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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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traps: x86: make traps_32.c and traps_64.c equal
Use CONFIG_X86_64/CONFIG_X86_32 to condtionally compile the parts needed for x86_64 or i386 only. Runs a small userspace for a number of minimal configurations and boots the defconfigs. Signed-off-by: Alexander van Heukelum <heukelum@fastmail.fm> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Alexander van Heukelum
Ingo Molnar
parent
c1d518c842
commit
081f75bbdc
2 changed files with 536 additions and 5 deletions
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@ -48,7 +48,6 @@
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#include <asm/stacktrace.h>
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#include <asm/processor.h>
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#include <asm/kmemcheck.h>
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#include <asm/debugreg.h>
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#include <asm/atomic.h>
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#include <asm/system.h>
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@ -59,6 +58,11 @@
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#include <mach_traps.h>
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#ifdef CONFIG_X86_64
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#include <asm/pgalloc.h>
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#include <asm/proto.h>
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#include <asm/pda.h>
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#else
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#include <asm/processor-flags.h>
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#include <asm/arch_hooks.h>
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#include <asm/nmi.h>
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@ -83,6 +87,7 @@ char ignore_fpu_irq;
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*/
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gate_desc idt_table[256]
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__attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, };
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#endif
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static int ignore_nmis;
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@ -106,6 +111,7 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
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dec_preempt_count();
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}
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#ifdef CONFIG_X86_32
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static inline void
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die_if_kernel(const char *str, struct pt_regs *regs, long err)
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{
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@ -153,6 +159,7 @@ static int lazy_iobitmap_copy(void)
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return 0;
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}
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#endif
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static void __kprobes
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do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
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@ -160,6 +167,7 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
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{
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struct task_struct *tsk = current;
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#ifdef CONFIG_X86_32
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if (regs->flags & X86_VM_MASK) {
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/*
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* traps 0, 1, 3, 4, and 5 should be forwarded to vm86.
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@ -169,11 +177,14 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
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goto vm86_trap;
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goto trap_signal;
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}
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#endif
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if (!user_mode(regs))
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goto kernel_trap;
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#ifdef CONFIG_X86_32
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trap_signal:
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#endif
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/*
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* We want error_code and trap_no set for userspace faults and
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* kernelspace faults which result in die(), but not
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@ -186,6 +197,18 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
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tsk->thread.error_code = error_code;
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tsk->thread.trap_no = trapnr;
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#ifdef CONFIG_X86_64
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if (show_unhandled_signals && unhandled_signal(tsk, signr) &&
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printk_ratelimit()) {
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printk(KERN_INFO
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"%s[%d] trap %s ip:%lx sp:%lx error:%lx",
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tsk->comm, tsk->pid, str,
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regs->ip, regs->sp, error_code);
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print_vma_addr(" in ", regs->ip);
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printk("\n");
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}
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#endif
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if (info)
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force_sig_info(signr, info, tsk);
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else
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@ -200,11 +223,13 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
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}
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return;
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#ifdef CONFIG_X86_32
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vm86_trap:
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if (handle_vm86_trap((struct kernel_vm86_regs *) regs,
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error_code, trapnr))
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goto trap_signal;
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return;
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#endif
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}
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#define DO_ERROR(trapnr, signr, str, name) \
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@ -239,9 +264,41 @@ DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip)
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DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
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DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
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DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
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#ifdef CONFIG_X86_32
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DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
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#endif
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DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
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#ifdef CONFIG_X86_64
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/* Runs on IST stack */
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dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code)
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{
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if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
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12, SIGBUS) == NOTIFY_STOP)
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return;
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preempt_conditional_sti(regs);
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do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL);
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preempt_conditional_cli(regs);
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}
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dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code)
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{
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static const char str[] = "double fault";
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struct task_struct *tsk = current;
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/* Return not checked because double check cannot be ignored */
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notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV);
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tsk->thread.error_code = error_code;
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tsk->thread.trap_no = 8;
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/* This is always a kernel trap and never fixable (and thus must
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never return). */
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for (;;)
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die(str, regs, error_code);
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}
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#endif
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dotraplinkage void __kprobes
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do_general_protection(struct pt_regs *regs, long error_code)
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{
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@ -249,6 +306,7 @@ do_general_protection(struct pt_regs *regs, long error_code)
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conditional_sti(regs);
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#ifdef CONFIG_X86_32
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if (lazy_iobitmap_copy()) {
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/* restart the faulting instruction */
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return;
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@ -256,6 +314,7 @@ do_general_protection(struct pt_regs *regs, long error_code)
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if (regs->flags & X86_VM_MASK)
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goto gp_in_vm86;
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#endif
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tsk = current;
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if (!user_mode(regs))
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@ -277,10 +336,12 @@ do_general_protection(struct pt_regs *regs, long error_code)
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force_sig(SIGSEGV, tsk);
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return;
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#ifdef CONFIG_X86_32
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gp_in_vm86:
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local_irq_enable();
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handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code);
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return;
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#endif
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gp_in_kernel:
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if (fixup_exception(regs))
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@ -368,6 +429,7 @@ unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
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printk(KERN_EMERG "Dazed and confused, but trying to continue\n");
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}
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#ifdef CONFIG_X86_32
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static DEFINE_SPINLOCK(nmi_print_lock);
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void notrace __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
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@ -402,6 +464,7 @@ void notrace __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
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do_exit(SIGSEGV);
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}
