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>
diff --git a/arch/x86/kernel/traps_32.c b/arch/x86/kernel/traps_32.c
index 0767398..ffb131f 100644
--- a/arch/x86/kernel/traps_32.c
+++ b/arch/x86/kernel/traps_32.c
@@ -48,7 +48,6 @@
#include <asm/stacktrace.h>
#include <asm/processor.h>
-#include <asm/kmemcheck.h>
#include <asm/debugreg.h>
#include <asm/atomic.h>
#include <asm/system.h>
@@ -59,6 +58,11 @@
#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>
@@ -83,6 +87,7 @@
*/
gate_desc idt_table[256]
__attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, };
+#endif
static int ignore_nmis;
@@ -106,6 +111,7 @@
dec_preempt_count();
}
+#ifdef CONFIG_X86_32
static inline void
die_if_kernel(const char *str, struct pt_regs *regs, long err)
{
@@ -153,6 +159,7 @@
return 0;
}
+#endif
static void __kprobes
do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
@@ -160,6 +167,7 @@
{
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.
@@ -169,11 +177,14 @@
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
@@ -186,6 +197,18 @@
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
+ "%s[%d] trap %s ip:%lx sp:%lx error:%lx",
+ tsk->comm, tsk->pid, str,
+ regs->ip, regs->sp, error_code);
+ print_vma_addr(" in ", regs->ip);
+ printk("\n");
+ }
+#endif
+
if (info)
force_sig_info(signr, info, tsk);
else
@@ -200,11 +223,13 @@
}
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) \
@@ -239,9 +264,41 @@
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)
+{
+ if (notify_die(DIE_TRAP, "stack segment", regs, error_code,
+ 12, SIGBUS) == NOTIFY_STOP)
+ return;
+ preempt_conditional_sti(regs);
+ do_trap(12, SIGBUS, "stack segment", regs, error_code, NULL);
+ preempt_conditional_cli(regs);
+}
+
+dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code)
+{
+ static const char str[] = "double fault";
+ struct task_struct *tsk = current;
+
+ /* Return not checked because double check cannot be ignored */
+ notify_die(DIE_TRAP, str, regs, error_code, 8, SIGSEGV);
+
+ tsk->thread.error_code = error_code;
+ tsk->thread.trap_no = 8;
+
+ /* This is always a kernel trap and never fixable (and thus must
+ never return). */
+ for (;;)
+ die(str, regs, error_code);
+}
+#endif
+
dotraplinkage void __kprobes
do_general_protection(struct pt_regs *regs, long error_code)
{
@@ -249,6 +306,7 @@
conditional_sti(regs);
+#ifdef CONFIG_X86_32
if (lazy_iobitmap_copy()) {
/* restart the faulting instruction */
return;
@@ -256,6 +314,7 @@
if (regs->flags & X86_VM_MASK)
goto gp_in_vm86;
+#endif
tsk = current;
if (!user_mode(regs))
@@ -277,10 +336,12 @@
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))
@@ -368,6 +429,7 @@
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)
@@ -402,6 +464,7 @@
do_exit(SIGSEGV);
}
+#endif
static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
{
@@ -441,11 +504,13 @@
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
@@ -453,7 +518,11 @@
{
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);
@@ -491,6 +560,29 @@
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 */
+asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs)
+{
+ struct pt_regs *regs = eregs;
+ /* Did already sync */
+ if (eregs == (struct pt_regs *)eregs->sp)
+ ;
+ /* Exception from user space */
+ else if (user_mode(eregs))
+ regs = task_pt_regs(current);
+ /* Exception from kernel and interrupts are enabled. Move to
+ kernel process stack. */
+ else if (eregs->flags & X86_EFLAGS_IF)
+ regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs));
+ if (eregs != regs)
+ *regs = *eregs;
+ return regs;
+}
+#endif
+
/*
* Our handling of the processor debug registers is non-trivial.
* We do not clear them on entry and exit from the kernel. Therefore
@@ -542,8 +634,10 @@
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;
@@ -570,10 +664,12 @@
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);
@@ -582,6 +678,20 @@
return;
}
+#ifdef CONFIG_X86_64
+static int kernel_math_error(struct pt_regs *regs, const char *str, int trapnr)
+{
+ 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;
+ die(str, regs, 0);
+ return 0;
+}
+#endif
+
/*
* Note that we play around with the 'TS' bit in an attempt to get
* the correct behaviour even in the presence of the asynchronous
@@ -618,7 +728,9 @@
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 */
@@ -649,7 +761,15 @@
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);
}
@@ -706,6 +826,7 @@
{
conditional_sti(regs);
+#ifdef CONFIG_X86_32
if (cpu_has_xmm) {
/* Handle SIMD FPU exceptions on PIII+ processors. */
ignore_fpu_irq = 1;
@@ -724,6 +845,12 @@
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
@@ -736,6 +863,7 @@
#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());
@@ -754,6 +882,15 @@
return new_kesp;
}
+#else
+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
@@ -786,14 +923,24 @@
}
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.
+ */
+ if (unlikely(restore_fpu_checking(tsk))) {
+ stts();
+ 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
@@ -802,12 +949,12 @@
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);
@@ -815,8 +962,12 @@
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)
{
@@ -839,10 +990,13 @@
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);
@@ -862,7 +1016,11 @@
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);
@@ -877,6 +1035,11 @@
#endif
set_intr_gate(19, &simd_coprocessor_error);
+#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 @@
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
}