1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright(c) 2016-20 Intel Corporation. 4 */ 5 6 .macro ENCLU 7 .byte 0x0f, 0x01, 0xd7 8 .endm 9 10 .section ".tcs", "aw" 11 .balign 4096 12 13 .fill 1, 8, 0 # STATE (set by CPU) 14 .fill 1, 8, 0 # FLAGS 15 .quad encl_ssa_tcs1 # OSSA 16 .fill 1, 4, 0 # CSSA (set by CPU) 17 .fill 1, 4, 1 # NSSA 18 .quad encl_entry # OENTRY 19 .fill 1, 8, 0 # AEP (set by EENTER and ERESUME) 20 .fill 1, 8, 0 # OFSBASE 21 .fill 1, 8, 0 # OGSBASE 22 .fill 1, 4, 0xFFFFFFFF # FSLIMIT 23 .fill 1, 4, 0xFFFFFFFF # GSLIMIT 24 .fill 4024, 1, 0 # Reserved 25 26 # TCS2 27 .fill 1, 8, 0 # STATE (set by CPU) 28 .fill 1, 8, 0 # FLAGS 29 .quad encl_ssa_tcs2 # OSSA 30 .fill 1, 4, 0 # CSSA (set by CPU) 31 .fill 1, 4, 1 # NSSA 32 .quad encl_entry # OENTRY 33 .fill 1, 8, 0 # AEP (set by EENTER and ERESUME) 34 .fill 1, 8, 0 # OFSBASE 35 .fill 1, 8, 0 # OGSBASE 36 .fill 1, 4, 0xFFFFFFFF # FSLIMIT 37 .fill 1, 4, 0xFFFFFFFF # GSLIMIT 38 .fill 4024, 1, 0 # Reserved 39 40 .text 41 42 encl_entry: 43 # RBX contains the base address for TCS, which is the first address 44 # inside the enclave for TCS #1 and one page into the enclave for 45 # TCS #2. By adding the value of encl_stack to it, we get 46 # the absolute address for the stack. 47 lea (encl_stack)(%rbx), %rax 48 jmp encl_entry_core 49 encl_dyn_entry: 50 # Entry point for dynamically created TCS page expected to follow 51 # its stack directly. 52 lea -1(%rbx), %rax 53 encl_entry_core: 54 xchg %rsp, %rax 55 push %rax 56 57 push %rcx # push the address after EENTER 58 push %rbx # push the enclave base address 59 60 call encl_body 61 62 pop %rbx # pop the enclave base address 63 64 /* Clear volatile GPRs, except RAX (EEXIT function). */ 65 xor %rcx, %rcx 66 xor %rdx, %rdx 67 xor %rdi, %rdi 68 xor %rsi, %rsi 69 xor %r8, %r8 70 xor %r9, %r9 71 xor %r10, %r10 72 xor %r11, %r11 73 74 # Reset status flags. 75 add %rdx, %rdx # OF = SF = AF = CF = 0; ZF = PF = 1 76 77 # Prepare EEXIT target by popping the address of the instruction after 78 # EENTER to RBX. 79 pop %rbx 80 81 # Restore the caller stack. 82 pop %rax 83 mov %rax, %rsp 84 85 # EEXIT 86 mov $4, %rax 87 enclu 88 89 .section ".data", "aw" 90 91 encl_ssa_tcs1: 92 .space 4096 93 encl_ssa_tcs2: 94 .space 4096 95 96 .balign 4096 97 # Stack of TCS #1 98 .space 4096 99 encl_stack: 100 .balign 4096 101 # Stack of TCS #2 102 .space 4096 103