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WSL2-Linux-Kernel
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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 2008-10-03 22:00:39 +02:00 коммит произвёл Ingo Molnar
Родитель c1d518c842
Коммит 081f75bbdc
2 изменённых файлов: 536 добавлений и 5 удалений
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173
arch/x86/kernel/traps_32.c
Просмотреть файл

@ -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 @@ char ignore_fpu_irq;
*/
gate_desc idt_table[256]
__attribute__((__section__(".data.idt"))) = { { { { 0, 0 } } }, };
#endif
static int ignore_nmis;
@ -106,6 +111,7 @@ 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)
{
@ -153,6 +159,7 @@ static int lazy_iobitmap_copy(void)
return 0;
}
#endif
static void __kprobes
do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
@ -160,6 +167,7 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
{
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 @@ do_trap(int trapnr, int signr, char *str, struct pt_regs *regs,
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 @@ trap_signal:
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 @@ kernel_trap:
}
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_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)
{
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 @@ 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;
@ -256,6 +314,7 @@ do_general_protection(struct pt_regs *regs, long error_code)
if (regs->flags & X86_VM_MASK)
goto gp_in_vm86;
#endif
tsk = current;
if (!user_mode(regs))
@ -277,10 +336,12 @@ 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))
@ -368,6 +429,7 @@ 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)
@ -402,6 +464,7 @@ void notrace __kprobes die_nmi(char *str, struct pt_regs *regs, int do_panic)
do_exit(SIGSEGV);
}
#endif
static notrace __kprobes void default_do_nmi(struct pt_regs *regs)
{
@ -441,11 +504,13 @@ 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
@ -453,7 +518,11 @@ 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);
@ -491,6 +560,29 @@ dotraplinkage void __kprobes do_int3(struct pt_regs *regs, long error_code)
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 @@ 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;
@ -570,10 +664,12 @@ clear_dr7:
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 @@ clear_TF_reenable:
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 @@ 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 */
@ -649,7 +761,15 @@ 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);
}
@ -706,6 +826,7 @@ 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;
@ -724,6 +845,12 @@ do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
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 @@ do_spurious_interrupt_bug(struct pt_regs *regs, long error_code)
#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 @@ unsigned long patch_espfix_desc(unsigned long uesp, unsigned long kesp)
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 @@ 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.
*/
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 @@ asmlinkage void math_emulate(long arg)
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 @@ do_device_not_available(struct pt_regs *regs, long error)
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 @@ dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code)
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 @@ 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);
@ -877,6 +1035,11 @@ void __init trap_init(void)
#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 @@ 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
}

368
arch/x86/kernel/traps_64.c
Просмотреть файл

@ -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 = &current->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 @@ kernel_trap:
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 @@ clear_dr7:
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 @@ clear_TF_reenable:
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, &divide_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
}