diff options
Diffstat (limited to 'executor')
| -rw-r--r-- | executor/common_kvm_amd64_syzos.h | 30 |
1 files changed, 16 insertions, 14 deletions
diff --git a/executor/common_kvm_amd64_syzos.h b/executor/common_kvm_amd64_syzos.h index 828cdebff..32e09e0ba 100644 --- a/executor/common_kvm_amd64_syzos.h +++ b/executor/common_kvm_amd64_syzos.h @@ -185,29 +185,31 @@ GUEST_CODE static noinline void guest_handle_rdmsr(uint64 reg) GUEST_CODE static noinline void guest_handle_wr_crn(struct api_call_2* cmd) { uint64 value = cmd->args[1]; - switch (cmd->args[0]) { - case 0: + // Prevent the compiler from generating a switch table. + volatile uint64 reg = cmd->args[0]; + if (reg == 0) { // Move value to CR0. asm volatile("movq %0, %%cr0" ::"r"(value) : "memory"); - break; - case 2: + return; + } + if (reg == 2) { // Move value to CR2. asm volatile("movq %0, %%cr2" ::"r"(value) : "memory"); - break; - case 3: + return; + } + if (reg == 3) { // Move value to CR3. asm volatile("movq %0, %%cr3" ::"r"(value) : "memory"); - break; - case 4: + return; + } + if (reg == 4) { // Move value to CR4. asm volatile("movq %0, %%cr4" ::"r"(value) : "memory"); - break; - case 8: + return; + } + if (reg == 8) { // Move value to CR8 (TPR - Task Priority Register). asm volatile("movq %0, %%cr8" ::"r"(value) : "memory"); - break; - default: - // Do nothing. - break; + return; } } |