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#endif
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static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
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{
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@ -441,11 +504,13 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
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mem_parity_error(reason, regs);
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if (reason & 0x40)
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io_check_error(reason, regs);
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#ifdef CONFIG_X86_32
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/*
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* Reassert NMI in case it became active meanwhile
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* as it's edge-triggered:
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*/
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reassert_nmi();
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#endif
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}
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dotraplinkage notrace __kprobes void
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@ -453,7 +518,11 @@ do_nmi(struct pt_regs *regs, long error_code)
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{
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nmi_enter();
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#ifdef CONFIG_X86_32
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{ int cpu; cpu = smp_processor_id(); ++nmi_count(cpu); }
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#else
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add_pda(__nmi_count, 1);
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#endif
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if (!ignore_nmis)
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default_do_nmi(regs);
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@ -491,6 +560,29 @@ dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code)
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preempt_conditional_cli(regs);
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}
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#ifdef CONFIG_X86_64
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/* Help handler running on IST stack to switch back to user stack
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for scheduling or signal handling. The actual stack switch is done in
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entry.S */
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asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
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{
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struct pt_regs *regs = eregs;
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/* Did already sync */
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if (eregs == (struct pt_regs *)eregs->sp)
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;
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/* Exception from user space */
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else if (user_mode(eregs))
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regs = task_pt_regs(current);
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/* Exception from kernel and interrupts are enabled. Move to
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kernel process stack. */
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else if (eregs->flags & X86_EFLAGS_IF)
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regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs));
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if (eregs != regs)
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*regs = *eregs;
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return regs;
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}
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#endif
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/*
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* Our handling of the processor debug registers is non-trivial.
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* We do not clear them on entry and exit from the kernel. Therefore
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@ -542,8 +634,10 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
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goto clear_dr7;
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}
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#ifdef CONFIG_X86_32
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if (regs->flags & X86_VM_MASK)
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goto debug_vm86;
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#endif
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/* Save debug status register where ptrace can see it */
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tsk->thread.debugreg6 = condition;
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@ -570,10 +664,12 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
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preempt_conditional_cli(regs);
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return;
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#ifdef CONFIG_X86_32
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debug_vm86:
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handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, 1);
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preempt_conditional_cli(regs);
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return;
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#endif
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clear_TF_reenable:
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set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
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@ -582,6 +678,20 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
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return;
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}
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#ifdef CONFIG_X86_64
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static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
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{
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if (fixup_exception(regs))
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return 1;
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notify_die(DIE_GPF, str, regs, 0, trapnr, SIGFPE);
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/* Illegal floating point operation in the kernel */
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current->thread.trap_no = trapnr;
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die(str, regs, 0);
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return 0;
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}
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#endif
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/*
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* Note that we play around with the 'TS' bit in an attempt to get
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* the correct behaviour even in the presence of the asynchronous
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@ -618,7 +728,9 @@ void math_error(void __user *ip)
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swd = get_fpu_swd(task);
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switch (swd & ~cwd & 0x3f) {
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case 0x000: /* No unmasked exception */
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#ifdef CONFIG_X86_32
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return;
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#endif
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default: /* Multiple exceptions */
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break;
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case 0x001: /* Invalid Op */
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@ -649,7 +761,15 @@ void math_error(void __user *ip)
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dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code)
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{
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conditional_sti(regs);
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#ifdef CONFIG_X86_32
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ignore_fpu_irq = 1;
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#else
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if (!user_mode(regs) &&
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kernel_math_error(regs, "kernel x87 math error", 16))
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return;
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#endif
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math_error((void __user *)regs->ip);
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}
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@ -706,6 +826,7 @@ do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
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{
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conditional_sti(regs);
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#ifdef CONFIG_X86_32
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if (cpu_has_xmm) {
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/* Handle SIMD FPU exceptions on PIII+ processors. */
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ignore_fpu_irq = 1;
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@ -724,6 +845,12 @@ do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
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current->thread.error_code = error_code;
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die_if_kernel("cache flush denied", regs, error_code);
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force_sig(SIGSEGV, current);
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#else
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if (!user_mode(regs) &&
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kernel_math_error(regs, "kernel simd math error", 19))
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return;
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simd_math_error((void __user *)regs->ip);
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#endif
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}
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dotraplinkage void
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@ -736,6 +863,7 @@ do_spurious_interrupt_bug(struct pt_regs *regs, long error_code)
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#endif
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}
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#ifdef CONFIG_X86_32
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unsigned long patch_espfix_desc(unsigned long uesp, unsigned long kesp)
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{
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struct desc_struct *gdt = get_cpu_gdt_table(smp_processor_id());
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@ -754,6 +882,15 @@ unsigned long patch_espfix_desc(unsigned long uesp, unsigned long kesp)
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return new_kesp;
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}
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#else
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asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
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{
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}
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asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
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{
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}
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#endif
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/*
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* 'math_state_restore()' saves the current math information in the
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@ -786,14 +923,24 @@ asmlinkage void math_state_restore(void)
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}
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clts(); /* Allow maths ops (or we recurse) */
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#ifdef CONFIG_X86_32
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restore_fpu(tsk);
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#else
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/*
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* Paranoid restore. send a SIGSEGV if we fail to restore the state.
