sdrad_exit.S

/**
 * @file sdrad_exit.S
 * @author Merve Gulmez
 * @brief 
 * @date 2022-02-07
 * 
 * @copyright © Ericsson AB 2022-2023
 * 
 * SPDX-License-Identifier: BSD 3-Clause
 */
.intel_syntax noprefix
.extern __sdrad_exit@PLT
#define __ASSEMBLY__

.section .note.GNU-stack,"",@progbits
.section .text
.global  sdrad_exit
.type    sdrad_exit, @function

/*

struct sdrad_ee_stack_t
{
    long stack_info;
    long pkru_info;
}__attribute__((packed));


*/ 
sdrad_exit:
    mov     eax, 0
    sub     rsp, 16
    mov     rdi, rsp                // __sdrad_exit() will fill that stack area  
    call    __sdrad_exit@PLT
    pop     rdi                     // stack info 
    pop     rax                     // pkru info   
    pop     rsi                     // return address of sdrad_exit() 
    mov     rcx, 0                  // update pkru with parent domain pkru config 
    mov     rdx, 0 
    wrpkru 
    mov     rsp, rdi                // update stack pointer with parent 
    push    rsi
    ret