| 1 | #include <cinttypes> |
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| 2 | #include <cstdint> |
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| 3 | #include <cstdio> |
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| 4 | |
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| 5 | int main() { |
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| 6 | constexpr uint32_t fill = 0x0F0F0F0F; |
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| 7 | |
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| 8 | uint32_t eax, ebx, ecx, edx, esi, edi; |
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| 9 | // need to use 64-bit types due to bug in clang |
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| 10 | // https://bugs.llvm.org/show_bug.cgi?id=41748 |
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| 11 | uint64_t esp, ebp; |
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| 12 | |
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| 13 | asm volatile( |
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| 14 | // save esp & ebp |
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| 15 | "movd %%esp, %%mm0\n\t" |
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| 16 | "movd %%ebp, %%mm1\n\t" |
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| 17 | "\n\t" |
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| 18 | "movl %8, %%eax\n\t" |
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| 19 | "movl %8, %%ebx\n\t" |
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| 20 | "movl %8, %%ecx\n\t" |
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| 21 | "movl %8, %%edx\n\t" |
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| 22 | "movl %8, %%esp\n\t" |
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| 23 | "movl %8, %%ebp\n\t" |
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| 24 | "movl %8, %%esi\n\t" |
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| 25 | "movl %8, %%edi\n\t" |
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| 26 | "\n\t" |
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| 27 | "int3\n\t" |
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| 28 | "\n\t" |
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| 29 | // copy new values of esp & ebp |
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| 30 | "movd %%esp, %4\n\t" |
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| 31 | "movd %%ebp, %5\n\t" |
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| 32 | // restore saved esp & ebp |
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| 33 | "movd %%mm0, %%esp\n\t" |
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| 34 | "movd %%mm1, %%ebp\n\t" |
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| 35 | : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx), "=y" (esp), "=y" (ebp), |
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| 36 | "=S" (esi), "=D" (edi) |
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| 37 | : "i" (fill) |
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| 38 | : "%mm0" , "%mm1" |
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| 39 | ); |
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| 40 | |
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| 41 | printf(format: "eax = 0x%08" PRIx32 "\n" , eax); |
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| 42 | printf(format: "ebx = 0x%08" PRIx32 "\n" , ebx); |
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| 43 | printf(format: "ecx = 0x%08" PRIx32 "\n" , ecx); |
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| 44 | printf(format: "edx = 0x%08" PRIx32 "\n" , edx); |
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| 45 | printf(format: "esp = 0x%08" PRIx32 "\n" , static_cast<uint32_t>(esp)); |
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| 46 | printf(format: "ebp = 0x%08" PRIx32 "\n" , static_cast<uint32_t>(ebp)); |
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| 47 | printf(format: "esi = 0x%08" PRIx32 "\n" , esi); |
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| 48 | printf(format: "edi = 0x%08" PRIx32 "\n" , edi); |
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| 49 | |
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| 50 | return 0; |
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| 51 | } |
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| 52 | |
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