projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 0df50560 HW |
1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 3 | ; Copyright (c) 2018, Intel Corporation. All rights reserved.<BR>\r | |
| 0acd8697 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| 0df50560 HW |
5 | ;\r |
| 6 | ; Abstract:\r | |
| 7 | ;\r | |
| ada4a003 HW |
8 | ; This file provides macro definitions for stuffing the Return Stack Buffer (RSB)\r |
| 9 | ; for NASM files.\r | |
| 0df50560 HW |
10 | ;\r |
| 11 | ;------------------------------------------------------------------------------\r | |
| 12 | \r | |
| 13 | %define RSB_STUFF_ENTRIES 0x20\r | |
| 14 | \r | |
| 15 | ;\r | |
| 16 | ; parameters:\r | |
| 17 | ; @param 1: register to use as counter (e.g. IA32:eax, X64:rax)\r | |
| 18 | ; @param 2: stack pointer to restore (IA32:esp, X64:rsp)\r | |
| 19 | ; @param 3: the size of a stack frame (IA32:4, X64:8)\r | |
| 20 | ;\r | |
| 21 | %macro StuffRsb 3\r | |
| 22 | mov %1, RSB_STUFF_ENTRIES / 2\r | |
| 23 | %%Unroll1:\r | |
| 24 | call %%Unroll2\r | |
| 25 | %%SpecTrap1:\r | |
| 26 | pause\r | |
| 27 | lfence\r | |
| 28 | jmp %%SpecTrap1\r | |
| 29 | %%Unroll2:\r | |
| 30 | call %%StuffLoop\r | |
| 31 | %%SpecTrap2:\r | |
| 32 | pause\r | |
| 33 | lfence\r | |
| 34 | jmp %%SpecTrap2\r | |
| 35 | %%StuffLoop:\r | |
| 36 | dec %1\r | |
| 37 | jnz %%Unroll1\r | |
| 38 | add %2, RSB_STUFF_ENTRIES * %3 ; Restore the stack pointer\r | |
| 39 | %endmacro\r | |
| 40 | \r | |
| 41 | ;\r | |
| 42 | ; RSB stuffing macros for IA32 and X64\r | |
| 43 | ;\r | |
| 44 | %macro StuffRsb32 0\r | |
| 45 | StuffRsb eax, esp, 4\r | |
| 46 | %endmacro\r | |
| 47 | \r | |
| 48 | %macro StuffRsb64 0\r | |
| 49 | StuffRsb rax, rsp, 8\r | |
| 50 | %endmacro\r |