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*/
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if (unlikely(restore_fpu_checking(tsk))) {
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stts();
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force_sig(SIGSEGV, tsk);
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return;
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}
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#endif
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thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */
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tsk->fpu_counter++;
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}
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EXPORT_SYMBOL_GPL(math_state_restore);
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#ifndef CONFIG_MATH_EMULATION
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asmlinkage void math_emulate(long arg)
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{
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printk(KERN_EMERG
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@ -802,12 +949,12 @@ asmlinkage void math_emulate(long arg)
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force_sig(SIGFPE, current);
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schedule();
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}
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#endif /* CONFIG_MATH_EMULATION */
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dotraplinkage void __kprobes
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do_device_not_available(struct pt_regs *regs, long error)
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{
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#ifdef CONFIG_X86_32
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if (read_cr0() & X86_CR0_EM) {
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conditional_sti(regs);
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math_emulate(0);
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@ -815,8 +962,12 @@ do_device_not_available(struct pt_regs *regs, long error)
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math_state_restore(); /* interrupts still off */
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conditional_sti(regs);
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}
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#else
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math_state_restore();
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#endif
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}
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#ifdef CONFIG_X86_32
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#ifdef CONFIG_X86_MCE
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dotraplinkage void __kprobes do_machine_check(struct pt_regs *regs, long error)
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{
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@ -839,10 +990,13 @@ dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
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return;
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do_trap(32, SIGILL, "iret exception", regs, error_code, &info);
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}
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#endif
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void __init trap_init(void)
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{
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#ifdef CONFIG_X86_32
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int i;
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#endif
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#ifdef CONFIG_EISA
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void __iomem *p = early_ioremap(0x0FFFD9, 4);
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@ -862,7 +1016,11 @@ void __init trap_init(void)
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set_intr_gate(5, &bounds);
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set_intr_gate(6, &invalid_op);
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set_intr_gate(7, &device_not_available);
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#ifdef CONFIG_X86_32
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set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS);
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#else
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set_intr_gate_ist(8, &double_fault, DOUBLEFAULT_STACK);
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#endif
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set_intr_gate(9, &coprocessor_segment_overrun);
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set_intr_gate(10, &invalid_TSS);
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set_intr_gate(11, &segment_not_present);
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@ -877,6 +1035,11 @@ void __init trap_init(void)
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#endif
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set_intr_gate(19, &simd_coprocessor_error);
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|
||||
#ifdef CONFIG_IA32_EMULATION
|
||||
set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
if (cpu_has_fxsr) {
|
||||
printk(KERN_INFO "Enabling fast FPU save and restore... ");
|
||||
set_in_cr4(X86_CR4_OSFXSR);
|
||||
|
|
@ -896,11 +1059,13 @@ void __init trap_init(void)
|
|||
set_bit(i, used_vectors);
|
||||
|
||||
set_bit(SYSCALL_VECTOR, used_vectors);
|
||||
|
||||
#endif
|
||||
/*
|
||||
* Should be a barrier for any external CPU state:
|
||||
*/
|
||||
cpu_init();
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
trap_init_hook();
|
||||
#endif
|
||||
}
|
||||
|
|
|
|||
|
|
@ -33,13 +33,21 @@
|
|||
#include <linux/smp.h>
|
||||
#include <linux/io.h>
|
||||
|
||||
#ifdef CONFIG_EISA
|
||||
#include <linux/ioport.h>
|
||||
#include <linux/eisa.h>
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_MCA
|
||||
#include <linux/mca.h>
|
||||
#endif
|
||||
|
||||
#if defined(CONFIG_EDAC)
|
||||
#include <linux/edac.h>
|
||||
#endif
|
||||
|
||||
#include <asm/stacktrace.h>
|
||||
#include <asm/processor.h>
|
||||
#include <asm/kmemcheck.h>
|
||||
#include <asm/debugreg.h>
|
||||
#include <asm/atomic.h>
|
||||
#include <asm/system.h>
|
||||
|
|
@ -50,10 +58,35 @@
|
|||
|
||||
#include <mach_traps.h>
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
#include <asm/pgalloc.h>
|
||||
#include <asm/proto.h>
|
||||
#include <asm/pda.h>
|
||||
#else
|
||||
#include <asm/processor-flags.h>
|
||||
#include <asm/arch_hooks.h>
|
||||
#include <asm/nmi.h>
|
||||
#include <asm/smp.h>
|
||||
#include <asm/io.h>
|
||||
|
||||
#include "cpu/mcheck/mce.h"
|
||||
|
||||
DECLARE_BITMAP(used_vectors, NR_VECTORS);
|
||||
EXPORT_SYMBOL_GPL(used_vectors);
|
||||
|
||||
asmlinkage int system_call(void);
|
||||
|
||||
/* Do we ignore FPU interrupts ? */
|
||||
char ignore_fpu_irq;
|
||||
|
||||
/*
|
||||
* The IDT has to be page-aligned to simplify the Pentium
|
||||
* F0 0F bug workaround.. We have a special link segment
|
||||
* for this.
