X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;ds=sidebyside;f=arch%2Fi386%2Fkernel%2Ftraps.c;h=d4fd1c57b09e99536aa5d9fd2d808be76cd52896;hb=f7f1b0f1e2fbadeab12d24236000e778aa9b1ead;hp=f7e15360bea6b1197dd1803d508a2b4293aabacf;hpb=e3f6fb6212a7102bdb56ba38fa1e98fe72950475;p=linux-2.6.git

diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index f7e15360b..d4fd1c57b 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -348,8 +348,7 @@ void die(const char * str, struct pt_regs * regs, long err)
 
 	if (panic_on_oops) {
 		printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
-		set_current_state(TASK_UNINTERRUPTIBLE);
-		schedule_timeout(5 * HZ);
+		ssleep(5);
 		panic("Fatal exception");
 	}
 	do_exit(SIGSEGV);
@@ -455,6 +454,7 @@ DO_ERROR(10, SIGSEGV, "invalid TSS", invalid_TSS)
 DO_ERROR(11, SIGBUS,  "segment not present", segment_not_present)
 DO_ERROR(12, SIGBUS,  "stack segment", stack_segment)
 DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
+DO_ERROR_INFO(32, SIGSEGV, "iret exception", iret_error, ILL_BADSTK, 0)
 
 fastcall void do_general_protection(struct pt_regs * regs, long error_code)
 {
@@ -646,16 +646,15 @@ void unset_nmi_callback(void)
 }
 
 #ifdef CONFIG_KPROBES
-fastcall int do_int3(struct pt_regs *regs, long error_code)
+fastcall void do_int3(struct pt_regs *regs, long error_code)
 {
 	if (notify_die(DIE_INT3, "int3", regs, error_code, 3, SIGTRAP)
 			== NOTIFY_STOP)
-		return 1;
+		return;
 	/* This is an interrupt gate, because kprobes wants interrupts
 	disabled.  Normal trap handlers don't. */
 	restore_interrupts(regs);
 	do_trap(3, SIGTRAP, "int3", 1, regs, error_code, NULL);
-	return 0;
 }
 #endif
 
@@ -710,8 +709,6 @@ fastcall void do_debug(struct pt_regs * regs, long error_code)
 	/*
 	 * Single-stepping through TF: make sure we ignore any events in
 	 * kernel space (but re-enable TF when returning to user mode).
-	 * And if the event was due to a debugger (PT_DTRACE), clear the
-	 * TF flag so that register information is correct.
 	 */
 	if (condition & DR_STEP) {
 		/*
@@ -721,11 +718,6 @@ fastcall void do_debug(struct pt_regs * regs, long error_code)
 		 */
 		if ((regs->xcs & 3) == 0)
 			goto clear_TF_reenable;
-
-		if (likely(tsk->ptrace & PT_DTRACE)) {
-			tsk->ptrace &= ~PT_DTRACE;
-			regs->eflags &= ~TF_MASK;
-		}
 	}
 
 	/* Ok, finally something we can handle */
@@ -817,7 +809,7 @@ fastcall void do_coprocessor_error(struct pt_regs * regs, long error_code)
 	math_error((void __user *)regs->eip);
 }
 
-void simd_math_error(void __user *eip)
+static void simd_math_error(void __user *eip)
 {
 	struct task_struct * task;
 	siginfo_t info;
@@ -898,6 +890,51 @@ fastcall void do_spurious_interrupt_bug(struct pt_regs * regs,
 #endif
 }
 
+fastcall void setup_x86_bogus_stack(unsigned char * stk)
+{
+	unsigned long *switch16_ptr, *switch32_ptr;
+	struct pt_regs *regs;
+	unsigned long stack_top, stack_bot;
+	unsigned short iret_frame16_off;
+	int cpu = smp_processor_id();
+	/* reserve the space on 32bit stack for the magic switch16 pointer */
+	memmove(stk, stk + 8, sizeof(struct pt_regs));
+	switch16_ptr = (unsigned long *)(stk + sizeof(struct pt_regs));
+	regs = (struct pt_regs *)stk;
+	/* now the switch32 on 16bit stack */
+	stack_bot = (unsigned long)&per_cpu(cpu_16bit_stack, cpu);
+	stack_top = stack_bot +	CPU_16BIT_STACK_SIZE;
+	switch32_ptr = (unsigned long *)(stack_top - 8);
+	iret_frame16_off = CPU_16BIT_STACK_SIZE - 8 - 20;
+	/* copy iret frame on 16bit stack */
+	memcpy((void *)(stack_bot + iret_frame16_off), &regs->eip, 20);
+	/* fill in the switch pointers */
+	switch16_ptr[0] = (regs->esp & 0xffff0000) | iret_frame16_off;
+	switch16_ptr[1] = __ESPFIX_SS;
+	switch32_ptr[0] = (unsigned long)stk + sizeof(struct pt_regs) +
+		8 - CPU_16BIT_STACK_SIZE;
+	switch32_ptr[1] = __KERNEL_DS;
+}
+
+fastcall unsigned char * fixup_x86_bogus_stack(unsigned short sp)
+{
+	unsigned long *switch32_ptr;
+	unsigned char *stack16, *stack32;
+	unsigned long stack_top, stack_bot;
+	int len;
+	int cpu = smp_processor_id();
+	stack_bot = (unsigned long)&per_cpu(cpu_16bit_stack, cpu);
+	stack_top = stack_bot +	CPU_16BIT_STACK_SIZE;
+	switch32_ptr = (unsigned long *)(stack_top - 8);
+	/* copy the data from 16bit stack to 32bit stack */
+	len = CPU_16BIT_STACK_SIZE - 8 - sp;
+	stack16 = (unsigned char *)(stack_bot + sp);
+	stack32 = (unsigned char *)
+		(switch32_ptr[0] + CPU_16BIT_STACK_SIZE - 8 - len);
+	memcpy(stack32, stack16, len);
+	return stack32;
+}
+
 /*
  *  'math_state_restore()' saves the current math information in the
  * old math state array, and gets the new ones from the current task
@@ -1041,3 +1078,10 @@ void __init trap_init(void)
 
 	trap_init_hook();
 }
+
+static int __init kstack_setup(char *s)
+{
+	kstack_depth_to_print = simple_strtoul(s, NULL, 0);
+	return 0;
+}
+__setup("kstack=", kstack_setup);