| /* |
| * Copyright (c) 2017-2025 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| * |
| */ |
| |
| #ifndef CONFIG_X86_64 |
| /* Save SSP restore on current shadow stack. It takes care of aligning the |
| * shadow stack token to 8 bytes boundary. First scratch will contain current |
| * SSP after the macro finishes. |
| * r0 - scratch register |
| * r1 - scratch register |
| */ |
| .macro save_ssp_restore_token r0, r1 |
| |
| rdsspd \r0 |
| movl \r0, \r1 |
| subl $8, \r0 |
| andl $~0x7, \r0 |
| wrssd \r1, (\r0) |
| xorl \r1, \r1 |
| wrssd \r1, 4(\r0) |
| |
| .endm |
| |
| /* Discard previous SSP token created by rstorssp. It takes care of aligning |
| * the SSP in case there was a hole in the shadow stack. Needs to be |
| * called right after rstorssp so it can use the flags set by rstorssp. |
| * r0 - scratch register |
| */ |
| .macro discard_previous_ssp_token r0 |
| movl $2, \r0 |
| jnc 1f |
| incl \r0 |
| 1: |
| incsspd \r0 |
| .endm |
| |
| #endif /* CONFIG_X86_64 */ |
