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Now panics if page faults are forbidden and happen anyway.

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git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2142 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Axel Dörfler 2002-12-03 14:10:34 +00:00
parent 52bd3fc17c
commit 5cdaa5176e
1 changed files with 13 additions and 10 deletions
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23
src/kernel/core/arch/x86/arch_int.c
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@ -158,7 +158,9 @@ arch_int_is_interrupts_enabled(void)
}
void i386_handle_trap(struct iframe frame); /* keep the compiler happy, this function must be called only from assembly */
/* keep the compiler happy, this function must be called only from assembly */
void i386_handle_trap(struct iframe frame);
void
i386_handle_trap(struct iframe frame)
{
@ -188,8 +190,10 @@ i386_handle_trap(struct iframe frame)
// if the interrupts were disabled, and we are not running the kernel startup
// the page fault was not allowed to happen and we must panic
if (0 == (frame.flags & 0x200) && !kernel_startup) {
panic("page_fault, but interrupts were disabled. Touching address %p from eip %p\n", (void *)cr2, (void *)frame.eip);
}
panic("page fault, but interrupts were disabled. Touching address %p from eip %p\n", (void *)cr2, (void *)frame.eip);
} else if (thread != NULL && thread->page_faults_allowed < 1)
panic("page fault not allowed at this place. Touching address %p from eip %p\n", (void *)cr2, (void *)frame.eip);
enable_interrupts();
ret = vm_page_fault(cr2, frame.eip,
@ -225,12 +229,12 @@ i386_handle_trap(struct iframe frame)
** edx has pointer to buffer containing args from first to last
** each is verified to make sure someone doesn't try to clobber it
*/
if(frame.ecx <= MAX_ARGS) {
if((addr)frame.edx >= KERNEL_BASE && (addr)frame.edx <= KERNEL_TOP) {
if (frame.ecx <= MAX_ARGS) {
if ((addr)frame.edx >= KERNEL_BASE && (addr)frame.edx <= KERNEL_TOP) {
retcode = ERR_VM_BAD_USER_MEMORY;
} else {
rc = user_memcpy(args, (void *)frame.edx, frame.ecx * sizeof(unsigned int));
if(rc < 0)
if (rc < 0)
retcode = ERR_VM_BAD_USER_MEMORY;
else
ret = syscall_dispatcher(frame.eax, (void *)args, &retcode);
@ -244,7 +248,7 @@ i386_handle_trap(struct iframe frame)
break;
}
default:
if(frame.vector >= 0x20) {
if (frame.vector >= 0x20) {
interrupt_ack(frame.vector); // ack the 8239 (if applicable)
ret = int_io_interrupt_handler(frame.vector);
} else {
@ -262,10 +266,9 @@ i386_handle_trap(struct iframe frame)
restore_interrupts(state);
}
if (frame.cs == USER_CODE_SEG || frame.vector == 99) {
if (frame.cs == USER_CODE_SEG || frame.vector == 99)
thread_atkernel_exit();
}
// dprintf("0x%x cpu %d!\n", thread_get_current_thread_id(), smp_get_current_cpu());
if (thread)