|
||||
*/
|
||||
gate_desc idt_table[256]
|
||||
__attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, };
|
||||
#endif
|
||||
|
||||
static int ignore_nmis;
|
||||
|
||||
|
|
@ -77,15 +110,80 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
|
|||
dec_preempt_count();
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
static inline void
|
||||
die_if_kernel(const char *str, struct pt_regs *regs, long err)
|
||||
{
|
||||
if (!user_mode_vm(regs))
|
||||
die(str, regs, err);
|
||||
}
|
||||
|
||||
/*
|
||||
* Perform the lazy TSS's I/O bitmap copy. If the TSS has an
|
||||
* invalid offset set (the LAZY one) and the faulting thread has
|
||||
* a valid I/O bitmap pointer, we copy the I/O bitmap in the TSS,
|
||||
* we set the offset field correctly and return 1.
|
||||
*/
|
||||
static int lazy_iobitmap_copy(void)
|
||||
{
|
||||
struct thread_struct *thread;
|
||||
struct tss_struct *tss;
|
||||
int cpu;
|
||||
|
||||
cpu = get_cpu();
|
||||
tss = &per_cpu(init_tss, cpu);
|
||||
thread = ¤t->thread;
|
||||
|
||||
if (tss->x86_tss.io_bitmap_base == INVALID_IO_BITMAP_OFFSET_LAZY &&
|
||||
thread->io_bitmap_ptr) {
|
||||
memcpy(tss->io_bitmap, thread->io_bitmap_ptr,
|
||||
thread->io_bitmap_max);
|
||||
/*
|
||||
* If the previously set map was extending to higher ports
|
||||
* than the current one, pad extra space with 0xff (no access).
|
||||
*/
|
||||
if (thread->io_bitmap_max < tss->io_bitmap_max) {
|
||||
memset((char *) tss->io_bitmap +
|
||||
thread->io_bitmap_max, 0xff,
|
||||
tss->io_bitmap_max - thread->io_bitmap_max);
|
||||
}
|
||||
tss->io_bitmap_max = thread->io_bitmap_max;
|
||||
tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET;
|
||||
tss->io_bitmap_owner = thread;
|
||||
put_cpu();
|
||||
|
||||
return 1;
|
||||
}
|
||||
put_cpu();
|
||||
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static void __kprobes
|
||||
do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
|
||||
long error_code, siginfo_t *info)
|
||||
{
|
||||
struct task_struct *tsk = current;
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
if (regs->flags & X86_VM_MASK) {
|
||||
/*
|
||||
* traps 0, 1, 3, 4, and 5 should be forwarded to vm86.
|
||||
* On nmi (interrupt 2), do_trap should not be called.
