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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-15 16:32:27 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-03-15 16:32:27 (GMT) |
commit | ba33ea811e1ff6726abb7f8f96df38c2d7b50304 (patch) | |
tree | 29134e5cc7c19c8e520cb9336b476144d3d1252f /tools/testing/selftests/x86/check_initial_reg_state.c | |
parent | e23604edac2a7be6a8808a5d13fac6b9df4eb9a8 (diff) | |
parent | d05004944206cbbf1c453e179768163731c7c6f1 (diff) | |
download | linux-ba33ea811e1ff6726abb7f8f96df38c2d7b50304.tar.xz |
Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 asm updates from Ingo Molnar:
"This is another big update. Main changes are:
- lots of x86 system call (and other traps/exceptions) entry code
enhancements. In particular the complex parts of the 64-bit entry
code have been migrated to C code as well, and a number of dusty
corners have been refreshed. (Andy Lutomirski)
- vDSO special mapping robustification and general cleanups (Andy
Lutomirski)
- cpufeature refactoring, cleanups and speedups (Borislav Petkov)
- lots of other changes ..."
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (64 commits)
x86/cpufeature: Enable new AVX-512 features
x86/entry/traps: Show unhandled signal for i386 in do_trap()
x86/entry: Call enter_from_user_mode() with IRQs off
x86/entry/32: Change INT80 to be an interrupt gate
x86/entry: Improve system call entry comments
x86/entry: Remove TIF_SINGLESTEP entry work
x86/entry/32: Add and check a stack canary for the SYSENTER stack
x86/entry/32: Simplify and fix up the SYSENTER stack #DB/NMI fixup
x86/entry: Only allocate space for tss_struct::SYSENTER_stack if needed
x86/entry: Vastly simplify SYSENTER TF (single-step) handling
x86/entry/traps: Clear DR6 early in do_debug() and improve the comment
x86/entry/traps: Clear TIF_BLOCKSTEP on all debug exceptions
x86/entry/32: Restore FLAGS on SYSEXIT
x86/entry/32: Filter NT and speed up AC filtering in SYSENTER
x86/entry/compat: In SYSENTER, sink AC clearing below the existing FLAGS test
selftests/x86: In syscall_nt, test NT|TF as well
x86/asm-offsets: Remove PARAVIRT_enabled
x86/entry/32: Introduce and use X86_BUG_ESPFIX instead of paravirt_enabled
uprobes: __create_xol_area() must nullify xol_mapping.fault
x86/cpufeature: Create a new synthetic cpu capability for machine check recovery
...
Diffstat (limited to 'tools/testing/selftests/x86/check_initial_reg_state.c')
-rw-r--r-- | tools/testing/selftests/x86/check_initial_reg_state.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/tools/testing/selftests/x86/check_initial_reg_state.c b/tools/testing/selftests/x86/check_initial_reg_state.c new file mode 100644 index 0000000..6aaed9b --- /dev/null +++ b/tools/testing/selftests/x86/check_initial_reg_state.c @@ -0,0 +1,109 @@ +/* + * check_initial_reg_state.c - check that execve sets the correct state + * Copyright (c) 2014-2016 Andrew Lutomirski + * + * This program is free software; you can redistribute it and/or modify + * it under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + */ + +#define _GNU_SOURCE + +#include <stdio.h> + +unsigned long ax, bx, cx, dx, si, di, bp, sp, flags; +unsigned long r8, r9, r10, r11, r12, r13, r14, r15; + +asm ( + ".pushsection .text\n\t" + ".type real_start, @function\n\t" + ".global real_start\n\t" + "real_start:\n\t" +#ifdef __x86_64__ + "mov %rax, ax\n\t" + "mov %rbx, bx\n\t" + "mov %rcx, cx\n\t" + "mov %rdx, dx\n\t" + "mov %rsi, si\n\t" + "mov %rdi, di\n\t" + "mov %rbp, bp\n\t" + "mov %rsp, sp\n\t" + "mov %r8, r8\n\t" + "mov %r9, r9\n\t" + "mov %r10, r10\n\t" + "mov %r11, r11\n\t" + "mov %r12, r12\n\t" + "mov %r13, r13\n\t" + "mov %r14, r14\n\t" + "mov %r15, r15\n\t" + "pushfq\n\t" + "popq flags\n\t" +#else + "mov %eax, ax\n\t" + "mov %ebx, bx\n\t" + "mov %ecx, cx\n\t" + "mov %edx, dx\n\t" + "mov %esi, si\n\t" + "mov %edi, di\n\t" + "mov %ebp, bp\n\t" + "mov %esp, sp\n\t" + "pushfl\n\t" + "popl flags\n\t" +#endif + "jmp _start\n\t" + ".size real_start, . - real_start\n\t" + ".popsection"); + +int main() +{ + int nerrs = 0; + + if (sp == 0) { + printf("[FAIL]\tTest was built incorrectly\n"); + return 1; + } + + if (ax || bx || cx || dx || si || di || bp +#ifdef __x86_64__ + || r8 || r9 || r10 || r11 || r12 || r13 || r14 || r15 +#endif + ) { + printf("[FAIL]\tAll GPRs except SP should be 0\n"); +#define SHOW(x) printf("\t" #x " = 0x%lx\n", x); + SHOW(ax); + SHOW(bx); + SHOW(cx); + SHOW(dx); + SHOW(si); + SHOW(di); + SHOW(bp); + SHOW(sp); +#ifdef __x86_64__ + SHOW(r8); + SHOW(r9); + SHOW(r10); + SHOW(r11); + SHOW(r12); + SHOW(r13); + SHOW(r14); + SHOW(r15); +#endif + nerrs++; + } else { + printf("[OK]\tAll GPRs except SP are 0\n"); + } + + if (flags != 0x202) { + printf("[FAIL]\tFLAGS is 0x%lx, but it should be 0x202\n", flags); + nerrs++; + } else { + printf("[OK]\tFLAGS is 0x202\n"); + } + + return nerrs ? 1 : 0; +} |