diff options
Diffstat (limited to 'asm/usermode.s')
| -rw-r--r-- | asm/usermode.s | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/asm/usermode.s b/asm/usermode.s deleted file mode 100644 index 71ecc1d..0000000 --- a/asm/usermode.s +++ /dev/null @@ -1,38 +0,0 @@ -.global asm_usermode - -asm_usermode: - - mov 0x4(%esp),%edx //get adress of passed : void func() - //to be called in ring 3 - - // 0x23 is user data segment (|2 low bits) - // 0x1b is user code segment (|2 low bits) - - // set segment registers - mov $0x23, %ax - mov %ax, %ds - mov %ax, %es - mov %ax, %fs - mov %ax, %gs - - // ss is handled by iret - - mov %esp, %eax - - pushl $0x23 // user data segment - pushl $0x8fff000-3*32 //%eax // current stack - pushf // - - // http://x86.renejeschke.de/html/file_module_x86_id_145.html - //mov $0x200, %eax - //push %eax // eflags image - pushl $0x1B // return code segment selector - push %edx // return instruction pointer - - iret - - jmp . // never to be reached - - - - |