|
||||
*/
|
||||
if (trapnr < 6)
|
||||
goto vm86_trap;
|
||||
goto trap_signal;
|
||||
}
|
||||
#endif
|
||||
|
||||
if (!user_mode(regs))
|
||||
goto kernel_trap;
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
trap_signal:
|
||||
#endif
|
||||
/*
|
||||
* We want error_code and trap_no set for userspace faults and
|
||||
* kernelspace faults which result in die(), but not
|
||||
|
|
@ -98,6 +196,7 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
|
|||
tsk->thread.error_code = error_code;
|
||||
tsk->thread.trap_no = trapnr;
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
if (show_unhandled_signals && unhandled_signal(tsk, signr) &&
|
||||
printk_ratelimit()) {
|
||||
printk(KERN_INFO
|
||||
|
|
@ -107,6 +206,7 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
|
|||
print_vma_addr(" in ", regs->ip);
|
||||
printk("\n");
|
||||
}
|
||||
#endif
|
||||
|
||||
if (info)
|
||||
force_sig_info(signr, info, tsk);
|
||||
|
|
@ -121,6 +221,14 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
|
|||
die(str, regs, error_code);
|
||||
}
|
||||
return;
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
vm86_trap:
|
||||
if (handle_vm86_trap((struct kernel_vm86_regs *) regs,
|
||||
error_code, trapnr))
|
||||
goto trap_signal;
|
||||
return;
|
||||
#endif
|
||||
}
|
||||
|
||||
#define DO_ERROR(trapnr, signr, str, name) \
|
||||
|
|
@ -155,8 +263,12 @@ DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip)
|
|||
DO_ERROR(9, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun)
|
||||
DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
|
||||
DO_ERROR(11, SIGBUS, "segment not present", segment_not_present)
|
||||
#ifdef CONFIG_X86_32
|
||||
DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
|
||||
#endif
|
||||
DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
/* Runs on IST stack */
|
||||
dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code)
|
||||
{
|
||||
|
|
@ -184,6 +296,7 @@ dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code)
|
|||
for (;;)
|
||||
die(str, regs, error_code);
|
||||
}
|
||||
#endif
|
||||
|
||||
dotraplinkage void __kprobes
|
||||
do_general_protection(struct pt_regs *regs, long error_code)
|
||||
|
|
@ -192,6 +305,16 @@ do_general_protection(struct pt_regs *regs, long error_code)
|
|||
|
||||
conditional_sti(regs);
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
if (lazy_iobitmap_copy()) {
|
||||
/* restart the faulting instruction */
|
||||
return;
|
||||
}
|
||||
|
||||
if (regs->flags & X86_VM_MASK)
|
||||
goto gp_in_vm86;
|
||||
#endif
|
||||
|
||||
tsk = current;
|
||||
if (!user_mode(regs))
|
||||
goto gp_in_kernel;
|
||||
|
|
@ -212,6 +335,13 @@ do_general_protection(struct pt_regs *regs, long error_code)
|
|||
force_sig(SIGSEGV, tsk);
|
||||
return;
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
gp_in_vm86:
|
||||
local_irq_enable();
|
||||
handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code);
|
||||
return;
|
||||
#endif
|
||||
|
||||
gp_in_kernel:
|
||||
if (fixup_exception(regs))
|
||||
return;
|
||||
|
|
@ -277,6 +407,16 @@ unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
|
|||
if (notify_die(DIE_NMIUNKNOWN, "nmi", regs, reason, 2, SIGINT) ==
|
||||
NOTIFY_STOP)
|
||||
return;
|
||||
#ifdef CONFIG_MCA
|
||||
/*
|
||||
* Might actually be able to figure out what the guilty party
|
||||
* is:
|
||||
*/
|
||||
if (MCA_bus) {
|
||||
mca_handle_nmi();
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
printk(KERN_EMERG
|
||||
"Uhhuh. NMI received for unknown reason %02x on CPU %d.\n",
|
||||
reason, smp_processor_id());
|
||||
|
|
@ -288,6 +428,43 @@ unknown_nmi_error(unsigned char reason, struct pt_regs *regs)
|
|||
printk(KERN_EMERG "Dazed and confused, but trying to continue\n");
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
static DEFINE_SPINLOCK(nmi_print_lock);
|
||||
|
||||
void notrace __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
|
||||
{
|
||||
if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, 2, SIGINT) == NOTIFY_STOP)
|
||||
return;
|
||||
|
||||
spin_lock(&nmi_print_lock);
|
||||
/*
|
||||
* We are in trouble anyway, lets at least try
|
||||
* to get a message out:
|
||||
*/
|
||||
bust_spinlocks(1);
|
||||
printk(KERN_EMERG "%s", str);
|
||||
printk(" on CPU%d, ip %08lx, registers:\n",
|
||||
smp_processor_id(), regs->ip);
|
||||
show_registers(regs);
|
||||
if (do_panic)
|
||||
panic("Non maskable interrupt");
|
||||
console_silent();
|
||||
spin_unlock(&nmi_print_lock);
|
||||
bust_spinlocks(0);
|
||||
|
||||
/*
|
||||
* If we are in kernel we are probably nested up pretty bad
|
||||
* and might aswell get out now while we still can:
|
||||
*/
|
||||
if (!user_mode_vm(regs)) {
|
||||
current->thread.trap_no = 2;
|
||||
crash_kexec(regs);
|
||||
}
|
||||
|
||||
do_exit(SIGSEGV);
|
||||
}
|
||||
#endif
|
||||
|
||||
static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
|
||||
{
|
||||
unsigned char reason = 0;
|
||||
|
|
@ -303,6 +480,7 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
|
|||
if (notify_die(DIE_NMI_IPI, "nmi_ipi", regs, reason, 2, SIGINT)
|
||||
== NOTIFY_STOP)
|
||||
return;
|
||||
#ifdef CONFIG_X86_LOCAL_APIC
|
||||
/*
|
||||
* Ok, so this is none of the documented NMI sources,
|
||||
* so it must be the NMI watchdog.
