str, regs, error_code); } -asmlinkage void __kprobes do_general_protection(struct pt_regs * regs, - long error_code) +asmlinkage void __kprobes +do_general_protection(struct pt_regs *regs, long error_code) { - struct task_struct *tsk = current; + struct task_struct *tsk; conditional_sti(regs); - if (user_mode(regs)) { - tsk->thread.error_code = error_code; - tsk->thread.trap_no = 13; - - if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && - printk_ratelimit()) { - printk(KERN_INFO - "%s[%d] general protection ip:%lx sp:%lx error:%lx", - tsk->comm, tsk->pid, - regs->ip, regs->sp, error_code); - print_vma_addr(" in ", regs->ip); - printk("\n"); - } + tsk = current; + if (!user_mode(regs)) + goto gp_in_kernel; - force_sig(SIGSEGV, tsk); - return; - } + tsk->thread.error_code = error_code; + tsk->thread.trap_no = 13; + + if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && + printk_ratelimit()) { + printk(KERN_INFO + "%s[%d] general protection ip:%lx sp:%lx error:%lx", + tsk->comm, tsk->pid, + regs->ip, regs->sp, error_code); + print_vma_addr(" in ", regs->ip); + printk("\n"); + } + + force_sig(SIGSEGV, tsk); + return; +gp_in_kernel: if (fixup_exception(regs)) return; -- 2.39.5