projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e21d50f3 AL |
1 | /* |
| 2 | * check_initial_reg_state.c - check that execve sets the correct state | |
| 3 | * Copyright (c) 2014-2016 Andrew Lutomirski | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or modify | |
| 6 | * it under the terms and conditions of the GNU General Public License, | |
| 7 | * version 2, as published by the Free Software Foundation. | |
| 8 | * | |
| 9 | * This program is distributed in the hope it will be useful, but | |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 12 | * General Public License for more details. | |
| 13 | */ | |
| 14 | ||
| 15 | #define _GNU_SOURCE | |
| 16 | ||
| 17 | #include <stdio.h> | |
| 18 | ||
| 19 | unsigned long ax, bx, cx, dx, si, di, bp, sp, flags; | |
| 20 | unsigned long r8, r9, r10, r11, r12, r13, r14, r15; | |
| 21 | ||
| 22 | asm ( | |
| 23 | ".pushsection .text\n\t" | |
| 24 | ".type real_start, @function\n\t" | |
| 25 | ".global real_start\n\t" | |
| 26 | "real_start:\n\t" | |
| 27 | #ifdef __x86_64__ | |
| 28 | "mov %rax, ax\n\t" | |
| 29 | "mov %rbx, bx\n\t" | |
| 30 | "mov %rcx, cx\n\t" | |
| 31 | "mov %rdx, dx\n\t" | |
| 32 | "mov %rsi, si\n\t" | |
| 33 | "mov %rdi, di\n\t" | |
| 34 | "mov %rbp, bp\n\t" | |
| 35 | "mov %rsp, sp\n\t" | |
| 36 | "mov %r8, r8\n\t" | |
| 37 | "mov %r9, r9\n\t" | |
| 38 | "mov %r10, r10\n\t" | |
| 39 | "mov %r11, r11\n\t" | |
| 40 | "mov %r12, r12\n\t" | |
| 41 | "mov %r13, r13\n\t" | |
| 42 | "mov %r14, r14\n\t" | |
| 43 | "mov %r15, r15\n\t" | |
| 44 | "pushfq\n\t" | |
| 45 | "popq flags\n\t" | |
| 46 | #else | |
| 47 | "mov %eax, ax\n\t" | |
| 48 | "mov %ebx, bx\n\t" | |
| 49 | "mov %ecx, cx\n\t" | |
| 50 | "mov %edx, dx\n\t" | |
| 51 | "mov %esi, si\n\t" | |
| 52 | "mov %edi, di\n\t" | |
| 53 | "mov %ebp, bp\n\t" | |
| 54 | "mov %esp, sp\n\t" | |
| 55 | "pushfl\n\t" | |
| 56 | "popl flags\n\t" | |
| 57 | #endif | |
| 58 | "jmp _start\n\t" | |
| 59 | ".size real_start, . - real_start\n\t" | |
| 60 | ".popsection"); | |
| 61 | ||
| 62 | int main() | |
| 63 | { | |
| 64 | int nerrs = 0; | |
| 65 | ||
| 66 | if (sp == 0) { | |
| 67 | printf("[FAIL]\tTest was built incorrectly\n"); | |
| 68 | return 1; | |
| 69 | } | |
| 70 | ||
| 71 | if (ax || bx || cx || dx || si || di || bp | |
| 72 | #ifdef __x86_64__ | |
| 73 | || r8 || r9 || r10 || r11 || r12 || r13 || r14 || r15 | |
| 74 | #endif | |
| 75 | ) { | |
| 76 | printf("[FAIL]\tAll GPRs except SP should be 0\n"); | |
| 77 | #define SHOW(x) printf("\t" #x " = 0x%lx\n", x); | |
| 78 | SHOW(ax); | |
| 79 | SHOW(bx); | |
| 80 | SHOW(cx); | |
| 81 | SHOW(dx); | |
| 82 | SHOW(si); | |
| 83 | SHOW(di); | |
| 84 | SHOW(bp); | |
| 85 | SHOW(sp); | |
| 86 | #ifdef __x86_64__ | |
| 87 | SHOW(r8); | |
| 88 | SHOW(r9); | |
| 89 | SHOW(r10); | |
| 90 | SHOW(r11); | |
| 91 | SHOW(r12); | |
| 92 | SHOW(r13); | |
| 93 | SHOW(r14); | |
| 94 | SHOW(r15); | |
| 95 | #endif | |
| 96 | nerrs++; | |
| 97 | } else { | |
| 98 | printf("[OK]\tAll GPRs except SP are 0\n"); | |
| 99 | } | |
| 100 | ||
| 101 | if (flags != 0x202) { | |
| 102 | printf("[FAIL]\tFLAGS is 0x%lx, but it should be 0x202\n", flags); | |
| 103 | nerrs++; | |
| 104 | } else { | |
| 105 | printf("[OK]\tFLAGS is 0x202\n"); | |
| 106 | } | |
| 107 | ||
| 108 | return nerrs ? 1 : 0; | |
| 109 | } |