|
||||
|
|
@ -311,6 +489,9 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
|
|||
return;
|
||||
if (!do_nmi_callback(regs, cpu))
|
||||
unknown_nmi_error(reason, regs);
|
||||
#else
|
||||
unknown_nmi_error(reason, regs);
|
||||
#endif
|
||||
|
||||
return;
|
||||
}
|
||||
|
|
@ -322,6 +503,13 @@ static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
|
|||
mem_parity_error(reason, regs);
|
||||
if (reason & 0x40)
|
||||
io_check_error(reason, regs);
|
||||
#ifdef CONFIG_X86_32
|
||||
/*
|
||||
* Reassert NMI in case it became active meanwhile
|
||||
* as it's edge-triggered:
|
||||
*/
|
||||
reassert_nmi();
|
||||
#endif
|
||||
}
|
||||
|
||||
dotraplinkage notrace __kprobes void
|
||||
|
|
@ -329,7 +517,11 @@ do_nmi(struct pt_regs *regs, long error_code)
|
|||
{
|
||||
nmi_enter();
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
{ int cpu; cpu = smp_processor_id(); ++nmi_count(cpu); }
|
||||
#else
|
||||
add_pda(__nmi_count, 1);
|
||||
#endif
|
||||
|
||||
if (!ignore_nmis)
|
||||
default_do_nmi(regs);
|
||||
|
|
@ -352,15 +544,22 @@ void restart_nmi(void)
|
|||
/* May run on IST stack. */
|
||||
dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code)
|
||||
{
|
||||
#ifdef CONFIG_KPROBES
|
||||
if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP)
|
||||
== NOTIFY_STOP)
|
||||
return;
|
||||
#else
|
||||
if (notify_die(DIE_TRAP, "int3", regs, error_code, 3, SIGTRAP)
|
||||
== NOTIFY_STOP)
|
||||
return;
|
||||
#endif
|
||||
|
||||
preempt_conditional_sti(regs);
|
||||
do_trap(3, SIGTRAP, "int3", regs, error_code, NULL);
|
||||
preempt_conditional_cli(regs);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
/* Help handler running on IST stack to switch back to user stack
|
||||
for scheduling or signal handling. The actual stack switch is done in
|
||||
entry.S */
|
||||
|
|
@ -381,6 +580,7 @@ asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
|
|||
*regs = *eregs;
|
||||
return regs;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Our handling of the processor debug registers is non-trivial.
|
||||
|
|
@ -433,6 +633,11 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
|
|||
goto clear_dr7;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
if (regs->flags & X86_VM_MASK)
|
||||
goto debug_vm86;
|
||||
#endif
|
||||
|
||||
/* Save debug status register where ptrace can see it */
|
||||
tsk->thread.debugreg6 = condition;
|
||||
|
||||
|
|
@ -458,6 +663,13 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
|
|||
preempt_conditional_cli(regs);
|
||||
return;
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
debug_vm86:
|
||||
handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, 1);
|
||||
preempt_conditional_cli(regs);
|
||||
return;
|
||||
#endif
|
||||
|
||||
clear_TF_reenable:
|
||||
set_tsk_thread_flag(tsk, TIF_SINGLESTEP);
|
||||
regs->flags &= ~X86_EFLAGS_TF;
|
||||
|
|
@ -465,6 +677,7 @@ dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code)
|
|||
return;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_64
|
||||
static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
|
||||
{
|
||||
if (fixup_exception(regs))
|
||||
|
|
@ -476,6 +689,7 @@ static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
|
|||
die(str, regs, 0);
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Note that we play around with the 'TS' bit in an attempt to get
|
||||
|
|
@ -513,6 +727,9 @@ void math_error(void __user *ip)
|
|||
swd = get_fpu_swd(task);
|
||||
switch (swd & ~cwd & 0x3f) {
|
||||
case 0x000: /* No unmasked exception */
|
||||
#ifdef CONFIG_X86_32
|
||||
return;
|
||||
#endif
|
||||
default: /* Multiple exceptions */
|
||||
break;
|
||||
case 0x001: /* Invalid Op */
|
||||
|
|
@ -543,9 +760,15 @@ void math_error(void __user *ip)
|
|||
dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code)
|
||||
{
|
||||
conditional_sti(regs);
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
ignore_fpu_irq = 1;
|
||||
#else
|
||||
if (!user_mode(regs) &&
|
||||
kernel_math_error(regs, "kernel x87 math error", 16))
|
||||
return;
|
||||
#endif
|
||||
|
||||
math_error((void __user *)regs->ip);
|
||||
}
|
||||
|
||||
|
|
@ -601,17 +824,64 @@ dotraplinkage void
|
|||
do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
|
||||
{
|
||||
conditional_sti(regs);
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
if (cpu_has_xmm) {
|
||||
/* Handle SIMD FPU exceptions on PIII+ processors. */
|
||||
ignore_fpu_irq = 1;
|
||||
simd_math_error((void __user *)regs->ip);
|
||||
return;
|
||||
}
|
||||
/*
|
||||
* Handle strange cache flush from user space exception
|
||||
* in all other cases. This is undocumented behaviour.
