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Alex
2022-11-18 06:46:43 +02:00
parent 1a6665fd67
commit fa921fe626
2 changed files with 47 additions and 3 deletions
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40
Architecture/amd64/cpu/InterruptDescriptorTable.cpp
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@ -37,7 +37,15 @@ namespace InterruptDescriptorTable
extern "C" __attribute__((naked, used, no_stack_protector)) void ExceptionHandlerStub()
{
asm("cld\n" // clear direction flag
asm(
// "cmp $0x1000, %rsp\n" // Just in case the stack is corrupted
// "jng .skip_swap_check_1\n" /* if is not greater than */
// "cmpw $0x8, 0x8(%rsp)\n"
// "je .skip_swap_check_1\n"
// "swapgs\n"
// ".skip_swap_check_1:\n"
"cld\n" // clear direction flag
// push all registers
"pushq %rax\n"
@ -77,12 +85,31 @@ namespace InterruptDescriptorTable
"popq %rax\n"
"addq $16, %rsp\n"
// "cmp $0x1000, %rsp\n"
// "jng .skip_swap_check_2\n"
// "cmpw $0x8, 0x8(%rsp)\n"
// "je .skip_swap_check_2\n"
// "swapgs\n"
// ".skip_swap_check_2:\n"
"iretq"); // pop CS RIP RFLAGS SS ESP
}
extern "C" void WarnSwapgs() { warn("swapgs"); }
extern "C" __attribute__((naked, used, no_stack_protector)) void InterruptHandlerStub()
{
asm("cld\n"
asm(
// "cmp $0x1000, %rsp\n"
// "jng .skip_swap_check__1\n"
// "cmpw $0x8, 0x8(%rsp)\n"
// "je .skip_swap_check__1\n"
// "swapgs\n"
// "call WarnSwapgs\n"
// ".skip_swap_check__1:\n"
"cld\n"
"pushq %rax\n"
"pushq %rbx\n"
"pushq %rcx\n"
@ -119,6 +146,15 @@ namespace InterruptDescriptorTable
"popq %rax\n"
"addq $16, %rsp\n"
// "cmp $0x1000, %rsp\n"
// "jng .skip_swap_check__2\n"
// "cmpw $0x8, 0x8(%rsp)\n"
// "je .skip_swap_check__2\n"
// "call WarnSwapgs\n"
// "swapgs\n"
// ".skip_swap_check__2:\n"
"iretq");
}