| /* |
| * Copyright 2010 Siemens AG |
| * Author: Jan Kiszka |
| * |
| * Released under GPLv2. |
| */ |
| |
| #include "libcflat.h" |
| #include "x86/desc.h" |
| |
| #define TSS_RETURN (FIRST_SPARE_SEL) |
| |
| void fault_entry(void); |
| |
| static __attribute__((used, regparm(1))) void |
| fault_handler(unsigned long error_code) |
| { |
| print_current_tss_info(); |
| printf("error code %lx\n", error_code); |
| |
| tss.eip += 2; |
| |
| gdt32[TSS_MAIN / 8].access &= ~2; |
| |
| set_gdt_task_gate(TSS_RETURN, tss_intr.prev); |
| } |
| |
| asm ( |
| "fault_entry:\n" |
| " mov (%esp),%eax\n" |
| " call fault_handler\n" |
| " jmp $" xstr(TSS_RETURN) ", $0\n" |
| ); |
| |
| int main(int ac, char **av) |
| { |
| const long invalid_segment = 0x1234; |
| |
| setup_tss32(); |
| set_intr_task_gate(13, fault_entry); |
| |
| asm ( |
| "mov %0,%%es\n" |
| : : "r" (invalid_segment) : "edi" |
| ); |
| |
| printf("post fault\n"); |
| |
| return 0; |
| } |