|
||||
*/
|
||||
if (regs->flags & X86_VM_MASK) {
|
||||
handle_vm86_fault((struct kernel_vm86_regs *)regs, error_code);
|
||||
return;
|
||||
}
|
||||
current->thread.trap_no = 19;
|
||||
current->thread.error_code = error_code;
|
||||
die_if_kernel("cache flush denied", regs, error_code);
|
||||
force_sig(SIGSEGV, current);
|
||||
#else
|
||||
if (!user_mode(regs) &&
|
||||
kernel_math_error(regs, "kernel simd math error", 19))
|
||||
return;
|
||||
simd_math_error((void __user *)regs->ip);
|
||||
#endif
|
||||
}
|
||||
|
||||
dotraplinkage void
|
||||
do_spurious_interrupt_bug(struct pt_regs *regs, long error_code)
|
||||
{
|
||||
conditional_sti(regs);
|
||||
#if 0
|
||||
/* No need to warn about this any longer. */
|
||||
printk(KERN_INFO "Ignoring P6 Local APIC Spurious Interrupt Bug...\n");
|
||||
#endif
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
unsigned long patch_espfix_desc(unsigned long uesp, unsigned long kesp)
|
||||
{
|
||||
struct desc_struct *gdt = get_cpu_gdt_table(smp_processor_id());
|
||||
unsigned long base = (kesp - uesp) & -THREAD_SIZE;
|
||||
unsigned long new_kesp = kesp - base;
|
||||
unsigned long lim_pages = (new_kesp | (THREAD_SIZE - 1)) >> PAGE_SHIFT;
|
||||
__u64 desc = *(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS];
|
||||
|
||||
/* Set up base for espfix segment */
|
||||
desc &= 0x00f0ff0000000000ULL;
|
||||
desc |= ((((__u64)base) << 16) & 0x000000ffffff0000ULL) |
|
||||
((((__u64)base) << 32) & 0xff00000000000000ULL) |
|
||||
((((__u64)lim_pages) << 32) & 0x000f000000000000ULL) |
|
||||
(lim_pages & 0xffff);
|
||||
*(__u64 *)&gdt[GDT_ENTRY_ESPFIX_SS] = desc;
|
||||
|
||||
return new_kesp;
|
||||
}
|
||||
#else
|
||||
asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
|
||||
{
|
||||
}
|
||||
|
|
@ -619,6 +889,7 @@ asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void)
|
|||
asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
|
||||
{
|
||||
}
|
||||
#endif
|
||||
|
||||
/*
|
||||
* 'math_state_restore()' saves the current math information in the
|
||||
|
|
@ -626,6 +897,9 @@ asmlinkage void __attribute__((weak)) mce_threshold_interrupt(void)
|
|||
*
|
||||
* Careful.. There are problems with IBM-designed IRQ13 behaviour.
|
||||
* Don't touch unless you *really* know how it works.
|
||||
*
|
||||
* Must be called with kernel preemption disabled (in this case,
|
||||
* local interrupts are disabled at the call-site in entry.S).
|
||||
*/
|
||||
asmlinkage void math_state_restore(void)
|
||||
{
|
||||
|
|
@ -648,6 +922,9 @@ asmlinkage void math_state_restore(void)
|
|||
}
|
||||
|
||||
clts(); /* Allow maths ops (or we recurse) */
|
||||
#ifdef CONFIG_X86_32
|
||||
restore_fpu(tsk);
|
||||
#else
|
||||
/*
|
||||
* Paranoid restore. send a SIGSEGV if we fail to restore the state.
|
||||
*/
|
||||
|
|
@ -656,19 +933,78 @@ asmlinkage void math_state_restore(void)
|
|||
force_sig(SIGSEGV, tsk);
|
||||
return;
|
||||
}
|
||||
#endif
|
||||
thread->status |= TS_USEDFPU; /* So we fnsave on switch_to() */
|
||||
tsk->fpu_counter++;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(math_state_restore);
|
||||
|
||||
#ifndef CONFIG_MATH_EMULATION
|
||||
asmlinkage void math_emulate(long arg)
|
||||
{
|
||||
printk(KERN_EMERG
|
||||
"math-emulation not enabled and no coprocessor found.\n");
|
||||
printk(KERN_EMERG "killing %s.\n", current->comm);
|
||||
force_sig(SIGFPE, current);
|
||||
schedule();
|
||||
}
|
||||
#endif /* CONFIG_MATH_EMULATION */
|
||||
|
||||
dotraplinkage void __kprobes
|
||||
do_device_not_available(struct pt_regs *regs, long error)
|
||||
{
|
||||
#ifdef CONFIG_X86_32
|
||||
if (read_cr0() & X86_CR0_EM) {
|
||||
conditional_sti(regs);
|
||||
math_emulate(0);
|
||||
} else {
|
||||
math_state_restore(); /* interrupts still off */
|
||||
conditional_sti(regs);
|
||||
}
|
||||
#else
|
||||
math_state_restore();
|
||||
#endif
|
||||
}
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
#ifdef CONFIG_X86_MCE
|
||||
dotraplinkage void __kprobes do_machine_check(struct pt_regs *regs, long error)
|
||||
{
|
||||
conditional_sti(regs);
|
||||
machine_check_vector(regs, error);
|
||||
}
|
||||
#endif
|
||||
|
||||
dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
|
||||
{
|
||||
siginfo_t info;
|
||||
local_irq_enable();
|
||||
|
||||
info.si_signo = SIGILL;
|
||||
info.si_errno = 0;
|
||||
info.si_code = ILL_BADSTK;
|
||||
info.si_addr = 0;
|
||||
if (notify_die(DIE_TRAP, "iret exception",
|
||||
regs, error_code, 32, SIGILL) == NOTIFY_STOP)
|
||||
return;
|
||||
do_trap(32, SIGILL, "iret exception", regs, error_code, &info);
|
||||
}
|
||||
#endif
|
||||
|
||||
void __init trap_init(void)
|
||||
{
|
||||
#ifdef CONFIG_X86_32
|
||||
int i;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_EISA
|
||||
void __iomem *p = early_ioremap(0x0FFFD9, 4);
|
||||
|
||||
if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24))
|
||||
EISA_bus = 1;
|
||||
early_iounmap(p, 4);
|
||||
#endif
|
||||
|
||||
set_intr_gate(0, ÷_error);
|
||||
set_intr_gate_ist(1, &debug, DEBUG_STACK);
|
||||
set_intr_gate_ist(2, &nmi, NMI_STACK);
|
||||
|
|
@ -679,7 +1015,11 @@ void __init trap_init(void)
|
|||
set_intr_gate(5, &bounds);
|
||||
set_intr_gate(6, &invalid_op);
|
||||
set_intr_gate(7, &device_not_available);
|
||||
#ifdef CONFIG_X86_32
|
||||
set_task_gate(8, GDT_ENTRY_DOUBLEFAULT_TSS);
|
||||
#else
|
||||
set_intr_gate_ist(8, &double_fault, DOUBLEFAULT_STACK);
|
||||
#endif
|
||||
set_intr_gate(9, &coprocessor_segment_overrun);
|
||||
set_intr_gate(10, &invalid_TSS);
|
||||
set_intr_gate(11, &segment_not_present);
|
||||
|
|
@ -697,8 +1037,34 @@ void __init trap_init(void)
|
|||
#ifdef CONFIG_IA32_EMULATION
|
||||
set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_syscall);
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
if (cpu_has_fxsr) {
|
||||
printk(KERN_INFO "Enabling fast FPU save and restore... ");
|
||||
set_in_cr4(X86_CR4_OSFXSR);
|
||||
printk("done.\n");
|
||||
}
|
||||
if (cpu_has_xmm) {
|
||||
printk(KERN_INFO
|
||||
"Enabling unmasked SIMD FPU exception support... ");
|
||||
set_in_cr4(X86_CR4_OSXMMEXCPT);
|
||||
printk("done.\n");
|
||||
}
|
||||
|
||||
set_system_trap_gate(SYSCALL_VECTOR, &system_call);
|
||||
|
||||
/* Reserve all the builtin and the syscall vector: */
|
||||
for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++)
|
||||
set_bit(i, used_vectors);
|
||||
|
||||
set_bit(SYSCALL_VECTOR, used_vectors);
|
||||
#endif
|
||||
/*
|
||||
* Should be a barrier for any external CPU state:
|
||||
*/
|
||||
cpu_init();
|
||||
|
||||
#ifdef CONFIG_X86_32
|
||||
trap_init_hook();
|
||||
#endif
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue